Postdoc project

I have received founding for a 3-year individual post doctorial project at The Danish Council for Independent Research | Technology and Production Sciences. The project is entitled: "Pulsating two-phase flow for heat transfer augmenting in heat pumps".

The project starts officially the 1st of July 2012 On this webpage I will update on the progress in the project. A brief description of the project is given below.

The objective of the project is to increase the performance of heat pumps by employing flow pulsations to the refrigerant flow inside the evaporator. Heat pumps are considered to be a substantial part of the future fossil-free energy system concerning the heat supply. The pulsating two-phase flow will increase heat transfer, which in this case will improve the performance of the most important component of heat pumps, the evaporator, which transfers the renewable heat source to be used for heating purposes. It is expected that this will increase their energy efficiency and thus reduce energy consumption and climate impact. An increase in heat transfer will improve both component and system energy efficiency as well as reduce the usage of raw materials, such as copper and aluminium.

The effect of frequency and amplitude of the flow pulsations will be investigated in this project. Moreover, we will consider the pulsating effect on the local boiling heat transfer and pressure drop along a test case evaporator tube. We will perform this project experimentally and numerically. We will generate empirical relations and software tools for prediction and numerical modelling of the evaporator and the system that will be useful for future heat pump design.

The vision is that intelligent flow pulsation will become tomorrow’s standard in evaporators, not only for residential heat pumps, but in every residential and industrial energy applications. According to the Danish Energy Agency, heat pumps will be a substantial part of the future heating of households and more than double its share towards 2025.

Project group
The project is carried out in collaboration with researchers from the Technical University of Denmark (DTU), the Royal Institute of Technology (KTH), Stockholm, Sweden, the Braunschweig University of Technology (TU Braunschweig), Germany, and Danfoss A/S, Denmark.
14 AUGUST 2020