可變冷媒流量系統運用於辦公類建築之年均權重性能係數分析

Annual Weighted Mean COP Analysis of Variable Refrigerant Volume System Applied to Office

黃庭裕(Ting-Yu Huang)

指導教授 ： 蔡尤溪

國立臺北科技大學/機電學院/機電整合研究所/碩士(2009年)

https://doi.org/10.6841/NTUT.2009.00018

摘要

我國對於空調系統冰水主機性能係數COP標準，採用經濟部能源局所公告之性能標準管制，但是對於窗型冷氣機或分離式冷氣機之設備性能係數標準EER值，並無規範部分負載情況下之性能係數，僅反映冷氣機在單一標準條件下所測得之性能效率，未考慮實際運轉時受到外氣及負載變動所造成之影響，無法真實反應出運轉之性能特性，造成一般民眾僅針對於標稱能力COP、EER值高低判斷性能效率良劣之迷失。
本研究以辦公類型建築物為主要分析對象，利用eQuest電腦模擬軟體分析逐時空調負荷，經由動態模擬結果，假設空調系統採用氣冷式定頻系統，與採用可變冷媒流量系統比較。氣冷式定頻系統由eQuest內建數值模擬輸出後，計算其月平均性能係數。可變冷媒流量系統則利用動態逐時之外氣溫度、室內回風溫度、空調負載率等數據，透過統計回歸分析，建立部分負載情況下之性能曲線。
將定頻空調系統與可變冷媒流量系統比較，在每月份不同負載率情況下之性能效率差異，發現平均每月份負載率大約介於30％∼80％之間。本研究模擬結果亦發現，比較直膨式定頻系統與可變冷媒流量系統月平均系統性能係數，差異大約介於10％∼40％。可變冷媒流量系統即是利用良好的變頻控制策略，隨者負載變動改變其製冷能力與消耗電功率，達到節省空調耗能目的，長期運轉下其省能效益將更為明顯。

關鍵字

可變冷媒流量系統 ； 部份負載效率 ； 動態模擬 ； 能源效率比值

並列摘要

For the energy performance of chillers in air conditioning systems, the Bureau of Energy, Ministry of Economic Affairs, has adopted an energy standard regulation. However, there is still no standard for partially load performance for the window-type or multi-split-type air conditioners.
The coefficient EER value only reflects the efficiency of an air conditioner under a single condition. It does not consider the influence of outdoor air conditions and load variation for the actual operation. Therefore in general, the confusion with the definition of COP and EER values distract from the actual efficiency of the systems.
This research focuses on analyzing the office buildings using eQuest computer program to simulate the air conditioning load. The dynamic simulation results are used to determine the energy consumed by air-conditioning units. In this study air conditioning system that used air-cooled fixed-frequency is compared to the VRV variable refrigerant system. After obtaining the output of Air-cooled fix-frequency system’s numerical simulating data, then calculate the monthly average functional coefficient. By using dynamic outdoor temperature, indoor temperature and air conditioner loading data, a statistical analysis can be made to build a performance curve for partially load.
By comparing the fixed-frequency air conditioning systems with VRV variable refrigerant flow system, under the monthly different load situation, we found that the average load is between 30% ~80%. The simulation results of this study also found that the difference of monthly performance coefficient of fixed –frequency system and variable refrigerant flow system is between 10% ~40%.
Based on this, it was concluded that the variable refrigerant flow system uses a variable frequency control strategy to change its refrigeration capability and consumption of electric power, so to achieve the energy saving purposes. The energy saving will be more pronounced under longer term operation.

並列關鍵字

Variable Refrigerant Volume system ； partial load ration ； dynamic modeling ； energy efficiency ratio

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