Modeling of Phase Change within a Wax Element Thermostat Embedded in an Automotive Cooling System

Srinivasan, Chiranth; Zhang, Chonglin; Gao, Haiyang; Wang, De Ming; Slike, Jody

doi:10.4271/2017-01-0131

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…When the wax element is heated, the paraffin wax phase changes from solid to liquid. This condition causes the wax volume expansion to push the pin and the force generated will be used to push the spring and open the thermostat valve [13]. The thermostat used for this study has the characteristics where the expansion area of solid wax occurs in the temperature range of 70 o C to 79 o C, for the expansion area of solid-liquid wax in the temperature range 79 o C to 82 o C, and the expansion area of liquid wax in the temperature range 82 o C and above.…”

Section: Resultsmentioning

confidence: 99%

Monitoring of Thermostat Performance In Heavy Equipment Diesel Engine Cooling System Using An Ultrasonic Flow Meter

Haryadi¹,

Hendriana

Nasution

et al. 2020

CMEI

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Heavy equipment uses diesel engines as the main power source. Common problem in diesel engines is engine overheat condition and the cause of this problem can come from thermostat failure. Diagnosis of the thermostat when problem occurs in the diesel engine cooling system requires a long time. This study aims to determine the condition of the coolant flow and monitor thermostat performance while engine is running so thermostat failure can be detected earlier. In this study, an ultrasonic flow meter to measure coolant flow rate in the diesel engine cooling system was developed and the measurement is displayed for monitoring the condition of thermostat. The monitoring system has been installed and the results showed significant relationship between the coolant flow rate and the performance of the thermostat. This monitoring system can show that when the thermostat is in normal condition and when the coolant temperature reaches 80oC, it is detected that the coolant flow rate from the engine block to the radiator increases significantly.

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Section: Resultsmentioning

confidence: 99%

Monitoring of Thermostat Performance In Heavy Equipment Diesel Engine Cooling System Using An Ultrasonic Flow Meter

Haryadi¹,

Hendriana

Nasution

et al. 2020

CMEI

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“…Various researchers focused on the effect of thermostat performance with paraffin actuators on engine cooling systems where the circuit design and thermostat design are investigated [17][18][19][20]. The paraffin actuator for car thermostats are working particularly between 30 and 120 C. The working temperature range of e-vehicle battery cooling circuits is at around 30 C [6], the conventional internal combustion engine cooling circuits is at around 80 C [21] and also heated thermostat cooling circuits is around 120 C [22].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Paraffin/polyacrylonitrile hybrid nanofibers for thermal hysteresis enhancement of paraffin actuators

Kutlu

Eren

Aykut

2021

Journal of Industrial Textiles

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Fast and facile one-step preparation of paraffin/polyacrylonitrile hybrid nanofibers via single needle (uniaxial) electrospinning system was studied. As-spun paraffin/polyacrylonitrile nanofibers were used for thermal hysteresis enhancement of paraffin actuators. Solid paraffin with the melting point of 32, 58, 89 and 114°C were employed for the preparation of the paraffin/polyacrylonitrile nanofibers. Differential scanning calorimetry measurements revealed that the melting point of the paraffin in paraffin/polyacrylonitrile hybrid nanofiber was clearly detectable and the melting entalpy coming from the paraffin part gradually increased from 9.6 to 101.5 J/g with the increase in the melting points of the added same amount of paraffins in paraffin/polyacrylonitrile nanofibers. When both calorimetric and weight loss measurements were considered, the paraffin which has the melting point of 32°C was found to be suitable to produce hybrid nanofibers paraffin actuator. Therefore, this hybrid nanofiber was selected for the application in paraffin actuators for e-vehicle battery cooling systems where the battery temperature must be kept between 15 and 35°C. Paraffin compound of the paraffin actuators was prepared with a mixture of pure paraffin and paraffin/polyacrylonitrile nanofiber with the wt.% of 2.5, 5, 7.5 and 10. In the hysteresis measurements, the hysteresis value at 3 mm stroke was successfully enhanced as 1.7, 3.4, 11.9 and 15.3% sequentially for the samples produced with the above ratios. Beyond hysteresis enhancement, the phenomena of thermal percolation threshold effect and thermal conductivity contrast ratio effect in nano scale were emprically exposed on opening and closing behavior of the paraffin actuator.

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Engineering Applications of Multi-Dimensional CFD Analysis of Lubrication System

Srinivasan

Pasunurthi

Tawar³

et al. 2020

SAE Technical Paper Series

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Modeling of Phase Change within a Wax Element Thermostat Embedded in an Automotive Cooling System

Cited by 9 publications

References 6 publications

Monitoring of Thermostat Performance In Heavy Equipment Diesel Engine Cooling System Using An Ultrasonic Flow Meter

Monitoring of Thermostat Performance In Heavy Equipment Diesel Engine Cooling System Using An Ultrasonic Flow Meter

Paraffin/polyacrylonitrile hybrid nanofibers for thermal hysteresis enhancement of paraffin actuators

Engineering Applications of Multi-Dimensional CFD Analysis of Lubrication System

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