Performance study of solar air collector-air source heat pump system inside the greenhouse

Xiaomin Li; Qingbai Wu; Jinping Li; Junjie Zhu; Vojislav Novakovic

Case Studies in Thermal Engineering (Nov 2024)

Performance study of solar air collector-air source heat pump system inside the greenhouse

Xiaomin Li,
Qingbai Wu,
Jinping Li,
Junjie Zhu,
Vojislav Novakovic

Affiliations

Xiaomin Li: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, 730050, China; Collaborative Innovation Center for Supporting Technology of Northwest Low-Carbon Towns, Lanzhou, 730050, China; Gansu Key Laboratory of Complementary Energy System of Biomass and Solar Energy, Lanzhou, 730050, China; Gansu Natural Energy Research Institute, Lanzhou, 730050, China
Qingbai Wu: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, 730050, China; Collaborative Innovation Center for Supporting Technology of Northwest Low-Carbon Towns, Lanzhou, 730050, China; Gansu Key Laboratory of Complementary Energy System of Biomass and Solar Energy, Lanzhou, 730050, China
Jinping Li: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, 730050, China; Collaborative Innovation Center for Supporting Technology of Northwest Low-Carbon Towns, Lanzhou, 730050, China; Gansu Key Laboratory of Complementary Energy System of Biomass and Solar Energy, Lanzhou, 730050, China; Corresponding author. School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, 730050, China.
Junjie Zhu: Solar Energy Department, Institute for Energy Technology, Kjeller, 2007, Norway
Vojislav Novakovic: Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, NO-7491, Norway

Journal volume & issue: Vol. 63
p. 105292

Abstract

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During the process of heating greenhouses, the phenomenon of inadequate heating installations is widespread. To address this issue, this paper proposed a solar air collector-air source heat pump (SAC-ASHP) system for greenhouses, combining solar technology with heat pump (HP) technology to provide sufficient heat during continuous cloudy days and winter. The heating capacities of the system on sunny, cloudy, and overcast days were 100.2 kWh, 112.3 kWh, and 157.8 kWh, respectively. The corresponding power was 30.1 kWh, 36.1 kWh, and 53.6 kWh. The coefficient of performance (COP) of the single air source heat pump (ASHP) for these days was 3.4, 3.2, and 3.0, respectively, while the COP of the solar heat pump (SHP) was 4.0, 3.5, and 3.1. Additionally, greenhouse employed heat and moisture recovery for humid air, aiming to provide a suitable environment for plant growth around the clock while conserving energy. The heat collection in the heat and moisture recovery combined HP mode was 66.7 % higher than in the heat exchanger (HE)-fan mode. This experimental study investigated the operational performance of the system in dynamic environments, revealing the stability of the system for greenhouse heating in cold regions, and providing new research ideas for greenhouse heating.

Published in Case Studies in Thermal Engineering

ISSN: 2214-157X (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Engineering (General). Civil engineering (General)
Website: http://www.journals.elsevier.com/case-studies-in-thermal-engineering/

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