HVACR FORMULAS
HVACR FORMULAS . TON OF REFRIGERATION - The amount of heat required to melt a ton (2000 lbs.) of ice at 32°F . 288,000 BTU/24 hr. 12,000 BTU/hr. APPROXIMATELY 2 inches Hg. (mercury) = 1 psi. WORK = Force (energy exerted) X Distance . Example: A 150 lb. man climbs a flight of stairs 100 ft. high
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Online Classes Heating, Ventilation, Air …
hvacrassets.netPage 1 HVACRedu.net Catalog 6/8/18 MASTER CATALOG Online Classes Heating, Ventilation, Air Conditioning, and Refrigeration New-to-the-Industry, Apprentice through Senior Technician Programs,
Measuring Total Pressure and Velocity Pressure
hvacrassets.netIn operating duct systems, a second pressure is always present. It s independent of air velocity or movement. Known as static pressure, it act equally in all directions. In air conditioning work, this pressure is also measured in inches w.c. In pressure or supply systems, static pressure will be positive on the discharge side of the fan.
PNEUMATIC CONTROL FUNDAMENTALS
hvacrassets.neta valve or damper (Fig. 1). In a typical control system, the final control element (a valve or a damper) is selected first because it must produce the desired control results. For example, a system designed to control the flow of water through a coil requires a control valve. The type of valve, however, depends on whether the water is intended
Psychrometric Chart Fundamentals
hvacrassets.netPSYCHROMETRIC CHART FUNDAMENTALS ENGINEERING MANUAL OF AUTOMATIC CONTROL 40 THE ABRIDGED PSYCHROMETRIC CHART Figure 2 is an abridged form of Chart No. 1. Some of the scale lines have been removed to simplify illustrations of the psychrometric processes. Smaller charts are used in most of the subsequent examples. Data in the examples …
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