Thursday, December 11, 2014
Thursday, July 10, 2014
Plate Heat Exchanger
A plate heat exchanger is a type of heat exchanger that uses metal plates to transfer heat between two fluids. This has a major advantage over a conventional heat exchanger in that the fluids are exposed to a much larger surface area because the fluids spread out over the plates. This facilitates the transfer of heat, and greatly increases the speed of the temperature change. Plate heat exchangers are now common and very smallbrazed versions are used in the hot-water sections of millions of combination boilers. The high heat transfer efficiency for such a small physical size has increased the domestic hot water (DHW) flowrate of combination boilers. The small plate heat exchanger has made a great impact in domestic heating and hot-water. Larger commercial versions use gaskets between the plates, smaller version tend to be brazed.
Thursday, June 26, 2014
Fundamentals of Heat Exchanger Theory and Design
Heat exchanger theory leads to the heat exchanger design
equation that relates the overall heat transfer coefficient, heat transfer surface area, and log mean temperature difference to the rate of heat transfer. This heat exchanger design equation is used to find the area needed for heat exchangers.
Introduction
The heat exchanger design equation can be used to calculate the required heat transfer surface area for a variety of specified fluids, inlet and outlet temperatures and types and configurations of heat exchangers, including counterflow or parallel flow. A value
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