2022年中考专题训练计算题 .pdf

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1、一、为了推进环保和节能理念的实施，某公司开发生产了“风光互补路灯”，该路灯只需要晒晒太阳吹吹风就能工作，如图l 所示。它在有阳光时通过太阳能电池板发电，有风时通过风力发电机发电，二者皆备时同时发电，并将电能输至蓄电池储存起来，供路灯照明使用。为了能使蓄电池的使用寿命更为长久，一般充电至90左右即停止，放电余留 20左右即停止电能输出。下表为某型号风光互补路灯系统配置方案。问：风力发电机太阳能电池组件最小启动风速1.0m/s 太阳能电池36W 最小充电风速2.0m/s 太阳能转化效率15%最大限制风速12.0m/s 蓄电池500Ah-12V 最大输出功率400W 大功率 LED 路灯80W-12

2、V 1当风速为60ms 时，风力发电机的输出功率将变为50W，在这种情况下，将蓄电池的电量由20充至 90需多长时间?2如果当地垂直于太阳光的平面得到的太阳辐射最大强度约为240Wm2，要想太阳能电池的最大功率达到36W，太阳能电池板的面积至少要多大?3若遇到阴天无风的天气，仅靠蓄电池供电，最多可供灯具正常发光多长时间?二、电动自行车是倍受人们青睐的一种交通工具，如图所示。其主要结构就是在原来的普通自行车的基础上，增加了电动机及供电、传动设备，它可以电动骑行，亦可以脚踏骑行。电动骑行时，蓄电池为车上的电动机供电，电动机为车提供动力；脚踏骑行时，与普通白行车相同。下表是某型号电动白行车主要技术参

3、数。整车整车质量40kg 最高车速30km/h 最大噪声62dB 蓄电池电压48V 容量12Ah 电动机额定电压48V 额定功率240W 1仔细观察电动自行车的构造，会发现很多地方用到了物理知识。请仿照下面的示例，再列举三处应用物理知识进行设计的事例。示例：电动自行车的车座大而扁平，可减小压强。答：(1)(2)(3)2当一个初三学生骑着电动自行车在平直的公路上匀速行驶时，轮胎与地面的总接触面积约为40cm2，此时路面受到的压强约为多大?3电动自行车以额定功率行驶时通过电动机线圈的电流是多大?4蓄电池充足电后储存的能量是多少?5在蓄电池充足电后为电动机供电的过程中，当把储存能量的80提供给电动机

4、后就应进行充电。若电动机工作时将电能转化为对自行车输出机械能的效率为75，电动自行车在平直的公路上匀速行驶时受到的阻力为30N，则蓄电池充一次电最多能完全依靠储存的电能连续行驶多远?6从环保的角度来看，与摩托车相比，电动自行车有什么优缺点?(各列举一条)图 1 三、家用燃气快速热水器是一种方便、快捷且不受天气影响的洗浴设备。下表为某品牌家用燃气快速热水器的主要技术数据。已知天然气的热值为8107Jm3，水的比热容为4.2x103J(kg)。生产许可证XK00-1020044 执行标准GB6932-2001 型号JSD-D8JA 燃气种类天然气额定燃气压强2000Pa 额 定 热 负 荷16kW

5、 适用水压0.025MPa0.75MPa 额定产热水能力8L/min(t=25K)额定电压3V(DC)1为安全使用此热水器，机体上印有一些警告，其中一条是这样说的：“气温低于0时，用后请打开放水塞，放尽机体内存水，再拧紧”。请解释为什么要这样做?2试求该型号家用燃气快速热水器正常工作时的烧水效率。3若在额定产热水能力下进行淋浴，一次淋浴总计加热时间为20min，则此次淋浴至少需消耗多少天然气?4为防止燃气热水器在无水或水压过低时“干烧”，技术人员设计了很多种“水气联动”装置，实现通常所说的“水到气到”。图 4 就是其中一种“水气联动”装置的原理图，你能看出它的工作原理吗?请简述它是如何利用“水

6、到”来控制“气到”的。5为了防止热水器工作过程中加热火焰意外熄灭导致燃气泄漏，技术人员设计了“火灭断气”的装置。如图5 所示为一种“火灭断气”装置的原理图，请根据这个原理图，简述它是怎样实现“火灭断气”功能的?四、小芳家里新买了一台电热水器，从“用户手册”中，她获得了以下资料，请根据这些资料完成相应的计算：一、外形尺寸(mm)A B C D E F 781 100 196 196 353 434 二、技术数据额定功率/W 1000/1500/2500 额定压力/MPa 0.8 额定电压/V 交流 220 容积/L 50 频率/Hz 50 净重/kg 19 1下图为安装示意图，安装时要将L 形挂

7、钩用膨胀螺钉固定在承重墙上，上表是热水器的部分数据，请估算L 形挂钩受到的最大向下拉力F 及对应此时膨胀螺钉与承重墙体间的摩擦力f.2这台热水器共有三挡加热功率，销售人员曾介绍说：热水器内部有两个加热管。请文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V

8、4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J

9、5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A

10、8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:

11、CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10

12、V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X

13、5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E

14、7L3W6V4 ZZ9J5Q5A7A8你根据销售人员的介绍，猜测并画出内部加热电路的主要结构(简化的等效电路图)。然后依据你的猜想，计算出每个加热管的电阻值。3产品说明书上标明：当达到设定温度，停止加热后，如果水温降到低于设定温度4时，热水器将自动以设置功率将桶内的水加热至设定温度，如此反复直至手动停止加热。小芳想到了国家提倡的峰谷电价制度的有关规定：2011 年起，本地的分时电价为：峰时段(08：00 22：00)06 元度，谷时段(22：00次日 08：00)03 元度。她想，如果每天下午6 点洗浴时需要把20的冷水加热至50，可以下午直接加热，也可以早晨8 点前加热好，让热水器自动保温至

15、下午6 点，哪种方式更省钱呢?为此她利用热水器提供的测温功能测量了水温从50降至 46需要 190 分钟，已知c水=4.2103J(kg)，请帮她通过计算做出哪种方式更省钱的判断。文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8

16、文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:C

17、R2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V

18、10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5

19、 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7

20、L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4

21、 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5

22、Q5A7A8参考答案一、1需要时间12 500 3600(90%20%)8450WtshP2电池板面积2236=1%PSmmP电辐240 153可供灯具发光时间125003600(90%20%)52.580WtshP灯灯二、1电动自行车的踏板很大，可减小压强。电动自行车的把手凹凸不平（有花纹），可增大摩擦电动自行车的车把很长，可省力2假设骑车人的质量约为60kg，则地面受到的压强：3额定功率下的电流240548PWIAUV4蓄电池储存的电能E=UIt=48V 12A 3600s=576Wh=2.0736 106J 5因为电动自行车匀速行驶，所以W=W总80%=576Wh80%=460.8Wh

23、W有=W=460.8Wh75%=345.6Wh 根据二力平衡F=f=30N 6优点：不会排放废气，噪音小缺点：蓄电池使用一定时间后就需更换，废弃后的电池易污染环境。三、1 气温低于O时使用后的燃气热水器中的残存的水会结冰。水站冰后，密度变小 体积涨大这样很容易把燃气热水器胀破。所以，气温低于O 时使用燃气热水器后应打开放水塞放尽机体内存水，再拧紧。21min 中：文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ

24、9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A

25、7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编

26、码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L

27、10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X

28、5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH

29、1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W

30、6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A83516 10609.6 10QP tWsJ放额1min 内加热的水的质量：1/8/min1min8mVkg LLkg水温上升 t=25K=25 1min内水吸热：30054.2 10/()8258.4 10Qcm tJkgCkgCJg吸 1 分燃气热水器正常工作时烧水的效率558.4 10100%=100%87.5%9.6 10QJQJ吸放3一次淋浴所需燃料燃烧放出的热量：3716 1020 60

31、1.92 10QPtJJ放需要完全燃烧天然气的体积为：73731.92 100.248 10/QJVmqJm放4当进水口处有水压时膜片的右面就会受到向左的压力，克服弹簧的弹力向左推动阀杆 打开进气阔门使燃气进入主火管通。反之如果此时的水压很小或者无水，则膜片受到的向左的压力就会减少甚至消失。燃气阀门就会在弹簧的压力下向右移动而关闭停止进气。5火焰燃烧时双金属片外侧的金属温度升高时膨胀的更多，双金属片向下弯曲，推动燃气阀门打开；如果因为意外的原因使火焰熄火，双金属片的温度降低外侧金属收缩的更多，双金属片向上伸直，拉动拉动燃气阀门关闭，防止燃气外泄。四、1电热水器总重19 1050 1 10690

32、Gm gVgNNN总净水电热水器挂在L 形挂钩上时，其受力情况如图答-2 所示。因电热水器静止，所以沿竖直方向二力平衡，因此对L 形挂钩向下的拉力690FGN总因 L 形挂钩静止，电热水器上端所受的水平向左的拉力等于膨胀螺丝所受的摩擦力，以悬挂下端为轴，根据杠杆平衡条件有CfDG g总690196690196GCNmmfNDmmg总2由热水器的三档功率的数值关系猜得热水器加热部分的等效电路图如图答-3 所示，其中加热管R1的额定功率为1000W，电热管R2的额定功率为1500W。加热管的电阻分别为文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR

33、2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V1

34、0X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5

35、HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L

36、3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4

37、ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q

38、5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文

39、档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A82211(220)48.41000UVRPW2222(220)32.31500UVRPW3（1）忽略加热过程中的热损失，直接加热消耗的电能为：300061114.2 10/()50(5020)6.3 101.75WQcm tJkg CkgCCJkWh下午加热的电费支

40、出为：0.6 元/kWh 1.75kWh=1.05 元（2）早晨 8 点前加热，电费支出为：0.3 元/kWh 1.75kWh=0.525 元加热升温4所需电能300052224.2 10/()50(5046)8.4 10WQcm tJkg CkgCCJ加热升温4所需时间（设加热功率为2500W）：T1=W2/P3=336s=5.6min（这段加热时间可以忽略不计）降温 4所需时间为190 至下午 6 点共需要三次加热，消耗电能：W3=3W2=3 8.4 105J=2.52 106J=0.7kWh电费支出为：0.6 元/kWh 0.7kWh=0.42 元总支出为：0.525 元+0.42 元=

41、0.945 元因此，第二种方案更省钱。文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V

42、4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J

43、5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A

44、8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:

45、CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10

46、V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8文档编码:CR2L10V10X5X5 HH1E7L3W6V4 ZZ9J5Q5A7A8