Thermodynamic analysis of a two-stage binary-fluid ejector heat pump water heater

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

doi:10.1016/j.tsep.2023.102050

Thermodynamic analysis of a two-stage binary-fluid ejector heat pump water heater

Journal Article · Mon Aug 07 00:00:00 EDT 2023 · Thermal Science and Engineering Progress

DOI:https://doi.org/10.1016/j.tsep.2023.102050· OSTI ID:1996727

^[1]; ^[2]; Mohammed, Ramy H. ^[3]; Spitzenberger, Jeremy ^[3]; ^[2]; Ma, Hongbin ^[3]; ^[2]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); University of Missouri, Columbia, MO (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
University of Missouri, Columbia, MO (United States)

Ejector heat pump water heaters (EHPWHs) could significantly increase the thermal efficiency of domestic water heating and reduce greenhouse gas emissions. This study addresses two major technical barriers to using EHPWHs in domestic water heating—low heating cycle coefficient of performance (COP) and low condensation temperatures—using binary fluid pairs as a working fluid in a two-stage ejector system. A comprehensive, geometry-free model of binary-fluid ejectors was built and validated to predict the entrainment ratios of binary-fluid ejectors. A thermodynamic model of a two-stage binary-fluid ejector EHPWH was built to predict the heating cycle COP of EHPWHs. The performance of the EHPWH was theoretically evaluated using HFE7000 and Novec649 as primary fluids and R600 and R1234ze(Z) as secondary fluids. HFE7000/R600 gave the highest heating cycle COP (i.e., 1.356) in producing domestic hot water at 60.0 °C. An optimum evaporation temperature of the primary fluid was identified for the maximum effective entrainment ratio and effective pressure lift ratio of two-stage ejectors. Here, the effective entrainment ratio of the two-stage ejector dominated the heating cycle COP of the EHPWH. Primary fluids with lower latent heats of evaporation and/or secondary fluids with higher latent heats of evaporation yielded higher heating cycle COPs of EHPWHs.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1996727

Alternate ID(s):: OSTI ID: 1995597

Journal Information:: Thermal Science and Engineering Progress, Journal Name: Thermal Science and Engineering Progress Journal Issue: 1 Vol. 44; ISSN 2451-9049

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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