1. What is Water Horsepower?

Definition: Water horsepower (WHP) is the theoretical power required to move water, calculated based on flow rate and head.

Purpose: It helps in sizing pumps and determining energy requirements for water systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( WHP \) — Water horsepower (hp)
• \( Q \) — Flow rate (gallons per minute, GPM)
• \( H \) — Total head (feet)
• 8.34 — Weight of water (lbs/gallon)
• 3960 — Conversion factor (ft-lb/min per hp)

Explanation: The formula calculates the power needed to lift water at a given flow rate against a specific head.

3. Importance of Water Horsepower Calculation

Details: Proper WHP calculation ensures correct pump selection, energy efficiency, and system performance.

4. Using the Calculator

Tips: Enter the flow rate in GPM and total head in feet. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between WHP and BHP?
A: WHP is theoretical power, while Brake Horsepower (BHP) includes pump efficiency losses.

Q2: What is total head in this calculation?
A: Total head is the vertical distance plus friction losses in the system.

Q3: Why is 8.34 used in the formula?
A: This represents the weight of one gallon of water in pounds at standard conditions.

Q4: How do I account for pump efficiency?
A: Divide WHP by pump efficiency (as decimal) to get required BHP.

Q5: What's a typical WHP for residential systems?
A: Most home water systems require 0.5-2 WHP, depending on well depth and flow needs.