From deb0b4578949aac5fa70152d87eced30ec4a9012 Mon Sep 17 00:00:00 2001 From: Neal Kruis Date: Tue, 25 Jul 2023 09:01:49 -0600 Subject: [PATCH] Clarify transition rules to new PLF(PLR) curve. --- .../InputRulesFiles/Rules23-1-0-to-23-2-0.md | 11 ++++++----- 1 file changed, 6 insertions(+), 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 index 872fc2d94d7..58f3045ce45 100644 --- 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: