Abstract
The solution of the problem of the heat flux from the surface of collective finning at various temperatures of its ends is given. The obtained analytical formulas allow giving a quantitative estimate of the influence of the asymmetry of the boundary conditions on the heat transfer through the finned heat exchange surface. Calculated dependencies can be used in the design of high-efficiency heat exchangers for air conditioning, ventilation, and heating systems. The presented results can be especially useful under real operating conditions of heat exchange surfaces. This, in turn, ensures the safe and reliable operation of the building’s engineering systems as a whole.
Highlights
In heat exchangers, where heat transfer occurs between gas and liquid media, finned heat exchange surfaces are commonly used
Finning of heat-exchange surfaces allows significantly increasing the intensity of heat transfer, developing compact high-efficiency heat exchanging devices, which is especially important for air conditioning systems in which all the heat produced must be transferred to the atmosphere according to the conditions of their operation
Low values of coefficients of heat transfer from the cooling surface to air force to maximize the area of the heat exchange surfaces, which leads to an increase in weight, size and consumption of the metal of these heat exchangers
Summary
In heat exchangers, where heat transfer occurs between gas and liquid media, finned heat exchange surfaces are commonly used. Finning of heat-exchange surfaces allows significantly increasing the intensity of heat transfer, developing compact high-efficiency heat exchanging devices, which is especially important for air conditioning systems in which all the heat produced must be transferred to the atmosphere according to the conditions of their operation. The finned heat exchange surfaces are widely used in boiler technology, heat supply systems, ventilation units, air conditioning units. There are reliable design formulas for this case that allow carrying out design and verification calculations of heat exchangers operating in the given conditions or close to them [1-15]. These conditions are not always fulfilled, and sometimes they have a pronounced asymmetric character. An attempt to give a theoretical solution to this problem is made
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