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Additional info for CEC Small HVAC Design Guide
SELECT AIRFLOW RATE TO MEET SENSIBLE LOADS Increasing the flowrate can extract extra sensible cooling capacity out of the unit, allowing the selection of a smaller “nominal” unit. The cooling capacity of most packaged air conditioners is based on a nominal flowrate of 400 cfm/ton of cooling capacity. Nominal flowrates in packaged equipment are selected to provide adequate dehumidification in climates that are more humid than California. Increasing the flowrate can extract extra sensible cooling capacity out of the unit, allowing the selection of a smaller “nominal” unit.
The design changes studied along with the graph legends for Figure 7 are shown in Table 6: 21 Small HVAC System Design Guide Integrated Design Table 6. Design Changes for Computer Simulations Design Change Legend Insulation location moved from ceiling to roof Roof insul Energy-efficient lighting EE Ltg High-performance glass on the West orientation HP glass W High-performance glass on the South orientation HP glass S High-performance glass on the East orientation HP glass E High-performance glass on the North orientation HP glass N High-reflectivity roofing material Cool roof Duct leakage sealing Leak seal Reducing HVAC system size to correspond to reduced cooling loads Right sizing Energy-efficient rooftop unit EE unit Figure 7.
25 ton) cooling capacity. This capacity criterion was selected based on the size of unit commonly using dual cooling compressors. With integrated operation, the economizer reduces the mechanical cooling load, which can cause cycling problems in single compressor systems. 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Climate Zone Non-integrated Economizer Integrated Economizer Figure 16 shows the components used in an economizer system for small packaged rooftop units. The economizer controller receive signals from various sensors, and decides when the outdoor air dampers should fully open.