Hydrogen and Fuel Cells at NASA
Since its inception in 1958, NASA has been harnessing the unique properties of hydrogen to conduct missions. NASA's hydrogen and fuel cell technologies are used for many
purposes
. NASA has relied upon hydrogen gas as rocket fuel to deliver crew and cargo to space.
Why do space shuttles use hydrogen as fuel?
Liquid hydrogen fuel has many benefits, including its
low molecular weight and high energy output when burned together with liquid oxygen
. … Hydrogen also provides low-density liquid fuel for navigation thrusters in orbit. The main engine of the space shuttle used liquid hydrogen fuel.
Why are hydrogen fuel cells used in spacecraft?
Hydrogen-oxygen fuel cells are used in spacecraft. Their strengths include: they
are small for the amount of electricity they produce
.
the water they produce is useful as drinking water
.
Which fuel cell is suitable for spacecraft applications?
Alkaline fuel cells
have been the primary source of electrical power on human spaceflight systems for over four decades. However, alkaline fuel cells use a costly, aging technology.
What is the purpose of hydrogen fuel cells?
Hydrogen can be used in fuel cells
to generate power using a chemical reaction rather than
combustion, producing only water and heat as byproducts. It can be used in cars, in houses, for portable power, and in many more applications.
Is liquid hydrogen safe to drink?
Hydrogen water is generally recognized as safe (GRAS) by the
FDA, meaning that it's approved for human consumption and not known to cause harm. However, you should be aware that there's currently no industry-wide standard on the amount of hydrogen that can be added to water. As a result, concentrations can vary widely.
Is liquid hydrogen bad for the environment?
Emissions of hydrogen lead to increased burdens of methane and ozone and hence to an
increase in global warming
. Therefore, hydrogen can be considered as an indirect greenhouse gas with the potential to increase global warming.
What is the main disadvantage of hydrogen fuel cells as an alternative fuel?
Disadvantage:
Hydrogen Storage
and Transportation
Hydrogen can be stored as either gas in high-pressure tanks or as a liquid in cryogenic temperatures, but it must be in the gas form to be used for lift truck fuel cells. Both methods of hydrogen storage involve an inherent loss of energy.
Why does spacex not use hydrogen?
It's because liquid
Hydrogen needs extreme temperature control, leaks easily, is less dense
, thus requires a bigger fuel tank, expensive compared to Methane, not suitable for a reusable rocket and Mars mission, needs advanced metallurgy; hence, it increases rocket complexity and cost.
Can a car engine run on hydrogen?
Hydrogen has a wide flammability range in comparison with all other fuels. As a result,
hydrogen can be combusted in an internal combustion engine
over a wide range of fuel-air mix- tures.
Do fuel cells use liquid or gas hydrogen?
Hydrogen is a
clean fuel
that, when consumed in a fuel cell, produces only water. Hydrogen can be produced from a variety of domestic resources, such as natural gas, nuclear power, biomass, and renewable power like solar and wind.
Which fuel cell is the best?
Alkaline Fuel Cells
Operating at 60-70oC (140-158oF),
AFCs
are among the most efficient type of fuel cells, reaching up to 60% efficiency and up to 87% combined heat and power. Both the US and Russian/Soviet spaceships used alkaline fuel cells to produce electricity and drinking water for astronauts.
What are the 3 types of fuel?
There are three types of fossil fuels which can all be used for energy provision;
coal, oil and natural gas
.
What are the disadvantages of hydrogen fuel cells?
- Hydrogen Extraction. …
- Investment is Required. …
- Cost of Raw Materials. …
- Regulatory Issues. …
- Overall Cost. …
- Hydrogen Storage. …
- Infrastructure. …
- Highly Flammable.
Does Tesla use hydrogen fuel cells?
Battery electric vehicles, or BEVs, are the electric vehicles that most of us are familiar with today, like Teslas. …
Fuel-cell vehicles don't require charging at all
. The hydrogen tank is refilled at a hydrogen station in less than five minutes, just like your typical gas station today.
What are the disadvantages of fuel cells?
Disadvantages of using fuel cells in cars
These include:
hydrogen is in the gas state at room temperature and pressure
, so it is difficult to store in the car. fuel cells and electric motors are less durable than petrol engines and diesel engines, so they are not so long-lasting. fuel cells are very expensive.
