Thermodynamics total engine displacement help

In summary, we have discussed the specifications and operation of two different refrigeration cycles - an ideal dry compression cycle using refrigerant 134a and an ideal wet compression cycle using Refrigerant-22. For the dry compression cycle, we calculated the enthalpy at state 3, compressor power, rate of heat transfer (Qin), rate of heat transfer (Qrej), COP, and COR. Similarly, for the wet compression cycle, we determined the compressor power, rate of heat transfer (Qin), rate of heat transfer (Qrej), COP, and COR. We used various equations and conversions to arrive at these values and provided step-by-step solutions with units for each calculation.
  • #1
Matrixhunter
3
0

Homework Statement


A 6 cylinder engine has cylinders wirh a bore of 115mm and a stroke of 145mm Each cylinder also has a clearance volume of 300 cubic centimeter. This engine operates on a four stroke ideal otto cycle and at 3000 rpm. The temperature and pressure of the intake air is 25 Celsius and 101kPa respectively. In addition, 900 kJ/kg of heat is rejected during the constant volume heat rejection process. Determine the following
A. total engine displacement
B. Compression ratio for this engine
C. P, V, T, at the four states
D. Wkcycle
E. Power of engine
F. Total heat added per second Qin
G. Efficiency

Homework Equations


Not sure

The Attempt at a Solution


None
Please answer this problem for me step by step with units and coversions with the equations used i need every single detail
 
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  • #2
An ideal dry compression refrigeration cycle operates at steady state with refrigerant 134a as the working fluid . Saturated vapor enters the compressor at -10C and saturated liquid leaves the condenser at 25C. The mass flow rate of refrigerant is 5 kg/min Determine
A) enthalpy at state 3
B) the compressor power in kW
C) Rate of heat transfer (Qin) in kJ/s
D) Rate of heat transfer (Qrej) in kJ/s
E) COP
F) COR
Please include step by step with units and conversions and equations i need every detail
 
  • #3
An air conditioner operates on an ideal wet compression cycle using Refrigerant-22. the refrigerant is at -5 Celsius in the evaporator and 40 Celsius in the condensor. if the mass flow rate of the refrigerant is 5kg/min, determine:
A) the compressor power in kW
B) rate of heat transfer (Qin) in kJ/s
C) rate of heat transfer (Qrej) in kJ/s
D) COP
E) COR

i need every single step with units and coversions and all the equations used i need every detail
 

FAQ: Thermodynamics total engine displacement help

1. What is thermodynamics and how does it relate to engine displacement?

Thermodynamics is the study of energy and its transfer between systems. In the context of engines, it involves studying how energy is converted into mechanical work. Engine displacement is a measurement of the total volume of air and fuel mixture that an engine can combust in a single cycle, which is an important factor in determining the efficiency of energy conversion.

2. How does total engine displacement affect the performance of a vehicle?

The total engine displacement directly affects the power and torque output of a vehicle. Generally, a larger engine displacement results in a higher power output, allowing for faster acceleration and higher top speeds. However, this also means that the vehicle will consume more fuel and emit more pollutants.

3. How is engine displacement calculated?

Engine displacement is calculated by multiplying the cross-sectional area of the cylinder bore by the stroke length. This measurement is usually expressed in liters (L) or cubic centimeters (cc). For example, a 2.0L engine has a total displacement of 2000 cc.

4. Can engine displacement be increased to improve performance?

Technically, yes. Increasing the engine displacement by increasing the size of the cylinders or adding more cylinders can result in a higher power output. However, this also means increased fuel consumption and emissions. Additionally, modifying the engine displacement may require other modifications to the engine components and can be a complex and expensive process.

5. Does the total engine displacement affect fuel efficiency?

Yes, the total engine displacement is a major factor in determining the fuel efficiency of a vehicle. Generally, a larger engine displacement results in a lower fuel efficiency due to the increased fuel consumption needed to produce more power. However, advancements in engine technology and design can also play a significant role in improving fuel efficiency regardless of engine displacement.

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