Heat Pump Load Calculator

Heat Load Formula:

\[ Q_{btu} = Q \times 500.4 \times \Delta T \]

Heat Load (Q_btu): BTU/h

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1. What is a Heat Pump Load Calculator?

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

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

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q_{btu} = Q \times 500.4 \times \Delta T \]

Where:

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

Explanation: The formula calculates the energy required to heat water based on its flow rate and the desired temperature increase.

3. Importance of Heat Load Calculation

Details: Accurate heat load calculations ensure proper heat pump sizing, energy efficiency, and system performance.

4. Using the Calculator

Tips: Enter the water flow rate in GPM and the temperature difference in °F. Both values must be positive numbers.

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 specific heat (1 BTU/lb-°F) with unit conversion (60 min/hour).

Q2: What's a typical ΔT for heat pump systems?
A: Most systems operate with ΔT between 10-20°F, but this depends on system design and application.

Q3: Can this be used for cooling calculations?
A: Yes, the same formula applies for cooling, just use the temperature drop instead of rise.

Q4: How do I measure flow rate (Q)?
A: Use a flow meter or calculate from pump curves and system specifications.

Q5: Does this account for system inefficiencies?
A: No, this calculates theoretical heat load. Include safety factors for real-world applications.