Retrofit

改造策略	用更高效的冷水机更换现有低效冷水机
	现有冷水机在运行几年后效率会下降。随着技术的进步，最新一代冷水机的效率更高，并具有不同的性能特点，以适应不同的运行工况和条件。应监测现有冷水机的效率，并计划在有合理的改进机会时进行更换。
	考虑
	将冷水机的效率与最新的《建筑物能源效益守则》进行比较。审核现有系统的冷却负荷曲线，确定新的冷水机组合。新的组合可能包括不同容量的冷水机和恒速和/ 或变速冷水机，以最佳地匹配系统的负载情况。与不同类型冷水机的性能特点相匹配的良好组合可以优化冷水机组的效率。如果可能，使用水冷式冷水机。安装能耗计量装置。
	预计节省
	(1/COP_CH_PRE – 1/COP_CH_POST) QBLDG OPHR,yr Where COP_CH = 0.605COP_CH_SM + 0.395COP_CH_WN COP_CH_SM = (COPa_SM + COPb_SM)/2; COP_CH_WN = (COPa_WN + COPb_WN)/2 QBLDG = 0.605[0.77(0.88NCH_SMQCH_SM + 0.12NCH_WNQCH_WN)] + 0.395[0.596(0.184NCH_SMQCH_SM + 0.816NCH_SMQCH_SM)] OPHR,yr = hr/dayday/wk52 For CSD_WSS: COPa_SM = COP_CH_75% + (COP_CH_100% – COP_CH_75%)(0.77 – 0.75)/(1 – 0.75) COPb_SM = COP_CH_75% + (COP_CH_100% – COP_CH_75%)(TWCC_SM – 23.9)/(29.4 – 23.9) COPa_WN = COP_CH_38% + (COP_CH_75% – COP_CH_38%)(0.596 – 0.375)/(0.75 – 0.375) COPb_WN = COP_CH_38% + (COP_CH_75% – COP_CH_38%)(TWCC_WN – 18.3)/(23.9– 18.3) For VSD_WSS: COPa_SM = COP_CH_75% + (COP_CH_100% – COP_CH_75%)(0.67 – 0.75)/(1 – 0.75) COPb_SM = COP_CH_75% + (COP_CH_100% – COP_CH_75%)(TWCC_SM – 23.9)/(29.4 – 23.9) COPa_WN = COP_CH_38% + (COP_CH_75% – COP_CH_38%)(0.496 – 0.375)/(0.75 – 0.375) COPb_WN = COP_CH_38% + (COP_CH_75% – COP_CH_38%)(TWCC_WN – 18.3)/(23.9 – 18.3) For CSD_ASS: COPa_SM = COP_CH_75% + (COP_CH_100% – COP_CH_75%)(0.77 – 0.75)/(1 – 0.75) COPb_SM = COP_CH_75% + (COP_CH_100% – COP_CH_75%)(TACC_SM – 26.7)/(35 – 26.7) COPa_WN = COP_CH_38% + (COP_CH_75% – COP_CH_38%)(0.596 – 0.375)/(0.75 – 0.375) COPb_WN = COP_CH_38% + (COP_CH_75% – COP_CH_38%)(TACC_WN – 15.6)/(26.7– 15.6) For VSD_ASS: COPa_SM = COP_CH_75% + (COP_CH_100% – COP_CH_75%)(0.67 – 0.75)/(1 – 0.75) COPb_SM = COP_CH_75% + (COP_CH_100% – COP_CH_75%)(TACC_SM – 26.7)/(35 – 26.7) COPa_WN = COP_CH_38% + (COP_CH_75% – COP_CH_38%)(0.496 – 0.375)/(0.75 – 0.375) COPb_WN = COP_CH_38% + (COP_CH_75% – COP_CH_38%)(TACC_WN – 15.6)/(26.7– 15.6) Where COP_CH_38% = COP_CH_50% + COP_CH_50% TACC_SM = 28.8, TACC_WN = 21.2, TWCC_SM =28.5, TWCC_WN = 25.0 请点击此处查看术语清单。（只提供英文版）

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