It is proposed to install 1 WHRU module in one of the walls of the clinker rotary kiln of the facility. The temperature inside the clinker rotary kiln is about 1450 ° C, but the WHRU will take heat by conduction from the wall of the clinker rotary kiln that is around 200 ° C.


Figure 1-Installation place-Wall of the clinker rotatory kiln


Data to be considered in the design of the unit:

  • Heat source: Metallic wall of clinker rotatory kiln.
  • Working temperature: 191ºC – 213 ºC,
  • Water temperature: There is not water available.
  • Ambient temperature: 25 ºC – 50 ºC.



  • The recovery system to be installed is non-intrusive. The installation of the WHRU is based on the contact between the heat collector and the kiln wall surface.
  • The WHRU system requires a continuous air supply to cool the system. Air will be forced through 4 fans.




Figure 2 WHRU – HSCD100


  • The electronics consists of 2 parts: power electronics and sensorization.
  • To monitor the correct functioning of the prototype, 2 types of sensor nodes will be installed:
    • Type 1-Temperature Node: Th, Tc and Tsurface.
    • Type 2-Temperature and power sensing to measure the power generated by the system and the surface temperature.
  • The technology to be applied in the communication between the sensor nodes and the Gateway will be LoRa.
  • A Gateway will be installed to collect all the data sent by the sensors. The gateway will be installed close to the WHRU.
  • The Gateway will be powered from an existing electric cabinet.
  • The communication between the Gateway and the server will be via 3G/4G.
  • DAEVIS platform will be displayed for data visualization.