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Theoretical and experimental research on effect of fins attachment on operating parameters and thermal efficiency of solar air collector

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Information Processing in Agriculture 2018年第4期5卷 411-421页

作者： Ali Daliran yahya ajabshirchi Department of Agricultural Machinery University of TabrizTabrizIran

Flat plate air collector is a type of heat exchanger which absorbs radiated solar energy and exchanges it to *** to low efficiency of this type of collectors,a suitable approach is investigated in this paper so as to increase thermal performance of the *** efficiency of solar collector for two models C1(without fins)and C2(with fins)both of 1 m^2 surface area with forced convection flow is studied theoretically and *** fins are attached over back board in air channel to create turbulence in air *** order to measure air temperature,17 thermal sensors(LM35)are exploited,among which 11 were mounted on absorber plate and the remaining 6 on the back *** design of experimental model are performed in Solidwork and programming of theoretical work in Matlab *** this research,a fan with constant mass flow rate of 0.033 kg/s is utilized for producing air *** indicate that applying fins in air channel not only reduces Nusselt number from 19.67 to 16.23,but also due to decreasing hydraulic diameter and creating air flow turbulence,causes increase of heat transfer coefficient from absorber plate to air flow and consequently reduction of total heat loss and higher outlet air *** difference of outlet air temperature between experimental and theoretical results for both collectors(C1 and C2)was recorded respectively as 7.6% and 9.4%.Thermal efficiency was respectively calculated 30% and 51% for experimental types with and without fins and 33% and 55% for those of theoretical work which generally seem reasonable.

关键词： Solar air collector Fins Thermal efficiency Energy efficiency Renewable energy

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Application of dynamic model to predict some inside environment variables in a semi-solar greenhouse

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Information Processing in Agriculture 2018年第2期5卷 279-288页

作者： Behzad Mohammadi Seyed Faramarz Ranjbar yahya ajabshirchi Department of Mechanical Engineering Mechanical Engineering FacultyUniversity of TabrizIran Department of Biosystems Engineering Faculty of AgricultureUniversity of TabrizIran

Greenhouses are one of the most effective cultivation methods with a yield per cultivated area up to 10 times more than free land cultivation but the use of fossil fuels in this production field is very *** greenhouse environment is an uncertain nonlinear system which classical modeling methods have some problems to solve *** are many control methods,such as adaptive,feedback and intelligent control and they require a precise ***,many modeling methods have been proposed for this purpose;including physical,transfer function and black-box *** objective of this paper is to modeling and experimental validation of some inside environment variables in an innovative greenhouse structure(semi-solar greenhouse).For this propose,a semi-solar greenhouse was designed and constructed at the North-West of Iran in Azerbaijan Province(38°10′N and 46°18′E with elevation of 1364 mabove the sea level).The main inside environment factors include inside air temperature(Ta)and inside soil temperature(Ts)were collected as the experimental data *** dynamic heat transfer model used to estimate the temperature in two different points of semi-solar greenhouse with initial *** results showed that dynamic model can predict the inside temperatures in two different points(Ta and Ts)with RMSE,MAPE and EF about 5.3C,10.2% and 0.78% and 3.45C,7.7%and 0.86%,respectively.

关键词： Semi-solar greenhouse Dynamic model Commercial greenhouse

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Modeling and experimental validation of heat transfer and energy consumption in an innovative greenhouse structure

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Information Processing in Agriculture 2016年第3期3卷 157-174页

作者： Morteza Taki yahya ajabshirchi Seyed Faramarz Ranjbar Abbas Rohani Mansour Matloobi Department of Biosystems Engineering Faculty of AgricultureUniversity of TabrizIran Department of Mechanical Engineering Mechanical Engineering FacultyUniversity of TabrizIran Department of Biosystems Engineering Faculty of AgricultureFerdowsi University of MashhadIran Department of Horticultural Science Faculty of AgricultureUniversity of TabrizTabrizIran

The commercial greenhouse is one of the most effective cultivation methods with a yield per cultivated area up to 10 times more than free land cultivation but the use of fossil fuels in this production field is very *** objectives of this paper are to modeling and experimental evaluation of heat and mass transfer functions in an innovative solar greenhouse with thermal *** this propose,a semi-solar greenhouse was designed and constructed at the North-West of Iran in Azerbaijan Province(38100N and 46180E with elevation of 1364 m above the sea level).The inside environment factors include inside air temperature below screen(Ta),inside air temperature above screen(Tas),crop temperature(Tc),inside soil temperature(Ts),cover temperature(Tri)and thermal screen temperature(Tsc)were collected as the experimental data *** dynamic heat and mass transfer model used to estimate the temperature in six different points of the semi-solar greenhouse with initial values and consider the crop *** results showed that dynamic model can predict the inside temperatures in four different points(Ta,Tc,Tri,Ts)with MAPE,RMSE and EF about 5-7%,1-2℃ and 80-91%for greenhouse without thermal screen and about 3-7%,0.6-1.8C and 89-96%for six different points of greenhouse with thermal screen(Ta,Tc,Tri,Ts,Tas,Tsc),*** results of using thermal screen at night(12 h)in autumn showed that this method can decrease the use of fossil fuels up to 58%and so decrease the final cost and air *** movable insulation caused about 15℃ difference between outside and inside air temperature and also made about 6℃ difference between Ta and *** experimental results showed that inside thermal screen can decrease the crop temperature fluctuation at night.

关键词： Semi-solar greenhouse Dynamic model Thermal screen Energy saving

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