注意要點(diǎn)
▲ 螺桿式冷水機(jī)的主要控制參數(shù)為制冷性能系數(shù)，額定制冷量，輸入功率以及制冷劑類型等。
▲ 冷水機(jī)組的選用應(yīng)根據(jù)冷負(fù)荷及用途來考慮。對于低負(fù)荷運(yùn)轉(zhuǎn)工況時(shí)間較長的制冷系統(tǒng)，宜選用多機(jī)頭活塞式壓縮機(jī)組或螺桿式壓縮機(jī)組，便于調(diào)節(jié)和節(jié)能。
▲ 選用冷水機(jī)組時(shí)，優(yōu)先考慮性能系數(shù)值較高的機(jī)組。根據(jù)資料統(tǒng)計(jì)，一般冷水機(jī)組全年在99%負(fù)荷下運(yùn)行時(shí)間約占總運(yùn)行時(shí)間的1/4以下?？傔\(yùn) 行時(shí)間內(nèi)99%、75%、50%、25%負(fù)荷的運(yùn)行時(shí)間比例大致為2.3%、41.5%、46.1%、10.1%。因此，在選用冷水機(jī)組時(shí)應(yīng)優(yōu)先考慮效率曲線比較平坦的機(jī)型。同時(shí)，在設(shè)計(jì)選用時(shí)應(yīng)考慮冷水機(jī)組負(fù)荷的調(diào)節(jié)范圍。多機(jī)頭螺桿式冷水機(jī)組部分負(fù)荷性能優(yōu)良，可根據(jù)實(shí)際情況選用。
▲ 選用冷水機(jī)組時(shí)，應(yīng)注意名義工況的條件。冷水機(jī)組的 實(shí)際產(chǎn)冷量與下列因素有關(guān)：
A)冷水出水溫度和流量;
B)冷卻水的進(jìn)水溫度、流量以及污垢系數(shù)。
▲ 選用冷水機(jī)組時(shí)，應(yīng)注意該型號機(jī)組的正常工作范圍，主要是主電機(jī)的電流限值是名義工況下的軸功率的電流值。
▲ 在設(shè)計(jì)選用中應(yīng)注意：在名義工況流量下，冷水的出口溫度不應(yīng)超過15℃，風(fēng)冷機(jī)組室外干球溫度不應(yīng)超過43℃。若必須超過上述范圍時(shí)，應(yīng)了解壓縮機(jī)的使用范圍是否允許，所配主電機(jī)的功率是否足夠。
▲ Screw the main control parameters for the chiller cooling coefficient of performance, the rated cooling capacity, input power and the type of refrigerant.
▲ Chiller selection should be based on the cooling load and use to consider.Low-load operation conditions for longer periods of time cooling system,should use more head piston compressor or screw compressor, easy to adjust and energy.
▲ Selection of chillers, priority is given a higher coefficient of performance of the unit. According to statistics, the annual general chillers running at 99% load, the total time to run time of 1/4 or less. The total running time of 99%, 75%, 50%, 25% load ratio of the running time of roughly 2.3%, 41.5%, 46.1 %, 10.1 %. Therefore, the choice should be given priority chillers relatively flat efficiency curve models. Meanwhile, the selection should be considered in the design chiller load adjustment range. Multi-head screw chiller part-load performance, can be selected according to the actual situation.
▲ Selection of chillers, the state should pay attention to volunteers conditions.
Actual chiller cooling capacity with the following factors:
A) cold water temperature and flow;
B) cooling water inlet temperature, flow, and fouling factor.
▲ Selection of chillers, the unit should be noted that the model of the normal scope of work, mainly the main motor current limit is the nominal operating conditions of the shaft power of the current value.
▲ Use in the design should pay attention: in the name of flow conditions, the cold water outlet temperature should not exceed 15℃, the outdoor dry bulb temperature air-cooled unit should not exceed 43℃. If you need more than the above range, should be aware of whether to allow the use of the compressor, the main motor with the power is adequate.
特點(diǎn)
▲ 機(jī)組采用智慧型微電腦觸摸屏+PLC控制系統(tǒng)。
▲ 采用高效進(jìn)口螺桿壓縮機(jī)、選用優(yōu)質(zhì)的蒸發(fā)器和冷凝器，采用加工工藝。
▲ 具有多種機(jī)組運(yùn)行安全保護(hù)措施，保證機(jī)組運(yùn)行及客戶的安全。
▲ Unit using intelligent touch screen + PLC microcomputer control system.
▲ Imported high-efficiency screw compressors, high quality of the evaporator and condenser, using advanced processing technology.
▲ With a variety of units are safe and protection measures to ensure the safety of plant operation and customers.
