Air to Air Heat Exchangers for Air

Air-to-Air Heat Exchangers for Air Handling Units: Fundamentals and Types - AHUmag...Page 1 of 8 English Español HOME Português ARTICLES SEARCH... MARKETS CALCULATORS JOBS CONTACT US Air-to-Air Heat Exchangers for Air Handling Units: Fundamentals and Types By AHUmag | on March 18, 2015 | Africa Posts Articles Markets Asia Back to the School North America Oceania Europe Featured South America http://www.ahumagazine.com/air-to-air-heat-exchangers-for-air-handling-units-fundament... 7/22/2015 ahumagazine.. in more than 50%.AHUmag.Air-to-Air Heat Exchangers for Air Handling Units: Fundamentals and Types . http://www. TAGS The air-to-air heat exchangers can be used for heat and/or moisture recovery. pressure drop of the system (extra electrical consumption for the fans) and the characteristic efficiency of each model and size of heat exchangers. The average payback time for this kind of components. became essential to recover energy form the exhaust air in the Air Handling Units... depending of factors like the design air conditions (outdoor and indoor).com/air-to-air-heat-exchangers-for-air-handling-units-fundament. With the need to provide to the buildings large amounts of outdoor air (to comply with local legislations for air changes rates related with IAQ requirements). 7/22/2015 . that had previously been treated as fresh air (heated/cooled) in order to reach the indoor comfort setpoint temperature. Fundamentals adiabatic cooling adiabatic humidification AHR Expo AHRI The operating principle of air-to-air heat exchangers (or air-to-air heat recovery systems) consists of exchange temperature and/or humidity between the exhaust and supply airflows inside the Air Handling Units. typically is between less than 1 year and 2 years. This AHU Airedale air handling unit Camfil way the thermal energy contained in the exhaust air is recovered for the supply air and thus the load of energy required to certification program heat/cool/humidify/dehumidify the air is reduced. Among all types of heat recovery systems the most used in Air Handling Units are the air-to-air heat exchangers. Page 2 of 8 FOLLOW US ON: Air-to-Air Heat Exchangers for Air Handling Units: Fundamentals and Types Follow506 Follow @AHUmag Nowadays the Indoor Air Quality (IAQ) in buildings is a topic increasingly taken into account in the design of HVAC systems.. Using heat recovery systems it is possible to reduce the energy consumption used to heat or cool the fresh air. . or wheel.AHUmag. Data Center ebm-papst EC motor How to calculate the Sensible Heat Recovery Efficiency. 7/22/2015 .Air-to-Air Heat Exchangers for Air Handling Units: Fundamentals and Types . http://www. for different applications.. The wheel is driven by means of a motor and a belt. made from innovation Klimak Klingenburg less noise aluminium foils. outdoor and indoor temperatures and humidity.. Depending the coating applied to United Kingdom the wheel they can be used also to drying and humidification. Usually this kind of heat exchanger is not used in applications that demands zero contamination between the exhaust airflow and the supply airflow. that are able to recover temperature and/or humidity. rotating the wheel and transport the heat OJ Electronics project reference Plug Fan rating recovered in the half wheel from the exhaust airflow to the supply airflow. statistics Steam Humidifiers There are several types of rotors. education center Sensible Effectiveness (ASHRAE 84) and Sensible Temperature Ratio (EN308) EMI EN 1886 energy recovery eSDM Calculator Eurovent Types Eurovent Market Intelligence There are several types of air-to-air heat exchangers with mean recovery evaporative cooling efficiencies from 50% up to 90%. Page 3 of 8 Before the introduction of air-to-air heat exchangers in the AHUs (and the coils Conference HVAC systems) the exhaust conditioned air was simply discharged directly to the atmosphere.ahumagazine. The size of the rotors can go from small diameters size (domestic applications) to huge diameters for industrial applications (5 meters).. Wheels used to dry the air are also called as desiccant wheels.. Half of the rotor is in contact with the exhaust airflow while the other half contacts the supply airflow. depending the type of heat exchanger and the outdoor and indoor air conditions (temperatures and humidity).com/air-to-air-heat-exchangers-for-air-handling-units-fundament.. the efficiency claimed by manufacturers for a rotary heat rotary Sandometal sorption rotor standard exchanger can reach up to 90%. Exhibition filter Fans Filters From all types of air-to-air heat exchangers the most used in Air Handling Units applications are: filtration Fläkt Woods heat exchanger Rotary Heat Exchangers Heat Recovery The rotary heat exchangers is one of the most efficient air-to-air heat exchangers and are able to handle large airflows. If the right conditions are achieved. The core of this heat exchanger is the rotor. Click to zoom. Page 4 of 8 Air-to-Air Rotary Heat Exchanger for Air Handling Units. Click to zoom. http://www.AHUmag.Air-to-Air Heat Exchangers for Air Handling Units: Fundamentals and Types .com/air-to-air-heat-exchangers-for-air-handling-units-fundament.. This kind of solution offers high leak tightness which means that the percentage of leakage from the exhaust airflow to the supply airflow is near zero...ahumagazine.. 7/22/2015 . Air-to-Air Counter Flow Heat Exchanger for Air Handling Units. Plate Heat Exchangers The plate heat exchangers are the most used solution amoung the ait-to-air heat exchangers. There are two types of plate heat exchangers: Counter Flow Plate Heat Exchangers and Cross Flow Plate Heat Exchangers. the cross flow heat exchanger for the same conditions have lower efficiency. If comparing with the counter flow heat exchanger.. due to air http://www. As the name itself suggests the design of the cross flow plate heat exchanger forces the exhaust airflow and the supply airflow to crosses between them. indoor and outdoor.0% leak between the two airflows. The heat recovered in the exhaust coil is transferred by the circulating water to the supply coil that will then transfer that heat to the supply airflow. among all the other accessories as expansion vessel.. This lower efficiency. have a percentage of glycol for anti-freeze protection.com/air-to-air-heat-exchangers-for-air-handling-units-fundament. Typically this system is composed by two water coils. so for industrial applications the pressure loss and the heavy contamination of the air will play an important role to choose the cross flow heat exchanger as the preferred option. is compensate with the possibility to work with a wider range of airflows (due to his structural design can be larger in size.AHUmag.Air-to-Air Heat Exchangers for Air Handling Units: Fundamentals and Types . Run Around Coils Such as the heat recovery systems detailed in the previously points. of the cross flow heat exchanger. due to modular construction). Click to zoom.. In the case of counter flow heat exchangers with the right conditions. Opposite airflows can maximize the heat energy exchange. The standard material used to produce the plates is aluminium. This system usually is used in installations where the exhaust airflow and the supply airflow are split (one supply AHU and one exhaust AHU) or if there is a demand of 0. controls. The water. but they can also be manufactured in plastic and aluminium with epoxy coating for special application. Moreover the cross flow heat exchanger offer more options of spacing between the plates than the counter flow heat exchanger. where the exhaust airflow and the supply airflow have a opposite path (counter). 7/22/2015 . most of the times. connected each other by pipework and a pump that circulates the water from one coil to the other. Page 5 of 8 Air-to-Air Cross Flow Heat Exchanger for Air Handling Units.ahumagazine. This value can reach to around 70% for the cross flow heat exchangers.. for example processes with high temperatures or corrosive atmospheres like swimming pools. the Run Around Coils recover the heat from the exhaust airflow and transfer it to the supply airflow. etc. manufacturers claim 85%-90% efficiency. The vapor when reach the part in the cold airflow of the tubes will condensate and return to the warm airstram part again by gravity. as two coils conected by the pipework. and that vapor moves to the cooler section of the heat pipes system.. Page 6 of 8 contamination issues. 7/22/2015 . In this system there is no need of any energy input. When instaled in the vertical configuration (double-deck) this system only work perfectly in one of the seasons (Winter or Summer).ahumagazine.. The exhaust warm air makes the gas inside the tubes to evaporate. Heat Pipes Typically this system is composed by one large coil. The run around coils only recover sensible temperature. Click to zoom. http://www.AHUmag. The average efficiencies claimed by manufacturers for this systems are up to 75%. In this kind of system the usual heat recovery efficiencies claimed by manufacturers can go up to 60% (up to 75% in high efficiency option).com/air-to-air-heat-exchangers-for-air-handling-units-fundament. The tubes of the coil are sealed and charged with a refrigerant (one of the most used is the R134a).Air-to-Air Heat Exchangers for Air Handling Units: Fundamentals and Types . as well as in the plate heat exchangers.. depending if the exhaust airflow will be located in the upper deck or in the bottom deck.. commun to the exhaust and the supply airflows with a division between the two airflows. Air-to-Air Run Around Coils Heat Exchanger for Air Handling Units. Air-to-Air Heat Exchangers for Air Handling Units: Fundamentals and Types .0 Comment SPC Heat Pipes for Air Handling Units Heat Recovery and Dehumidification How to calculate the Sound Pressure from the Sound Power January 29. Page 7 of 8 Air-to-Air Heat Pipes Heat Exchanger for Air Handling Units. 2015 ...0 Comment February 19. 2015 .AHUmag. 2015 .com/air-to-air-heat-exchangers-for-air-handling-units-fundament..ahumagazine. 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