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
Pie
4 years ago
12

An air conditioner using refrigerant R-134a as the working fluid and operating on the ideal vapor-compression refrigeration cycl

e is to maintain a space at 22°C while operating its condenser at 1000 kPa.
a. Determine the COP of the system when a temperature difference of 2°C is allowed for the transfer of heat in the evaporator.
Engineering
1 answer:
Oduvanchick [21]4 years ago
6 0

Answer:

COP=13.37

Explanation:

Considering the allowed temperature difference the temperature in the evaporator will be 20°. The enthalpy and entropy at this temperature are obtained from table for the saturated vapor phase:

h_1=261.64 kJ/kg

s_1=0.92254 kJ/kgK

The enthalpy at state 2 is determined from the given condenser pressure and the condition s_2 = s_1 with data from table using interpolation:  

h_2=273.18 kJ/kg

The enthalpy at states 3 and 4 is determined from the saturated liquid value for the condenser pressure from table:  

h_3=h_4=107.34 kJ/kg

the COP is then:

COP=qL/w

       = h_1- h_4/ h_2- h_1

       =13.37

You might be interested in
An aircraft component is fabricated from an aluminum alloy that has a plane strain fracture toughness of 40 MPa . It has been de
goblinko [34]

Answer:

a fracture will occur, because the Kc value is greater than the KIC (48.9901 MPa > 40 MPa)

Explanation:

the solution is in the attached Word file

Download docx
7 0
3 years ago
According to the place-time model of interaction, when people are in the same place, but at different times, this is an example
STALIN [3.7K]

Answer: Shift work communication.

Explanation:

Shift work communication is a type of communication that exist between shift workers, or people at different time zones.

Shift work consists of a three eight hours shift within 24 hours.

Keeping up with a shift work communication requires planning, time management and commitment. It also requires using various communication channels.

3 0
3 years ago
How can I start a new project on solar panels building?​
Alborosie

Answer:so you can start by thinking about it and creating ideas that work well with it

Explanation:

Try u can do it

3 0
4 years ago
What can be used to measure the alcohol content in gasoline? A. Graduated cylinder B. Electronic tester C. Scan tool D. Either a
Dovator [93]

Answer:

GRADUATED CYLINDER

Explanation:

4 0
3 years ago
Draw a 3-D physical structure of an NMOS transistor. Label four terminals: body, drain, gate, and source. And also label silicon
Vanyuwa [196]

Answer:

Answer is attached.

Explanation:

A NMOS is a n-channel MOSFET or Metal Oxide

Semiconductor Field Effect Transistor. This type

of transistor might be an enhancement or

depletion type nMOS transistor designed using

layers of Metal-oxide, Silicon-oxide and Silicon

fabricated on a substrate.

4 0
3 years ago
Other questions:
  • A mass of 2 kg is suspended from a vertical spring of stiffness 15 kN/m and subject to viscous damping of 5 Ns/m. What is the am
    9·1 answer
  • A horizontal curve is to be designed for a two-lane road in mountainous terrain. The following data are known: Intersection angl
    7·1 answer
  • You use a horizontal, 4 mm diameter, 100 mm long heater rod to boil water under atmospheric pressure. The rod material is of emi
    13·1 answer
  • A 11.5 nC charge is at x = 0cm and a -1.2 nC charge is at x = 3 cm ..At what position or positions on the x-axis is the electric
    5·1 answer
  • Why does an object under forced convection reach a steady-state faster than an object subjected to free-convection?
    5·1 answer
  • PLEASE ANSWER
    6·2 answers
  • A tailgate may have a latch on both sides.<br> O True<br> O False
    10·2 answers
  • What are the functions of the peripheral nervous system
    6·2 answers
  • The seers were of the opinion that_____ . *
    14·1 answer
  • A vehicle is towed into a shop with a thrown serpentine belt.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!