A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Air bypass in vertical stack water source heat pumps
Vertical stack water source heat pumps are widely used to provide both comfort cooling and heating to buildings. A problem of air bypass, in which some return air does not pass over the indoor coil of the heat pump, was encountered, causing performance degradation of the heat pumps. This article quantifies the air bypass problem in vertical stack water source heat pumps and the associated impacts. Field testing at five different sites was performed, and results show that air bypass occurred in all five installations. Three methods are proposed to detect and diagnose the air bypass problem. By sealing air bypass locations after the diagnostics, the improvement in cooling efficiency ranged from ∼7% to 17% and averaged 12.8%, and the improvement in heating efficiency ranged from ∼16% to 19% and averaged 17.5%. Based on the locations of air bypass, it is shown that ∼55% of bypassed air was passing through the locations, which are common in all types of heat pumps.
Air bypass in vertical stack water source heat pumps
Vertical stack water source heat pumps are widely used to provide both comfort cooling and heating to buildings. A problem of air bypass, in which some return air does not pass over the indoor coil of the heat pump, was encountered, causing performance degradation of the heat pumps. This article quantifies the air bypass problem in vertical stack water source heat pumps and the associated impacts. Field testing at five different sites was performed, and results show that air bypass occurred in all five installations. Three methods are proposed to detect and diagnose the air bypass problem. By sealing air bypass locations after the diagnostics, the improvement in cooling efficiency ranged from ∼7% to 17% and averaged 12.8%, and the improvement in heating efficiency ranged from ∼16% to 19% and averaged 17.5%. Based on the locations of air bypass, it is shown that ∼55% of bypassed air was passing through the locations, which are common in all types of heat pumps.
Air bypass in vertical stack water source heat pumps
Varshney, Kapil (author) / Shapiro, Ian (author) / Bronsnick, Yossi (author) / Holahan, Jim (author)
HVAC&R Research ; 17 ; 692-709
2011-10-01
18 pages
Article (Journal)
Electronic Resource
English
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