MINIMIZING HEAT LOSSES IN HEATING NETWORKS BY OPTIMIZING THE LOCATION OF THE WATERSHED NODE
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Abstract
The paper proposes an energy-efficient approach to reducing heat losses in conditionally closed urban heat supply networks by optimizing the location of the watershed node without capital investments in pipeline reconstruction.
Subject. The problem of the suboptimal location of the watershed node in conditionally closed heating networks is investigated, which is often determined without taking into account heat losses during design. The relationship between the location of the watershed node, the amount of heat loss (through thermal insulation and with coolant leaks) and the hydraulic mode of the network with two-way power supply is analyzed.
Materials and methods. A methodology has been developed to find the optimal location of the watershed node based on minimizing the above costs, where heat losses are the main variable. The method includes: drawing up a differential equation for an infinitesimal section of pipeline, taking into account the distributed flow of coolant; forming a condition for minimal heat losses while maintaining a balance of hydraulic losses in both network lines (taking into account the coefficient of local resistance z = 0.01).
Results. Using the example of the heating network of the village of Novoe Goryanovo, Ivanovo region (lengths of sections up to the watershed: L₁ = 390 m, L₂ = 362 m; distributed costs: g₀₁ = 0.113 kg/(s*m), g₀₂ = 0.138 kg/(s*m·) It is shown that the transfer of the watershed node to building No. 14 (distance Lₓ = 24.31 m from the starting point) reduces heat losses by 2.12% (from 25.10 to 24.57 kW); the change in hydraulic mode is insignificant: the pressure loss discrepancy is 4.17%, which does not violate the hydraulic stability of the system.;
Conclusions. Optimizing the location of the watershed node is an effective tool for improving the energy efficiency of existing heating networks without capital costs. The proposed technique makes it possible to achieve a reduction in heat losses with minimal impact on the hydraulic regime, which is confirmed by practical calculation on a real object. The approach is applicable for the reconstruction and operation of conditionally closed heat supply systems in order to save energy resources and increase reliability.
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References
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