Utilizing renewable energy systems (RES) is an important part of the design and development of greenbuildings. However, it is unreasonable to assess renewable energy utilization (REU) only with the netratio of renewable energy earning to a buildings total energy consumption, while ignoring the systemefficiency of RES with the additional conventional energy consumption, such as electricity. In this paper,the energy quality coefficient (EQC) is introduced to describe the quality of energy, while the energyconversion coefficient (ECC) is applied to evaluate energy system efficiency.
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