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...
The refrigeration cycle and reversing valve operation in a heat pump system, which provides both heating and cooling.
The refrigeration cycle and reversing valve operation in a heat pump system, which provides both heating and cooling. The compressor pressurizes the refrigerant, sending it through the discharge port toward the outdoor coil (condenser in cooling mode, evaporator in heating mode). A metering device (expansion valve) regulates the refrigerant flow before entering the indoor coil, which functions as either an evaporator or condenser depending on the mode. The reversing valve directs the refrigerant flow, switching between heating and cooling modes. In cooling mode, heat is expelled outdoors, while in heating mode, heat is absorbed from outside and transferred indoors. The control circuit and solenoid valve regulate the reversing valve operation based on thermostat signals. This system allows for energy-efficient temperature control in all seasons, making heat pumps a sustainable HVAC solution.
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