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Questions and Answers
What is the primary purpose of a yam barn in West Africa?
Which structural feature assists in improving ventilation in storage facilities?
What is a significant benefit of using insulation in storage structures for horticultural crops?
What does a higher R-value indicate about a material used for insulation?
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Which type of fan is NOT mentioned as common in storage facilities?
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What role do fast-growing trees play in the construction of a yam barn?
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How does a well-insulated building affect cooling methods like evaporative ventilation?
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Which feature is essential for maintaining produce quality in storage facilities?
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What is the R-value of aged expanded polyurethane per inch?
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Which material has the lowest R-value per inch among the listed options?
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Which insulation type has an R-value range that starts at 2.50?
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What is the R-value for polyisocyanurate per inch of thickness?
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Which insulation material's R-value is identical to that of cellulose?
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Among the listed options, which is the most effective insulation by R-value per inch?
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What is the R-value of 8-inch concrete block with vermiculite in the core?
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What is the R-value for foamed-in-place insulation?
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Study Notes
Yam Barn Structure
- A traditional yam barn structure is used in West Africa
- Built using fast-growing trees, creating a rectangular structure for shade and framework
- Ventilation is crucial for maintaining produce quality and extending shelf life
Ventilation Systems
- Centrifugal fans are commonly used for ventilation in storage structures
- Axial flow fans are also commonly used for ventilation
- Propeller/expeller fans are another type of ventilation fan
Ventilation Location
- Air inlets should be located at the bottom of storage structures for optimal ventilation
- Air outlets should be located at the top of storage structures
- Pressure-relief flaps allow for simple, light-proof exhaust ventilation
Insulation
- Insulation in storage structures helps maintain temperature and reduces energy consumption
- Refrigerated buildings require less electricity with better insulation
- Structures cooled by evaporative or night air ventilation hold cooled air longer with better insulation
Insulating Materials & R-Values
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Batt and Blanket Insulation:
- Mineral wool, fiberglass, and glass wool have an R-value of 3.50
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Fill Type Insulation:
- Cellulose: 3.50
- Glass or mineral wool: 2.50 - 3.00
- Vermiculite: 2.20
- Wood shavings/sawdust: 2.22
-
Rigid Insulation:
- Plain expanded extruded polystyrene: 5.00
- Expanded rubber: 4.55
- Expanded polystyrene molded beads: 3.57
- Aged expanded polyurethane: 6.25
- Glass fiber: 4.00
- Polyisocyranuate: 8.00
- Wood or cane fiber board: 2.50
-
Foamed-in-Place Insulation:
- Sprayed expanded urethane: 6.25
Common Building Material R-values
- Solid concrete: 0.08
- 8-inch concrete block, open core: 1.11
- 8-inch lightweight concrete block, open core: 2.00
- 8-inch concrete block with vermiculite in core: 5.03
- Lumber, fir or pine: 1.25
- Metal siding: N/A (not specified)
- R-Value* refers to the material's resistance to heat conduction. The higher the R-value, the better the insulation.
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Description
Explore the design and function of traditional yam barns in West Africa, focusing on ventilation systems essential for preserving produce quality. Learn about different types of fans used for ventilation, optimal air inlet and outlet placements, and the importance of insulation in storage structures.
