The novelty-designed adaptive heat exchanger (AHE) for heat dissipation from the hydraulic system to ambient air has been experimentally investigated. The heated hydraulic oil circulated in rubber hydraulic pipes as working fluid. The heat flow for AHE mounted in the hydraulic circuit was compared with the condition without the AHE. In addition, the contact surfaces of the AHE were coated with a copper-based thermal conductive paste for heat transfer enhancement research. The installation of the AHE in the hydraulic system caused an increase in heat flow by an average of 19.79% compared to the system without AHE, at an oil flow rate of 0.043 kg/s. The AHE with the copper-based thermal conductive paste achieved higher heat flow by an average of 24.93% and 20.49% compared to the circuit without AHE and with AHE, respectively. The installation of the AHE, and AHE with thermal conductive paste, into the hydraulic circuit caused an increase in differences of surface temperatures up to 8.1 °C and 8.3 °C compared to the hydraulic system without AHE. The hydraulic system with AHE achieved 1.3 times and 2.2 times higher the overall heat transfer coefficient compared to the AHE with thermal conductive paste and the system without AHE, respectively. The finned AHE is usable for additional cooling of working fluid (oil, coolant, fuel) in various machines and equipment without the necessity of interrupting the pipelines. Adaptability of the AHE allows it to be mounted on flexible hoses in the required location with the possibility of changing the number of heat exchange segments.
The effect of car cooler mileage and coolant mileage on cooler thermal performance was experimentally investigated. The water–ethylene-glycol-based coolant with mileages of 0 km, 50,000 km, and 100,000 km was circulated in new and used car coolers with mileages of 0 km and 100,000 km, respectively. The heating and cooling time of coolants, heat transfer rate, and thermal performance were evaluated. The coolant with a mileage of 0 km in the new cooler achieved a heating time of 41 min and 30 s, which is 8 min less time compared to the coolant with mileage of 100,000 km in the used cooler. When the operating temperature was reached earlier, the engine ran more efficiently and consumed less fuel. The coolant with 0 km mileage in the new cooler achieved a cooling time of 4 min and 30 s, which is 3 min and 30 s less time compared to the coolant with 50,000 km mileage in the new cooler. The new coolant in the new cooler achieved the shortest heating time and cooling time and the highest thermal performance (η = 0.79). The used cooler with the new coolant only achieved a one-time decrease compared to the new cooler and new coolant. The coolant with 50,000 km and 100,000 km mileage for the new cooler and used cooler reached a drop of 1.01 to 1.02 times compared to the new cooler. Coolant and coolers with higher mileage have no significant effect on the thermal performance of the cooler and the correct cooling function of the car engine.
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