Experimental comparison of energy and exergy analysis of a new designed and a Normal Trombe wall

The present study experimentally analyses the exergy and energy of a new designed and a normal Trombe wall in the coldest day of the year (5 January 2021) in Yazd, Iran. Unlike the normal Trombe wall, the new design of Trombe wall has a smaller width than the normal one increasing the indoor area. Furthermore, the new design can receive the solar radiation from three directions from sunrise to sunset in the winter. Accordingly, the absorber and other parts of the new designed Trombe wall experience higher temperature compared to the normal Trombe wall resulting in increasing the convection, conduction and radiation heat transfer and improving the energy efficiency of the new designed Trombe wall 6% more than that of the normal one. The useful exergy in the new designed Trombe wall increases 3W more than in the normal one enhancing the exergy efficiency in this type of Trombe wall as well. Analysis of exergy destruction in various parts of the system indicates that the new Trombe wall had higher exergy destruction than the normal type due to the higher temperature in all its parts. Also, the results of the energy and exergy analysis of two Trombe walls show that the new Trombe wall had better thermal performance in terms of energy and exergy. •Energy and exergy of a Trombe wall with a new design was compared with a normal one.•Average heat efficiency of the new type was almost 6% higher than the normal type.•Exergy efficiency of the new type was roughly 0.2% higher than the normal type.•Exergy destruction of the new type was larger due to its parts' higher temperature .