FermenteaWhere food goes to change
Equipment · Drying kilns and dryers
A glazed cabinet in which sunlight passes through a transparent cover onto a dark interior while air moves over mesh trays. The Brace-type cabinet is documented with a dimensioned drawing from 1978.
A direct solar cabinet dryer is a box with a transparent cover on the sun side and a dark interior. Sunlight passes through the cover and heats the interior and the product. Air enters through screened openings low in the base, passes over the trays and leaves through vents high in the back, carrying moisture with it. An indirect dryer differs because it heats its air in a separate collector, so its product is not exposed to sunlight.
The FAO manual describes a hinged transparent lid and a mesh tray raised above the floor, with an aperture screen against insects. The top cover has to fit weather-tight. The screen is noted specifically for insect exclusion.
The most detailed record is a schedule and drawing in the UNIDO publication Technology for Solar Energy Utilization, published in 1978 as part of its Development and Transfer of Technology Series. The drawing is labelled as a solar cabinet drier and states that the dimensions were used for a dryer in a Kanpur case study. The design draws on Brace Research Institute work, which the publication credits without a date for the cabinet itself.
The schedule gives a cabinet of 198 cm length and 66 cm width, with 2 cm wood panels and plywood base panels, three 62 cm trays, three glass panes of 61 by 62 cm and 5 cm of wood-wool insulation. The same schedule lists 27 polyethylene liners of 127 mm diameter for the air holes. Leg lengths, runner positions, hole coordinates and the cover frame are not given in the text read, so the drawing needs to be read before any cut list is made.
A builder would assemble the body and legs, insulate the base and sides, drill the base air openings and fit liners, screen the apertures, mount the tray runners and trays, and then fit the glass cover with a seal or retaining moulding. The order is an interpretation of the source, not a tested sequence, and the drawing should confirm it.
Testing comes before use. Measure the temperature and humidity at the inlet, over the trays and at the outlet, with the cabinet empty and loaded. Check the air distribution across the trays, look for condensation under the cover, and check that the cover opens for cleaning. None of these tests establishes food safety.
The UNIDO publication records a solar cabinet drier with drawings and specifications, used in a Kanpur case study. Its design lineage draws on Brace Research Institute work. The FAO manual describes the same cabinet class with typical proportions, but it is not the same dimensioned unit.
Food under a glass cover receives direct radiation as well as warmed air, so the product can exceed its safe temperature range when the sun is strong.
Hazard sourceThe cover needs a weather-tight fit, and the apertures need screening against insects.
Hazard sourceFine insect netting on all air apertures
Control sourceLog temperature and relative humidity inside the cabinet and at the air inlet during each batch
Control sourceA cabinet used for fruit is not validated for raw fish or meat by that use alone.
Night-time rewetting of partly dried product is an open question for this cabinet. Measure the product's moisture across a night before relying on the cabinet overnight.
The cover admits direct sunlight onto the product as well as heating the air. Product in direct radiation can overheat, so the design is not the same as a shaded cabinet.
Source →The dimensions in the 1978 drawing are the case-study figures. They do not show the current construction standard and carry no stated tolerance.
Source →The FAO manual's food-drying guidance concerns fruit and vegetables. The cabinet is not validated for meat or fish on the basis of that guidance.
Source →The publication says the dimensions shown were used in the Kanpur case-study dryer. It gives no coordinates.
An earthen fermentation pot documented in Ayurvedic asava and arishta preparations. Studies in India compare pot and non-earthen vessels; field research in Sri Lanka records both earlier buried pots and later, varied factory practice.
A chocolate refiner or melanger uses powered rotation and stone rollers to refine cocoa mass. Some models also process nut and seed pastes; design, material and operating limits vary.
Contemporary vessels used to ferment coffee cherries or pulped coffee with restricted air exchange. Drums, rigid tanks and hermetic bags differ in material and monitoring; “anaerobic” alone does not describe a batch's conditions.
Unglazed earthen pots are used to set and often serve dahi and Bengali mishti doi. Documented forms range from small cups to shallow, broad vessels; no standard size or capacity is established.
A warm, sheltered spot or closed box used to ferment rice and black gram batter overnight for idli and dosa, where the kitchen runs cool.
A traditional Indian oil press built around a circular mortar and upright pestle, turned by an animal through a weighted beam; regional versions differ in materials, scale and drive.
Gundruk pots and dhungro are fermentation containers documented in Nepal and one Darjeeling household. FAO describes earthenware; a 2024 figure identifies a bamboo-made airtight dhungro buried in a pit within a cow-dung heap.
A handi is a cooking pot used in dum, a slow-cooking method documented in northern India. Sources record earthenware handis in a Delhi village and dough-sealed cooking pots in Awadhi and Delhi food traditions.
Soft, spreadable Calabrian pork sausage made with a great deal of red chilli and fatty pork, stuffed into natural casings, sometimes smoked and matured while staying soft.
A way to add independent temperature logging to an existing food dehydrator without changing its built-in controls or protections. It is a monitoring method, not a rewiring plan.
Pleurotus cystidiosus is the abalone mushroom, a cultivated oyster-type fungus with dark brown caps that grows more slowly and is more demanding than other Pleurotus species.
A dark, balanced vinegar from Emilia-Romagna made by combining cooked or concentrated grape must with wine vinegar, then acetifying and refining it in wood under a protected specification.
A living dairy inoculum that starts controlled cream fermentation, developing acidity and aroma before sour cream or cultured butter is finished.
A small electric incubator holds jars at a selected temperature for yogurt and other documented warm food preparations. Controls, capacity and vessel arrangement vary by model.
Adygean salt is a seasoned table salt associated with Adygea and the wider North Caucasian culinary tradition. Salt is blended with garlic and a variable selection of herbs and spices; the exact mix depends on the named style and maker.
The African Caesar-group mushroom, Amanita masasiensis, is a wild ectomycorrhizal species of central and southern African woodlands, eaten locally. The genus contains deadly poisonous species, so identification needs care.
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UNIDO, Development and Transfer of Technology Series No. 5History · Method
Technology for Solar Energy Utilization (Figure 24, solar cabinet drier drawings and specifications)Figure 24 gives dimensions for a solar cabinet drier used in the Kanpur case study, with a 198 cm length and 66 cm width.
The cabinet has a transparent cover, screened base apertures, mesh trays and upper rear vents; insulation is at least 5 cm.
Design lineage draws on Brace Research Institute work.
Cited in: Origin and the 1978 drawing; Building and testing one
FAOMethod · Safety
Home-based Fruit and Vegetable Processing in Afghanistan: A Manual for Field Workers and TrainersThe Brace-class cabinet dryer has a hinged transparent lid and a mesh tray raised above the floor.
Fine netting is specified for the aperture screen against insects.
The food-drying instructions concern fruit and vegetables.
Cited in: What it is; Building and testing one
FAOHistory
FAO dryer taxonomyCited for the direct and indirect solar dryer categories in the FAO dryer taxonomy.
Cited in: What it is