1. What is a Pounds per Hour to Horsepower Calculator?

Definition: This calculator estimates horsepower based on fuel mass flow rate, heating value, and time.

Purpose: It helps engineers and technicians determine engine power output from fuel consumption data.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Horsepower
• \( W_f \) — Fuel flow rate (pounds per hour)
• \( h_v \) — Heating value (BTU per pound)
• \( t \) — Time (hours)
• 2545 — Conversion factor (BTU per hour to horsepower)

Explanation: The formula converts fuel energy content (BTU) to mechanical power (horsepower).

3. Importance of Horsepower Calculation

Details: Accurate horsepower estimation is crucial for engine performance analysis, fuel efficiency calculations, and equipment sizing.

4. Using the Calculator

Tips: Enter the fuel flow rate in lb/hr, heating value (default 19,000 BTU/lb for diesel), and time (default 1 hour). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the 2545 constant?
A: It's the conversion factor from BTU per hour to horsepower (1 HP = 2545 BTU/hr).

Q2: What's a typical heating value for fuels?
A: Diesel ~19,000 BTU/lb, gasoline ~18,500 BTU/lb, jet fuel ~18,400 BTU/lb.

Q3: Can I use this for different time periods?
A: Yes, but ensure your fuel flow rate matches the time unit (e.g., lb/hr with hours).

Q4: Does this calculate brake or indicated horsepower?
A: This calculates theoretical power output. Actual brake horsepower will be lower due to efficiency losses.

Q5: How does efficiency factor in?
A: For actual power output, multiply the result by the engine's thermal efficiency (typically 30-45% for diesels).