With the shoulders of social science and technology, in the aspect of refrigeration, air conditioners and air conditioners have appeared. The cooling effect of these machines is also very strong, comparable to air conditioners. The condensing and evaporating temperatures are also constantly changing, and the cooling capacity of the cooler is also constantly changing. The cooling coefficient is the ratio of the cooling capacity to the power consumption, and is the main economic indicator for measuring the economic rationality of the operation of the air cooler.

Cooler cooling system

    Reasonably adjust the operating parameters of the cooler. The evaporation temperature should generally be 8 ° C to 10 ° C lower than the temperature of the warehouse, and the condensation temperature should generally be 3 ° C to 5 ° C higher than the temperature of the cooling medium. Calculate the cooling capacity of the compressor based on the heat load, evaporation temperature and condensation temperature, and determine the number of compressors to be put into operation. In actual operation, it is generally determined according to the absolute pressure ratio whether to adopt single-stage compression or double-stage compression. Absolute pressure ratio ≥8, using two-stage compression; absolute pressure ratio <8, using single-stage compression.

    Reasonably adjust the intermediate pressure and intermediate temperature. The intermediate pressure and intermediate temperature are related to the condensation temperature, the evaporation temperature, and the volume ratio of the high and low pressure machines. It is worth noting that, in actual operation, the normal liquid level of the intercooler must be maintained. This is not only conducive to reducing the exhaust temperature of the high-pressure machine and preventing the formation of carbon deposits, but also to reduce the temperature of the refrigerant liquid in front of the throttle valve, increase the unit cooling capacity and increase the refrigeration coefficient.

    In the ammonia refrigeration system, the liquid recooling temperature before the throttle valve is generally 5 ° C to 7 ° C higher than the intermediate temperature. The suction temperature of low-pressure machines and single-stage compressors should be 5 ° C to 15 ° C higher than the evaporation temperature.

    The condensing pressure should be compatible with the condensing temperature. If the condensing pressure is too high, check whether the relevant valves of the high-pressure system are open, discharge air and oil, increase the amount of cooling water and cooling air, reduce the cooling water temperature, reduce the heat load, and reasonably configure the condenser.

    The evaporation pressure should be compatible with the evaporation temperature. For air-conditioning systems and medium-temperature and medium-pressure refrigeration systems, the evaporation pressure is generally higher than atmospheric pressure, which helps prevent air from entering the refrigeration system. For places where low temperature is required, a multi-stage compression refrigerator, a cryogenic refrigerator, or a low-temperature refrigeration device can be selected according to the actual situation.

    Pumps and fans used in refrigeration, air conditioning and HVAC projects should be controlled by frequency conversion and PLC new technologies. This is conducive to achieving automatic control of the system, saving energy and reducing operating costs. This advanced control technology is used more in small household air conditioners and commercial air conditioners, and it is slower to promote in large refrigeration and air conditioning projects and heating projects due to the larger equipment investment.

With the rapid development of industrial and agricultural production and the increase in the degree of mechanization and automation, the demand and types of motors are also increasing.

There are many types of coolers. It is necessary to properly classify the motors.

There are many classification methods of motors. For example, according to different purposes and conditions of use, motors can be divided into general-purpose motors, marine motors, explosion-proof motors, petrochemical motors, tropical motors and other special motors.

According to the protection type of the motor shell, it can be divided into: open type, protective type, closed type and so on.

Motivation is also called (commonly known as motor), which is represented by the letter "M" (old standard used "D") in the circuit.

Its main role is to generate driving torque, as a power source for electrical appliances or various machinery.

The generator is indicated by the letter “G” in the circuit.

Its main function is to convert mechanical energy into electrical energy. At present, the most commonly used is to use thermal energy, water energy, etc. to propel the generator rotor to generate electricity. With the maturity of wind power technology, wind power has slowly come into our lives.

Transformers are called stationary motors in some books.

I found from the definition of the motor, so to speak also makes sense.

    Negative pressure fan is a cooling principle using air convection and negative pressure ventilation. It is a kind of opposite from the installation site-the door or window naturally inhales fresh air, and the sweltering indoor air is quickly forced out of the room. Any problem of poor ventilation can be Improved machine, cooling and ventilation effect can reach 90% -97%. The function of this fan is very powerful. Ningbo air cooler, Ningbo air cooler

    1. Agriculture: Negative pressure fans were used for greenhouse planting earlier. Negative pressure fans are used for orchids or anti-seasonal plants.

    2. Animal Husbandry: Extending from greenhouse seeds is the use of animal husbandry. It is well known that the environment of chickens, ducks, and pigs directly affects the yield and survival rate. In other words, the quality of the environment is related to the profit of livestock.

    3. Industry: garment factories, shoe materials factories, toy hardware factories, etc. Negative pressure fans can be found everywhere in various industrial fields.

    4. Public places: It is common to install negative pressure fans in Internet cafes and canteens, which have low cost and high efficiency, and can also improve the harsh environment of dense population. There are also some shopping malls, auditoriums, stadiums, stations, hospitals, etc. use.

    The use of negative pressure fan is very good, with high efficiency. The shutters can be opened and closed automatically to be dustproof, waterproof and beautiful. It can be used for air blowing and air extraction, which is a good choice for cooling and ventilation in modern workshops. Environmental protection and energy-saving negative pressure fans will become the mainstream of ventilation and cooling equipment market.

     There are many types of fans, and the effects of different types of functions are naturally different, so you must grasp as appropriate in your choice. There are many fans installed in many workshops, but the workshop is still very sultry. This is definitely the fan that is not suitable. The following is the analysis of the difference between axial fans and negative pressure fans.

     The exhaust of the axial fan is on an axis. The example shows that if you stand beside the axis of the axial fan, you will not feel the airflow at all, although there is a lot of wind on the axis. Its air flow is linear, and it can rarely be driven by the surrounding air. It is like a high-pressure faucet spraying water. Standing on the side of the water flow, your body will not be wet.

     A negative pressure fan is like a reverse sprayer. Its absorption of air is horn-shaped. It not only drives the airflow from the axis of the fan, but also flares the air from the fan outward. We stand next to the axis of the fan. You will feel strong airflow. Its characteristics determine the thoroughness and high efficiency of its exhaust.