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Retrofit Concept
Main thrust was to change the strategy used in design and operation of the HVAC system in the High School. The project included replacement of the existing ventilation system, installation of a direct/indirect evaporative heating and cooling system while introducing 100% outside air. Other energy efficiency improvements made in the school included changing of green house operation from propane to natural gas, changing kitchen equipment to natural gas, conversion of booster heater from electricity to natural gas and changing of the domestic hot water system from steam to a direct fired system. Upgrading of lighting throughout the building is also part of this total upgrade.
Building Construction
No Building Components involved with this renovation project.
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Heating / Ventilation / Cooling and Lighting Systems
The heating system was converted from steam to hot water and domestic hot water was changed from steam to direct gas fired. Green House heating was changed from propane to natural gas and 10 pieces of kitchen equipment was changed from electricity to natural gas. The HVAC system is a hybrid natural and mechanical; indiect/direct regenerative system using 100% outside air using the exhaust air to pre-heat the outside air through heat exchangers.
The number of air handling units were reduced by seven (7); the horsepower used in motors was reduced from 600 to 300 hp this included the motors from the air handling units but also for pumps and other systems equipment.
The air conditioning chiller (640 tons) was replaced with a 20 ton unit for the office area, 30 ton unit for the music areas and a 50 ton ice storage system for the main building. This ice was generated during the period of low demand and unit cost.
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