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。
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.