Investigation of a high-temperature combination heat pump for lower-cost electrification in multifamily buildings

Kim, Junyoung; James, Nelson; Maguire, Jeff

doi:10.1016/j.apenergy.2024.124225

Title: Investigation of a high-temperature combination heat pump for lower-cost electrification in multifamily buildings

Journal Article · 20 September 2024 · Applied Energy

DOI: https://doi.org/10.1016/j.apenergy.2024.124225 · OSTI ID:2440268

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National Renewable Energy Laboratory (NREL), Golden, CO (United States)

The development of space and water heating combination heat pumps capable of generating water temperatures high enough for convective heat emitters will enable more cost-effective and equitable decarbonization solutions for electrifying multifamily buildings. Here, in this paper, multifamily building models and a charge-sensitive mechanistic cycle model of a combination heat pump are developed, and the system performance is predicted based on the models. Unlike other state-of-the-art residential heat pumping equipment, the modeled combination heat pump using an economized, fluid-injected variable-speed compressor can achieve higher temperature lifts of 40° - 85°C, with lower installation costs and complexity. The model predicted heating coefficient of performance (COP_h) is 2.1 at an ambient temperature of -15°C with a high-temperature lift of nearly 85°C, and a seasonal coefficient of performance in heating mode (SCOP_h) ranges from 2 - 4 for different locations. The system shows 30% - 90% lower CO₂eq emissions over a condensing gas boiler and 9% - 13% lower projected installation costs than two separate space and water heat pumping appliances.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

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

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 2440268

Report Number(s):: NREL/JA--5500-88235; MainId:89010; UUID:e2b05b20-36bf-4b96-9d80-85720c7799f8; MainAdminId:73430

Journal Information:: Applied Energy, Journal Name: Applied Energy Vol. 376; ISSN 0306-2619

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
combination heat pump
electrification
high-temperature heat pump
modeling
multifamily building

Title: Investigation of a high-temperature combination heat pump for lower-cost electrification in multifamily buildings

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