1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
baherus [9]
3 years ago
14

A heat pump cycle whose coefficient of performance is 2.5 delivers energy by heat transfer to a dwelling at a rate of 20kW.

Engineering
1 answer:
12345 [234]3 years ago
8 0

Answer:

a) 8kW

b) $128

Explanation:

Given the coefficient of performance of the heat pump cycle to be 2.5

Energy delivered by the heat pump = 20kW

a) net power required to operate the heat pump = Energy delivered / coefficient of performance

Net power required = 20/2.5

= 8kW

b) Given the cost of electricity is $0.08 for 1kWhour

Since net power required to operate heat pump = 8kW

If the heat pump operate for 200hours, total power required for a month = 8kW×200hours = 1600kWhour

since 1kWh of electricity costs $0.08, cost of electricity used in a month when the pump operates for 200hour will be 1600kWh×$0.08 which is equivalent to $128

You might be interested in
Complete the following sentence. The skills and content of several subject areas were combined to form a new field known as a me
Svetlanka [38]

Answer:

The answer is "discipline" , I was doing the same thing a minute ago. I hope this anwser is helpful! ^^

Explanation:

5 0
3 years ago
Read 2 more answers
A manometer connected to a Pitot-static tube has a difference in the height of the two columns of water of 10 cm when the Pitot-
kaheart [24]

Answer:

v = 40 m/s

Explanation:

Difference in the height of the two columns:

h_m = \triangle h = 10 cm \\h_m = 0.1 m

Air density, \rho_{air} = 1.225 kg/m^3

Water density, \rho_{w} = 1000 kg/m^3

The velocity of air flow is given by the equation:

v =  \sqrt{2gh_m (\frac{p_w}{p_{air}} - 1) } \\\\v =  \sqrt{2*9.81*0.1 (\frac{1000}{1.225} - 1) }\\\\v = 40 m/s

7 0
4 years ago
Two loads connected in parallel draw a total of 2.4 kW at 0.8 pf lagging from a 120-V rms, 60-Hz line. One load absorbs 1.5 kW a
stealth61 [152]

Answer: a) 0.948 b) 117.5µf

Explanation:

Given the load, a total of 2.4kw and 0.8pf

V= 120V, 60 Hz

P= 2.4 kw, cos θ= 80

P= S sin θ - (p/cos θ) sin θ

= P tan θ(cos^-1 (0.8)

=2.4 tan(36.87)= 1.8KVAR

S= 2.4 + j1. 8KVA

1 load absorbs 1.5 kW at 0.707 pf lagging

P= 1.5 kW, cos θ= 0.707 and θ=45 degree

Q= Ptan θ= tan 45°

Q=P=1.5kw

S1= 1.5 +1.5j KVA

S1 + S2= S

2.4+j1.8= 1.5+1.5j + S2

S2= 0.9 + 0.3j KVA

S2= 0.949= 18.43 °

Pf= cos(18.43°) = 0.948

b.) pf to 0.9, a capacitor is needed.

Pf = 0.9

Cos θ= 0.9

θ= 25.84 °

(WC) V^2= P (tan θ1 - tan θ2)

C= 2400 ( tan (36. 87°) - tan (25.84°)) /2 πf × 120^2

f=60, π=22/7

C= 117.5µf

7 0
3 years ago
Charging the system is being discussed. Technician A says that the refrigerant must be weighed (or metered) to obtain a proper c
andrey2020 [161]

Charging the system is being discussed. Technician A is correct and Technician B is incorrect because overcharging can cause the system to reduce it capacity, but it does not reduce its cooling efficiency.

<h3>What is a coolant?</h3>

The coolants are the liquid that are present in machines to prevent the  heating of the system or machines. Because machine and cars run they generate lots of heat that why there are coolants present.

Thus, the correct option is Technician A.

Learn more about coolant

brainly.com/question/11912897

#SPJ1

7 0
2 years ago
Compression is generally lost in 3 places
natima [27]

Answer:

leak in cylinder head, piston holes, bad valves.

Explanation:

4 0
3 years ago
Other questions:
  • Once Joe Martin reports his concerns to senior management at corporate headquarters and requests that the Ethicana plant operati
    8·1 answer
  • Type the correct answer in the box. Spell all words correctly.
    9·1 answer
  • You need to sort a file of n GB file stored on a hard-drive. Your RAM contains only 5GB. You have a lightning-fast CPU, but writ
    13·1 answer
  • In business applications, you are often asked to compute the mean and standard deviation of data. The mean is simply the average
    9·1 answer
  • Tell me a riddle and whoevers i like best gets brainliest
    6·1 answer
  • What is the type of the car which has no gasoline as a fuel, but hydrogen or water?​
    12·2 answers
  • Name the ferrous metal that most workshop tools are made from??
    12·2 answers
  • Smith wants to get a job in network systems. Which major should he choose to give him the best chance of getting a job?
    14·2 answers
  • State two faults that are common in a simple cell​
    6·2 answers
  • Never operate electric tools outdoors or in wet conditions unless circuit is protected by what?.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!