Abstract
As the use of fossil fuel has increased, not only in construction, but also in agriculture due to the drastic industrial development in recent times, the problems of heating costs and global warming are getting worse. Therefore, introduction of more reliable and environmentally-friendly alternative energy sources has become urgent and the same trend is found in large-scale horticulture facilities. In this study, among many alternative energy sources, we investigated the reserves and the potential of various different unused energy sources which have infinite potential, but are nowadays wasted due to limitations in their utilization. In addition, we utilized available unused energy as a heat source for a heat pump in a large-scale horticulture facility and analyzed its feasibility through EnergyPlus simulation modeling. Accordingly, the discharge flow rate from the Fan Coil Unit (FCU) in the horticulture facility, the discharge air temperature, and the return temperature were analyzed. The performance and heat consumption of each heat source were compared with those of conventional boilers. The result showed that the power load of the heat pump was decreased and thus the heat efficiency was increased as the temperature of the heat source was increased. Among the analyzed heat sources, power plant waste heat which had the highest heat source temperature consumed the least electric energy and showed the highest efficiency.
Highlights
Due to the worldwide population growth and industrial development in the past 100 years, the emission of greenhouse gases such as CO2, CH4, N2O, and CFCS has increased, causing a drastic increase of the Earth’s average temperature
This study was conducted to apply temperature difference energy from natural sources such as river water, sea water, and groundwater, which are considered as not affecting the urban environment ecologically, waste heat from power plants, which is considered as recycled energy, and unused energy such as geothermal heat to a large-scale horticulture facility in order to analyze the heating performance of each heat source and compare the energy consumption characteristics, suggesting the optimum heat source for a heat pump
The heat sources applied to horticulture were air heat source, geothermal heat, power plant waste heat, sea water heat, and river water
Summary
Due to the worldwide population growth and industrial development in the past 100 years, the emission of greenhouse gases such as CO2, CH4, N2O, and CFCS has increased, causing a drastic increase of the Earth’s average temperature. Considering that about 92% of the heating energy source comes from fossil fuels, which are highly dependent on imports, the application of more reliable and environmentally-friendly alternative energy sources in large-scale horticulture facilities is urgently needed [3] In this regard, Park et al [4] showed that application of a horizontal type geothermal heat pump to horticulture for heating reduced the cost by about 67.8%. This study was conducted to apply temperature difference energy from natural sources such as river water, sea water, and groundwater, which are considered as not affecting the urban environment ecologically, waste heat from power plants, which is considered as recycled energy, and unused energy such as geothermal heat to a large-scale horticulture facility in order to analyze the heating performance of each heat source and compare the energy consumption characteristics, suggesting the optimum heat source for a heat pump
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