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Alex Ar [27]
2 years ago
7

An average person produce 0.25 kg of moisture while taking a shower and 0.05 kg while bathing in a tub. Consider a family of fou

r who each shower once a day in a bathroom that is not ventilated. Taking the heat of vaporization of water to be 2450 kJ/kg, determine the contribution of showers to the latent heat load of the air conditioner per day in summer?
Engineering
1 answer:
Gre4nikov [31]2 years ago
7 0

Answer:

Q = 2450 KJ/day

Explanation:

We are given;

The amount of moisture produced by a person while taking shower; m = 0.25 kg/person

Total number of persons in the family; N = 4

Latent heat of vaporization of water:

h_fg = 2450 KJ/kg

Since amount of moisture per person is 0.25kg per day,thus for 4 people, total mass; m_total = 4 x 0.25 = 1 kg per day

The formula for the amount of latent heat added to the space due to shower per day, is given as;

Q = m_total x h_fg

Plugging in the relevant values;

Q = 1 x 2450 = 2450 KJ/day

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A flat-plate solar collector is used to heat water by having water flow through tubes attached at the back of the thin solar abs
-BARSIC- [3]

Answer:

dT = 21.35 C

Explanation:

Given:

- Area of the absorber plate A = 2 m^2

- e= a = 0.9

- T_s = 35 C

- q''_solar = 500 W/m^2

- T_surr = 0 C

- h = 5 W/m^2 K

- T_amb = 25 C

- flow(m) = 5 g/s

- c_p = 4.2 KJ/kgK

Find:

- The temperature rise of water.

Solution:

- Using Energy balance on the plate:

                                   E_in - E_out = q_in

- Find E_in and E_out:

                                   E_in = a*q''_solar

                            E_out = q"_convec + q"_rad

                   E_out = h*(T_s - T_amb) + e*σ*(T_s^4 - T_surr^4)

- Compute E_in and E_out:

                            E_in = 0.9*(500) = 450 W/m^2

         E_out = 5*(35 - 25) + 0.9*5.67*10^-8*(308^4 - 273^4)

                                E_out = 225.778 W/m^2

- Hence,

                                  E_in - E_out = q_in

                                 450 - 225.778 = q_in

                                  q_in = 224 W/m^2

- Assuming thickness of plate and pipe through which water flows as negligible, then:

                                flow(m)*c_p*(dT) = q_in*A

                                dT = q_in*A / flow(m)*c_p

- plug values in:

                                    dT = 224*2 / 5*4.2

                                    dT = 21.35 C

                     

                 

                             

3 0
2 years ago
1. A sine wave is to be used for two different signaling schemes: a. PSK b. QPSK The duration of a signal element is 10-5 s. If
olchik [2.2K]

Question

A sine wave is to be used for two different signaling schemes: a. PSK b. QPSK The duration of a signal element is 10^-5 s. If the received signal is of the following form: s(t) = 0.005sin(2π10^6t + θ) And if the measured noise power at the receiver is 2.5 x 10-8 watts, determine the Eb/N0 (in dB) for each case.

Answer:

a. 27dB

b. 24dB

Explanation:

a.

For case 1;

Given

Amplitude = A = 0.005

Let

t1 = Signal element period

t2= Bit period

Such that t1 = t2 = 10^-5 sec

Noise Power = 2.5 * 10^-8 W

Calculating N°

N°= N * t1= 2.5 *10^-8 * 10-5 =

N° = 2.5E-13

Calculating Eb

Eb= P * t2

Where P = 25E-6 1/t1 ∫s²(t) {t1,0}

P = 1/10^-5 * 25E-6 ∫ sin²(2π10^6t + θ) dt {10^-5,0}

Sin²θ = ½(1 - cos2θ)

P = 10^5 * 25E-6 ∫½(1 - cos(4π10^6t + 2θ)) dt {10^-5,0}

P = 10^5 * ½ * 25E-6∫(1 - cos(4π10^6t + 2θ)) dt {10^-5,0}

P = 10^5 * ½ * 25E-6 * t {10^-5,0}

P = 10^5 * ½ * 25E-6 * (10^-5 - 0)

P = 10^5 * ½ * 25E-6 * 10^-5

P = ½ * 25E-6

Eb= P * t2

Eb = ½ * 25E-6 * 10^-5

Eb = 12.5E-11

Eb/N° = 12.5E-11/2.5E-13

Eb/N° = 500

Convert to dB

= 10Log(500)

= 27dB

b.

For case 2;

Amplitude = A = 0.005

Let

t1 = Signal element period

t2= Bit period

Such that t2 = ½t1 = 10^-5 sec

Eb = P * ½t1

N° = 2.5 E-8 * t1

Eb/N° = 25E-6 * ½t1/2.5E-8 * t1

Eb/N° = 250

Convert to dB

10Log(250) = 24dB

4 0
2 years ago
A 60 Hz three-phase 115kV transmission line has a series impedance of 30+j150 ohms/phase. The shunt susceptance of this line is
bearhunter [10]

The complete and the correct format for the question is as follows:

A 60 Hz three-phase 115kV transmission line has a series impedance of 30+j150 ohms/phase. The shunt susceptance of this line is \dfrac{B_c}{2} = 4 \ mhos /phase

The line to neutral voltages at buses p and q are and respectively. Compute , the three-phase real power losses in MW for this transmission circuit.

Answer:

0.183 MW

Explanation:

The diagrammatic illustration of the given information can be seen in the image attached below:

Thus: the current in the network can be computed as:

I =\dfrac{V_p-V_q}{Z +\dfrac{1}{Y}}

I =\dfrac{63.51 \times 10^3 \angle 6^0-656.06 \times 10^3 \angle 0^0 }{30 + j 150 -j0.125}

I  = 45.173 \angle 27.28^0 \ A

The P_{loss can be computed as:

P_{loss} = 3 \times I^2 \times  R

P_{loss} = 3 \begin {bmatrix} 45.173 \end {bmatrix} ^2  \times 30

Finally; the three-phase real power loss is:

P_{loss \ of  \ sphere} = 0.183  \ MW

5 0
2 years ago
Which requirement is an appropriate reason for a business to use information technology (IT) tools
uysha [10]

Answer:

hmmm

Explanation:

With more innovation in technology, new businesses are created. With more business, technology comes to the rescue by making things easier. The two exist in something of a symbiotic relationship that ensures they will always coexist.

Business has been around since prehistoric times. It may have begun with nothing more than barter trade, if the history books are to be believed, but it has since morphed into something far more complex, and none of that would have been possible without technology. The major industries of the world would collapse, if the existence and use of information technology were to be snatched suddenly from businesses. That's because most business transactions and operations cannot be conducted in the 21st century without technology.

Technology Is Necessary in Business

Over the years, technology has caused an explosion in commerce and trade. Because of technology, many traditional business models and concepts were revolutionized. Technology gave us the opportunity to see things from a new perspective, and to approach what we were already doing from a new perspective. Technology also gave us greater efficiency for conducting business.

Some of the areas in which technology is crucial to business include point of sales systems, the use of ICT in management, accounting systems, and other complex aspects of every day business activities. Even something as simple as the calculator, which was revolutionary in its time, came about because of technology. It is tough to imagine going back to performing tasks manually. It would take us back about 100 or so years.

Technology as a Source of Support and Security

Technology enables us to automate numerous processes, which thereby increases our productivity. This is possible because it enables us to use fewer resources, thereby enabling us to improve on quality at a low cost and to improve the speed with which we can deliver to customers. In the process, it has become possible to serve even more clients.

Technology also makes it easy to store more information while maintaining the integrity of that information. We are better able to store sensitive and confidential information in a way that makes it less vulnerable to a data breach. The information can be retrieved instantly when needed, and it can be analyzed not only to study past trends but also to forecast the future. In turn, this can help with the decision-making process.

Technology as a Link to the World

Communication is a part of business. So, transportation and processes make business a web of complicated processes that interplay with each other. With technology, it has been possible to globalize business operations. Now, just about anyone can do business practically anywhere, from any room in their house..

Technology has made it possible for businesses to have a wider reach in the world. The best example of this is the internet and the World Wide Web. The internet is now a crucial part of any businesses’ marketing campaign, as it enables the business to attract customers world wide.

Technology, when well-integrated with business, has made life itself worth living. It would be foolish to deny, however, that there are also threats to business brought about by technology. These include malicious activities by activities and organizations, such as hacking. Because of this, it is important for businesses to exercise responsibility when using technology to conduct business. With the good that technology brings, there is some bad that must also be dealt with. All the same, it is something that's worth all of the baggage, and we must acknowledge and responsibly utilize it to make our businesses better.

How Does Information Technology Affect Business?

The Industrial Revolution changed things in the business world, making a lot of processes more efficient and increasing productivity a hundred-fold. However, the business world remained somewhat stagnant for a century after. With the technological revolution, and the use of technology in business, however, things changed even more disruptively than during the Industrial Revolution and it would be safe to say that things will never be the same again. The rate at which technology is evolving and adapting is exponential to the point where all businesses are being swept by the wave, whether they are ready for it or not. It might not seem like we’ve made that much progress, but even just 5 years ago, social media did not have any consumerism, mobile phones weren’t used for business, cloud-based solutions did not exist, the App Generation was not born yet, and omni-channel marketing was taking its baby steps.

Technology has just about changed every aspect of business in a big way and this has never happened this fast before in history. To be more specific, here are a few ways in which information technology has affected business:

4 0
2 years ago
A sample of normally consolidated clay was subjected to a CU triaxial compression test that was carried out until the specimen f
QveST [7]

Answer:

Check the explanation

Explanation:

Given

1) CU traixial compression test

2) Devatoric stress at failure  = бd = 50 kN/m^2

3) Confining pressure at failure  = бd = 48 kN/m^2

4) Pore pressure at failure  = u = 18 kN/m^2

5) Unconfined compression stress  = q = 20 kN/m^2

6) Undrained cohesion  = q/2 = 20 kN/m^2

To find:

1) Effective and total stress strength failure envelope

Kindly check the attached image below .

7 0
2 years ago
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