Single-channel variable air volume air conditioning system
Single-channel variable air volume air conditioning system
Single-channel variable air volume air-conditioning system consists of single-channel variable air volume terminal device, centralized air-conditioning unit whose blower adopts speed regulation, air duct system and control system. Single cooling type single air duct variable air volume air conditioning system, the air duct formed between the primary air outlet and the air supply outlet is end-mounted...
Text label: Single-channel variable air volume air conditioning system, clean room pharmaceutical cleanroom purification system
Single-channel variable air volume air conditioning system
Single-channel variable air volume air-conditioning system consists of single-channel variable air volume terminal device, centralized air-conditioning unit whose blower adopts speed regulation, air duct system and control system. In the single-cooling single-channel variable air volume air conditioning system, the air channel formed between the primary air outlet and the air supply outlet is the only air channel in the terminal device. In the terminal device, there is only one channel from the primary air outlet to the air supply outlet, and no other The branch channel is only used to supply cold air, and there is no other reheating device such as electric heating or hot water coil in the terminal unit. It is composed of a single-cooling single-air duct variable air volume terminal device and a centralized air-conditioning unit including a speed-adjustable blower; each different air-conditioned room is equipped with a single-cooling air-duct variable air volume terminal device and a matching air supply outlet; each different The single-cooling single-air duct variable air volume terminal devices in the air-conditioned room are controlled by the matching thermostat; when the entire system is more complex, the number of control points is large, and the air-conditioning area is heavily loaded, so it can be used in the central air-conditioning unit part. The exhaust fan, the exhaust port and the exhaust air door constitute the exhaust link. In the single-cooling single-channel VAV air-conditioning system, the air handling unit is the same as the constant air-volume air-conditioning system. The supply air volume sent to each zone or room is controlled by the variable air volume terminal device, and each variable air volume terminal device can carry various The air supply port, when the indoor conforms to the change, the variable air volume terminal device adjusts the air supply volume according to the indoor temperature to maintain the indoor temperature. During operation, as the load decreases, the air volume of the single-cooled single-air duct variable air volume terminal device decreases, and the total air supply volume of the inverter air conditioning unit also decreases accordingly. Since the air conditioning load of a building is only about 5% in the whole year At the time of full load, the rest of the time is operated under low load conditions, so the energy consumption of annual operation is greatly reduced.
The air volume adjustment of the terminal device in the single cooling single air channel variable air volume air conditioning system has a certain rule. As the sensible heat and cooling load in the temperature control area gradually decreases from the maximum value, the smaller the cooling load, the greater the degree of opening of the air valve. The smaller the air volume, the smaller the air supply until the minimum air volume; under the condition of the minimum air volume, it corresponds to a temperature value. Changes in the number and power of equipment and electrical equipment cause the indoor temperature to continue to decrease, so it is necessary to supply heat to the room. However, the single-cooling single-air duct variable air volume device has no reheating link, so heat load replenishment cannot be performed. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for dust-free workshops and GMP workshops.
Single cooling and reheating type variable air volume system is the whole variable air volume system including not only single cooling single air duct terminal device without reheating link, but also single air duct terminal device equipped with reheating link, reheating The link can be a hot water coil or an electric heater; a single air duct end device without a heating link is generally used in inner areas or air-conditioned rooms that require year-round cooling, while a single air duct end device with a heating link is mostly used in summer. In the outer area for cooling and heating in winter, in addition to air volume control, air supply temperature control is also required. In the variable air volume terminal device box, most products have no air volume sensor at the inlet. One of the control functions of a separate variable air volume box is to limit the minimum air volume, and the other is pressure compensation. The ratio of the minimum air volume to the design air supply volume shall be adopted according to the larger one: 20% of the design air volume of the variable air volume box; the design fresh air ratio of the variable air volume system; the ratio of the minimum air volume obtained by the speed change ratio of the air-conditioning unit.
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