Clarify transition rules to new PLF(PLR) curve.

NREL · Jul 25, 2023 · deb0b45 · deb0b45
1 parent 6f3b4b8
commit deb0b45
Showing 1 changed file with 6 additions and 5 deletions.
diff --git a/src/Transition/InputRulesFiles/Rules23-1-0-to-23-2-0.md b/src/Transition/InputRulesFiles/Rules23-1-0-to-23-2-0.md
@@ -4,13 +4,14 @@ Input Changes version 23.1.0 to 23.2.0
 This file documents the structural changes on the input of EnergyPlus that could affect interfaces, etc.
 This was previously an Excel workbook that made for very difficult version control, especially during busy times around code freezes.
 
-# Part Load Fraction Correlation
+# Part Load Fraction Correlations
 
-There are a few object changes below that are related to the cycling and latent degradation inputs.
-Some of these require a calculation to get the new input.
-The correlation being applied is: 
+This changes brings greater consistency in how part load performance is characterized across coils. These coils now use a traditional
+curve fit to characterize part load fraction as a function of part load ratio. The previous approach was more theoretical based on inputs
+shared with the latent degradation model. An approximate conversion from the previous inputs to a linear part load fraction curve is described
+below:
 
-(1 - Cd) + Cd * PLR
+PLF(PLF) = (1 - Cd) + Cd * PLR
 
 Thus calculating the new coefficient is: