复合冷凝过程热力学仿真与优化研究
发布时间：2018-07-26 11:37
【摘要】：相比常规的制冷系统,复合冷凝空调系统可回收冷凝器排放的废热、增加了系统的制冷能力、降低了压缩机的排气压力。然而,复合冷凝空调系统在应用中仍有一些问题有待解决。这些问题包括：由于增加了热回收装置,系统运行参数发生改变,导致系统效率降低或不能平稳运行；冷热源设备匹配不合理,整体优化差而造成能量浪费；卫生热水装置与冷凝器联合工作的运行参数选择有盲目性；实际运行和测试中缺乏简便的评价和操作方法；替代制冷剂在复合冷凝系统中的运行特性不同于系统的运行制冷剂为R22。而这些研究方向对系统的稳定运行及提升系统的性能具有重要作用。针对上述出现的问题,本文研究了应用复合冷凝技术之后系统的运行特性。由于大温差变化所导致的传热过程随时间的变化,论文对几种典型复合冷凝过程开展了仿真研究：包括大型水冷离心式制冷机组、风冷热泵机组、多功能热泵热水机组实验装置和替代制冷剂复合冷凝过程的仿真。 第一,应用(?)分析对大容量的离心式冷水机组水冷+水冷模式的复合冷凝过程建立了卫生热水水温上升的动态数学模型和机组的动态数学模型。提出将卫生热水水温从进口初始温度上升到用户要求温度所需的时间为一计算周期来评价和计算热回收系统的性能。提出了机组热回收效率(卫生热水生产效率)和机组效率的积分累积数学模型。为机组效率的计算提供了更合理的计算方法。应用SIMULINK仿真软件搭建了离心式冷水机组复合冷凝过程的仿真模型,并用实验数据进行了验证。得出了系统运行参数与时间的关系,然后利用该仿真模型求得系统优化参数。 第二,应用(?)析对风冷热泵机组的复合冷凝过程建立了卫生热水水温上升的代数累积数学模型,并据此建立了风冷热泵机组复合冷凝过程的代数累积数学模型。提出了机组热回收效率(卫生热水生产效率)和机组效率的求和计算方法。然后运用SIMULINK软件建立了风冷热泵机组复合冷凝过程的仿真模型,并用实验数据进行了验证。 第三,对多功能热泵热水空调机组进行了实验研究。分析了机组各部件性能参数随运行时间的变化情况。并将实验结果与风冷热泵复合冷凝热回收仿真结果进行了对比分析。验证了风冷热泵复合冷凝仿真模型的可靠性。然后,应用机组热回收效率(卫生热水生产效率)和机组效率的计算方法,结合风冷+水冷模式的热泵机组实例,提出了便于实际测量的测试方法。 最后,分析了替代制冷剂在复合冷凝系统中应用的趋势。应用风冷热泵机组复合冷凝过程的代数累积数学模型,建立了氟系替代制冷剂R407C和R410A在风冷热泵复合冷凝系统中的SIMULINK仿真模型。对仿真模型在制冷模式下的可靠性进行了验证。然后将该仿真模型应用于氟系替代制冷剂R407C和R410A在风冷热泵系统复合冷凝过程中的运行特性计算,与R22系统的性能作了对比分析。并针对CO2制冷/热泵系统进行了仿真分析,应用风冷热泵机组复合冷凝过程的离散模型数学模型,建立了在制冷和复合冷凝过程的SIMULINK仿真模型。对CO2制冷/热泵系统制冷循环模式下的仿真模型进行了验证,然后对CO2制冷/热泵系统复合冷凝模式进行了计算,与R22系统的性能作了对比分析。并将CO2制冷/热泵系统应用复合冷凝模式前后机组的性能做了比较。为替代制冷剂在复合冷凝过程中的应用提供了理论基础。
[Abstract]:Compared with the conventional refrigeration system, the composite condensing air conditioning system can recover the waste heat from the condenser discharge, increase the system's refrigeration capacity and reduce the exhaust pressure of the compressor. However, there are still some problems to be solved in the application of the composite condensing air conditioning system. These problems include the increase of the heat recovery device and the operation parameters of the system. The system efficiency is reduced or not run smoothly; the matching of the cold and heat source equipment is unreasonable and the overall optimization is poor, and the energy waste is caused. The selection of the operating parameters of the joint work of the hot water heater and the condenser is blind; the practical operation and test lack of simple evaluation and operation method; the substitution of refrigerant in the compound condensing The operating characteristics of the system are different from the system operating refrigerants (R22.). These research directions play an important role in the stable operation of the system and the performance of the hoisting system. In this paper, the operating characteristics of the system after the application of the combined condensation technology are studied. The simulation of several typical condensing processes, including large water cooling centrifugal refrigerating unit, air cooled heat pump unit, multi-function heat pump water heater unit and alternative refrigerant combined condensation process, is carried out in this paper.
First, the dynamic mathematical model of hot water temperature rising and the dynamic mathematical model of the unit are established by using (?) analysis of the combined condensing process of the water cooling and water cooling model of large capacity centrifugal chiller, and the time required to increase the temperature of the hot water from the initial temperature of the inlet to the user's requirement is given as a calculation period. The performance of the heat recovery system is calculated and calculated. The integral accumulative mathematical model of the heat recovery efficiency (hot water production efficiency) and unit efficiency is put forward. A more reasonable calculation method is provided for the calculation of unit efficiency. The simulation model of the compound condensing process of the centrifugal chiller is built by using the SIMULINK simulation software, and the experiment number is used. The relationship between system operation parameters and time is obtained, and then the optimization parameters are obtained by using the simulation model.
Second, the algebraic accumulative mathematical model of the temperature rising of the hot water hot water is established by analyzing the combined condensing process of the air cooled heat pump unit, and the algebraic cumulative mathematical model of the combined condensation process of the air cooled heat pump unit is set up, and the calculation method of the heat recovery efficiency of the unit and the efficiency of the unit is put forward. Then, the simulation model of the compound cooling process of air-cooled heat pump is established by using SIMULINK software and verified by the experimental data.
Third, the experimental research on the multi-function heat pump hot water air conditioning unit is carried out. The changes of the performance parameters of the unit components with the running time are analyzed. The experimental results are compared with the simulation results of the combined condensation heat recovery of the air cooled heat pump. The reliability of the combined condensation simulation model of the air cooling heat pump is verified. Then, the application unit is applied. The calculation method of heat recovery efficiency (the efficiency of sanitary hot water production) and the efficiency of the unit, combined with the example of heat pump unit of air cooling and water cooling mode, put forward the test method which is convenient to measure.
Finally, the trend of the application of the alternative refrigerant in the compound condensing system is analyzed. The algebraic cumulative mathematical model of the combined condensation process of the air cooled heat pump unit is applied to establish the SIMULINK simulation model of the fluorine substitution refrigerant R407C and R410A in the air-cooled heat pump compound condensing system. The simulation model is applied to the calculation of the operating characteristics of the fluorine substitution refrigerant R407C and R410A during the combined condensation process of the air cooled heat pump system. The performance of the R22 system is compared with the performance of the system. The simulation analysis of the CO2 refrigeration / heat pump system is carried out and the discrete model mathematical model of the combined condensation process of the air cooled heat pump unit is applied. The SIMULINK simulation model of the refrigeration and condensing process is established. The simulation model of the refrigeration cycle mode of the CO2 refrigeration / heat pump system is verified. Then the combined condensing mode of the CO2 refrigeration / heat pump system is calculated, and the performance of the R22 system is compared and analyzed. And the CO2 refrigeration / heat pump system is applied to the compound condensing die. The performance of the front and rear units is compared, which provides a theoretical basis for the application of refrigerants in the process of compound condensation.
【学位授予单位】：湖南大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU831.6
本文编号：2145886
[Abstract]:Compared with the conventional refrigeration system, the composite condensing air conditioning system can recover the waste heat from the condenser discharge, increase the system's refrigeration capacity and reduce the exhaust pressure of the compressor. However, there are still some problems to be solved in the application of the composite condensing air conditioning system. These problems include the increase of the heat recovery device and the operation parameters of the system. The system efficiency is reduced or not run smoothly; the matching of the cold and heat source equipment is unreasonable and the overall optimization is poor, and the energy waste is caused. The selection of the operating parameters of the joint work of the hot water heater and the condenser is blind; the practical operation and test lack of simple evaluation and operation method; the substitution of refrigerant in the compound condensing The operating characteristics of the system are different from the system operating refrigerants (R22.). These research directions play an important role in the stable operation of the system and the performance of the hoisting system. In this paper, the operating characteristics of the system after the application of the combined condensation technology are studied. The simulation of several typical condensing processes, including large water cooling centrifugal refrigerating unit, air cooled heat pump unit, multi-function heat pump water heater unit and alternative refrigerant combined condensation process, is carried out in this paper.
First, the dynamic mathematical model of hot water temperature rising and the dynamic mathematical model of the unit are established by using (?) analysis of the combined condensing process of the water cooling and water cooling model of large capacity centrifugal chiller, and the time required to increase the temperature of the hot water from the initial temperature of the inlet to the user's requirement is given as a calculation period. The performance of the heat recovery system is calculated and calculated. The integral accumulative mathematical model of the heat recovery efficiency (hot water production efficiency) and unit efficiency is put forward. A more reasonable calculation method is provided for the calculation of unit efficiency. The simulation model of the compound condensing process of the centrifugal chiller is built by using the SIMULINK simulation software, and the experiment number is used. The relationship between system operation parameters and time is obtained, and then the optimization parameters are obtained by using the simulation model.
Second, the algebraic accumulative mathematical model of the temperature rising of the hot water hot water is established by analyzing the combined condensing process of the air cooled heat pump unit, and the algebraic cumulative mathematical model of the combined condensation process of the air cooled heat pump unit is set up, and the calculation method of the heat recovery efficiency of the unit and the efficiency of the unit is put forward. Then, the simulation model of the compound cooling process of air-cooled heat pump is established by using SIMULINK software and verified by the experimental data.
Third, the experimental research on the multi-function heat pump hot water air conditioning unit is carried out. The changes of the performance parameters of the unit components with the running time are analyzed. The experimental results are compared with the simulation results of the combined condensation heat recovery of the air cooled heat pump. The reliability of the combined condensation simulation model of the air cooling heat pump is verified. Then, the application unit is applied. The calculation method of heat recovery efficiency (the efficiency of sanitary hot water production) and the efficiency of the unit, combined with the example of heat pump unit of air cooling and water cooling mode, put forward the test method which is convenient to measure.
Finally, the trend of the application of the alternative refrigerant in the compound condensing system is analyzed. The algebraic cumulative mathematical model of the combined condensation process of the air cooled heat pump unit is applied to establish the SIMULINK simulation model of the fluorine substitution refrigerant R407C and R410A in the air-cooled heat pump compound condensing system. The simulation model is applied to the calculation of the operating characteristics of the fluorine substitution refrigerant R407C and R410A during the combined condensation process of the air cooled heat pump system. The performance of the R22 system is compared with the performance of the system. The simulation analysis of the CO2 refrigeration / heat pump system is carried out and the discrete model mathematical model of the combined condensation process of the air cooled heat pump unit is applied. The SIMULINK simulation model of the refrigeration and condensing process is established. The simulation model of the refrigeration cycle mode of the CO2 refrigeration / heat pump system is verified. Then the combined condensing mode of the CO2 refrigeration / heat pump system is calculated, and the performance of the R22 system is compared and analyzed. And the CO2 refrigeration / heat pump system is applied to the compound condensing die. The performance of the front and rear units is compared, which provides a theoretical basis for the application of refrigerants in the process of compound condensation.
【学位授予单位】：湖南大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU831.6
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