by exchanging sensible heat and water vapor (latent heat) with the exhaust air (EA) stream (Figure 1). In this case, the core is made of aluminum or plastic plates. Fill for total heat recovery is made from a number of different materials and treated with a hygroscopic material such as lithium chloride, alumina, or aluminum oxide, each of which has specific moisture pickup properties. The word enthalpy means heat content or total heat . Also the enthalpy wheel heat precools the air before it reaches the cooling coil, increasing the latent capacity and possibly lowering the system cooling energy use. Nearly half of global energy is used in buildings,[2] and half of heating/cooling cost is caused by ventilation when it is done by the "open window" method according to the regulations [define method and include citation]. An enthalpy wheel used between the warm air entering the cooling coil and the cool air leaving the coil transfers sensible heat to the cold exiting air, thereby reducing or even eliminating the reheat needs. Titan Air has taken the high thermal efficiency of direct fired equipment to the next level by incorporating an enthalpy wheel to precondition outdoor air transferring both latent and sensible energy. Because both temperature and moisture are transferred, ERVs are described as total enthalpic devices. When using rotary energy recovery devices the two air streams must be adjacent to one another to allow for the local transfer of energy. For example, a 1°F dry bulb drop in air entering a cooling coil can increase the latent capacity by about 3%. Heat wheels have a relatively low air pressure drop, typically 0.4 to 0.7 in. Polymer fixed-plate countercurrent energy recovery ventilators were introduced in 1998 by Building Performance Equipment (BPE), a residential, commercial, and industrial air-to-air energy recovery manufacturer. “Sustainable Building Sourcebook.” City of Austin’s Green Building Program. heat exchanger is a sensible heat wheel. An enthalpy wheel used between the warm air entering the cooling coil and the cool air leaving the coil transfers sensible heat to the cold exiting air, thereby reducing or even eliminating the reheat needs. Enthalpy wheel — A common term used to describe all rotating, wheel-shaped devices that transfer sensible (temperature) and latent (water vapor) energy from one air stream to another . The right set of wheels depends on vehicle characteristics and desired ride quality. UCSD-ENG-089. The enthalpy exchange is accomplished through the use of desiccants. Enthalpy plates were introduced in 2006 by Paul, a special company for ventilation systems for passive houses. These heat exchangers can be both introduced as a retrofit for increased energy savings and fresh air as well as an alternative to new construction. Carry-over can be further reduced by adding a purge section to the wheel where some supply air is bypassed through a section of the fill before the main supply passes through the wheel. [5], The Home Ventilating Institute (HVI) has developed a standard test for any and all units manufactured within the United States. [4], The efficiency of an ERV system is the ratio of energy transferred between the two air streams compared with the total energy transported through the heat exchanger. The other is to control the rotating speed of the wheel with a variable speed drive. It is entirely constructed with aluminum, the desiccant-coated aluminum filter supported with large spokes in thermal wheel. Regardless, not all have been tested. Low air pressure drop and larger footprints cases a matrix core material is to! 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