Automotive Science and Engineering

en Experimental evaluation of transient heat transfer performance of an automotive condenser designed for R744 refrigerant مدیریت حرارتی Thermal management پژوهشي Research As alternatives for future refrigeration, heat pumping, air conditioning, or even power generation plants are emerging due to the regulatory changes, R744 (carbon dioxide) is considered as a serious alternative to be the successor of other Halogenated Hydrocarbons Refrigerants (HHR) for the AC-system of vehicles. This paper investigates the heat transfer performance of R744 through a subcritical vehicular condenser, designed and manufactured for the first product based on NP01 platform (Iranian vehicle), at different operating conditions in terms of refrigerant mass flow rate and wind velocity. The experiments carried out in order to investigate the effect of mass flow rate, the R744 inlet temperature was observed to have sudden fluctuations. At the condenser outlet, for the smallest mass flow rate, the least variation of temperature was observed. It was also found out that for higher air velocities through the condenser, the stabilized temperature after the condenser was lower. The results show that the performance of the designed and manufactured automotive condenser based on R744 refrigerant is acceptable which makes it a suitable candidate for automotive applications. As alternatives for future refrigeration, heat pumping, air conditioning, or even power generation plants are emerging due to the regulatory changes, R744 (carbon dioxide) is considered as a serious alternative to be the successor of other Halogenated Hydrocarbons Refrigerants (HHR) for the AC-system of vehicles. This paper investigates the heat transfer performance of R744 through a subcritical vehicular condenser, designed and manufactured for the first product based on NP01 platform (Iranian vehicle), at different operating conditions in terms of refrigerant mass flow rate and wind velocity. The experiments carried out in order to investigate the effect of mass flow rate, the R744 inlet temperature was observed to have sudden fluctuations. At the condenser outlet, for the smallest mass flow rate, the least variation of temperature was observed. It was also found out that for higher air velocities through the condenser, the stabilized temperature after the condenser was lower. The results show that the performance of the designed and manufactured automotive condenser based on R744 refrigerant is acceptable which makes it a suitable candidate for automotive applications.   automotive, condenser, R744, HVAC, high pressure, wind tunnel 4017 4025 http://ase.iust.ac.ir/browse.php?a_code=A-10-327-5&slc_lang=en&sid=1 Sasan Zanganeh 180031947532846003998 180031947532846003998 Yes School of Automotive Engineering, Iran University of Science and Technology, Tehran Mohammad Hassan Shojaeefard mhshf@iust.ac.ir 180031947532846003999 180031947532846003999 No School of Automotive Engineering, Iran University of Science and Technology, Tehran Gholam Reza Molaeimanesh 180031947532846004000 180031947532846004000 No School of Automotive Engineering, Iran University of Science and Technology, Tehran Masoud Dahmardeh 180031947532846004001 180031947532846004001 No School of Automotive Engineering, Iran University of Science & Technology, Tehran, Iran Mahdi Mohammadi Aghdash 180031947532846004002 180031947532846004002 No School of Automotive Engineering, Iran University of Science & Technology, Tehran, Iran