commercial refrigeration The structural impact of refrigerated food (3)

2. Promptly carry out technological transformation and eliminate energy-intensive equipment. Science and technology continue to develop, with low energy consumption and benefits. High equipment will continue to appear. It is necessary to carry out technological transformation in time and replace old equipment and old technology with new technology and new equipment. According to actual measurement, the refrigeration capacity per unit shaft power of various old models of refrigeration compressors is generally lower than that of the new series of commercial refrigeration refrigeration compressors, and the energy consumption index is higher.

3. Reasonable operation to reduce the energy consumption of the refrigeration system. Typical medium-scale refrigeration commercial refrigeration The energy consumption of each part of the refrigeration system is distributed as follows: the power consumption of the compressor is 78%, the energy consumption of the fan in the commercial refrigeration is 15%, and the cooling water pump can The energy consumption is 4%, the energy consumption of the refrigerant pump is 1%, and the other energy consumption is 2%. It can be seen from the distribution of energy consumption that the energy saving of the refrigeration system should mainly start with the compressor and the air cooler. The main measures are as follows.

1) Avoid turning on the refrigeration compressor during the hottest time of the day. When the temperature outside the commercial refrigeration is high, it will increase the condensing temperature, increase the compressor discharge pressure, increase the power consumption of the compressor, and waste energy.

2) Reduce the heat exchange temperature difference of the heat exchanger. Reduce the temperature difference of the heat exchanger to reduce the condensation temperature, increase the evaporation temperature, improve the efficiency of the refrigeration system, and achieve energy-saving effects, but this requires increasing the area of ​​the heat exchanger.

3) Setting appropriate control accuracy Control accuracy can affect the operating time of the refrigeration unit, but the control accuracy should be set according to the requirements of the stored goods and different storage periods. From the perspective of energy saving, as long as it does not affect the quality of the product, the control accuracy should be low rather than high, and there is no need to one-sided pursuit of high-precision control. In addition to the original commercial refrigeration room temperature setting, for the commercial refrigeration room temperature control of multiple cold storage rooms, it is advisable to add a commercial refrigeration temperature over-limit control value. This two-factor commercial refrigeration room temperature adjustment enables the refrigeration system to be put into operation as required, and will not be put into operation prematurely due to the deviation of the temperature of individual commercial refrigeration rooms: it is also possible to prevent the refrigeration room or the refrigeration system from being overrun according to the actual situation at the time. Stop operation early, make full use of existing energy and avoid frequent start and stop of equipment or systems.