The rate of moisture removal is the main factor and responsible for the drying inside the greenhouse under natural convection mode. As, rate of moisture removal is higher it reduces the drying time of the crops. This term is known as instantaneous thermal loss efficiency factor (ηith ) (Prakash and Kumar, 2014c, 2015, 2014b). This factor is defined as follows: The rate of instantaneous thermal loss efficiency factor through canopy which is an indirect loss factor can be calculated as Prakash and Kumar (2014c), Prakash and Kumar (2015) and Prakash and Kumar (2014b):