Metal-organic frameworks for cycling heat transformation processes
Porous metal-organic frameworks (MOFs) have attracted tremendous attention over the past years due to their porosity, large inner surface area, tunable pore sizes and topologies, which leads to versatile architectures und promising applications.
In our work we investigate together with partners the potential of MOFs in adsorption chilling or adsorption heat pump processes (Fig. 1).
Figure 1 Principle of adsorption chilling or adsorption heat pump.
1. Working cycle: A working fluid (typically H2O) is evaporated at low pressure by application of evaporation heat Qevap, and adsorbed at a microporous material, releasing adsorption heat Qads.
2. Regeneration cycle: When the adsorbent is saturated, driving heat Qdes is applied for desorption of the working fluid. The vapour then condenses at a cooler, and condensation heat Qdes is released. Low temperature heat is depicted in blue, medium T heat in green and high T heat in red.