Results 14 to 19 of 19
07-01-2012, 04:17 PM #14
LOL- more than funny boys- I just submitted by application prior to my last two posts.
07-01-2012, 04:33 PM #15
This method contradicts the basic definition of the evaporator TD...ie, TD = (Tbox - Tevap).
What I say is the mathematics of the TD rule will hold true, even in reverse. Rearrange the formula, solving for the box temp...Tbox = Tevap + TD
Ask your journeyman how evaporator superheat fits into this picture...specifically.
07-01-2012, 04:56 PM #16
Icemeister, I completely agree that the definition of evaporator as well as TD is basic and clear- air on and air off, as the kiwis like to put it. The 10*F isn't part of the calculation for deriving TD, it's part of the calculation in going from suction line pressure (or equivalent temperature) to box temp- temp of gas in the suction line, plus the TD of the evap, plus the 10* added by the txv. Im failing to see how the 10* superheat added by the txv is unnecesary in calculating the box temp, when the suction line pressure/temperature AFTER the evaporator has had the TXV's superheat added to it........
07-01-2012, 05:02 PM #17
Another way of explaining his theory of it would be to say that the pressure temperature relationship at the outlet of the evaporator is NOT a fully saturated vapor condition- it's 10*F superheated because of the txv and therefore when working backwards to determine the box temp that superheat must be factored in.
07-01-2012, 05:07 PM #18
When you read a pressure on your suction gauge and correlate that to a saturated temperature, does that saturated temperature from your gauge not represent the saturated temperature of the refrigerant in the evaporator?
07-01-2012, 05:12 PM #19