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Design and Simulation of Sewage-Source Heat Pump System with Multilevel Sprinkling Heat Exchanger

Author: ShaoZuoWen
Tutor: YaoYang
School: Harbin Institute of Technology
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Sewage heat energy resources Water source heat pump Spray heat Performance Simulation System optimization
CLC: TQ460.9
Type: Master's thesis
Year: 2010
Downloads: 71
Quote: 1
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Abstract


Based on a pharmaceutical factory in Harbin sewage treatment for cold regions, the temperature of the sewage treatment process encountered the colder months, heating energy consumption problem, design a set of recycling water treatment secondary effluent heat sewage source heat pump system to enhance the the sewage aeration link temperature. The original system has been improved on the basis of the previous design, the use of sewage side of the series, a separate connection for refrigerant side, driven by the three screw compressors the three spray heat exchanger and the three evaporator each level of the system design and operation of the process, at all levels of the operating parameters are better targeted and adjustable. For spray heat the structure and size of the detailed design calculations, by analyzing the number of columns, diameter and tube length parameters on heat transfer, determine the size of the heat exchanger. At the same time, the analysis of the impact of fouling on heat exchanger design size and performance, the adverse effects of fouling resistance on heat transfer aggravated with the increase of the heat transfer coefficient. Using MATLAB modeling of the various components of the system. Compressor performance sample regression fit to establish the relationship between the compressor characteristics and evaporating temperature, condensing temperature; partition lumped parameter method to establish the spray heat mathematical model; lumped parameter method to establish electronic expansion valve and a mathematical model of the evaporator. SM method, according to the law of conservation of the three, the use of MATLAB software, the preparation of the compressor, condenser, electronic expansion valve and evaporator components function, steady-state simulation program. Use of the simulation program, the design of the sewage source heat pump system design conditions and variable conditions to run the simulation, and analysis of the results, the details of the optimization modified spray heat exchanger size, and on this basis the operation of the system variable conditions, sewage flow, condenser and evaporator sewage inlet temperature and other environmental parameters on system performance, analyze system performance trends with environmental parameters and sensitivity of the prediction system adaptability and run under variable environmental conditions should pay attention to. According to the results of the simulation run on the new system optimization and improvement of progressively decreasing evaporation temperature, the three condenser and the three evaporator reverse connect two improvement programs, and the use of simulation procedures are the result of the improved operation of the system, through the several systems of comparative analysis of the performance characteristics of each system, and provides a basis for the optimal design of the sewage source heat pump system with three spray heat.

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CLC: > Industrial Technology > Chemical Industry > Pharmaceutical chemical industry > General issues > Waste processing and comprehensive utilization
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