Fixture Heat Loss Calculator

Detailed Description

This calculator is used to estimate heat losses of process heating equipment due to fixtures, trays, conveyor belts, and similar equipment that enter the furnace at lower temperatures and are heated to the furnace temperature. These fixtures absorb heat from the furnace as they are heated from their initial temperature to the final furnace temperature. The calculator computes the total heat loss based on the feed rate, specific heat of the fixture material, initial and final temperatures, and a correction factor [3]. The calculation assumes there is no melting or phase change of the fixture material involved.

The calculation follows a top-down approach:

1. Total Heat Loss - Calculate sensible heat absorbed by fixtures as they are heated

Relevant formulas are documented below.

Total Heat Loss

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Total heat loss due to fixture heating.

The heat loss is the sensible heat required to raise the temperature of the fixture material from its initial temperature to the final (furnace) temperature, adjusted by a correction factor. This represents energy absorbed by the fixtures that is not available for the primary heating process.

\begin{equation}\label{eq:fixture-heat-loss} Q = \dot{m} \cdot c_p \cdot (T_\text{final} - T_\text{initial}) \cdot f_\text{corr}\end{equation}

Symbols

\(Q\)	Heat loss \([\unit{ \btu\per\hour}]\)
\(\dot{m}\)	Feed rate of fixture material \([\unit{ \pound\per\hour}]\)
\(c_p\)	Specific heat of fixture material \([\unit{ \btu\per\pound\degreeFahrenheit}]\)
\(T_\text{final}\)	Final temperature of fixture \([\unit{ \degreeFahrenheit}]\)
\(T_\text{initial}\)	Initial temperature of fixture \([\unit{ \degreeFahrenheit}]\)
\(f_\text{corr}\)	Correction factor \([\unit{ \unitless}]\)

Modules
	Fixture Heat Loss Formula
	Total heat loss due to fixture heating.

Files
file	fixture_heat_loss.h

Namespaces
namespace	fixture_heat_loss
	Calculates heat losses from fixtures, trays, and conveyors in process heating equipment.

Functions
double	fixture_heat_loss::totalHeatLoss (double specific_heat, double feed_rate, double initial_temperature, double final_temperature, double correction_factor)
	Calculates the total heat loss from fixtures, trays, or conveyors.

Function Documentation

totalHeatLoss()

double fixture_heat_loss::totalHeatLoss	(	double	specific_heat,
		double	feed_rate,
		double	initial_temperature,
		double	final_temperature,
		double	correction_factor
	)

This function computes the heat loss caused by fixtures, trays, conveyor belts, and similar equipment that enter the furnace at lower temperatures and are heated to the furnace temperature. The calculation assumes there is no melting or phase change of the fixture material involved.

Parameters

[in]	specific_heat	Specific heat of fixture material \([\unit{\btu\per\pound\degreeFahrenheit}]\)
[in]	feed_rate	Feed rate of fixture material \([\unit{\pound\per\hour}]\)
[in]	initial_temperature	Initial temperature of fixture \([\unit{\degreeFahrenheit}]\)
[in]	final_temperature	Final temperature of fixture \([\unit{\degreeFahrenheit}]\)
[in]	correction_factor	Correction factor \([\unit{\unitless}]\)

Returns

Total heat loss \([\unit{\btu\per\hour}]\)

See also

• Fixture Heat Loss Formula