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Experimental and theoretical analysis of a dual-source heat pump system with PVT assistance and adaptive combined throttling regulation for summer applications

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  • Song, Zhiying
  • Zhang, Yuzhe
  • Tang, Yayun
  • Ji, Jie

Abstract

Most existing solar-assisted heat pumps (SAHP) mainly focus on heating performance, while refrigeration is rarely noticed. Although hot water is still needed in summer, the demand is low. Even if some SAHPs realized multi functions, the cooling is either limited or poor in performance and adjustment. To solve the problems, the multi-function PVT assisted PV-air double source heat pump (MF-PVTA-DSHP) is designed in this paper. Summer days, the PVT mode could provide domestic hot water and electricity with low consumption. Tests reveal 2.21 × 107 J heat and 3.633 kWh power production in a sunny summer day. Summer cooling and winter heating conditions are quite different, requiring more flexible throttling capacity. The EEV and capillary are innovatively composed in the heat pump to expand its modulation for cooling condition and the energy efficiency. Results show that the creative strategy optimized the superheat degree at the compressor inlet, decreasing the temperature difference from 8.3 °C to 3.9 °C and power consumption by 20 W at the beginning, improving the mean COP from 3.36 to 3.43. Furthermore, taking advantage of radiative cooling of PV, the system could use air superimposed radiative cooling (air-RC) condenser to lower condensing temperature & throttling supercooling, and elevate cooling capacity. The cooling COP could be improved by almost 1.5 from experiment, showing superb exalting potential.

Suggested Citation

  • Song, Zhiying & Zhang, Yuzhe & Tang, Yayun & Ji, Jie, 2025. "Experimental and theoretical analysis of a dual-source heat pump system with PVT assistance and adaptive combined throttling regulation for summer applications," Applied Energy, Elsevier, vol. 397(C).
    • Handle: RePEc:eee:appene:v:397:y:2025:i:c:s0306261925010542
    DOI: 10.1016/j.apenergy.2025.126324
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