Construction and dimension The Recair Sensitive can be used for air temperatures between -22 and +122 °F. The recuperator is constructed completely from polystyrene, from the foils to the casing. Only solvent-free elastic adhesives are used. The Recair Sensitive RS 300 has a width of 9.1” and a length of 18.9”, the height can vary from 5.9” to 19.7” (see Fig 2). It is also possible for several recuperators to operate in parallel. The largest recuperator (19.7 inches) weighs ± 11 lbs and has a heat exchange surface of ± 366 ft2 and a volume of 12 gallons. Figure 2: Dimensions. 60° Efficient performance The effectiveness and pressure drop as a function of the airflow is illustrated in Fig. 3/4 (Note: this diagram is based on a dry return air temperature of 68 °F and a mass balance). These values have been confirmed in tests by the Eindhoven University of Technology as well as the Netherlands Organization for Applied Scientific Research TNO. Please note that there is no direct linear relationship between the supply-air temperature and the outside-air temperature when it comes to effectiveness: In fact, effectiveness will increase even further under conditions of high indoor relative humidity, with a potential of reaching up to 98% thermal effectiveness (see Fig. 5). At extreme condensation, the pressure drop in the return air may double. The overall result is a very small difference in temperature between the supply and return air, leading to greater indoor comfort and lower basic energy requirements. Reduced freezing length 18.1” length 13.1” length 18.9” 0.3” When outside air temperatures are very low, freezing may occur at the end of a recuperator’s return-air duct if the temperature of the exhaust air drops below 32 °F. In the Recair Sensitive, the condensation heat of the moisture in the return air helps keep the exhaust air above the freezing point, even when the outside air is much colder (see Fig. 6). The annual number of hours that the recuperator will freeze is therefore much lower than the actual number of hours of outdoor freezing temperatures. Manufacturers can also reduce the number of freezing hours even further by adjusting air intake, mass balance and recirculation. 4 height 5.9” - 19.7” width 9.1” Pagina 3
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