A thermodynamic analysis on the utilization of thermal water

온수 이용에 관한 열역학적 해석

An analysis on the thermodynamic optimum use of thermal water has been accomplished. The systems investigated are power generation and space heating. The space heating systems considered in this study are direct heating, heat pumps and heat pump assisted heating. The object of this study is to find the optimum selection and operation of the system under the given resources. The measure of such optimum conditions is the EFFECTIVENESS, the concept of efficiency based upon the Second Law of Thermodynamics. The temperature of water to waste is identified as the most important parameter to be optimized. The analysis indicates that for high temperature resources (higher than about 425K) power generation yields the best performance and is therefore recommended. The heat pumps are recommended for the resource temperature less than about 327K. The heat pump assisted heating system shows its superiority for the very narrow temperature range (320K-330K) and thus the use of this system should be considered when the flow rate is very limited. thus the direct heating is appropriate for the temperature range of 330K-425K. The analysis also shows the optimum capacity of thermal water, which may be useful for the initial estimation of heating or power generation potentials of given resources.

본 논문에서는 순수한 액체상태의 온수 단위 질량을 대상으로 동력발생에서부 터 열펌프 까지의 가능한 응용을 고려하여 온도에 따른 최적 사용방법과 최대성능 발 휘시의 용량산정을 통하여 온수의 최적능력을 확인하고자 한다. 단 본 연구의 결과 는 순수히 열역하적인 것으로 경제적 관점에서 본다면 다소 다른 견해가 있을 수 있겠 으나 열역학적 및 경제적 관점 사이의 관계 및 제2법칙의 역할의 중요성은 이미 여러 논문에서 충분히 거론된 것으로서 여기서 언급하지 않는다.