On pulsing heating of the heat transfer medium in thermal delivery systems

Abstract

The questions connected with the influence of pulsed heating of the coolant on the operating efficiency and the parameters of the heat supply systems are considered. When implementing such a method in the heating systems of private residential buildings (houses) «hot water boiler – heat exchangers – living quarters», where the working body (heat carrier) is water, it is necessary, along with maintaining comfortable conditions inside the premises, to create an efficient operating mode with minimizing fuel consumption, which may possibly be mutually exclusive influencing factors. In addition, the theoretical justification of the efficiency of using pulsed heating of heating medium in heating systems of residential buildings is extremely limited in the technical literature, which served to formulate the purpose of this work. To achieve it, a mathematical model of the thermal performance of the individual heating system of the building with pulsed heating of the coolant has been developed. Based on the analysis of the heat carrier heating dynamics equation, the main parameters of impulse heating of a heat supply system of a building are determined, the rational values for the duration of the heat input and the pause between the pulses, and the duty cycle of the pulses, depending on the heating surface of the heating devices in the buildings and the thermal losses to the environment. The essential influence of these functional parameters on the characteristics of the impulse heat supply and the heat carrier heating intensity has been shown. The ranges of the change in the pulse frequency have been determined, within which the pulse mode of heat supply in heating systems can be more effective. The concept has been introduced, by analogy with the regular mode of heating (cooling), the rate of heating (cooling) of the coolant – the rate of change in its temperature