Searching for Suitable Binary Fluid for an Ejector Heat Pump for Domestic Water Heating

Wang, Pengtao; Abu-Heiba, Ahmad; Mohammed, Ramy H.; Spitzenberger, Jeremy; Kowalski, Stephen; Ismael, Laith; Ma, Hongbin; Nawaz, Kashif

doi:10.1115/1.4064648

Searching for Suitable Binary Fluid for an Ejector Heat Pump for Domestic Water Heating

Journal Article · Mon Feb 19 00:00:00 EST 2024 · Journal of Thermal Science and Engineering Applications

DOI:https://doi.org/10.1115/1.4064648· OSTI ID:2311318

Wang, Pengtao ^[1]; Abu-Heiba, Ahmad ^[2]; Mohammed, Ramy H. ^[3]; Spitzenberger, Jeremy ^[3]; Kowalski, Stephen ^[2]; Ismael, Laith ^[3]; Ma, Hongbin ^[3]; Nawaz, Kashif ^[2]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Building Technologies Research and Integration Center (BTRIC); Univ. of Missouri, Columbia, MO (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Building Technologies Research and Integration Center (BTRIC)
Univ. of Missouri, Columbia, MO (United States)

Water heating is a major source of energy consumption in the U.S. residential sector. Heat pumps can significantly increase the energy efficiency of water heating. An ejector heat pump (EHP) is a novel, thermally driven heat pump that uses an ejector as a thermocompressor. Choosing suitable working fluids is critical in developing high-performance EHPs. Therefore, this research screens binary fluid pairs (BFPs) for EHPs to produce domestic hot water at a high coefficient of performance (COP). The criteria for screening BFP candidates for EHP water heaters (EHPWHs) are established, and BFP candidates are shortlisted. This study identifies HFE7000, Novec649, HFE7100, HFE7200, and HFE7500 for the primary fluids and RE170, R600a, R600, and R1234ze(Z) for the secondary fluids. The thermodynamic model is employed to investigate the performance of EHPWHs using the shortlisted BFPs under various operating parameters, including the evaporation pressure of the primary working fluid in the high-temperature evaporator and the condensation temperature. In conclusion, the highest heating-cycle COP of 1.328 is achieved by an EHPWH operating with HFE7000/R600 at a condenser temperature of 50 °C and a pressure of 1.69 MPa in the high-temperature evaporator.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2311318

Journal Information:: Journal of Thermal Science and Engineering Applications, Journal Name: Journal of Thermal Science and Engineering Applications Journal Issue: 4 Vol. 16; ISSN 1948-5085

Publisher:: ASMECopyright Statement

Country of Publication:: United States

Language:: English

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