feat: legacy effective temperature

ladybug_comfort/et.py

@@ -0,0 +1,41 @@
+# -*- coding: utf-8 -*-
+"""Effective temperature transitioned from legacy code of @stgeorges"""
+
+def effective_temperature(Ta, ws, rh, SR, ac):
+    # inputs: (Ta, ws, rh, SR, ac):
+    if ws <= 0.2:
+        # formula by Missenard
+        TE = Ta - 0.4*(Ta - 10)*(1-rh/100)
+    elif ws > 0.2:
+        # modified formula by Gregorczuk (WMO, 1972; Hentschel, 1987)
+        TE = 37 - ( (37-Ta)/(0.68-(0.0014*rh)+(1/(1.76+1.4*(ws**0.75)))) ) - (0.29 * Ta * (1-0.01*rh))
+
+    # Radiative-effective temperature
+    TRE = TE + ((1 - 0.01*ac)*SR) * ((0.0155 - 0.00025*TE) - (0.0043 - 0.00011*TE))
+
+    if TRE < 1:
+        effectTE = -4
+        comfortable = 0
+    elif TRE >= 1 and TE < 9:
+        effectTE = -3
+        comfortable = 0
+    elif TRE >= 9 and TE < 17:
+        effectTE = -2
+        comfortable = 0
+    elif TRE >= 17 and TE < 21:
+        effectTE = -1
+        comfortable = 0
+    elif TRE >= 21 and TE < 23:
+        effectTE = 0
+        comfortable = 1
+    elif TRE >= 23 and TE < 27:
+        effectTE = 1
+        comfortable = 0
+    elif TRE >= 27:
+        effectTE = 2
+        comfortable = 0
+
+    return TRE, effectTE, comfortable, []
+
+
+

requirements.txt

@@ -1 +1,2 @@
 ladybug-core==0.43.18
+numpy

tests/et_test.py

@@ -0,0 +1,18 @@
+# coding utf-8
+
+import pytest
+
+from ladybug_comfort.et import effective_temperature
+
+def test_effective_temperature():
+    """Test the effective_temperature function"""
+    et_obj = effective_temperature(Ta=13.7,
+                                   ws=7.8,
+                                   rh=74,
+                                   SR=104,
+                                   ac=318)
+    assert et_obj[0] == 0.07758930406978726
+    assert et_obj[1] == -4
+    assert et_obj[2] == 0
+    assert et_obj[3] == []
+