1. What is a psi to inH2O Calculator?

Definition: This calculator converts pressure measurements from pounds per square inch (psi) to inches of water column (inH2O).

Purpose: It helps engineers, HVAC technicians, and fluid system designers convert between these common pressure units.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{inH2O} \) — Pressure in inches of water column
• \( P_{psi} \) — Pressure in pounds per square inch

Explanation: The conversion factor 27.68 comes from the standard relationship where 1 psi equals approximately 27.68 inches of water column at 60°F.

3. Importance of Pressure Unit Conversion

Details: Different industries use different pressure units. HVAC systems often use inH2O while hydraulic systems use psi. Conversion ensures proper system design and troubleshooting.

4. Using the Calculator

Tips: Simply enter the pressure value in psi and click calculate to get the equivalent inH2O value.

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor 27.68?
A: This value is based on the standard density of water at 60°F (16°C) where 1 psi equals 27.68 inches of water column.

Q2: Does temperature affect the conversion?
A: Yes, water density changes with temperature, but for most practical applications, the standard factor is sufficient.

Q3: What's a typical inH2O value for HVAC systems?
A: Residential HVAC systems typically operate in the 0.1-1 psi (2.8-27.7 inH2O) range for duct pressures.

Q4: Can I convert inH2O back to psi?
A: Yes, divide inH2O by 27.68 to get psi. We may add this reverse calculation in a future update.

Q5: Is this the same as inches of mercury (inHg)?
A: No, inH2O is water column while inHg is mercury column. 1 psi = 2.036 inHg (a different conversion factor).