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Download HVAC Instant Answers by Peter Scott Curtiss, Newton Breth PDF

By Peter Scott Curtiss, Newton Breth

The booklet should be released in a versatile, five" x eight" layout choked with schematic method layouts and snap shots exhibiting how in most cases measured info can be utilized to spot working issues of the HVAC gear. it's anticipated that approximately one area to 1 3rd of the booklet could be line drawing method schematics, pix exhibiting anticipated information in fault and no-fault states, and some images of platforms (used basically whilst one of these determine is needed for clarifying issues made within the text.)

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3 DC voltage divider. 4 Slide wire resistor. Suppose you had a controller that needed to know the difference between the outside air temperature and the supply air temperature in a building. 5. These kinds of devices are often used in HVAC sensors that must respond to a small change in voltage or current. If all the resistances in this circuit are equal, then the output voltage Vo equals zero. Now suppose R3 is a variable resistor that measures the outside air temperature (this is called the compensation resistor, Rc) and R2 is a variable resistor that measures the supply air temperature.

3 Expansion of copper tubing and steel pipe on temperature rise. 4 Z and U bends used to take up expansion and contraction of piping length. Water, Steam, and Pipes 41 fastfacts Plastic pipe expands about five times as much as copper piping for a given temperature change. Be very careful when mounting and supporting plastic piping to account for this. Piping should be insulated to provide both safety and energy conservation. Hot water and steam piping should be insulated to prevent excessive heat loss from the pipe and to prevent the pipe from making the surrounding environment too hot.

This can be compared to the rated coil capacity to see if the coil is working correctly. If you don’t have the coil specifications, you can estimate the capacity using the NTU method. In this method, the capacity rates for each of the two fluid streams is calculated by multiplying the mass flow rate (in pounds per minute) and the specific heat. The capacity rate has the units of energy per time per degree (for example, Btu/hr·°F) and is calculated for the hot and the cold fluids: ˙ hot ⋅ c p,hot Chot = M ˙ C =M ⋅c cold cold p,cold The minimum capacity rate Cmin is the smaller of the two capacity rates and is the limiting factor, as is the temperature difference between the inlet temperatures of the hot and cold fluids.

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