Constant temperature and humidity air conditioning refers to the special air conditioning machine with strict requirements for temperature, humidity and cleanliness, which has the functions of high efficiency and energy saving, low noise and environmental protection, and can be widely used in the industries of electronics, optical equipments, cosmetics, medical and health care, biopharmaceuticals, food manufacturing, all kinds of measurement, testing and laboratories, and so on.
Characteristics of constant temperature and humidity air conditioning
1, year-round refrigeration
As the heat generation of the server room is very large, some IDC server room heat generation is more than 30kw / m2, so the whole year is cooling.
One point to be mentioned here is that the machine room air conditioning also has a heater, only in the dehumidification of the start. Should be for dehumidification when the air temperature should be relatively low, to avoid the room temperature is reduced too quickly (machine room requires temperature change every 10 minutes does not exceed 1 ℃, humidity does not exceed 5% per hour).
2, high-precision design
The computer room air conditioning not only on the temperature can be adjusted, but also on the humidity can be adjusted, and the precision is very high. Computers, especially servers, have particularly high requirements for temperature and humidity, if the change is too large, the computer's calculations may be wrong, the service provider is very unfavorable, especially in the banking and communications industry.
Now the machine room air conditioning requirements are generally in the temperature accuracy of ± 2 ℃, humidity accuracy of ± 5%, high-precision machine room air conditioning can be temperature accuracy of ± 0.5 ℃, humidity accuracy of ± 2%.Constant temperature and humidity air conditioning compressor failure analysis and elimination
1, constant temperature and humidity air conditioning suction temperature is too high
Reason: insufficient refrigerant or leakage; evaporator refrigerant is insufficient; the expansion valve is open too small.
Remedy: leak detection (connection and weld oil stains) and eliminate leaks; supplement refrigerant; adjust the amount of liquid supply; increase the valve opening so that the suction temperature is higher than the evaporation temperature of 10 ~ 15 ℃.
2, constant temperature and humidity air conditioning suction pressure is too high
Reasons: refrigerant overload; heat load is too large; expansion valve opening is not appropriate; temperature sensing package installation is not secure; compressor displacement is reduced; oil separator back to the oil failure.
Remedy: discharge excess refrigerant; adjust the load; adjust the valve opening; temperature-sensitive package re-taping; check the exhaust valve piece, and its repair or replacement; check and repair the automatic oil return or temporary manual oil return.
3, constant temperature and humidity air conditioning suction pressure is too low
Causes: refrigerant shortage; ice plug; evaporator frost is too thick; dirty plug or too much oil; expansion valve opening is too small; sensing the leakage of the packet; the valve on the oil supply pipe, the liquid valve opening is small; solenoid valve failure; screening program blockage.
Remedy: Charge the refrigerant to meet the requirements; change the dry screening program, remove the water in the system; should be regularly defrosted;淸洗去污或把油放出去; adjust the opening of the expansion valve; replacement of the thermal expansion valve; open the valve, the outlet valve larger; overhaul or replacement of the solenoid valve; remove and clean the screening program.
Constant temperature and humidity air conditioning maintenance
1, water-cooled condenser maintenance
(1) timely exclusion of the condenser packages non-condensable gases and lubricants.
(2) According to the operation of the precision air conditioning cooling water system, regular cleaning of the cooling tower water catchment tray and piping system set up in the decontaminator, water screening program.
(3) Strengthen the precision air conditioning cooling water quality testing, found that the water quality deterioration, the cooling water used in the system to partially or completely replaced.
(4) pay attention to the precision air conditioning condenser heat transfer tube scaling, if the scaling is serious, it should be timely descaling. In order to slow down the scaling, you can add an appropriate amount of scale inhibitor in the cooling water. Can also be used by the water treatment of cooling water.
2, air-cooled condenser maintenance
For precision air conditioning air-cooled condenser normal maintenance is mainly based on the accumulation of ash on the heat transfer fins,
regular blowing or cleaning to keep the heat transfer surface clean.3, cooling air with evaporator maintenance
(1) regularly blowing or rinsing evaporator heat transfer fins on the ash.
(2) cold storage evaporator, according to the thickness of the frost layer on the surface of the tube defrost in time.
4, other auxiliary equipment maintenance
(1) dry screening program: to pay attention to the liquid flow indicator on the refrigerant water content of the instructions, when it is light red indicator, dry bath screening program in the drying agent failure, should be immediately replaced with a desiccant.
(2) intercooler, gas-liquid separator: regular inspection of the float valve as well as in the unit overhaul blowing and pressure test, the separator has a heating device should also be set to check the heating device.
Constant temperature and humidity air-conditioning refrigeration compressor deployment and conversion
Constant temperature and humidity air-conditioning refrigeration compressor deployment is based on the changes in the system load,
to adjust the system mode of operation and the number of workstations, so that the system works in a reasonable working condition. The principle of compressor deployment should be under the premise of ensuring that the process, as far as possible, energy saving, and at the same time should facilitate safe operation and management. Constant temperature and humidity air conditioning compressor deployment principles:1, the compressor refrigeration capacity should match the cold load.
2, when the system pressure ratio is less than 8 or the pressure difference between the two is less than 1.4MPa when the application of single-stage refrigeration, otherwise double-stage refrigeration should be used.
3, when the system load is large, the evaporating temperature should be similar to the evaporating temperature together with the machine.
4, the number of operating units should be as small as possible, energy saving and easy to manage.
The above is about the characteristics of constant temperature and humidity air conditioning is introduced, I believe that we all have an understanding of this, you can choose and buy according to their own actual situation, I hope it will be helpful to you.