Heat Pump Air Temperature Output

Heat Pump Air Temperature Output Calculator

Temperature Change Formula:

\[ \Delta T = \frac{Q}{\dot{m} \times c_{air}} \]

Temperature Change (ΔT):

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1. What is Heat Pump Air Temperature Output?

Definition: This calculator determines the temperature change of air passing through a heat pump system based on heat transfer rate, air flow, and air properties.

Purpose: It helps HVAC professionals and engineers evaluate heat pump performance and predict outlet air temperatures.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \Delta T = \frac{Q}{\dot{m} \times c_{air}} \]

Where:

\( \Delta T \) — Temperature change (°F)
\( Q \) — Heat transfer rate (BTU/h)
\( \dot{m} \) — Air mass flow rate (lb/h)
\( c_{air} \) — Specific heat of air (BTU/lb·°F)

Explanation: The heat energy is divided by the product of air mass flow and specific heat to determine temperature rise.

3. Importance of Temperature Change Calculation

Details: Accurate temperature change prediction ensures proper system sizing, comfort conditions, and energy efficiency in HVAC systems.

4. Using the Calculator

Tips: Enter the heat pump's heat output in BTU/h, air mass flow rate in lb/h, and air specific heat (default 0.24 BTU/lb·°F). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find the air mass flow rate?
A: Measure air velocity and duct size, then calculate using: ṁ = air density × velocity × duct area.

Q2: Why is specific heat important?
A: It determines how much energy is needed to change air temperature (0.24 BTU/lb·°F for dry air).

Q3: What's a typical ΔT for heat pumps?
A: Residential systems typically produce ΔT of 15-25°F in heating mode.

Q4: Does this account for humidity?
A: No, this assumes dry air. For moist air, use enthalpy calculations instead.

Q5: How does this relate to COP?
A: COP (Coefficient of Performance) would be calculated separately using energy input vs. Q.