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Refrigerating machine room energy-saving optimization method and system based on chilled water and cooling water variable flow decoupling

A refrigeration machine room and optimization method technology, applied in neural learning methods, design optimization/simulation, computer-aided design, etc., can solve problems such as instability, energy-saving optimization of refrigeration room, unadjustable control equipment, unscientific control strategies, etc., to achieve Intuitive effect of the model

Pending Publication Date: 2020-12-15
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, with the gradual deepening of research on energy-saving technologies for refrigeration rooms, a variety of new energy-saving technologies and adjustment measures have been applied to the energy-saving renovation of refrigeration rooms. Science, unsatisfactory energy saving effect and other issues

Method used

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  • Refrigerating machine room energy-saving optimization method and system based on chilled water and cooling water variable flow decoupling
  • Refrigerating machine room energy-saving optimization method and system based on chilled water and cooling water variable flow decoupling
  • Refrigerating machine room energy-saving optimization method and system based on chilled water and cooling water variable flow decoupling

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Embodiment 1

[0077] In this embodiment, a cooling water inlet temperature modeling method based on GRNN is disclosed, which provides a reliable theoretical basis for improving the energy efficiency model of chiller.

[0078] Because the cop of chiller is affected by many factors, such as partial load rate, chilled water supply and return temperature, cooling water inlet and outlet temperature, chilled water flow and cooling water flow, and there are complex interactive relationships among various influencing factors.

[0079] In order to clarify the influence degree of each operating parameter on the operating energy efficiency of the chiller, the invention uses SPSS software to analyze the correlation between the operating energy efficiency of the chiller and multiple influencing factors, and carries out the correlation analysis through Pearson correlation coefficient and bilateral significance test. The results are shown in Table 1. The correlation between the cooling water inlet temperature...

Embodiment 2

[0107] In this embodiment, the polynomial regression method is used to obtain the relationship curve between the power of the water pump and the flow, which is as follows:

[0108] Step 1. Select the expression. For variable frequency water pump, the power calculation formula under full load condition is as follows:

[0109]

[0110] η＝η p · η m · η VFD (8)

[0111] Where, P pump Is the pump power, kW; ρ Is the density of the fluid, kg / M 3 ； G is gravitational acceleration, M / S 2 ； M is the volume flow of fluid, M 3 / h； H is the head of the water pump, m; η Is the total efficiency of the water pump; η p Is the pump efficiency; η m Is the motor efficiency; η VFD Is the efficiency of the frequency converter.

[0112] From the actual analysis, the variable frequency pump operates under partial load most of the time, and its power model can be expressed as a polynomial relationship with flow, and the expression is as follows:

[0113]

[0114] Where M rated Is the rated flow o...

Embodiment 3

[0117] This example is the application of variable flow decoupling control strategy of chilled water and cooling water on TRNSYS simulation platform. Combined with the research object of the comprehensive office building of the invention, the load characteristics and pressure loss of each loop of the air conditioning cold source system are quite different, and the rooms on each floor need to have personalized settings and other characteristics. Selecting the differential pressure control of the fixed supply and return water main pipe as the variable flow control mode of chilled water can meet the above requirements. On the cooling water variable flow side, since most of the operation of the air conditioning cold source system is under partial load, the constant temperature difference control method is adopted, which is equivalent to the proportional change of the cooling water flow with the load. The control method is simple and effective. Therefore, the constant temperature diffe...

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Abstract

The invention discloses a refrigerating machine room energy-saving optimization method and system based on chilled water and cooling water variable flow decoupling. According to the method, on the basis of an original water chilling unit MP model, a cooling water inlet temperature modeling method based on a GRNN is applied to improve the model. Through equipment modeling, system simulation, orthogonal test and regression analysis, when the cold load of a building is determined, an orthogonal test method suitable for variable-flow decoupling of chilled water and cooling water in a refrigeratingmachine room is used; parameter values of a chilled water flow, a cooling water flow, a chilled water supply temperature and a cooling water inlet temperature which enable the total energy consumption of the refrigerating machine room to be minimum under the condition are determined, the energy consumption of each piece of equipment and system before and after optimization is compared, and each piece of equipment is adjusted correspondingly; therefore, theoretical basis and technical guidance are provided for energy-saving transformation of a water chilling unit and a refrigerating machine room.

Description

technical field [0001] The invention relates to an energy-saving optimization method of a refrigerator room, in particular to an energy-saving optimization method and system of a refrigerator room based on variable flow decoupling of chilled water and cooling water. Background technology [0002] The most important task of energy conservation of large public buildings is the energy conservation of air conditioning system. To realize the energy conservation of air conditioning system, we must solve the problem of low energy efficiency under partial load operation. The application of variable flow technology can ensure the efficient operation of the refrigeration system to a certain extent. Therefore, based on the research of variable flow of air conditioning water system, effective energy management of the refrigeration system is of great significance for energy conservation and consumption reduction of public buildings. [0003] At present, with the gradual deepening of the resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/27G06F17/18G06N3/04G06N3/08G06F119/06G06F111/10
CPCG06F30/27G06F17/18G06N3/08G06F2119/06G06F2111/10G06N3/045
Inventor 闫秀英许成炎景媛媛范凯兴许珂
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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