Résistance thermique Figure 1: Two Inch Double Wall Rlgld Polyurethane Foam lnsulatlon Compared to One Inch Fiberglass lnsulatlon This composite design results in improved operating costs, thermal resistance and breaks, air seals, rigidity, impact resistance, maintainability, indoor air quality, and equipment lifetime. The resulting closed cell foam core has a density of two pounds per cubic foot. After the casing is evacuated of all air, the polyurethane liquid is cured through a pressurized baking process. As the liquid foam fills the casing, trapped air escapes through designed openings. Low viscosity polyurethane liquid is injected into a galvanized steel casing with integrated thermal breaks. The manufacture of AAON Rigid Polyurethane Foam implements cutting edge technology. Polyurethane Foam Core Panel with Thermal Break Rigid Polyurethane Foam Panel Design This reduces the energy lost to the environment and reduces the building owner’s operating cost. The AAON Rigid Polyurethane Foam cabinet saves cooling and heating energy through improved insulation and air seals. The conventional fiberglass insulated cabinet creates a thermal bridge for heating and cooling energy between a building’s interior and the outside environment. The utilization of the AAON foam panel design has improved: One benefit of an AAON cabinet is a reduction in owner’s operating cost u to 22 % each year. By improving air tightness, the AAON cabinet reduces any load created from the outside air. The increased insulation of an AAON cabinet will reduce the undesired heating and cooling of the cabinet airstream due to the outside ambient temperature. Cabinet testing has shown the air infiltration rate is below 1.5% of total airflow at 1 inch of internal negative static water pressure. Ail AAON panels incorporate thermal breaks to separate the HVAC tunnel air temperature with the outside ambient air temperature. This would commonly be found on more costly custom equipment. This is equivalent to using panels with thermal breaks and four inches thick, 0.5 pounds per square foot fiberglass. The AAON two inches wall panel has a thermal resistance of R-13. By implementing a composite structure, the foam and sheet metal are combined into a cabinet with improved insulation and air seals. AAON manufactures a double wall Rigid Polyurethane Foam panel with thermal breaks for the HVAC cabinet’s air tunnel. Although air infiltration rates may vary between manufacturers, 4’k of total airflow at 1 inch of internal negative static water pressure can be used as a representative leakage rate.ĪAON uses a different approach. Due to the lack of published standards on the HVAC cabinet air leakage, air infiltration percentages are not available. The R value of a fiberglass panel is reduced even more without a thermal break between the HVAC tunnel air temperature and the outside ambient air temperature.
Thermal resistance values for fiberglass panels are typically less than R-2. An HVAC cabinet can become a pathway for heating and cooling energy to enter or escape from a building.Ĭonventional HVAC cabinets incorporate narrow one-half to one inch fiberglass insulation attached to a single wall of galvanized sheet metal. Like the building, the HVAC cabinet should have requirements for minimum insulation and air seals. Like the building, the Heating Ventilation and Air Conditioning (HVAC) cabinet can lose energy through poor insulation and air seals. Likewise, ASHRAE 90.1-2010 requires sealing, caulking, gasketing, or weather-stripping of various areas of the building envelope. For instance, the ASHRAE standard 90.1- 2010 requires all above deck insulation in climate zones 2 through 8 to have a minimum thermal insulating value of R-20 and climate zone 1 to have a minimum R-13. Architects, engineers, and owners know that utilizing quality materials and construction techniques will minimize losses in the building. Ventilateurs d’extraction centrifuges Carnesĭid you know that an AAON HVAC cabinet can help you save money? As utility costs increase, poor insulation and poor air seals will result in more wasted heating and cooling dollars.Air distribution : Grilles and diffuser.Terminal units and Variable air volume Box Carnes.Ventilation, climatisation et chauffage.Les humidificateurs à vapeur pressurisés.
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