Multiplied by 2.5? Whaaaat? Where'd you get that number from? I know incandescents produce heat...but *that much* heat?
For that number to be correct the amount of heat an incandescent produces is irrelevant. Each watt of heat the bulb produces must be removed by the AC. Typically an AC needs 1.5 times the energy it removes to remove that energy. To get the complete losses we need to add the direct losses of the bulb (a factor 1) to the indirect losses of the additional AC work (a factor 1.5). 1+1.5=2.5. A calculation example: An 100 W incandescent bulb with 10% efficiency (this is a good bulb) produces 90W heat. To remove that 90W the AC must spend 90*1.5=135W Total loss = the energy the bulb dumps + the energy the AC needs to remove that energy = 90+135=225 W. If we replace that with a 20W powersaving bulb with 20% efficiency then that bulb produces 16W of heat for the same light. This 16W must also be removed by the AC, which spends 24W doing that. Total energy cost for the waste heat: 40W Total saved energy: 225-40=185W. The directly saved energy is only 100-20=80W That's a factor 2.3 over the direct energy savings alone. Ok, my factor 2.5 was too simple. It does allow for quick calculations.
Does everyone have the top-of-the-line A+++ refrigerator? I can't afford one like that. I don't think that's a good basis for comparison.
I didn't mean that. I was trying to show that his light could very well be the biggest energy user in his house. Not that it is so in every house. However, a class A refrigerator with approximately the same volume uses 318 kWh a year. My comparison site doesn't have worse than class A refrigerators at that size. With Kieskeurig (warning, Dutch) that means they are hard to get here in the Netherlands. The class A is only EUR 488 delivered, while the A+++ is EUR 599 delivered. Not outrageously more expensive. Top of the line, yes, but mainly due to it's size. Not it's energy efficiency.
Up to a few years ago paying far more tax than required was done often here in the Netherlands. Not out of niceness, but because it was a good way to make more of it.
You see, when you had to pay, say E1000, and "accidentally" paid E10,000 the remaining 9000 would be paid back approximately a year later. For a time the interest the tax collecting agency had to pay over that was fixed at 7% (Don't pin me on the number. It was far higher than on savings accounts). They fixed that to a flexible market conform interest a few years back because too many people were abusing it. It was really cutting into national tax income.
Hardly. If a company, based in Russia, gets a subpoena for their US department they can do what they want to prevent access. Stuff like revoking access for all US based employees is not illegal for them. The US government may not like it, but that matters not to the Russian company. The US based employee has to take positive action to comply. Since (s)he can't do anything that is quite limited. Requesting restored access about it. I would not like to be the US based employee in that case. The best that happens is that you get fired. The worst is fired, from a cannon, into the sun.
Now when the company in question is British (for example) stuff changes. In that case the US will send a request for the equivalent of a subpoena to GB and they will comply (since they are the US's lapdogs). Then the British company will have a demand they are legally obliged to fulfill.
Nuclear and solar are useful. However, you can't control them with the speed required to keep the net stable. Natural gas ramps up in minutes. Solar is unpredictable. You can't ramp it up. Nuclear is slow. A controlled shutdown takes days. If we want to fully switch to those resources we need large scale electricity storage. For example 20% of daily use in storage. The US used 4,095 x 10e9 kWh in 2012 according to wikipedia. That's on average 11.2 x 10e9 kwh a day. Assuming that my 20% figure is sufficient, that would mean that 2.24 x 10e9 kwh of storage is required. If we use Li-Po batteries with 265 Wh/kg that is approximately 8.5 million tons of Li-Po batteries. Ergo, currently such energy storage is unfeasible.
I agree with you on the coal. I don't know any reason why we should continue using that, apart from price. It is not as slow as nuclear but not fast enough to fix fluctuations in electricity usage. Not by a long shot.
Do light bulbs use up *that much* of your electric bill? Huh. I thought that A/C or heating, plus refrigerator and other appliances took up 90% of your utility bill.
A/C: Incandescents produce heat, the AC has to work harder to remove that heat. Thus the energy savings should be multiplied by approximately 2,5 if the AC is running.
Heating: Heating electricity use can be lowered by using insulation and even moved from the electricity bill to the natual gas bill by using a gas heater. Not all places where people live need heating.
Refrigerator: Modern efficient refrigerators use far less power than lightbulbs use. Let's take a huge 215+89l refrigerator/freezer combo, class A+++: the Bosch KGE36MW40. It uses approximately 149 kWh a year. If you have 10 bulbs of 50 watts running 3 hours a day that uses (10*50*3*365)/1000=547,5 kWh.
The old adage, being so tragically expressed here in real world terms, that the only "secure" computer is locked in a vault at the bottom of an ocean belies the very nature of security.
I always thought that was the response to someone requesting a completely secure computer. To explain why the requester really doesn't want what they are asking for.
Modern dishwashers can be slightly more efficient than manual washing. But those A++ dishwashers are expensive. Gas hot water over electric is not always an energy and cost saver. Usually the hot water is piped from the heater to the tap over a longer distance with gas heaters. The heat in the water in that piece of pipe is lost. 'round here the electric heaters are usually directly under the tap. 1 m of Ã10 mm (id) isn't much water. The gas heaters are often 10m away. With the same inside diameter that means there is 10 times as much lost heat.
If that is true, which is highly doubtfull, that 3g modem is only active when powered down. Powered down means there is no power to the memory banks. No power to the memory banks means the data in it will be destroyed in a couple of microseconds (bar cryogenic cooling). Ergo your encryption keys (which are in your memory banks) are destroyed.
And that is all dependent on that mysterious, magical "phantom power" actually working for a useful amount of time. On die capacitors are hellish expensive.
Have you ever heard a typewriter? These things are LOUD. By the way, any word on what they are going to do with the waste dot-matrix tape with a perfect image of what was printed? Throw it in a dumpster? Hand it to enemy spies?
Disclaimer: I am not an IT professional. Why not automate the deployment and go in via VPN afterwards to check if all is well? Of course this should be done within driving range so that you can get there a couple of hours before business hours to fix the horrible, horrible mistakes that will be made from time to time. Or when the VPN doesn't respond.
If I were a manager at Tesla I'd want to know how the car got stolen. Is the range on the keys too big? Does the car stop if it drives out of that range (which would mean the current driver has no access to the keys)? Were the electronics damaged before the crash? Was there a remote hack?
The crash, well, that is not as interesting. Most 100 mph crashes result in a mess. Not much you can do about that (unless you count limiting the max speed or adding so much support and crumple zones that it can't go 100 mph anyway)
In some countries running water in a stream is clean enough to drink. For example: Sweden, Norway and Austria (if you drink up stream. The small mountain streams are clean). It all depends on whether the natives care about the environment. In these countries rules and regulations prevent a lot of problems.
The one bottled water that I checked because it tasted like bleach (Bar Le Duc) turned out to have about 1000 times as much chlorine in it as reported in our local tap water. Added on purpose to increase shelf life. Bottled water always tastes chemical to me, but that stuff is probably usable as a light bleach. I can't imagine why any Dutch would drink bottled water, as our water supply is far cleaner than the bottled stuff. I only buy Spa because their bottles are so damn convenient. And I get some free water with that bottle!
Most titanium pans are really really thin. That hampers heat distribution and increases burning of food.
My best frying pan is a sandwich of aluminum with stainless steel layers on the outside. The aluminum distributes the heat, the stainless steel protects the aluminum (as aluminum is prone to fast wear and I'm not certain it is not unhealthy). The pan was expensive, but since I use it about twice a week it is worth it.
Slashdot Mirror
It was a joke that got out of hand.
Multiplied by 2.5? Whaaaat? Where'd you get that number from? I know incandescents produce heat...but *that much* heat?
For that number to be correct the amount of heat an incandescent produces is irrelevant.
Each watt of heat the bulb produces must be removed by the AC. Typically an AC needs 1.5 times the energy it removes to remove that energy.
To get the complete losses we need to add the direct losses of the bulb (a factor 1) to the indirect losses of the additional AC work (a factor 1.5). 1+1.5=2.5.
A calculation example:
An 100 W incandescent bulb with 10% efficiency (this is a good bulb) produces 90W heat. To remove that 90W the AC must spend 90*1.5=135W
Total loss = the energy the bulb dumps + the energy the AC needs to remove that energy = 90+135=225 W.
If we replace that with a 20W powersaving bulb with 20% efficiency then that bulb produces 16W of heat for the same light.
This 16W must also be removed by the AC, which spends 24W doing that. Total energy cost for the waste heat: 40W
Total saved energy: 225-40=185W.
The directly saved energy is only 100-20=80W
That's a factor 2.3 over the direct energy savings alone.
Ok, my factor 2.5 was too simple. It does allow for quick calculations.
Does everyone have the top-of-the-line A+++ refrigerator? I can't afford one like that. I don't think that's a good basis for comparison.
I didn't mean that. I was trying to show that his light could very well be the biggest energy user in his house. Not that it is so in every house.
However, a class A refrigerator with approximately the same volume uses 318 kWh a year. My comparison site doesn't have worse than class A refrigerators at that size. With Kieskeurig (warning, Dutch) that means they are hard to get here in the Netherlands. The class A is only EUR 488 delivered, while the A+++ is EUR 599 delivered. Not outrageously more expensive.
Top of the line, yes, but mainly due to it's size. Not it's energy efficiency.
Up to a few years ago paying far more tax than required was done often here in the Netherlands. Not out of niceness, but because it was a good way to make more of it.
You see, when you had to pay, say E1000, and "accidentally" paid E10,000 the remaining 9000 would be paid back approximately a year later. For a time the interest the tax collecting agency had to pay over that was fixed at 7% (Don't pin me on the number. It was far higher than on savings accounts).
They fixed that to a flexible market conform interest a few years back because too many people were abusing it. It was really cutting into national tax income.
Hardly. If a company, based in Russia, gets a subpoena for their US department they can do what they want to prevent access. Stuff like revoking access for all US based employees is not illegal for them. The US government may not like it, but that matters not to the Russian company.
The US based employee has to take positive action to comply. Since (s)he can't do anything that is quite limited. Requesting restored access about it.
I would not like to be the US based employee in that case. The best that happens is that you get fired. The worst is fired, from a cannon, into the sun.
Now when the company in question is British (for example) stuff changes. In that case the US will send a request for the equivalent of a subpoena to GB and they will comply (since they are the US's lapdogs). Then the British company will have a demand they are legally obliged to fulfill.
Imagine the power usage for that cluster!
There is lies, damned lies, statistics and marketing.
Nuclear and solar are useful. However, you can't control them with the speed required to keep the net stable.
Natural gas ramps up in minutes.
Solar is unpredictable. You can't ramp it up.
Nuclear is slow. A controlled shutdown takes days.
If we want to fully switch to those resources we need large scale electricity storage. For example 20% of daily use in storage. The US used 4,095 x 10e9 kWh in 2012 according to wikipedia. That's on average 11.2 x 10e9 kwh a day. Assuming that my 20% figure is sufficient, that would mean that 2.24 x 10e9 kwh of storage is required.
If we use Li-Po batteries with 265 Wh/kg that is approximately 8.5 million tons of Li-Po batteries.
Ergo, currently such energy storage is unfeasible.
I agree with you on the coal. I don't know any reason why we should continue using that, apart from price. It is not as slow as nuclear but not fast enough to fix fluctuations in electricity usage. Not by a long shot.
Do light bulbs use up *that much* of your electric bill? Huh. I thought that A/C or heating, plus refrigerator and other appliances took up 90% of your utility bill.
A/C: Incandescents produce heat, the AC has to work harder to remove that heat. Thus the energy savings should be multiplied by approximately 2,5 if the AC is running.
Heating: Heating electricity use can be lowered by using insulation and even moved from the electricity bill to the natual gas bill by using a gas heater. Not all places where people live need heating.
Refrigerator: Modern efficient refrigerators use far less power than lightbulbs use. Let's take a huge 215+89l refrigerator/freezer combo, class A+++: the Bosch KGE36MW40.
It uses approximately 149 kWh a year. If you have 10 bulbs of 50 watts running 3 hours a day that uses (10*50*3*365)/1000=547,5 kWh.
The old adage, being so tragically expressed here in real world terms, that the only "secure" computer is locked in a vault at the bottom of an ocean belies the very nature of security.
I always thought that was the response to someone requesting a completely secure computer. To explain why the requester really doesn't want what they are asking for.
Modern dishwashers can be slightly more efficient than manual washing. But those A++ dishwashers are expensive.
Gas hot water over electric is not always an energy and cost saver. Usually the hot water is piped from the heater to the tap over a longer distance with gas heaters. The heat in the water in that piece of pipe is lost.
'round here the electric heaters are usually directly under the tap. 1 m of Ã10 mm (id) isn't much water. The gas heaters are often 10m away. With the same inside diameter that means there is 10 times as much lost heat.
Nah, they should post a security guard in full plate mail with a sword and everything.
No, over there.
They burn quite easily in a cloud of F2O2.
Disclaimer: there may be some trouble in containing the cloud of F2O2. And you really really want to contain it.
If that is true, which is highly doubtfull, that 3g modem is only active when powered down. Powered down means there is no power to the memory banks. No power to the memory banks means the data in it will be destroyed in a couple of microseconds (bar cryogenic cooling). Ergo your encryption keys (which are in your memory banks) are destroyed.
And that is all dependent on that mysterious, magical "phantom power" actually working for a useful amount of time. On die capacitors are hellish expensive.
Have you ever heard a typewriter? These things are LOUD.
By the way, any word on what they are going to do with the waste dot-matrix tape with a perfect image of what was printed? Throw it in a dumpster? Hand it to enemy spies?
Is it really a CME when earth is orbiting inside the sun?
Disclaimer: I am not an IT professional.
Why not automate the deployment and go in via VPN afterwards to check if all is well?
Of course this should be done within driving range so that you can get there a couple of hours before business hours to fix the horrible, horrible mistakes that will be made from time to time. Or when the VPN doesn't respond.
That depends, do they offer Belgian beers chilled to the right temperature?
access to the system through VPN
Unless the error brings down your VPN server.
If I were a manager at Tesla I'd want to know how the car got stolen. Is the range on the keys too big? Does the car stop if it drives out of that range (which would mean the current driver has no access to the keys)? Were the electronics damaged before the crash? Was there a remote hack?
The crash, well, that is not as interesting. Most 100 mph crashes result in a mess. Not much you can do about that (unless you count limiting the max speed or adding so much support and crumple zones that it can't go 100 mph anyway)
Nope. Vantablack.
who drinks straight from a lake or river?
In some countries running water in a stream is clean enough to drink. For example: Sweden, Norway and Austria (if you drink up stream. The small mountain streams are clean).
It all depends on whether the natives care about the environment. In these countries rules and regulations prevent a lot of problems.
The one bottled water that I checked because it tasted like bleach (Bar Le Duc) turned out to have about 1000 times as much chlorine in it as reported in our local tap water. Added on purpose to increase shelf life.
Bottled water always tastes chemical to me, but that stuff is probably usable as a light bleach.
I can't imagine why any Dutch would drink bottled water, as our water supply is far cleaner than the bottled stuff. I only buy Spa because their bottles are so damn convenient. And I get some free water with that bottle!
How do you get that foul chloride dioxide back out of your water?
Most titanium pans are really really thin. That hampers heat distribution and increases burning of food.
My best frying pan is a sandwich of aluminum with stainless steel layers on the outside. The aluminum distributes the heat, the stainless steel protects the aluminum (as aluminum is prone to fast wear and I'm not certain it is not unhealthy).
The pan was expensive, but since I use it about twice a week it is worth it.