Does electric engine produce heat ?

[topspeed100]

I am designing a future 64 seater solarpowered ( bit human too ) passenger plane with initial take off with precharged batteries..in to pretty high operating altitude..perhaps 45 000 ft...now I wonder if I circulate the cooling air from the engines via passenger space floor..and back...will it heat the cabin at all..are they how hot ? I am actually circulating the air that already went through passenger space in a tube around the space..is there any use..is a heater better ?

I intent to build a smaller flying model..where I could test all these systems...yet 20+ meters in span.

 

[Himat]

 

[davedpilot]

 

[Hot Wings]

 

[Dan Thomas]

 

[highspeed]

 

[davedpilot]

 

[topspeed100]

 

[ultralajt]

 

[topspeed100]

 

[ultralajt]

 

[Marc Bourget]

 

[litespeed]

 

[litespeed]

 

[autoreply]

 

[Dan Thomas]

 

[stevel]

 

[litespeed]

 

[Dan Thomas]

 

[stevel]