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19 Small HVAC System Design Guide Integrated Design Figure 6. Lay-in Insulation Lay-in insulation in a warehouse-to-office conversion. Note the poor insulation coverage and ductwork located in an unconditioned space. INTEGRATED DESIGN EXAMPLE These seemingly unrelated aspects of building design can have a profound effect on the size and cost of the HVAC system. Architects and design/build contractors should consider including these load avoidance strategies in their designs to achieve superior performance.

In duct systems with branches having widely varying pressure losses, the modified equal friction method is used to design systems that are closer in balance (ACCA, 1990). Design friction rates for shorter duct runs are increased in an attempt to design each branch with the same total pressure 49 Small HVAC System Design Guide Distribution Systems loss. This method provides a design that is better balanced, but balance dampers must still be installed since it is not possible to provide a truly selfbalanced system using this method.

Table 11 compares CEE Tier 2 and the efficiency provisions of the California Title 20 Appliance Standards and the Title 24 Non-residential Building Efficiency Standards. Table 11. 3 EER 11 EER 7% High efficiency units available from several major manufacturers meet or exceed the CEE Tier 2 efficiency specifications. Table 12 shows several examples. Table 12. 7% Designers should consider both the rated full-load energy efficiency ratio (EER), and the seasonal energy efficiency ratio (SEER) when selecting a unit.

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