From 4b4da6c330dd1ebbb78faa6e109506d3d5a0d925 Mon Sep 17 00:00:00 2001
From: rraustad <rraustad@fsec.ucf.edu>
Date: Thu, 22 Aug 2024 22:27:52 -0400
Subject: [PATCH] log to log1p to see what diffs look like

---
 src/EnergyPlus/ConvectionCoefficients.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/EnergyPlus/ConvectionCoefficients.cc b/src/EnergyPlus/ConvectionCoefficients.cc
index d4b28755744..a03524cbf4e 100644
--- a/src/EnergyPlus/ConvectionCoefficients.cc
+++ b/src/EnergyPlus/ConvectionCoefficients.cc
@@ -6299,7 +6299,7 @@ Real64 CalcClearRoof(EnergyPlusData &state,
 
     Real64 Rf = RoughnessMultiplier[(int)RoughnessIndex];
     if (Rex > 0.1) { // avoid zero and crazy small denominators
-        Real64 tmp = std::log(1.0 + GrLn / pow_2(Rex));
+        Real64 tmp = std::log1p(GrLn / pow_2(Rex));
         eta = tmp / (1.0 + tmp);
     } else {
         eta = 1.0; // forced convection gone because no wind