An office project will have high-efficiency toilets that are pressure assisted (

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试卷: LEED AP ID+C 模拟试卷A[查看]
An office project will have high-efficiency toilets that are pressure assisted (1.0 gpf), waterless urinals, and aerated faucets that use 0.25 gallons per minute. The office project will have 400 full time occupants with 100 part time occupants (4 hours/day) working 245 days per year. The project will have a rainwater collection system that can provide 4,000 gallons monthly for sewage conveyance. What is the design case total water consumption?
A: 220,500 gallons
B: 172,500 gallons
C: 216,500 gallons
D: 193,172 gallons

参考答案: B

本题解释:
First, find FTEs.
400 + (100 part time workers/2) = 450 FTEs
No data is given on gender, so assume 50% male and 50% female.

225 Women = 3 uses of a water clost per day X 1.0 gallon per flush = 675 gallons
225 men = 1 use per day X 1.0 gallon per flush + (2 uses per day X 0.0 gallons for waterless urinals) = 225 gallons
This question refers to sewage conveyance, so there is no need to add in faucet calculations.
(675 + 225) X 245 work days per year = 220,500 gallons per year

Then subtract the water provided by the rainwater collection system.

4,000 gallons per month or 48,000 gallons per year
220,500 - 48,000 = 172,500 gallons is the design case amount.