Energy and economic evaluation of cooling,heating, and power systems based on primary energy |
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| Authors: | Nelson Fumo Pedro J Mago Louay M Chamra |
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| Affiliation: | 1. Department of Family and Preventive Medicine and Cancer Prevention and Control Program, University of California, San Diego, La Jolla, CA;2. Texas Tech University Health Sciences Center, Paul L. Foster School of Medicine, El Paso, TX;3. Department of Family and Preventive Medicine and Cancer Prevention and Control Program, University of California, San Diego, La Jolla, CA;4. Department of Medicine, University of California, San Diego, La Jolla, CA;5. Psychology Service, Veteran Affairs San Diego Healthcare System, San Diego, CA;6. Department of Psychiatry, University of California, San Diego, La Jolla, CA;7. Exercise and Physical Activity Resource Center, University of California, San Diego, La Jolla, CA;1. Division of Cardiology, Department of Internal Medicine, Mackay Memorial Hospital, Taipei, Taiwan;2. Department of Medicine, Mackay Medical College and Mackay Medicine Nursing and Management College, Taipei, Taiwan;3. Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan;4. Institute of Clinical Medicine and Cardiovascular Research Centre, National Yang-Ming University, Taiwan;5. Division of Cardiology, National Yang Ming University Hospital, I-Lan, Taiwan;1. Department of Physics and Astronomy & Rochester Theory Center, University of Rochester, Rochester, NY 14627, USA;2. Institute for Quantum Studies, Chapman University, 1 University Drive, Orange, CA 92866, USA;1. Department of Obstetrics and Gynecology, University of Colorado School of Medicine, Aurora, CO;2. Department of Obstetrics and Gynecology, Denver Health Medical Center, Denver, CO;3. Department of Biostatistics and Informatics, Colorado School of Public Health, University of Colorado, Denver, Denver, CO |
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| Abstract: | Cooling, Heating, and Power (CHP) systems have the potential to make better use of fuels than other technologies because of their ability to increase the overall thermal energy efficiency. Feasibility of CHP systems is generally driven by economic savings. In addition, economic evaluation of CHP systems is based on site energy use and cost, which could lead to misleading conclusions about energy savings. Since energy savings from CHP systems only occurs in primary energy, the objective of this investigation is to demonstrate that feasibility of CHP systems should be performed based on primary energy savings followed by economic considerations. This paper also evaluates the effect of the power generation unit (PGU) efficiency over the primary energy reduction when a CHP system is utilized. The advantages of operating CHP systems under a primary energy operational strategy, such as the proposed Building Primary Energy Ratio (BPER) strategy, are also discussed. Results show that for some cases economic savings are attained without the corresponding primary energy savings. However, the use of the BPER operational strategy guarantees better energy performance regardless of economic savings. Regarding to the PGU efficiency, an increase of the efficiency reduces the primary energy use more than proportionally. For example, increasing the PGU efficiency from 0.25 to 0.35 (increase of 40%) can reduce the primary energy use from 5.4% to 16% (increase of 200%). |
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