Firstly, the influence of building design factors on building carbon emissions was analysed, and the influence of building form factor, building orientation and building envelope on building carbon emissions was simulated and studied, which shows that the south-facing direction has the lowest building carbon emissions, the external window shading factor is negatively related to building carbon emissions, and all other factors are positively related to building carbon emissions. The existing low carbon evaluation systems were then analysed, most of which suffer from a lack of carbon emission calculation methods and a lack of comprehensive scoring methods. This paper establishes an evaluation index system based on the principles of evaluation system construction, determines the benchmarks for index evaluation based on energy saving standards and research data, delineates the range of evaluation index parameters and the percentage of scores, and establishes an evaluation index system. The weights of the evaluation indicators were calculated using hierarchical analysis and combined with expert questionnaires, and a comprehensive scoring method was established based on the weights to build a building carbon emission evaluation system.

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This paper will investigate the stability of the compressor with circumferential inlet distortion. An experimental method has been implemented on a transonic axial flow compressor with uniform and three different levels of circumferential distortion inflow intensity. The distortion is introduced by a well-designed gauze upstream of the rotor. Dynamic transducers and steady-state probes have been mounted in multiple locations to monitor the stall event. From previous studies, the circumferential inlet distortion usually increases the stall point mass flow rate. As these papers have shown, it is expected that the stall point mass flow rate increase as the intensity of distortion increases. An unexpected result, however, indicates a smaller stall point mass flow rate in distortion cases when compared to uniform cases. In light of this result, this paper demonstrates the evolution of instability in circumferential distortion conditions and analyses them to explain the reason behind the smaller stall point mass flow rate. The circumferential distortion can alter the development of the stall event. The reduction in the stall point mass flow rate is related to the stall inception of this compressor. In the uniform case, the stall inception is the partial surge originating from the stator hub. In the distortion cases, various unsteady phenomena occur at the stator hub as the compressor approaches the stall point. Those disturbances, however, fail to induce the compressor to stall. In the end, the propagation of spikes can be observed in the record of unsteady pressure transducers mounted on the rotor casing wall, which trigger the whole compressor stall. The decrease of stall point mass flow rate between the uniform case and distortion cases is due to the transformation of stall inception from partial surge to spikes.