The problem was solved based on a system of one-dimensional (cross-section averaged) energy equations for two heat carriers and the heat conduction equation for the wall. The wall ends were assumed to be heat i
For the winter period the problem is solved easily by assuming dry heat transfer and using the graphical representations of Kays and London1 and Schedwill2, or the equation given by Schedwill2 for reading or calculating the heat exchanger effectiveness, e d, as a function of the number of ...
This section discusses recommendations to address the limitations presented above and to propose a solution for application in PEMFC membrane heat and humidity exchangers. Firstly, the Clausius–Clapeyron equation, Eq. (12), can be left as is. However, the enthalpy of vaporization and reference stat...
The automatically determining is based, at least in part, on weighted cooling effectiveness of the components of the cooling system, and the determining operates to limit power consumption of at least the cooling system, while ensuring that a target temperature associated with at least one of the...
For this purpose a new model with a water film that flows down, corresponding to the real conditions in these heat exchangers, is developed. The method of Maclaine-cross and Banks is improved by an approach to determine the mean water surface temperature and by derivation of an equation for ...
The proposed model is a gray model that uses mathematical equations that are deducted from the effectiveness and number of the transfer unit of the heat exchanger and a regression equation for the ratio of humidity capacities (X factor) analogous to the heat capacities ratio of heat exchangers. ...
The flow and heat transfer inside the servers and heat exchangers are modeled using physics based approaches that result in differential equation based math-ematical descriptions. These models are programmed in the MATLAB language and embedded within a CFD computational environment (using the commercial...
The water block works as a sensible heat exchanger between the water and the TEM surface at constant temperature. Teflon insulation was inserted between two water blocks to minimize the heat conduction from the hot side to the cold side of the TEM. Figure 1. Thermoelectric heat pump test ...
[65]. The differences between the inlet and outlet temperature of the night sky radiation heat exchanger resulted in a drop of 6.8 °C. Along this line, Paker et al. [66] introduced the innovative “NightCool” roof concept designed to cool residential buildings. This approach involves ...
For a limiting case, two analytical solutions are also obtained with different assumptions. Based on the results of the numerical study and the experiments carried out using a laboratory-made rotary-type heat exchanger, an empirical equation that can be used even for very small rotational speeds ...