HVAC Control in the New Millennium.pdf - HVAC.Amickracing

dows are implemented as Java applets that are automatically downloadedto the browser.Control software will include object-oriented languages, with fillin-the-blanktemplates for control loops. PCs will be used to configureand test the control package off-line and then download it into the realtimesystem. The WIMP (windows, icons, mouse, pointers) concept willtake over the role of typewriter-like keyboards. Multi-language controlsoftware will reduce the chances of operator error by displaying informationin German, French and other languages.The technology of heating has gone from simple attempts to keepspace areas warm to sophisticated computerized systems that track occupantslevels, seasons, time-of-day, outdoor temperature and humidityconditions. Ventilation will continue to play a key role in occupant comfortlevels and plant efficiency. Air cleanliness will become more importantand more emphasis will be placed on dust, bacteria, odors and toxicgases which may affect human health and comfort.The close control of the amount of outdoor air used in the HVACsystem is only one of the areas being mined for energy savings. Excessiveenergy consumption is often due to the infiltration of outdoor airwhich can account for about 1/2 of the total heating and cooling loadsin some public buildings. Building conditioning accounts for about 20%of the total energy consumed in the U.S., so computer-optimized HVACsystems can make a major contribution in reducing our national energyuse in the next millennium.The nature of utility demand-side management (DSM) is changing.Many energy efficiency measures are difficult to promote through theutilities. Equipment efficiency standards are expected to lower nationalelectricity use by several percentage points.The computer revolution is moving towards an emancipation withan overwhelming and comprehensive impact. When the machine agebegan, it surged into motion and almost ran its course before mostpeople were aware of what had happened. We have the gift of bettercommunications which help us to contemplate some of the amazingchanges that may take place. This book attempts to provide an understandingof the nature of these changes. It uses case histories to allow acomparative analysis for current and future HVAC systems. It comparesintelligent and non-intelligent devices and assesses the capabilities andlimitations of intelligent devices and their communications.This book shows how to differentiate between the available com-©2001 by The Fairmont Press, Inc. All rights reserved.