A HVAC pipe network circulation pumping system and its power-saving operation method

Abstract

The invention belongs to the technical field of heating, ventilating and air-conditioning, and in particular relates to a circulating pumping system of HVAC pipe network and its power-saving operation method. The circulating pumping system is composed of a circulating pump, an electric ball valve and a power-saving controller. It is used to collect the necessary operating signals of the circulating pump and output the frequency control signal of the circulating pump; the energy-saving operation method of the circulating pump is embedded in the energy-saving controller, which can realize the constant frequency, constant pressure difference and constant constant frequency of the circulating pump according to the needs of the HVAC system. The temperature difference and constant flow operation not only realize the power saving of the circulating pump, but also can expand multiple pumps so that multiple pumps can be used together. Run in the most power-efficient way.

Description

technical field [0001] The invention belongs to the technical field of heating, ventilating and air-conditioning, and in particular relates to a circulating water pumping system of a pipe network of heating, ventilating and air-conditioning and a power-saving operation method thereof. Background technique [0002] At present, in the HVAC pipe network, the resistance of the inlet and outlet pipes of the circulating pump is in a considerable proportion to the resistance of the check valve. If the circulating pump runs for a long time, a lot of electric energy will be wasted. Very wasteful of power. [0003] The current heating units are often equipped with circulating pumps in the form of one for use and one for standby. One pump is commonly used and the other is used as a backup. The two pumps operate alternately and serve as backups for each other. The inlet and outlet pipelines are designed according to one pump, and its resistance is the design resistance, generally betwe...

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Problems solved by technology

[0002] At present, in the HVAC pipe network, the resistance of the inlet and outlet pipes of the circulating pump is in a considerable proportion to the resistance of the check valve. If the circulating pump runs for a long time, a lot of electric energy will be wasted. very wasteful of electricity

[0003] The current heating units are often equipped with circulating pumps in the form of one for use and one for standby. One pump is commonly used and the other is used as a backup. The two pumps operate alternately and serve as backups for each other. The inlet and outlet pipelines are designed according to one pump, and its resistance is the design resistance, generally between 2 and 5m; if two pumps are used to replace one pump, that is, the spare pump is also used. In this way, the resistance of the inlet and outlet pipes of the circulating pump can be greatly reduced. The principle is that when the double pump replaces the single pump, each pump only shares half of the flow, and if the flow is reduced to 1 / 2, the resistance is reduced to 1 / 4; When a single pump is running, two pumps need to run at the same frequency, and without a check valve, it is easy to cause hydraulic instability of the two pumps, resulting in the collapse of the parallel operation condition

[0004] One-to-many technology is to use one frequency converter to drive multiple water pumps, including water pumps with power frequency operation and frequency conversion water pumps driven by frequency converters. Practice has proved that this operation mode is not energy-saving, because the outlet water pressure of frequency conversion water pumps is low. For power frequency water pumps, the working range of variable frequency water pumps becomes smaller, and it does not save electricity

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