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标题: 如何计算直流电功率？ [查看完整版帖子] [打印本页]

时间: 2007-5-18 08:02

作者: 问道 标题: 如何计算直流电功率？

<p>为进一步控制成本，俺们这要核查每个月机房设备用电量，给出一个交流计算公式<span lang="EN-US" style="FONT-SIZE: 14pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">

=I</span><sub><span style="FONT-SIZE: 14pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">相</span></sub><span lang="EN-US" style="FONT-SIZE: 14pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">U</span><sub><span style="FONT-SIZE: 14pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">相</span></sub><span lang="EN-US" style="FONT-SIZE: 14pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">cosΦ，我这只有直流电，怎么计算机呢？例如，直流电压53.6V，电流41A，那么一个月用电是多少度呢？</span></p>

时间: 2007-5-18 08:17

作者: gwgz

<p>直流功率计算公式： P＝V x I     相当于交流功率 cos<span style="FONT-SIZE: 13pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><strong>φ ＝ 1，<span style="FONT-SIZE: 13pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">φ＝0的情况。</span></strong></span></p><p><span style="FONT-SIZE: 13pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><strong><span style="FONT-SIZE: 13pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">用电量是以交流电衡量，交流功率 x 转换系数（AC/DC转换效率）＝直流功率</span></strong></span></p><p><span style="FONT-SIZE: 13pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><strong><span style="FONT-SIZE: 13pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">                即：交流功率＝直流功率 / 转换系数（AC/DC转换效率）</span></strong></span></p><p><span style="FONT-SIZE: 13pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><strong><span style="FONT-SIZE: 13pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"></span></strong></span></p><p><span style="FONT-SIZE: 13pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><strong><span style="FONT-SIZE: 13pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">            效率一般应该大于等于0.75吧，好的可以达到0.95，可以大致选一个0.8什么的估算一下，应该就可以了，这个值具体取决于选用的变压器。</span></strong></span></p><p><span style="FONT-SIZE: 13pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><strong><span style="FONT-SIZE: 13pt; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"></span></strong></span></p><p></p>

时间: 2007-5-25 17:29

作者: lawyer0101

<p>楼上说得对，现在开关电源一般都有PFC电路，效率都比较高，如果不是负载较小，我们测量过，一般都应该在0.9以上，取0.9吧；负载理想，效率会在0.9以上。</p>

时间: 2007-5-26 16:16

作者: happyyou

好!谢谢!

时间: 2007-5-28 03:38

作者: X-cq

不错，学习了

时间: 2007-6-1 09:13

作者: 278043601

<p>转换系数由厂家定还是通过自己计算得啊？</p>

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