All the experiment has been carried out in two different cases, namely Case-I and Case-II. In Case-I solar collector is placed inside the NWIGHD and in Case-II dryer is tested without solar collector (i.e. simply keeping on the barren concrete floor). The objectives of this investigation were: (i) experimentations in no-load condition (ii) to study the thermal behaviour of designed greenhouse dryer in ambient conditions (iii) to compare the COP of the system in each case and (iv) to evaluate the HUF.