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Abstract
Building energy systems are gradually changing from a single form of conventional energies to a multi-energy system that usually includes multiple renewable energy sources. The poor reliability and controllability of renewable energies are likely to cause mismatches between supply and demand, which significantly affect the energy efficiency of the whole building. This paper proposes a systematic methodology for the design optimization of building energy systems integrated by a multiple renewable energy source. A unified mathematical model of multi-energy systems is established based on the concept of energy-hub, in which the core idea is to use a matrix approach to standardize the unified modeling of a variety of building energy processes including energy generation, energy utilization and energy storage. The operating performance of system with different energy sources mixes and system configurations can be effectively predicted. Lifecycle total cost of the entire system, mainly consisting of initial cost and operating cost, is used as the objective function to identify the best design scenarios for sustainable building development. A case study is conducted on the application of the proposed method for optimal design of a typical hybrid renewable energy system in Beijing.
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