The telecommunications room is the hub of telecommunications operations, and it is extremely important as a computer room air conditioner to ensure the operating environment of the telecommunications room equipment.
The telecommunications room is the hub of telecommunications operations, and it is extremely important as a computer room air conditioner to ensure the operating environment of the telecommunications room equipment. The air conditioners of the telecommunication equipment room are all selected according to the maximum heat load of the equipment room with a margin. Due to changes in seasons and day and night, the actual air conditioning heat load is much lower than the design load for most of the time. Since the original temperature adjustment method of the computer room air conditioner is an energy consumption adjustment method, there is a large amount of energy waste. The computer room air conditioner has a long startup time. As long as the computer room equipment is running, the computer room air conditioner must be turned on. The total energy saving throughout the year is considerable.
Under the general environment of national energy-saving policies and the intensified competition in the telecommunications industry, the call for control of operating costs is getting higher and higher. It is imperative to carry out energy-saving transformation of computer room air conditioners to save operating costs. Frequency conversion energy saving is currently the most important It is an energy-saving technology suitable for air conditioning. Therefore, it is of great significance to promote the economic operation of telecommunications equipment rooms to promote the energy-saving conversion of air conditioners in computer rooms.
Requirements for the air-conditioning renovation system of telecommunications room
1. Input voltage: 380V (-15%~+15%);
2. Ambient temperature: 0℃~35℃;
3. Ambient humidity: 35%~70%; LWL
4. Dustproof requirements: no special dustproof requirements;
5. Lightning protection requirements: no lightning protection requirements (unified consideration by telecommunication buildings);
6. Electromagnetic environment: It is well compatible with the telecommunications room operating environment (including electromagnetic environment). Require to pass relevant tests of the post and telecommunications department;
7. High reliability, low failure rate, can be switched to the standby system at any time during failure;
8. Good energy saving effect and good economy.
Features of Alpha Telecom Air Conditioner Specialized Inverter
Alpha is a company specializing in R&D and manufacturing of inverter products. The products have been widely used in various industries. The company meets the needs of customers with high-quality products and perfect services. Alpha Telecom's special air conditioner for computer room air conditioner is a special product developed by the company on the basis of the original general product for two years. It has its own intellectual property rights. It has been proved by Shantou Telecommunication Bureau and Hubei Jingzhou Telecommunication Bureau that the effect is good, and it has been approved by the expert group of Guangdong Provincial Telecommunications Administration and has been promoted to the whole country.
1. Product features
a Use 32bit high speed and high precision motor control dedicated CPU
b Independent intellectual property rights, built-in multiple proprietary technologies
c Perfect fault protection and management functions
d Online monitoring and online parameter modification, easy to debug and use
e Built-in PI regulator can be used for temperature control.
f Passed EMC test, the operation is more stable and reliable
g Built-in power/frequency conversion circuit
h Strict quality management system creates first-class quality
i The common-mode inductance formed by the built-in magnetic ring on the main circuit has a good suppression effect on common-mode interference, and can well suppress the external radio frequency interference of the inverter.
j The frequency converter is designed for the special requirements of the telecommunications industry. The use of input AC reactors and output frequency conversion filters makes the frequency converter's harmonic pollution of the power grid and the output harmonic content greatly reduced.
2. The internal structure block diagram of the inverter is as follows
节能原理
1、电信机房空调的配置往往大于实际所需制冷量（考虑机房的扩容需要及可靠性要求，在设计时有较大的设计余量），而由于环境温度、机房设备的投入量等因数的变化必然使所需的制冷量在较大的范围内变化。图1示出一般空调热负载率变化的情况：
Figure 1 Thermal load change rate curve
a The system uses ALPHA telecommunications room air conditioner special inverter as the core control unit, and the internal precise software algorithm ensures reliable and excellent performance.
b The start and stop signals of the inverter are given by the PLC of the control system, and the output of the inverter directly controls the air-conditioning compressor.
c The frequency converter uses the output signal of the temperature sensor installed at the air inlet of the air conditioning system as temperature feedback; monitors the indoor temperature changes in real time to adjust the operating frequency to achieve the purpose of constant temperature and energy saving.
System structure description:
In view of the current use of frequency converters for telecommunications air conditioners, mainly in transformation projects, the system is constructed according to the following principles: on the basis of ensuring system performance, the original system equipment is retained as much as possible. l
The system has power frequency, frequency conversion switching function. Ensure that when the inverter fails, the system can easily switch to the power frequency power supply state. l
2. Control principle
a When the temperature of the return air inlet is higher than the set temperature, after the PI calculation built into the inverter, the output frequency of the inverter is controlled to increase, thereby controlling the operation speed of the air-conditioning compressor to increase, increasing the cooling capacity of the compressor per unit time, the temperature in the machine room reduce;
b When the temperature of the return air inlet is lower than the set temperature, after the PI calculation built in the inverter, the output frequency of the inverter is controlled to be reduced, thereby controlling the operation speed of the air conditioner compressor in the computer room to slow down, reducing the cooling capacity of the compressor per unit time, and making the computer room The internal temperature rises;
c Use this automatic adjustment method to keep the temperature in the equipment room at the set value. The system parameters can be adjusted in actual operation, so that the system control response tends to be complete. For example, different temperature values can be given in different seasons, which not only saves energy but also better the requirements of the computer room for the working environment temperature.
d ALPHA Telecom room air conditioner special inverter has built-in PI adjustment. The temperature sensor instantly detects the temperature of the return air inlet and converts it into a 4-20mA current signal, which is directly sent to the inverter analog current input port to set the given temperature value and PI parameter value.
e When the air conditioning constant temperature control system is running, it often encounters that when the ambient temperature is low, the temperature in the machine room is lower than the set temperature. When the temperature sensor detects that the temperature of the air outlet has been lower than the set temperature for a long time, this special frequency converter The inverter has a sleep function that can suspend the operation of the air conditioner compressor. When the output frequency of the inverter is lower than its lower limit, but the actual return air temperature is still lower than the set temperature, the inverter will enter the sleep state and stop working after a certain period of time; When the temperature of the return air inlet is higher than the set value, the inverter is woken up and enters the PI adjustment state again. "Sleep confirmation time" is built in the inverter. When the output frequency of the inverter is lower than the sleep value, the time is less than the sleep confirmation time td When, that is tdt, the inverter enters the sleep state.
User benefits
1. Extend equipment life and reduce system maintenance. After the frequency conversion energy-saving transformation, the air conditioner compressor uses soft start and greatly reduces the number of compressor starts and stops, extending the life of the compressor.
2. The air conditioning cooling capacity can be dynamically and smoothly adjusted after frequency conversion energy-saving transformation, the system responds quickly, the temperature control accuracy is high, and the stability is good.
3. The energy saving effect is remarkable, and the economic benefit is considerable.
After the frequency conversion energy-saving transformation, the energy-saving effect is remarkable. According to different seasons and heat load, the power saving rate is between 15% and 40%.
Shantou Telecommunications Bureau computer room air conditioning inverter energy-saving transformation operation test report
systems mannual:
Shantou Telecommunications Branch began to use frequency conversion energy-saving trial transformation with ALPHA telecommunications room air conditioner special inverter in June 2004. The frequency conversion equipment was put into use in July, and there have been no abnormalities in the air conditioning system and frequency conversion equipment. The air conditioning of the equipment room is as follows:
A total of three constant-temperature and constant-humidity air-conditioning units are equipped, two for one and one for standby. They are produced by Guangdong Jirong Air-conditioning Equipment Company, and each unit has two compressors. Among them, the compressor power of two units is 7.5KW, and the compressor power of one unit is 11KW. During the transformation, each air-conditioning unit is equipped with an ALPHA telecommunications room air-conditioning special inverter.
According to the annual average temperature distribution in Guangdong Province, the test period was selected at the time when the annual average temperature was the highest, about 30°C on average, and the operating efficiency of the air-conditioning unit was above 93%, that is, the time when the energy saving effect was the worst The running test data is as follows:
Actual test results: From the above data, it can be seen that the power saving rate of the air conditioner frequency conversion of the special air conditioner in the machine room also reaches an average of about 23% when the heat load rate is the highest.