RELIABLE AND SAFE ARRANGEMENT FOR REGULATION OF HEAT SUPPLY OF ELIABLE AND SAFE ARRANGEMENT FOR REGULATION OF HEAT SUPPLY OF RESIDENTIAL BUILDINGS

An elementary arrangement is considered for heat supply of residential buildings with dependent connection to external heating systems, providing reliable heat delivery and required comfort indoors due to admixing of water from the heating system return line at an outdoor temperature exceeding the breakpoint temperature. Basic equations are analyzed describing dependence of the temperature of water in the trunk lines on the outside air temperature, and an overview is presented of possible ways to regulate heat delivery and prevent oversupply of heat near the beginning and the end of the heating season with consideration of requirements of the current Russian Federation regulations. Calculations are performed, which enable to determine the desired admixing ratio in conditions of application of an arrangement with buildings connected to a heating system involving use of mixing pump based on linearization of the equation of the temperature curve in the heating system in a close proximity to the breakpoint temperature. Analysis is given of results obtained, and conclusions are drawn regarding the feasibility of the arrangement under consideration. It is found that the value of the current dimensionless diff erence of temperatures of indoor and outdoor air at the breakpoint does not depend on climatic parameters of the construction area, and the required admixing ratio is almost directly proportional to the excess of outdoor temperature compared to the breakpoint temperature. It is shown that the higher the estimated water temperature in the return line of the heat network at the breakpoint is, the higher the value of the admixing ratio. Recommendations are given on sharing the elevator and the mixing pump in order to minimize variations at reconstruction of the heat entry to eliminate oversupply of heat.

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