District air-conditioner distributed secondary pump system

Abstract

The invention aims to provide a district air-conditioner distributed secondary pump system, which comprises refrigeration main engines 1, chilled water primary pumps 2, a water segregator 3, a water collector 4, and a profit and loss tube 5. According to the invention, in the two forms of an indirect connection 1 and an indirect connection 2, a chilled water secondary pumps 6, plate heat exchangers 7, user chilled water circulating pumps 8, and user tail end air processing devices 9 are mainly arranged on a user side; in the direct connection form, the chilled water secondary pumps 6, the user tail end air processing devices 9, and a bypass pipe 10 of a secondary pump suction inlet with a control valve are mainly arranged in the user side. The invention also provides a connecting form of distributively arranging the secondary pumps to a chilled water distribution system of each user building, and a corresponding operation control method. The system can well realize the hydraulic equilibrium of each paralleled loop circuit of a district cooling system transmission and distribution network, improves the operation efficiency of the secondary pumps, and greatly reduces the water pump energy consumption, thereby improving the energy efficiency ratio of the overall system, and increasing the safety of the overall district cooling system.

Description

technical field [0001] The invention relates to a district cooling and air-conditioning system, in particular to a district cooling and air-conditioning system in which variable-frequency secondary pumps are dispersedly arranged in each user's building to greatly improve the energy saving and safety of the system. Background technique [0002] At present, my country is in a period of industrialization that consumes a large amount of natural resources and raw materials to support rapid economic growth, and the contradiction between supply and demand of energy is becoming increasingly acute. According to the report "China Energy Comprehensive Development Strategy and Policy Research" completed by the Development Research Center of the State Council, my country's current energy efficiency is only 33.4%, which is 10 percentage points lower than the international level. are much higher than international standards. According to research by the Department of Science and Technology...

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Problems solved by technology

The resistance of each water loop in the design sometimes varies greatly. The conventional method for selecting the pump head is to determine the pump head by the resistance of the most unfavorable loop, although the flow on this loop may only be a small part of the total flow of the system. It is also necessary to choose a large-lift pump, and other loops have to rely on resistance elements such as balance valves or regulating valves to balance, resulting in high energy consumption in the water system

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