The objective of this study is to investigate the energy savings and economics of the hot water supply system for the luxury resort. The hot water was generated using the waste heat from the exhaust gas heat (EGH) of internal combustion engine (ICE) installed at the luxury resort. The capacity and characteristics of waste heat source, flow demand and supply system of hot water were surveyed, and data is collected from the real system. The new heat exchanger system which utilizes the EGH to produce the hot water is designed considering the dew point temperature and the back pressure of exhaust gas system. The results show that the proposed system could supply hot water at a temperature of 55 °C corresponding to the present resort demand of 6 m³/h using EGH of ICE at 20% load. The proposed system could achieve the saving of 400 L/day in diesel oil (DO) fuel consumption and the payback time of new system could be evaluated as 9 months. The proposed system could produce hot water of 14 m³/h at 25% of engine load and 29 m³/h at full engine load which are sufficient to satisfy the regular and maximum hot water demand of resort. The presented results show the capability of the proposed system to satisfy the current hot water demand of resort and suggest the larger potential to save energy by recovering EGH of ICE. The novelty of the present work involves detailed methodology to design heat exchangers and evaluate system economics for hot water supply system based on EGH of ICE.

中文翻译：

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度假村余热回收热水供应系统的节能与经济评价。

这项研究的目的是研究豪华度假村热水供应系统的节能和经济性。热水是由豪华度假村内安装的内燃机（ICE）的废气热（EGH）产生的废热产生的。调查了废热源的容量和特性，热水的流量需求和供应系统，并从实际系统中收集了数据。利用EGH产生热水的新型换热器系统是在考虑露点温度和排气系统背压的情况下设计的。结果表明，所提出的系统可以在55°C的温度下供应热水，相当于目前的度假需求6 m ³/ h使用ICE的EGH（负载为20％）。拟议的系统可以节省400升/天的柴油（DO）燃料消耗，新系统的投资回收期可以评估为9个月。所提出的系统在25％的发动机负荷下可产生14 m ³ / h的热水，而在全发动机负荷下可产生29 m ³ / h的热水，足以满足常规和最大的热水需求。给出的结果表明，所提出的系统能够满足当前度假胜地的热水需求，并表明通过回收ICE的EGH具有更大的节能潜力。本工作的新颖性涉及基于ICE的EGH设计热交换器和评估热水供应系统的系统经济性的详细方法。