The TNAU double pot portable chulha (chimneyless) is made with two walls. Around the first pot, an annular chamber having a width of 2.5 cm is left and the outer wall is constructed. The outer wall is also extended to cover the second pot in which case the annular chamber width is 3.5 cm, because of the smaller diameter of the second pot hole. Two secondary air inlets are made, one on the outer wall with rectangular shape (17 cm x 1 cm) near the combustion chamber and the other at the bottom of the second pot hole with round shape having a diameter of 5 cm. At the bottom of the first pot hole in the base, a hole of diameter 14 cm is made and a grate (C.I.) is placed over it. For the entry of secondary air to the first pothole, 1 cm dia holes are made with a triangular pitch of 3 cm on the inner side of first pot hole and also on the tunnel projecting into the second pot hole.
4.
Cost of the unit (approx)
:
Rs. 150 /-
5.
Salient features
: :
Efficiency :26%
Contact us
Professor and Head,
Department of Bio-Energy,
TNAU, Coimbatore-641003.
Phone: 0422-6611276
Email: bioenergy@tnau.ac.in
