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3 years ago

QUESTION

Engineering

1 answer:

Ymorist [56]3 years ago

3 0

Torch body if I’m wrong I’m really sorry that’s what I got

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Air is flowing steadily through a cooling section where it is cooled from 30 °C to 15 °C at a rate of 0.25 kg/s.

Lady bird [3.3K]

Answer:

$C_{day} = 2.261\,USD$

Explanation:

The heat transfer rate rejected to the refrigeration system is:

$\dot Q_{L} = (0.25\,\frac{kg}{s} )\cdot (1.005\,\frac{kJ}{kg\cdot ^{\textdegree}C} )\cdot (30\,^{\textdegree}C-15\,^{\textdegree}C)$

$\dot Q_{L} = 3.768\,kW$

The electric power needed to make refrigeration possible is:

$\dot W = \frac{\dot Q_{L}}{COP_{R}}$

$\dot W = \frac{3.768\,kW}{2.8}$

$\dot W = 1.346\,kW$

The daily energy consumption is:

$\Delta E_{day} = (1.346\,kW)\cdot (86400\,s)$

$\Delta E_{day} = 116294.4\,kJ$

$\Delta E_{day} = 32.304\,kWh$

The cost of electricity consumed by the air-conditioner per day is:

$C_{day} = c\cdot \Delta E_{day}$

$C_{day} = (0.07\,\frac{USD}{kWh} )\cdot (32.304\,kWh)$

$C_{day} = 2.261\,USD$

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2) phone

3) snake

Explanation:

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Calculate the scale and speed of the pattern in order to gain useful results for a turbine operate at 150 rev/min at height diff

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3 years ago

A nanometer connected to a pipe indicates a negative gauge pressure of 70mm of mercury .what is the pressure in the pipe in N/m^

prohojiy [21]

Based on the calculations, the absolute pressure in the pipe is equal to 90,670.4‬ N/m².

<h3>How to calculate the absolute pressure?</h3>

Mathematically, absolute pressure can be calculated by using this formula:

$P_{abs} = P_{atm} + P_{guage}$

<u>Scientific data:</u>

Atmospheric pressure (Patm) = 1 bar = 1 × 10⁵ N/m²

Head (h) = -70mmhg = -0.07 m hg

Acceleration due to gravity = 9.8 m/s²

Density of mercury = 13,600 kg/m³.

Next, we would determine the gauge pressure:

$P_{guage} = \rho gh\\\\P_{guage} = -13600 \times 9.8 \times 0.07\\\\P_{guage} = -9,329.6\;N/m^2$

Now, we can calculate the absolute pressure:

$P_{abs} = P_{atm} + P_{guage}\\\\P_{abs} = 1 \times 10^5 - 9329.6$

Absolute pressure = ‭90,670.4‬ N/m².

Read more on absolute pressure here: brainly.com/question/10013312

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