A thermal radiator in an automobile has the function of preventing an engine from overheating and regulating engine temperature. Heat pipes are heat transfer devices with high thermal conductivity and with their use the radiator's frontal area can be made more compact or the heat transfer capacity of the radiator can be increased. The heat pipe radiator is designed to operate at conditions similar to that of a conventional radiator. Theoretical thermal calculations were carried out for verifying any improvement in its thermohydraulic performance. It was observed that for the same size of radiator the effective frontal area reduced by 37.17% and capacity reduced by 14.82%.

The heat generated in an automobile engine needs to be extracted and dissipated for its efficient working. The objective of this experiment was to improve the thermohydraulic performance of the radiator which can be achieved by using nanofluids as engine coolant for increasing the heat rejection capacity on the coolant side. The present study investigates the performance of MWCNT-water nanofluid at different temperatures (50, 60, and 70 o C). The results indicate that maximum increase in thermal capacity was observed to be 32% at 50 o C (0.2% particle concentration).

Gravity assisted heat pipes are heat transfer devices that are extensively used for heat recovery and cooling applications. This paper presents a theoretical approach to the design of gravity assisted heat pipes. The variation of the heat transport limits is plotted for different wick structures, materials, working fluids in the heat pipe and heat pipe dimensions. To obtain the best case for heat transfer in gravity assisted situations, the lowest heat transport limit is compared for different wick structures of the heat pipe.

In this project work the design and construction of a model of automatic braking system for vehicles in hill station is to be developed. The mechanism has been developed to stop the vehicle from rolling back word when the vehicle is moving in the hill roads. This construction made of two phases in a first deigns of ratchet and pawl mechanism, frame, shaft, etc. is done and in second sensor selection and interference is done. Ratchet and pawl mechanism has been fabricated and assembly with sensor interface is tested. The proposed mechanism is to reverse break using ratchet gear. By reverse locking the differential is disengaged from the axle. Thus the power is directly transmitted to the axle and hence to the wheels. This will considerably reduce the power loss in some occasions when unwanted loss is happening due to the transmission if power from the shaft to the ratchet gear and then to the axle and hence to the wheels. So in mechanism the unwanted power loss in the due course of transmission through the gear wheel is reduced.

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