What is the principle of central air conditioning? Different components
Speaking of central air-conditioning, everyone must be familiar with it. Nowadays, office buildings or family houses with larger areas generally use central air conditioners to adjust the temperature. Whether it is home or commercial, their working principle is the same, but there may be some differences in size and power. So how much do you know about the central air conditioning principle ? Come and learn from the home of the decoration home network. Let's have a look.
First, the central air conditioning working principle - cold / hot water type unit
1. The outdoor unit cools (cools or heats) the cold (hot) medium water, and then the cooled (hot) water after cooling is sent by the water pump to the fan coil unit installed indoors, taken by the fan coil unit The method of returning to the local air exchanges with indoor air to achieve the purpose of indoor air treatment.
2. The central air conditioner of the fixed frequency cold water machine or the frequency conversion hot and cold water machine is the reduction of the large central air conditioner. The condenser is changed from water cooling to air cooling, and the hot water is sent to the fan coil by the water pump. The introduction of fresh air, manhole, ceiling condensate discharge, noise index and multi-connection are the same, but the hot and cold water pipes are added; due to the large temperature difference, the sealing problem is prominent, and the water leakage has a great damage to the decoration. In addition, large central air-conditioning evaporators are regularly cleaned and pickled. There is no good policy for domestic hot and cold water machines. The efficiency of long-term use of cold heat exchangers will be greatly reduced. If combined with a central water treatment system, the above difficulties can be overcome.
3. Air conditioners are used in separate rooms. In other rooms, the fan coils have hot and cold water pipes flowing through them, which will also generate energy consumption. It is more popular to use electromagnetic water valves to close the waterways. In addition to the cost factors, the local water flow rate will also be exceeded. High, causing noise problems.
Second, the central air conditioning working principle - fixed, frequency conversion
1. During heating, the outdoor unit absorbs the refrigerant vapor from the condenser and compresses it to deliver vapor refrigerant to each indoor unit. Each indoor unit is placed on the ceiling by means of installation. The air is sucked through the air return port, heat exchange is performed, and the air is sent back to the room by the local air return air from the air supply port.
2. During cooling, the outdoor unit absorbs the refrigerant vapor from the indoor unit and compresses and condenses it to deliver liquid refrigerant to each indoor unit. The unit is controlled by a microcomputer in the energy regulation mode, and the variable frequency compressor of the outdoor unit automatically adjusts the working state of the compressor according to the change of the indoor cold and heat load to meet the requirements of the indoor cold and heat load.
3. There are 1 or 2 inverter compressors or 1 fixed-frequency compressor. There is radio frequency interference on the circuit, which has an impact on the computer. The introduction of the new air into the ceiling is the same as that of the condensate and the multi-connection. The design of the branch of the fluorine tube is reasonable. One machine is shared between the upper and lower layers. The pipeline requirements are higher, and it is easier to have the end internal effect when fully opened. Poor situation.
4. Fixed-frequency multi-connection type: The split air conditioner is concentrated into one outdoor unit, and there are three compressors in one to three. The refrigerant system is independent; the wall-mounted indoor unit is changed into a hidden type; the introduction of fresh air is difficult. It is a variant of split air conditioner. The noise of the fan in the bedroom is increased by 7 to 14 decibels from low to high, up to 50 decibels. Each bedroom needs to increase the ceiling of 1.2m or more, 0.6m wide and 0.3m high. Access holes are required; each internal machine requires a condensate drain line.
Third, the central air conditioning working principle - duct type unit
1. A fixed-frequency outdoor unit, a fixed-frequency indoor unit, which sends hot and cold air to each room through a duct, which can easily introduce outdoor fresh air; it is easier to concentrate on the air, such as humidification, and is cheap. The machine is designed to be reasonable. The noise of each room is only increased by 1 to 3 decibels. The bedroom does not need to be suspended. Each room can be controlled above the temperature set by the main thermostat. The temperature can be controlled. There can be a certain proportion of energy transfer. Achieve energy saving and speed up the cooling and heating speed of air conditioners.
2. During heating, the outdoor unit absorbs the refrigerant vapor from the condenser and delivers the vapor refrigerant to each indoor unit after being compressed. The indoor unit draws in air through the return air outlet disposed on the ceiling, performs heat exchange, and then enters the installation. Air is supplied to the indoor rooms through the diffusers on the air outlets in the ducts (lanes) in the ceiling of each room.
3. During cooling, the outdoor refrigeration unit absorbs the refrigerant vapor from the indoor unit and compresses and condenses it to deliver liquid refrigerant to each indoor unit. A new damper and exhaust damper are designed on the air duct (road), and the air can be replaced at a certain ratio to ensure the quality of the indoor air.
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