Podcast
Questions and Answers
What is the primary purpose of a yam barn in West Africa?
What is the primary purpose of a yam barn in West Africa?
- To store yams after curing. (correct)
- To serve as a marketplace for selling yams.
- To provide shade for crop planting.
- To cultivate yams during the growing season.
Which structural feature assists in improving ventilation in storage facilities?
Which structural feature assists in improving ventilation in storage facilities?
- Multiple exhaust vents throughout the structure.
- Air inlets located at the bottom and outlets at the top. (correct)
- Air inlets located at the top and outlets at the bottom.
- Sealed doors and windows to maintain temperature.
What is a significant benefit of using insulation in storage structures for horticultural crops?
What is a significant benefit of using insulation in storage structures for horticultural crops?
- It allows for better air circulation.
- It reduces electricity usage for cooling. (correct)
- It provides structural support to the building.
- It enhances the visibility of the stored produce.
What does a higher R-value indicate about a material used for insulation?
What does a higher R-value indicate about a material used for insulation?
Which type of fan is NOT mentioned as common in storage facilities?
Which type of fan is NOT mentioned as common in storage facilities?
What role do fast-growing trees play in the construction of a yam barn?
What role do fast-growing trees play in the construction of a yam barn?
How does a well-insulated building affect cooling methods like evaporative ventilation?
How does a well-insulated building affect cooling methods like evaporative ventilation?
Which feature is essential for maintaining produce quality in storage facilities?
Which feature is essential for maintaining produce quality in storage facilities?
What is the R-value of aged expanded polyurethane per inch?
What is the R-value of aged expanded polyurethane per inch?
Which material has the lowest R-value per inch among the listed options?
Which material has the lowest R-value per inch among the listed options?
Which insulation type has an R-value range that starts at 2.50?
Which insulation type has an R-value range that starts at 2.50?
What is the R-value for polyisocyanurate per inch of thickness?
What is the R-value for polyisocyanurate per inch of thickness?
Which insulation material's R-value is identical to that of cellulose?
Which insulation material's R-value is identical to that of cellulose?
Among the listed options, which is the most effective insulation by R-value per inch?
Among the listed options, which is the most effective insulation by R-value per inch?
What is the R-value of 8-inch concrete block with vermiculite in the core?
What is the R-value of 8-inch concrete block with vermiculite in the core?
What is the R-value for foamed-in-place insulation?
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
- Batt and Blanket Insulation:
- Mineral wool, fiberglass, and glass wool have an R-value of 3.50
- 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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