Sentences with phrase «leakage rates»

Our national construction code does not require a minimum air leakage rate.

Even at a 1.2 percent leakage rate, natural gas companies would emit the same annual amount of greenhouse gases as 32 million cars or 40 coal - fired power plants.

Though the exact leakage rate is uncertain, the negative impacts of methane leakage are clear.

This is just the latest peer - reviewed study finding methane leakage rates well below the threshold for natural gas to maintain its climate benefits over other traditional fuel alternatives.

Recent science indicates that with leakage rates as little as 3 per cent, emissions from gas are no better than coal fired power stations.

The homes in the study under discussion had air leakage rates that covered a wide range, as is typical for a group of new homes.

This figure is only from reducing leakage rates of HFC refrigeration systems, so if Walmart commits to taking action on HFC - free refrigeration, it would greatly reduce its greenhouse gas emissions.

Each of these EDF studies found leakage rates in the range of 1.2 and 1.6 percent, which is notable considering they were generally regarded to be the most comprehensive studies of their kind at the time they were released.

Although the study's estimated leakage rate for production operations was in line with EPA's estimate, several processes leaked more than previously thought, while another (well completions) emitted much less due to the effectiveness of recent EPA rules.

It takes a far, far higher leakage rate to completely negate the benefits of switching, and even then you'd wind up coming out ahead from the switch a few decades after you stop using fossil fuels.

Stefan Schwietzke, a research associate at the National Oceanic and Atmospheric Administration's Earth System Research Laboratory in Boulder, Colo., said Howarth may be overestimating methane emissions from shale gas because his 12 percent leakage rate estimate is based mostly on a single satellite study.

Using more reasonable leakage rates and bases of comparison, shale gas has a [greenhouse gas] footprint that is half and perhaps a third that of coal.

The paper finds that just 1.2 percent overall methane emissions are attributable to the U.S. natural gas industry, based on the most recent EPA methane emission estimate of 1.2 percent of production, which is in line with a number of studies that find low U.S. leakage rates between 1 and 1.8 percent.

Five of those studies are featured in the following EID graphic illustrating the most prominent research showing low leakage rates from U.S. natural gas systems.

While leakage rates of «fugitive methane» are currently around 4 percent according to EPA, they need to be at less than 1 percent of total production.

«A relatively small leakage rate can have significant impacts,» notes energy resource specialist Adam Brandt of Stanford University, who lead the team that reported its finding on February 14 in Science.

«Our agricultural practices have always impacted water quality, but over the past century the mechanization of agriculture and the use of more potent fertilizers has caused a greater effect: the nitrogen leakage rate is higher....

A company that has such high revenue and a low number of stores should be a leader in transitioning to HFC - free refrigeration, but instead Costco has not even come out with a statement on plans to phase out HFC refrigerants or even control leakage rates.

UT's sampling of well sites estimates the national leakage rate associated with the production phase of natural gas extraction to be equivalent to less than half of one percent of total natural gas produced.

Q = volumetric leakage rate through leakage pathway C = leakage coefficient ΔP = pressure difference across leakage pathway n = leakage exponent = 0.65 (ASHRAE 2005, page 27.12)

Careful attention is paid to the vapour barrier to ensure that the air leakage rate remains below.6 air changes per hour (ACH), the maximum allowed with the PassivHouse framework.

1 ton = ~ 7.3 barrels oil estimated Gulf oil leakage rate ~ 21600 barrels / day (5 - 40,000 depending on who's estimating) or 3000 tons / day methane emission = 1.5 e3 ton / day = 1.5 e9 g / day at 50 % methane by weight in the leak (probably a high estimate) Gulf area = 1.5 e6 km ^ 2 = 1.5 e12 m ^ 2 Gulf average depth = 1.62 e3 m Gulf volume = ~ 2.4 e15 m ^ 3

The correct leakage rate was 300 µSv (microSieverts).

Nevertheless, write the authors, leakage rates in the production phase vary greatly from study to study, with one Cornell University Study placing the figure at 9 percent.

The results of the combined sampling showed an optimal mean leakage rate of 0.4 percent of production, which the researchers noted is «significantly lower than rates found using top - down methodology at any other basin.»

Experts want more research, more demonstrations Because CCS has never been tried at a commercial scale, it is impossible to pinpoint the exact leakage rate that would occur with 3,000 gigatons of gas, analysts say.

CREDIT: Shutterstock Satellite observations of huge oil and gas basins in East Texas and North Dakota confirm staggering 9 and 10 percent leakage rates of heat - trapping methane.

However, because of the high global warming potential of methane (CH4, the major component of NG), climate benefits from NG use depend on system leakage rates.

High leakage rates, a short methane GWP, and comparison in terms of heat content are the inappropriate bases upon which Howarth et al. ground their claim that gas could be twice as bad as coal in its greenhouse impact.

All new homes built in the state had to show through performance testing that they had an air leakage rate of less than 7 air changes per hour at 50 Pascals of...

Cutting methane leakage rates from natural gas systems to less than 1 percent of total production would ensure that the climate impacts of natural gas are lower than coal or diesel fuel over any time horizon.

If current estimates are correct that the leakage rate is around 3 percent, then we calculated that switching all coal plants to average - efficiency natural gas plants would have little effect on the power sector's contribution to climate change.

A leakage rate of 1 percent every decade could be «very serious,» he said, and would eventually lead to temperature spikes of about 3 degrees Celsius in the next century and a rise close to 4 degrees Celsius over the following 2,000 years.

Replacing old coal - fired power plants with new natural gas plants could cause climate damage to increase over the next decades, unless their methane leakage rates are very low and the new power plants are very efficient.

Methane lawsuit threat hangs over EPA's head Research by the Environmental Defense Fund has found that leakage rates must remain below 3.2 percent for natural gas power plants to carry a climate advantage over coal plants.

«We believe leakage rates are higher than official estimates,» Brandt concludes, but that leakage rate, even if the worst is assumed, is «unlikely to be high enough to disadvantage the switch from coal to natural gas.»

Otherwise, leakage rates from natural gas alone may be overestimated, he said.