🔍 Key Concepts

• Relationship between tons of refrigeration and BTU per hour (BTU/hr) • How many BTUs are required to melt one ton of ice in 24 hours • Converting a per day heat removal rate to a per hour rate

💭 Think About

• Think about the definition: a refrigeration "ton" is based on melting 2,000 pounds of ice at 32°F in 24 hours. How many BTUs does that process require? • Once you know the total BTUs per day, what do you get when you divide by 24 hours? Does that value appear among the answer choices? • Compare the per‑hour values in the choices to a realistic size for typical air‑conditioning equipment rated in tons (e.g., 1 ton, 2 ton). Which BTU/hr numbers look plausible for that?

✅ Before You Answer

• Be clear on the BTU per pound of ice needed to change from ice at 32°F to water at 32°F (latent heat of fusion). • Multiply BTU per pound × 2,000 lb to get BTU/day for one ton, then divide by 24 hr/day to get BTU/hr. • Check which answer choice, when multiplied by 24 hr, comes closest to the expected BTU/day for melting one ton of ice.