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Selection and design method of constant temperature and humidity equipment

Constant temperature and humidity equipmentSelection and Design methods of



Constant temperature and Humidity unit features: 1. The cooling capacity is generally between 10hp-200hp; 2. Equipped with electric heating and electrode humidification, heating is generally rich in wealth, air conditioner configuration humidification is small, need to be recalculated, generally need to increase one model or more configuration; 3. There is a rated air volume requirements; 4. There is a rated cooling water requirement; 5. The resistance of the condenser is generally 0.82-3.45mh2o;6. The size of the air conditioning unit is small; 7. Temperature control Range: 18~25, sensitivity: ±1; wet control range: 50~70, sensitivity: ± 5;8. Static pressure outside the machine is generally between 100~550; 9. Design conditions: inlet and air drying ball temperature 23 ℃, wet bulb temperature 17 ℃; Cooling water inlet temperature 30 ℃, effluent temperature 35 ℃;

Generally applicable in the case of temperature and humidity control or the entire design area is small. If the project area is large, the system is divided more, the position of the air-conditioning room is relatively dispersed, the management and system control will be inconvenient, not conducive to the unified distribution of energy, energy waste is more serious. In this case, the general area is greater than 2000m2, it is recommended to use Chiller + Combined Air treatment unit design form.

The use of constant temperature and humidity unit is divided into two pieces: 1. Constant temperature and humidity workshop, but no purification requirements; 2. Both constant temperature and humidity requirements, but also need to purify the level of control; room conditions: 1. The room is hot and hotter; 2. The room is less hot and the above two points are analyzed:

1. In terms of load considerations:

The air supply of the system is determined by the temperature difference between the apparent heat and air supply in the room, not by the total cooling capacity of the system (the apparent heat and latent heat of the room). Constant temperature and humidity unit refrigeration capacity of the general heat accounted for 50%, latent heat accounted for 50%, the equivalent of fresh air accounted for about 20% of the total air supply. When the room is more hot, and the amount of fresh air is small, the calculation of the air supply is larger, it can not be selected according to the total refrigeration capacity of constant temperature and humidity unit calibration of the refrigeration capacity to determine.

2. Consider the residual pressure from the outside machine:

Constant temperature and humidity, but no purification requirements system on the air conditioning unit external residual pressure requirements are not high, mainly to overcome the return of the wind pipe, valves, diffuser, initial filter, etc., the conventional unit can meet the requirements;

Both the constant temperature and humidity requirements, but also the need to purify the level control system on the air conditioning unit external residual pressure requirements are high, the general system of total resistance between the 1100pa~1400pa, mainly overcome the return air pipe, valve, diffuser, initial effect filter (initial resistance 50Pa, final resistance 100Pa), Medium effect Filter (initial resistance 150Pa, final resistance 300Pa), high efficiency filter (initial resistance 250Pa, final resistance 500Pa), etc., the conventional unit can not meet the requirements. If the system needs to set up two return air, clean constant temperature and humidity unit can not be selected; a return to the situation, constant temperature and humidity unit + pressurized box design form, because in the choice of pressurized fan model can not be with the constant temperature and humidity unit fan is difficult to match, different models, When the fan of different power is in series or parallel, the total air volume is not simply added, and the calculation is relatively complicated. It is recommended to design as a single fan system as far as possible in the general design process.