Check for plagiarism:

P$5\mathrm{.}2.$

Background: A facility has an air $250$ hp air compressor which intakes indoor air at $68F$ for a

year$-$round average. The compressor runs $\frac{24}{7}$ for the entire year.

Recommendation: install outdoor air intake ducts so that the cooler and denser outdoor air is

supplied to the compressor.

Calculate the energy savings, cost savings, implementation cost, and payback period.

Data:

Indoor year$-$round average temperature: $68F$

Outdoor year$-$round average temperature: $52F$

Load factor $-$ loaded: $100\%$

Load factor $-$ unloaded: $50\%$

Utility factor $-$ loaded: $70\%$

Utility factor $-$ unloaded: $30\%$

Efficiency: $80\%$

Operating pressure: $110$ psi

Electricity cost: $$\frac{0\mathrm{.}131}{k}Wh$ for consumption, $$\frac{18}{k}W-$month for demand

Operating hour: $8,760h\frac{r}{?}$ year

Required length of duct: $20$ ft

Ducting cost $$\frac{20}{f}t$

Estimated labor: $8$ hr at $$\frac{120}{?}$ hour