Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Limiting Throttling Losses by Intracycle Evaporative Cooling



B. S. Kim, Piotr A. Domanski


The temperature glide of zeotropic mixtures during phase change provides the opportunity to limit throttling losses of the refrigerant leaving the condenser. The difference between the intracycle evaporative cooling and the liquid-line/suction-line heat exchanger, instead of superheated vapor, is that a two-phase low-pressure refrigerant is used to subcool the high-pressure liquid leaving the condenser. The merits of the intracycle evaporative cooling were evaluated by a semi-theoretical simulation model and in the NIST's Small Breadboard Heat Pump at the cooling mode operating condition typical for a water-to-water residential heat pump. The capacity, coefficient of performance (COP), pressures, and temperature profiles of refrigerant and heat-transfer fluid in the heat exchangers are reported. The laboratory measured improvement of the COP was 4.0% for R32/152a(50/50), 3.6% for R407C, and 1.8% for R23/152a(20/80).
Proceedings Title
KSME-JSME Thermal Engineering Third (3rd) Conference
Conference Dates
October 20-23, 1996
Conference Location
Kyongju, KR


cooling, evaporative cooling, simulation, test facilities, refrigeration


Kim, B. and Domanski, P. (1996), Limiting Throttling Losses by Intracycle Evaporative Cooling, KSME-JSME Thermal Engineering Third (3rd) Conference, Kyongju, KR, [online], (Accessed June 19, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created October 19, 1996, Updated October 12, 2021