Application of Physical Similarity in the Transfer of Results from a Model to a Prototype
Abstract
The process of heat distribution through heat networks is accompanied with significant loss. That is why distributors of heat and hot water are nowadays very interested in these issues. The drawbacks of the existing methods of heal loss calculation brought the necessity of searching new procedures of such calculation.
The article presents a possibility of using the similarity theory and modelling in order to transpose results from an experimental heat network to any other network that will be similar to the experimental network with regard geometry, kinematics, as well as heat parameters.
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Introduction
The heat loss is identified using the so-called balance method in which it is necessary to know the temperature of a heatconveying material in the beginning and at the end of the examined section, with sufficient accuracy, and the water flow rate in the supply as well as return pipelines. The measurements of the temperature differential for the heat-conveying material in short sections require the use of the state-of-the-art measuring technology which, however, cannot be permanently installed in every network, especially when the entire distribution system covers several tens of kilometres. Such methodology for the heat loss identification is appropriate mainly for very long heat distribution sections in which an error in the measurement of the temperature differential would not cause a substantial error in the subsequent calculation of the heat loss.
Conclusion
In conclusion, it is necessary to note that identification of heat losses through the examination of a physical model will find its practical applications. Introducing this procedure into real practice would not result in increased costs insured to heat manufacturers or distributors; moreover, it would facilitate clear identification of the values of total or specific heat loss in the network.