1. Institute of Engineering Thermodynamics, University of Siegen, 57076 Siegen, Germany
2. Center for Sensor Systems (ZESS), University of Siegen, 57076 Siegen, Germany
3. Department of Chemical Engineering, Dedan Kimathi University of Technology, Nyeri 10143, Kenya
4. Department of Mechanical Engineering, Dedan Kimathi University of Technology, Nyeri 10143, Kenya