A Review on Flow Characteristics of Refrigerant and Oil Mixture in a Heat Pump System

2015 ◽  
Vol 23 (03) ◽  
pp. 1530002 ◽  
Author(s):  
Hak Soo Kim ◽  
Min Soo Kim
Keyword(s):  
Heat Pump ◽  
Volume Fraction ◽  
Flow Characteristics ◽  
Liquid Volume ◽  
Cyclone Separator ◽  
Liquid Volume Fraction ◽  
Pump System ◽  
Heat Pump System ◽  
Oil Retention ◽  
And Performance

This paper presents a comprehensive review of oil retention and performance of oil separator in a heat pump system. Liquid volume fraction model, viscous film model and analytical model from continuity and momentum equations for predicting the oil retention amount in a heat pump system are reviewed. In addition, weighing a test section, using an oil injection and extraction device and optical analysis for measuring the oil retention amount are introduced and experimental results are analyzed. Numerical studies which used commercial tools for computational fluid dynamics or suggested a new model by simplifying the flow in cyclone separator are reviewed. Effects of droplet size and angular velocity of gas phase flow in cyclone separator on the performance are discussed. Experimental methods for measuring the efficiency of oil separator are introduced, and theoretical analysis on the efficiency and pressure drop of cyclone separator is suggested.

Onsite measurement and performance analysis of capillary heat pump system used in subway tunnels

2021 ◽  
pp. 118008
Author(s):  
Zhen Tong ◽  
Yiming Guan ◽  
Tingtao Cao ◽  
Yongming Ji ◽  
Songtao Hu ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
And Performance ◽  
Subway Tunnels

Development and performance of a dual tank solar-assisted heat pump system

2015 ◽  
Vol 149 ◽  
pp. 125-132 ◽  
Author(s):  
Carsen J. Banister ◽  
Michael R. Collins
Keyword(s):  
Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
And Performance

Experimental Investigation on Heating Performance of Newly Designed Air Source Heat Pump System for Electric Vehicles

2020 ◽  
Vol 13 (2) ◽  
Author(s):  
Kang Li ◽  
Jun Yu ◽  
Rong Yu ◽  
Lin Su ◽  
Yidong Fang ◽  
...  
Keyword(s):  
Heat Pump ◽  
Electric Vehicles ◽  
Flow Characteristics ◽  
Cold Climate ◽  
Positive Temperature ◽  
Pump System ◽  
Cooling Performance ◽  
Heat Pump System ◽  
Heating Performance ◽  
Driving Range

Abstract Utilizing the heat from air source with heat pump system in electric vehicles shows a significant advantage from thermoelectric heat source for heat supply in cold climate. It could improve the driving range of electric vehicles considerably in winter and replace the positive temperature coefficient (PTC) heater with an acceptable cost and reliability. In this work, a newly designed heat pump system was first introduced with less components and cost. Second, experiments were conducted to investigate its cooling performance, and subsequent heating performance from −10 to 10 °C. The typical heat transfer and flow characteristics of refrigerant were recorded, and the behavior of each component including compressor, evaporator, condenser, and outside heat exchanger were analyzed and interpreted. The results showed that the heating and cooling performance of the new heat pump system could almost remain the same with traditional air-conditioning system in automobile and surely satisfy with the heat requirement of electric vehicles. In the heating mode, the maximum heating capacity increases by 13% at 400 m3/h air volume from 300 m3/h at the ambient temperature −10 °C, while the outlet air temperature decreases by 4–6%. In addition, using a heat pump system showed an increase in the driving range of electric vehicles by 25–31% as compared to PTC heaters.

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