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r-ruslan [8.4K]
3 years ago
12

Description: An apartment building has a pumped ring main that circulates hot water at 75 C through insulated 40 mm pipe with he

at loss of 17 Watts/metre. At each apartment, this hot water is mixed with cold water to a delivery temperature of 50C? One of the sub-questions provides extra info: It takes 0.00119 kWh/degree/litre to heat water from 15C to 50C.
My problem:

With typical water-efficient shower and taps, typical Melbourne usage of hot water is 44 litres/day/person. For typical occupancy of 1.8 people, what is the effective efficiency of this hot water distribution system (for simplicity assume the existing heating system feeding the distribution system is 100% efficient).? Note that this efficiency calculation ignores the efficiency of production of hot water.

If anyone can help me or if anyone has any idea that would be great!

Thanks :)
Engineering
1 answer:
Ratling [72]3 years ago
7 0

Answer:

hfhhfhff

Explanation:

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The nuclear reactions resulting from thermal neutron absorption in boron and cadmium are 10B5 + 1 n0 ï  7Li3 + 4He2 113Cd48 + 1
kirill115 [55]

Solution :

The nuclear reaction for boron is given as :

$^{10}\textrm{B}_5 + ^{1}\textrm{n}_0 \rightarrow ^{7}\textrm{Li}_3 + ^{4}\textrm{He}_2$

And the reaction for Cadmium is :

$^{113}\textrm{Cd}_48 + ^{1}\textrm{n}_0 \rightarrow ^{114}\textrm{Cd}_48 + \gamma [5 \ \textrm{MeV}]$

We know that it is easier that to shield or stop an alpha particle (i.e. He nucli) as they can be stopped or obstructed by only a few centimetres of the material. However, the gamma rays ( γ ) can penetrate through the material to a greater distance. Therefore, we can choose the first one.

6 0
3 years ago
What advantage might there be to having the encoder located on the motor side of the gearhead instead of at the output shaft of
pickupchik [31]

The most accurate answer to that process is definitely precision. The Rotary encoder is an electro-mechanical device that converts the angular position or motion of a shaft or axle to analog or digital output signals. The efficiency of these devices is subject to the position and angle of the axis in front of the encoder.

Most cars use reduction systems in their gearboxes that convert a certain signal input into an output. Mechanically for example, a 20: 1 reduction box already infers that if there is a revolution in the input at the output there are 20. That same transferred to the encoder pulses would imply greater precision.

For example a decoder with 50 holes would have to read 1000 pulses (50 * 20) which is basically a degree of accuracy of 0.36 degrees. In this way it is possible to conclude that if the assembly of the encoder is carried out next to the motor and not at the output, it can be provided with greater precision at the time of reading.

7 0
4 years ago
Relationship between civil engineering and geology​
natka813 [3]

Answer:

Geological and civil engineers sometimes work together, but have very different responsibilities. While geological engineers study the earth's inner and outer surface to evaluate potential mining and infrastructure construction sites, civil engineers design the infrastructure to be built.

5 0
3 years ago
Technician A says that a 12 Volt light bulb that draws 12 amps has a power output of 1 watt. Technician B says that a motor that
Artemon [7]

Answer:

Technician B

Explanation:

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Therefore, R=\frac {12}{12}=1 ohm

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Therefore, the power is 144 W and resistance is 1 Ohm. This implies that technician A is wrong while technician B is correct

6 0
4 years ago
Design roller chain drive. Specify the chain size, the sizes and number of teeth in the sprockets, the number of chain pitches,
Rom4ik [11]

Answer:

The total design can be summarized as follows:

AC motor 55 hp, 750 rpm  as a driver

Service factor 1.0

Design power 5 hp

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39 teeth, 7.46 in pitch dia, 1 strand large sprocket

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Type B lubrication

Explanation:

4 0
3 years ago
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