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The Sunseed Trust is a UK registered charity that does research intended to help peoples living in arid and near desert areas. Sunseed Desert Technology is their research centre near Almeria in south eastern Spain, the region with the most parching climate in Europe.
I attended Sunseed's Desert Technology Research Centre in June 1996 to learn about their research and to test the Anahat type of solar cooker designed by Anna Pearce of Box-Aid. The cookers are essentially a 90 degree cone of Mylar, 40cms across the opening, oriented towards the sun, the food being placed in a blackened container, covered by a clear plastic baking bag, sitting in the centre of the cone.
Three variants of the Anahat were tested:
I conducted the tests on Wednesday the 26th of July, 1996, at the Sunseed Desert Technology research centre near Sorbas, Almeria, Spain (36°N, 2°W) in line with their testing methodology. Sunseed's ULOG and Adobe cookers were used for comparison.
500cc of sunflower oil was placed in each test container. Weather conditions were 1 to 4 eights cumulus cover with 1 to 3 force winds. Each cooker was aligned once an hour on the hour.
Environment ULOG Box Cooker Adobe Ref. Cooker Anahat Cookers
Amb. Wind Small Large Base Small Large Base
Time Temp. Speed Pot Pot Plate Pot Pot Plate A-1 A-2 A-3
11:00 25 a
12:00 25 102 108 95 87 67 67 117 103 117 a
13:00 27 40 67 78 28 34 70 38 25 29 b
13:15 b
13:30 28 1.04 60 72 90 48 55 75 68 38 53
13:45 29 1.71 73 87 96 58 63 79 81 60 70
14:00 29 1.91 80 92 92 61 61 79 83 65 73
14:15 29 2.39 89 101 103 67 69 76 99 75 86
14:30 29 1.80 97 108 110 68 70 80 110 86 94
14:45 29 1.91 102 116 112 70 75 81 116 94 102
15:00 28 1.59 106 120 116 74 76 80 117 97 102
15:15 29 2.52 109 121 116 79 80 93 120 104 104
15:30 28 2.13 112 124 114 83 83 92 120 107 103
15:45 27 1.94 116 126 116 88 86 92 117 109 101
16:00 27 2.76 116 128 117 91 90 92 114 109 100
16:15 27 2.09 118 129 116 88 91 93 114 112 100
16:30 26 2.99 119 132 119 89 94 94 114 114 100
16:45 26 2.53 121 133 120 88 93 98 111 114 99
17:00 26 3.01 120 133 120 89 94 94 104 111 95
a) Cookers and pots were preheated for two hours before adding the oil.
b)
Due to operational difficulties the 13:00 readings may be inaccurate, and the
13:15 readings were missed.
All temperatures are in degrees Centigrade. Wind speeds are in metres per second. Times are local time (CET), being solar time plus approximately one hour.
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