HVAC
HVAC (Heating, Ventilation and Air Conditioning) is one of the core disciplines in MEP (Mechanical, Electrical & Plumbing) design. It ensures thermal comfort, indoor air quality, and energy efficiency in buildings such as residential towers, commercial complexes, hospitals, hotels, and industrial facilities.
Role of HVAC in MEP
Within MEP coordination:
- Mechanical → HVAC system design
- Electrical → Power supply for HVAC equipment
- Plumbing → Condensate drainage, chilled water piping
Types of HVAC Systems Used in MEP
1. Split / VRF Systems
- Used in residential & small commercial buildings
- Energy efficient zoning
- Popular brands: Daikin, Mitsubishi Electric
2. Chilled Water System
- Used in large commercial buildings, malls, hospitals
- Includes chillers, cooling towers, AHU, pumps
3. Packaged Units
- Used in industrial and warehouse spaces
4. Central Air Handling Units (AHU)
- Supplies conditioned air through ducting system
HVAC Design Process in MEP
Step 1: Heat Load Calculation
- Based on occupancy, lighting, equipment load
- Standards used:
- ASHRAE
- National Building Code of India
Step 2: System Selection
- VRF / Chiller / DX system
- Energy efficiency consideration
step 3: Duct Design
- Airflow calculation (CFM)
- Static pressure calculation
- Friction loss calculation
- Velocity check
Step 4: Equipment Selection
- AHU capacity
- Chiller TR capacity
- Pump head calculation
Step 5: Layout & Coordination
- Duct routing
- Shaft sizing
- Clash detection using BIM
Key HVAC Design Calculations
- Heat Load (TR)
- Air Changes per Hour (ACH)
- CFM Calculation
- Duct sizing (Equal friction method / Static regain method)
- Pump head calculation
- Chilled water pipe sizing
HVAC Drawings in MEP
Typical deliverables:
- HVAC layout plan
- Duct routing plan
- Chilled water piping layout
- Equipment schedule
- Riser diagram
- BOQ
HVAC Design for Different Buildings
| Building Type | HVAC System Used |
|---|---|
| Residential | Split / VRF |
| Hospital | Chiller + AHU |
| Hotel | VRF / Chiller |
| Industrial | Packaged / AHU |
Software Used in HVAC MEP Design
- HAP – Load calculation
- Autodesk Revit – BIM modeling
- AutoCAD – 2D drafting