AUTOMATIC REGULATION OF HEAT FLOW IN HEATING NETWORK FOR DUAL-FLOW HEATING SYSTEM

FIELD: heating systems. ^ SUBSTANCE: technique for automatic regulation of flow of heat in a heating system for a dual-flow heating system is based on provision of an optimum mode for the heating system through maintaining given ratios of pressure and temperature in direct and reverse network of pipes consisting of first contour with a heat source, main-line pump with output to a heat exchanger, which is connected to the second contour of the heating network with a circulator pump, and heating system with regulated parameters. The parameters are regulated using regulators in the network pipes directly in the stream of the heat carrier. Signals from the pressure and temperature sensors are passed on to microcontroller processors, and then to a computer for processing and storage. Change in the flow of the heat carrier and its regulation is achieved through pumping units with frequency converters, when signals are applied to the microprocessor, from pressure sensors at the pump input and output, as well as from sensors for active power expended by the motor of the pump. Heat input is calculated in the computer using a formula. There is programmed control of the heat input from the source and the resultant pressure in accordance with the program in the microprocessor controller of the first contour, with consideration of ambient temperature and losses in the network. Regulation of flow is done by a frequency converter through changing the frequency of rotation of the pump shaft. Heat from the first contour of the heating network reaches the heat exchanger on a given program, where it is passed to the second contour of the network. Using a circulator pump and a feed regulator, the given ratios of the pressure and temperature in the direct and reverse network pipes, are maintained. In this case the network operates in an optimum mode. The heat quantity from the source G"hs" is equal to the quantity of heat released by the consumer G"co" with nominal losses DeltaG"nl" in the network. If it is not possible to maintain the given drop in temperature in the direct and reverse pipelines of the second contour of the heating network, a command is passed to the main-line pump of the first contour, which lowers the flow until the given ratio between pressure and temperature in the direct and reverse pipelines appears in the second contour. If necessary, the main-line pump of the first contour is shut down for a defined time when the given ratio between pressure and tempe