In Pakistan, the dairy sector represents a significant part of agricultural production and is an important source of income, especially for small farmers. Yogurt production at the farm level is important for adding value to the milk. In this study, a solar-assisted yogurt processing unit capable of performing three processes of heating, fermentation, and cooling in a single unit was developed. It consisted of a circular chamber surrounded by a coil for heating by a solar vacuum tube collector and a pillow plate for ...