Heat exchange area calculation
Thread Content
Using an external steam pipe with a diameter of 273 and a pressure of 3.2 Mpa, to heat 3 cubic meters of heat transfer oil from room temperature to 200°, what is the heat exchange area required? How to calculate
There are too few conditions; I guess it’s impossible to calculate anything
Heat generated by a 3-cubic-foot increase in temperature of heat transfer oil: mass of the heat transfer oil multiplied by heat capacity multiplied by temperature difference. The formula for calculating the heat exchange area is shown in the figure. The temperature of the steam after condensation is assumed, and the logarithmic temperature difference is calculated to determine the heat exchange area. The weight of the steam is then calculated using the steam specific enthalpy table
This post was last edited by wanlirn on 2019-12-22 09:43. For heat transfer oil, it’s useful to give an approximate time required to reach the operating temperature; otherwise, estimating it isn’t very meaningful. For example, as long as the steam temperature is higher than that of the heat transfer oil, it’s fine to use 1 square meter of heat exchange area for 8 hours, or to use 100 square meters of heat exchange area for half an hour
I can estimate it – just 1 square meter will do, no matter how long it takes to heat up
What does 3 cubic mean? If there’s no flow rate, isn’t that just being unreasonable when it comes to heat exchangers?