Wire BPHX channel pressure drop on both sides with selectable correlations.

Replace isobaric 4-port closures with SimplifiedChannel (default) and Martin1996 DP models so z_dp and UI dp_correlation actually affect the Newton solve.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/web/src/lib/componentMeta.test.ts

@@ -206,8 +206,14 @@ describe("COMPONENTS catalogue integrity", () => {
           "channel_spacing_mm",
           "chevron_angle_deg",
           "correlation",
+          "dp_correlation",
         ]),
       );
+      const dp = COMPONENT_BY_TYPE[type].params.find((p) => p.key === "dp_correlation");
+      expect(dp?.options?.map((o) => o.value)).toEqual([
+        "SimplifiedChannel",
+        "Martin1996",
+      ]);
     }
   });
 

apps/web/src/lib/componentMeta.ts

@@ -1076,6 +1076,19 @@ export const COMPONENTS: ComponentMeta[] = [
           { value: "Shah2021", label: "Shah 2021" },
         ],
       },
+      {
+        key: "dp_correlation",
+        label: "Pressure-drop correlation",
+        kind: "string",
+        default: "SimplifiedChannel",
+        section: "Pressure drop",
+        description:
+          "Channel friction on both hot and cold sides (independent of HTC). Default SimplifiedChannel; Martin1996 uses chevron angle.",
+        options: [
+          { value: "SimplifiedChannel", label: "Simplified channel (default)" },
+          { value: "Martin1996", label: "Martin 1996 (chevron)" },
+        ],
+      },
       { key: "ua", label: "UA override", kind: "number", unit: "W/K", section: "Calibration", min: 0.0, advanced: true },
       {
         key: "calib_sst_c",
@@ -1163,6 +1176,19 @@ export const COMPONENTS: ComponentMeta[] = [
           { value: "Shah2021", label: "Shah 2021" },
         ],
       },
+      {
+        key: "dp_correlation",
+        label: "Pressure-drop correlation",
+        kind: "string",
+        default: "SimplifiedChannel",
+        section: "Pressure drop",
+        description:
+          "Channel friction on both hot and cold sides (independent of HTC). Default SimplifiedChannel; Martin1996 uses chevron angle.",
+        options: [
+          { value: "SimplifiedChannel", label: "Simplified channel (default)" },
+          { value: "Martin1996", label: "Martin 1996 (chevron)" },
+        ],
+      },
       { key: "ua", label: "UA override", kind: "number", unit: "W/K", section: "Calibration", min: 0.0, advanced: true },
       {
         key: "calib_sdt_c",

apps/web/src/lib/configBuilder.ts

@@ -141,6 +141,7 @@ const PARAM_ALIASES: Record<string, string[]> = {
   rh: ["relative_humidity"],
   p_set_bar: ["pressure_bar"],
   p_back_bar: ["pressure_bar"],
+  dp_correlation: ["DpCorrelation", "dpCorrelation"],
 };
 
 function getParam(