Garlic Peeler

January 19th 2018

Objective

deterime CFM requirements of Garlic Peeler Currently using a rented outdoor compressor. Problems

• Lines freeze
• Uses Diesel. Expensive to operate.
• expensive to rent
• requires maintainence

Query

What capacity is required to run the peeler?

Method

The system has 400 US gal storage tank. which has a capacity of 53.5 cubic feet At 120 psi (8.2 bar) the tank contains 438 cubic feet of compressed air. at 90 psi (6.2 bar) the tank contains 331.7 cubic feet of air.

Tank Pressure	Tank Pressure Full	Tank Pressure	difference	tank volume	Cu.ft. consumed
120 psi	8.2 bar	1.0 bar	7.2 bar	53.5 cu.ft.	385.2 cu.ft.
98 psi	8.2 bar	6.75 bar	1.45 bar	53.5 cu.ft.	77.6 cu.ft.
94 psi	8.2 bar	6.48 bar	1.72 bar	53.5 cu.ft.	92 cu.ft.
93 psi	8.2 bar	6.4 bar	1.8 bar	53.5 cu.ft.	92 cu.ft.
90 psi	8.2 bar	6.2 bar	2.0 bar	53.5 cu.ft.	107 cu.ft.
87 psi	8.2 bar	6.0 bar	2.2 bar	53.5 cu.ft.	118 cu.ft.
82 psi	8.2 bar	5.65 bar	2.55 bar	53.5 cu.ft.	136 cu.ft.

Determine the output of indoor compressor

The indoor compressor takes 3.8 min to fill the tank from 90 psi to 120 psi. therefore the capacity of the compressor is:

• capacity at 120 psi - capacity at 90 psi divided by the time to fill = cfm output of compressor
• (438-331.7)/3.8min = 28.0 CFM MEASURE OUTPUT OF COMPRESSOR FROM 90 TO 120 PSI

deterime the CFM consumed by Peeler

filled the tank to max pressure 120 psi (8.2 bar) and closed the feed to the tank so that no more air would be added. This gives us a measured amount of air to use. We then ran the peeler at various pressures and recorded the time and the pressure to drop. From this data we can calculate the CFM consumed at the various pressures.

Regulator Set	Start psi	end psi	cubic Feet	time	CFM
115 psi	120 psi	93 psi	96 cu.ft.	0.5 min	192 CFM
100 psi	120 psi	94 psi	92 cu.ft.	0.5 min	184 CFM
90 psi	120 psi	98 psi	77.6 cu.ft.	0.5 min	155 CFM
90 psi	120 psi	87.5 psi	116 cu.ft.	0.75 min	154 CFM
80 psi	120 psi	82 psi	136 cu.ft.	1.0 min	136 CFM