Showing posts with label HVAC. Show all posts
Showing posts with label HVAC. Show all posts

Friday, August 31, 2018

What is a Cooling Tower?

An evaporative cooling tower is heat removal device that uses ordinary water to transfer process waste heat from building and equipment into the atmosphere. All cooling towers operate on the principle of removing heat from water by evaporating a small portion of water that is recirculated through the unit.

The mixing of warm water and cooler air releases latent heat of vaporization, causing a cooling effect to the water.  Cooling towers are a key component of many refrigeration systems and can be found in industries such as chemical processing plants, power plants, steel mills, food processing plants, and many other manufacturing companies where process cooling is required.  Cooling towers are also used to provide comfort cooling for large commercial buildings such as universities, government facilities, airports, schools, hospitals, and hotels.

The video below provides a short review of what cooling towers are and why they are important.

Thursday, January 18, 2018

Corrosion Resistant Cooling Towers

corrosion resistant HDPE cooling tower
One variant of corrosion resistant cooling tower
Image courtesy Delta Cooling Towers
Cooling towers rank highly as included components of heat rejection systems. Building and facility HVAC and industrial process cooling commonly rely on cooling towers as the final phase of transferring heat from inside a system, such as a building, to the outdoor environment. With most relying on the evaporation of water as the means to efficiently move large amounts of heat, cooling towers contain large wetted surfaces in almost continuous contact with solutions of water and various chemicals used to maintain certain fluid conditions. The heat transfer solutions can be aggressive, and many towers are constructed using metal for the wetted parts and case of the unit. This has traditionally been an area of concern with cooling tower ownership, since the combined elements of water, treatment chemicals, and time take their inevitable toll on the equipment.

Avoiding the deterioration of metal clad cooling towers is construction utilizing high-density polyethylene (HDPE). HDPE is not impacted by water, treatment chemicals, or elements often present in the air, whether harsh chemical vapors emitted from nearby industrial plants or natural corrosives such as salt air.

Delta Cooling Towers, Inc., based in New Jersey, USA, manufactures HDPE cooling towers and possesses an extensive portfolio of completed successful applications utilizing HDPE construction features. Below is a short case study showing how one industrial user benefited from installing HDPE cooling towers.

Read the case study and get more information from an application specialist. See how incorporating HDPE cooling towers into your operation can reduce maintenance burden and lead to longer machinery life.

In any business venture or other organization, relying on doing things the way they have always been done can be detrimental to real progress and improvement. Incorporating change involves risk, but good planning and careful analysis will increase the probability of success.

Thursday, November 16, 2017

Forced Draft Cooling Tower With 20 Year Warranty

corrosion resistant HDPE cooling tower rated 50 tons with forced draft
Forced draft corrosion resistant cooling tower
with forced draft, rated 50 tons. Pioneer series.
Image courtesy Delta Cooling Towers
Delta Cooling Towers specializes in the design and construction of corrosion resistant cooling towers and similar equipment. Much of the tower construction is HDPE or other non-metallic material, enabling the company to offer a 20 year warranty on their equipment.

Cooling towers are employed worldwide in HVAC applications and process fluid cooling. In addition to their industry leading corrosion resistance, Delta Cooling Towers also offers anti-microbial protection which combats the growth of microbes responsible for Legionnaires Disease and other respiratory ailments. The various product lines cover heat transfer capacities to accommodate any installation.

There is a lexicon employed in the description of cooling tower performance and operation. Some commonly used terms, along with their meaning, is provided below. The terms and their meanings is pulled from the owner's manual provided by Delta Cooling Towers for their Pioneer series of forced draft cooling towers.

Share your process and HVAC cooling challenges with application experts, leveraging your own knowledge and experience with their product application expertise to develop an effective solution.

Cooling Tower Terms and Definitions

  • BTU - A BTU is the heat energy required to raise the temperature of one pound of water one degree Fahrenheit in the range from 32° F. to 212° F.
  • Cooling Range - The difference in temperature between the hot water entering the tower and the cold water leaving the tower is the cooling range.
  • Approach - The difference between the temperature of the cold water leaving the tower and the wet-bulb temperature of the air is known as the approach. The approach fixes the operating temperature of the tower and is a most important parameter in determining both tower size and cost.
  • Drift - The water entrained in the air flow and discharged to the atmosphere. Drift loss does not include water lost by evaporation. Proper tower design and operation can minimize drift loss.
  • Heat Load - The amount of heat to be removed from the circulating water through the tower. Heat load is equal to water circulation rate (gpm) times the cooling range times 500 and is expressed in BTU/hr. Heat load is also an important parameter in determining tower size and cost.
  • Ton - An evaporative cooling ton is 15,000 BTU's per hour.
  • Wet-Bulb Temperature - The lowest temperature that water theoretically can reach by evaporation. Wet-Bulb Temperature is an extremely important parameter in tower selection and design and should be measured by a psychrometer.
  • Pumping Head - The pressure required to pump the water from the tower basin, through the entire system and return to the top of the tower.
  • Make-Up - The amount of water required to replace normal losses caused by bleedoff, drift, and evaporation.
  • Bleed Off (Blowdown) - The circulating water in the tower which is discharged to waste to help keep the dissolved solids concentrating in the water below a maximum allowable limit. As a result of evaporation, dissolved solids concentration will continually increase unless reduced by bleed off.

Friday, October 20, 2017

Wet Bulb Temperature and Cooling Tower Performance

corrosion resistant cooling tower induced draft type
Corrosion resistant evaporative cooling tower
Image courtesy Delta Cooling Towers, Inc.
Evaporative cooling towers enable many buildings across the globe to enjoy moderate interior temperatures. They serve as the final heat transfer step that moves heat from the building interior to the surrounding environment. In addition to their extensive application throughout large residential, commercial and industrial HVAC systems, their are numerous process cooling applications that employ evaporative cooling towers as an effective means of heat rejection.

Delta Cooling Towers, Inc. is a globally recognized manufacturer of corrosion resistant cooling towers, air strippers and tanks fabricated of HDPE to provide extended life service. The company posted an article entitled "Understanding Wet Bulb Temperatures And How It Affects Cooling Tower Performance". The original post is on this page of the company website, and all credit for the article goes to them. We share it below also, slightly edited for format on this forum.  From the article...

A cooling tower primarily uses latent heat of vaporization (evaporation) to cool process water. Minor additional cooling is provided by the air because of its temperature increase. Cooling tower selection and performance is based on water flow rate, water inlet temperature, water outlet temperature and ambient wet bulb temperature. Ambient wet bulb temperature and its affect on performance is the subject of this article. Ambient wet bulb temperature is a condition measured by a device called a psychrometer. A psychrometer places a thin film of water on the bulb of thermometer that is twirled in the air. After about a minute, the thermometer will show a reduced temperature. The low point when no additional twirling reduces the temperature is called the wet bulb temperature. The measured wet bulb temperature is a function of relative humidity and ambient air temperature. Wet bulb temperature essentially measures how much water vapor the atmosphere can hold at current weather conditions. A lower wet bulb temperature means the air is drier and can hold more water vapor than it can at a higher wet bulb temperature. For example:
Since cooling tower cells cool water by evaporation, the wet bulb temperature is the critical design variable. An evaporative cooling tower can generally provide cooling water 5° - 7° higher above the current ambient wet bulb condition. That means that if the wet bulb temperature is 78°F, then the cooling tower will most likely provide cooling water between 83° - 85°F, no lower. The same tower cell, on a day when the wet bulb temperature is 68°F, is likely to provide 74° - 76°F cooling water. When selecting a cooling tower cell, the highest or the design wet bulb temperature your geographical area will encounter must be used. Highest wet bulb temperatures occur during the summer, when air temperatures and humidity is highest. For example, in Indianapolis, Indiana, the design wet bulb temperature is 78°F. Historically Indianapolis can expect less than one hour per year that the conditions exceed a 78°F wet bulb. Typically, 6,000 hours a year will have a wet bulb of 60°F or lower meaning that a cooling tower cell designed for a 78°F wet bulb will be able to make 65-67°F water for 6,000 hours per year nearly 70% of the year. Most cooling towers are capacity rated at a "standard" wet bulb temperature of 78°F. That means on the days when the wet bulb temperature is 78°F, the tower will produce its stated capacity. In other words, a tower rated to produce 135 tons of cooling will produce 135 tons of cooling at a 78°F wet bulb temperature. At a higher wet bulb temperature, the tower cell capacity to produce colder water decreases. Every location has a unique design (worst case) wet bulb temperature that is published by organizations such as ASHRAE and can be obtained easily.

What does it mean when your cooling tower water temperature is higher than the normal 5-7°F above the current wet bulb temperature?

  1. Your cooling load may be larger than the rated capacity of your cooling tower.
  2. Your cooling tower may have lost efficiency
  • Due to scale build up on the tower heat exchange surfaces.
  • Due to loss of air flow across the heat exchange surfaces.
  • Due to improper water flow from clogged nozzles or pump performance
What can you do to improve your tower performance? 

  • Add tower cell capacity
  • Check for the efficiency losses described above
  • Replace the heat exchange surfaces with new clean fill
  • Check for proper airflow
  • Check the water flow is at design
  • Check that nozzles are not clogged or broken

Cooling tower performance is tied to ambient wet bulb conditions. Higher wet bulb temperatures occur in the summer when higher ambient and relative humidity occurs. Initial system design and proper system maintenance is critical to be certain your cooling tower is providing desired cooling.

For more information, or to discuss your own heat transfer challenges, contact a product application specialist. Combine your own knowledge and experience with their application expertise to develop an effective solution.

Wednesday, August 23, 2017

Cooling Towers: Operating Principles and Systems

evaporative cooling tower made of HDPE plastic
Example of evaporative cooling tower, fabricated
from HDPE plastic to resist corrosion.
Image courtesy Delta Cooling Towers
The huge, perfectly shaped cylindrical towers stand tall amidst a landscape, with vapor billowing from their spherical, open tops into the blue sky. Such an image usually provokes a thought related to nuclear power or a mysterious energy inaccessible to the millions of people who drive by power plants every day. In reality, cooling towers – whether the hyperboloid structures most often associated with the aforementioned nuclear power plants or their less elegantly shaped cousins – are essential, process oriented tools that serve as the final step in removing heat from a process or facility. The cooling towers at power plants serve as both an adjuster of a control variable essential to the process and also as a fascinating component of the process behind power creation. The importance and applicability of cooling towers is extensive, making them fundamentally useful for industrial operations in power generation, oil refining, petrochemical plants, commercial/industrial HVAC, and process cooling.

In principle, an evaporative cooling tower involves the movement of a fluid, usually water with some added chemicals, through a series of parts or sections to eventually result in the reduction of its heat content and temperature. Liquid heated by the process operation is pumped through pipes to reach the tower, and then gets sprayed through nozzles or other distribution means onto the ‘fill’ of the tower, reducing the velocity of the liquid to increase the fluid dwell time in the fill area. The fill area is designed to maximize the liquid surface area, increasing contact between water and air. Electric motor driven fans force air into the tower and across the fill area. As air passes across the liquid surface, a portion of the water evaporates, transferring heat from the water to the air and reducing in the water temperature. The cooled water is then collected and pumped back to the process-related equipment allowing for the cycle to repeat. The process and associated dispersion of heat allows for the cooling tower to be classified as a heat rejection device, transferring waste heat from the process or operation to the atmosphere.

Evaporative cooling towers rely on outdoor air conditions being such that evaporation will occur at a rate sufficient to transfer the excess heat contained in the water solution. Analysis of the range of outdoor air conditions at the installation site is necessary to assure proper operation of the cooling tower throughout the year. Evaporative cooling towers are of an open loop design, with the fluid exposed to air.

A closed loop cooling tower, sometimes referred to as a fluid cooler, does not directly expose the heat transfer fluid to the air. The heat exchanger can take many forms, but a finned coil is common. A closed loop system will generally be less efficient that an open loop design because only sensible heat is recovered from the fluid in the closed loop system. A closed loop fluid cooler can be advantageous for smaller heat loads, or in facilities without sufficient technical staff to monitor or maintain operation of an evaporative cooling tower.

Thanks to their range of applications, cooling towers vary in size from the monolithic structures utilized by power plants to small rooftop units. Removing the heat from the water used in cooling systems allows for the recycling of the heat transfer fluid back to the process or equipment that is generating heat. This cycle of heat transfer enables heat generating processes to remain stable and secure. The cooling provided by an evaporative tower allows for the amount of supply water to be vastly lower than the amount which would be otherwise needed. No matter whether the cooling tower is small or large, the components of the tower must function as an integrated system to ensure both adequate performance and longevity. Understanding elements which drive performance - variable flow capability, potential HVAC ‘free cooling’, the splash type fill versus film type fill, drift eliminators, nozzles, fans, and driveshaft characteristics - is essential to the success of the cooling tower and its use in both industrial and commercial settings.

Design or selection of an evaporative cooling tower is an involved process, requiring examination and analysis of many facets. Share your heat transfer requirements and challenges with cooling tower specialists, combining your own facilities and process knowledge and experience with their application expertise to develop an effective solution.`

Wednesday, July 19, 2017

Integrated Solution for Chilled Water Coil Control

integrated sensors, controller, control valve, actuator for HVAC
Monitrol includes controller, sensors, control valve, and
actuator in a single integrated package.
Image courtesy of Warren Controls
The final control element used for heating or cooling via a heat transfer fluid is going to be a control valve, most often one capable of modulating the fluid flow by precise valve positioning. This control activity requires sensors, the control valve, a controller, and an actuator.

Selecting, installing, and coordinating the operation of these components can be challenging and time consuming, especially when the components are sourced from varied manufacturers. Warren Controls delivers a consolidated solution with their Monitrol line of control valves intended for heat transfer control tasks and related operations. The Monitrol concept involves combining pre-engineered and matched controllers and actuators with flow control valves equipped with built-in sensors for pressure, temperature, or flow. Measurement and control is performed locally, with communications between the local and central controllers exchanging setpoint and performance information. The solution is compact and simplified, enabling easy selection, installation, and startup.

More details are provided in the document included below. There are numerous product variants to accommodate a wide array of field applications. Share your fluid control and heat transfer requirements and challenges with an application expert, combining your own facility and process knowledge with their product application expertise to develop an effective solution.

Tuesday, June 20, 2017

Shell and Tube Heat Exchangers

large shell and tube heat exchangers at oil refinery
These shell and tube heat exchangers are at an oil refinery, but
their application crosses all industry boundaries.
Cars are something which exist as part of the backbone of modern society, for both personal and professional use. Automobiles, while being everyday objects, also contain systems which need to be constantly maintained and in-sequence to ensure the safety of both the machine and the driver. One of the most essential elements of car ownership is the understanding of how heat and temperature can impact a car’s operation. Likewise, regulating temperature in industrial operations, which is akin to controlling heat, is a key process control variable relating to both product excellence and operator safety. Since temperature is a fundamental aspect of both industrial and consumer life, heat management must be accurate, consistent, and predictable.

A common design of heat exchangers used in the oil refining and chemical processing industries is the shell and tube heat exchanger. A pressure vessel, the shell, contains a bundle of tubes. One fluid flows within the tubes while another floods the shell and contacts the outer tube surface. Heat energy conducts through the tube wall from the warmer to the cooler substance, completing the transfer of heat between the two distinct substances. These fluids can either be liquids or gases. If a large heat transfer area is utilized, consisting of greater tube surface area, many tubes or circuits of tubes can be used concurrently in order to maximize the transfer of heat. There are many considerations to take into account in regards to the design of shell and tube heat exchangers, such as tube diameter, circuiting of the tubes, tube wall thickness, shell and tube operating pressure requirements, and more. In parallel fashion to a process control system, every decision made in reference to designing and practically applying the correct heat exchanger depends on the factors present in both the materials being regulated and the industrial purpose for which the exchanger is going to be used.

The industrial and commercial applications of shell and tube heat exchangers are vast, ranging from small to very large capacities. They can serve as condensers, evaporators, heaters, or coolers. You will find them throughout almost every industry, and as a part of many large HVAC systems. Shell and tube heat exchangers, specifically, find applicability in many sub-industries related to food and beverage: brewery processes, juice, sauce, soup, syrup, oils, sugar, and others. Pure steam for WFI production is an application where special materials, like stainless steel, are employed for shell and tube units that transfer heat while maintaining isolation and purity of a highly controlled process fluid.

Shell and tube heat exchangers are rugged, efficient, and require little attention other than periodic inspection. Proper unit specification, selection, and installation contribute to longevity and solid performance. Share your project challenges with application experts, combining your own process and facilities knowledge with their product application expertise to develop effective solutions.

Wednesday, April 5, 2017

Closed Loop Cooling - Alternative Setup Delivers Benefits

Industrial processing often requires the transfer of heat, sometimes into the process, sometimes out of the process. External heat sources are often steam, hot water, or electric heaters. There are also instances where processing machinery either adds heat to the process or requires heat removal (cooling) in order to maintain proper function. If the heat source can accommodate a flowing liquid to provide removal of excess heat, it is a candidate for a closed loop cooling system.

One schematic for a closed loop cooling circuit would show the heat source connected to the piping system, with a pump for circulation and a finned coil located outdoors. The pump moves the heat transfer liquid through the hot area where heat moves from the process to the flowing liquid. The heated liquid continues to flow through the piping system to the finned coil, located outdoors. A fan moves air across the coil to provide heat transfer. The finned coil size would need to be comparatively large, since only sensible cooling using the forced air is employed. The fan capacity would be commensurate with the coil size and the circulating pump rating would be in line with the fluid moving requirements of the system. While this design is fairly simple, there may be a more efficient way to accomplish the heat transfer and deliver what may be beneficial additional features.

Consider a different schematic for the same application. This alternate design employs a closed loop cooling circuit for the heat source, but utilizes a different means of rejecting the heat from the closed loop to the outside air. A plate and frame heat exchanger transfers heat from the closed cooling loop to an open loop circuit that circulates through a cooling tower located outdoors. This scenario maintains the closed loop nature of the equipment cooling circuit, preventing entry of particulates or dissolved gases into the cooling fluid circulating through the process or machinery. Here is what the schematic looks like, courtesy of Delta Cooling Towers .
closed loop cooling system schematic with cooling tower
Closed loop cooling of process heat source using plat and frame heat exchanger and induced draft cooling tower
Courtesy Delta Cooling Towers
The cooling tower offers far greater efficiency than the fan and coil arrangement in the first design. Employing a plastic cooling tower will drastically reduce the life cycle cost over a galvanized steel model and the cooling tower will occupy significantly less space and require less costly support structure than the larger fan and coil arrangement. Total horsepower requirements for the system are reduced. The closed loop will not require any chemical additions for freeze protection because it no longer extends outdoors. This system also provides an element of flexibility, with expansion of the plate and frame heat exchanger a possibility. Cooling tower capacity is also expandable and available for other uses throughout the facility.

There are more details provided in the datasheet included below. Share your heat transfer and cooling challenges with application experts and explore various options. The combination of your process knowledge and experience with their product application expertise will produce an effective solution.

Wednesday, January 18, 2017

Mountain States Engineering and Controls Expands Product Offering

duplex condensate return pump with receiver tank and sight glass
Duplex condensate return pump
Courtesy Sterling Sterlco
Mountain States Engineering and Controls has added the Sterling Sterlco line of condensate pump, boiler feed pump, and temperature control valve products to round out its comprehensive offering of instruments and equipment for steam systems and process cooling.

The Sterlco condensate pumps are available in simplex or duplex configurations, with pump and receiver capacity ratings to accommodate a broad range of industrial and commercial applications. Option selections round out the flexible product specification.

Boiler feed pump units from Sterlco provide a similar extensive range of receiver and pump capacities, along with options to meet application specific requirements.

The Sterlco self powered modulating temperature control valves are available in eight sizes and provide regulation of coolant flow to a machine or process. Their simple design provides rugged temperature actuated performance in a wide array of cooling applications.

There is more to learn about Sterling Sterlco condensate pumps, temperature control valves, and boiler feed pumps. For the latest product information, or to work on a solution to your steam or cooling system challenges, reach out to an application expert and combine your facilities and process knowledge with their product application expertise to develop effective solutions.

Tuesday, September 20, 2016

Replacing Heat Exchanger Tube Bundles

heat exchangers outdoors at oil refinery
Heat exchangers of many sizes are used throughout industry
Heat, a well recognized energy component of countless industrial processes. Heat exchangers are employed to move or transfer heat between two media, and are available in a wide variety of designs and configurations. They are manufactured from materials and in forms to accommodate the specific performance requirements of each process, machine, or operation.

The shell and tube heat exchanger is one common type of this heat transfer device that can be found in many commercial buildings and industrial plants. The unit is comprised of a vessel, or shell, with an array of tubes contained within. One fluid will flood the shell, encompassing the tubes through which a second fluid passes. The contact between the fluid within the shell and the outer surface of the tubes facilitates the transfer of heat energy between the two media. Applications for shell and tube units typically involve two liquids or one liquid and steam. They are not suitable for applications involving air streams.

Eventually, all heat exchangers need either major overhaul or replacement. Tubes tend to deteriorate faster than the shell, so replacement of the tube bundle can breathe extra life into a heat exchanger. Original documentation provided with the unit, plus a physical inspection, should provide all the information needed to have a new tube bundle manufactured. Numerous sources are available for replacement tube bundles, with the original manufacturer being only one potential source.
The replacing of a heat exchanger is also a good time to examine the performance delivered by the existing unit. Was it a limiting factor in the operation of the process? If so, perhaps this may be an opportunity to build in some headroom. Whatever the case, recognize that bringing in a product specialist with experience and knowledge will provide the beneficial leverage you need to get the job done right and finished on time.

Tuesday, August 2, 2016

Corrosion Resistant Cooling Towers Allow Aggressive Water Treatment

cooling tower corrosion resistant plastic construction
Corrosion resistant cooling tower
Courtesy Delta Cooling Towers
Unless you are located in the northern or southern polar regions, churning away on the roof of the building in which you may work, or mounted on a pad adjacent to it, is likely an important unit of equipment. It is essential to climate control in the building, and possibly an integral heat rejection component for an industrial process. Yes, I am talking about cooling towers. While hardly glamorous, without their successful operation, much of your operation will grind to a halt. 

There is substantial cost involved in the operation of a cooling tower, including energy, water, treatment chemicals, and more. Corrosion and the accumulation of fouling material can measurably reduce overall cooling efficiency. Even modest accumulation can slash energy efficiency by 5%, increasing operating costs in a marked way.

Keeping a cooling tower operating near its design capacity requires a commitment to a regular maintenance and inspection schedule. When deficiencies are found, they should be corrected within a reasonably short time frame. Water treatment, to improve performance or reduce maintenance burden, can sometimes be overly aggressive and impart some negative side effects to the equipment. Plastic cooling towers provide a high level of resistance to even the most aggressive water treatment chemicals. Cooling towers fabricated from plastics can carry warranties extending to 20 years.

Water cooling towers are an important operational component of your infrastructure, as well as a significant continuing cost center. They should be cared for as an important appliance. Avoid choosing a "Run to failure" maintenance program.

There is much to consider when adding or replacing a cooling tower. Share your project requirements and challenges with an application specialist. Combining your process and operational expertise with their product application knowledge will produce an effective solution.

Friday, April 29, 2016

Simple BTU Metering For Commercial and Industrial Applications

Illustration of simple BTU metering system showing components
Simple BTU metering setup for closed loop heating or
cooling system
Monitoring thermal energy usage at logical or localized points of consumption can provide a manager some insight into the real costs of process or space operation, as well as where the greatest benefits may be reaped from efforts at maximizing energy efficiency.

Heating and cooling systems or loops that employ water as the heat transfer medium can be simply and economically metered to determine the thermal energy usage of a space or process. The simple setup consists of a flow meter, two temperature sensors, and a calculating module that collects the output from all three devices and produces a summation of the total heat transferred through the system portion served by the subject piping. This arrangement is commonly called BTU Metering.

The size of the system being metered may be an important factor in determining the most effective metering equipment specification. A larger capacity fluid system is likely to benefit from highly accurate measurement equipment, since inaccuracy in temperature or flow measurement is leveraged by the large amount of liquid moving through the system. Heating or cooling systems of small or moderate size tend to be well suited for the application of moderate to good accuracy metering equipment, with its substantially reduced cost of installation and ownership. The key to success is selecting equipment that is well applied for the whole range of anticipated flow rates and temperatures.

If your building, plant, or process currently does not have any thermal metering, the installation of this simple device can provide information that assists in making significant progress in building an energy saving plan. More information is available from product application specialists, as well as consultation on how to most economically accomplish your process energy metering goals. Share your process measurement and control challenges with a product specialist and work together to develop effective and sensible solutions.

Tuesday, January 19, 2016

Delta Cooling Towers - News Update

AHR Expo announcement for Delta Cooling Towers
Delta Cooling Towers
Exhibiting at AHR Expo 2016
Delta Cooling Towers manufactures corrosion resistant cooling towers for commercial and industrial applications where these product features are important:
  • Seamless double wall engineered plastic (HDPE) shell
  • Corrosion proof construction
  • Direct drive fan system
  • Totally enclosed VFD rated motors
  • Factory assembled for simple installation
  • 20 Year shell warranty
  • PVC water distribution system with non-clog large orifice removable nozzles
  • High efficiency PVC fill
  • Made in the USA
Mountain States Engineering and Controls (MSEC) represents the manufacturer in Colorado, Wyoming, and Montana You can visit the Delta Cooling Towers booth at AHR Expo January 25 - 27 in Orlando, Florida. 

Corrosion resistant cooling tower for HVAC or industrial cooling
HDPE Cooling Tower
Courtesy Delta Cooling Towers

Tuesday, December 1, 2015

Cooling Tower Case Study: HDPE vs. Metal Clad

HDPE constructed cooling tower
HDPE Constructed Cooling Tower
Courtesy Delta Cooling Towers
In any business venture or other organization, relying on doing things the way they have always been done can be detrimental to real progress and improvement. Certainly, incorporating change has risk, but careful consideration and planning can make deciding upon and implementing change a big win for an organization.

Cooling towers are common elements of heat rejection systems, like building HVAC and industrial process cooling. By design, cooling towers have large wetted surfaces in almost continuous contact with aggressive solutions of water and various chemicals used to maintain certain fluid conditions. Many towers are constructed using metal for the wetted parts and case of the unit. This has traditionally been an area of concern with cooling tower ownership, since the combined elements of water, treatment chemicals, and time take their inevitable toll on the equipment.

There is a good solution to the deterioration of metal clad cooling towers. Construction utilizing high-density polyethylene (HDPE). HDPE is impervious to corrosive water treatment chemicals and elements often present in the air, whether harsh chemical vapors emitted from nearby industrial plants or natural corrosives such as salt air.

Delta Cooling Towers, Inc. is a US based manufacturer of HDPE cooling towers with a substantial portfolio of completed projects. Below is a short case study showing how one industrial user benefited from installing HDPE cooling towers.

Read the case study and get more information from an application specialist. See how incorporating HDPE cooling towers into your operation can reduce maintenance burden and lead to longer machinery life.

Tuesday, November 10, 2015

Pipeline Strainers: Proper Selection and Application

Pipeline Basket Strainer Cutaway View
Basket Strainer
Courtesy Spirax Sarco
Pipeline strainers are one of those simple devices that perform a critical role in maintaining the smooth operation of any piping system. They are found in any operation that has fluid moving through a pipe, and their proper selection and application is the subject of a great tutorial authored by the experts at Spirax Sarco, a premiere manufacturer of specialties for industrial piping systems.

One of the basic tenets of industrial process control operations is to maintain a specified function or outcome, to keep things working. Reduced to its simplest, the function of a strainer is to trap materials flowing in the pipeline that should not be there. Rust, scale, joint compound, and particulate materials can impact the function of valves and other elements in the system. A strainer will trap and hold undesirable material, for removal at a later time.

The attached article is excerpted from the company's extensive tutorial library, which you can access by contacting an application specialist. That same application specialist can provide additional detail at any level you need, as well as work with you to meet application challenges and improve your industrial or commercial operations.

Monday, October 5, 2015

Cooling Tower Corrosion Resistance - It's Easy

Corrosion resistant cooling tower installation
Corrosion resistant cooling tower
Courtesy Delta Cooling Towers
Machinery that will be continuously bathed in a spray of water throughout its operating life is certainly a good candidate for some corrosion protection. Locate this equipment outdoors, perhaps in a coastal area, and the potential to gain benefits from a corrosion resistant installation are more than clear.

Cooling towers fit my previous description admirably, and their scope of application makes them an essential element of facility operation. Every unit is exposed to combined effects of variable water chemistry, constant saturation at elevated temperatures, and aeration. Some cooling towers also are impacted by potentially harmful agents in the process water and various airborne pollutants, including sulfur oxides and acid rain.

For those not entirely familiar with how a cooling tower works, here are the very basics. Cooling towers transfer an amount of heat from one or more water-cooled machines or systems to outdoor air. Heated water from the water cooled systems enters the cooling tower, distributes over a heat transfer surface (sometimes called the fill), and is cooled by an induced air flow that is forced through the fill. The flowing air causes a portion of the water to evaporate, removing heat and lowering the temperature of the water. The cooled water is collected in a basin and returned to the system to repeat the heat transfer cycle.

Traditionally, cooling towers were fabricated of metal because of its structural strength and ability to be formed using readily available fabricating means. Differing metals were employed, at basic to premium price points, to provide increased levels of resistance to the ever present corroding nature of water and weather. Many cooling towers built today employ the same, or similar, materials and methods used decades ago. There is, and has been for quite some time now, a modern alternative to metal cooling tower construction that provides substantially increased levels of corrosion resistance at a competitive price point.

Delta Cooling Towers, Inc. manufactures cooling towers using structural and other plastics, enabling them to provide a 20 year warranty covering the basic structure of the unit. The product line provides capacity and performance range to cover almost any requirement. If you are in the business of specifying heat rejection equipment for your own facility, or one of your client's, you should get more detailed information about this equipment. Have a discussion about your application requirements, and concerns about operational longevity, with a product specialist. Good decisions come from combining the knowledge and experience of many.

As a quick reference, included below is a list of materials used in the construction of the Delta Cooling Towers unit. A quick glance by anyone familiar with the corrosion susceptibility of metals used in tower construction will see that the superior performance of the plastic materials should be given serious consideration on a cooling tower project.

Tuesday, February 24, 2015

Applying Cooling Towers

Delta Cooling Tower
Delta Cooling Tower
Here is a presentation that explains how to apply cooling towers, including the basic cooling tower principles, design considerations, and construction issues.

The original presentation given in 2009 by Steve Lowe, PE to the Hampton Roads, VA Chapter of ASHRAE.

For more information on any cooling tower issue in Colorado, New Mexico, Wyoming, Montana, Utah, Nevada, Idaho, or the western Dakotas, contact:

Mountain States Engineering and Controls
1520 Iris Street
Lakewood, CO 80215
303.232.4100 Phone
303.232.4900 Fax