Turbulently flowing media and boiling/condensing fluids are very agitated, and will therefore transport energy mostly by convection. Convection – Movements of the fluid itself also transport energy.The conductivity varies with the physical properties of the medium. In the stainless steel walls of a heat exchanger and in laminar flow (slow moving) regions, heat is transported only by conduction. Conduction – The heat is conducted through solid material or a stationary liquid.Heat transfer coefficient (k)Įnergy may be transported from a hot fluid to a colder fluid in three ways: Hence, increasing the surface area implies higher costs. For BPHEs, a larger area can be achieved by increasing the size and/or number of plates, which means more stainless steel and copper brazing. Increasing the area of a heat exchanger implies that more energy can be transferred. This relation is described in the heat transfer equation (eq. In addition to the size of the heat transfer area, the amount of energy transported also depends on the heat transfer coefficient and the temperature difference between the two sides. The energy flow goes from the warm medium to the cold medium through the heat transfer area of the BPHE.
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