Compressed Air Cost per CFM Calculator

Compressed Air Cost Formula:

\[ C = \frac{HP \times 0.746 \times t \times P_{kwh}}{Q_{cfm} \times \eta} \]

Motor Horsepower (HP):

Operating Time:

hours

Electricity Price:

$/kWh

Air Flow Rate:

CFM

System Efficiency:

Cost per CFM ($/CFM):

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1. What is a Compressed Air Cost per CFM Calculator?

Definition: This calculator determines the cost per cubic foot per minute (CFM) of compressed air based on motor horsepower, operating time, electricity cost, air flow rate, and system efficiency.

Purpose: It helps industrial users and facility managers understand and optimize their compressed air system costs.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ C = \frac{HP \times 0.746 \times t \times P_{kwh}}{Q_{cfm} \times \eta} \]

Where:

$ C $ — Cost per CFM ($/CFM)
$ HP $ — Motor horsepower
$ t $ — Operating time (hours)
$ P_{kwh} $ — Electricity price ($/kWh)
$ Q_{cfm} $ — Air flow rate (cubic feet per minute)
$ \eta $ — System efficiency (0-1)

Explanation: The formula converts horsepower to kW (0.746 factor), calculates total energy cost, then divides by total air flow adjusted for system efficiency.

3. Importance of Compressed Air Cost Calculation

Details: Compressed air is often one of the most expensive utilities in industrial settings. Understanding cost per CFM helps identify inefficiencies and optimize operations.

4. Using the Calculator

Tips: Enter motor horsepower, operating time, electricity price (default $0.12/kWh), air flow rate in CFM, and system efficiency (default 0.9). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the 0.746 factor in the formula?
A: This converts horsepower to kilowatts (1 HP = 0.746 kW).

Q2: What's a typical system efficiency value?
A: Most systems range from 0.7 to 0.9. Newer, well-maintained systems are at the higher end.

Q3: How do I measure my air flow rate (CFM)?
A: Use a flow meter or consult your compressor specifications. Some systems have built-in monitoring.

Q4: Why is cost per CFM important?
A: It helps compare different systems, identify leaks, and justify efficiency improvements.

Q5: Does this include maintenance costs?
A: No, this calculates only energy costs. Total cost of ownership would include maintenance and capital costs.