How to make the cold storage more energy-efficient by means of automatic control (2)

How to make the cold storage more energy-efficient by means of automatic control (2)

Air cooler (cooler) defrost control

The cooling fan is basically semi-automatic or timed defrost control. The problem is that the defrost command may not be timely or delayed, and the defrost process brings too much heat. In order to save energy, the defrosting of the chiller should be fully automatic. First, there must be a suitable and reliable frost layer sensor or differential pressure transmitter (in some cases, a current transmitter can also be used) to sense the good defrost time of the Zui; then there must be a reasonable defrost procedure; Cooling fan fin thermometer to prevent excessive heating. The three-pronged approach will definitely enable the cooling of the air-cooler. In some assembled refrigerated warehouses, a wide range of electric heating defrosting chillers are used, and a computerized control system is used to change the fixed timed heating defrosting into on-demand defrosting, that is, memory memory is remembered for each actual defrosting situation. And analysis to determine the good defrost cycle of Zui. On-demand defrost is about 10% more energy efficient than regular defrost.

How does the cold storage door control make the cold storage more energy efficient by means of automatic control (2)

The cold storage door has to be opened and closed, which is a regulation of every cold storage management, but no cold storage can be completely done, in addition to individual barbaric operations, there are also actual objective reasons. The solution to the solution is also automatic control. If the door opening time is too long, it will be automatically closed. The heat load of the door opening loss is very large, and the energy saving effect is considerable.

The electric heating wire power of the cold storage door has two options: anti-condensation and anti-freeze. The configuration power of the cold storage door electric heating wire with different temperature is also different. Note that the optional heating power can save 2% energy.

Warehouse lighting control

The lighting of the warehouse is 1.8~5.8W/m2 according to the design of the cold storage refrigeration design manual, but in actual engineering, it is often more than 10W/m2. If you forget to turn off the lights, not only the lighting energy is wasted, but also the heat load of the cold room and the cooling system. Adding a simple control avoids waste. When the cold storage door is closed for 5 to 15 minutes, if the illumination is still on, the illumination is automatically turned off. The time delay should exceed the time of the worker's work for a long time to avoid turning off the lights incorrectly; in case of accidental turning off the lights, the safety of the personnel is guaranteed by the safe setting of the warehouse light and the cold storage door.

Condenser and condensing temperature adjustment

1. Sensing element and adjustment object of condensation temperature

Depending on the correspondence between the condensing temperature and the condensing pressure, the condensing pressure is usually used as a parameter for adjusting the condensing temperature. In the past, a high-pressure pressure controller was used as a sensor and a control signal was issued, and the adjustment effect was general. Pressure transmitters are now commonly used as sensors and computer control systems, simplifying the transmission, improving adjustment accuracy and increasing reliability. The object of adjustment is the operating state of the condenser and the input of the equipment. Taking the evaporative condenser as an example, the adjustable condenser operating conditions include dry running, wet running, and variable frequency operation of the fan and the water pump; the input of the condenser will also vary according to the load. For every 1K drop in condensing temperature, the energy saving effect is as valuable as the energy saving effect of each 1K increase in evaporation temperature.

2, variable condensing temperature adjustment

Using the functions of the self-control components and the computer control system, the floating control of the condensing pressure can be implemented to avoid the condensing pressure being high or low, and the energy-saving operation effect can be achieved on the basis of ensuring the normal operation of the refrigeration system. Taking a quasi-centralized refrigeration system as an example, its unit and air-cooled condenser are controlled by a dedicated variable programr, which can save 10% energy.

Refrigeration compressor energy-saving operation (mainly energy regulation)

The energy regulation makes the refrigeration capacity of the compressor change with the change of the heat load, which is one of the important contents of the automatic control of the cold storage energy saving. Different refrigeration compressors or units have different emphasis on energy-saving operation and energy regulation.

1. Screw refrigeration compressor

When setting the cooling capacity of the compressor, avoid the operating range of its low energy efficiency ratio; carry out the automatic adjustment of the internal volume ratio for the refrigeration system with a wide range of operating conditions; for the screw machine with economizer operation, discuss the implementation of the economizer Automatic adjustment of operating conditions.

2, piston compressor

Reduce the number of cylinders working with a compressor as the energy adjustment unit, avoid the reactive operation of the piston, and avoid reducing the operation of the compressor C0P value; use the frequency conversion technology to achieve energy stepless adjustment, in the improvement of operating conditions Energy saving.

3, multiple sets and online operation adjustment

Try to use the number of compressors as the energy adjustment unit; try to make each compressor in a high energy efficiency operation state; design a combination of compressor heads of different sizes, and put in the corresponding energy combination for the load change needs.

Frequency conversion

Frequency conversion technology for compressor energy regulation is one of the more popular methods. If the frequency conversion is too low, it will cause the oil pressure difference to decrease and the oil quantity to decrease. If the frequency conversion is too high, the oil circulation amount and consumption will increase, and the compressor valve failure will increase. Variable frequency drive should also pay attention to its motor should be selected according to the high power of Zui. How to make the cold storage more energy-efficient by means of automatic control (2)

Real-time calculation control to ensure system zui energy-saving operation

The optimized design of the refrigeration system and the automatic control of the zui good operation are very important to achieve cold storage energy saving. The real-time control task of the energy-saving operation of the cold storage can be completed by the data collection, calculation control and monitoring system. The data acquisition and calculation control system collects all relevant parameters of the refrigeration unit, refrigeration system and working environment. The categories include temperature, pressure, differential pressure, liquid level, current, operating status and fault conditions. If you want to know the cold storage price you need, Shanghai Xueyi Refrigeration is a refrigeration engineering company engaged in cold storage installation, cold storage design, cold storage after-sales maintenance and repair. The cold storage construction team has many years of on-site construction experience. If you need to design and install cold storage and cold storage in the near future. Price, welcome you:

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