Control and instrumentation technology in HVAC : PCs and by Michael F. Hordeski

By Michael F. Hordeski

(The Fairmont Press, Inc.) Examines the connection among commercial automation ideas and evolving HVAC structures, and the way rising applied sciences will be utilized to HVAC structures. themes lined contain boiler and pump keep an eye on, warmth pump and chiller optimization, machine keep an eye on, and instant keep an eye on. DLC: Heating--Automatic keep watch over.

Show description

Read Online or Download Control and instrumentation technology in HVAC : PCs and environmental control PDF

Similar ventilation & air conditioning books

Ashrae Handbook - 1997 Fundamentals

The industry's so much accomplished resource of HVAC and refrigeration details for greater than 60 years. each bankruptcy undergoes a rigorous four-year assessment technique that examines the content material and precludes product or approach bias.

Wood Structure and Environment (Springer Series in Wood Science)

The first objective of wooden constitution and atmosphere is to bare the hidden ecological richness in stems and roots from bushes, shrubs and herbs. The precise, lucid textual content will motivate researchers to think about the anatomic microcosm of wooden crops and use it as a retrospective resource of data, fixing difficulties regarding ecophysiology, festival, web site stipulations, inhabitants biology, earth technological know-how, wooden caliber or even human background.

Guide to energy management

Here's a manager's consultant to an important components of strength expense slicing, written through 3 of the main revered strength pros within the undefined. the fundamental ambitions of power administration are insightfully tested, and the simplest ideas and instruments for reaching effects are awarded and illustrated.

Resin Transfer Moulding

Resin move Moulding offers readers with the data had to layout, enhance and manufacture excessive parts through an RTM course and gives a framework which readers can use to put their endeavours inside an commercial context. Readers are offered with info to provide them an figuring out of the clinical and theoretical heritage to RTM, thereby giving them an knowing of the foremost constraints at the procedure.

Additional resources for Control and instrumentation technology in HVAC : PCs and environmental control

Example text

The latter technique may have some instability during start­up and during light loads when some cold­ deck valves open and upset the pressure balance in the system; otherwise, it functions the same as the dual­duct, constant volume system.  In an alternate control scheme, the controller cycles the fan or modulates the fan speed with a constant water flow through the coil.  There is no mixing of chilled and hot water.  During subfreezing weather, a constant water flow through coils should be maintained to minimize the chance of coil freezeup.

No matter how hot or cold the outside air temperature gets, the earth around the ground line stays at about 50°F.  Geothermal heat pumps include Water­Furnace, Florida Heat Pump, and ClimateMaster.  In a study by the Red River Valley Rural Electric Association in Oklahoma, 99% of the GHP owners rated the heat pump's ability to provide summer comfort as an 8 or higher on a 1­to­10 scale.  A fan located inside the building distributes the warmed or cooled air throughout the interior.  An open loop system can be installed where an adequate supply of suitable water is available and open discharge is feasible.

This is a closed­loop system.  In cold weather climates, an antifreeze mixture with corrosion inhibitors, similar to those used in automobiles, is sometimes used for the solar collector portion of the loop.  The auxiliary heat only comes on when the temperature of the stored water is below the water heat thermostat setting.  If this heat is not sufficient, the auxiliary heating element is used to boost the temperature.  The air is cooled and flows through the distribution ducts.  Marginal performance results if these higher temperatures are not reached.

Download PDF sample

Rated 4.14 of 5 – based on 21 votes