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Heating & Cooling Coils - Refrigeration

Aplusp Interior Websize
Engine Room
Offshore platform
  • Tube Materials: 304 or 316 Stainless Steel
  • Fin Materials: Aluminum, Epoxy Coated Aluminum, Copper, Cupronickel, Stainless Steel
  • Corrosion Resistant Coatings Available


  • ASME
  • UL
  • CRN


Colmac can supply condenser coils for any refrigerant and condensing temperature. Industrial refrigeration systems using ammonia (R717), CO2 carbon dioxide (R744), and hydrocarbons such as R290 (propane), R600 (isobutane), R1270 (propylene), can be operated using air-cooled condensing. Our selection software allows design and selection of condenser coils having either complete or partial condensing (heat recovery). Condenser coils for marine duty are available with special epoxy coated fins and 316 stainless steel construction to resist corrosion by salt spray. Colmac specialized in these marine duty condenser coils for offshore oil platforms and seagoing vessels. Air-cooled steam (R718) condensing coils are also available for Rankine cycle-based systems. Condenser coils used in Organic Rankine Cycle (ORC) machines using R245fa refrigerant can also be designed using CoilPro software. Headers and tubesheets are designed to allow the coil block to float in the coil tubesheets, limiting the possibility of refrigerant leaks.   


Desuperheating refrigerant discharge gas using a coil designed by Colmac for this purpose can produce heated air which can be used for high temperature heating and drying in industrial processes.         

Supercritical Gas Cooler

The refrigeration cycle most of us know and love rejects the heat of compression at temperatures below the critical point of the refrigerant, this is termed "subcritical". This mode of operation approximates the Carnot cycle which is highly energy efficient. Air-cooled refrigeration systems using carbon dioxide (CO2, R744) as the refrigerant will operate with the compressor discharge pressure above the critical point whenever the ambient temperature rises above the critical temperature of CO2 (88 deg F, 31 deg C). The refrigeration cycle no longer approximates the Carnot cycle and is termed "transcritical". Transcritical cycles are less energy efficient compared to subcritical cycles operating with the same temperature lift. In the transcritical case the CO2 discharge gas is in the supercritical condition and what was once a condenser is now called a supercritical gas cooler. The thermodynamic and heat transfer rules that govern supercritical gas cooling are dramatically different than those for condensing. Colmac CoilPro software correctly and accurately sizes supercritical gas coolers which are then designed to handle the high pressures associated with supercritical CO2.


Evaporators for industrial refrigeration systems can be designed to operate any type of system configuration including direct expansion, gravity flooded, pump recirculated, and control pressure receiver (CPR). Refrigeration evaporator design and manufacture is an area of special expertise and experience with Colmac Coil. Pump recirculated and control pressure receiver (CPR) evaporators can be circuited for either top feed or bottom feed. Inline or staggered tube patterns with standard or variable fin spacings are available for wet or frosted fin conditions. Evaporators operating in frosting conditions can be arranged for a number of different defrost methods including: air defrost, electric defrost, hot has defrost, water defrost, interlaced warm glycol defrost.

Oil Cooler

The heat of compression acts to heat compressor lubricating oil which must then be actively cooled in industrial systems. One method of cooling compressor oil is using an air-cooled oil cooling coil. Colmac has developed special expertise in the use of turbulators to improve oil cooling efficiency and capacity. Oil pumping power and coil size can simultaneously be reduced with this proprietary device. Call Colmac - "The Heat Transfer Experts" - the next time you need heating or cooling coils for your industrial refrigeration system.

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