中央空調系統之整合應用－－某教學醫院之節能與舒適成效

The Application of Integrated Design of Central Air- Conditioning Systems: Empirical Study of a Teaching Hospital’s Improving Energy Efficiency and Comfort

健保開辦以來，台灣民眾與政府對於醫療品質與環境的期待逐年上升，致使醫院不斷地更新醫療儀器與設備，以提供快速、準確的醫療服務與舒適、安全的就醫環境，讓醫院的耗能狀況更形嚴峻。故，針對醫院中耗電比率最大的中央空調系統為首要之改善重點，以整合院內空調主機與各冰水迴路及系統泵、冷卻水塔方式，使本院空調主機之運轉效能由20小時的低載效能提升至全天24小時皆有大於93%的高載效能。並於2012年2月1日至4月30日三個月的實際運作中證實，『冰水雙向環路系統』能依當天的氣溫變化供應院內各單位之空調需求，在不影響甚至提升室內空氣品質的狀態下，與去年同期（2、3、4月）相比，空調總用電度數從160萬度降為130萬度，一季省下約79萬元電費，且總用水量從3.85萬噸降為2.72萬噸，一季為醫院省下約14.4萬元水費，並為地球減少了190,606公斤的二氧化碳排放量。在整個案子完成以後約八個月，即將醫院所投入的金錢全數回收，真是既省錢又環保，此成果更激勵了整個團隊成員的士氣，讓團隊成員更加願意再次投入另一個改善作業。期盼本節能成功案例能提供國內其他同樣擁有老舊建築和多機空調之醫療院所參考。

In Taiwan, both government and general public’s expectation on medical quality and service environment has been arising year by year since the initiation of National Health Insurance program. This drives hospitals keep updating medical equipments and facilities in order to provide both a more rapid and precise medical service and a more comfortable and safer service environment. Such trend has made hospital become more power hunger. This study aims to improve the energy efficiency of hospital’s centralized air-conditioning system, the top power consumer in hospital. Through integrating all air-conditioning system including compressors, chilled-water piping system, system pumps, and cooling towers, the operation efficiency of airconditioning system had improved from 20-hours low energy efficiency to 24-hours-over 93% high energy efficiency. The results of three months of operation has confirmed that the doubled chilled-water loop system could maintain or even improve indoor air quality by adjusting indoor air-condition demand based upon concurrent outdoor temperature. The air-condition power consumption volume of February to April, 2012 has reduced 18.75%. The saving in electrical bill was NTD790,000 per quarter. Meanwhile, the water consumption in cooling towers has reduced 29.35%. The saving in water bill was NTD14,400 per quarter. The total reduction in carbon dioxide emission was 190,606 Kgs. The estimated ROI (Return on Investment) of this project was 8 months. The project team members were motivated by the very satisfactory preliminary results. Hopefully, the energy saving experiences of this project can be of reference to hospitals and organizations with aged buildings and multiple air-condition systems.