A bit of a noobie question.
But can anyone explain in simple terms what governs the evaporator pressure in say a tev system.
Ie. If the load/temp is high, is it this temp that would cause the evap pressure to rise? or is it the tev opening letting in more refrigerant/pressure that would cause it to rise.
As a system on pull down seems to have a highish evap temp that comes down when the room temp is reduce.
I just cant get my head around wether it is the temp/pressure relationship that causes a higher pressure in the evaporator or the metering device letting in more refrigerant and therfore pressure.
I am a little confused as i thought it would be latent heat at evaporation and therefore no increase in temp and along constant pressure line.

Would appreciate any help.
Thanks