A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A semi-experimental investigation on the anti-frosting potential of homogenizing the uneven frosting for air source heat pumps
Abstract The uneven frosting on air source heat pumps’ (ASHPs) outdoor coils is undesired product, as it comes with additional defrosting energy consumption and may aggravate the frosting consequence. Homogenizing the uneven frosting may help suppressing frosting. In this study, visual experiments were conducted to clarify a typical uneven frosting phenomenon. It was observed that the air inlet side of ASHPs’ outdoor coils escaped from frosting, whereas frost built up on the outlet side. To clarify the air temperature/relative humidity (RH) conditions that would cause such uneven frosting, the frosting plot was depicted. On the frosting plot, most of the frosting region was occupied by the uneven frosting region. Homogenizing the uneven frosting may shrink the uneven frosting region, and thereby reduce the chance of frosting. To study the anti-frosting potential of homogenizing uneven frosting, a semi-experimental model was developed. The model calculations demonstrated that, by homogenizing the uneven frosting, the maximal air temperature causing frosting would reduce about 2.5 °C, and the minimal RH causing frosting would increase about 10%. In China, after homogenizing the uneven frosting, it was found that the annual frosting duration in the severe cold zone and the cold zone would be reduced by 30% to 50%; in the hot summer and cold winter zone and the mild zone be reduced by 50% to 80%; and in the hot summer and warm winter zone may achieve frosting-free.
A semi-experimental investigation on the anti-frosting potential of homogenizing the uneven frosting for air source heat pumps
Abstract The uneven frosting on air source heat pumps’ (ASHPs) outdoor coils is undesired product, as it comes with additional defrosting energy consumption and may aggravate the frosting consequence. Homogenizing the uneven frosting may help suppressing frosting. In this study, visual experiments were conducted to clarify a typical uneven frosting phenomenon. It was observed that the air inlet side of ASHPs’ outdoor coils escaped from frosting, whereas frost built up on the outlet side. To clarify the air temperature/relative humidity (RH) conditions that would cause such uneven frosting, the frosting plot was depicted. On the frosting plot, most of the frosting region was occupied by the uneven frosting region. Homogenizing the uneven frosting may shrink the uneven frosting region, and thereby reduce the chance of frosting. To study the anti-frosting potential of homogenizing uneven frosting, a semi-experimental model was developed. The model calculations demonstrated that, by homogenizing the uneven frosting, the maximal air temperature causing frosting would reduce about 2.5 °C, and the minimal RH causing frosting would increase about 10%. In China, after homogenizing the uneven frosting, it was found that the annual frosting duration in the severe cold zone and the cold zone would be reduced by 30% to 50%; in the hot summer and cold winter zone and the mild zone be reduced by 50% to 80%; and in the hot summer and warm winter zone may achieve frosting-free.
A semi-experimental investigation on the anti-frosting potential of homogenizing the uneven frosting for air source heat pumps
Pu, Jihong (author) / Shen, Chao (author) / Zhang, Chunxiao (author) / Yan, Xu (author)
Energy and Buildings ; 260
2022-02-10
Article (Journal)
Electronic Resource
English
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