4 ms·
why not use a heat pump for heating given its >100% relative efficiency? Edit: apparently some VW models include a heat pump for this reason.[1] Edit 2: Appare
by abfan1127 6y ago
why not use a heat pump for heating given its >100% relative efficiency?
Edit: apparently some VW models include a heat pump for this reason.[1]
Edit 2: Apparently some Teslas have it too. [2]
[1] https://www.speakev.com/threads/heat-pump-yes-or- https://www.speakev.com/threads/heat-pump-yes-or-
no.16768/
[2] https://electrek.co/2020/03/13/tesla-model-y-has-a-heat-pump-for-consistent-range-in-cold-climates/ https://electrek.co/2020/03/13/tesla-model-y-has-a-heat-pump...
- X6S1x6Okd1st 6y agoWhere are you pumping the heat from?
- abfan1127 6y agooutside, just like residential heat pumps.
- emkoemko 6y agoyea but many places in winter heat pumps efficiency goes to basically a electric heater level and if works at all.
- pcdoodle 6y agoNot true. Inverter heat pumps can do 8 or more btu per watt at sub zero temps.
- nnevod 6y agoIIRC, cold climate specific (Mitsubishi Zubadan series for example) have COP of about ~2 at -20C. Even cheaper cold climate pumps do function at -30, albeit with COP barely above 1. So resistive heater should also be present, but it won't be used often.
- nnevod 6y agoIn my opinion, proper winter-ready BEV should have a heat pump for heating the interior and battery, battery insulation to reduce uncontrollable loss of heat from battery, rotary heat exchanger to further save on heating ventilation air and double-pane windows to reduce losses from interior. Double-pane windows would increase weight by about 5%, while decreasing losses through windows about 5x, iirc.