I've heard the criticism of laser or other beam weaponry being that they create a lot of waste heat - more so than railguns or other mass drive type weapons - to the point of being almost as dangerous for the user as it is for the target. I'm not exactly a huge expert on lasers but I am a believer in them being under-rated. What's the truth of this? Should they be relegated to smaller PDC-style defense on ships? Are they better suited for stations/moons which can have bigger dedicated cooling systems?
Having just read the FAQ on the Hive community, it seems to me that the Hive Smart TRV just wastes a fortune.
If the Smart TRV calls for heat, but the Hive Thermostat is NOT calling for heat, then the TRV sets the thermostat to a half hour boost (at 22Λ ). Suppose the room with the Smart TRV heats up in 15 minutes. Then the boiler will carry on running for the full 30 minutes, wasting 15 minutes of useless heat (because the room with the smart TRV that was calling for heat has already got up to temperature.
Can anyone reassure me that this Hive TRV is not just a gigantic waste of money?
Location: Somewhere in northern Germany
I have built a "heater" which digs Bitcoins for me and warms my living room at the same time. Since I spent quite a bit of time on this project and it wasn't clear in the beginning if what I came up with will work, I would like to present the project so you can benefit from my experience.
I run 2 hashboards. These have a hashrate of 9.4 TH/s and would generate 0.00000220 BTC / hour according to a mining calculator. With an electrical power of 0.78kW.
Let's say we produce 1000kWh of heat with the hashboards. Then we have to run the hashboards 1000kWh / 0,78kW = 1282 hours.
This costs us 0.27β¬/kWh * 1282 h = 346β¬.
We get 1000kWh in heat and 0.00000220 BTC/h * 1282 h = 0.0028204 BTC
So at a rate of 50000β¬/BTC we get 141β¬ in the form of bitcoin.
Compare this with gas heating:
1000kWh gas heat costs 90β¬
1000kWh Electric heat costs 346β¬ and we get 141β¬ in Bitcoin so 346β¬-141β¬ = 200β¬.
The rate of Bitcoin would have to be around 90000β¬/BTC for it to cost the same as gas heating.
Gas price about 0.09β¬ / kWh
Electricity price about 0.27β¬ / kWh
Bitcoin price about 43700β¬/BTC
Green electricity share in the power grid about 45%.
Hardware:
Antminer S9j (3 hashboards) with power supply.
30 liters tin bucket
20 liters Addinol white oil WX15
Radiator height: 60cm width: 80cm depth: 12cm
Fabric hose, pipe fitting etc.
Hot water pump
Small PC fan
Fan Simulator
At first I wanted to operate the power supply in the oil (see the picture of the aluminum frame).
But since I did not know how the thing runs, I have the power supply first left out.
Conclusion:
The system has been stable for a few days now. I usually use it in the morning and a couple of hours in the evening, when I am at home.
The fan of the power supply I have also throttled a little (5 diodes soldered into the line of the fan) so he is still a little quieter. The volume of the hot water pump is very low. This I operate with an old notebook power supply with 19V. I bought the 24V version, there is also a 12V version. The power supply is the loudest component.
The radiator I bought used. Keep in mind that in the radiator may be impurities which are then deposited in the bucket. This was not a big problem, but I recommend to consider this and maybe install a filter in the beginning. In the oil I also operate a small fan that circulates the oil. Thus, the temperature in the bucket is evenly distributed.
After about 3 hours, the system is at
... keep reading on reddit β‘Is there any technology that would allow waste heat from industries to be efficiently converted back to electricity?
For example, crypto miners are constantly battling heat and use more energy to dissipate the heat from their system to make it run more efficiently.
Rather than spending more energy on cooling the system, is there any sort of technology that could make use of this heat?
Has anyone made their own waste oil heater for hold, shop, livestock space? Iβm looking and finding totally unaffordable options on the market.
Hi all, I have 3 S19s in a garage producing significant heat which is currently wasted and ducted to the outside!
Anyone has any good suggestions for using the low grade waste heat for some useful purpose?
I have thought about heating up the house with it. Currently have 9kW of heat to use somehow. There might be clever ways of making use of it!
Like in a gas car, you get the heat "for free" because the engine is already hot, whereas with home heating you're burning fuel only for heating.
In our bodies, what's the split between "engine heat" and "heater heat" - assuming an adult at rest at room temperature.
Another way of phrasing it: how many calories a day do we spend just keeping warm?
Fire is a rapid redox reaction, where the hasty combination of oxygen and carbon is so fast that the waste heat is enough to ionize the surrounding gas into plasma. Cellular respiration is also a redox reaction, albeit a much slower one. *
The size of a fire and its correlation to the life span of said fire is similar to the correlation of the size of life and its lifespan, although both are imperfect correlations, not causations. * *
Fire and life can also be compared and contrasted according to their size, lifespan, and energy output. The average human lifespan is 72.6 years or 26517.15 days. The bare minimum calories per day for a human is 1200, a reasonable average would be 2500, and an overestimation could be said to be 5000. The mean of the three resulting numbers(31820580, 132585750, and 66292875) gives us a good estimation of 76899735 calories in a human's life. If we define a calorie as "the amount of heat required at a pressure of 1 standard atmosphere to raise the temperature of 1 gram of water 1Β° Celsius" or ~4.2 joules, then that is approximately 322 Megajoules or the equivalent of 169555.54 celsius. If the average temperature of an fire is around 1500 degrees celsius- I had to perform some funky math by averaging several supposed common temperatures for fire- that means... Uhm... 3 megajoules... 833 and a third watthours... 107 hours of fire? Fires can last somewhere from a day to forty, so... like 500 hours or 4.5 human lifespans. We could measure other animals like this, but I am not going to. Sources? * * * * * * * [*](https://facethefactsu
... keep reading on reddit β‘In the colonizing the sun episode Arthur briefly mentioned the idea of using wormholes to remove heat, and anyone who has watched the show long enough knows that disposing of heat is the main limiter for advanced civilizations. The question this got me asking is where would his heat be sent? Heat is a waste product, but just as scrap metal can be recycled, heat can be used. Colonists of an incredibly cold lightless planet might gladly accept some of this waste heat for heating as well as an energy source using a heat engine, with the massive amount of heat produced by civilizations; it might even be used to warm a planet itself.
[I am not a stoner, but I heard you guys might like this!]
Fire is a rapid redox reaction, where the hasty combination of oxygen and carbon is so fast that the waste heat is enough to ionize the surrounding gas into plasma. Cellular respiration is also a redox reaction, albeit a much slower one. *
The size of a fire and its correlation to the life span of said fire is similar to the correlation of the size of life and its lifespan, although both are imperfect correlations, not causations. * *
Fire and life can also be compared and contrasted according to their size, lifespan, and energy output. The average human lifespan is 72.6 years or 26517.15 days. The bare minimum calories per day for a human is 1200, a reasonable average would be 2500, and an overestimation could be said to be 5000. The mean of the three resulting numbers(31820580, 132585750, and 66292875) gives us a good estimation of 76899735 calories in a human's life. If we define a calorie as "the amount of heat required at a pressure of 1 standard atmosphere to raise the temperature of 1 gram of water 1Β° Celsius" or ~4.2 joules, then that is approximately 322 Megajoules or the equivalent of 169555.54 celsius. If the average temperature of an fire is around 1500 degrees celsius- I had to perform some funky math by averaging several supposed common temperatures for fire- that means... Uhm... 3 megajoules... 833 and a third watthours... 107 hours of fire? Fires can last somewhere from a day to forty, so... like 500 hours or 4.5 human lifespans. We could measure other animals like this, but I am not going to. Sources? * * * * * * [*](https://hextobinary.com/un
... keep reading on reddit β‘