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A Study on Greenhouse Heating System with Air Source Heat Pump

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Abstract
Energy conservation is an essential issue in greenhouse farming. Since greenhouseoperations use significant amounts of fossil fuel oil, energy conservation is expected toprotect farmer's profit and reduce global warming. To have good environmental conditions,several variables must be regulated. Inside a greenhouse, temperature, humidity, and lightare the most significant parameters to be regulated, especially in winter and at lowtemperatures at night. This study was conducted greenhouse heating for using heat pumpsystem that surplus air source and outdoor air source. The greenhouse experiment systemperformed on December 08, 2020, and December 13, 2020, selected days in similarenvironments of condition and experiment to measure the required parameters to be used in agreenhouse with a length, width, and height was 10.0m, 5.4m, 4.6m and located in JejuNational University, Korea. This system consists of a heat pump system including heatstorage tanks, fan-coil-units in the greenhouse, and an electric heater for supplementalheating. The experiment condition was to run a heat pump system using a surplus air sourceand outdoor air source each day. The experiment of greenhouse inside the set temperaturewas between 12℃ to 15℃. The greenhouse heating system has two modes. The first modewas heating mode, the greenhouse inside temperature lower than 12℃ and heat it until 15℃.The second mode was storage mode that stored heat from heat pump to storage tanks whenthe greenhouse temperature was higher than 15℃. In the results storage mode: surplus heatsource system was performed the average power consumption and COP were, 3.8 kW and3.7 and outdoor heat source system was the average power consumption and COP were 3.7kW and 2.9. Heating mode: The surplus heat source system evaluated with average powerconsumption and COP was 3.8 kW and 3.7 and outdoor heat source system. The averagepower consumption and COP were 3.7 kW and 2.9, respectively. In conclusion, experimentalresults show that surplus heat source of heat pump system was a high estimated averagecapacity 12.8 kW, while the outdoor heat source of heat pump system was 10.6 kW.Greenhouse heating system of surplus heat source energy saved 7.6 % than an outdoor heatsource system. Furthermore, it saved power consumption by 16.6 % than the outdoor heatsource system when heating mode performed. In COP of surplus heat source system installedan average of 3.6 and outdoor heat source system average of 2.7. The surplus heat source ofheat pump was 0.9 higher than the outdoor heat source heat pump.
Author(s)
Enkhbadral Gantulga
Issued Date
2021
Awarded Date
2021. 2
Type
Dissertation
URI
https://oak.jejunu.ac.kr/handle/2020.oak/23478
Affiliation
제주대학교 대학원
Department
대학원 에너지응용시스템학부 Mechanical Engineering
Advisor
Park, Youn Cheol
Table Of Contents
1 INTRODUCTION . 1
1.1 Background 1
1.2 Climate conditions . 3
2 GREENHOUSE CONSTRUCTION . 6
2.1 Greenhouse style 6
2.2 Greenhouse covering material type 8
2.3 Frame material . 9
2.4 Reduce air leaks . 10
2.5 Flooring or base . 10
2.6 Heat exchangers . 11
2.7 Control system and sensors 14
3 EXPERIMENTAL DEVICES AND METHODS . 15
3.1 Experimental methods and greenhouse properties . 15
3.2 Heat losses of greenhouse 21
3.3 Solar radiation greenhouse . 22
3.4 Greenhouse heating system 25
3.5 Experimental conditions. 27
3.6 Heat storage tank 29
3.7 Circulating pump 31
3.8 Fan Coil Unit 32
4 RESULT AND DISCUSSION 33
4.1 Storage mode 33
4.2 Heating mode . 38
5 CONCLUSIONS 46
REFERENCES. 48
Degree
Master
Publisher
제주대학교 대학원
Citation
Enkhbadral Gantulga. (2021). A Study on Greenhouse Heating System with Air Source Heat Pump
Appears in Collections:
Faculty of Applied Energy System > Mechanical Enginering
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