PROBLEM #4: A piston cylinder device contains an ideal gas changed with an initial condition of 120 kPa and a volume of 11.5 m. Final conditions for the gas should be 1320 kPa and 0.85 m?. This can be done by performing any of the following processes, a. Isothermal compression b. Adiabatic compression then isobaric cooling c. Adiabatic compression then isochoric cooling For each of the reversible processes, calculate Q, W. AU and AH.
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- A closed, rigid tank with a volume of 0.6m ^ 3 contans saturated water vapor at900 kPa the nital stale The tar pressures decreased to 300 kPa through heat exchange with the surroundings Question 1 to apply to Problem 1 What is the initial specific volume v, m^ 3 kg ?Water melts as temp increases because : - chemical potential of the liquid is lower than that of gas - liquid and solid form eutectic mixture -chemical potential of the liquid and solid become equal1.1 Determine the electrical power supplied to a boiler when the temperature of the enteringwater is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is anegligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specificheat is c = 4,370 J/(Kg K). There is a 1.5(105) W rate of heat loss from the boiler during this process to asurrounding at 293.2 k. Consider steady state conditions.1.2 Calculate the total rate of entropy production in Problem 1.1.1.3 Calculate the total rate of exergy destruction (W) in Problem 1.1. The dead statetemperature is 293.2 K and pressure is 1 bar.1.4 Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to theconditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The highheating value (HHV) of the fuel is 50.02 MJ/kg.1.5 Calculate the exergy destroyed in the process described by problem 1.4. The exergy…
- 1.1 Determine the electrical power supplied to a boiler when the temperature of the enteringwater is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is anegligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specificheat is c = 4,370 J/(Kg K). There is a 1.5(105) W rate of heat loss from the boiler during this process to asurrounding at 293.2 k. Consider steady state conditions.1.2 Calculate the total rate of entropy production in Problem 1.1.1.3 Calculate the total rate of exergy destruction (W) in Problem 1.1. The dead statetemperature is 293.2 K and pressure is 1 bar.1.4 Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to theconditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The highheating value (HHV) of the fuel is 50.02 MJ/kg.1.5 Calculate the exergy destroyed in the process described by problem 1.4. The exergy…Q3/Answer by true or false : 1) All water systems using fan coil units are suitable in buildings requiring individual room control and consume less space compared to all air systems. 2) All air conditioning systems make use of an economizer. 3) With 100 % re-circulated air, some time, the room ADP is equal to coil ADP and the load on the coil is equal to the load on the room. 4) The sensible load affects dry bulb temperature, while the latent load affects the moisture content of the conditioned space. 5) A single zone, single duct, constant volume system can be used either for cooling or for heating, but not for both cooling and heating simultaneously.A performance test of an ice plant gave the following data: Capacity: 20 tons of ice/day Refrigerant: Ammonia Condenser pressure: 1391.5 kPa Evaporator pressure: 208.26 kPa Raw water temperature: 32OC Harvest temperature: -7OC Block of ice: 300 lb/block The compressor is twin-cylinder, single acting, D/L = 1.25, 450 rpm, mechanical efficiency is 80%. Additional heat load due to infiltration and conduction is 20%. Determine: a) Number of cans needed b) Product cooling load c) Refrigerating capacity in tons of refrigeration d) Amount of refrigerant flow e) Size of motor to drive the compressor f) Bore diameter and length of stroke
- Methanol (SG=0.792) is contained in a large tank under a pressure of 350000 Pa absolute. When a valve on the bottom of the tank is opened, the methanol drains freely though a 0.02 m ID tube whose outlet is 7.00 m below the surface of the methanol. The pressure at the outlet of the discharge pipe is 101325 Pa. Some useful constants and conversions: g = 9.8 m/s2 , Pref = 1000 kg/m3 . a. Draw the system. Label points I and 2 (where you will define A= 2-1) and label the variables with values b Write the general form of the energy balance. Cancel out negligible terms, and state the keyword/assumption to justify. Simplify to the resultant energy balance. c.) Assume the diameter of the tank is very big compared to the drain tube velocity, which make the velocity of liquid in the tank equal to zero. Estimate the methanol discharge velocity in the drain tube in m/s. *hint: divide your EB by m to eliminate m and V. Recall, n = pV = pvA and = v/m=1/pAn A/C plant is designed for a room with the following conditions: outdoor conditions 40 F db / 60% r.h., requiredindoor conditions 70 F db / 50% r.h., amount of air circulation 15 ft^3/min/person, room capacity 50 people. Therequired condition is achieved first by heating and then by adiabatic mixing. Show the pro cess on an e-version ofa psych-chart, and thus determine the following:a. Heating capacity of the coil (BTU/min)b. Capacity of the humidifier (lbm/min)An engineer has been given the following data on a conditioned room: Sensible heat gain 30 kW Latent heat gain 15 kW Supply air 18°C Outdoor air 35°C DB and 24°C WB Desired room condition 27°C DB and 50% RH For ventilation, 15% is outdoor air, the balance of air requirement being recirculated from room conditioned with some portion being by-passed around the cooling coil. There is no reheater, the desired room state is attained by the by-passing of air. It is found that the apparatus DP temperature of coil is 10°C. Find the: a. tons of refrigeration; and b. mass flow rate of the time by-passed air.
- The following parameters are recorded on a gas turbine test rig. Stage-1: Inlet temperature is 5000C, Inlet pressure is 650kPa. Exit gas pressure 150kPa. Determine the exit gas temperature for isentropic process. Stage-2 Gas is again heated to 4500C by constant volume process. Assume R=287 J/kg.K; Determine the heat added to the gas assuming Cp/Cv=1.4 and Cp/Cv=1.3; Draw the T-S diagram for the above process.HVAC UPVOTE WILL BE GIVEN. ANSWERS ARE GIVEN ALREADY. PLEASE WRITE THE COMPLETE SOLUTIONS. 2. A room being air conditioned is held at 25°C db & 50% RH. A flow rate of 5m³/s of supply air at 15°C db & 80% RH is being delivered to the room to maintain steady condition at 100 kpa. What is the sensible heat absorbed from the room air in kw? 2. A room being air conditioned is held at 25°C db & 50% RH. A flow rate of 5m³/s of supply air at 15°C db & 80% RH is being delivered to the room to maintain steady condition at lookpa. What is the sensible heat absorbed from the room air in kw? a) 50.8 b) 60.8 c) 40.5 d) 70.9 c)40.5 d) 70.9Identify what is the system in this problem and write the general energy balance equation (no need to solve) A turbine is driven by a system that enters the turbine at the ff. conditions: 200 kg/h, 39 atm, 501 deg C, 49 m/s linear speed. The steam exits at a point 8 meters below the inlet stream of the turbine with the following conditions: atmospheric pressure, 290 m/s speed. 69000 W of shft work is delivered by the turbine while 100 kcal/h heat is lost. What is the specific delta H?