best practices manual-HVAC - download pdf or read online

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Run the chillers with lowest operating costs to serve the base load. Link Chiller control system to the Building Automation System to maximize savings. Permit Lower Condenser Pressures during Favourable Ambient Conditions Favourable ambient conditions reduce cooling air or cooling water temperatures, which will reduce condensing temperatures and pressures, thus reducing the compressor power. The control systems may set to allow the machines to operate at lower condenser pressure. Optimise Water/Brine/Air Flow Rates Optimise condenser water flow rate and refrigerated water/brine flow rate to maintain the design temperature difference across the chillers and condensers.

Under floor air supply through an under floor plenum is an emerging concept that has the potential to save energy. In this arrangement ducting is eliminated and the air is supplied to a common plenum below the floor. Air outlets with controls are provided near the work spaces which can be controlled as per individual requirement. Since the air is being supplied very close to the user, the supply air temperature settings can be raised to about 17ºC to 20ºC. The air will pick-up heat and rise into the return air plenum above the ceiling and return at a temperature of about 25ºC to 30ºC.

The air conditioning system comprised 56 nos. 7. Replacement of air cooled condensers by water cooler condensers could reduce the specific energy consumption by about 40%. 6 Reducing Ventilation Heat Load Ventilation is required to provide healthy conditions to the occupants of air conditioned rooms. About 15 cfm per person ventilation air has to provided. In India, the issue of Indoor Air Quality is usually ignored. Even if ventilation ports are provided, these are kept closed and ventilation is usually only due to door openings.

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best practices manual-HVAC


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