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Analysis of refrigeration equipment functioning, how to be more efficient?
Release time:2016-10-21 10:59:26
Economic analysis on the refrigeration system operation
Refrigeration equipment refrigerating effect, directly related to the working conditions and system for the same platform, speed, refrigerant compressors of the specieshave been identified, as operating conditions change, operations management is different, its cold production and energy consumption are changing.
1. with the evaporation temperature drops, increasing the compression ratio of thecompressor and refrigerating effect energy consumption increase. When the evaporation temperature of 1 ℃, more power consumption of 3%-4%. Minimize the evaporation temperature, increasing the evaporation temperature, not only saves power consumption, can also increase the relative humidity of cold.
2. with the condensation temperature increases, increasing the compression ratio of the compressor unit increased energy consumption of refrigerating effect. Betweenthe condensing temperature at 25 ℃-40 ℃, per 1 c, increased power consumption is around 3.2%.
3. the condenser and evaporator of heat when the surface is covered with oil, can cause condensation temperature, evaporation temperature, result in reduced electricity consumption and increased production cold. Deposition on the inner surface of the condenser when there are 0.1mm thick layers, will make the compressor cooling capacity declined by 16.6, power consumption increased by 12.4 0.1mm when thick layers of accumulated on the evaporator surface oil, in order to maintain the low temperature required, evaporating temperature down 2.5 c, power consumption increase of 9.7.
4. when the clustered inside the condenser when the air will cause condensation pressure, non condensed gas pressure up to 1.96105Pa, the compressor power increased to 18.
5 when the condenser pipe incrustation reached 1.5mm, the condensing temperature rise of 2.8 degrees before the temperature scale, power consumption increase of9.7.
6 covered with a layer of frost on the surface of the evaporator, the heat transfer coefficient, especially when fin-and-tube frosting, which increases the thermal resistance of heat transfer and air flow between the fins, reduction of exterior heat transfercoefficient and heat. When the room temperature is lower than 0 ℃, the evaporatorcoil temperature is 10 ℃ on both sides, evaporator after a month of work, the heat transfer coefficient is about about 70 before the frost.
7 compressor suction gas to allow a certain degree of superheat, but the superheatis too large, the specific volume of gas increases, lowering the volume of its cold, relative increases in power consumption.
8 compressor to creams quickly turn down the suction valve, dramatically reduce the amount of cold, the relative increase in power consumption.
Based on the above analysis, refrigeration equipment handling, an important component is to improve the economic efficiency of cooling system.
Energy saving measures for cooling operation
1. strengthening equipment management, power management and consumption statistics system established. Power consumption and facilitate assessment of materialconsumption quota, increase the necessary instruments and instruments of measurement, energy-saving and technical reconstruction, institutionally consolidated energy saving work.
2 correct operation and maintenance of refrigeration equipment
1, the right control and regulating systems for liquid and avoid wet and overheatingof the compressor suction.
2, rational selection of compressor running number, to match its cooling capacity with the thermal load of the system.
3, according to the technical requirements and the outside temperature changes, adjusting the functioning of the fan and water pump number.
4, regular fuel, vent, defrost and remove scale, maintain a good heat transfer equipment to avoid excessive condensation pressure and evaporation pressure is too low.
As much as possible to improve working conditions for refrigeration equipment
1, improving water quality, slowing the scaling, improved condenser condensation effect, reducing the condensing temperature.
2, refrigeration equipment, motor load 0.4 per cent when the motor can be changed to y-grafting to improve the power factor, and requirements and y connections canbe switched automatically.
3. using automatic control operation instead of manually operated as far as possible, can operate in optimal conditions of the refrigeration system, so you can save 10-15.