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Additional resources for ASHRAE Standard140 DOE22-eQUEST Results
Installed costs for duct systems can approach the cost of the HVAC unit itself, so there is often intense pressure to reduce duct system costs. However, the quality of the duct system can have a profound effect on the efficiency and comfort delivered by the HVAC system. Fan energy in small commercial buildings in mild climates can approach the cooling energy consumption. Duct losses through leakage and conduction can affect the efficiency of the system and the amount of cooling delivered to the space.
Roof insulation can be installed directly on the roof deck or roof interior surface, while ceiling insulation is generally applied on top of the drop ceiling (called “lay-in” insulation). When the insulation is applied to the roof, the plenum space between the roof and the ceiling is located within the thermal envelope of the building and the impacts of duct conductive losses and duct leakage on HVAC system efficiency is substantially less. Lay-in insulation generally has incomplete coverage due to lighting fixtures, HVAC diffusers, fire sprinklers, and other devices installed into the dropped ceiling grid that interfere with insulation installation.
Efficiency Loss due to Oversizing The reduction in system efficiency as the runtime decreases is shown below. 0, indicating no degradation due to cycling. 6 and the unit efficiency is reduced by about 10%. If the unit runs only 30% of the time, the efficiency is reduced by about 15%. , 1999. 8 1 Small HVAC System Design Guide Unit Selection Unit Selection SUMMARY Select rooftop units that meet CEE Tier 2 efficiency standards and employ features that improve the efficiency and reliability of the units, including premium efficiency fan motors, thermostatic expansion valves and factory run-tested economizers.