Indoor Air Pollution: Analysis of Emissions from various Cooking stoves

Indoor air pollution (IAP) from biomass cook stoves seriously affects human health worldwide. Most of the biomass stoves in use are tradition cook stoves, which produce toxic emissions and consume a lot of fuel. This has prompted the introduction of improved stoves to address the problem. Improved stoves help families meet their household cooking and heating requirements without the risks posed by traditional stoves. The purpose of this study was to investigate the stove performance (in terms of IAP levels and efficiency) of stove A (an improved wood stove) and stove B (an improved charcoal stove) and compare them with traditional three stone and the Kenyan metallic Jiko. The stoves were tested using the water-boiling test (WBT). Particulate and CO and CO2 were monitored using data loggers, which all work, on the principle of light scattering. Results were entered in the WBT data calculation sheet to obtain all the parameters critical in evaluating the stoves performance.

Results indicated a 50% decrease in CO emissions in Stove A compared to the three stone fire wood stove and a 60% decrease in charcoal stove B compared to metallic charcoal jiko. All traditional stoves fell below WHO limit of 30 ppm over an hour of CO exposure.CO2 decreased by 20% and 6% with stoves A and B compared to three stone and metallic jiko. Charcoal Stove B and Three-stone firewood stoves were above 600 ppm, WHO limit. There was an 80% decrease in PM2.5 in stove B, compared to metallic jiko and 17% decrease in stove A compared to three stone firewood stove. All stoves except B exceeded 0.2 mg/m3 limit set by WHO for PM2.5 when using biomass fuel. There was a 63% increase in level of efficiency in charcoal stove B compared to the Metallic Jiko while a 64% increase in thermal efficiency in stove A compared to three stone stove. A 73% and 23% decrease in specific fuel consumption was noted in firewood stove A and charcoal stove B compared to the metallic and three stone firewood stove respectively. Objectives of the study were met.

Documentation :