18 May 2017

P.3.7.8 Experimental study of lab-scale steam generation heat pump with waste heat recovery

Steam is one of the most commonly used energy form in industrial factories for manufacturing processes and it takes about 40% of industrial energy use. After process, liquid water remains as a form of waste heat and it needs to be cooled before exhaust because the temperature of hot liquid water is still high ranging from 50 to 90°C. This cooling process requires additional energy. Introduction of a heat pump system which can generate steam using this waste heat has a positive effect on both additional steam generation and waste heat recovery from hot liquid water. Steam is usually generated through boiler, but the heating capacity of boiler never can exceed the capacity of input energy. On the other hand, heat pump can usually generate several times more heat compared with the input energy. Therefore, in this study, a lab-scale steam generation heat pump system is designed and experimental results are shown in order to verify the performance of the system. It is concluded that coefficient of performance and heating capacity increase 1.25 and 1.8 times respectively as heat source temperature rises from 60 to 80°C. Optimal operational point of the system is found and the performance at this condition was also verified.