Description: Energy recovery unit (ERU) is a rotary or plate type counter flow air-to-air exchanger designed to provide maximum energy efficiency in ventilated systems where heated or cooled air is exhausted and outdoor air is introduced as makeup. In applications where ventilation is required, energy wheels are used to reduce the initial investment in HVAC equipment and to minimise operating costs. Since HVAC equipment is typically the largest single source of energy consumption in commercial buildings, ERU investments are economically justified on most new retrofit HVAC systems with 15% or more outdoor air-makeup. In new HVAC installations, ECUs also allow ventilated systems to be sized with smaller compressors, condensers, and other DX components, lowering the initial cost of the HVAC package. Plate heat exchanger is designed for normal ventilation and is a cross-flow heat exchanger built from aluminium or epoxy coated aluminium plates. Two neighbouring plates form a channel either for supply or exhaust air. The supply air passes on one side of the plates and the exhaust on the other side. The heat is transferred through the plates from the warmer air stream to the colder air stream. It has a laminar flow and minimises the risk for fouling and clogging. Regarding features it improves indoor air quality; transfers sensible and latent energy; lowers capital equipment cost; provides huge energy savings as well as reduces operational costs.
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