1. How does the refrigerant absorb the heat? https://youtube.com/clip/UgkxvCNlK9mpSV7LnHcpm5FZynBXHjT2t3fX?feature=shared
2. Welcome to Refrigeration Theory Course: What is Refrigeration Theory?
2.1. Refrigeration theory is the science and principles behind the removal of heat from a specific area to lower its temperature and maintain it below the surrounding environment.
2.1.1. By the end of this training, you should be able to: 1) Explain the refrigeration cycle 2) Identify the components of the refrigeration cycle 3) Explain the function of each component of the refrigeration cycle
3. There are two main principles that we are going to focus on: 1) The state of a matter (ex. our refrigerant changing from liquid to vapor/gas) 2) Heat transfer (i.e. heat naturally wants to find a cooler envrionment)
4. Review: Phase Changes (State of Change)
4.1. The 3 Primary States of Matter
4.1.1. Solid
4.1.2. Liquid
4.1.3. Vapor/Gas
4.2. Note: A refrigeration system is often refered to as a Sealed System. Simply put, a system of tubing, a compressor, an evaporator, etc. Sealed from the outside air.
4.2.1. Due to the fact that the total volume of the sealed system will not change, we are able to safely assume that volume will remain constant when we need to make temperture & pressure measurements.
4.3. Temperatures affect on a state of matter
4.3.1. Changing the temperture of matter causes it to change it's state.
4.3.1.1. Lowest Temperature would be a solid
4.3.1.1.1. For our purposes of refrigeration theory, we will primarily deal with refrigerant changing from a liquid to a vapor/gas and back to a liquid, depending upon it's current temperature.
4.3.1.1.2. Solidification of the refrigerant is not typically a concern in most refrigeration cycles because the pressures involved are not extreme enough to cause solidification of common refrigerants.
4.3.1.2. Increased temperature would change matter to liquid
4.3.1.3. Increasing the temperature further would change the matter to a vapor/gas (i.e. boiling point)
4.4. Pressure affect on a state of matter
4.4.1. In the same way, changing pressure can also change the state of matter.
4.4.1.1. Lowering the pressure affect on matter would produce a solid state.
4.4.1.2. Increasing the pressure would change the matter to a liquid.
4.4.1.3. Increasing the temperature further would change the matter to a vapor/gas. (i.e. boiling point)
4.4.1.4. Keep in mind, since the volume inside our sealed system is remaining constant, changing either the pressure or temperature will automatically have an affect on the other.
4.4.1.4.1. Simply put, if we increase temperature we will also see an increase in pressures. If we decrease temperature we will also see a decrease in pressures.