Light wrote:buggy123 wrote:Increasing the temperature would only increase the power generation rate and the power density of storage tanks. Steam engines always consume steam efficiently, if it's under-temp they produce less or consume more, if its over-temp they consume less. Paragraph from the factorio wiki
Seems you didn't read my second paragraph, which states exactly what you're saying here. But it's good to know you read the wiki's single paragraph, so I'll make a single paragraph for you. Additional joules of energy from the increased heat will only make it easier to keep engines fueled with fewer boilers running, thus reducing their power consumption due to a lower ratio of boilers to steam engines. This will negate the power requirement since they will create more power than they use combined, which is not the case as it is right now.
No, the power consumption will not change unless the
efficiency is changed. It could produce 5000c steam, but so long as efficiency is held constant it wouldn't have lower power consumption compared to boilers producing a equivalent amount of lower-temperature steam. The
only thing that changes with increasing steam temperature is that the power density increases overall. Storage tanks store more power, less boilers are required for the same rate of power accumulation, and fewer steam engines are required( assuming they can handle the temperature). In other words, the only benefit is that you need less space and initial material investment, and space, tanks, boilers, and steam engines are all cheap.
On the other hand, if you
do increase the temperature electric boilers put out, you increase the effective power requirements (and thus effective pollution) of any steam-cracking recipe, because those recipes don't care about the temperature of steam. For example, a steam cracker converting methane to methanol requires 50 steam and 200 KW, and the process takes 4 seconds on a tier-1 cracker. Steam contains 200 joules per unit per degree, starting at the base temperature of 15 °C. By default, electric boilers produce 165 °C steam, which holds 30 KJ per unit, and
requires 30 KJ/0.8=37.5 KJ to produce because of the 80% efficiency. Thus each steam cracking operation
effectively requires 4*200+37.5*50=800+1875=2675 KJ. The steam is over 2/3rds of the energy required, and as you use higher-tier crackers the effective electrical power consumption only decreases.
A tier-1 boiler produces approximately 27.7 pollution units per 1.8 MW of power, thus you get ~15.4 pollution per MW. If it was powering a electric boiler producing steam for the tier-1 cracker from earlier, you would get about 2.675*15.4=~41 pollution units per operation, ignoring the pollution of the cracker itself. A electric boiler consumes 1.2 MW, and thus at 37.5 KJ/unit it produces 32 units of steam per second. As it produces 22.2 pollution per second, you get about 0.7 pollution per unit of steam. Thus a steam cracking operation produces 41+0.7*50=76 pollution units per operation.
If we increase the temperature of the electric boiler to 315 °C, the energy it holds doubles, and thus the energy required to produce it is 75 KJ. The energy per cracking operation is thus 4*200+75*50=4550 KJ. The pollution produced, ignoring the irrelevant pollution from the cracker itself, is thus 4.55*15.4=~70 pollution units. If we simultaneously remove the pollution from the electric boiler, then the pollution has only changed by about -10%.
So clearly, removing the pollution use of the boiler and increasing the temperature
would work. The exact numbers vary depending on what tier of machines and boilers you use, but it would still be a functional alternative. If we increased the temperature of steam to 315, it
would double the energy density of storage tanks, and allow steam engines of various tiers to either produce more power or use less steam per second (
without increasing efficiency). I still fail to see this as a issue,
especially if we use Factorissimo and Angel's Pressure Tanks (both of which are very commonly used with Angels).
For instance, a tier-3 Factorissimo building is 60x60 tiles internally. Pressure tanks are 5x5 and hold 350k. Thus it could hold a 12x12 square of them. If we reduce that to 11x11 to ensure we can pipe steam in/out, that is (11*11)*(350,000 units)*(30 KJ per unit)=1270.5 GJ of storage. Enough to power a 1GW factory for 20 minutes, for a cost of 6050 iron plates and 2420 steel and stone brick for the tanks. You would need a second building to charge it with electric boilers, and a third to hold the steam engines, but for comparison here's my 7-building power generation system:
And here's that collection of buildings, and the rest of my factory, compared to the space i have available:
Suffice it to say, with this very common mod configuration, I consider power-storage a complete non-issue.