機組特點
中央系統冰水機組各國都訂定了能源效率的國家標準，但僅限於滿載運轉時需達到的標準，而在一年當中季節及早晚氣溫變化很大，所以冰水主機真正處在滿載運轉的時間僅佔5%，依美國ASHRAE資料顯示：一般辦公大樓一年內空調負載在50%負載的約佔4,500小時，在75%負載約佔4,000小時，一整年總時數不過8,760小時，如果冰水主機的部份負載時間超過8,000小時，不去好好的節省耗電，是非常浪費的。
揚帆冷氣公司與國立台北科技大學能源與冷凍空調研究所共同開發了『變頻滿液式冰水機組』，它不但在滿載時完全符合國家定訂的能源效率標準，當部份負載（Integrated Part Load Value【IPLV】）時，其性能係數（COP值）亦超過美國冷凍空調協會（ASHRAE）最新2004年標準。
茲介紹本系列機組主要機件及優點如下：
■壓縮機：專用變頻式冷媒壓縮機，可依負荷大小，由變頻器使電源自30Hz~60Hz作無段變能量，以減少耗電量。
■變頻器：穩定而可靠的交流馬達驅動變頻器，它接受負荷的增減，令電源頻率及電流增加或減少。
■油氣分離器：特殊結構的油氣分離器，能將壓縮機運轉時拋出之高壓氣體冷媒挾帶著冷凍油完全分離，使純淨的冷凍油返回壓縮機。讓壓縮機潤滑系統保持正常。
■冷凝器：採用管殼式，筒身及高效率多鰭麻繩式紫銅管，高溫冷媒在筒身內以雨淋方式噴灑在銅管外，冷卻水在銅管內擾流、滾動，使冷熱交換產生最佳效果。
冷媒側試驗壓力為25Kg/m2，水側試驗壓力為10Kg/m2。
■蒸發器：採用管殼式，筒身及滿液式高效蒸發專用銅管，能使低壓冷媒在蒸發器內完全蒸發，加速產生製冷效果。
冷媒側試驗壓力為
■冷媒流量控制：採用電磁式電子膨脹閥，依負載或氣候變化，精準的控制冷媒流量，使冷媒始終保持在一定的液面，防止液體冷媒過與不及，不致造成壓縮機液壓縮而損壞。
■人性化操控管理：採用PLC可程式控制，具備自動啟動前檢查、警報記錄及自我診斷功能，精確控制蒸發器回水或出水之溫度。採觸控式液晶中文顯示之LCD人機介面、網路監控連線及數位化溫度、壓力、耗電量等感測。內建萬年曆及時間功能，可設定整年假日與非假日之開機/停機時間，並記錄運轉狀況、運轉時數與維修保養預警，有效提升系統管理。
對溫度、壓力、過載，防止壓縮機頻繁啟動、逆向運轉等作最有效保護，當機組滿載或部份負載時，皆能保持高效率、安全及穩定之運轉。
■免除超負荷投資：本系列機組因為有減頻和超頻能力，所以採用雙壓縮機者在15%負載下仍能運轉；採用單壓縮機者可允許在滿載情況下增加25%的冷房能力，免除超負荷規劃及減少投資費用。
FEATURES OF THE CHILLER UNIT
For the central system chiller unit, each country has stipulated a national standard of energy source efficiency; however, this standard is limited to the working of the chiller at its full loading level. Practically, the temperature is greatly changed during the different seasons and the day or night time, so the actual full loading operation time occupies only 5% of the chiller operation time. According to the American ASHRAE data, in a general office building, the air conditioning operation time at 50% loading in the whole year is nearly 4,500 hours, and at 75% loading, 4,000 hours; the total operation time is under 8,760 hours in the whole year. In case the operation time at partial loading is over 8,000 hours cannot be put under the consideration of saving power consumption, it is an extraordinary waste.
YANGFAN Air-conditioning Company, together with the Department of Energy and Refrigeration Air-conditioning Engineering National Taipei University of Technology has mutually developed, namely, “VFD Flooded Type Chiller Unit”. Not only this type of chiller is designed completely in accordance with the National Energy Source Efficiency Standard, but its Coefficient of Performance (COP) at the Integrated Partial Load Value (IPLV) is also over the ASHRAE standard issued in 2004.
We introduce the main components of this series of chiller units and their advantage as follows,
■Compressor: Use VFD type refrigerant compressor according to the quantity of loading to non-stage vary the power source from 30Hz to 60Hz by VFD to minimize the power consumption.
■VFD: Stable and reliable AC motor driven VFD, which accepts the loading burden by increasing or decreasing to plus or minus the frequency of power source and electricity current.
■Oil Separator: Special structured oil separator, which separates the refrigeration oil completely from the high pressure gas refrigerant thrown out by the revolution of the refrigerant compressor, and carries the pure and clean refrigeration oil back to the compressor to maintain the compressor lubricating system always normal.
■Condenser: Use shell and tube type. The body of the condenser is made of premium steel tube with high efficient multi-finned spiral copper tubes inside. High temperature refrigerant in the body of the condenser uses the shower form spraying to the outside of the copper tube while the cooling water in the copper tubes is running in turbulence and rolling to ensure the best heat exchange effect. The test pressure is 25Kg/㎡at refrigerant side, and 10 Kg/㎡at water side.
■Evaporator: Use shell and tube type body and flood type high efficient special coppers for evaporating inside to make the low pressure refrigerant evaporated completely in the evaporator and speed the produced cooling effect. The test pressure is 17 Kg/㎡at refrigerant side, and 10 Kg/㎡at water side.
■Refrigerant Flow Control: Use the magnetic type electronic expansion valve and according to the variety of load or climate to precisely control the refrigerant discharge and keep the refrigerant always at a certain liquid level to prevent from too much or too little liquid refrigerant to avoid the occurring of liquid compression in the compressor and damage to the compressor.
■Humanized Management Control: Adopt PLC programming control intelligent unit to perform a series of pre-start checks, alarm recording and self-diagnosing and have the processing of the evaporator returning or leaving water temperature precisely controlled. Using touch control human-machine LCD interface displayed in English, network monitoring and digital temperature sensors, pressure sensor, power meter, etc. The in-built perpetual calendar and clock help you to set the time to start or stop the chiller unit on holidays or non-holidays, and help you to record the unit working status, running hours and notice the maintenance alarm to keep the system managed efficiently. The unit is protected from high temperature, high pressure, compressor frequently ON/OFF and compressor running in reverse so as to keep the operation safely and stable with high efficiency no matter running at full load or partial load.