What you can find in Heat Load Calculator

Based on ASHRAE standards and evaluation of thermal food properties we have developed beta stage heat load calculator for cold rooms and blast freezers.

There are a lot of heat load calculators out there, but none of them provides exact solution for people. In this article, I would like to show you how the program works and how its calculation look like.

**Calculation example**

Design criteria:

Propose of system design for room cooled to –35°C, with the optimum heat load of 200kW. Calculations are based on four session weather scenario. With the customer need as storage of 24000kg of Cod fish pull-down time is exact eighteen hours. Product entering temperature seven census degree. Final temperature, which we want to cool the product is minus thirty-five census degree.

Selection taken from programs database:

Product Type: Fish

Product Name: Cod

Initial Frezzing Point: -2.2°C

Specific Heat Above Freezing: 3.78 kJ/(kg·K)

Specific Heat Below Freezing: 2.14 kJ/(kg·K)

Latent Heat of Fusion: 271 kJ/kg

\[

Q_{above}=\ \frac{Mass\ \times{}Specific\ heat\ above\

freezing\times{}\Delta{}t}{time}

\]

\[

Q_{above}=\ \frac{24000\ \times{}3.78\times{}7.2}{86400}

\]

\[

Q_{above}=\ 7.56kW

\]

\[

Q_{below}=\ \frac{Mass\ \times{}Specific\ heat\ below\ freezing\

\times{}\Delta{}t}{time}

\]

\[

Q_{below}=\ \frac{24000\ \times{}2.14\ \times{}32.8}{86400}

\]

\[

Q_{below}=\ 19.49kW

\]

\[

Q_{fusion}=\frac{Mass\times{}Heat\ of\ fussion}{Time}

\]

\[

Q_{fusion}=\frac{24000\times{}271}{86400}

\]

\[

Q_{fusion}=75.27kW

\]

\[

Q_{product}=\frac{{(Q}_{above}+Q_{below}+Q_{fusion })\times{}24h}{time\ of\

plant\ operation}

\]

\[

Q_{product}=\frac{(7.56+19.49+75.27)\times{}86400} {64800}

\]

\[

Q_{product}=136.42kW

\]

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