Ffe Posted March 13, 2021 at 12:22 PM Report Share Posted March 13, 2021 at 12:22 PM It's occurred to me that a lot of EVs use resistive heating for their heat like the Fusion. A reversing valve for their AC system couldn't cost that much/add that much weight. Why aren't they designed to use their ACs as a heatpump? They could do a little heat exchanger with the gas engine coolant too perhaps. It wouldn't need to be very big. OR perhaps just mill a channel through the engine casing intended for refridgerant plus one more valve to switch it through the engine when it wants heat, or through the AC evaporator when it's trying to get rid of heat. Quote Link to comment Share on other sites More sharing options...
murphy Posted March 13, 2021 at 01:31 PM Report Share Posted March 13, 2021 at 01:31 PM 1 hour ago, Ffe said: It's occurred to me that a lot of EVs use resistive heating for their heat like the Fusion. A reversing valve for their AC system couldn't cost that much/add that much weight. Why aren't they designed to use their ACs as a heatpump? They could do a little heat exchanger with the gas engine coolant too perhaps. It wouldn't need to be very big. OR perhaps just mill a channel through the engine casing intended for refridgerant plus one more valve to switch it through the engine when it wants heat, or through the AC evaporator when it's trying to get rid of heat. There is no heat in my engine. I hardly ever use it. When the engine is running heat is taken from the water jacket to heat the cabin just like every other car. The resistance heater is only for full electric heat. BEVs don't have an engine. Quote Link to comment Share on other sites More sharing options...
Ffe Posted March 13, 2021 at 02:44 PM Author Report Share Posted March 13, 2021 at 02:44 PM Engine or not, isn't a heatpump like 3 to 4x more efficient than resistive electric heat? My neighborhood does not have natural gas service, and my home has an electric furnace plus a heatpump. I literally put a switch on the electric furnace to disable it fully, and the Feb 2021 blizzard was the first time I switched it on in like 4 years because it's so much more expensive than heatpump. Quote Link to comment Share on other sites More sharing options...
jsamp Posted March 16, 2021 at 01:15 AM Report Share Posted March 16, 2021 at 01:15 AM (edited) "Why aren't they designed to use their ACs as a heatpump?" In 4 words: Ford is too cheap. They didn't even put one on the Mach E. Edited March 16, 2021 at 01:18 AM by jsamp jj2me 1 Quote Link to comment Share on other sites More sharing options...
Ffe Posted March 16, 2021 at 01:46 AM Author Report Share Posted March 16, 2021 at 01:46 AM Dang! Which EVs do have a heat pump? Quote Link to comment Share on other sites More sharing options...
jsamp Posted March 17, 2021 at 05:12 AM Report Share Posted March 17, 2021 at 05:12 AM Recent list: Nissan Leaf Hyundai Kona / Kia Niro Tesla Y & 3 Chevrolet Bolt Audi E-Tron Volkswagen e-Golf Jaguar I-Pace BMW i3 Mini Cooper SE Plus the Prius Prime and Rav4 Prime PHEVs source: https://enrg.io/electric-cars-heat-pumps/ jj2me 1 Quote Link to comment Share on other sites More sharing options...
JATR4 Posted March 20, 2021 at 09:58 PM Report Share Posted March 20, 2021 at 09:58 PM My new 2021 Volvo XC40 Recharge has a heat pump. jj2me 1 Quote Link to comment Share on other sites More sharing options...
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