science

Ton of refrigeration

Ton of refrigeration is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Ton of refrigeration rather than just read about it. In short: A ton of refrigeration (TR or TOR), also called a refrigeration ton (RT), is a unit of power used in some countries (especially in North America) to describe the heat-extraction rate of refrigeration and air conditioning equipment. It was originally defined as the rate of heat transfer that results in the freezing or melting of 1 short ton (2,000 lb; 907 kg) of pure ice at 0 °C (32 °F) in 24 hours.

Key takeaways

Ton of refrigeration belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Ton of refrigeration to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Ton of refrigeration from memory before moving on to harder problems.

Reference excerpt

A ton of refrigeration (TR or TOR), also called a refrigeration ton (RT), is a unit of power used in some countries (especially in North America) to describe the heat-extraction rate of refrigeration and air conditioning equipment. It was originally defined as the rate of heat transfer that results in the freezing or melting of 1 short ton (2,000 lb; 907 kg) of pure ice at 0 °C (32 °F) in 24 hours. The modern definition is exactly 12,000 BtuIT/h (3.516853 kW). Air-conditioning and refrigeration equipment capacity in the U.S. is often specified in "tons" (of refrigeration). Many manufacturers also specify capacity in Btu/h, especially when specifying the performance of smaller equipment.

History The ton of refrigeration is equivalent to the consumption of one short ton of ice per day and originated during the transition from stored natural ice to mechanical refrigeration. Just as horsepower and candlepower were intuitive units of measure for people living through the transition from horse to steam power and from flame-based to electric lighting, so was the ton of refrigeration an intuitive unit of measure during a technological change, as the ice trade gradually included growing percentages of artificial ice (ice from ice-making plant) in addition to its natural ice supplies. The TR unit was developed during the 1880s. Its definition was set at the level of an industry standard in 1903, when Thomas Shipley of the York Manufacturing Company led the formation of an industry association (the Ice Machine Builders Association of the United States) along with standardization of several equipment specifications. In 1904 these efforts led to the founding of the American Society of Refrigerating Engineers (ASRE), which was one of the predecessors of ASHRAE.

See also Heating, ventilation, and air conditioning Joule Ton

References

Bibliography Rodengen, Jeffrey L (1997), The Legend of York International, Write Stuff Syndicate Inc, ISBN 9780945903178, LCCN 95062225, OCLC 37507402.

Worked examples

Example 1 — a first encounter with Ton of refrigeration

Start with the simplest possible case. Write down what Ton of refrigeration claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Ton of refrigeration before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Ton of refrigeration ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Ton of refrigeration

In research: Ton of refrigeration appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Ton of refrigeration in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Ton of refrigeration is common in secondary-school and first-year university syllabi. It links to neighbouring topics Customary units of measurement in the United States, Units of power, so understanding it makes those chapters shorter.
In everyday life: Look for Ton of refrigeration outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Ton of refrigeration in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Ton of refrigeration means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Ton of refrigeration out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Ton of refrigeration in simple terms?

Why does Ton of refrigeration matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Ton of refrigeration?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Ton of refrigeration.