Effect of supply and exhaust air velocity on the enthalpy and temperature exchange efficiency of a paper heat exchanger

The effect of the supply and exhaust air velocity on the enthalpy and temperature exchange efficiency of a paper heat exchanger is investigated. Two paper heat exchangers were tested inside an HRV installed in an air-conditioned room. The HRV fan speed was varied and the air velocity was measured.

Heat exchangers are commonly used in many kinds of industries the heating, ventilation, and air-conditioning (HVAC) industry, automotive industry, and power plant. In this research paper, the emphasis is put on paper heat exchangers. This research is mainly collecting data for the effect of supply and exhaust air velocity on the enthalpy and thermal exchange efficiency of a paper heat exchanger. Data will be collected by doing experiments in collaboration with Daikin R&D Malaysia (DRDM), as well as by CFD simulations. The focus will be put on a specific type of heat exchanger, which is the paper heat exchanger, that is mostly used in Heat Recovery Ventilators (HRV) or Energy Recovery Ventilators (ERV). The term Paper Heat Exchanger refers to a thin plate-like material that allows fluids to pass through, and these commonly exist in HRVs and act as filters, while allowing heat transfer between outdoor and indoor air. HRVs are commonly installed in buildings where air-conditioning is used, and HRVs are known to be able to reduce load and save energy costs. HRVs are able to extract waste heat energy from building exhaust air while providing fresh ventilation and saves energy on heating and cooling load costs. In the modern era, enclosed or ‘air-tight’ offices are rather common and many people that are working in enclosed offices have high chances of being diagnosed with “tight-building syndrome” due to the poor Indoor Air Quality. Hence, Indoor Air Quality plays an important role that would tremendously affect the human’s health. Ventilators are important in large buildings, and the implementation of HRVs helps with driving out the stale air from a building and replacing it with fresh and cool air from the outdoors without any heating or cooling element.

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