中等容量三相功率因数校正技术的发展

功率因数校正(PFC)技术是目前电力电子研究的热点之一。对于不同功率容量的装置,其采用的PFC技术都有各自的特点,文章介绍了当前中等容量(5～10kVA)三相PFC技术发展的一些情况。

谈中等容量激活学生课堂兴趣的作用

许多老师在课堂上进行“大容量”的知识讲解和学习,想以此达到一优“教优学”的目的,但却导致越来越多的学生产生愈来愈强的厌学情绪,针对此种现状,本文大呼“中等容量”并提出其在实际和课堂教学中激活学生兴趣的重要作用。

A Proposal for Reservoir Volume Calculation in Rainwater Harvesting Systems

This paper introduces a proposal for reservoir volume calculation in rainwater harvesting systems. The proposed method can be used for reservoir volume design in rainwater harvesting systems and is based on three important variables. These variables are water demand, system efficiency and repayment time. Several simulations were carried out in different scenarios considering typical values of both catchment area （for low-income and medium-income households） and water demand, with fixed water and tank costs. Results showed that the integrated analysis of demand, efficiency and repayment time may assist designers to determine a more adequate reservoir volume.

没有污染的能源太阳能

一、从火力发电厂谈起火力发电厂有个听来颇为赫然的外号,叫“大煤老虎”。一座50万千瓦中等容量的火力发电厂,一小时之内就要烧掉270吨煤,一天则是6480吨,一年可就要237万吨了!称之为“大煤老虎”,实属当然。烧掉这么多煤,自然就要排出大量的废渣废气。根据推算,就是这么一座中等容量的“大煤老虎”,一小时之内就要排出灰渣废物70吨。