A refrigerated container filled with 10,000...

Question 1 / 205eccef9dbacbc34ba4d45e43

Question 1 of 205eccef9dbacbc34ba4d45e43

A refrigerated container filled with 10,000 lbs. of strawberries has been loaded on your ship. The set point of the box is 35°F and the interior box temperature is 90°F, and after 7 hrs. 37 minutes the box is lowered to 60°F. Based on the following information, which of the listed steps should be taken? Specific heat of cargo is 0.94 BTU/LB/°F, heat gain by container equals 4,000 BTU/hr., and refrigeration system capacity equals 3.42 tons.

Back

Question 1 of 20

5eccef9dbacbc34ba4d45e43

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

• Specific heat calculation for cargo: Q = weight × specific heat × temperature change • Conversion of tons of refrigeration to BTU/hr (1 ton = 12,000 BTU/hr) • Total heat load vs. system capacity: cargo cooling load + container heat gain

💭 Think About

• First, compute how many BTUs must be removed from 10,000 lbs of strawberries to lower their temperature from 90°F to 60°F using the specific heat given. Then divide by the elapsed time to find the required BTU/hr. • Convert the system capacity from tons of refrigeration to BTU/hr and compare it with the total load (cargo cooling + container heat gain). Is the unit keeping up with or falling behind the required rate? • Think about whether the measured temperature drop after 7 hours 37 minutes matches what a properly operating system of that capacity should be able to do.

✅ Before You Answer

• Verify your BTU removal calculation: Q = (10,000 lb) × (0.94 BTU/lb°F) × (temperature drop). • Check your time conversion to hours for 7 hours 37 minutes and use it correctly when finding BTU/hr. • Confirm the refrigeration capacity in BTU/hr (3.42 tons × 12,000 BTU/hr per ton) and whether this is sufficient given the cargo load plus 4,000 BTU/hr heat gain.

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed

Question 1 of 20

Do nothing as the system is operating correctly.

The compressor is worn out and should be replaced.

Replace the liquid line strainer.

Add Freon to the unit to increase the refrigeration effect.

Question 1 / 205eccef9dbacbc34ba4d45e43

Question 1 of 205eccef9dbacbc34ba4d45e43

Back

Question 1 of 20

5eccef9dbacbc34ba4d45e43

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed