Abstract
The aspects of the functioning of centralized heating systems of residential urban districts after additional insulation of this district existing buildings were considered. The influence of the heat carrier temperature in the district distribution heating network on the heat transfer surface of the heat exchangers that are installed in the individual heat station schemes with independent connection between buildings heating systems and heat networks was analyzed. Estimates were made for a plate heat exchanger with a counterflow pattern of heat carriers that are widely used in heat supply systems. Formulas have been obtained for calculating the heat exchange surface of the district water heater comparing to the surface of the "basic" design case of the heat exchanger, taking into account the district water temperature excess over the building heating water temperature. When finding the heat transfer coefficients in the channels of heat exchangers, known criterion equations for plate heat exchangers were used. The proposed formulas take into account the influence of the ratio of heat equivalents of the carriers flow rate through the heat exchanger and the decrease in heat consumption for heating as a result of building insulation. Buildings that were designed and built in accordance with the requirements for thermal resistance of enclosing structures that were actual several decades ago, after thermal modernization, should meet modern requirements for the thermal resistance of building structures. All estimates of the reduction in the buildings heating load were made in accordance with this approach. An analysis of the obtained results made it possible to propose some recommendations for the selection of district water calculated temperature differences at which a decrease in the heat transfer surface of the plate heat exchanger of the insulated buildings individual heat station can be expected. The proposed recommendations can be useful in developing a heat supply quality control schedule for a district buildings heating systems in a district when buildings thermal insulation process being completed.
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