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Jan 22, 2020 at 15:50 comment added Bob D @ChetMiller When I said "the only way to lower and raise the system temperature without transferring heat with additional reservoirs..." with the emphasis on "additional" I was alluding to the need for intermediate temperatures. But I can elaborate.
Jan 22, 2020 at 14:56 comment added Chet Miller No; something like to get the working fluid between the two temperatures, the fluid has to pass through intermediate temperatures. If the path is not adiabatic, heat transfer will be occurring at these intermediate temperatures using reservoirs at these intermediate temperatures, which is contrary to the use of only two reservoirs.
Jan 22, 2020 at 14:39 comment added Bob D @ChetMiller Are you thinking details of the adiabatic processes for ideal gas?
Jan 22, 2020 at 14:02 comment added Chet Miller I think you should add a little more detail on the 2nd bullet.
Jan 22, 2020 at 14:00 history edited Bob D CC BY-SA 4.0
added 2 characters in body
Jan 22, 2020 at 13:47 history answered Bob D CC BY-SA 4.0