1. What is a Heat Pump Calculator?

Definition: This calculator estimates the heat transfer rate (in BTU/h) for a heat pump system based on water flow rate and temperature difference.

Purpose: It helps HVAC professionals and engineers determine the heating capacity of heat pump systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q_{btu} \) — Heat transfer rate (BTU/hour)
• \( Q \) — Water flow rate (gallons per minute)
• \( \Delta T \) — Temperature difference (°F)
• 500.4 — Conversion constant (lbs/gal × min/hour × BTU/lb-°F)

Explanation: The formula calculates how much heat is being transferred based on how much water is flowing and how much its temperature changes.

3. Importance of Heat Pump Calculations

Details: Accurate heat transfer calculations ensure proper system sizing, energy efficiency, and optimal performance of heat pump systems.

4. Using the Calculator

Tips: Enter the water flow rate in GPM and temperature difference in °F. Example: 5 GPM with 20°F ΔT = 50,040 BTU/h.

5. Frequently Asked Questions (FAQ)

Q1: What does 500.4 represent in the formula?
A: It's the product of water density (8.34 lb/gal), minutes per hour (60), and specific heat of water (1 BTU/lb-°F).

Q2: Can I use this for cooling calculations?
A: Yes, the same formula applies for both heating and cooling calculations.

Q3: What's a typical ΔT for heat pumps?
A: Most heat pumps operate with ΔT between 10-20°F, but consult manufacturer specifications.

Q4: How do I measure flow rate?
A: Use a flow meter or calculate from pump curves and pipe sizing.

Q5: Does this account for system efficiency?
A: No, this calculates theoretical heat transfer. Actual system capacity depends on COP and other factors.