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This paper describes the passive design strategies of Sunny Inside, which is a zero-energy solar house designed to participate in Solar Decathlon China 2013. Ecological atrium design, shading design, natural ventilation design, heat storage system design and thermal insulation design of Sunny Inside are introduced and analyzed respectively. The discussion of the building's energy performance is based on the measured and simulated data by using several building simulation softwares in the study. Ecotect software is used to optimize the house's shading design through simulating the shading conditions. Phoenics software is used for simulating the natural ventilation design of Sunny Inside. Designbuilder software is used in building envelope design to analyze the building's energy consumption. The results show that Sunny Inside is reasonable in passive energy efficiency design.

This paper presents the design strategies and energy performance of a net-zero energy house (NZEH), Nature Between, which was designed and built to participate in the Solar Decathlon China 2018 competition. The specific parts of the design strategies for Nature Between, including architectural concept, materials, passive strategies and active strategies, are introduced and analyzed. This study includes a discussion of the building's energy performance based on the measured data gathered in Dezhou, where the competition was held. And also the annual energy simulation using Energyplus software based on the climate of Xiamen, where the prototype was located in. The results show that the design strategies are reasonably applied in Nature Between to achieve the goal of zero energy consumption in Dezhou and Xiamen. Pleasant indoor environment and flexible spaces are achieved in the house using natural material, which embodies the concepts of sustainability and natural philosophy. The practical strategies provided in this paper could help the architecture designs for residential NZEH.