Simulation Study of Single-Adsorber Heat Pump Cycle with Heat Recovery Through Stratified Storage in Both Adsorber and Evaporator/Condenser Loops

Alireza Sadeghlu and Ferdinand P. Schmidt ()
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Alireza Sadeghlu: Energy and Building Technology Group, Institute of Applied Thermofluidics, Karlsruhe Institute of Technology (KIT), Kaiserstr. 12, 76131 Karlsruhe, Germany
Ferdinand P. Schmidt: Energy and Building Technology Group, Institute of Applied Thermofluidics, Karlsruhe Institute of Technology (KIT), Kaiserstr. 12, 76131 Karlsruhe, Germany

Energies, 2024, vol. 17, issue 21, 1-25

Abstract: A modified single-adsorber cycle for a gas-fired adsorption heat pump (GAHP) is described and analyzed through dynamic simulation with Modelica. The adsorption modules are based on the SAPO-34 / water working pair with parameters taken from a recent R&D project. A stratified storage integrated into the primary heat pump loop is employed for heat recovery of the adsorber as well as the EC heat exchanger (functioning both as an evaporator and condenser). A heating system of a stock multifamily residential building in Germany is assumed as the load to be covered by the heat pump. Representative load points according to VDI 4650-2 and DIN EN 12309-6 rules are considered. The hydraulic system design and implications of the storage integration on degrees of freedom during operation are discussed. The results show that, for a well-stratified storage, similar COP values to a dual-adsorber heat pump cycle based on the same adsorption module type are achievable. Possible additional benefits of the storage are discussed.

Keywords: single-adsorber cycle; dual-adsorber cycle; sensible heat recovery; gas adsorption heat pump; seasonal gas utilization efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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