Biofuel

December 11, 2009

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Wood Fuel Flow

November 6, 2009

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Improved Cook Stove

June 30, 2009


Dr. Krishna Raj Shrestha

1. Introduction

A cooking stove is a device in which fuel is burnt to cook food. It is usually located in kitchen. Besides cooking food, a stove is also used for heating the room, drying of certain items and agro-processing activities (AEPC, 2000).Improved cooking stove is a device that is designed to consume less fuel and save cooking time, convenient in cooking process and creates smokeless environment in the kitchen but the traditional ‘Chulo’ can’t do the mentioned function efficiently.

1.1 Design Features

The design of an Improved Cook Stove (ICS) involves the application of heat transfer, combustion and fluid flow principles in order to attain complete combustion of the fuel with a minimum amount of excess air, maximum transfer of heat from the flame and the flue gases to the cooking vessel, and a minimum loss of heat to the surroundings. The stove consists in principle of a combustion chamber, pot holder and baffle depending upon the type of stove and chimney.

Combustion Chamber:

In the household cooking stove, the combustion chamber is made of clay or brick mixed with chipped rice straw/agriresidue with a diameter of 20cm. and height of 14 to 19cm. respectively. A metal grate is placed at the bottom of the combustion chamber and about 10cm. height from the base. The aperture in grate for the passage of air is approximately 30 per cent of total grate area. Below the grate, there are two 6 sq. cm. second air holes on opposite sides for better mixing of air in the combust chamber. The fuelwood supply door is 12 x 15 sq. cm.

In the Institutional cooking stove , the cooking pot is sink into the combustion chamber and is made of brick and clay mixed with agri-residues with a diameter of 6 cm. and height of 26 cm. respectively. A metal grate is placed at the bottom of the combust chamber and about 20 cm. height from the base. The aperture in grate for the passage of air is approximately 40 per cent of total grate area. below the grate there are two 12 cm. diameter secondary air holes on opposite sides for better mixing of air in the combustion chamber. The fuelwood supply door is 20 cm. x 40 cm.

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Using a biogas digester

June 23, 2009

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Improved Cook Stove

May 27, 2009

Source: Center for Rural Technology, Nepal

improved cook stove

improved cook stove

A cook stove is a device located in specific location where fuel is burnt for cooking purposes. The located space is known as kitchen. In Nepal, biomass energy: fuel wood, agro-residue and animal dung is used for cooking purpose. Use of traditional stoves such as “agenu” and “chulo” due to its low efficiency consumes more fuel increasing the burden on women. In Nepal women are mainly responsible for cooking and collection of biomass. Besides, use of biomass energy and low-grade biomass fuels leads to excessive levels of indoor air pollution. Women and children in particular are exposed to the smoke emission. This is one of the reasons for higher rates of infant mortality and morbidity. Release of incomplete carbon products in the atmosphere due to poor combustion of biomass fuels results in green house gas effect. More than 80% of the energy need of Nepal is met by fuel wood thus exerting immense pressure on the forest resources of the country.

What is a Traditional Cooking Stove?

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