Any refrigeration professional must understand the most common unit used in refrigeration, the “ton of refrigeration”. To properly explain what a “ton” is in a refrigeration context, studying refrigeration history is helpful. When the refrigeration vapor compression cycle was first invented, the most common application of a refrigeration system was making blocks of ice. Once […]
To reinforce what is known about the states of matter, it can be helpful to study the heat energy profile of water. The graph below shows heat, measured in BTUs, applied to a pound of water on the horizontal axis and the temperature change of the water on the vertical axis. The values displayed are […]
When a substance changes state from solid to liquid, or from liquid to vapor, it is said to undergo a phase change. Interestingly, as heat is applied or removed from a substance during a phase change, the temperature of the substance remains constant. For example, when a block of ice melts to form water, the […]
Oftentimes, heat gains and losses can be measured with a thermometer. When this is the case, the heat can be “sensed” and we call it “sensible heat”. Raising the temperature of water from 20ºF to 40ºF is an example of sensible heat. The formula used to calculate the heat required to raise the temperature of […]
Have you ever wondered why some things heat up quicker than others? Or why some substances might take several minutes to get hot, while others only take a few seconds? It is well understood that as heat is applied to a substance in a single state, the temperature of the substance will increase. Experiments have […]
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