1. What is a Heat Pump System Calculator?

Definition: This calculator estimates the heat pump system requirements in BTU/h based on water flow rate and temperature difference.

Purpose: It helps HVAC professionals and engineers determine the appropriate heat pump capacity for heating or cooling systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q_{btu} \) — Heat pump requirement (BTU/hour)
• \( Q \) — Water flow rate (gallons per minute, GPM)
• \( \Delta T \) — Temperature difference (°F)
• 500.4 — Constant combining water density and specific heat

Explanation: The formula calculates the energy required to heat or cool water at a given flow rate through a specified temperature difference.

3. Importance of Heat Pump Calculation

Details: Proper sizing ensures efficient system operation, prevents energy waste, and maintains comfortable temperatures.

4. Using the Calculator

Tips: Enter the water flow rate in GPM and the desired temperature difference in °F. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What does the 500.4 constant represent?
A: It combines the density of water (8.33 lb/gal) and the specific heat of water (1 BTU/lb-°F) with unit conversion (60 min/hour).

Q2: How do I determine the flow rate (Q)?
A: Measure your system's flow rate or calculate it based on pipe size and pump specifications.

Q3: What temperature difference should I use?
A: For heating, use the difference between supply and return water temperatures. For cooling, use the reverse difference.

Q4: Does this work for both heating and cooling?
A: Yes, the same formula applies to both heating and cooling applications.

Q5: How accurate is this calculation?
A: It provides a good estimate for water-based systems. For other fluids, adjust the constant based on their properties.