The gas compressed by the compressor is first cooled in the condenser, to the cooling water (or air) to release heat, and then flow through the return heaters by the return gas is further cooled, and into the adiabatic expansion of the expander, the pressure and temperature of the compressed gas at the same time down. Gas expansion in the expander when the external work, become part of the compressor input power.
At the same time, the expanded gas enters the cold box, absorbing the heat of the cooled object, that is, to achieve the purpose of refrigeration. Thereafter, the gas returns through the return heaters, with the heat exchange of compressed gas and then into the compressor is compressed.
Expanded Information:
. p>I. Structural characteristics:
1. High requirements, do not allow inward and outward leakage. Therefore, large and medium-sized refrigeration compressor in the main shaft out of the body are equipped with shaft seal, small refrigeration compressor is made into a semi-closed or fully closed.
Semi-hermetic compressor is usually the body and motor casing into one, or will be connected with a flange. Totally enclosed type is also limited to small reciprocating compressor and rolling rotor compressor, with a hermetically sealed steel casing to the compressor and motor closed up, generally do not dismantle the repair.
2, freon can be dissolved in lubricating oil, so often in the crankcase oil pool equipped with a heater. Some screw compressors and rolling rotor compressor with oil injection method to realize the machine sealing and cooling, in addition to the oil injection device is also equipped with a high-efficiency oil separator.
3, the compressor inhalation is saturated vapor. Ammonia gas is easy to carry liquid, so the reciprocating ammonia compressor is equipped with a safety cover to prevent liquid shock.
4, multi-stage compression at all levels of flow is not the same, so the multi-stage centrifugal compressor and screw compressor are mostly equipped with intermediate gas supply system, coupled with the power saver, in order to improve the operating economy of the refrigeration machine.
Two, energy-saving methods of refrigeration:
1, energy-saving principles of refrigeration
Improve the evaporating temperature, reduce the condensing temperature. Under the premise of meeting the equipment safety and production requirements, try to increase the evaporation temperature and reduce the condensing temperature. To this end, the cooling tower has been increased to ensure the transformation of cooling water efficiency.
2, prevent and reduce pipeline scaling
To improve the heat transfer efficiency of the condenser and evaporator of the supplemental water if the water treatment is not done well, calcium bicarbonate and magnesium bicarbonate produced by the heat of the calcium carbonate and magnesium carbonate will be deposited on the pipeline. Make the thermal conductivity decline, affecting the condenser and evaporator heat transfer efficiency, and make the equipment operation electricity costs rise substantially. At this time, in addition to the use of water treatment technology, you can also use the pipeline regular automatic cleaning equipment for pipeline cleaning.
3, adjust the refrigeration equipment reasonable operating load
In the case of ensuring the safe operation of equipment, refrigeration host running at 70% -80% load than running at 100% load, the unit of cold power consumption is smaller. The use of this method of power on the combination of water pumps, cooling towers, the operation of a comprehensive consideration.
Baidu Encyclopedia - Compression Chiller
Baidu Encyclopedia - Refrigeration Machine