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5UTILIZATION OF ALTERNATIVE ENERGY FOR FUEL ECONOMY ENHANCEMENT IN PERISHABLE PRODUCTS' TRANSPORTATION
Tursunov O.A.
Tursunov Oybek Abduhalim ugli - Assistant DEPARTMENT OF AUTOMOTIVE ENGINEERING, ANDIJAN MACHINE-BUILDING INSTITUTE, ANDIJAN, REPUBLIC OF UZBEKISTAN
Abstract: most perishable food products are transported with refrigerated trucks. It requires additional energy costs due to the running the refrigeration system. In this article, the technical and economical properties of transport applications of solar energy were analyzed. Some results and the design of proposed additional parts were given.
Keywords: solar energy, solar panel, refrigeration, isothermal trucks.
Introduction.
As known, Uzbekistan has high potential and excellent quality in production of agricultural products so, the share of agricultural food products in annual exports is considerable. Since most of agricultural products that are exported are perishable, they need cooling when transporting. This, in turn, will increase the cost of transportation and eventually increase the cost of production.
The aim of the study is to reduce a cost of transportation of perishable products by implementing a new construction for refrigerated trucks that use solar energy in the refrigeration system.
Methodology.
The new construction was designed in order to operate the refrigeration unit with electric motor which is powered by solar panels set on the roof of the truck. According to the new design, the refrigeration unit will be powered by thin elastic solar panels (PV) set on the roof (calculated 10.3 m2), an additional spare battery stores the energy generated by PV panels and the refrigeration unit will be driven by stored energy when to reduce the fuel consumption. The calculations shows that 16 elastic PV panels with a capacity of 100 W and a weight of 1.35 kg with each size 1134x544x3 mm are needed to cover all surface of a roof of the truck [1]. On the basis of the calculations, the battery with an energy storage capacity of 600 A/h, 24V Li-ion was selected and placed two in the lower part of the body on board.
The existing refrigerator system of the car is equipped with a engine-driven compressor. Thus, it requires an additional electric motor to operate it with electricity stored in the buttery. Depending on the maximum power required for the compressor, an electric motor was selected with characteristic: 24V; 4000W; 3000rpm. An electric motor is connected to the compressor via a belt and electromagnetic pulley.
Findings.
The energy consumption for refrigeration of different type of perishable products varies for fruits, meat products and milk products. As calculated for declining the temperature of 3 different type of products (3000 kg of each) for 20°C with the formula (1), results was as follows [2]:
Q=CM(T1-T2) (1)
Fruit - 219600 kJ (61 kW);
Meat and meat products - 168000kJ (46.6 kWh);
Milk and milk products - 180000 kJ (50 kWh);
Considering the optimal specific fuel consumption of chosen truck "Isuzu NQR 71 PL" is 123.0 gr/kWh, the additional fuel consumption for refrigerating the total load will be below respectively:
Fruit - 7503g ~ 7.5 kg;
Meat and meat products - 5731g ~ 5.7 kg;
Milk and milk products - 6150g ~ 6.1 kg;
Finally, as a result of using stored 28.8 kW power in two additional batteries (2x600Ax24V=28.8 kW), total 3.5 kg ~ 4.11 L fuel will be economized per full charge of butteries. Recharging time of batteries by PV panels depends on a location and day or night operation of the car.
Conclusion.
The conclusion is that, according to the theoretical calculations, this system will be able to operate the refrigerator independently 4 hours when the buttery is fully charged or about 8-10 hours when operated by regimes. This will certainly have a positive impact on fuel consumption.
References
1. Tursunov O. Solar Assisted Refrigeration System for Transport Applications. Master thesis. AndMI, 2017.
2. Karimov B. Design of an Electrically Driven Refrigeration System with Solar Energy. Bachelor thesis. AndMI, 2018.
