Questions tagged [power-engineering]
The power-engineering tag has no summary.
75 questions
0 votes
2 answers
89 views
Isolating transfromer
How does current flow in each condition (normal, red, and buzzer) in this hospital isolated power system diagram
0 votes
0 answers
60 views
Charging a Battery Energy Storage System (BESS: 600MW/ 1200MWh) with a Higher rated Power Plant (1200MW)
A project mentions requirement of setting up a 1200MW solar power plant with atleast 600MW/1200MWh BESS system. The BESS is to be charged exclusively with solar power. My confusion is what if the ...
0 votes
1 answer
88 views
Converting RMS to Maximum Power
If I have a sinusoidal voltage signal of amplitude $V_m$ driving a resistance $R$, what is the relationship between the RMS power $P_{rms}$ and the maximum power $P_{max}$ delivered to the resistance? ...
- 1
1 vote
1 answer
75 views
Can I use a UPS in front of my A/C heat pump, to reduce surges in the house?
Hopefully this is on-topic here. I'm open if I should as on another SE site. We have an air conditioner heat pump outside, typical to most homes with one. When it kicks on, many of the lights dim for ...
- 204
3 votes
4 answers
233 views
Why do kWh (smart) meters have a maximum operating altitude?
At first I thought it was a bad translation from Chinese to English, but it turns out that many data-sheets of kWh power meters mention a maximum altitude, usually below 2 or 3 km. For example: ...
- 265
0 votes
1 answer
89 views
natural gas-fired power plants
I live in Tunisia, a country of 12 million inhabitants where natural gas (provided essentially by Algeria) is used in power plants. I'd like to know how it is that natural gas can contain so much ...
- 123
1 vote
2 answers
291 views
What will be the destiny of the oxygen gas created in the future hydrogen economy?
When I was recently studying biomass-to-electricity (gasification methods, Drax power station...), I was wondering whether the efficiencies of these systems would not benefit from a source of pure ...
- 140
0 votes
1 answer
82 views
What properties are most important for a fluid in the generation of steam power?
I was curious if water is the most efficient fluid for use in generating steam power. I thought it might be, since it has the highest latent heat of evaporation of any fluid. I wasn't sure if other ...
-1 votes
1 answer
49 views
How are a Horizontal Axis Wind Turbine's blades joined to the hub, allowing them to rotate?
I know its a basic question for this site. But I couldn't find the answer on google so I beseech thee.
- 109
1 vote
3 answers
379 views
Would it be possible to generate electricity from continental drift?
It definitely wouldn't be practical compared to other sources of energy, but given currently plausible technology, would it be theoretically possible to use the movement of tectonic plates (as in ...
0 votes
2 answers
91 views
Automatic car applying (seemingly) more torque upon throttle "liftoff"?
I drive a relatively average powered automatic transmission front-wheel drive car; my (naturally aspirated) engine delivers maximum torque at around 5000 RPM. I performed the following test (remaining ...
- 103
0 votes
1 answer
75 views
How to find pixel density in LED Display Board?
How to find pixel density in LED Display Board? How do we compare pixel per inch and dots per inch? In this example, a screen of 16'x9' is shown. How did they calculate 4875x2710P and 975x548p and so ...
- 57
0 votes
1 answer
185 views
Basic questions about power grid stability with variable loads and sources
I am curious about integration of renewable energy in electricity grids. I am a mechanical engineer and understand energy and power but I have little knowledge about electricity. I will be thankful if ...
- 148
0 votes
2 answers
755 views
Doubt on a shaft-turbine-generator system
Consider a shaft which connects a turbine to a generator. Initially, none of the parts are moving. Now the turbine starts to rotate and the torques act on the shaft from both the turbine and generator ...
- 869
0 votes
1 answer
91 views
Power systems unclear voltages
I was looking at this problem: "A balanced delta connected impedance load with (12+j9)Ω per phase is supplied by a balanced three-phase 60 Hz, 208-V source " I do not wish to ask for help at ...
- 267