Abstract
In order to compare the design of hybrid energy systems for on-grid and off-grid applications, a university dormitory in central China is selected and investigated to achieve the target of a zero energy dormitory. The building is modeled in DeST and hybrid system design optimization is performed in HOMER. Results show that the on-grid hybrid system under time-of-use rate policy is much more economic than that under single rate policy for on-grid case. The total net present cost is 230,534 $ and the levelized cost of energy is 0.124 $/kWh. The off-grid system with generators is more economical than system without them, and the cost is found to be about 6 times than on-grid system. Sensitivity analysis is performed by considering sell-back price and diesel price, it is found that NPC and COE can be increased by 9.7% and 12.7% for the decreased sell-back price and doubled diesel price respectively.
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