Waste Heat Recovery from Central AC System for Hot Water Supply; A Case Study for Hotel Building Application in Indonesia

This paper studied integration of heat pump and air conditioning systems to provide heating for hot water as well as cooling for hotel services based on weather conditions and energy costs in Indonesia. The paper also analyzed environmental impact and investigated economical aspect of such system in comparison with conventional technology consisting separate hot water boiler and air conditioning system. The study was conducted for a five star hotel of 636 rooms, 30 apartments and 25 meeting rooms. The results showed that optimum arrangement of the integration could reduce 36.7% energy consumption for space cooling and hot water supply. This accounted for about 6.6% of total energy use of the hotel. The investigated system was found to be economically viable for hotel application with energy cost reduction for air conditioning and hot water supply systems of 34.4%. The system could also provide reduction on the environmental impact.