This paper aims at deriving design recommendations for plate heat exchanger (PHE) evaporators and condensers in heat pump (HP) systems using different refrigerants. A coupled HP - PHE simulation framework was used to carry out cycle and component design for a case study, with different combinations of PHE geometrical parameters, and propane, butane and propylene/butane (0.5/0.5) as refrigerants. An operating model subsequently evaluated the heat pump thermodynamic and economic performance with the different designed PHEs: the trade-off between heat transfer area and refrigerant pressure drops was therefore taken into account for both components. Only evaporator pressure drops affected the Coefficient of Performance (COP), and different refrigerants presented dissimilar slopes of degradation. Condenser design did not influence the COP, and the economic optimum corresponded to the lowest size. The evaporator design at minimum cost was instead found as a trade-off between heat transfer area and pressure drops for all the working fluids. Despite the different rates of COP drop, the three refrigerants resulted in the same optimal pressure drop at the evaporator, equal to around 5 kPa.
|Title of host publication||Proceedings of the 25th IIR International Congress of Refrigeration|
|Number of pages||8|
|Publisher||International Institute of Refrigeration|
|Publication status||Published - 2019|
|Event||25th IIR International Congress of Refrigeration (ICR 2019) - Montréal , Canada|
Duration: 24 Aug 2019 → 30 Aug 2019
|Conference||25th IIR International Congress of Refrigeration (ICR 2019)|
|Period||24/08/2019 → 30/08/2019|
Bibliographical noteCopyright © IIF/IIR.
Published with the authorization of the International Institute of Refrigeration (IIR): www.iifiir.org
- Pressure drops
- Zeotropic mixtures
- Economic analysis