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Performance of Solar-driven Ejector Refrigeration System (SERS) as pre-cooling system for air handling units in warm climates

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  • Peris Pérez, Bernardo
  • Ávila Gutiérrez, Miguel
  • Expósito Carrillo, José Antonio
  • Salmerón Lissén, José Manuel

Abstract

Europe is encouraging new buildings to minimize their primary energy dependence to be considered, from 2021, Nearly Zero Energy Buildings (NZEB). In this regard, solar thermal energy is being extensively used as a renewable source to produce Domestic Hot Water (DHW). However, solar thermal energy fields may be oversized during the warmest season of the year, rejecting the waste heat to the ambient while increasing the air conditioning demand. The Solar-driven Ejector Refrigeration System (SERS) may be a solution for solar cooling. Nevertheless, the SERS performance is constrained when low to medium temperature solar thermal collectors, commonly installed for DHW production, are used in warm climates. Consequently, this paper reformulates the SERS application as a novel fresh air pre-cooling system for air handling units. Thereby, greater evaporating temperatures that enable the SERS adoption in NZEB are explored. In doing so, the seasonal performance under severe operating conditions is analyzed considering the two-phase flow ejector geometry, as well as refrigerants with low global warming potential. Main results demonstrate a maximum seasonal COP of 0.37 by using R717. Moreover, an average cooling capacity of 28.3 kW could be produced per kW of electricity if an optimized multi-ejector solution with R600 is adopted.

Suggested Citation

  • Peris Pérez, Bernardo & Ávila Gutiérrez, Miguel & Expósito Carrillo, José Antonio & Salmerón Lissén, José Manuel, 2022. "Performance of Solar-driven Ejector Refrigeration System (SERS) as pre-cooling system for air handling units in warm climates," Energy, Elsevier, vol. 238(PA).
    • Handle: RePEc:eee:energy:v:238:y:2022:i:pa:s0360544221018958
    DOI: 10.1016/j.energy.2021.121647
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    References listed on IDEAS

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