Capacity-Power Consumption and Energy-Efficiency Evaluation of Green Wireless Networks

In this paper,we discuss in detail the basic issue of green design and consider an energy efficiency function as the metric to evaluate green cellular networks.Specifically,we investigate the transmit power required for an expected transmission capacity and propose a capacity-power formula based on the energy conservation and the Shannon capacity theorem.Two novel definitions of cell interference depth and handoff dynamic model are introduced and the corresponding expression of energy efficiency function is derived.Numerical results show that the energy efficiency function is closely correlated with the transmitted/received power required and the cell radius.Our work provides a useful basis for research and evaluation on green design and technology of cellular networks.

不同供暖时间比对间歇供暖房间内围护结构能耗的影响

为了探究夏热冬冷地区冬季内围护结构在不同供暖时间比下的能耗特征,本文通过数值模拟的方法,对外墙内、外保温方式下的间歇供暖房间内围护结构的传热过程及能耗特点进行分析。结果表明,供暖时间比λ越大,房间的平均热指标越小;不同供暖时间比时,内围护结构的能耗比都很大为75%左右;当供暖时间比减小时,内墙的无效能耗源比增加,最大为70%左右。