工業技術研究院

技術簡介

低壓冷媒的離心式冰水機系統具有高製冷效率，而由於其運轉時的蒸發器壓力會低於大氣壓力，外界如空氣之不凝結氣體(Non-condensable gas, 簡稱NCG)將滲入系統內而影響其製冷能力與效率，因此需設置排氣裝置(Purge unit)，排除系統內的不凝結氣體。 本技術設計開發一套應用於R1233zd低壓冷媒離心式冰水機系統之不凝結氣體排氣裝置原型機，進行排氣裝置原型機之系統控制及功能驗證測試並分析其排氣成分，實驗中使用氮氣作為不凝結氣體，並於排氣裝置之淨化槽內，調配不同體積濃度之冷媒蒸氣與氮氣混合氣體，並藉由改變混合氣體溫度（22.5°C、30°C、38°C）以模擬冰水機系統運行之實際條件，最後探討不凝結氣體濃度對熱交換器性能以及對排氣裝置壓縮機吸氣溫度之影響。

Abstract

Centrifugal chiller systems using low-pressure refrigerant have higher energy efficiency. However, its evaporating pressure during operation will be lower than atmospheric pressure. The non-condensable gas (NCG), such as air from the atmosphere will infiltrate into the system affecting its cooling capacity and efficiency. Therefore, a purge unit is required to remove the NCG from the system. This technology conducts system control and functional verification test on a developed prototype purge unit for a centrifugal chiller system using low-pressure refrigerant R1233zd by analyzing its exhaust composition. In the experiment, nitrogen was used as the NCG. A mixture of refrigerant vapor and nitrogen at varying volume concentrations was prepared in the exhaust tank of the purge unit. The actual operating conditions of the chiller system were simulated by varying the temperature of the mixed gas. Finally, the effects of the NCG concentration on the performance of the heat transfer performance and the suction temperature of the compressor of the condensing unit were investigated.

技術規格

1. 冷凝單元：全密式壓縮機、冷凝風扇盤管； 2. 工作流體：R134a/R513A/R404A冷媒； 3. 膨脹裝置：定壓式膨脹閥； 4. 淨化槽：殼圈式熱交換器附冷媒液位偵測器 5. 系統控制：國產PLC控制器與觸控人機介面 6. 功能：手動/自動排氣操作

Technical Specification

1. Condensing unit：hermetic compressor and fan-fin coil condenser 2. Working fluid: R134a/R513A/R404A refrigerant 3. Expansion device: constant evaporation expansion valve 4. Purge tank: shell and coil evaporator with liquid level sensor 5. System controller: Programmable logic controller and touch panel HMI 6. Function: Optional Manual/Automatic operation

技術特色

專用設計的淨化槽應用小型冷凝單元(Condensing unit)使設置於淨化槽內的蒸發盤管產生-20℃以下的低溫表面，將引入淨化槽內之不凝結與冷媒氣體混合物中的冷媒氣體於蒸發盤管表面凝結，而使之與不凝結氣體分離。並藉由感測冷凝單元之壓縮機吸氣溫度，來進行淨化槽內不凝結氣體累積量的判斷，進行智慧化的排氣操作。

應用範圍

工作流體為低壓冷媒R123、R1233zd、R514A之離心式冰水機系統，進行進入系統內之不凝結氣體之分離與排除，以維持低壓冷媒離心式冰水機系統之效能。

接受技術者具備基礎建議（設備）

壓縮機與冰水機製造、安裝工程與維修保養相關設備。

接受技術者具備基礎建議（專業）

壓縮機與冰水機製造、安裝工程與維修保養相關專業。

聯絡資訊