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The Psychrometic Chart and Its use

Form #: 630-16
In this chapter, the basic fundamentals of psychrometry as well as several examples of its use to the Service Engineer are covered.

Practical Applications of Psychrometrics

Form #: 650-002
The psychrometric chart should be a familiar friend to anyone working with HVAC systems. Psychrometrics is the science of the physical properties of air and its associated water vapor. All HVACR professionals must have a good command of the basic principles that support this science. We select, install, and service mechanical systems that are designed to manipulate the physical properties of air for the purpose of controlling its temperature, humidity level, and cleanliness. This is done to provide improved comfort within a conditioned space, as well as for other reasons—to protect construction materials used in the building, for example, or to preserve food products. The following paragraphs review eight physical properties of air: dry-bulb temperature, wet-bulb temperature, relative humidity, specific humidity, dew point, enthalpy, vapor pressure and density.

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RSES is the leading education, training and certification preparation organization for HVACR professionals. RSES publishes various comprehensive industry training and reference materials in addition to delivering superior educational programs designed to benefit HVACR professionals at every stage of their careers through instructor-led training courses, online training for HVAC, educational seminars, interactive CD and DVD products, industry-related reference manuals, and helpful technical content through Service Application Manual chapters, the RSES Journal, the RSES Journal archives and feature articles, as well as web-exclusive features.

Beginning with basic theory and extending to complex troubleshooting, training courses covering refrigeration and air conditioning, heating, electricity, controls, heat pumps and safety may be conducted in a classroom environment or though self study. RSES publications may be purchased by schools, contractors, manufacturers or any other industry group wanting to conduct comprehensive training programs. Seminars covering air conditioning troubleshooting, electrical troubleshooting, compressor training, condenser training, refrigerant piping practices, DDC controls, and more are held in various cities across North America.

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