Role of solar flat plate collectors in reducing green house gases in Nepal

Questionnaire survey performed to know the pattern of energy consumption for cooking, water heating and animal feeding in the outskirts of Kathmandu Valley. The site selected for the questionnaire survey was Ghimire Gaun, Biruwa, Dadhikot, village development committee of Bhaktapur district. After the data collection from a questionnaire survey, the total amount of energy consumed for cooking and water heating purpose in the village was calculated. The greenhouse gases emission from each energy sources was calculated by the linear relation between the intensity of activity and the emission resulting from the activity. The annual consumption of firewood in Ghimire Gaun was found to be about 23.5 tonne (97,905 kWh), of which about 3.18 tonne (13,235.04 kWh) is used for water heating purpose. The annual liquefied petroleum gas consumption is 1.69 tonne (23,105.48 kWh). The total amount of CO₂ reduction by one solar flat plate is around 195 kg/year. The re-boiler energy requirement for CO₂ capture process model is around 4MJ/kg CO₂. Therefore, total amount of energy required to capture the CO₂ is around 195*4MJ/year (780 MJ/year). Therefore, by installing one flat place, it can be saved 780MJ/year of energy instead of capturing CO₂ from gasification.