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How hot can a hydrogen combustion engine can get without coolant? 


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A hydrogen combustion engine can reach temperatures up to 1713°C at the exit of the first section and up to 1386°C at the exit of the second section, depending on the pressure in the combustion chamber . The cooling loss in hydrogen combustion is higher compared to methane combustion due to a thinner quenching distance and faster burning velocity, resulting in a higher cooling loss and lower thermal efficiency for hydrogen combustion . However, the specific temperature at which a hydrogen combustion engine can operate without coolant is not explicitly mentioned in the provided abstracts. Further research or specific data is needed to determine the maximum temperature a hydrogen combustion engine can reach without coolant.

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The provided paper does not mention the maximum temperature that a hydrogen combustion engine can reach without coolant.
The provided paper does not mention the maximum temperature that a hydrogen combustion engine can reach without coolant.
The provided paper does not mention the maximum temperature that a hydrogen combustion engine can reach without coolant.
The provided paper does not mention the maximum temperature that a hydrogen combustion engine can reach without coolant.
The provided paper does not mention the specific temperature at which a hydrogen combustion engine can get without coolant.

Related Questions

What is the temperature of the exhaust of the hydrogen combustion engine.?5 answersThe temperature of the exhaust of a hydrogen combustion engine can vary depending on various factors such as engine load and speed. However, in one study, it was found that the exhaust temperature of a diesel engine, which can be used as a hydrogen combustion engine, ranges from 250°C to 450°C depending on the engine load. Another study proposed an apparatus for estimating the temperature of the exhaust gas in the exhaust manifold of an internal combustion engine. This estimation is based on the temperature increment caused by adiabatic compression and the amount of heat lost in the exhaust gas. Therefore, the exact temperature of the exhaust of a hydrogen combustion engine would depend on the specific engine and its operating conditions.
What are the main challenges in the development of hydrogen combustion engines?5 answersThe main challenges in the development of hydrogen combustion engines include addressing abnormal combustion phenomena such as knock, pre-ignition, and backfire. These abnormal combustions are more prevalent in hydrogen-fueled engines and require special attention. Modeling the injection process and accurately predicting the laminar flame velocity and autoignition time of hydrogen-air mixtures are also challenging. Experimental data on air-hydrogen mixtures under engine-type conditions are limited, making it difficult to develop robust and predictive computational fluid dynamics (CFD) models. Combustion instabilities are another challenge, as the dynamic behavior of hydrogen-fueled flames differs from hydrocarbon-fueled flames. Understanding the impact of hydrogen fuel and other parameters on combustion systems is crucial. Additionally, low volumetric efficiencies and pre-ignition problems need to be addressed in hydrogen engines.
What is the specific heat capacity of hydrogen from 0k to 400K?5 answersThe specific heat capacity of hydrogen from 0K to 400K has been measured using differential scanning calorimetry. The heat capacities of hydrogenated and deuterated ZrNi transition metal hydrides and deuterides were found to be increased relative to the as-prepared alloys, possibly due to the contribution from optical phonon modes of interstitial H or D atoms. The measurement of specific heat capacity can also be done using a calorimeter with a reactor, stirrer, and thermostats, where a modulated energy profile is applied to the medium under near isothermal conditions, and the resulting energy changes are monitored to determine the specific heat capacity. Another method involves calculating the thermal capacity of a sample by using temperature differences between a circumferential object and heat sensitive plates, and then calculating the specific heat capacity from the thermal capacity. However, the specific heat capacity of hydrogen in the temperature range of 0K to 400K was not explicitly mentioned in the provided abstracts.
Whats the output temperature of hydrogen boilers4 answersThe output temperature of hydrogen boilers is not explicitly mentioned in the abstracts provided. However, one paper discusses the injection of hydrogen into a combustion chamber, resulting in the generation of high temperature steam. Another paper mentions the use of hydrogen mixed with natural gas in gas boilers, which increases the combustion temperature. These findings suggest that the output temperature of hydrogen boilers can be higher than conventional boilers due to the combustion characteristics of hydrogen. However, without further information or specific data from the abstracts, it is not possible to provide an exact numerical value for the output temperature of hydrogen boilers.
What are the flammanility limits of hydrogen?5 answersThe flammability limits of hydrogen were found to be influenced by various factors such as initial temperature, ignition energy, and pressure. The addition of hydrogen to isooctane–air mixtures increased the lean flammability limits. In the case of hydrogen-enriched natural gas, the flammability limits were found to be similar to those of methane–hydrogen mixtures with the same hydrogen fraction. The lower flammability limit (LFL) of hydrogen initially decreased with pressure from 1.0 to 0.3 atm and then increased with further decrease of pressure, while the upper flammability limit (UFL) was observed to be inversely proportional to the initial pressure in the range from 1.0 to 0.3 atm and proportional to the initial pressure from 0.3 to 0.05 atm. The flame propagation velocity of hydrogen was larger than that of lower alkanes and ethylene, and it increased when the initial pressure decreased from 1.0 to 0.3 atm.
How hydrogen burn in an internal combustion engine?4 answersHydrogen burns in an internal combustion engine by being mixed with a hydrocarbon fuel or organic hydride-containing fuel. In the first case, hydrogen gas is contained in the form of minute bubbles in a liquid hydrocarbon fuel, which is then injected into the engine. In the second case, the organic hydride-containing fuel is separated into hydrogen and dehydrogenated fuel through a dehydrogenation reaction. Both hydrogen and dehydrogenated fuel can be supplied to the engine, or only hydrogen can be supplied depending on the mode of operation. Additionally, in a hydrogen using internal combustion engine, the dehydrogenation reactor is warmed up by burning the hydrogen stored in a hydrogen buffer tank, allowing the reactor to reach the active temperature quickly. These methods of hydrogen combustion in internal combustion engines aim to reduce pollution and utilize hydrogen as a cleaner fuel source.

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