The depth of the channel does not affect the thermal efficiency or the heat output.
This investigation is being continued:
The current results are based only on one height of channel. Further experiments are being undertaken using channels of different heights to assess the effect of this parameter.
Temperature and velocity data within the test rig, as it heats up and cools down, are being analysed to assess the transient behaviour of the system.
In a practical system operating as s solar collector, the inlet and outlet would be connected to a room via some kind of duct. Also, the inlet temperature would be different to the ambient