diff --git a/CapMachine.Wpf/Services/PPCService.cs b/CapMachine.Wpf/Services/PPCService.cs
index a62726b..558a7b6 100644
--- a/CapMachine.Wpf/Services/PPCService.cs
+++ b/CapMachine.Wpf/Services/PPCService.cs
@@ -247,6 +247,7 @@ namespace CapMachine.Wpf.Services
                                 // 计算过热度：吸气压力的饱和温度
                                 double pForSat = (InhPressTag.PVModel.EngValue) * 1000.0; // MPa->kPa
                                 double teSat = 0;
+                                iErr = 0; // 确保按 ref 传入前已赋值
                                 IRefProp64.SATPdll(ref pForSat, xLoc, ref kph, ref teSat, ref DlLoc, ref DvLoc, xliqLoc, xvapLoc, ref iErr, ref herr2, ref herrLen2);
                                 if (iErr == 0)
                                     Superheat.PVModel.EngValue = InhTempTag.PVModel.EngValue - (teSat - 273.15);
@@ -333,7 +334,7 @@ namespace CapMachine.Wpf.Services
                 // 在同一把锁中执行 REFPROP 计算，保证并发安全
                 lock (_refpropLock)
                 {
-                    string herr = new string(' ', 255); long herrLen = 255;
+                    string herr = new string(' ', 255); long herrLen = 255; iErr = 0; // 确保按 ref 传入前已赋值
                     IRefProp64.SATPdll(ref p, x, ref kph, ref te, ref Dl, ref Dv, xliq, xvap, ref iErr, ref herr, ref herrLen);
 
                     if (iErr == 0)
diff --git a/CapMachine.Wpf/TagConfig/SysTags.json b/CapMachine.Wpf/TagConfig/SysTags.json
index 607b7fb..fcd3d7d 100644
--- a/CapMachine.Wpf/TagConfig/SysTags.json
+++ b/CapMachine.Wpf/TagConfig/SysTags.json
@@ -1155,6 +1155,72 @@
       "Block": "PV",
       "BlockIndex": 102
     }
+  },
+  {
+    "Id": 530,
+    "Name": "干度[%]",
+    "NameNoUnit": "干度",
+    "EnName": "Dryness",
+    "Group": "计算",
+    "MinValue": 0,
+    "MaxValue": 10000,
+    "IsMeter": false,
+    "DecimalPoint": 2,
+    "Precision": 1,
+    "Unit": "%",
+    "DataType": "Short",
+    "RWInfo": "PLCRead",
+    "PVModel": {
+      "Address": "VW15104",
+      "EngValue": 0,
+      "EngValueStr": "",
+      "Block": "PV",
+      "BlockIndex": 104
+    }
+  },
+  {
+    "Id": 540,
+    "Name": "过冷度[K]",
+    "NameNoUnit": "过冷度",
+    "EnName": "Subcooling",
+    "Group": "计算",
+    "MinValue": 0,
+    "MaxValue": 10000,
+    "IsMeter": false,
+    "DecimalPoint": 1,
+    "Precision": 1,
+    "Unit": "K",
+    "DataType": "Short",
+    "RWInfo": "PLCRead",
+    "PVModel": {
+      "Address": "VW15106",
+      "EngValue": 0,
+      "EngValueStr": "",
+      "Block": "PV",
+      "BlockIndex": 106
+    }
+  },
+  {
+    "Id": 550,
+    "Name": "过热度[K]",
+    "NameNoUnit": "过热度",
+    "EnName": "Superheat",
+    "Group": "计算",
+    "MinValue": 0,
+    "MaxValue": 10000,
+    "IsMeter": false,
+    "DecimalPoint": 1,
+    "Precision": 1,
+    "Unit": "K",
+    "DataType": "Short",
+    "RWInfo": "PLCRead",
+    "PVModel": {
+      "Address": "VW15108",
+      "EngValue": 0,
+      "EngValueStr": "",
+      "Block": "PV",
+      "BlockIndex": 108
+    }
   }
 ]
   
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