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Air source heat pump variable return difference water temperature control method and system based on supply and demand matching

A water temperature control method and air source heat pump technology, applied in heating systems, heating methods, household heating, etc., can solve the problem of frequent start and stop, limited improvement effect, lower set value, etc., to improve the problem of frequent start and stop , reduce the impact of noise, prolong the effect of life

Active Publication Date: 2021-09-21
佰沃思(北京)教育科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing research focuses more on the optimization of the water temperature setting value. Based on the fixed control hysteresis of 4-5K, the setting value can be reduced through algorithms such as climate compensation under low load conditions, which can improve the performance of the unit to a certain extent. The improvement effect of the problem is limited

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  • Air source heat pump variable return difference water temperature control method and system based on supply and demand matching
  • Air source heat pump variable return difference water temperature control method and system based on supply and demand matching
  • Air source heat pump variable return difference water temperature control method and system based on supply and demand matching

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Embodiment 1

[0038] This embodiment discloses a water temperature control method and system based on supply and demand matching of an air source heat pump with variable return difference, including the following steps:

[0039] S1 Establish the building model based on the finite difference method according to the thermal design and air tightness of the building;

[0040] S2 According to the actual measurement data of the air source heat pump running one by one, the unit model is established based on the BP neural network algorithm including state identification parameters;

[0041] S3 establishes the terminal model considering the dynamic thermal process and the transmission and distribution model considering the inertia of the waterway;

[0042] S4 forms the dynamic model of the air source heat pump system based on the dynamic coupling relationship between the heating capacity of the unit, the heat supply at the end and the heat dissipation of the building;

[0043] S5 is based on the es...

Embodiment 2

[0047] This embodiment discloses the unit model, including unit power solution networks BP-P1 and BP-P2 in the start-up period and stable period, and unit heating capacity solution networks BP-Q1 and BP-Q2 in the start-up period and stable period.

[0048] In the unit model of this embodiment, the state identification parameter i is introduced into the source data obtained from the test P i Q , corresponding to the gradual change of unit power and heating capacity during the start-up phase, where: i P =1, 2, 3, corresponding to the first minute, the second minute, and the subsequent stable operation period after starting up, that is, the power reaches stability after starting up for 2 minutes; i Q =1, 2, 3, 4, corresponding to the 1st minute, 2nd minute, 3rd minute after starting up, and then the stable operation period, that is, the heating capacity reaches stability after 3 minutes after starting up, and then 4 BP neural networks are trained .

[0049] The BP neural netwo...

Embodiment 3

[0052] In this embodiment, based on the established dynamic model, the outdoor meteorological parameters are determined according to the location of the project, and the indoor temperature T is determined according to the indoor thermal comfort requirements. in The allowable fluctuation range, at different outdoor temperature levels, by trying to calculate the indoor temperature under different water temperatures, determine the water temperature range that can keep the indoor temperature within the allowable range, so as to establish the variable return differential water temperature control strategy for the target system.

[0053] Furthermore, in the method, the water temperature range can be disassembled into a common water temperature set value T w,set Combination of upper and lower hysteresis mode, the target water temperature range can be expressed Format.

[0054] A feasible disassembly method for expressing the target water temperature range in this embodiment is:...

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Abstract

The invention relates to the technical field of heating and air conditioning equipment, in particular to an air source heat pump variable return difference water temperature control method and system based on supply and demand matching. A building model capable of reflecting room temperature response and fluctuation is established according to building thermal design and air tightness conditions; according to air source heat pump operation measured data, state recognition parameters are introduced to distinguish a starting stage and a stable operation stage, and a unit model capable of reflecting the start and stop dynamic processes and losses is established through a data driving algorithm; an end model considering the dynamic thermal process and a transmission and distribution model considering waterway inertia are established; an air source heat pump system dynamic model is formed according to the dynamic coupling relation among the unit heating capacity, the end heat supply capacity and the building heat dissipation capacity; and a variable return difference water temperature control strategy is established according to the indoor thermal comfort demand of the target system, and a unit is controlled to operate according to the variable return difference water temperature control strategy during operation. The problem of frequent start and stop of the air source heat pump unit in the low-load state is solved, the system performance is improved, the system power consumption is reduced, the noise influence in the start and stop process is reduced, and the method and system contribute to prolonging the service life of a compressor.

Description

technical field [0001] The invention relates to the technical field of heating and air-conditioning equipment, in particular to an air source heat pump variable return difference water temperature control method and system based on supply and demand matching. Background technique [0002] Coal-fired heating in winter in northern my country has caused huge energy consumption and serious environmental pollution problems. In 2017, my country's total energy consumption for building operations was 963 million tce, accounting for about 21% of the country's total energy consumption. Among them, the energy consumption for heating in northern towns was as high as 201 million tce, accounting for 21% of the total energy consumption for building operations. Emissions account for 22% of a building's operational carbon emissions. In order to promote building energy conservation and improve the atmospheric environment, the Chinese government proposed the "clean heating" policy in 2016 and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24D19/10F24F11/89F24F11/64F24F13/24F25B49/02
CPCF24D19/1006F24F11/89F24F11/64F24F13/24F25B49/022F24F2013/247
Inventor 徐昭炜徐策王智超徐伟孙晓雨王弈超杨强
Owner 佰沃思(北京)教育科技有限公司
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