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Unformatted text preview: 1. Refrigeration calculation 2 How much heat must be removed when refrigerating 3 pounds of ground beef (70% moisture content) with a specific heat above freezing of 0.77 BTU/lb*F from 70F to 38F? Student Response Value Correct Answer Feedback 1. 98.56 BTUs 0% 2. 73.92 BTUs 100% 3. 51.74 BTUs 0% 4. 68.99 BTUs 0% Score: 4/4 2. Freezing calculation 2 Ground beef (70% moisture) has a specific heat above freezing of 0.77 BTU/lb*F, a specific heat below freezing of 0.40 BTU/lb*F, and a freezing point of 28F. The latent heat of water is 144 BTU/lb. Assuing all of the water freezes, the amount of heat required to be removed when freezing 3 pounds of ground beef from 70F to -5F is 439 BTUs. Student Response Value Correct Answer True 100% True Score: 6/6 3. Thermal death rate What is the D-value for a process that starts with 1000000000 viable, pathogenic microorganisms, and...
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- Spring '11