💡 Add references and sources for heat exchanger and PID controller

Author: Senja20

Plant/heat_exchnager.py

@@ -77,3 +77,10 @@ def __calculate_heat_transfer(self) -> float:
             * self.heat_transfer_area  # A
             * (self.previous_temperature - self.temperature)  # delta_T
         )
+
+
+# sources:
+# https://en.wikipedia.org/wiki/Heat_transfer_coefficient
+# https://www.geeksforgeeks.org/heat-transfer-formulas/
+# https://sciencing.com/calculate-change-temperature-2696.html
+# https://www.geeksforgeeks.org/python-os-environ-object/

controller/PIDController.py

@@ -1,12 +1,13 @@
 import random
+from os import environ
 
 import matplotlib.pyplot as plt
 from dotenv import load_dotenv
 from jax.numpy import clip
-from os import environ
 
 from controller.GeneralController import GeneralController
 
+
 class PIDController(GeneralController):
     """PID controller class"""
 
@@ -67,6 +68,7 @@ def update_params(self, grad: dict) -> None:
         Parameters update of the PID controller
         :param grad: the gradients (dict)
         :return: None
+        https://www.ibm.com/topics/gradient-descent
         """
 
         # update the parameters
@@ -82,6 +84,7 @@ def __clip_grad(self, grad: dict, clip_value: float) -> dict:
         :param grad: the gradients (dict)
         :param clip_value: the clip value (float)
         :return: the clipped gradients (dict)
+        https://neptune.ai/blog/understanding-gradient-clipping-and-how-it-can-fix-exploding-gradients-problem
         """
         grad = [
             (
@@ -114,3 +117,6 @@ def __track_params(self):
         self.track_K_p.append(self.params["K_p"])
         self.track_K_i.append(self.params["K_i"])
         self.track_K_d.append(self.params["K_d"])
+
+
+# https://softinery.com/blog/implementation-of-pid-controller-in-python/