Thermodynamic Analysis And Optimization For Air Conditioning Systems

With the development of the air conditioning energy consumption in building energy consumption in increasing proportion, the research of energy-saving air conditioning system becomes more and more pressing. At present, research on energy saving air-conditioning systems remains in the first law of thermodynamics and second law of thermodynamics basis. This method often leads to the illusion that "energy saving and not saving money". It is necessary to use exergy analysis and economic factors, such as the combination of thermal analysis methods of economics analysis and optimization of air conditioning systems.Use of thermodynamic modeling, the air conditioning system is divided into heating and cooling systems, air handling systems and air conditioning system at the end of three subsystems. Established air conditioning systems and various subsystems exergy analysis and thermol-economic analysis of the physical model.Exergy balance equation through the thermol-economics built with air-conditioning system costs equation and various subsystems exergy losses, exergy efficiency and exergy cost of the mathematical model. Through the establishment of the Lagrange equations, combined with marginal cost and the concepts of exergy, the target function is defined as exergy efficiency, the various subsystems into the exergy with the Lagrangian variables of cost function, To explore the economic isolation of the heat principle in the air conditioning system.On the air-cooled heat pump units, direct-fired lithium bromide chiller and water chiller air conditioning system plus three types of gas boilers and heat source, as the frequent method, the load energy consumption analysis, exergy analysis and thermol-economics. Direct-fired lithium bromide absorption chiller in the cooling and heating when the exergy loss and exergy annualized cost is the highest, the year of air-cooled heat pump unitexergy with the lowest cost, water chillers in the cooling condition improve the highest exergy efficiency. Analysis of energy prices on the unit operating cost. The use of natural gas and electricity in the presence of a thermal power than the balance.The new wind and were treated return air of VAV system, air fan coil air-conditioning systems and fixed air conditioning system using three kinds of air handling system software DeST energy consumption analysis, exergy analysis and thermol-economics. In all of the building, fresh air and return air are handled VAV system energy is minimal, the highest exergy efficiency and unit costs and unit heating cooling lowest cost; air fan coil system and then set air conditioning system the worst. Exergy efficiency of air conditioning systems, exergy efficiency and air conditioning systems with the scale of the cost of running the state and other factors.Shopping in the Jinan city, the air-conditioning system of a thermal-economics. Calculation of the cooling water system, refrigerator, air treatment systems, air-conditioning at the end of the exergy losses, exergy efficiency, product, and exergy unit cost of exergy loss. Air Conditioning System and then find the existence of this weak link, put forward suggestions for improvement.