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Size and match of the collector-evaporator for direct-expansion solar assisted heat pumps using potential alternative refrigerants.

Author(s) : MA J., ZHU X., FAN H., SU J., LU Y., ZHANG Z.

Type of article: IJR article

Summary

The design of solar-assisted heat pumps (DX-SAHPs) plays a crucial role in their effectiveness and stability. However, little study was conducted on the design of DX-SAHPs using potential alternative refrigerants. Even traditional refrigerants are being phased out due to their harmful impact on the environment. The primary design goal of a DX-SAHP is to establish the collector-evaporator area. Employing the thermodynamic analysis method, this study examined the collector-evaporator area for DX-SAHPs using potential alternative refrigerants and R410a under various design conditions. Additionally, a comprehensive investigation into how the collector-evaporator structural parameters affect the collector-evaporator area for DX-SAHPs was conducted. The results showed that: (1) an increase of solar radiation intensity by 100 reduces the required collector-evaporator area by at least 9.55 %. If the wind speed exceeds 4 m·s-1, an increase of wind speed by 1 increases the required collector-evaporator area by at least 14.53 % (2) Refrigerants with transcritical cycles have much larger collector-evaporator areas than refrigerants with subcritical cycles. (3) For the same design conditions, there is a minimal difference in area between the thermal and photovoltaic/thermal (PV/T) collector-evaporators, as well as between the copper and aluminum collector-evaporators. (4) It is feasible to reduce the collector-evaporator area by increasing the plate thickness and lowering the tube pitch of the collector-evaporator. However, the potential is limited.

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Pages: 253-266

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Details

  • Original title: Size and match of the collector-evaporator for direct-expansion solar assisted heat pumps using potential alternative refrigerants.
  • Record ID : 30033558
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 171
  • Publication date: 2025/03
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2024.12.002

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