Air-conditioning partition and system configuration of 100,000-class clean workshop

Air-conditioning partition and system configuration of class 100,000 clean workshop

1. Example of air-conditioning partition and design of clean pharmaceutical cleanroom

In general, in the design of variable air volume air conditioning system, the characteristics of the air conditioning area are first divided into inner and outer zones. For air-conditioned rooms with larger depths, it should be divided into inner and outer areas, of which the outer area can be 3~5...

Text label: Class 100,000 clean pharmaceutical cleanroom, air conditioning system for clean workshop

Air-conditioning partition and system configuration of 100,000-class clean workshop

1. Example of air-conditioning partition and design of clean workshop

In general, in the design of variable air volume air conditioning system, the characteristics of the air conditioning area are first divided into inner and outer zones. For the air-conditioned room with larger depth, it should be divided into inner and outer areas, of which the outer area can be 3~5m deep (distance from the outer wall or outer window). After zoning, the system configurations of 'inner and outer areas are independent and set up with different air conditioning systems' and 'inner and outer areas are set to the same air conditioning system' can be adopted.

“Inner and outer areas are independent and set up different air-conditioning systems” means that the inner area usually adopts a single-duct variable air volume air-conditioning system of a single-cooling type air-conditioning unit, and the outer area can use a cooling-heating type air-conditioning unit. Single duct variable air volume air-conditioning system and dual-air duct variable air volume air-conditioning system for hot and cold dual air-conditioning units.

“The inner and outer areas are set as the same air-conditioning system” means that the inner area usually adopts a single-duct variable air volume air-conditioning system of a single-cooling air-conditioning unit, and the same single-duct variable air volume air-conditioning system in the outer area and the inner area is used. On the basis of the system air supply main pipe, the auxiliary heating system of the surrounding area is set up.

2. Air conditioning partition and system configuration of clean workshop

1. Air conditioning partition and system configuration example

The standard floor plane of a clean workshop is very regular, and the inner and outer areas are more obvious. Partitioning situation: The indoor area within 5m from the outer wall of the clean pharmaceutical cleanroom is used as the outer area, and the rest of the office area is used as the inner area, and there are no two areas according to the east-west orientation. The air-conditioning units are set separately according to the inner and outer zones, and the water system is also set according to the above-mentioned zones of the air-conditioning air system. The entire outer area provides cooling in summer and heating in winter, and the water system is switched between two pipes. The air-conditioning method is AHU+VAVBox all-air method: fresh air is sent to each workshop floor through vertical pipes. On the fresh air branch pipe of each floor, according to the fresh air requirements of each clean area, set a VAVBox with corresponding air volume opening to ensure the fresh air volume of this floor, and set up an air outlet in each house to introduce indoor exhaust air into the underground machine room and garage as a For air supply, it not only balances the indoor air pressure and maintains the indoor air quality, but also effectively improves the air quality of the underground machine room and garage. Zhongjing Global Purification can provide supporting services such as consultation, planning, design, construction, installation and transformation of purification workshops and sterile rooms.

The VAV system in the clean area adopts the form of single air duct, which has better energy saving compared with the fan moving knife system which is widely used, and also better avoids the common cold and heat offset phenomenon of other systems. The end of the variable air volume air conditioner is a pressure-independent throttling type VAVBOX with a Lon bus communication interface and a physical damper valve position inversion, and a display that can display the indoor temperature, set temperature and temperature reset. System control is slightly variable static pressure method. Since the VAV terminal controller has a good communication connection with the AHU field controller (DDC) in the air-conditioning room, the field controller can set the parameters after obtaining the measured air volume of each terminal device, the measured value of room temperature and the valve position information. The VAV system adopts the variable static pressure control strategy for real-time control, and uses the corresponding relationship between the sum of the air volume setting values u200bu200bof each terminal device and the fan speed, Find the appropriate air supply volume, and at the same time find out the appropriate air supply temperature according to the outdoor temperature and humidity or the larger and smaller air volume of each VAV terminal device, so as to obtain more appropriate air supply parameters to ensure that each air valve is as close as possible. The larger opening state saves the energy of the fan to the greatest extent, and avoids the problems of noise and system oscillation caused by a large number of air valves closed.

2. Precautions for air-conditioning partition and system configuration in clean workshop

The inner and outer areas are subdivided into several temperature control areas, each temperature control area is equipped with a variable air volume terminal, the cooling and heating loads of each area are calculated hourly, and the larger primary air volume is calculated according to the larger cooling load and the supply air temperature difference Select the end of the VAV, and select the air-conditioning box according to the maximum hourly load of each area and the temperature difference of the supply air.

When the temperature control area is divided, the owner or the decoration unit should be asked to provide detailed division information as much as possible, otherwise the temperature control area is divided too large, the terminal equipment will be too large, and it will affect the temperature control, temperature accuracy and noise and other issues; However, if the temperature control area is too small, there will be too many terminal equipment and control equipment, and the investment will be too large.

The fan-driven series variable air volume terminal device is selected for the outer area, and the single-channel variable air volume terminal device is selected for the inner area. When the room load in the outer area is reduced, in order to maintain the indoor set temperature, the primary air is reduced accordingly, and the secondary air is increased, but the total air supply volume remains unchanged, the indoor airflow organization is relatively stable, the ventilation effect is good, and people's comfort is better. Most rooms have a ventilation rate of more than 10 times/h: the cooling load of the rooms in the inner area is relatively stable, the air supply volume does not change much, and the ventilation rate of the rooms is mostly 6 times/h.

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