SINGLE ZONE CASE STUDY The intent of this case study is to allow an understanding of a significant problem relating to the Heating, Ventilation and Air Conditioning (HVAC) industry. The issue addressed involves simultaneous heating and cooling, due to poor design, installation and commissioning of control systems. This paper's intent is promotion of a thorough understanding relating to the problem, enabling one to address similar situations as they are encountered. A significant quantity of greenhouse gas (GHG) enters our atmosphere directly relating to poor control arrangements as illustrated in this case study. This case study is presented in four steps: (1)- The fan system is considered manual as illustrated in drawing one. What are you manually controlling? What are your target conditions? How would you logically adjust the operations? (2)- The original design is illustrated in drawing two. We identify the design problems. (3)- The design was altered, as per drawing three, by a representative of another large control company. We identify the design and commissioning problems. The energy performance relationship is illustrated. The performance of this arrangement is graphically illustrated from data collected before we altered any controls. (4)- Drawing four is the same as drawing three except the preferred energy use relationship is illustrated. (5)- Drawing five illustrates the control arrangement that will achieve the same common sense control you concluded in your manual operation on drawing one. The performance of this arrangement is graphically illustrated. (6)- An energy use comparison is drawn via the two performance graphs. The 49.74% energy reduction enjoyed relates to the specific load conditions. Based on practical experience, the alterations applied to this system normally produce reductions in the range of 15% to 25% annually. (7)- Remember, if the control system is not making the same common sense, device positioning decisions as an intelligent person, with identical information input, there is something wrong with the control system! 8.65
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