Heat Transfer Equation with Mass Flow Rate

Heat Transfer Formula:

\[ Q_{btu} = W \times c \times \Delta T \]

Heat Transfer Rate (BTU/h):

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1. What is the Heat Transfer Equation with Mass Flow Rate?

Definition: This calculator determines the heat transfer rate based on mass flow rate, specific heat capacity, and temperature change.

Purpose: It helps engineers and technicians calculate thermal energy transfer in systems involving fluid flow.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q_{btu} = W \times c \times \Delta T \]

Where:

\( Q_{btu} \) — Heat transfer rate (BTU/hour)
\( W \) — Mass flow rate (pounds/hour)
\( c \) — Specific heat capacity (BTU/pound·°F)
\( \Delta T \) — Temperature change (°F)

Explanation: The formula calculates the thermal energy required to change the temperature of a flowing fluid.

3. Importance of Heat Transfer Calculation

Details: Accurate heat transfer calculations are essential for designing HVAC systems, heat exchangers, and industrial processes.

4. Using the Calculator

Tips: Enter the mass flow rate in lb/hr, specific heat capacity (1 BTU/lb·°F for water), and temperature change in °F. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is specific heat capacity?
A: The amount of heat required to raise the temperature of one pound of a substance by one degree Fahrenheit.

Q2: Why is water's specific heat 1 BTU/lb·°F?
A: The BTU was originally defined based on water's heat capacity, making it a convenient reference point.

Q3: Can this be used for cooling calculations?
A: Yes, simply use a negative temperature change to calculate heat removal.

Q4: How do I find mass flow rate?
A: Measure the volumetric flow rate (gallons/min) and multiply by the fluid's density (8.34 lb/gal for water).

Q5: What about phase changes?
A: This calculator doesn't account for latent heat during phase changes (e.g., boiling or condensation).