1. Airflow; The total air volume of the dust-free workshop and the air volume of a single high-efficiency air supply outlet;
symbol: L
Standard unit: m3/h (cubic meters per hour, also written as CMH)
Other commonly used units: 1m3/min (cubic meters per minute, also written CMM)=1 m3/h× 60; 1CFM (ft3/min, cubic feet per minute)& amp; 1m3/h× 1.7
Example of Unit Conversion: If the air volume is 500CFM, the air volume is 850 m3/h; If the air volume is 500CMM, the air volume is 30000CMH.
2. Generally, central air conditioning is used as the cooling system for dust-free workshops.
symbol: Q
Standard unit: kw (kilowatt);
Other commonly used units: 1Kcal/h (kilocalories per hour)=1kw/860; 1RT (cold ton)=3024 Kcal/h; 1HP (horsepower)& amp; 2700 Kcal/h (rarely encountered).
The unit of heat is the same as the unit of cold, with the symbol Q, and when both units are used together, Q cold and Q hot are used to distinguish them.
3. Compared to dust-free purification workshops with higher requirements for humidification and dehumidification, purification workshops with constant temperature and humidity are required.
symbol: G
Standard unit: kg/h (kilograms per hour)
4. Residual pressure and total pressure, etc;
symbol: H or P
Standard unit: Pa (pascal)
Other commonly used units: 1mmH2O (1mm water column)=10a
Total pressure=static pressure+dynamic pressure. The dynamic pressure is relatively small, and the static pressure is approximately equal to the total pressure. Simply put, the total pressure is the total pressure at the outlet of the fan.
In a modular air handling unit, some people understand that the resistance inside the unit plus the resistance of the air duct is the total pressure.
The common understanding of residual pressure is that it can overcome the total resistance of the air duct wall outside the unit.
Full pressure is more commonly encountered in combination air handling units, while residual pressure is more commonly encountered in air conditioning cabinets.
5. Motor power
symbol: N
Standard Unit: Kw (Kilowatt)
Other common units: HP (horsepower)
1HP=0.735kw
6. Fan size
Unit: inches (commonly known as inches); Millimeter (mm);
1 inch=25.4mm
Fan size usually refers to the diameter, such as 9 "and 225. Generally, the diameter and length of a fan are equal, such as model A9-9 (the number in front is the diameter, and the number behind is the length)
7. Motor and fan speed
symbol: rpm
Unit: revolutions per minute
The speed of thefan is usually around 1000 rpm, with smaller models having higher speeds and larger models having lower speeds; Rated speed of motor: 1450 rpm (4-pole), 2900 rpm (2-pole), 90 rpm (6-pole), 720 rpm (8-pole).
8. Temperature and humidity
(1) Temperature
symbol: T
Unit: ℃
Dry bulb temperature symbol: DB, wet bulb temperature symbol: WB, dew point temperature symbol: LB;
(2) Humidity
Relative humidity symbol:&Phe; Unit:% (percentage);
Moisture content (absolute humidity) symbol: d, unit: g/kg (kilograms per gram, kilograms represent air, grams are water vapor)
9. Filter efficiency;
Unit:%
Initial Effect: Approximately 35%
Medium efficiency: about 65%;
Efficiency: 99.99%
Filter level: initial efficiency G3 and G4, medium efficiency F5, F6, etc. Efficient H13, H14
10. Other commonly encountered units; Parameters of central air conditioning water system
Water flow unit: L/min (liters per minute), 1 m3=1000L
The measurement units are mostly in millimeters (mm), with 1m (m)=100cm (cm)=1000mm (mm);
Area unit (such as surface cooler area): sqm (square meter)
Number of fins forsurface cooler: 10 per inch
Wind speed (airflow velocity) unit: m/s (meters per second)
Purification level: Level 100, Level 1000, Level 10000, Level 100000, Level 300000
Noise Unit: dB (A) (Decibel)
