Abstract
With the cost of energy rising, the value of conservation grows. Interest in energy efficiency could be a sound investment or a necessary public policy. Heat pump systems provide economical alternatives of recovering heat from different sources for use in various applications. The objective of this study is to present the strategic approach on the energy efficient analysis of the water heating system retrofitted by applying a heat pump system in the dormitory of a university. Energy savings were determined by comparing field measurements of water consumption, water temperature and power consumption of the overall system before (electric resistance heating system) and after (heat pump heating system) the implementation of this project. Furthermore, the building energy simulation code (eQuest) has been applied to verify and predict the long-term energy consumption for both water heating systems. The results from energy modelling revealed the good agreement for energy simulation and field measurement data and the improvement of energy efficiency and energy savings could be achieved satisfactorily by retrofitting of a heat pump system. The energy conversion efficiency of hot water for energy consumption at 0.63 (Mcal/Mcal) could be achieved after the application of heat pump water heating system. It also presented the annual saving about USD 20,000 (NTD 600,000) for the dorm by using a heat pump heating system under the electrical billing rate of Taiwan.
Highlights
The increasing cost of fuel and global warming attention necessitate a constant reevaluation of the water heating system even in a tropical area
Franco [2] analyzed the optimal sizing of a particular solution for renewable energy residential building integration by combining a photovoltaic (PV) plant with a heat pump
Okamoto [4] investigated a heat pump system with a latent heat storage utilizing seawater installed in an aquarium
Summary
The increasing cost of fuel and global warming attention necessitate a constant reevaluation of the water heating system even in a tropical area. Heat pump heating systems provide economical alternatives by recovering heat from different sources in various applications. A comprehensive review of the various methods for improving the performance of heat pump was investigated [1]. Many hybrid heat pump systems suitable for different applications with various heat sources have been reported as well. Berntsson [3] extensively discussed the heat sources for the heat pump application of building and industry in Sweden from the aspects of technology, economy and environment. Osterman [5] presented an extensive review of different kinds of heat pump system for the heating and cooling of buildings with a focus on heat pumps with thermal energy storage. The measurement of the energy performance of air-to-water and water-to-water heat pumps in hotel applications in subtropical climates has been investigated [6]. The results presented heat pumps were financially feasible with payback period of about two years
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