Per S. Nielsen's (PSN) Homepage


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Title: Per S. Nielsen's (PSN) Homepage
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Per S. Nielsen

Per S. Nielsen, civilingeniør, ph.d.-studerende

Civilingeniør fra DTU 1990
Ansat på IBE siden 1990

Bygning 118, rum 246
Tlf: 45 25 19 49
email: psn@ibe.dtu.dk

Efficiency tests on the pyrolysis gasifier stove Peko Pe

This paper presents results from water boiling tests on the pyrolysis gasifier stove Peko Pe, which has been developed by the Norwegian Paal Wendelbo. The stove efficiency determined vary between 21 and 29% when burning dry Danish woodchips (10% moisture) with an estimated caloric value of 16 MJ/kg. CO-emissions have been determined with varying distance between the stove and the pot to estimate the combustion efficiency. Efficiency tests performed in Adjumani refugee camp with grass as fuel show a stove efficiency of 25-29% with a caloric value of 14 MJ/kg. It has not been possible to determine the water content in the grass. In Adjumani refugee camp it was furthermore found that the stove was able to provide sufficient energy from solid combustion, after the pyrolysis was stopped, to boil water for additional 25-30 minutes with lid. This effect was not seen in the tests on woodchips in Denmark. Advantages and disadvantages of the stove compared to three-stone stoves are discussed and perspectives are outlined for further improvements of the stove.

If you want to download the entire paper (Word 6.0-document) then click here for zip-file (23000 bytes) and click here for Word-file (79360 bytes).

Energy conservation options for cooking with biomass in Ghana

Cooking is the main energy consuming activity in Ghana. This is mainly due to a generally low material standard of living, but also because the cooking process itself is energy inefficient. The fuel for cooking in Ghana is mainly biomass either in the form of wood, agricultural residues or charcoal. An energy chain for the cooking process is established and the possible conservation options are surveyed in kitchen performance tests in Abodom in the tropical zone of Ghana. The energy consumption for the food preparation has been measured and energy saving options have been determined for some parts of the energy chain. The results show that the possible options for energy conservation through the entire energy chain of the present technology are at least of the same magnitude as that involved in just switching to a more efficient biomass stove. The heat loss is largest while simmering when the boiling point has been reached. Most cooks tend to continue using a high heat supply even though it is not necessary. This process is often carried out without lid on the pot even though the use of lid will reduce the energy loss considerably. It is also concluded that the average fuelwood consumption in Abodom per household (tropical zone) only is 20% higher than the per family fuelwood consumption in the northern part of Ghana (Guinea Savanna). A larger difference in fuelwood consumption per household is normally assumed between households in tropical zones and in savanna zones.

If you want to download the entire paper (Word 6.0-document) then click here for zip-file (24166 bytes) and click here for Word-file (83456 bytes).

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Denne side er senest opdateret den 12. november 1996: Dag Stinus