What are the temperatures of the evaporator and condenser?

In summary, to find the temperatures of the evaporator and condenser in a vapor-compression refrigeration cycle, the basic vapor-compression refrigeration equation was used. Using the inlet and outlet enthalpy values, the change in enthalpy for the evaporator (qe) and condenser (qc) were calculated. Based on the given inlet and outlet temperatures, the heat load for the evaporator was determined to be 185.978 kJ·kg-1 and for the condenser, it was -251.444 kJ·kg-1.
  • #1
Zheng_
24
1

Homework Statement


By the data given below,
Condenser Inlet Pressure (P1/kPa) 1164
Condenser Inlet Temperature (T1/K) 382.8
Condenser Outlet Pressure (P2/kPa) 1102
Condenser Outlet Temperature (T2/K) 297.2
Evaporator Inlet Pressure (P3/kPa) 290
Evaporator Inlet Temperature (T3/K) 259.5
Evaporator Outlet Pressure (P4/kPa) 268
Evaporator Outlet Temperature (T4/K) 280.5
find the temperatures of the evaporator and condenser in this Vapor-compression refrigeration cycle.
The pressures are calculated in absolute pressure.

Homework Equations


Basic vapor-compression refrigeration equation.[/B]

The Attempt at a Solution


[/B] Tried to solve by using the Inlet and outlet enthalpy based on P-h cycle of the refrigerant
qe = h4-h3 qc = h2-h1
= 415.433 – 229.4556 =229.4556 – 480.9
= 185.978 kJ·kg-1 = -251.444 kJ·kg-1
not sure if it's correct...

 
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  • #2
I think you are supposed to determine the change in enthalpy of the fluid between the inlet and outlet of the device to determine the heat load, based on the inlet and outlet temperatures they gave you. So, in my judgment, your approach is correct.
 

1. What is the difference between the temperatures of the evaporator and condenser?

The evaporator and condenser are two important components in a refrigeration system. The evaporator is responsible for absorbing heat from the surrounding environment, while the condenser releases the heat to the outside. As a result, the temperature of the evaporator is typically lower than the temperature of the condenser.

2. How do the temperatures of the evaporator and condenser affect the efficiency of a refrigeration system?

The temperatures of the evaporator and condenser play a crucial role in the efficiency of a refrigeration system. The larger the temperature difference between the two, the more efficiently the system can transfer heat. This is why it's important to maintain the appropriate temperature difference between the evaporator and condenser for optimal efficiency.

3. What factors can affect the temperatures of the evaporator and condenser?

There are several factors that can impact the temperatures of the evaporator and condenser. These include the design and size of the refrigeration system, the type of refrigerant used, and the ambient temperature. In addition, any malfunction or blockage in the system can also affect the temperatures.

4. Can the temperatures of the evaporator and condenser be adjusted?

Yes, the temperatures of the evaporator and condenser can be adjusted. This can be done by adjusting the refrigerant flow rate, changing the type of refrigerant used, or by making changes to the design of the system. It's important to note that any adjustments should be made carefully to avoid damaging the system or affecting its efficiency.

5. What is the ideal temperature for the evaporator and condenser in a refrigeration system?

The ideal temperature for the evaporator and condenser will vary depending on the specific refrigeration system and its intended use. As a general guideline, the evaporator temperature should be low enough to effectively absorb heat, while the condenser temperature should be high enough to efficiently release heat. It's important to consult the manufacturer's guidelines for the recommended temperatures for a specific system.

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