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HVAC Sysems & AHU

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HVAC Sysems & AHU

  1. 1. Eng. Ahmed Hussein 1
  2. 2. Introduction to HVAC Systems  Objective Comfort Zone  Temperature 22 °C 26 °C  Relative Humidity 40 % R.H 60 % R.H  Comfort Zone 24 °C & 50 % R.H HVAC Systems, AHU Control & Troubles1hooting 2
  3. 3. Indoor Air Quality (IAQ) HVAC Systems, AHU Control & Troubles1hooting 3
  4. 4. HVAC System Components Where’s the fresh air duct ?!?!! HVAC Systems, AHU Control & Troubles1hooting 4
  5. 5. 1. Chiller HVAC System Components HVAC Systems, AHU Control & Troubles1hooting 5
  6. 6. HVAC System Components 2. Cooling Tower HVAC Systems, AHU Control & Troubles1hooting 6 Chiller Refrigerant Cycle Condenser Compressor
  7. 7. HVAC System Components 3. Boiler HVAC Systems, AHU Control & Troubles1hooting 7
  8. 8. HVAC System Components 4. Air Handling Unit (AHU) HVAC Systems, AHU Control & Troubles1hooting 8 Supply Duct Fan Vibration Connection Cooling Coil Filter Section Return Duct
  9. 9. HVAC System Components 5. VAV (Variable Air Volume) HVAC Systems, AHU Control & Troubles1hooting 9
  10. 10. HVAC System Components 6. Ductworks & Air Terminals HVAC Systems, AHU Control & Troubles1hooting 10
  11. 11. AHU Control & Troubleshooting  Control Concept 1. Sensor 2. Controller Device (Brain) 3. Actuator HVAC Systems, AHU Control & Troubles1hooting 11 Sensor Controller Actuator Input Output Set Point (Value)
  12. 12. AHU Control & Troubleshooting HVAC Systems, AHU Control & Troubles1hooting 12 Sensor Controller Actuator Input Output 1- Thermostat 2- Pressure Gauge 3- R.H % Sensor 4- DPS 5- Flow Switch BMS DDC MCC 1- Motorized Damper 2- Two-way Valve 3- Three-way Valve 4- VSD
  13. 13. AHU Control HVAC Systems, AHU Control & Troubles1hooting 13 Exhaust Air Supply Air Return Air Return Fan Supply Fan E H M M M M MCC DDC AO T TDPS DPS AO AO AO DO DI AI AI AI AI AO

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