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Appendix 5  Gas appliance design

The design of biogas burners depends on the properties of biogas. The basic theory for the design of biogas burners uses fluid flow theory and defines the sizes of key parameters, including the diameters of the gas jet and the mixing tube throat. The total area of the flame ports is another important dimension. Methods can be used to improve the stability of gas flames.

Appendix 6  Follow-up surveys

Surveys are part of the work of follow-up, which is a key part of a biogas extension programme. Surveys start with secondary sources: existing information on the survey area. Different types of survey include inspection, questionnaires, group interviews, use of key respondents and field measurements. Surveys must be carefully planned and then tested by using a pilot survey.

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