The relationship Vpz-min = 1.5 Voz defines a minimum zone supply. If Voz is 100 cfm, what is Vpz-min?

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Study for the ASHRAE 62.1 Standards and Air Systems Test. Use flashcards and multiple choice questions, each with hints and explanations. Prepare for your certification exam today!

Multiple Choice

The relationship Vpz-min = 1.5 Voz defines a minimum zone supply. If Voz is 100 cfm, what is Vpz-min?

Explanation:
The main idea is a simple multiplier: the minimum zone supply is 1.5 times the outdoor air flow. With Voz = 100 cfm, Vpz-min = 1.5 × 100 = 150 cfm. This ensures the zone receives enough fresh air to maintain proper dilution and mixing despite distribution losses. The other numbers don’t fit the 1.5 multiplier (they would be 100, 200, or 125 cfm), so 150 cfm is the correct minimum zone supply.

The main idea is a simple multiplier: the minimum zone supply is 1.5 times the outdoor air flow. With Voz = 100 cfm, Vpz-min = 1.5 × 100 = 150 cfm. This ensures the zone receives enough fresh air to maintain proper dilution and mixing despite distribution losses. The other numbers don’t fit the 1.5 multiplier (they would be 100, 200, or 125 cfm), so 150 cfm is the correct minimum zone supply.

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