Energy efficient HVAC systems - 101
The following are examples of energy saving technologies that can be used with most HVAC and Refrigeration systems to reduce energy consumption:
Variable Frequency Drives
Definition: A variable-frequency drive (VFD or VSD) is a device which controls the rotational speed of an alternating current (AC) electric motor by controlling the frequency of the electrical power supplied to the motor. Variable-frequency drives are widely used in ventilation systems for residential and commercial buildings. Variable-frequency motors on fans save energy by allowing the volume of air moved to match the system demand.
Figure 6- An Emerson VFD
Effect on efficiency: "Variable frequency drives installed to reduce air-flow significantly can easily pay for themselves in under a year for a return on investment of over 100 percent." Allient Energy. Variable Frequency Drives Page. 2008 <http://www.alliantenergy.com/docs/groups/public/documents/pub/p012399.hcsp>
Figure 7- An Emerson VFD's (a.k.a. VSD) effect on energy use
XDX Valves
Definition: XDX is a company that produces a patented process which improves the quality of the refrigerant as it flows through the evaporator coil of any HVAC or refrigeration system. This process improves the effectiveness of the refrigerant in the evaporator coil, which results in a reduction in energy use.
Figure 7- Two XDX valves: Mysticool Max & Xstream
Effect on efficiency: A study done by the University of Illinois at Chicago Report stated: 'By using XDX technology, the annualized energy savings were an average of 9.57 kWh to 19.98 kWh per day which equates to a $279.44 to $583.42 reduction in operating costs per year (this figure is based at 8 and 12 cents per kWh respectively).' A 15% reduction in energy usage can be expected with the use of XDX technologies.
XDX technology can improve your system’s performance and save energy. In this tough economy many people are looking for ways to save money and cut costs for their business. Cache Mechanical Systems LLC has teamed up with XDX to focus on improving the quality and effectiveness of your refrigeration and cooling needs, meeting environmental initiatives and saving money by reducing energy usage by at least 15 percent in commercial refrigeration and air-conditioning systems. XDX’s award-winning and scientifically proven products have been installed by a multitude of clients in dozens of industries. Further information can be found at WWW.XDXUSA.COM
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