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HEATING VENTILATION & AIR CONDITIONING Design is a sub discipline of mechanical engineering that deals with the art of heating- air conditioning and ventilation systems of the building to achieve comfort.. The scientific design of HVAC system is critical to achieve an efficient and effective environmental control system within a liveable. The successful integration of building constraints- air movement conditions and equipment selection can positively impact system overall performance and decrease utility expenses and capital expenditures.To achieve the optimal design- one should need good analytical skills and up-to-date technical knowledge in the subject.
Comfort is a state of mind and is our profession.

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Role of an HVAC design engineer


  • Intro to HVAC- Applications- Human comfort range- Modes of heat transfer- Types of heat- Psychrometry- Refrigerants and refrigeration cycles- Pressure enthalpy diagrams- types of air conditioning systems- Understanding the codes and standards.
  • Kitchen ventilation system design- Kitchen ventilation system principles-types-design-document preparation.
  • Toilet ventilation system design: Non centralized ventilation system principle & design- Centralized ventilation system principle & design.
  • Car parking ventilation system: Non-centralized system principle & design-Centralized system principle & design- Unducted centrifugal and jet fans.
  • Softwares complying to the codes- Fundamentals of heating and air conditioning- Building survey- Outside and room design conditions- Space envelope and U factor calculation- Fresh air requirements- Factors of heat gain/ loss- Calculation of Tr- ADP- ESHF- Air flow rate- Heating capacity.
  • Heating and cooling load estimate: Carrier E20 manual method - Carrier e20 II method (HAP software).
  • Duct system: Air system sizing- Ducting terminology- Design parameters- Duct routing-Duct sizing by Velocity reduction method- Equal friction method- Static regain method.
  • ESP/Static pressure calculation (fan selection)- Fan laws- Backward and forward curved fans- Air change number per hour- Static and velocity pressure- Duct fitting coefficients- Fan selection curves- Brake horse power of fan.
  • Air terminals:Diffuser-Grill-Register-Louvre principles and selection.
  • Dampers : Fire dampers- VCD principle and selection.
  • Measuring devices- Pressure gauge & thermometer.
  • Non centralized AC systems- Window AC- Package AC.
  • Centralized AC systems: Package AC system design- VRF system- Ducted split AC- Chilled water system.
  • Chilled water system: Chiller principle & selection- Hydronic pipe sizing (manual and McQuay method)-Primary secondary piping system-Hydronic pump selection-Actuator valves-Cooling tower selection and performance-Condenser pipe system design-Condenser pump selection-Expansion tanks principle & design-Chemical Dosing.
  • Pump system design: Head calculations- Pump laws-Open and closed loop systems-Equivalent pipe length for valves and fittings-VFD enabled pumps- Primary secondary pumping systems.
  • Boiler system design- Boiler capacity- Energy consumption- Pipe sizing- Pipe materials and insulation.
  • VRV® or VRF system design- VRF system sizing -Two pipe and three pipe systems- Outdoor unit capacity- pipe sizing- VRV in ASHRAE- Variable water volume.
  • Cooling coil selection & design- Coil ADP- Sensible heat ratio.
  • Refrigerant pipe sizing.
  • Dehumidifier: Principle & selection.
  • Vapour absorption cycle: Concept-Application.
  • Cold storage principle and design:Refrigeration load estimate- Project requirements- Properties of storage commodity-Cold store architecture and purpose- Insulation level- Load estimation-Equipment selection.
  • Smoke suppression/containing system: Stairwell pressurization system principle and design.
  • Energy efficient HVAC: Star ratings-performance ratios- Insulating materials- Heat recovery systems- VFD- Under floor cooling- Geothermal systems- Wind towers.
  • Knowing the updates: Coordination with other services- Briefing design reports.
  • BOQ and documentation.
  • Draughting

    • Concepts of Drafting.
    • Introduction to AutoCAD- Commands of AutoCAD and familiarization.
    • Reading Architectural- Structural & RC plans (Plan- - Elevation- section).
    • Preparing Architectural plan- elevation- section.
    • HVAC Legends - Fixture placements.
    • Single and double line diagrams- Ducting and piping layouts -Duct fittings calculation and representation- Duct and pipe supports.
    • Machine layouts: Plan- Elevation- Section of AC machine rooms & Pump rooms.
    • Drawing: Conceptual drawings - Shop drawings.