The characteristics, design methods and comparison of commonly used air-conditioning systems Part Three

2) Fresh air volume

The fresh air volume of the air conditioning system shall not be less than 10% of the total air supply volume, and shall not be less than the larger value of the following two air volumes:

Make up for exhaust and maintain the fresh air volume required for indoor positive pressure;

Guarantee the fresh air volume required by each person in each room every hour.

2. Forms and selection of commonly used airflow organization

The airflow organization in the air-conditioning area should meet the requirements of the design temperature and humidity in the air-conditioning area and its accuracy, the allowable airflow velocity in the work area, noise standards, air quality, indoor temperature gradient and air distribution characteristic index (ADPI) according to the purpose of the building. Requirements: uniform airflow distribution, avoiding short circuits and dead ends; design and calculation based on building characteristics, interior decoration, technology (including equipment heat dissipation factors) or furniture layout.

The airflow velocity in the personnel activity area of the air-conditioned room should not be too large, and the relationship between the allowable velocity of the indoor activity area and the indoor air temperature should be considered.

The main air supply form of the air-conditioned room: louver tuyere or slit-shaped tuyere side delivery; diffuser, orifice or slit-shaped tuyere top delivery; floor diffuser down-supply; nozzle air supply.

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Venetian air port or slit type air port side delivery: According to the characteristics of the air-conditioned room, the air supply and return ports can be arranged as one-sided up-supply and up-return, single-side up-send and down-return, double-side up-send and up-return, and both-sides up and down-return , single-side upsend, corridor return air and other forms.

1) For the air-conditioning system that only serves for cooling in summer, and the floor height of the air-conditioning room is low, the upward-sending and upward-returning method can be used;

2) The air-conditioning system mainly supplies hot air in winter, and when the floor height of the air-conditioning room is low, it is advisable to adopt the upper-supply and lower-return method;

3) The air-conditioning system used throughout the year should generally determine which method to use based on the calculation of the airflow organization;

4) Air-conditioned rooms with low storey height and large depth should adopt single-side or double-side air supply and attached jets.

Diffuser, orifice plate or slit-shaped air outlet top delivery: when the floor height is low, there is a suspended ceiling or a technical interlayer is available, round, square and slit-shaped diffusers can be used for top delivery; when the requirements are high, you can use Adopt air supply orifice plate and slit-shaped tuyere, etc. combined with architectural decoration to evenly top-supply.

Floor diffuser delivery: for air-conditioned rooms with high floor height and large depth, the floor diffuser can be used for delivery.

Nozzle air supply: air-conditioning places with tall spaces, such as auditoriums, gymnasiums, theaters, etc., can use the side or top delivery of the nozzle.

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