Abstract
This paper deals with study of the pressure losses of the new heat convectors product line. For all devices connected to the heating circuit of the building, it's required to declare a tabulated values of pressure drops. The heat exchangers are manufactured in a lot of different dimensions and atypical shapes. An individual assessment of the pressure losses for each type is very time consuming. Therefore based on the resulting data of the experiments and numerical models, an electronic database was created that can be used for calculating the total values of the pressure losses in the optionally assembled exchanger. The measurements are standardly performed by the manufacturer Licon heat hydrodynamic laboratory and the numerical models are carried out in COMSOL Multiphysics. Different variations of the convectors geometry cause non-linear process of energy losses, which is proportionately about 30% larger for the smaller exchanger than for the larger types. The results of the experiments and the numerical simulations were in a very good conjuncture. Considerable influence of the water temperature onto the total size of incurred energy losses has been proven. This is mainly caused by the different ranges of the Reynolds number depending on the viscosity of the used liquid. Concerning to the tested method of superposition, it is not possible to easily find the characteristic values appropriate for the each individual components of the heat exchanger. Every of the components behaves differently, depend on the complexity of the exchanger. However, the correction coefficient, depended on the matrix of the exchanger, that is suitable for the entire range of the developed product line has been found.
Highlights
At the work, that presented [4] was searching for the energy balance between the heat comfort and overall energy supplied to the room
A heat exchanger designed for one primary circuit was used, which has been studied for usability of the finite element (FEM) and superposition methods for detecting the pressure losses in the convector [1]
For the whole range of convector models, an assessment of the most appropriate methods for the determination the pressure losses that are arising during the flow of the heating medium through the heat exchanger are required
Summary
That presented [4] was searching for the energy balance between the heat comfort and overall energy supplied to the room. The results showed that in energy terms, it is more advantageous that natural convection should be caused by the movement of warm air after heating naturally. Such a solution appears to be preferable, especially in terms of material savings. For a system with two separate circuits, more tubes are required than for the heating system. This compromise is due to logically considering the relatively small temperature gradient generated during cooling (medium temperature recommended approximately ~ 9°) compared with the gradient achieved by heating the heat exchanger in the room air at significantly higher values. A heat exchanger designed for one primary circuit was used, which has been studied for usability of the FEM and superposition methods for detecting the pressure losses in the convector [1]
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