Annual Coefficient of Performance Analysis for Chillers Using Different Heat Rejections as Applied to Commercial Buildings

• Main Authors: Po-Chih Hsieh 謝博智, 謝博智
• Other Authors: 蔡尤溪
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/e4uj6z

碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 97 === The air conditioning systems of commercial buildings mostly employ the water-cooled, less with the air-cooled or evaporation-cooled systems. This study introduces the concept of SCOP (System coefficient of performance). The tools for the energy analysis are the DOE 2 eQUEST (Quick Energy Simulation Tool) program. Simulation of annual Coefficient of Performance for chillers using different heat rejections systems are applied to Commercial Buildings. It was found that the power consumption for chillers using different heat rejections are 808,928.6 kWh, 824,587.5 kWh, 750,396.0 kWh, respectively for water-cooled, air-cooled and evaporation-cooled. Then different energy-saving methods were simulated and analyzed. It was found that the VWV system can reduce 1.8~3% of annual energy use, and for VAV system 10~11%. If analyzed and compared for SCOP, the water-cooled is 2.97, the air-cooled is 2.74 and evaporation-cooled is 3.45. In the view of annual energy consumption, when without employing energy-saving measures for air conditioning system of commercial buildings, energy consumption is nearly the same for water-cooled or air cooling type. The study has found that the annual energy consumption and SCOP of evaporation-cooled is better than the other two heat rejection methods.