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Ammonia Chiller COP & Cycle Performance Calculator mechanical
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Ammonia Chiller COP & Cycle Performance Calculator

Determine Coefficient of Performance (COP), compressor indicated brake horsepower (BHP/TR), power consumption (kW/TR), and heat rejection for R-717 ammonia systems.

Operating Temperatures

Compressor & Motor Efficiencies

Cycle Performance & Power

Coefficient of Performance (COP)
--
--% of Carnot limit
Specific Power (kW/TR)
-- kW/TR
-- BHP/TR
Total Compressor Power
-- kW
-- Electric HP
Pressure Ratio (Pcond / Pevap): -- : 1
Total Heat of Rejection (THR): -- MBH (-- TR)
Mass Flow of Ammonia: -- lb/min NH3
Economized single-stage screw compressors increase capacity by 15-20% and reduce kW/TR power draw by 8-12% at sub-zero evaporator temperatures.

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Frequently Asked Questions

Why does ammonia (R-717) have superior COP compared to synthetic halocarbons?

Ammonia has the highest latent heat of vaporization of any commercial refrigerant (approximately 560 BTU/lb compared to 60-80 BTU/lb for R-404A or R-134a). This requires 85% less circulating refrigerant mass flow to deliver the same tonnage, drastically reducing liquid line friction losses and compressor displacement work.

What is the function of a flash economizer on a screw compressor?

A flash economizer subcools high-pressure liquid refrigerant at an intermediate pressure before it enters the main low-temperature evaporator. The flash gas generated during subcooling is piped into a mid-stage economizer port on the screw compressor, boosting cooling capacity by 15-20% with minimal extra compressor shaft work.

When is a two-stage refrigeration system mandatory?

When the compression ratio (Pcond / Pevap) exceeds 7:1 to 8:1 (typically below -15°F / -26°C evaporator temperature), single-stage compression causes extreme discharge temperatures exceeding 250°F (121°C) that break down lubricating oils and reduce volumetric efficiency. Two-stage systems divide compression with intermediate desuperheating.