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When to use a cooling tower
performance advantage of cooling towers and evaporative condenser is that the condensing temperature can reach ambient temperature wet-bulb temperature. Because the wet-bulb temperature is always equal to or less than dry bulb thermometer temperature in the cooling system can work with below the temperature of condensation and thus energy savings compared to air-cooled condenser. The absence of cooling tower that maintenance costs tend to be higher than for an air-cooled condenser and attention must be given to preventing the water from freezing in the cooling tower if surgery is necessary in cold weather. ....
 
Types of heat pumps
All refrigeration systems and heat pumps, as they absorb heat energy at a low temperature, level and flow of water at high temperature. Designation heat pump, however, has developed around the use of the cooling system where the heat rejected at the condenser is used instead of simply being dispersed in the atmosphere. There are certain applications, and cases when the heat pump can be useful cooling and useful heat output, and it certainly is a winning situation. ....
 
Capillary tubes
capillary tube serves almost all small refrigeration systems and its scope covers the refrigerating capacity of 10 kW. Capillary tube from 1 to 6 m with inner diameter, usually from 0.5 to 2 mm the Name is a misnomer, because suffered too large to allow the capillary effect. Liquid refrigerant enters the capillary tube, and as it flows through the pipe, the pressure drops due to friction and acceleration of the refrigerant. Some liquid flashes into steam, refrigerant passes through the tube. ....
 
How the various types of compressors share the field
four types of compressors studied in this Chapter, piston, screw, vane, and centrifugal, all were somewhat different qualities, so that for each type found application in areas where it has advantages over others. A fairly accurate statement, in which compressors can be used based on their cooling capacity. Piston compressors dominate with a very small cooling capacity of 300 kW. Centrifugal compressors are the most widely used for refrigeration units with a capacity of 500 kW and above. Screw compressor has found its niche in the 300-500 kW of power and competes from large reciprocating compressors against small and centrifugal compressors. Compressor blades competes with reciprocating compressors, primarily, on the market of household refrigerators and air conditioners. ....
 
Hermetically sealed compressors
compressor, whose cranked shaft passes through the compressor casing so that the engine can be externally connected with the shaft is called open-type compressor. The seal shall be used in cases where the shaft comes through the compressor housing, to prevent leakage of refrigerant gas or air leakage in the case of a crankcase pressure below atmospheric pressure. Although designers are constantly developed better, seals, piercing accommodation is always a source of leakage. To avoid leakage print engine and compressor often enclosed in a single package. ....
 
Types of compressors
Each of the four components of the steam-compression systemcompressor, condenser, expansion unit and the evaporator has its special behavior. At the same time, each component is influenced by the conditions imposed by the other members of the " Quartet". Changes in the condenser-water temperature, for example, may change the rate of refrigerant in the compressor, pumps, which, in turn, may require the expansion valve, how to rebuild and refrigerant in the evaporator pressure changes. We must study the components of the vapour-compression cycle alone, the analysis of their efficiency as individuals, and then observe how they interact with each other as a system. Compressor first component analysis. ....
 
Freeze protection
If the water in the Bay freeze, coiled tubing can burst, causing the cost of repair coil, disruption of service, and possibly water damage to the building. Water in the Bay can be frozen due to the cold air, cooling of certain metal surfaces below the freezing point of water. Protective device called freezestat must be installed on all the lines that are likely to be vulnerable to freezing conditions. It is a long, flexible tube that is attached to the exit face of the coil. If a small extent (about 15 cm), phone falls to a temperature of 0C, freezestat opens the electric switch is included in the system, which takes at least two things: (1) disables fans and (2) closes an open-air and exhaust dampers.....
 
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