|
|
Coil Connection Newsletter – Winter 2010
Newsletter
Colmac Coil and Baltimore Aircoil Establish Strategic Alliance, Olberding Promoted to Sales Manager, Colmac Introduces DX Ammonia With "SHG" Defrost, Colmac Announces CE(PED) Certification for Industrial Refrigeration Coils
» View Newsletter
|
Coil Connection Newsletter – Fall 2008
Newsletter
Another Revolutionary Innovation from Colmac
» View Newsletter
|
Coil Connection Newsletter – Summer 2007
Newsletter
Colmac Receives Prestigious Award for 2007
» View Newsletter
|
Brochure: Custom Engineered Solutions from The Heat Transfer Experts
Product Flyer
» View Product Flyer
|
The Aluminum Advantage
Technical Bulletin
Comparing Aluminum vs. Galvanized Steel Ammonia Evaporators
» View Technical Bulletin
|
Anti-Microbial Heat Exchanger Fin Construction
Technical Bulletin
Extended surface compact heat exchangers have been used for several decades to heat and cool air in
» View Technical Bulletin
|
Back to Basics: Psychrometrics and the Psychrometric Chart
Technical Bulletin
An understanding of psychrometrics and use of the psychrometric chart is essential to the process of designing thermal systems and sizing the coils that are part of these systems. Whatever the type of coil, the air stream going through it can be plotted on the psychrometric chart, and important information learned about the air stream. With this knowledge, a designer can answer questions and make decisions during the coil selection process. This article will cover some of the basic principles and concepts of using the psychrometric chart.
» View Technical Bulletin
|
Back to Basics: Useful Equations When Sizing Coils With CoilPro
Technical Bulletin
There are several equations that can be used in conjunction with the Colmac "CoilPRO" selection software program to speed the process of sizing coils. Following is a listing of several of these equations, a description of where they come from, and examples of how they are used.
» View Technical Bulletin
|
Circuiting "Rules of Thumb"
Technical Bulletin
Circuiting coils can be intimidating to the novice, but is really not as difficult as it may seem. It is important to understand circuiting because coil performance and life can be dramatically affected by it. Often feeds, passes, and dropped tubes are used to describe circuiting. Just what does it all mean?
» View Technical Bulletin
|
Coil Corrosion By Erosion
Technical Bulletin
For the coil designer, coil corrosion can seem to be one of life's great mysteries. Combinations of metals in coil construction along with wide variations in operating environments can make the mechanisms of corrosion complex to say the least. When movement of a corrodent over a metal surface (i.e. through coil tubes) increases the rate of attack due to mechanical wear and corrosion, the attack is called Erosion Corrosion, and is considered a "localized" form of corrosion. Failure of water coils due to erosion of tube surfaces can many times be avoided with proper coil design.
» View Technical Bulletin
|
Cold Weather Steam Coil Design
Technical Bulletin
Of all the different types of coils Colmac produces (water, steam, evaporators, condensers), steam coils seem to be the most challenging in terms of proper design and application. During cold winter months the possibility exists for preheat steam coils exposed to outdoor air to freeze and burst, or experience severe water hammer leading to failure. This scenario can be avoided if preheat coils are correctly designed, piped, and trapped.
» View Technical Bulletin
|
Designing Air Coolers For Direct Expansion (DX) With Ammonia
Technical Bulletin
Ammonia is a commonly used refrigerant in industrial refrigeration systems. Unlike HCFC's and HFC's (i.e. R22, R134a) ammonia can truly be called a "Natural Refrigerant" because it occurs in nature and is therefore environmentally benign. Ammonia is widely used in industry and agriculture, is low cost, and has excellent heat transfer characteristics.
» View Technical Bulletin
|
Determining Defrost Water Volume
Technical Bulletin
Refrigerated warehouses and food processing facilities typically use cooling coils to cool air as it is circulated in the refrigerated space. Air is made up of a mixture of gases, mainly nitrogen, oxygen, carbon dioxide, and water vapor.
» View Technical Bulletin
|
Colmac Introduces DX Ammonia With Smart Hot Gas 'SHG' Defrost (Patent Pending)
Technical Bulletin
In the past, the application of direct expansion (DX) in industrial ammonia refrigeration systems was limited to suction temperatures above 0F (-18C). Industrial ammonia systems operating at temperatures below 0F (-18C) have typically used liquid overfeed (pumped) or gravity flooded evaporator feed.
» View Technical Bulletin
|
Run-Around Coil Loop Heat Recovery
Technical Bulletin
With the recent increase in energy costs, heat recovery devices can offer lower utility payments and quick payback. One popular method of heat recovery is a run-around coil loop. A run around coil loop simply moves heat from one air stream to another via two heat exchangers and a heat transfer medium, usually water or glycol. A pump is required to move the medium through the system. Although there are several other methods of air-to-air heat recovery, a run around coil loop may be the only option when airstreams are not adjacent to each other.
» View Technical Bulletin
|
"The Stainless Advantage" Using Stainless Steel Tube/Aluminum Fin Construction in Ammonia Evaporators
Technical Bulletin
Air-cooling evaporators (“air coolers”) used in ammonia systems have traditionally been made using galvanized (zinc coated) carbon steel. There are other metals which exhibit excellent compatibility with ammonia, including stainless steel and aluminum.
» View Technical Bulletin
|
Successful Refrigeration Depends On Good Airflow
Technical Bulletin
Very often we forget that air is the most commonly used heat transfer fluid in air-conditioning and refrigeration systems. We typically remove heat from a refrigerated space by circulating cooled air throughout the room and across the product being refrigerated. A good airflow pattern is critical to the success of any refrigerated space design. A poor airflow pattern will result in poor air cooler and system performance even though the equipment may be adequately sized for the cooling load.
» View Technical Bulletin
|
Value Engineering a Coil Replacement
Technical Bulletin
We are often called upon by our customers to visit a jobsite and measure an old coil for replacement. Instead of simply replacing the coil in kind, try adding some value by taking a technical approach and perhaps solving a problem for your customer.
» View Technical Bulletin
|
Water Defrosting At Freezer Temperatures
Technical Bulletin
The following guidelines should be used when designing water defrost systems for low temperature freezer applications.
» View Technical Bulletin
|
|
|
