Hot and cold variable air volume air conditioning system in dust-free sterile clean workshop

Hot and cold variable air volume air conditioning system in dust-free sterile clean workshop

1. Structure and operation of hot and cold type single air duct variable air volume system in dust-free sterile clean workshop

The terminal device used in the cooling and heating single air duct variable air volume system is the same as that of the single cooling single air duct system. The operating conditions of the system include cooling and heating conditions. ...

Text label: sterile clean pharmaceutical cleanroom, dust-free sterile clean pharmaceutical cleanroom, hot and cold single air duct variable air volume air conditioning system

Cooling and heating variable air volume air conditioning system in dust-free and sterile clean workshop

1. Structure and operation of hot and cold type single air duct variable air volume system in dust-free sterile clean workshop

The terminal device used in the cooling and heating single air duct variable air volume system is the same as that of the single cooling single air duct system. The operating conditions of the system include cooling and heating conditions. The system is mainly used in the outer area for cooling in summer and the outer area for heating in winter, and is also widely used in small dust-free and sterile clean workshops without partitions.

The structural characteristics and operating conditions of the cooling and heating type single air channel variable air volume system are as follows:

(1) Only use non-reheat single duct end devices.

(2) The cooling and heating type single air duct variable air volume system is the configuration of no reheat single air duct terminal device + inverter air conditioner unit.

(3) There are two operating conditions: summer and winter conditions. Summer working conditions: supply cold air to the air-conditioned room (outside the building or a small dust-free sterile clean pharmaceutical cleanroom), the cold air comes from the inverter air-conditioning unit, and the cold water coil of the air-conditioning unit circulates 7°C chilled water; winter working condition: to The air-conditioned room supplies hot air, the hot air comes from the inverter air-conditioning unit, the cold water coil of the air-conditioning unit is closed, and the hot water coil circulates 60°C air-conditioning hot water.

(4) Whether it is supplying cold air or supplying hot air, the air volume is adjusted by adjusting the opening of the air valve of the terminal device, thereby controlling the temperature in the air-conditioned room.

2. Analysis of operating conditions

In summer, when the cooling capacity needs to be supplied to meet the cooling load demand of the air-conditioned room, the cold air prepared by the inverter air conditioner unit is sent to the terminal device through the air supply duct, and the cold air is sent out from the air outlet through the air volume adjustment. This is the summer working condition ( Cooling conditions); in winter, heat needs to be supplied to meet the heat load demand of the air-conditioning area, and the hot air prepared by the inverter air-conditioning unit is sent to the VAV through the air supply duct

At the

Box, the hot air is sent out from the air outlet through the air volume adjustment, which is the winter working condition (heating working condition).

(1) Cooling condition. For the summer condition, the cooling condition is divided into two stages: there is a cooling transition condition before entering the stable cooling condition, and in the cooling transition condition, the valve opening of the terminal device becomes smaller , adjust the air supply volume also becomes smaller, adjust downward from the larger air volume to the very small air volume and keep it at the small air supply volume, at this time enter the cooling condition, in the cooling condition, pass through the end The air valve adjustment of the device can adjust the air supply volume from a small air supply volume to 100% of a large air supply volume. The temperature in the air-conditioned room varies greatly under the cooling transition condition, and the temperature in the air-conditioned room is basically stable under the cooling condition. Zhongjing Global Purification undertakes the design, decoration, construction, purification equipment installation and other supporting services of indoor clean rooms, dust-free workshops, sterile workshops, purification workshops in various industries.

(2) Heating condition. For the heating conditions in winter, there are also heating transition conditions. As the heat load in the air-conditioned room decreases, the terminal device adjusts the air supply correspondingly to a small amount. After reaching a very small air volume, it remains at a very small air volume. At this time, it enters the heating condition.

3. Operating characteristics and use environment

(1) Running characteristics.

1) The conversion of cooling and heating is done in the inverter air conditioner unit. A two-pipe variable air volume air-conditioning unit can be used, and through a set of coils, cold air is supplied to the air-conditioned area by transporting chilled water through the coil in summer, and hot air is supplied to the air-conditioned room by transporting air-conditioned hot water through the coil in winter.

2) Since the hot and cold single air channel variable air volume system is an all-air system, the hot water pipe does not enter the air-conditioning area, so there will be no problems such as flooding.

3) It cannot supply heating while supplying cooling; it cannot supply cooling while supplying heat.

(2) Use the environment.

Cooling and heating type single air duct variable air volume system is suitable for the following environments:

1) Small dust-free sterile clean workshop without partition.

2) The outer area of u200bu200blarge, larger and medium-sized dust-free and sterile clean workshops.

3) It is not allowed to lay water pipes or air-conditioning areas where it is difficult to lay water pipes.

Of course, there are also some obvious deficiencies in the hot and cold single air channel variable air volume system. When hot air needs to be supplied in winter, due to the dynamic change of heat load, such as the number of personnel in the air-conditioning area is significantly reduced, the demand for fresh air volume, heat load and hot air supply decrease, but the actual situation is that the internal heat and cooling load It also decreases, and the net heat load (the difference between the building heat load and the internal heat and cooling load) increases instead, resulting in an increase in the air supply volume, the air supply volume increases, and the fresh air volume will also increase.

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