Experimental Research of the Exergy Efficiency of Water Heat Networks and Heating Systems
Journal Title: Вентиляція, освітлення та теплогазопостачання - Year 2019, Vol 28, Issue
Abstract
A study of the exergy efficiency and a procedure for calculating the exergy efficiency has been carried out, depending on the conditions of operation of the heat supply networks and the temperature of the outside air, based on the definitions of the exergy characteristics ε of the useful heat and аnergy a - the irreversibly lost heat in the environment. The calculation formula for determining the exergy efficiency coefficient ηε for heat supply networks is obtained. Exergy efficiency calculations for different options of thermal load regulation are executed. The results of calculations of exergy efficiency coefficient ηε of heat supply networks are shown. It is determined that when adjusting the modes of heat supply for "high" temperature charts, the value of the exergy efficiency decreases in comparison with the "heating" charts and is in the range of 0,90...0,941. Also, an estimation of exergy efficiency of heating systems in residential buildings under the control regimes for "heating" and "elevated" chart has been performed. We obtain the dependence for definition of calculations heating systems. The exergy efficiency of heating systems, which is 1.2...1.8 % higher than the exergy efficiency of the heat supply networks, are determined. The exergy coefficients of the usefulness of the heating systems are higher, with the same parameter for heat supply networks. This is due to the fact that the heating system does not take into account the energy of irreversible heat losses from the supply pipeline. It is proved that with the decrease of the temperature of external air the value of exergy efficiency also decreases. It is recommended to use "heating" control schedules for heat supply networks at an average annual heating temperature, which is in the interval from 1.0 °С to 2.0 °С) for heat supply networks.
Authors and Affiliations
V. Denhub
Keywords
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- EP ID EP605865
- DOI 10.32347/2409-2606.2019.28.53-58
- Views 82
- Downloads 0
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