| Analysis of hybrid operating mode for coolant source heat pump system applied to a fuel cell electric vehicle Hoseong Lee1; 1KOREA AUTOMOTIVE TECHNOLOGY INSTITUTE, Chonan, South Korea; PAPER: 415/Energy/Regular (Oral) SCHEDULED: 12:45/Tue. 29 Nov. 2022/Game ABSTRACT: An efficient heating system for the cabin of electric-driven vehicles (xEVs) is required to minimize the reduction in the driving range. However, studies regarding heat pumps that use waste heat from fuel cell stack, electric devices and battery in xEVs are limited. In this study, the heating performance of a coolant-source heat pump using waste heat in xEVs is investigated by varying coolant temperature, and coolant volumetric flow rate to have enough capacity in severe ambient conditions. A novel triple-fluid heat exchanger is introduced to recover waste heat from the fuel cell stack with high level and electric devices with relatively low level at different temperatures. The heating performance of the coolant-source heat pumps using the electric device coolant and the stack coolant shows different characteristics owing to the different temperature levels of the coolants. This study suggests optimum heat pump system of xEVs with respect to driving range characteristics under severe ambient conditions. References: [1] Kim SC, Won JP, Park YS, Lim TW, Kim MS. Performance evaluation of a stack cooling system using CO2 air conditioner in fuel cell vehicles. Int J Refrig 2009;32:70–77. [2] Takahisa S, Katsuya I. Air conditioning system for electric vehicle. Proceedings of SAE International Congress & Exposition;1996:960688. [3] Al-Alawi BM, Bradley TH. Total cost of ownership, payback, and consumer preference modeling of plug-in hybrid electric vehicles. Appl Energy 2013;103:488–506. [4] Brouwer AS, Kuramochi T, Broek M, Faaij A. Fulfilling the electricity demand of electric vehicles in the long term future: An evaluation of centralized and decentralized power supply systems. Appl Energy 2013;107:33–51. [5] Lee HS, Lee MY. Cooling performance characteristics on mobile air-conditioning system for hybrid electric vehicles. Adv Mech Eng 2013:1–9. |
