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Heat Recovery Ventilation (HRV) - How It Works

Gul Bahar Shah
  Heat Recovery Ventilation (HRV) - How It Works A Heat Recovery Ventilator (HRV) is a mechanical ventilation system that recovers heat from exhaust air and transfers it to incoming fresh air without mixing the two air streams. ✦ Main Components 1. Supply Fan - Draws fresh air from outside. 2. Exhaust Fan - Removes stale indoor air. 3. Heat Exchanger Core (Aluminum / Polymer) - Transfers heat between air streams. 4. Air Filters - Remove dust and contaminants. 5. Condensate Drain - Removes moisture formed during heat exchange. 6. Dampers - Control airflow direction and volume. ✦ Working Principle 1. Fresh outdoor air enters the HRV through the intake duct. 2. Stale indoor air is simultaneously extracted from the building. 3. Both air streams pass through a heat exchanger core. 4. Heat transfers from the warmer air to the cooler air without mixing the air streams. 5. The system pre-heats or pre-cools the fresh air before it enters the room. ✦ Key Benefits ✓ Improves indoor air qualit...
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MEP Parking Smoke management:

Gul Bahar Shah

 MEP Parking Smoke management:

Proper application of car parking CO detection systems ensures occupant safety and regulatory compliance through systematic carbon monoxide monitoring, appropriate alarm thresholds, and comprehensive integration with ventilation and fire alarm system.
Fire Scenario:
Fire alarm mode overrides the CO system.
Sequence of operation:
Fire Alarm Panel
 │
▼
 │ Fire Alarm Signal
 ▼
BMS / HVAC Control Panel
 ├── Disable CO control
 ├── Start smoke exhaust fans
Exhaust fans → FULL SPEED
Make up Fresh air supply fans → ON
Smoke dampers → OPEN
Jet fans (if installed) → ON
▼
 └── Open smoke dampers

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