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Fundamental Series ltem :HVAC Systems: How They Work <br />file)//cVwindows/TEMP/0,2637,14506,0 <br />17 <br />the mixed air) into the refrigeration system. The newly "chilled" water leaves the eval <br />goes through the chilled water pump (CHWP) and is pumped through the chilled wa1 <br />(CHWS) piping into the cooling coil to pick up heat from the mixed air and the water <br />repeats. <br />The evaparatar is a heat exchanger that allows heat from the CHWR to flow by cons <br />the refrigerant tubes. The liquid refrigerant in the tubes "boils off' to a vapor removin <br />the water and conveying the heat to the compressor and then to the condenser. The <br />the condenser is conveyed to the cooling tower by the condenser water. Finally, outs <br />drawn across the cooling tower, removing the heat from the water through the prose <br />evaporation. <br />An HVAC system is simply a group of components working together to move heat to <br />wanted (the conditioned space) or to remove heat from where it is not wanted (the c~ <br />space) and put it where it is unobjectionable (the outside air). <br />Samuel C. Manger, CEM, CDSM, is the principal of the energy systems training firm, <br />Monger Worldwide Consulting. The author of numerous articles and books on perforr <br />testing and evaluation of HVAC/R systems, Monger is a nationally recognized energy <br />systems educator and enerav enaineerina orofessional_ <br /> <br />Copyright ©2000 by Business News Publishin Co. <br />