added coolprop

src/coolprop-node/test/R744.C..test.js

@@ -0,0 +1,55 @@
+const coolprop = require('../src/index.js');
+
+describe('R744 (CO2) Real Values', () => {
+    it('should calculate superheat correctly at -40°C saturation', async () => {
+        const result = await coolprop.calculateSuperheat({
+            temperature: -35,  // 5K above saturation temp of -40°C
+            pressure: 9.03,    // saturation pressure at -40°C (from chart)
+            refrigerant: 'R744',
+            tempUnit: 'C',
+            pressureUnit: 'bar'
+        });
+
+        expect(result.type).toBe('success');
+        expect(Math.abs(result.superheat - 5)).toBeLessThan(0.1); // Should be ~5K superheat
+    });
+
+    it('should calculate subcooling correctly at 0°C saturation', async () => {
+        const result = await coolprop.calculateSubcooling({
+            temperature: -5,    // 5K below saturation temp of 0°C
+            pressure: 33.84,    // saturation pressure at 0°C (from chart)
+            refrigerant: 'R744',
+            tempUnit: 'C',
+            pressureUnit: 'bar'
+        });
+        
+        expect(result.type).toBe('success');
+        expect(Math.abs(result.subcooling - 5)).toBeLessThan(0.1); // Should be ~5K subcooling
+    });
+
+    it('should calculate zero superheat at saturation point', async () => {
+        const result = await coolprop.calculateSuperheat({
+            temperature: -20,   // Exact saturation temperature
+            pressure: 18.68,    // Matching saturation pressure from chart
+            refrigerant: 'R744',
+            tempUnit: 'C',
+            pressureUnit: 'bar'
+        });
+        
+        expect(result.type).toBe('success');
+        expect(Math.abs(result.superheat)).toBeLessThan(0.1); // Should be ~0K superheat
+    });
+
+    it('should calculate zero subcooling at saturation point', async () => {
+        const result = await coolprop.calculateSubcooling({
+            temperature: 10,    // Exact saturation temperature
+            pressure: 44.01,    // Matching saturation pressure from chart
+            refrigerant: 'R744',
+            tempUnit: 'C',
+            pressureUnit: 'bar'
+        });
+        
+        expect(result.type).toBe('success');
+        expect(Math.abs(result.subcooling)).toBeLessThan(0.1); // Should be ~0K subcooling
+    });
+});