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Several common faults and their causes in variable air volume (VAV) air conditioning system are presented, and the principle of fault diagnosis of air conditioning system is briefly described. The VAV air conditioning system was modeled in TRNSYS, and five typical faults of the cooling mode were simulated. The comparative analysis of the respective under normal operation and fault operation had been...
The hydraulic stability of the variable water volume air conditioning system has a significant impact on the thermodynamic stability, service life of the pipe network and energy consumption. The hydraulic stability of variable water volume air conditioning system was investigated by means of experiments. An air conditioning system with variable water volume is served as the platform, and then the...
A large-aperture low-sidelobe broadband wide-angle scanning system based on completely overlapped subarrays has been presented. The subarray ports use 40-dB Taylor distribution and elements use uniform excitation. A large-aperture array having more than 16 subarrays have an exactly low-sidelobe Taylor pattern. Within a certain range, the bandwidth has linear correlation with subarray size. A smaller...
A Ka-band left-hand circularly polarized crank-line microstrip antenna is designed by HFSS. The operating frequency of antenna is 29.4–31GHz, using microstrip series-fed mode, the input impedance is 50Ω. The maximum gain of the center frequency of 30.2GHz is 11.8 dB, and 3-dB axial-ratio bandwidth is up to 10.9% (28.5–31.8GHz). The results show a better axis ratio of 2dB and VSWR of less than 1.25...
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