Pakistan is facing severe natural gas crisis and all industries are
suffering. Hence all efforts should be made to save natural gas
from domestic use. The conventional radial flow natural gas stove
burners have low thermal performance because of high convective and
radiation heat losses. Swirl flow stoves have comparatively high
thermal efficiency. The shape of vessel has significant effect on
the performance of stoves. A swirl stove with two heating vessels
(a pan and a pot) was used for experiments. Three different flame
covering draft tubes were tested i.e. Ceramic mould, Aluminum draft
tube and polished steel draft tube. Thermal efficiency was checked
by heating water from 30 C to 80 C and determining consumption of
natural gas. Ceramic mould increases thermal efficiency of swirl
stove from 36 to 39.1%. The aluminum foil with ceramic mould leads
to an improvement of 45.1%. Aluminum draft tube, polished steel
draft tube and ceramic mould wrapped with aluminum foil showed 2.6,
3.8 and 5.6 % increase in thermal efficiency respectively. The work
is useful for designing modified burners and stoves to conserve
natural gas.
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