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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Performance and dynamics of active greywater heat recovery in buildings
Authors: Hadengue, Bruno
Morgenroth, Eberhard
Larsen, Tove A.
Baldini, Luca
et. al: No
DOI: 10.1016/j.apenergy.2021.117677
Published in: Applied Energy
Volume(Issue): 305
Issue: 117677
Issue Date: 1-Jan-2022
Publisher / Ed. Institution: Elsevier
ISSN: 0306-2619
Language: English
Subjects: Greywater heat recovery; Decentralized; Heat pump; Domestic hot water; Wastewater; Energy efficiency
Subject (DDC): 620: Engineering
Abstract: In the effort to de-carbonize the building stock, heat pumps are increasingly utilized in Switzerland, with 70% of the fast-growing heat pump market using ambient air as heat source. Inexpensive and easy to implement, these heat pumps are, however, less efficient than their ground- or water-source counterparts. In this modeling study, we aim at increasing the efficiency of air-source heat pumps using domestic greywater-contained heat. We assess the performance improvement relative to standard heat pump configurations across various climates, seasons, building envelopes, and domestic hot water consumption patterns. The results show that the annually-averaged coefficient of performance improves by 4.1% on average – ranging from 0.6% to 7.5%. This efficiency gain translates on average to 1.8 kWh/week of compressor electricity savings. Although attractive due to its simplicity, the proposed open-loop configuration – preheating of an external heat source – only leads to moderate performance improvement of air-source heat pumps. Based on these results, we extensively discuss and compare alternative system configurations and identify several fundamental differences in the heat recovery dynamics of each configuration. We show that closed-loop systems – using greywater as direct heat source – show the largest performance improvement potential, although being more expensive and complex to implement.
Fulltext version: Published version
License (according to publishing contract): CC BY 4.0: Attribution 4.0 International
Departement: Architecture, Design and Civil Engineering
Organisational Unit: Centre for Building Technologies and Processes (ZBP)
Appears in collections:Publikationen Architektur, Gestaltung und Bauingenieurwesen

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