Shulou(Shulou.com)05/31 Report--

Today, I will talk to you about the solution to the frequent refrigeration failure of the server in the computer room, which may not be well understood by many people. in order to make you understand better, the editor has summarized the following contents for you. I hope you can get something according to this article.

The computer room is a data processing center, there are a large number of switches, routers, magnetic media and other electronic equipment, these equipment work will produce a lot of heat, but these equipment have certain requirements for environmental temperature, humidity, cleanliness, each value is kept within the prescribed range, in order to ensure that the computer room runs in a good environment, once there are problems in the refrigeration system of the computer room, there will be many problems. According to the induction of the common faults of the refrigeration system in the computer room, the timely solutions are given.

I. the causes of the failure of the refrigeration system in the computer room

(1) treatment of power outage in computer room

When there is a power outage in the computer room, the main task is to prevent the misoperation of the compressor and ammonia pump when calling again, resulting in excessive pressure. The treatment principle is to put the ammonia pump of the compressor in the shutdown state and restart the operation when the power supply is restored.

(2) the cause and harm of water stoppage

The main reasons for the water shutdown of the air conditioning refrigeration system in the computer room are the failure of the cooling water pump, the blockage of the water cooling tower or the cooling water system.

As the condenser and compressor cylinder head of the air conditioning refrigeration system in the computer room need to be cooled by cooling water, the compressor temperature and condensation pressure will rise sharply when the water is cut off. If it is not dealt with in time, the compressor will be damaged if it is light, and the pressure vessel will be damaged and refrigerant leakage will be caused if it is heavy.

(3) the cause and harm of overpressure

The overpressure is usually shown as the compressor gas pressure or condensing pressure is too high, the main reason is water cut, compressor exhaust valve or check valve failure.

The protective device to prevent overvoltage is the high-voltage controller. In order to prevent accidents caused by overpressure, the high-voltage controller does not allow private adjustment.

Overpressure will increase the exhaust temperature of the compressor and carbonize the lubricating oil, which may damage the compressor, damage the pressure vessel and leak the refrigerant.

(4) cause and judgment of leakage of safety valve.

The failure of the safety valve to close normally is called leakage, which mainly occurs in the compressor for the following three main reasons:

① has not been checked for a long time.

After ② take-off, the sealing surface enters the foreign body.

The quality of ③ safety valve is not good.

When the compressor safety valve leakage occurs, the exhaust pressure is lower than the normal value, the suction pressure is higher than the normal value, and the exhaust temperature is higher than the normal value.

When the pressure vessel safety valve leaks, there is condensation or frosting at the valve body and outlet.

(5) the cause of wet stroke of compressor

The reason for the wet stroke of the compressor is that the liquid level of the intercooler, low-pressure circulation reservoir, ammonia separator and other containers is too high, and the compressor inhales ammonia. A wet stroke can be considered to have occurred under one of the following circumstances:

The ① compressor emits a "when, when" sound, which is a serious wet stroke.

The exhaust temperature of ② drops sharply, which is not serious wet stroke.

③ body condensation or frost, but there is no "when, when" sound, this is not a serious wet stroke.

(6) the cause of shaft seal leakage

The main reasons for shaft seal leakage are as follows:

Aging of rubber ring for ① shaft seal

Improper assembly of ② shaft seal fixing ring and movable ring or shaft seal quality defect

③ shaft seal is short of oil.

(7) the reason why the crankcase temperature of compressor is too high

If the crankcase temperature of the compressor exceeds 70 ℃, the crankcase temperature is too high, and the main reasons for the high temperature of the crankcase of the compressor are:

① lubricating oil is too dirty or deteriorated

High and low pressure Gas channeling of ② Compressor

The water cut off or the cooling effect of ③ oil cooler is poor.

Compressor crankcase temperature is too high will cause compressor exhaust temperature is too high, bearing burnout and other failures.

The reason why the computer room is not cold enough is that there is something wrong with the system.

From the point of view of operation and maintenance, the specific factors that affect the refrigeration effect of air conditioning are evaporation temperature, opening degree of expansion valve, condensation pressure and so on.

(1) evaporation temperature of the refrigeration system:

The evaporation temperature of the refrigeration in the evaporator should be lower than the air temperature, so that the heat from the computer room will be transferred to the refrigerant, and this temperature difference is determined by the combination of the investment cost of air conditioning and the energy consumption cost of refrigeration. In the air conditioning of the computer room, the temperature difference is generally 12C °to 14C °. If the temperature difference can not be well guaranteed due to a variety of adverse factors, the energy consumption will increase. Through calculation, the evaporation temperature of the refrigerant in the evaporator in the refrigeration system is reduced by 1C °, and the power consumption is increased by about 4% in order to produce the same cooling capacity.

(2) the opening degree of the expansion valve is incorrect:

Too large or too small opening of the expansion valve will lead to too large or too small refrigerant flow, make the working state of the expansion valve deviate from the working condition, reduce the refrigeration efficiency, and even lead to equipment damage and unnecessary waste. Therefore, it is necessary to measure the superheat of the expansion valve regularly and adjust the opening degree of the expansion valve according to the superheat. The superheat is the difference between the two readings of the evaporator outlet temperature T1 and the evaporator outlet pressure T2. The superheat of the expansion valve should be within a certain range, and if it exceeds the normal range, it needs to be adjusted.

(3) the condensation pressure of the refrigeration system:

When the heat transfer of the condenser is poor, the condensation pressure will increase and the cooling efficiency will decrease. In order to achieve the same cooling capacity, power consumption will rise. Every time the condensation pressure increases 9.8Pa (1Kgf/ square centimeter), the power consumption increases by 6% Mel 8%. Sundries and dust stick to the fins of the condenser, resulting in the lack of large flow of air through the condenser, the increase of thermal resistance, the decrease of condensation effect and the increase of condensation pressure. If the cooling system is equipped with a small condenser, the heat transfer capacity is not enough, which will lead to too high condensation pressure.

After reading the above, do you have any further understanding of the solution to the frequent refrigeration failure of the server in the computer room? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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