Feasibility of ground-source heat pump heating system assisted by natural gas boiler in large-scale terraced glass greenhouse

doi:10.3969/j.issn.1004-1524.20240641

Acta Agriculturae Zhejiangensis ›› 2025, Vol. 37 ›› Issue (7): 1533-1544.DOI: 10.3969/j.issn.1004-1524.20240641

• Biosystems Engineering • Previous Articles Next Articles

Feasibility of ground-source heat pump heating system assisted by natural gas boiler in large-scale terraced glass greenhouse

CHEN Tongqiang¹(), XU Fengjiao¹, ZHOU Baochang², WANG Fulin¹, MENG Lingzhao¹, LI Youli²^,^*()

1. Triumph Haofeng Intelligent Agriculture Group Co., Ltd., Qingdao 266606, Shandong, China
2. Intelligent Equipment Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China

Received:2024-07-16 Online:2025-07-25 Published:2025-08-20

Abstract

Abstract:

In this study, the feasibility of ground-source heat pump (GSHP) heating system assisted by natural gas boiler was explored in large-scale terraced glass greenhouse. The experiment was conducted from October 4^th, 2022 to May 15^th, 2023, in a 25.44 hm² glass greenhouse in Dezhou, Shandong Province of China. In the control group, a natural gas boiler was used as the sole heating equipment, while in the experimental group, a GSHP heating system assisted by natural gas boiler was employed. The effectiveness of this coupled heating system was examined from thermal environment, energy savings, greenhouse gas emission reduction, and economic performance. The results showed that the thermal environment (temperature, air enthalpy) in the experimental greenhouse was consistent with that in the control greenhouse during the heating period. The energy cost for the experimental greenhouse was 73.12 yuan·m^-2, lower than the control greenhouse by 22.72 yuan·m^-2. Based on the energy prices and climate under the experiment conditions, the payback period was 6 years. The coefficient of performance (COP) for the experiment group was 2.64, with an energy-saving rate of 25.82%. Additionally, there was a linear positive correlation between the weekly natural gas consumption in both greenhouses and the sum of the daily temperature differences inside and outside the greenhouse. Under the same temperature difference, the control group consumed more natural gas weekly than the experimental group, and as the temperature difference increased, the gap in natural gas consumption widened. During the heating period, the experimental greenhouse consumed 12.92 m³·m^-2 of natural gas, which was 52.56% of the control group, resulting in a reduction of 2 397 t of CO₂ emission. In conclusion, heating glass greenhouses with the GSHP heating system assisted by natural gas boiler in northern China, could meet the heating demand, and significantly reduce energy consumption and costs, showing great potential for widespread application.

Key words: ground-source heat pump, natural gas, terraced glass greenhouse, economical efficiency, heating energy cost, capital pay-off time

CLC Number:

S215

CHEN Tongqiang, XU Fengjiao, ZHOU Baochang, WANG Fulin, MENG Lingzhao, LI Youli. Feasibility of ground-source heat pump heating system assisted by natural gas boiler in large-scale terraced glass greenhouse[J]. Acta Agriculturae Zhejiangensis, 2025, 37(7): 1533-1544.

Figures/Tables 10

References 36

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场所 Location	累计温度 Accumulated temperature/ ℃	全天平均温度 Daily temperature/ ℃	全天平均湿度 Daily relative humidity/%	空气焓值 Air enthalpy/ (kJ·kg^-1)	日间平均温度 Average daytime temperature/℃	日间平均湿度 Average daytime relative humidity/%	夜间平均温度 Average night temperature/℃	夜间平均湿度 Average night relative humidity/%
G1	4 959.9	19.15	79.13	47.82	22.46	77.07	16.07	81.57
G2	4 983.1	19.23	78.70	47.97	22.36	78.01	16.34	79.94
室外	2 584.6	9.98	—	—	12.17	—	7.87	—
Outside

场所 Location	累计温度 Accumulated temperature/ ℃	全天平均温度 Daily temperature/ ℃	全天平均湿度 Daily relative humidity/%	空气焓值 Air enthalpy/ (kJ·kg^-1)	日间平均温度 Average daytime temperature/℃	日间平均湿度 Average daytime relative humidity/%	夜间平均温度 Average night temperature/℃	夜间平均湿度 Average night relative humidity/%
G1	4 959.9	19.15	79.13	47.82	22.46	77.07	16.07	81.57
G2	4 983.1	19.23	78.70	47.97	22.36	78.01	16.34	79.94
室外	2 584.6	9.98	—	—	12.17	—	7.87	—
Outside

温室 Greenhouse	天然气用量 Gas comsumpition/m³	天然气费用 Gas cost/ (10⁶ yuan)	用电量 Electricity consumption/ (kW·h)	电费 Electricity cost/ (10⁶yuan)	总能源成本 Total energy cost/ (10⁶yuan)
G1	1 615 141	6.30	5 404 360	2.84	9.14
G2	3 072 270	11.98	—	—	11.98

温室 Greenhouse	天然气用量 Gas comsumpition/m³	天然气费用 Gas cost/ (10⁶ yuan)	用电量 Electricity consumption/ (kW·h)	电费 Electricity cost/ (10⁶yuan)	总能源成本 Total energy cost/ (10⁶yuan)
G1	1 615 141	6.30	5 404 360	2.84	9.14
G2	3 072 270	11.98	—	—	11.98

加热模式 Heating mode	时期 Period	最大加热需求 Maximum heating demand/ (MJ·m^-2·d^-1)	平均加热需求 Average heating demand/ (MJ·m^-2·d^-1)	地源热泵最大供热量 Maximum energy input by GSHP/ (MJ·m^-2·d^-1)	地源热泵平均供热量 Average energy input by GSHP/ (MJ·m^-2·d^-1)	平均COP Average COP
GSHP	2022-10-04—2022-11-04	3.69	2.28	3.69	2.28	4.90
GSHP+GB	2022-11-05—2023-05-17	8.57	4.14	4.20	1.81	2.64
GB	2022-10-04—2023-05-17	8.57	3.88	—	—	—

Feasibility of ground-source heat pump heating system assisted by natural gas boiler in large-scale terraced glass greenhouse

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