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Articles by Mansoor Khan Khattak
Total Records ( 2 ) for Mansoor Khan Khattak
  Fahim Ullah , Mansoor Khan Khattak , Min Kang , Ninghui Li , Jun Yang and Xingsheng Wang
  Background and Objectives: In this study, the numerical simulation of the steady-state thermal performance of flat plate solar collector with double glass cover, physical model, validation and its grid independence test were performed with the finite volume method. Moreover, through comparison with the conventional plate heat collector, the effects of ambient temperature, the inlet water temperature, solar radiated intensity and lower glass cover position on thermal performance of the heat collector were investigated. Materials and Methods: For the simulation of FPSC with double glass covers different physical model, geometric and boundary condition were used and also regression analysis was applied on the data. Results: From the investigated results, it was cleared that, when the ambient temperature is below 18°C, the collector with double glass covers shows advantages, while when the ambient temperature is -10°C, the instantaneous efficiency of the flat plate solar collector with double glass covers was noted 0.26 higher than that of the conventional plate heat collector. Similarly, increase in the inlet water temperature and solar radiate intensity both results in an increase in the temperature inside the collector, which enhances the insulation effect of the double glass covers. Conclusion: When the inlet water temperature was 50°C, the instantaneous efficiency difference between the flat-plate solar collector with the double glass covers and the conventional one increases to 0.27. Furthermore, concluded from the results of the experiment that, when the lower glass cover is located 18 mm over the absorber plate and the solar radiated intensity is to be 1000 W m–2, the instantaneous efficiency of the flat-plate solar collector with the double glass covers can reach up to 0.678.
  Muhammad Hanif , Masood Ur Rahman , Muhammad Amin , Mansoor Khan Khattak , Muhammad Ramzan , Subhan Ud Din and Khanzeb Khan
  Solar drying of fruits, vegetables and grains is the oldest processing technique used for food preservation. In this research a flat plate solar air heater having an efficiency of 20% was used for drying onion flakes. The solar air heater assembly provides a temperature in the range of 40-50°C and humidity 10-30% in each day of drying period to the drying section. The drying section provides a total of 6 hours period per day as a suitable range for onions drying. Onions were dried and drying curves were developed for the drying kinetics of onions. The initial moisture in onions was 93% which was reduced to 5%. The moisture loss curve shows that onions lost 11% in each hour at an average. The drying curves of drying rate shows that the average drying rate of onions was 0.30 gH2O. gDM/h. Five published models (Newton, Page, Modified Page, Two-term expo and Wang) were tested to find relationship of drying curves with drying time. Among the five models Two-term expo model was the best describing drying kinetics on onions with R2 value 0.974 and Root Mean Square Error 0.447 for moisture lost and 0.953 and 0.451 for drying rate. It was concluded that flat plate solar air heater dries onions in short period of time. The quality of onions dried by a flat plate solar air heater may be better than open sun drying system. Among the five models Two-term expo model was the best describing drying kinetics on onions.
 
 
 
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