p********o
发帖数: 8012 | 1 俩个都是未来的方向，都会视乎技术的革新而长期增长。
目前来看，电动车，零排放，最省油钱，但是油钱普通人最多一年省1000，一辆新车的
价格却比普通的贵一倍，对老百姓吸引力不算太大。更现实的问题是充电时间至少半小时充满，一次充
电里程大约不到300迈和电池寿命及替换成本，没有完全技术革新将长期依赖补贴，像太阳能。其中tesla是个例
外，因为他属于苹果那样的高端车，价格和竞争对手差别不大，而且设计时尚先进，这
个应该有搞头。
天然气车，现实的选择，从小车到卡车都能改装，都能用，相当于换个引擎，因此与普
通车相比价格差距不大。以现在的天然气价格，相当于每加伦至少省1到2块，因此美国
高速大搞天然气站，就是为了更多的柴油车转成天然气车。
相关的股票tsla wprt都已经最近回调3成了，因为前一阵都疯了。也许再回来个10-20
趴是不错的捞底选择。 | O**l
发帖数: 12923 | 2
20
tesla的车每年维护费用貌似不少钱
cng 要实际一点
【在 p********o 的大作中提到】
: 俩个都是未来的方向，都会视乎技术的革新而长期增长。
: 目前来看，电动车，零排放，最省油钱，但是油钱普通人最多一年省1000，一辆新车的
: 价格却比普通的贵一倍，对老百姓吸引力不算太大。更现实的问题是充电时间至少半小时充满，一次充
: 电里程大约不到300迈和电池寿命及替换成本，没有完全技术革新将长期依赖补贴，像太阳能。其中tesla是个例
: 外，因为他属于苹果那样的高端车，价格和竞争对手差别不大，而且设计时尚先进，这
: 个应该有搞头。
: 天然气车，现实的选择，从小车到卡车都能改装，都能用，相当于换个引擎，因此与普
: 通车相比价格差距不大。以现在的天然气价格，相当于每加伦至少省1到2块，因此美国
: 高速大搞天然气站，就是为了更多的柴油车转成天然气车。
: 相关的股票tsla wprt都已经最近回调3成了，因为前一阵都疯了。也许再回来个10-20
| W********g
发帖数: 610 | 3 设计过压力容器不？知道压力容器多危险不？
Natural Gas Cars Pros my结论，电车是必然，天然气车多余
Pollution Control: This is one of the biggest issues gripping the world
today. The effects of air pollution are of great concern to modern
scientists. If the pollution is not controlled now, we may never be able to
revert the environmental damage we have caused. Natural gas cars are far
less polluting compared to gasoline cars.
Tax Incentives: Not just in America, governments all around the world have
declared tax incentives to consumers using natural gas cars. Even though
this is mainly to cap air pollution, the resulting low prices are a major
benefit.
Abundance of Natural Gas: Natural gas has not been used as extensively as
gasoline. Hence, there are vast amounts of natural gas deposits still
available. So, we can presume that we may not see complete depletion of
natural gas at least in our lifetime. As far as fuel is concerned, there is
relatively greater assurance of the availability.
Natural Gas Cars Conversion Kit: If you cannot afford to purchase a new
natural gas car, there is a conversion kit available, which will allow you
to hybridize your car. After installation of this kit, you will be able to
use a multi-fueled hybrid car, i.e. a gasoline and gas car.
Cost of Maintenance: When you buy a car or a truck you are obviously making
a long term investment. Cost of preventive maintenance of natural gas cars
and trucks is very low in a long term perspective.
High Compression Ratio: Natural gas engines have a high compression ratio.
High compression ratio means that the fuel is almost completely burnt,
leaving behind very few by-products, which is beneficial to the environment.
Natural Gas Cars Cons
Storage Tank : Any gas needs a container for storage or a storage tank. The
design implementation of a natural gas car does not allow engineers to have
a small storage tank, and a big storage tank is not very conducive. Car
safety is also a concern in gas storage.
Slow Performance: Natural gas cars are not famous for their high speeds. The
horse power of similarly calibrated engines for gasoline and natural gas
are not at all comparable. The low horse power basically results in the slow
performance of natural gas cars.
Less Performance: By performance, I mean the mileage of the car in relation
to the amount of gas used. One full tank of gasoline gives more output than
one full tank of natural gas.
CNG Station Availability: There are very few CNG stations available.
Therefore, your options become limited. If you run out of natural gas,
chances are that the nearest gas station will be at least ten miles away. In
this scenario, you can either carry a big tank in your car, or tow your car
to the CNG station.
Purchase Cost: Since natural gas cars are not as popular as gasoline cars,
manufactures are finding it difficult to drive down the cost. High purchase
cost is one thing that you have to deal with while purchasing natural gas
cars.
Low Volumetric Efficiency: This is the measure of the charge that is
delivered into the cylinders. Simply put, low volumetric efficiency
contributes to low efficiency in the performance of the car. | p********o
发帖数: 8012 | 4 不知道他们做个碰撞实验没有。通常情况下压力容器没有危险，但是万一车祸就不知道
了。如果能够抵挡车祸或者有安全发之类的，应该也可行
to
【在 W********g 的大作中提到】
: 设计过压力容器不？知道压力容器多危险不？
: Natural Gas Cars Pros my结论，电车是必然，天然气车多余
: Pollution Control: This is one of the biggest issues gripping the world
: today. The effects of air pollution are of great concern to modern
: scientists. If the pollution is not controlled now, we may never be able to
: revert the environmental damage we have caused. Natural gas cars are far
: less polluting compared to gasoline cars.
: Tax Incentives: Not just in America, governments all around the world have
: declared tax incentives to consumers using natural gas cars. Even though
: this is mainly to cap air pollution, the resulting low prices are a major
| p********o
发帖数: 8012 | 5 还有个两者共同的问题，油价要是不高那么大家都无所谓了，尤其是电动车，除非价格
大降。 | a****g
发帖数: 8131 | 6 大型车ng倒是可以，可以多做点防护
小车就那么大，估计没人愿意车里有个不定时炸弹
to
【在 W********g 的大作中提到】
: 设计过压力容器不？知道压力容器多危险不？
: Natural Gas Cars Pros my结论，电车是必然，天然气车多余
: Pollution Control: This is one of the biggest issues gripping the world
: today. The effects of air pollution are of great concern to modern
: scientists. If the pollution is not controlled now, we may never be able to
: revert the environmental damage we have caused. Natural gas cars are far
: less polluting compared to gasoline cars.
: Tax Incentives: Not just in America, governments all around the world have
: declared tax incentives to consumers using natural gas cars. Even though
: this is mainly to cap air pollution, the resulting low prices are a major
| r*****e
发帖数: 4611 | 7 电动车挺好的。以色列就在用。加油站换电池，很快。
唯一的问题是开不远。 | s*****8
发帖数: 1891 | | u********e
发帖数: 4950 | 9 GOOD analysis, ding
to
【在 W********g 的大作中提到】
: 设计过压力容器不？知道压力容器多危险不？
: Natural Gas Cars Pros my结论，电车是必然，天然气车多余
: Pollution Control: This is one of the biggest issues gripping the world
: today. The effects of air pollution are of great concern to modern
: scientists. If the pollution is not controlled now, we may never be able to
: revert the environmental damage we have caused. Natural gas cars are far
: less polluting compared to gasoline cars.
: Tax Incentives: Not just in America, governments all around the world have
: declared tax incentives to consumers using natural gas cars. Even though
: this is mainly to cap air pollution, the resulting low prices are a major
| t********t
发帖数: 5415 | 10 今天cnbc还提到这个...cng还是大车用得多（WM那些垃圾车，18轮什么的），一个确实
是容量与安全性，另一个是现在的油站都没有cng，改造油站这事既得利益者不一定愿
意...但是18轮什么的都在自己的集中处加油，改起来阻力小很多。WM好像到明年会有
40%的垃圾车用cng。所以短途/平常用电车可以，天然气车对于consumer来说不行，但
是对于industry use还是可以的 |
|
