Lithium bromide air conditioning system integrality optimization control method and system

A technology for optimizing control and air conditioning systems, applied in air conditioning systems, space heating and ventilation, heating and ventilation control systems, etc., and can solve problems such as energy waste and waste

Pending Publication Date: 2021-11-30
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of the above-mentioned prior art, such as the lack of regulation and control of the lithium bromide absorption refrigeration system as a whole, resulting in waste of energy consumption, and to provide a method and system for optimally controlling the integrity of the lithium bromide air conditioning system

Method used

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  • Lithium bromide air conditioning system integrality optimization control method and system
  • Lithium bromide air conditioning system integrality optimization control method and system
  • Lithium bromide air conditioning system integrality optimization control method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0070] A lithium bromide air conditioning system integrity optimization control method, comprising the following steps:

[0071] Step 1) set up the model of each component of lithium bromide unit, comprise high pressure generator model, low pressure generator model, absorber model, high temperature solution heat exchanger model, low temperature solution heat exchanger model, evaporator model and condenser model;

[0072] Step 2) based on the model of each component of the lithium bromide unit, obtain the operating data of the actual lithium bromide unit, and establish the variable working condition simulation model of the lithium bromide unit based on the operating data;

[0073] Step 3) set up cooling tower model;

[0074] Step 4) Coupling the cooling tower model and the variable operating condition simulation model of the lithium bromide unit to obtain a complete lithium bromide refrigeration system, with the cooling water flow and the cold water flow as parameters to be opt...

Embodiment 2

[0077] A lithium bromide air conditioning system integrity optimization control method, comprising the following steps:

[0078] S1. For the lithium bromide unit, the model is divided into components, and then the idea of ​​coupling the internal components is adopted. The coupling diagram is as follows figure 1 As shown, where the steady-state distribution parameter model is used for the evaporator, the heat transfer process of the evaporator can be expressed as (the condenser model is the same), the principle is as follows figure 2 Shown:

[0079] m q C p (t q2 -t q1 ) = θm z (h z1 -h z2 ) (1)

[0080] Among them, m q is cold water flow / kg s -1 ;C p Specific heat capacity / kJ (kg K) -1 ;t q2 is the outlet temperature of the refrigerant / °C; t q1 is the evaporation temperature / °C; θ is the heat dissipation coefficient; m z is the flow rate of refrigerant / kg·s -1 ; h z1 Enthalpy value of refrigerant inlet / kJ kg -1 ; h z2 Enthalpy value of refrigerant outlet / kJ...

Embodiment 3

[0185] For the following lithium bromide air conditioning system: the design parameters are shown in Table 1.

[0186]

[0187]

[0188] Assume that the load on a certain day is:

[0189]

[0190] Bring the above data into the optimal control method of the lithium bromide air conditioning system, and combine it with the local air temperature before heat exchange of 30°C.

[0191] Use the optimization algorithm to calculate the optimal cooling water flow and the cooling water flow as:

[0192] time Cooling water side flow / kg·s-1 Cold water flow / kg·s-1 8：30 52.16 68.78 9：30 53.45 69.70 10：30 53.34 69.40 11：30 52.56 69.05 12：30 52.48 69.26 13：30 51.49 69.12 14：30 51.71 68.69 15：30 51.39 68.91 16：30 52.36 68.76

[0193] Using the optimization algorithm to calculate the temperature difference between the optimal cooling water side and the cooling water side is:

[0194]

[0195]

[0196] Applyi...

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Abstract

The invention discloses a lithium bromide air conditioning system integrality optimization control method and system, and belongs to the technical field of lithium bromide air-conditioning system energy conservation. A lithium bromide unit and a cooling tower are modeled, chilled water flow and cooling water flow are optimized by applying an optimization algorithm, and optimized values serve as set values to be provided for bottom layer closed-loop control. A lithium bromide air conditioning system operates at the optimal state point, and establishment of heat transfer models of the components has representativeness and certain accuracy. According to the lithium bromide air conditioning system integrality optimization control method and system, modeling analysis is conducted on all parts of the lithium bromide air conditioning system, a brand new lithium bromide air conditioning system integral control strategy is determined through combination with the particle swarm optimization algorithm, the influence of external interference and the control strategy on the system is fully considered in the period, corresponding correction and compensation measures are set, and high engineering practical significance is achieved.

Description

technical field [0001] The invention belongs to the technical field of energy saving of lithium bromide air conditioning systems, and relates to a method and system for integral optimization control of lithium bromide air conditioning systems. Background technique [0002] Lithium bromide absorption equipment is one of the commonly used central air-conditioning equipment because of its high efficiency and low pollution. In addition, lithium bromide absorption equipment has very important application value in the reuse of waste energy, the most important is for thermal power generation The secondary utilization of hot water and steam discharged from the plant has produced huge economic value in practical projects. [0003] The existing central air-conditioning system with lithium bromide absorption chilled water equipment as the main cold and heat source equipment, in the actual operation process, is similar to the traditional air-conditioning system, and still has the proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F5/00F24F11/46F24F11/63F24F11/88F25B49/04
CPCF24F5/0014F24F11/46F24F11/88F24F11/63F25B49/04
Inventor 王军冯雷
Owner XI AN JIAOTONG UNIV
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