A huge advantage of EVs is sitting at an event (or drivein movie) in AC comfort on a hot day without an engine running.
Id like to come up with some numbers to describe the total heat generated by an ICE at idle running its AC compared to an EV. Here is a technical paper. http://www.invisaflects.com/wp-content/uploads/2016/08/vehicleair.pdf All I can understand is figure 5 and 6. Figure 6 seems to imply that cool down begins to take about 3 kW but tapers to under 200W as temperature stabilizes. But that conflicts with figure 5 that suggests the 2 PM heat gain is over 1000 W solar heat gain and 500 W lost due to ventilation. Big difference between 200 W and 1.5 kW? Anyway as a starting point, I am going to assume 1 kW cooling. Now assume that the AC requires about 500 W electrical to pump about 1 kW of heat out of the cabin. That 1 kW cooling is then exhausted outside more like 1.5 kW. Now the ICE is assumed to be generating power from an ICE and so WHAT is the amount of heat exhausted to the outside to achieve the same 1 kW of cooling? This reference shows BEV's are about 75% tank-to-wheels efficient and ICE's are about 15% for a 5 to one ratio. http://www.afteroilev.com/Pub/EFF_Tank_to_Wheel.pdf But its much worse than that. I am going to assume that running an AC compressor at Idle is not nearly as efficient as running it when the car is moving down the road and the ICE is in a more efficient range. And the compressor is mechanical and with belts. So, I am going to assume it is 50% worse at idle as electrical. So I could claim that the exhaust heat surrounding an ICE parked with the AC running is TEN times that from an EV. Anyone want to refine these assumptions and results? Bob -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20200727/6195e7c6/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
