Fans (supply, exhaust, return)
Fans (supply, exhaust, return) Fans play a crucial role in HVAC systems, responsible for: 1.Air circulation: Moving air through the system and building. 2.Pressure control: Maintaining pressure differences between spaces. 3.Heat transfer: Facilitating heat exchange between air and surfaces. Types of fans: 1.Supply fans: Deliver conditioned air to occupied spaces. 2.Exhaust fans: Remove air from occupied spaces. 3.Return fans: Draw air back into the system for re-conditioning. Key characteristics: 1.Flow rate: Measured in CFM (cubic feet per minute). 2.Pressure: Measured in inches of water gauge (in wg). 3.Efficiency: Measured by fan efficiency grade (FEG) or fan motor efficiency. 4.Noise level: Measured in decibels (dB). Factors affecting fan performance: 1.Ductwork and system design. 2.Fan selection and sizing. 3.Motor and drive type. 4.Maintenance and cleanliness. Maintenance tips: 1.Regular cleaning of fan blades an...