VAV vs CAV — What’s the Difference? VAV (Variable Air Volume) and CAV (Constant Air Volume) are two HVAC air distribution strategies: CAV delivers a fixed airflow with varying temperature, while VAV varies airflow to match load, saving energy and offering better zone control. 🔹 Constant Air Volume (CAV) Operation: Supplies a fixed airflow rate at all times; adjusts supply air temperature to meet load. Advantages: Simple design and controls Lower first cost (approx. $5–10 per CFM ) Reliable for spaces needing constant ventilation (labs, hospitals, clean rooms) Limitations: Energy inefficient (requires reheating cooled air) Limited zone control (system-wide only) Higher operating costs over time 🔹 Variable Air Volume (VAV) Operation: Maintains nearly constant supply air temperature; airflow varies by zone demand using VAV boxes. Advantages: Significant energy savings ( 30–50% compared to CAV ) Individual zone control Lower operating costs; payback in 3–7 years Limitations: High...
AHU ASSEMBLY – QUICK SUMMARY
An Air Handling Unit (AHU) is assembled in sections to condition and circulate air in HVAC systems. Proper assembly ensures airtight construction, vibration control, and efficient airflow.
📦 MAIN AHU ASSEMBLY PARTS
• Base Frame & Anti-vibration pads
• Bottom Panel / Drain slope
• Side Panels (Double skin insulated)
• Cooling / Heating Coil Section
• Filter Section (Pre / Fine / HEPA)
• Fan & Motor Section
• Access Doors & Inspection Window
• Damper / Mixing Box
• Top Canopy (Weather protection)
• Flexible connection & accessories
🔄 TYPICAL ASSEMBLY SEQUENCE
Base Frame → Bottom Panel → Side Panels → Coil Section → Filter Section → Fan Section → Top Canopy → Doors → Final Alignment
⚙️ IMPORTANT CHECKS
✔ Base level & vibration isolator
✔ Drain slope properly installed
✔ Panels air-tight sealing
✔ Fan alignment & rotation check
✔ Filter installation direction
✔ Damper operation check
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