At present, the widespread use of solar energy. Since Thailand is located in or near the equator in the heat. The solar energy is about 5.05 kWh / m2 of solar power is to be utilized in various fields. This research has produced a solar hot water with solar collector pattern Flat 2m2 pump size 0.20 kW electricity, solar water heating with heat pump size 3.04 kW calculate the coefficient of performance of heat pumps and performance. solar panel from the analysis, the coefficient of performance of the heat pump system is in the range from 4.2 to 5.5 the efficiency of solar energy in the range from 43.8 to 52.6% for the same system, the heat of the slaughterhouse. 30 kW electric heater hot water at a temperature of 62 ° C in the air and spinning wool boiled pig modular. Larger water volume 2.4 m3, which is the cost of each month, about 12,000 - 18,000 baht will consider the technology of hot water from the appropriateness of the technology used and the evaluation of economic studies have found that one can choose water system. Optimum and reduce the amount of electrical energy to produce hot water is solar hot water system. The expenditure bill per month is about 200 - 300 baht and hot water system with a heat pump with power bills per month, about 400 - 500 baht.
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