Feasibility Research Of Cold And Heat Sources System With Solar-Assisted Absorption Heat Pump In Lanzhou Region

With the rapid development of society and economy in China,the contradiction between energy consumption and environmental protection is becoming increasingly conspicuous.How to resolve this contradiction is a necessary problem to be solved in the course of our development.The concept of socialist ecological civilization has brought unprecedented attention to clean renewable energy and new energy-saving technologies.By combining clean renewable energy and the new types of energy-saving technologies,the consumption of fossil fuels can be reduced effectively and thereby the purposes of energy-saving and environmental protection can be achieved.Solar energy,as a typical representative of clean and renewable energy,can effectively replace fossil fuel.Absorption heat pump,as one of the new types of energy-saving technologies,has also been widely used in the fields of energy conservation and emission reduction.By combining the technologies of solar photo-thermal conversion and absorption heat pump（AHP）,the design schemes and the technological running modes of cold and heat source system with solar-assisted absorption heat pump（CHSSSAAHP）is proposed in this paper.By means of TRNSYS（Transient System Simulation Program）software,the simulation model o f this CHSSSAAHP is set up to apply to an office building in Lanzhou city.The feasibility of cooling and heating operation conditions for this CHSSSAAHP is verified.The main research tasks and contents in this paper are given as follows:1.The design schemes and technological processes of this CHSSSAAHP are proposed and the corresponding operating modes are set according to the operation conditions of cooling,heating and producing hot water in order to make full use of this system’s functions.Considering an office building in Lanzhou area as its application plant,the main components in this CHSSSAAHP are determined.2.On the basis of the mechanism of thermodynamics and heat transfer and analyzing the mass and energy balance for working substances during the operation of AHP unit,the mathematical model of AHP unit is established and each module of AHP unit is programmed by MATLAB software and then these modules are led into TRNSYS software.So the problem that AHP unit is not set up by TRNSYS software directly is solved.The influence of the inlet water temperature of each heat exchange component of AHP on the performance of the unit is analyzed,and the design parameters of the AHP are optimized according to the obtained results.The corresponding simulation model of this CHSSSAAHP is configured by TRNSYS software.3.Based on the above simulation model,the corresponding running status for this CHSSSAAHP on the typical days in summer and winter and the time periods of cooling and heating are analyzed,respectively.Analyzing the corresponding results,this CHSSSAAHP is feasible and the variations and the related values of some main performance parameters to characterize its operation condition such as solar satisfying ratio,water supply temperature,COP（Coefficient of Performance）,energy consumption,etc,are obtained,which can realize the desired objectives of cooling and heating.4.By connecting the data between GENOPT（Generic Optimization Program）and TRNSYS,a particle swarm optimization algorithm（PSO）is used to optimize some key structural parameters of this CHSSSAAHP in order to realize the objectives of reducing the initial capital invested for the equipments and the related operating cost.5.The annual cost method is used to analyze the economy of this CHSSSAAHP,and its environmental protection is analyzed through the calculation of CO₂ emissions.In addition,comprehensive assessment for this CHSSSAAHP and the other types of cold and heat source systems is carried out by the analytic hierarchy process.The results show that the comprehensive score of this CHSSSAAHP is better than those of the other types of cold and heat source systems,which may give certain reference for the comprehensive application of solar energy in northern region.