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The characteristics, design methods and comparison of commonly used air-conditioning systems Part One
The air conditioning system generally consists of air handling equipment and air delivery pipes and air distribution devices. According to the needs, many different forms of the system can be composed. Commonly used air conditioning systems in engineering include primary return air conditioning system, variable air volume (VAV) air conditioning system, fan coil unit + fresh air air conditioning system, water ring heat pump air conditioning system, variable refrigerant flow (VRV) air conditioning system, and household central air conditioning system. wait.
1. Primary return air conditioning system
In the air treatment process of the primary return air conditioning system, most occasions need to use a part of the return air. In the transition season, the proportion of fresh air volume should be increased, which is conducive to energy saving; but in summer and winter, the proportion of return air volume should be increased, and the proportion of fresh air volume should be reduced, so that the system operation will be more economical. But in fact, for the sake of sanitation, the fresh air volume cannot be reduced without limit. When designing an air-conditioning system, the largest of the three items that meet the hygiene requirements, meet the requirements of supplementary local exhaust, and maintain the positive pressure of the air-conditioned room is usually taken as the calculated value of the fresh air volume of the system. In addition, for most air-conditioning systems, when the fresh air volume obtained by the above method is less than 10% of the total air volume, it is also determined as 10%.
2. Variable air volume air conditioning system
The working principle of this system is that when the load of the air-conditioning room changes, the terminal device of the system automatically adjusts the air supply volume sent to the room to ensure that the room temperature remains within the design range, thereby reducing the air supply volume of the air-conditioning unit at low load. , the speed of the blower fan of the air-conditioning unit is also reduced to achieve the purpose of energy saving.
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3. Fan coil unit + fresh air air conditioning system
The fan coil + fresh air air conditioning system is a main form of the air-water air conditioning system. As the name suggests, it can be divided into two parts: one is the fan coil unit set up according to the room. The second is the fresh air system, usually the fresh air is cooled and heat-treated to meet indoor hygiene requirements.
1) The form of the fan coil unit
In terms of the air flow form, the fan is located on the downwind side of the coil, and the air is first processed by the coil, and then sent to the air-conditioned room by the suction type; the fan is on the upwind side of the coil, and the fan sucks the indoor air and sends it to The coil is exchanged for cold and heat, and then sent to the press-out type of the air-conditioned room. The characteristics of the suction type are: the air intake of the coil is uniform, the cooling and heating efficiency is relatively high, but the temperature of the hot water supplied by the coil cannot be too high; and the extrusion type is currently the most widely used structural form.
According to the installation form, there are vertical surface installation, horizontal surface installation, vertical concealed installation, horizontal concealed installation, and ceiling type (also known as embedded).
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