Ventilation strategies in HVAC

 Here are some common ventilation strategies:

1. Natural Ventilation: 

Uses natural airflow, wind, and temperature differences to ventilate buildings.

2. Mechanical Ventilation: 

Employs fans, blowers, and ducts to circulate and exchange air.

3. Hybrid Ventilation: 

Combines natural and mechanical ventilation strategies.

4. Displacement Ventilation: 

Introduces fresh air at floor level, displacing stale air upwards.

5. Dilution Ventilation: 

Dilutes pollutants with fresh air, rather than removing them.

6. Exhaust Ventilation: 

Removes stale air and pollutants from buildings.

7. Supply Ventilation: 

Introduces fresh air into buildings.

8. Balanced Ventilation: 

Provides equal rates of exhaust and supply ventilation.

9. Task Ventilation: 

Provides ventilation specifically for workstations or tasks.

10. Spot Ventilation: 

Focuses ventilation on specific areas or sources of pollution.

11. Heat Recovery Ventilation (HRV): 

Recovers heat energy from exhaust air and transfers it to fresh air.

12. Energy Recovery Ventilation (ERV): 

Recovers both heat and moisture energy from exhaust air.

13. Demand-Controlled Ventilation (DCV): 

Adjusts ventilation rates based on occupancy, humidity, and pollutants.

14. Mixed-Mode Ventilation: 

Combines natural and mechanical ventilation, adjusting to changing conditions.

15. Personal Ventilation: 

Provides individualized ventilation for occupants.

These ventilation strategies can be applied in various combinations to achieve optimal indoor air quality, comfort, and energy efficiency.