Heating, Ventilation and Air Conditioning (HVAC) accounts for a significant portion of a commercial building’s energy use and represents an opportunity for considerable energy savings. This Tip Sheet acts as a primer on energy efficient HVAC systems and proven technologies and design concepts which can be used to comply with the HVAC provisions in Energy Conservation Building Code.
As the climate Map of India(ECBC 2007) shows, most of India falls mainly under three climatic zones(hot-dry, warm humid and composite) requiring cooling of building for almost 6-8months to provide thermal comfort to the occupants. All of this comes with significant energy consumption and costs. Both need to be addressed while designing any building.
Heating Ventilation and Air Conditioning 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, odours, smoke, heat, dust, airborne bacteria, carbon dioxide, and other gases. Ventilation removes unpleasant smells and excessive moisture, introduces outside air, keeps interior building air circulating, and prevents stagnation of the interior air. By the means of HVAC it can save the energy up to 20-30%.
The lack of a direct relationship between the Global Warming Potential (GWP) and the Ozone Depletion Potential (ODP) creates a challenge in developing a rating system that allows the two environmental factors to be considered together, as they should be in evaluating the environmental
Impact of an HVAC system. In the absence of perfect or ideal refrigerant we should follow a ‘trade-off’ approach to identify a better combination of HVAC equipment and its refrigerants to facilitate optimum environmental impact in terms of GWP and ODP per unit of cooling capacity.