Sensible Heat Given Out By Coil Using By-Pass Factor Calculator

Sensible Heat Formula:

\[ SH = \frac{U \times A_c \times (T_f - T_i)}{\ln\left(\frac{1}{BPF}\right)} \]

Overall Heat Transfer Coefficient (U):

W/m²·K

Surface Area of Coil (A_c):

m²

Final Temperature (T_f):

Initial Temperature (T_i):

By Pass Factor (BPF):

(0-1)

Sensible Heat (SH):

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1. What is Sensible Heat?

Sensible Heat is a type of energy released or absorbed in the atmosphere that results in a temperature change, without a change in phase. It's the heat that can be "sensed" or measured by a thermometer.

2. How Does the Calculator Work?

The calculator uses the Sensible Heat formula:

\[ SH = \frac{U \times A_c \times (T_f - T_i)}{\ln\left(\frac{1}{BPF}\right)} \]

Where:

\( SH \) — Sensible Heat (J)
\( U \) — Overall Heat Transfer Coefficient (W/m²·K)
\( A_c \) — Surface Area of Coil (m²)
\( T_f \) — Final Temperature (K)
\( T_i \) — Initial Temperature (K)
\( BPF \) — By Pass Factor (0-1)

Explanation: The formula calculates the sensible heat transfer based on the temperature difference, coil properties, and the bypass factor which represents the coil's efficiency.

3. Importance of Sensible Heat Calculation

Details: Accurate sensible heat calculation is crucial for HVAC system design, thermal comfort analysis, energy efficiency optimization, and proper sizing of heating and cooling equipment.

4. Using the Calculator

Tips: Enter all values in appropriate units. The bypass factor must be between 0 and 1 (exclusive). Temperature values should be in Kelvin, but Celsius can be used if consistent (since temperature differences are the same in both scales).

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between sensible and latent heat?
A: Sensible heat causes temperature change without phase change, while latent heat causes phase change (e.g., evaporation, condensation) without temperature change.

Q2: What does the bypass factor represent?
A: The bypass factor indicates the inability of a coil to cool or heat the air to its temperature. A lower bypass factor means better coil performance.

Q3: Can I use Celsius instead of Kelvin?
A: Yes, for temperature difference calculations (T_f - T_i), Celsius and Kelvin give the same result since they have the same scale increment.

Q4: What are typical bypass factor values?
A: Bypass factors typically range from 0.05 to 0.3 for cooling coils and 0.1 to 0.4 for heating coils, depending on coil design and air velocity.

Q5: When is this calculation most useful?
A: This calculation is particularly useful in HVAC system design, thermal analysis of buildings, and industrial process heating/cooling applications.