The amount of cooling capacity of the refrigeration equipment is directly related to the operating conditions of the system. For the compressor with the same structure, speed and refrigerant type, the operation and management are different due to the change of operating conditions, and the cooling capacity and energy consumption. Also with the change.
1. As the evaporation temperature decreases, the compression ratio of the compressor increases, and the energy consumption per unit of production increases. When the evaporation temperature is lowered by 1 ° C, it consumes 3% to 4% more. Therefore, the evaporation temperature difference is reduced as much as possible, and the evaporation temperature is increased, which not only saves power consumption, but also improves the relative humidity of the cold room.
2. As the condensing temperature increases, the compression ratio of the compressor increases, and the energy consumption per unit of cooling capacity increases. The condensing temperature is between 25 ° C and 40 ° C. For every 1 ° C increase, the power consumption is increased by about 3.2%.
3. When the heat exchange surface of the condenser and the evaporator is covered with an oil layer, the condensation temperature will rise and the evaporation temperature will decrease, resulting in a decrease in the amount of cooling and an increase in power consumption. When a 0.1mm thick oil layer is accumulated on the inner surface of the condenser, the compressor cooling capacity will be reduced by 16.6, and the power consumption will increase by 12.4. When the oil is 0.1mm thick on the inner surface of the evaporator, in order to maintain the predetermined low temperature requirement, The evaporation temperature drops by 2.5 ° C and the power consumption increases by 9.7.
4. When the air collects in the condenser, it will cause the condensing pressure to rise. When the partial pressure of the non-condensing gas reaches 1.96105Pa, the power consumption of the compressor should be increased by 18.
5. When the scale of the condenser wall reaches 1.5mm, the condensation temperature rises by 2.8 °C than the temperature before scaling, and the power consumption increases by 9.7.
6. The surface of the evaporator is covered with a layer of frost, which reduces the heat transfer coefficient. Especially when the outer surface of the finned tube is frosted, it not only increases the heat transfer resistance, but also makes the air flow between the fins difficult, reducing the appearance. Heat transfer coefficient and heat dissipation area. When the indoor temperature is lower than 0 °C, when the temperature difference between the two sides of the evaporator tube group is 10 °C, the heat transfer coefficient of the evaporator after working for one month is about 70 before frosting.
7. The gas inhaled by the compressor allows a certain degree of superheat, but the superheat is too large, the specific volume of the inhaled gas increases, the cooling capacity decreases, and the relative power consumption increases.
8. Compressor comes to frost, quickly close the small inhalation valve, drastically reduce the amount of cooling, and relatively increase the power consumption.
Through the above analysis, it is known that doing a good job in the operation and management of refrigeration equipment is an important part of improving the economic efficiency of the refrigeration system.
OEM is "original equipment manufacturer" which means the battery is identical to what was originally supplied with the phone. Non-OEM is a battery made by a different company that reverse-engineered the original battery and started producing functionally-equivalent copies for sale into the same application.
There is no hard and fast rule, but generally people perceive OEM to be higher quality and more reliable than non-OEM, as a result pricing will often be higher for OEM batteries. Batteries are difficult to manufacture consistently because minor variations in water content (parts per million) and minor mis-matching of the anode and cathode capacities (produced by micron thickness variations in coating processes) cause substantial cycle life reduction in the final battery. It could be the difference between getting 100 cycles out of a battery (not to hard) versus 500 (more challenging). OEM's might have a higher reject rate of marginal batteries, which leads to higher costs on the ones that do pass.
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