In this paper,a multifunctional chiral metasurface is presented to achieve asymmetric transmission(AT)and linear-polarization conversion(LPC).The designed metasurface consists of a cross swords-like shape and two hole...In this paper,a multifunctional chiral metasurface is presented to achieve asymmetric transmission(AT)and linear-polarization conversion(LPC).The designed metasurface consists of a cross swords-like shape and two holes in the lower side of the unit cell.In the frequency band from 8.3 GHz to 10.4 GHz,AT is realized with more than 90%efficiency and the same chiral metasurface transforms linear polarized wave into its orthogonal counterpart with high efficiency.For LPC,the polarization conversion ratio(PCR)is greater than 95%.The proposed metasurface is stable against the incident angles of striking electromagnetic(EM)waves up to 60°for both operations of AT and LPC.展开更多
溶液除湿与热泵混合(liquiddehumidificationandheatpumphybridsystem,LDHP)系统、温湿度独立控制(temperature-humidity independent control system, THIC)系统以及传统热泵(heat pump system, HP)系统是目前研究较多的空调方式。该...溶液除湿与热泵混合(liquiddehumidificationandheatpumphybridsystem,LDHP)系统、温湿度独立控制(temperature-humidity independent control system, THIC)系统以及传统热泵(heat pump system, HP)系统是目前研究较多的空调方式。该文通过构建3种空调方式的理想可逆过程,采用数值模拟的方法研究了上述系统的性能系数能达到的理论最大值。并对送风温差、热湿比和室内外环境空气参数的变化对系统性能系数的影响展开研究。结果表明,理想情况下增加送风温差或降低热湿比均会导致系统性能系数降低,且3种系统性能系数受送风温差影响更为明显。3种系统的性能系数均随着室内设计温度或相对湿度的增加而增大,在整个模拟范围内增长近1倍;而室外环境温度或相对湿度增加均会使3种系统性能系数(coefficient of per formance, COP)降低;其中室内外温度变化对系统性能系数影响较相对湿度更为明显。在模拟条件下,LDHP系统的性能系数均是最大,HP系统次之,THIC系统最低。该文研究成果对此3种空调方式的选择及优化提供了理论依据。展开更多
文摘In this paper,a multifunctional chiral metasurface is presented to achieve asymmetric transmission(AT)and linear-polarization conversion(LPC).The designed metasurface consists of a cross swords-like shape and two holes in the lower side of the unit cell.In the frequency band from 8.3 GHz to 10.4 GHz,AT is realized with more than 90%efficiency and the same chiral metasurface transforms linear polarized wave into its orthogonal counterpart with high efficiency.For LPC,the polarization conversion ratio(PCR)is greater than 95%.The proposed metasurface is stable against the incident angles of striking electromagnetic(EM)waves up to 60°for both operations of AT and LPC.
文摘溶液除湿与热泵混合(liquiddehumidificationandheatpumphybridsystem,LDHP)系统、温湿度独立控制(temperature-humidity independent control system, THIC)系统以及传统热泵(heat pump system, HP)系统是目前研究较多的空调方式。该文通过构建3种空调方式的理想可逆过程,采用数值模拟的方法研究了上述系统的性能系数能达到的理论最大值。并对送风温差、热湿比和室内外环境空气参数的变化对系统性能系数的影响展开研究。结果表明,理想情况下增加送风温差或降低热湿比均会导致系统性能系数降低,且3种系统性能系数受送风温差影响更为明显。3种系统的性能系数均随着室内设计温度或相对湿度的增加而增大,在整个模拟范围内增长近1倍;而室外环境温度或相对湿度增加均会使3种系统性能系数(coefficient of per formance, COP)降低;其中室内外温度变化对系统性能系数影响较相对湿度更为明显。在模拟条件下,LDHP系统的性能系数均是最大,HP系统次之,THIC系统最低。该文研究成果对此3种空调方式的选择及优化提供了理论依据。
