Tuesday 9 February 2016

HVAC DESIGN METHODS

The overall design steps are described in the following list. Throughout the
execution of this list, certain decisions are made that may affect other trades. It is important that
this coordination be made in a continuous and consistent manner.

Step 1. Determine Zones
Step 2. Calculate Room by Room Loads
Step 3. Select/size Equipment
Step 4. Layout duct system
- Locate FAU(s)
- Locate grilles and registers
- Route ducts
- Sub zones (trunks)
Step 5. Determine operating conditions
- Static pressure
- Total CFM
- Equivalent lengths
- Friction rates
Step 6. Size ducts
- Room air flow is proportional to room load
- Friction rate and room air flow determine duct size
Step 7. Final touches
- Locate thermostat
- Locate condenser

Further steps will be updated soon....
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HVAC is the technology of indoor and vehicular environmental comfort. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, (heating,ventilating and air-conditioning & Refrigeration) or ventilating is dropped as in HACR (such as the designation of HACR-rated circuit breakers). HVAC is important in the design of medium to large industrial and office buildings such as skyscrapers, onboard vessels, and in marine environments such as aquariums, where safe and healthy building conditions are regulated with respect to temperature and humidity, using fresh air from outdoors. Ventilating or ventilation (the V in HVAC) is the process of "exchanging" or replacing air in any space to provide high indoor air quality which involves temperature control, oxygen replenishment, and removal of moisture, odors, smoke, heat, dust, airborne bacteria, and carbon dioxide. Ventilation removes unpleasant smells and excessive moisture, introduces outside air, keeps interior building air circulating, and prevents stagnation of the interior air. Ventilation includes both the exchange of air to the outside as well as circulation of air within the building. It is one of the most important factors for maintaining acceptable indoor air quality in buildings. Methods for ventilating a building may be divided into mechanical/forced and natural types.