# Questions tagged [energy]

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### Calculation of the stored energy for a heat storage tank

There is a heat storage tank that is directly loaded from the top and the heat is also taken from the top. The colder water from the heating circuit return flow enters the heat storage tank at the ...
763 views

### What are the differences between compressor stations, pump stations, and booster stations?

I am doing some research on impacts related to natural gas compressor stations. In some states, I've received data for compressor stations alongside other facilities in the oil and gas world. These ...
29 views

I am working on Lagrangian derived high-dimensional motion equations for a robot in matrix form. The structure of such an equation is known: $M(q)\ddot{q}+C(q,\dot{q})\dot{q}+G(q)=0$ In here, $M(q)$, $... 0answers 47 views ### Why do solar cells need to be square-shaped? There were circular solar cells 30 years ago. Why do we have square-shaped solar cells now? Why square? Furthermore, Why do monocrystalline solar cells have rounded/cropped edges? 0answers 49 views ### Why does a system with zero resultant moment turn after temporarily force-tilted? Say a beam, 3m long from end to end, has a pivot placed at its centre of mass, at half its length i.e. 1.5m. Objects with weight 200N each are placed on both ends of the beam. The system is in ... 0answers 20 views ### Why doesn't the Stress Power in the theorem of the expended mechanical power contribute to the kinetic energy? The following is the formula of the expended mechanical power:$P(t)=\frac{d}{dt}\int \frac{1}{2} \rho\ v^2 dV+\int \sigma \colon d\ dV$where$P(t)$is the mechanical power entering ... 0answers 23 views ### How do I correctly model this system of torsion springs? I am currently designing a symmetric parallel mechanism that can be modeled as follows: Here,$\tau^j$denotes actuator moments and$k_i$are torsion springs constants. For a specific point in the ... 0answers 52 views ### Enthalpy vs Heat If we have a closed cylinder filled with a gas and we heat it, by$1^{st}$law we have:$\Delta q=\Delta U$(?) since$\Delta V$= 0. But$\Delta H= \Delta U+ V. \Delta P$. What does that difference ... 1answer 117 views ### What are the conditions for a signal to be an energy signal and a power signal? I know how to find the power and the energy of a signal. What I have a problem with is knowing whether a signal is an energy signal or a power signal. According to my teacher, a signal is a power ... 1answer 21 views ### Understanding "total primary energy supply" I am trying to wrap my head around the diagram and explanation here but can not understand completely how it is computed. https://energyeducation.ca/encyclopedia/Total_primary_energy_supply For ... 0answers 30 views ### How energy intensive is creating artificial islands in the IJsselmeer? The City of Amsterdam is building a series of artificial islands for new housing. One of them is Centrumeiland. Its size is 13 ha. (130,000 m2). Its creation requires 800,000 m3 of sand (Source), i.e. ... 0answers 28 views ### Determine Heating costs in$/kWh for a specific location

Suppose I wanted to find the average heating price for a specific location in the US, where: heating_price: The price of equivalent unit energy intensity of heating energy source (e.g. natural gas), ...
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### Why is the functional of an elastic system equal to it's total potential energy and why is it stationary at it's minimum?

Okay this was even quite difficult to formulate but let's start with some statement's in my FEM book: Elastic continuum has a functional which is equal to it's total potential energy Elastic system ...
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### Ideas on optimization of DRA and energy consumption of a pipeline

I have a 200 mile pipeline with a few pump stations in between. I am trying to find ways to optimize the electricity and DRA consumption, and was wondering if anyone has ever done something similar ...
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Note: I had previously posted this question on the Space and Robotics SE sites, but received little/no response. So I've deleted the previous posts and repasted my question here in the hope of ...
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### What does the author mean? Turbomachinery - Reaction

I am reading a book of Fundamental Energy Systems. The author describes the rate of change in head for a turbomachine as:  \frac{1}{2}[(V_1^2-V_2^2)+(U_1^2-U_2^2)+(V_{R2}^2-V_{R1}^2)] = H =U_1V_{u1} ...
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### Capacity credit vs capacity factor

What is the difference between capacity factor and capacity credit? I know that capacity factor = annual generation / (installed capacity * 8760) but I don't understand how capacity credit is ...