Retrofit

改造策略	用更高效的冷水機更換現有低效冷水機
	現有冷水機的效率往往於操作數年後下降。隨著技術進步，最新一代冷水機的效率更高，並且具有不同的性能特點以應付各種操作狀況和條件。應監察現有冷水機的效率，並計劃在有合理改進機會時進行更換。
	考慮
	將冷水機的效率與最新的《建築物能源效益守則》進行比較。檢討現有系統的冷卻負載狀況並確定新的冷水機組合。新的組合可能由不同容量、恆速和 / 或可變速的冷水機組成，以最好地去配合系統的負載狀況。一個匹配不同類型冷水機性能特點的良好組合，可以優化冷水機組的效率。在可行的情況下，使用水冷式冷水機。安裝能源計量裝置
	預計節省
	(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 請點擊此處查看術語清單。（只提供英文版）

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