Jinan Benz car maintenance: as the weather gets warmer and warmer, many friends must use the weekend to drive around. If the distance is relatively long, you can't avoid running on the high-speed. Now some car owners should have questions: when running on the high-speed, does it cost oil to turn on the air conditioner or to turn on the windows?

開(kāi)冷風(fēng)為什么費(fèi)油？

Why does it cost oil to turn on the cold air?

汽車空調(diào)的制冷系統(tǒng)雖然跟家用空調(diào)在結(jié)構(gòu)上有差異，但它們有一點(diǎn)是一樣的，都是通過(guò)壓縮機(jī)把氣態(tài)制冷劑進(jìn)行壓縮，然后釋放出熱量。

Although the refrigeration system of automobile air conditioner is different from that of household air conditioner in structure, they have one thing in common. They compress the gaseous refrigerant through the compressor and release heat.

汽車的空調(diào)壓縮機(jī)需要靠發(fā)動(dòng)機(jī)提供能量進(jìn)行工作，這就等于無(wú)形中增加了發(fā)動(dòng)機(jī)的負(fù)荷，這就是夏天開(kāi)冷風(fēng)費(fèi)油的主要原因。

The air-conditioning compressor of the car needs to work with the energy provided by the engine, which is tantamount to an invisible increase in the load of the engine, which is the main reason for the fuel consumption of cold air in summer.

特別是低轉(zhuǎn)速狀態(tài)下，發(fā)動(dòng)機(jī)在保證不熄火的情況下還要給空調(diào)壓縮機(jī)分配一定的動(dòng)力，所以當(dāng)A/C按鍵點(diǎn)亮?xí)r，汽車的怠速會(huì)比不開(kāi)空調(diào)高一點(diǎn)。

Especially in the low speed state, the engine will distribute certain power to the air conditioning compressor under the condition of ensuring that the engine does not shut down. Therefore, when the A / C button is on, the idle speed of the car will be a little higher than that without the air conditioning.

首先有個(gè)觀點(diǎn)必須清楚，就算汽車再高級(jí)，高速行駛的時(shí)候也不可能一點(diǎn)風(fēng)阻都沒(méi)有。當(dāng)然像法拉利、蘭博基尼這樣的超跑，會(huì)死摳車身空氣動(dòng)力學(xué)，目的也是降低風(fēng)阻系數(shù)。

First of all, it must be clear that even if the car is more advanced, it is impossible to have no wind resistance when driving at high speed. Of course, super running like Ferrari and Lamborghini will focus on the aerodynamics of the body, and the purpose is to reduce the drag coefficient.

當(dāng)我們開(kāi)車在高速上面行駛的時(shí)候，如果四個(gè)車窗處于關(guān)閉狀態(tài)，車身將會(huì)形成一個(gè)相對(duì)完整的外形，風(fēng)阻系數(shù)是比較小的。假如打開(kāi)車窗，外形被破壞了，流經(jīng)車體表面的高速氣流會(huì)從車窗吹進(jìn)來(lái)，風(fēng)阻系數(shù)將會(huì)大大提高。由于發(fā)動(dòng)機(jī)需要更大的輸出功率對(duì)抗風(fēng)阻，所以油耗也會(huì)明顯提高。

When we drive at a high speed, if the four windows are closed, the body will form a relatively complete shape, and the wind resistance coefficient is relatively small. If you open the window, the shape will be damaged, and the high-speed air flow flowing through the surface of the car body will blow in from the window, and the wind resistance coefficient will be greatly improved. Since the engine needs more output power to resist wind resistance, the fuel consumption will also be significantly improved.

數(shù)據(jù)顯示，當(dāng)汽車開(kāi)到80~100km/h時(shí)，開(kāi)空調(diào)和開(kāi)窗戶增加的風(fēng)阻系數(shù)所消耗的汽油相差無(wú)幾；如果速度再快一些，比如120km/h的時(shí)候，開(kāi)窗戶確實(shí)比開(kāi)空調(diào)更費(fèi)油。

The data show that when the car is driven to 80 ~ 100km / h, the gasoline consumed by the increased drag coefficient of opening the air conditioner and opening the window is almost the same; If the speed is faster, for example, at 120km / h, opening the window really costs more fuel than opening the air conditioner.

高速正確的開(kāi)窗方法

High speed and correct window opening method

就像現(xiàn)在，天氣雖然暖和了，但也沒(méi)到開(kāi)空調(diào)的地步，高速行車的時(shí)候想透透氣怎么辦？建議可以打開(kāi)空調(diào)外循環(huán)。

Just like now, although the weather is warm, it is not enough to turn on the air conditioner. What should I do if I want to breathe when driving at high speed? It is recommended to turn on the external circulation of the air conditioner.

如果非要開(kāi)窗通風(fēng)的話，可以只開(kāi)前排一側(cè)的窗戶，這種情況下氣流在車內(nèi)會(huì)相對(duì)均衡。也可以開(kāi)兩扇窗戶，但還要注意不能是同側(cè)的，要對(duì)角線開(kāi)，這樣能獲得更好的空氣對(duì)流效果，是這種方法產(chǎn)生的風(fēng)噪比較低。

If you have to open windows for ventilation, you can only open the windows on the front side. In this case, the air flow will be relatively balanced in the car. Two windows can also be opened, but it should be noted that they should not be on the same side, but should be opened diagonally, so as to obtain better air convection effect. The key point is that the wind noise ratio produced by this method is low.

如今，很多人買車都會(huì)關(guān)注車型的綜合油耗，畢竟這油價(jià)眼看就要飛上天了。其實(shí)，影響汽車油耗的因素有很多，除了開(kāi)冷風(fēng)、高速開(kāi)窗戶，還跟日常的開(kāi)車習(xí)慣有很大的關(guān)系。

Nowadays, many people will focus on the comprehensive fuel consumption of models when buying cars. After all, the oil price is about to soar. In fact, there are many factors that affect car fuel consumption. In addition to opening cold air and opening windows at high speed, it is also closely related to daily driving habits.

有些人習(xí)慣性的把家用車當(dāng)賽車用，經(jīng)常是油門(mén)剎車天上一腳，地上一腳的踩，這種一走一停的激烈駕駛特別費(fèi)油，要不然那些油電混動(dòng)的車也不會(huì)在起步的時(shí)候采用電驅(qū)。

Some people habitually use household cars as racing cars. They often step on the accelerator and brake. This fierce driving of walking and stopping is particularly fuel consuming. Otherwise, those hybrid cars will not use electric drive when starting.