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聚焦在冷凝器上!

作者:Richard Hawkins, MACS撰稿人

在上周的文章中, kok体育安卓版下载专注于应用温度测试的蒸发器在一个孔管系统.  在它中,kok体育安卓版下载说明了如何和为什么在蒸发器中的低液位可以导致进口和出口之间的大温差.  kok体育安卓版下载还指出了提高液位会使温度差减小的方式和原因.  现在是集中在冷凝器上的时候了.

There has been some information written over the years that indicates that the condenser temperature differential on both orifice tube and expansion valve systems should be in the range of about 20° to 50°.  That information pointed out that a temperature differential of greater than 50° would point toward either a refrigerant undercharge or a restricted condenser.  如果温度差小于20°,则说明制冷剂充注过多或传热不足.  注意:这是假设系统中没有任何其他问题.

根据kok体育安卓版下载最近几年做的一些测试, that information seems to have been written about systems that use fixed displacement compressors as our tests confirmed that altering the refrigerant charge on those systems can have a dramatic effect on the temperature differential.  请看下面的图片#1和#2.  

然而, vehicles with variable output compressors (especially electronically controlled variable displacement units) will often have condenser inlet and outlet temperature differentials which fall outside of those ranges.  kok体育安卓版下载谈论的是收费合理的完美操作系统,而不是有问题的系统.

在孔板管系统上进行温度测试,该系统有一个固定排量的压缩机,运转时负荷正确.  1.蒸发器上的3°差值是可以接受的,而39°差值是可以接受的.冷凝器上的2°差值在20°到50°范围内,这是上面提到的.

几分钟后,同样的系统被测试,电量减少了25%.  蒸发器的差值增加到32.1°,冷凝器差值增加到62.8°,远远超出了上面提到的50°.

 我亲自测试了许多低里程车辆的电子控制可变排量压缩机,这已适当充电, 完美的操作系统,发现冷凝器的差值在55°到75°之间. 

MACS also did test on some other vehicles with electronically controlled variable displacement compressors with systems which were properly charged and operating perfectly and found very low condenser temperature differentials (in the 10° to 15° range).  既然如此, it is recommended that extreme caution be utilized when temperature testing these systems and arriving at a diagnostic conclusion and considering replacing a condenser.  请看下面的图片3.

Condenser temperature differentials like these are often encountered on properly charged perfectly operating systems that use electronically controlled variable displacement compressors.

在技术热线电话中最常见的问题之一是:你正在工作的系统中有多少制冷剂?  kok体育安卓版下载将在下周讨论这个问题的一些有趣的答案.

有人对“把注意力放在冷凝器上。!”

  1. 托马斯·莱赫 说:

    冷凝器是一个热门话题,当一个技师不知道汽车售后有一个质量差的冷凝器安装.
    我每周都会看到这样的场景. 为了进行准确的测试,冷凝器必须是OEM或至少几乎完全匹配售后市场的“每英寸鳍片数量”
    “制冷剂通道管数”
    Mini aftermarket condensers leave off those foam strips that are glued on the top in the bottom or the side that block hot under hood heated air from rolling back around from the engine compartment back in front and reheating the condenser another large problem.
    甚至“冷却通道内翅片的数量和内部尺寸”

    如果你不幸得到了一个低质量的售后冷凝器,并试图运行你的测试,你会得到一些非常糟糕的数字在炎热的天气

    但在温和或凉爽的天气里,你几乎看不到任何区别.

    I’ve been called into shops or had customers cars come to me where compressors have been replaced expansion valves have been replaced receiver dryers have been replaced or fixed tubes have been replaced all by not knowing what was going on and technicians just stabbing at wild guess throwing darts at the wall and see what sticks replacement method.

    唯一的问题是劣质的售后冷凝器替换它与OEM和汽车将在炎热的天气完美冷却.

    在一些混合动力汽车上安装了质量低劣的售后冷凝器. 如果冷凝器是在冬季的时候在车身车间发生碰撞后更换的,那么客户在冬季不会注意到有什么不同.
    What time in spring time or summer time the customer will complain of poor gas mileage because the engine is running all the time because the high side pressure is so high the electric compressor is drawing a lot of amps from the high voltage battery. Constantly draining the high-voltage battery cycling the battery much more often than it was designed to be drained and recharged and the engines are always turning back on to recharge the battery.

    So the customer thinks they need a tuneup and bring it to a mechanic shop and parts start getting replaced checking fuel system parts ignition system parts spark plugs a whole bunch of wild guessing starts going on and replacing parts for this poor gas mileage condition sometimes rough engine idle on small displacement gas powered engine cars.
    和原因 ? “劣质的售后冷凝器安装”花费了客户数百美元,有时数千美元在不必要的零件更换.

    我想就这个月吧 , 我可能已经发布了半打视频坏售后冷凝器回来的车身商店.

    很多心烦的客户心烦的车体店老板都被保险公司告知要使用售后冷凝器, And not so happy insurance company adjusters and supervisors when I give them a second fill for having to diagnose find a leak the first time customer have to go into a rental car again part has to get ordered front bumper front of vehicle taken apart to re-move the bad aftermarket condenser and replace it with an OEM and then if it’s a R1234YF vehicle they get my astronomically large recharge bill at second tiime.

    I had one large range rover with the dual air conditioning evaporator’s that was nearly 3+ pounds R1234YF I believe with a total cost approaching $600 for a recharge. 冷凝器连续两次泄漏,所以在他们安装OEM冷凝器之前,我总共进行了三次充电.
    And every time they called me out to re-diagnose define why it wasn’t working was a minimum $173 just to look at the vehicle and drive out to it on top of the recharge cost.

    所有这些都是由于售后冷凝器质量差造成的.

    On all my work orders and I am a direct vendor for mechanical shops or body shops when I see a poor quality aftermarket condenser that is grossly under fined . 例子. If the condenser comes with 21 cooling fins per inch and the aftermarket replacement condenser only has 16 cooling fins per inch you’re probably going to have a problem on a very hot summer day.
    最重要的是,如果工厂的冷凝器有58个制冷剂冷却通道 . The aftermarket condenser only had 46 refrigerant cooling passages on top of it having fewer fins per inch you’re going to see some really unusually high side pressure on very hot days.

    Not to mention on a hybrid vehicle or a electric vehicle the hybrid the gas engine will probably never shut off because of the high amp draw on the compressor

    我看到100%电动汽车的电池续航里程极短,高压电池续航里程极短.

    这是一个需要研究、讨论和揭示的话题.

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