A solar tunnel drier was designed and constructed at SIRDC, Zimbabwe, see Fig 1 below. Tomatoes with no prior treatment other than rinsing with water were sorted based on uniformity of ripeness after which they were then sliced to between 3-5mm thick slices. They were placed in a tray making a single layer. The tray mass was initially measured and taken out every two hours to measure the moisture loss. Hourly measurements