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SOLAR COOKER PDF

Wednesday, May 1, 2019


of solar energy devices like solar cooker, solar water heater, solar .. Followings instructions are associated with the full load test of box type solar cooker. PDF | Solar cooking is one of the best clean and environment Different types of solar cookers are designed and developed around the world. PDF | Fossil fuels are today's most accessible sources of energy. However due to their limited resources and greenhouse gas emission, the use of renewable.


Solar Cooker Pdf

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of solar cooker, energy and exergy analysis approach and economic evolution cooker. Thermal performance of box type and concentration type solar cookers. rachel andres, Director, Solar Cooker Project of Jewish World Watch solar cooker .. Appendix A contains detailed instructions on how to use a solar cooker. This booklet includes solar cooking concepts, solar cooker construction plans and Follow regular canning instructions: fill jars almost to the top with fruit and .

The heat was supplied by heat transfer fluid to thermal storage unit by natural convection process. In this system supply of energy was two way, firstly energy supplied by the heat transfer fluid to the cooking pot and secondly energy supplied by electrical means. This system provides the facility of using electricity and solar energy according to the temperature available at the cooking pot.

The temperature at different points can be monitored using temperature sensors. The temperature thus obtained can be set as the input to compare with a reference value set in the data logger say a PIC micro-controller through a simple program. The performance of this cooking unit can be controlled effectively by varying the fluid flow rate from collector to thermal storage unit and from thermal storage unit to the heat exchanger.

Modeling Equations The solar cooker can be modelled by considering all the inputs,losses and outputs. The input to the solar cooker is purely from sunlight and the electric supply will be actuated only if the solar power is not sufficient.

So for normal analysis,here considering only the solar power input to the collector and the stored heat energy in PCM material as a result of this. Also the temperature distribution of the PCM material surrounding the cooking pot is also assumed to be constant for analysis. Then a hybrid solar cooker consists of an evacuated tube collector,latent heat storage,cooking vessel,pumps and flow rate control is also simulated at the same ambient temperature conditions.

The ambient temperature was set at C in both cases. Simulations were done for both for analysing their heat gain and increase in temperature.

Conventional solar cooker component models the thermal performance of a theoretical flat plate collector with no heat storage. The entire collector array might consist of collectors connected in series and in parallel. The thermal performance of the entire collector array is decided by the number of modules in series and also the characteristics of every module. This model provides for the theoretical analyses of a flat plate collector.

Normal solar cooker characteristics are almost similar to a solar collector which is a default component available in TRNSYS.

Hottel-Whillier steady-state model is employed for evaluating the thermal performance. The collector that has an area of 1 m2 is simulated with water as the heat transfer fluid. From Fig. In conventional system,there is no auxiliary sources of heating other than solar radiation.

So the output will be purely dependent upon the availability of solar radiation and it is clear from the characteristics of conventional system of solar cooking. It is similar to the basic solar water heater with slight modifications including the provision for auxiliary heating and latent heat storage.

Here also water is used as the heat transfer fluid. Simulation time was set for 24hours with same input conditions for both solar cookers,conventional and hybrid.

The heat gain at the cooking pot is determined by the difference in inlet and outlet temperatures. In proposed hybrid solar cooking system,the cooking vessel temperature is maintained constant by providing auxiliary heating at the cooking pot. Figure 4: a Simulation model of hybrid cooker in TRNSYS b Temperature distributions,cookingpot temperature and auxiliary heating of hybrid cooker The outlet temperature of collector is improved in hybrid system by means of properly controlling the outlet flow rate so that it can reach upto about C.

The cooking pot temperature attained is almost C in hybrid solar cooker and thus the overall efficiency can be improved. T 2,T3,T4,T5 and Tbottom are the temperatures at different locations around the pot which is surrounded by heat storage material erythyritol which has the ability to store at Whenever the actual temperature of cooking vessel falls below a fixed value,say 50 0C the auxiliary heating source Qaux will provide sufficient heat to maintain the cooking vessel temperature at 95 0C.

The hybrid solar cooker is an alternate to rectify the disadvantages of conventional solar cooker and use of maximum accessible solar radiation along with alternate sources.

A hybrid cooker with PCM storage and electric heating source was able to store thermal energy in the form of latent heat and sensible heat throughout the daytime and release the same after the sunshine hours.

Mirdha et. The analyzed, so that a final design of the solar cooker has performance of the design was also evaluated as a hot been achieved, which has been practically water system and the maximum efficiency was found implemented.

A systems. A west tracking is also required. By using combination simple economic analysis illustrate that this kind of of side booster mirrors three different reflections will multi-purpose design could be financially viable and be received by the collecting surface.

The net physically useful. Harmim et. The finned absorber enhances the rate of heat transfer to the air inside the cooker. Fins are of rectangular constant cross-section 50 cm by 0. For comparative purpose a series of experiments have been performed under Adrar prevailing weather conditions in July The comparison of the performances of the two cookers indicates that the cooker equipped with the finned absorber plate provides higher stagnation Fig.

For comparison, a conventional box type The following two tests have been performed solar cooker of exactly the same material and Stagnation and water heating test. During the tests, it dimensions was also fabricated. The attached fins on the absorber of load standard fluid temperature only which makes plate increase its temperature by radiation absorption it simple and conforms to the main objective of this due to different multiple reflections.

The maximum air work. The reduction of heating period was 18 analysis was limited to only two types of cooker i. A boiling point. Air temperature in the concentrating type and box type was found to be 0. A Gravity Based Tracking System for Box Type Solar Cookers Suhail Zaki Farooqui [13] presents a one-dimensional tracking mechanism for box type solar cookers along the azimuth, which does not require any external power source and tracking energy is drawn from the gravitational potential energy stored in a spring which is attached to water container.

As water is discharged at a constant rate from the container, the spring slowly returns to its un-stretched position dragging the solar cooker along with it. The weight of the water in the container required to give Fig. Lahkar et. A single step and less time consuming test northern hemisphere, for the entire year.

Solar cooker

The proposed procedure is being proposed which enables estimation mechanism is innovative, simple, low cost, easy to of COR and consequently performance comparison handle and almost maintenance free. Result indicates between different cooker types. COR is defined as the that the optimum length of the booster mirror is equal ratio of the optical efficiency—concentration ratio to twice the width of the cooker box.

COR appears to be similar to F1 loaded Results are be noted here — Firstly, it has been derived analytically averaged over five readings obtained at 9 min from the HWB equation for concentrating collectors. Experimental the holistic performance of the cooker.

Thermal test procedure for box type solar Methodology cooker. Solar Energy There are several work had done on box type [2] Nahar NM. Performance and testing of an solar cooker by using the single, double and more than improved hot box solar cooker. Energy two mirror as the reflector. There are several Covers Manage A the transparent insulating material TIM etc.

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Solar of these are not very effective to increase the Energy Testing of to manage in daily practice. Therefore economical box type solar cooker: second figure of merit work will be done in the paper by using the water F2 and its variation with load and number white glass extra clear glass of 5mm thickness as of pots. Design, development and testing solar cooker, which provide the better transmittance of a double reflector hot box solar cooker than other glass.

The whole cover is made up of double with a transparent insulation material. In this experimental work we are also [6] Abulla H. Algifri and Hussain A. Al-Towaie changing the absorber plate material by cooper, which Efficient orientation impact of reflector of provide high conductive rate between the pots and box type solar cooker on the cooker absorber plate.

In this new work the comparison will done [7] O.

Ekechukwu and N. Design between new proposed solar cooker and conventional and measured performance of a plane solar box cooker by using the two figure of merits, reflector augmented box-type solar-energy which are reliable performance factor. The hybrid cooking unit was very useful and http: The performance of this cooking unit can be controlled effectively by varying the fluid flow rate from collector to thermal storage unit and from thermal storage unit to the heat exchanger.

Modeling Equations The solar cooker can be modelled by considering all the inputs,losses and outputs. The input to the solar cooker is purely from sunlight and the electric supply will be actuated only if the solar power is not sufficient. So for normal analysis,here considering only the solar power input to the collector and the stored heat energy in PCM material as a result of this.

Also the temperature distribution of the PCM material surrounding the cooking pot is also assumed to be constant for analysis. Then a hybrid solar cooker consists of an evacuated tube collector,latent heat storage,cooking vessel,pumps and flow rate control is also simulated at the same ambient temperature conditions. The ambient temperature was set at C in both cases. Simulations were done for both for analysing their heat gain and increase in temperature.

Conventional solar cooker component models the thermal performance of a theoretical flat plate collector with no heat storage.

The entire collector array might consist of collectors connected in series and in parallel. The thermal performance of the entire collector array is decided by the number of modules in series and also the characteristics of every module.

This model provides for the theoretical analyses of a flat plate collector. Normal solar cooker characteristics are almost similar to a solar collector which is a default component available in TRNSYS. Hottel-Whillier steady-state model is employed for evaluating the thermal performance.

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The collector that has an area of 1 m2 is simulated with water as the heat transfer fluid. From Fig. In conventional system,there is no auxiliary sources of heating other than solar radiation. So the output will be purely dependent upon the availability of solar radiation and it is clear from the characteristics of conventional system of solar cooking. Figure 3: It is similar to the basic solar water heater with slight modifications including the provision for auxiliary heating and latent heat storage.

Here also water is used as the heat transfer fluid. Simulation time was set for 24hours with same input conditions for both solar cookers,conventional and hybrid. The heat gain at the cooking pot is determined by the difference in inlet and outlet temperatures.

In proposed hybrid solar cooking system,the cooking vessel temperature is maintained constant by providing auxiliary heating at the cooking pot. Figure 4: The cooking pot temperature attained is almost C in hybrid solar cooker and thus the overall efficiency can be improved. T 2,T3,T4,T5 and Tbottom are the temperatures at different locations around the pot which is surrounded by heat storage material erythyritol which has the ability to store at Whenever the actual temperature of cooking vessel falls below a fixed value,say 50 0C the auxiliary heating source Qaux will provide sufficient heat to maintain the cooking vessel temperature at 95 0C.

The hybrid solar cooker is an alternate to rectify the disadvantages of conventional solar cooker and use of maximum accessible solar radiation along with alternate sources.

Solar cooker

A hybrid cooker with PCM storage and electric heating source was able to store thermal energy in the form of latent heat and sensible heat throughout the daytime and release the same after the sunshine hours. This stored energy will maintain the cooking temperature around C, therefore, extended the period of cooking during night as well. The simulation study shows that a hybrid solar cooker can be effectively used for fast and off shine cooking purposes. Increased cooking temperature helps the food stuff to reduce the cooking time which is one of the important positive point.

As a result, the product quality is also high compared to conventional cooker which is exposed. For further improvement of the hybrid cooker, we can use nanofluids as heat transfer fluids instead of water.

Nanofluids are having very high values of thermal conductivities over water which can help the cooker efficiency to have better values. Also we can extend the cooker to work as a dryer as well if proper shading techniques are adopted. Muthusivagami, R. Velraj , R.The entire collector array might consist of collectors connected in series and in parallel. Velraj , R. The heat transfer fluid gets heated in the evacuated tube collector is used for cooking along with alternate electric heating source.

If several foods are to be cooked separately, then they are placed in different containers. Vacuum tube type cookers can heat up even in the clouds and freezing cold.

Hottel-Whillier steady-state model is employed for evaluating the thermal performance.

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