Initially, the room contains 1.2 kg of air at 100 kPa. The steam radiator transfers heat at a rate of 100 kJ/h, and a 10 W fan is used to distribute the warm air in the room. The rate of heat loss from the room is estimated to be about 50 kJ/h. During the process, the pressure is increased linearly until 110 kPa after x of operating hours when the final volume is equal 1.1 m3. You must follow the following steps to help your customer: STEP 1 Assume the air in the room is a perfect gas, explain the relationships between system constants then find the temperature at all states. STEP 2 Describe the operation of the thermodynamic system in Figure 1 and its properties, by constructing a P-V and T-V plots showing the process and the path. STEP 3 Explain the application of the first law of thermodynamics to the system. After that, explain the system parameters in terms of energy forms and interactions using the non-flow energy equation (NFEE) for the system and how they affect other parameters such as the final air temperature. STEP 4 Illustrate the importance of expressions for work done and find the value of the operating hours. STEP 5 Assume that the air pressure is increased in a polytropic process, determine the index of compression, n.
Initially, the room contains 1.2 kg of air at 100 kPa. The steam radiator transfers heat at a rate of 100 kJ/h, and a 10 W fan is used to distribute the warm air in the room. The rate of heat loss from the room is estimated to be about 50 kJ/h. During the process, the pressure is increased linearly until 110 kPa after x of operating hours when the final volume is equal 1.1 m3.
You must follow the following steps to help your customer:
STEP 1
Assume the air in the room is a perfect gas, explain the relationships between system constants then find the temperature at all states.
STEP 2
Describe the operation of the thermodynamic system in Figure 1 and its properties, by constructing a P-V and T-V plots showing the process and the path.
STEP 3
Explain the application of the first law of
STEP 4
Illustrate the importance of expressions for work done and find the value of the operating hours.
STEP 5
Assume that the air pressure is increased in a polytropic process, determine the index of compression, n.
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