ELCCA Standard Systems

Topic: Standard HVAC systems used in typical Washington State schools analyzed in ELCCA reports

Mechanical Alternatives

Displacement Ventilation: Low-velocity floor diffusers, ceiling return for classrooms. Fan powered VAV for administrative areas, constant volume air handler for multipurpose room. Gas-fired instantaneous 95% efficient hot-water condensing boilers provide heating and domestic water needs. DDC controls.

Centralized Air Handlers & Zone Duct Coils: Constant volume centralized air handlers with zone duct heating coils for all areas. Gas-fired 80% efficient cast iron boiler. Gas-fired 80% efficient 100 gallon domestic hot-water heater. DDC controls.


High-Performance & Renewable Alternatives

Ground Loop Heat Pump: High-lift high-efficiency geothermal ground source heat pumps provide both heating and cooling for all areas. Gas-fired instantaneous 95% efficient hot-water condensing boilers provide domestic water needs. DDC controls. Code minimum ventilation. This is also the Renewable Alternative.