Extended Development On The Digital Design System For Air Handling Unit

Combined air conditioning is a air handling equipment without coldand heat source, it can supply air, cool, heat, humidity air, purify air andreduce noise.The traditional design progress of the air handling unit is:design–manufacture–experiment–improved design–manufacture–experiment.This design method is high cost, long cycle and low efficiency,and it difficult to optimize the units.Therefore,it will be low cost and moreefficient to use the modern simulation technology to replace the complexexperiment and develop a kind of software for air handling units which cancombine function section.Under the direction of professor GuBo, and withthe cooperation of FengShen group, our subject team group has developeda set of design system for Air handling units.In this thesis, the digital design system has been extended developedfrom the functional model and software technology according to thecompany’s needs. Further improve the original system, making it morepowerful. And then the system can more efficiently use in the practicedevelopment and design for air handling units.Functional model:Firstly, heat recovery module has been developed, it includes coiltype (also called liquid circulation) heat recovery, wheel heat recovery andplate heat recovery. Coil type heat recovery is a coupling system composedby two groups of finned tube exchanger, a simulation model based onlumped parameter method has been established for it; Detailed theoreticalanalysis of heat and mass transfer mathematical mode for wheel heatrecovery has been carried on, wheel recovery efficiency curve has alsobeen fitting on the basis of least square method. Then, establish a rapid calculation model suitable for engineering application, this model cansimulate the wheel performance.Secondly, expand and optimize the fin-tube heat exchanger module,appropriate and effective algorithms under different known conditions aredevised to design the structural parameters of heat exchanger in order tomeet the needs of different situations. The distributed parameter model isused to optimize the heat exchanger original simulation model. Then, useexperimental data to validate the simulation model show that thesimulation and experimental data match well. And the model afteroptimization is more consistent with the experimental results.Thirdly, steam heating simulation module is corrected by the fin-tubeheat exchanger mathematical physical model established on the basis ofenergy conservation equation, momentum conservation equation and heattransfer equation, According to weight control, transition zone and shearcontrol section select the empirical correlations in steam side.Software technology:Develop a digital design and simulation platform for combined aircondition system which can configure double units; The heat recoveryfunction modules are configured into the system; Wet air handling processcurve can be automatic drawn and edited in enthalpy wet diagram afterexpansion, and single point or multipoint wet air property calculation canalso be carried on in this module; Improve the English version software,make interface operation, technical list output realize the full Englishoperation; Expand project import and export function which can importand export each functional section detail design information in order toconvenient communication; At the same time, expand the air conditioningdouble unit dividor and automatic draw CAD engineering drawings, etc...