Heating Performance Characteristics of a Heat Pump with a Variable Speed Injection Scroll Compressor

2012 ◽  
Vol 24 (5) ◽  
pp. 377-384 ◽  
Author(s):  
Suk-Bin Ko ◽  
Jae-Hyeok Heo ◽  
Il-Yong Cho ◽  
Yong-Chan Kim
Keyword(s):  
Heat Pump ◽  
Performance Characteristics ◽  
Variable Speed ◽  
Scroll Compressor ◽  
Heating Performance

Effect of Refrigerant Flow Control on the Heating Performance of a Variable-Speed Heat Pump Operating at Low Outdoor Temperature

2005 ◽  
Vol 127 (2) ◽  
pp. 277-286 ◽  
Author(s):  
Bong H. Kim ◽  
Dennis L. O’Neal
Keyword(s):  
Flow Control ◽  
Heat Pump ◽  
Performance Enhancement ◽  
Capillary Tube ◽  
Opening Angle ◽  
Variable Speed ◽  
Outdoor Temperature ◽  
Heating Performance ◽  
Heating Capacity ◽  
Expansion Valve

An experimental study was conducted to investigate the effect of electronic flow control on the performance of a variable-speed heat pump. A heat pump with two different expansion devices (capillary tube and electronic expansion valve) was tested in a psychrometric calorimeter over a range of outdoor temperatures from −15 to 7°C. Heat pump performance was first optimized with respect to charge for each expansion device through cycle-matching tests. Parametric tests also were conducted by changing compressor speed and opening angle for the electronic expansion valve at each outdoor temperature. The refrigeration cycle characteristics of the electronic valve were illustrated using pressure-enthalpy diagrams. Performance enhancement was also analyzed in terms of superheat, heating capacity, and energy efficiency ratio (EER). Comparison of the capillary tube and electronic valve indicated that the superheat significantly improved when using the electronic valve. Also, unit showed larger heating capacity and EER with the electronic valve than with the capillary tube except when the compressor speed was above 95 Hz. Enhancement of heating performance became larger as outdoor temperature decreased.

Heating performance characteristics of a dual source heat pump using air and waste heat in electric vehicles

2014 ◽  
Vol 119 ◽  
pp. 1-9 ◽  
Author(s):  
Jae Hwan Ahn ◽  
Hoon Kang ◽  
Ho Seong Lee ◽  
Hae Won Jung ◽  
Changhyun Baek ◽  
...  
Keyword(s):  
Heat Pump ◽  
Electric Vehicles ◽  
Waste Heat ◽  
Performance Characteristics ◽  
Heating Performance ◽  
Dual Source
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