The development of energy recovery device (ERD) is a decisive factor for the recent prevalence of reverse osmosis (RO) technology in the seawater desalination field. Unlike broadly studied large scale ERDs, the investigations of small scale ERDs are scarcely reported, especially on the performance fluctuations under variable operating conditions. Based on an authors’ exploratory research on a piston type integrated high pressure pump-energy recovery device (HPP-ERD), further performance exploitation of the HPP-ERD is conducted. With a constructed experiment platform, the influences of inlet seawater temperature, inlet seawater salinity, as well as the operating frequency on the performance of the HPP-ERD coupled with seawater reverse osmosis (SWRO) desalination system are investigated. The temperature and salinity of the inlet seawater are numerically correlated with the specific energy consumption (SEC) of the HPP-ERD. With the correlated equation, the marine hydrological data of two observatories acquired from a national authoritative database, and the annualized life cycle cost approach incorporated, annual performance assessment is proposed for an SWRO desalination system equipped with the HPP-ERD in the light of energy and economic indices. The study results indicate that the proposed HPP-ERD is competent under various operating conditions for SWRO desalination systems.

能量回收装置（ERD）的发展是近期反渗透（RO）技术在海水淡化领域流行的决定性因素。与广泛研究的大型 ERD 不同，对小型 ERD 的研究很少见报道，尤其是在可变操作条件下的性能波动方面。在作者对活塞式一体化高压泵-能回收装置（HPP-ERD）的探索性研究的基础上，对HPP-ERD进行了进一步的性能开发。通过搭建的实验平台，研究了入口海水温度、入口海水盐度以及工作频率对HPP-ERD与海水反渗透（SWRO）脱盐系统性能的影响。入口海水的温度和盐度与 HPP-ERD 的比能量消耗 (SEC) 在数值上相关。结合相关方程，从国家权威数据库中获取两个观测站的海洋水文数据，并结合年化全生命周期成本法，针对配备HPP-ERD的SWRO海水淡化系统，从能源和经济指标。研究结果表明，所提出的 HPP-ERD 在 SWRO 海水淡化系统的各种运行条件下均能胜任。并结合年化生命周期成本法，结合能源和经济指标，对配备HPP-ERD的SWRO海水淡化系统提出年度绩效评估。研究结果表明，所提出的 HPP-ERD 在 SWRO 海水淡化系统的各种运行条件下均能胜任。并结合年化生命周期成本法，结合能源和经济指标，对配备HPP-ERD的SWRO海水淡化系统提出年度绩效评估。研究结果表明，所提出的 HPP-ERD 在 SWRO 海水淡化系统的各种运行条件下均能胜任。