From 7c58340c9d0c8c9bed70fa69e1a65ffbd46d4eb1 Mon Sep 17 00:00:00 2001
From: Chris Mackey <chris@ladybug.tools>
Date: Mon, 1 Aug 2022 14:17:20 -0400
Subject: [PATCH] fix(shw): Ensure hot water plant does not get created when
 all load is 0

---
 lib/to_openstudio/geometry/room.rb | 10 ++++++----
 lib/to_openstudio/model.rb         | 10 ++++++----
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/lib/to_openstudio/geometry/room.rb b/lib/to_openstudio/geometry/room.rb
index c158eb7..d260e68 100644
--- a/lib/to_openstudio/geometry/room.rb
+++ b/lib/to_openstudio/geometry/room.rb
@@ -312,10 +312,12 @@ def to_openstudio(openstudio_model)
 
         # assign service hot water if it exists
         if @hash[:properties][:energy][:service_hot_water]
-          shw_space = ServiceHotWaterAbridged.new(@hash[:properties][:energy][:service_hot_water])
-          os_shw_space = shw_space.to_openstudio(
-            openstudio_model, os_space, @hash[:properties][:energy][:shw])
-          $shw_for_plant = shw_space
+          if @hash[:properties][:energy][:service_hot_water][:flow_per_area].to_f != 0
+            shw_space = ServiceHotWaterAbridged.new(@hash[:properties][:energy][:service_hot_water])
+            os_shw_space = shw_space.to_openstudio(
+              openstudio_model, os_space, @hash[:properties][:energy][:shw])
+            $shw_for_plant = shw_space
+          end
         end
 
         # assign infiltration if it exists
diff --git a/lib/to_openstudio/model.rb b/lib/to_openstudio/model.rb
index e37c9dd..f529da2 100644
--- a/lib/to_openstudio/model.rb
+++ b/lib/to_openstudio/model.rb
@@ -454,10 +454,12 @@ def create_rooms
               program_type_id = room[:properties][:energy][:program_type]
               shw_hash = $programtype_shw_hash[program_type_id]
               unless shw_hash.nil?
-                shw_object = ServiceHotWaterAbridged.new(shw_hash)
-                openstudio_shw = shw_object.to_openstudio(
-                  @openstudio_model, openstudio_room, room[:properties][:energy][:shw])
-                $shw_for_plant = shw_object
+                if shw_hash[:flow_per_area].to_f != 0
+                  shw_object = ServiceHotWaterAbridged.new(shw_hash)
+                  openstudio_shw = shw_object.to_openstudio(
+                    @openstudio_model, openstudio_room, room[:properties][:energy][:shw])
+                  $shw_for_plant = shw_object
+                end
               end
             end