This module reviews HVAC loads and processes, introduces the psychometric chart, and discusses the energy required to change states in the chart. The concept of a "load" is foundational in HVAC. Loads can be positive or negative and are either sensible (dry), latent (moisture-based), or both. The psych (short for psychrometric) chart graphically represents the relationship between air temperature, moisture, and energy variables. With 2 known variables, any state can be identified. Enthalpy is a convenient energy term that combines a state's heat and flow work. In psychometrics, specific enthalpy (in Btu per lbs. of dry air) is often used for load sizing and energy estimating purposes.
Learning Objectives
Upon completion of this course, attendees will be able to:
- Comprehend the fundamental properties of air;
- Explain how HVAC systems condition air, how much energy is expended, and what the physical properties or hurdles are when manipulating states of conditioned air;
- Define HVAC Loads and Processes;
- Deduce how to use a psychometric chart;
- Understand enthalpy and the energy required to move air through its various states.
