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, the 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. This study investigated the effects of the distance between the greenhouse and the actual heat source by taking into account the heat transfer taking place inside the pipe network. This study considered CO2 emissions and economic aspects to determine the optimal heat source. Payback period analysis against initial investment cost shows that a heat pump based on a power plant’s waste heat has the shortest payback period of 7.69 years at a distance of 0 km. On the other hand, the payback period of a heat pump based on geothermal heat showed the shortest payback period of 10.17 year at the distance of 5 km, indicating that heat pumps utilizing geothermal heat were the most effective model if the heat transfer inside the pipe network between the greenhouse and the actual heat source is taken into account.
Highlights
In the case of the heat pump using the power plant waste heat, the emission was 132 TCO2 based on the distance of 0 km and 143 TCO2 based on the distance of
In case of comparing TCO2 emissions between the heat pumps using the power plant waste heat with the lowest TCO2 emission and the gas boiler used previously, CO2 emissions are reduced by approximately 63%–65%, so it is considered that it is effective for reducing the emission of greenhouse gases
An analysis of economic feasibility comparing the electricity bill according to the electricity consumption of the heat pump for each heat source in comparison to the gas cost according to the gas consumption of a normal gas boiler was carried out
Summary
The development of civilization has increased human consumption of energy significantly. The most significant problem arising from the establishment of large-scale horticulture facilities is that these facilities still depend on petroleum which is a fossil fuel for most heating facilities and they require 24 h a day heating during the winter season in order to provide the necessary breeding conditions for greenhouse crops These facilities have large energy consumption due to the use of coverings with large heat transmission coefficients such as vinyl and glass during heating in the winter season. The development of technology for utilizing new and renewable energy which could replace fossil energy in agriculture and technology to reduce heating expenses which account for a large portion in the operation expense is a problem to be solved urgently [4] In this regard, Huh [4] carried out an analysis on the LCC and the payback period of investments according to the length of a heat exchanger by applying a heat pump. This study intended to analyze the inlet temperature pattern of each heat source, energy usage, CO2 generation and economic feasibility and present an optimized system configuration
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