Central HVAC Equipment
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Central HVAC equipment falls into many categories, including thermal storage and air-to-air energy recovery equipment. Following is a list of equipment broken down by Master Format heading.
Topic Summary
23 71 00 Thermal Storage
Includes Thermal Heat Storage and Chilled-Water Thermal Storage. Thermal Heat Storage includes Room Storage Heaters for Thermal Storage, Heat-Pump Boosters for Thermal Storage, Central Furnace Heat-Storage Units, and Pressurized- Water Thermal Storage Tanks. Chilled-Water Thermal Storage includes Ice Storage which includes Internal Ice-on-Coil Thermal Storage, External Ice-on-Coil Thermal Storage, Encapsulated-Ice Thermal Storage, Ice-Harvesting Thermal Storage, and Ice-Slurry Thermal Storage. These kinds of equipment are well suited for providing chilled water to central station air handlers in the following types of applications as suggested by Calmac.
23 72 00 Air-to-Air Energy Recovery Equipment
Includes Heat-Wheel Air-to-Air Energy-Recovery Equipment, Heat-Pipe Air-to-Air Energy-Recovery Equipment, Fixed-Plate Air-to-Air Energy-Recovery Equipment, and Packaged Air-to-Air Energy-Recovery Units. All heat recovery units include some kind of heat exchanger. The basic principle in heat recovery is expressed in the picture below.
23 73 00 Indoor Central-Station Air-Handling Units
Includes Modular Indoor Central-Station Air-Handling Units, Custom Indoor Central-Station Air-Handling Units, Indoor Indirect Fuel-Fired Heating and Ventilating Units which includes Indoor Indirect Oil-Fired Heating and Ventilating Units and Indoor Indirect Gas-Fired Heating and Ventilating Units, and Indoor, Direct Gas-Fired Heating and Ventilating Units. See an example schematic diagram of an Indoor Central-Station Air-Handling Unit below.
23 74 00 Packaged Outdoor HVAC Equipment
Includes Packaged, Outdoor, Central-Station Air-Handling Units, Packaged, Outdoor, Heating-Only Makeup-Air Units which include Packaged, Direct-Fired, Outdoor, Heating-Only Makeup-Air Units and Packaged, Indirect-Fired, Outdoor, Heating-Only Makeup-Air Units, and Packaged, Outdoor, Heating and Cooling Makeup Air-Conditioners. What are commonly referred to as roof-top units are included in this group. Sometimes the roof is not conducive to receive a unit, so most can be be installed on the ground with specially protected ductwork running to and from the building.
23 75 00 Custom-Packaged Outdoor HVAC Equipment
Includes Custom-Packaged, Outdoor, Central-Station Air-Handling Units, Custom-Packaged, Outdoor, Heating and Ventilating Makeup-Air Units, and Custom-Packaged, Outdoor, Heating and Cooling Makeup Air-Conditioners.
23 76 00 Evaporative Air-Cooling Equipment
Includes Direct Evaporative Air Coolers, Indirect Evaporative Air Coolers, and Combined Direct and Indirect Evaporative Air Coolers. The following picture is of an industrial sized Evaporative Air Cooler.
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