Expansion valves reduce refrigerant pressure before the evaporator, controlling flow to match cooling load. Types include thermostatic, electronic, and capillary tubes.
Governing Formulah_in approximately h_out (isenthalpic)
Knowledge Check
10 Questions
1.What is the primary purpose of expansion valves?
2.Which practice improves reliability when analyzing expansion valves?
3.What is a common engineering concern in expansion valves?
4.Why are psychrometric properties used in expansion valves?
5.What should be compared when validating a expansion valves result?
6.What can happen when system parameters are poorly selected in expansion valves?
7.Which engineering habit is important when documenting expansion valves?
8.What does higher system efficiency usually indicate in expansion valves?
9.Why should physical engineering judgment still be applied to expansion valves results?
10.Which factor can most directly affect the performance of expansion valves?