1. Manufacturing Engineering Air Conditioning System Operations Copyright © Texas Education Agency, 2013. All rights reserved. 1

2. Bell Work Activity Directions- Please take out a sheet of paper and complete the following: A.List three things you like to do to keep cool on hot summer days. B.Now, imagine you planned a camping trip in the desert with no air conditioning and list three things you could do to keep cool. 2 Copyright © Texas Education Agency, 2013. All rights reserved.

3. A. There are several important terms and definitions students need to know. B. Students will now complete the Air Conditioning System Operations Matching Definitions Handout. Students may work in groups. Warm-Up Activity Air Conditioning System Operations- Terms 3 Copyright © Texas Education Agency, 2013. All rights reserved.

4. Air Conditioning System Operations Overview The air conditioning (A/C) process involves controlling air temperatures within an enclosed living environment. The basic process has been used for centuries. As technology evolved, inventors learned to use electricity, fans, refrigerants, and compressed gas to create more efficient A/C systems. 4 Copyright © Texas Education Agency, 2013. All rights reserved.

5. Air Conditioning System Operations Theory of air conditioning systems- A/C systems operate on two basic thermodynamic laws. The 1 st law states energy (i.e., heat, etc.) cannot be created or destroyed, only changed from one state (solid, liquid, gas) to another. The 2 nd law states heat always flows from and area of high temperature to an area of low temperature (heat transfer). By creating a mechanical system to control heat transfer, we create our modern day A/C systems. 5 Copyright © Texas Education Agency, 2013. All rights reserved.

6. Air Conditioning Terms Key A/C system terms British thermal unit (BTU) Refrigerant Compressor Evaporator Condenser Thermostat 6 Copyright © Texas Education Agency, 2013. All rights reserved.

7. refrigerant flow Air Conditioning System Layout Air Conditioning System- 1.Compressor 2.Evaporator 3.Condenser 4.Thermostat 7 1. 3. 2.2. 4. cool airwarm air Copyright © Texas Education Agency, 2013. All rights reserved.