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A Cost-benefit Analysis of Water Supply Pump Replacement in Buildings of Hong Kong

机译：香港建筑物供水泵更换的成本效益分析

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Energy efficiency of water supply systems in buildings becomes a concern for sustainable development nowadays.Aged, poor maintained and mismatched water pumps operating at low efficiency are highly undesired situations that can cause energy loss in water supply systems.This paper investigates in-use water pump efficiency and the associated energy cost for water supply systems in high-rise buildings of Hong Kong.Energy consumptions of water supply pumps are measured with the pump efficiencies determined from the water consumptions in 20 water supply systems in buildings.This paper presents expressions of in-use pump efficiency as a function of pump age and the associated energy cost is predicted against the pump installation cost.Pump replacement schedule is proposed with justification by the installation cost against the energy cost saving.The results show that a larger system could be benefited by a more frequent pump replacement schedule as compared with the ones of smaller pumps.The cost benefit is also observed for the worst scenarios of pump efficiency drops.The benefit isobvious as pump energy cost is high as compared with the installation.
机译：如今，建筑物供水系统的能源效率已成为可持续发展的关注点。老化，维护不当和不匹配的低效率运行的水泵是非常不希望的情况，可能会导致供水系统的能量损失。本文研究了使用中的水泵香港高层建筑供水系统的能源效率和相关的能源成本。供水泵的能耗是根据建筑中20个供水系统的用水量确定的泵效率来测量的。泵效率随泵寿命和相关能源成本的变化与泵安装成本之间的关系进行了预测。提出了更换泵的时间表，并根据安装成本与节能量之间的关系提出了合理的建议。结果表明，大型系统可以从中受益与较小型泵相比，泵更换时间表更为频繁。在泵效率下降的最坏情况下也观察到了成本收益。由于与安装相比，泵的能源成本高，因此收益是显而易见的。

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