Search results for: “global temperature climate science”
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Adiabatic flame temperature: hydrogen, methane and oil products?
At an idealized, 100% stoichiometric ratio, the adiabatic flame temperature for natural gas is 1,960ºC, hydrogen burns 300ºC hotter at 2,250ºC and oil products burn somewhere in between, at around 2,150ºC. The calculations show why hydrogen cannot always be dropped into an existing turbine or heat engine.
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Energy needed to produce steam: enthalpy and entropy data?
This data-file quantifies the energy needed to produce steam, for industrial heat, chemicals, CCS plants and hydrogen reforming? As rules of thumb, low pressure saturated steam at 100◦C requires 2.6 GJ/ton (720kWh/ton), medium pressure dry steam at 6-bar and 300◦C requires 3 GJ/ton (830kWh/ton) and super-critical steam at 250-bar and 600◦C requires 4 GJ/ton (1,150kWh/ton).
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Density of gases: by pressure and temperature?
The density of gases matters in turbines, compressors, for energy transport and energy storage. Hence this data-file models the density of gases from first principles, using the Ideal Gas Equations and the Clausius-Clapeyron Equation. High energy density is shown for methane, less so for hydrogen and ammonia. CO2, nitrogen, argon and water are also captured.
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Boltzmann energy overview?
The Boltzmann constant, denoted as kB, or 1.381 x 10^-23 J/K, is the most important number in thermodynamics. It denotes the rate at which a single particle will gain thermal energy (in Joules) as its absolute temperature rises (in Kelvin). It underpins the Boltzmann distribution and the Maxwell-Boltzmann distributions, which matter in modelling gases, energy…
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Albedo of different landscapes: a challenge for reforestation?
Forests are darker than their surroundings? So does their low albedo curb our enthusiasm for nature-based solutions? This data-file aggregates the average albedo of different landscapes. The albedo impact of reforestation seems numerically very small. There is even an intriguing link where forests can increase the formation of clouds, which have the highest average albedo…
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Hydrogen: what GWP and climate impacts?
Hydrogen is an indirect GWP, as it breaks down in the atmosphere over 1-2 years, increasing the lifespan of other GHGs, such as methane. So what is hydrogen GWP versus methane? 1 ton of atmospheric H2 most likely causes 11x more warming than 1 ton of CO2 (the number for methane is 34x). Eight conclusions…
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The route to net zero: an energy-climate model for 2-degrees
We have modeled the global climate system from 1750-2065, to simplify the science of energy transition. ‘Net zero’ is achievable by 2050. Atmospheric CO2 remains below 450ppm, consistent with 2-degrees warming. Fossil fuel usage is 10% higher than today, but the fossil fuel industry is transformed.
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Nature based solutions to climate change?
Nature based solutions are likely to deliver c20-25% of the decarbonization in a realistic roadmap to net zero. Reforestation is low-cost (c$50/ton), technically ready, convenient and helps nature. Key challenges are improving the quality of nature-based CO2 removals and accelerating momentum. We see upside for companies that can clear these hurdles. Our top ten conclusions…
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Wildfire suppression companies?
1-2bn acres of land burns globally each year, which could increase by over 35% due to climate change. Hence this data-file screens emerging companies in wildfire suppression, which are focused on preventing, detecting and containing wildfires. The most commonly used methods are drones and AI. Thus adapting to climate change requires more energy not less?
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LNG liquefaction technologies: an overview?
This data-file is an overview of different LNG liquefaction technologies: APCI, APX, Optimised Cascade, Fluid Cascade, DMR, SMR, PRICO and MMLS. A typical LNG liquefaction plant has energy intensity of 280kWh/ton, consuming 5% of the input gas entering the plant, with 20kg/boe of Scope 1&2 CO2 intensity. But efficient and electric-drive compression can lower these…
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