A metal part is undergoing a heat-treating process, it has a mass of 12 kg and is initially at 950∘C. The part is quenched in a tank containing 225 kg of water, initially at 35∘C. Consider the heat transfer between the tank and its surroundings to be negligible. Taking the specific heat of the metal part and water as constant at 0.5 kJ/kg.K and 4.2 kJ/kg.K respectively, determine : The final equilibrium temperature after quenching Tf= ∘C The amount of entropy produced within the tank Sgen= kJ/K
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A metal part is undergoing a heat-treating process, it has a
mass of 12 kg and...
Problem 3 A rigid 6L-tank contains 3.3 kg of water initially at 30°C. The tank is...
Problem 3 A rigid 6L-tank contains 3.3 kg of water initially at 30°C. The tank is heated to 175°C by a heat pump that receives heat from surroundings transfer to the water, (b) the change in entropy at 25°C. The process is reversible. Find (a) the heat
Problem 3 A rigid 6L-tank contains 3.3 kg of water initially at 30°C. The tank is heated to 175°C by a heat pump that receives heat from surroundings transfer to the water, (b)...
A 34 kg iron block and a 48-kg copper block, both initially at 80°C, are dropped...
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A 70-kg copper block initially at 140'C is dropped into an insulated tank that contains 90 L of water at 10'C. Determine the final equilibrium temperature and the total entropy change for this process. The specific heat of water at 25°C is cp=418 kJ/kg-K. The density of water is 997 kg/m2. The specific heat of copper at 27°C is Cp=0.386 kJ/kg.K. Water Copper 90 L The final equilibrium temperature is OK The total entropy change during this process is OKJ/K.
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A sealed rigid tank has 0.1 kg saturated vapor R-410a at 0°C that is cooled to...
A sealed rigid tank has 0.1 kg saturated vapor R-410a at 0°C that is cooled to 20°C by a 20°C heat sink. Thermodynamic properties of R410a at initial and final states are given as: u1 = 253.02 kJ/kg, 51 -1.0368 kJ/kg.k ; u2 - 136.5 kJ/kg; 52 - 0.5946 kJ/kg.K .. Find the heat transfer during the cooling process. b. Calculate the change in entropy of the R-410a c. Determine the change in entropy of heat sink, a. Estimate the...
6.) A closed, rigid tank contains 5 kg of air initially at 300 K, 1 bar....
6.) A closed, rigid tank contains 5 kg of air initially at 300 K, 1 bar. The diagram below shows a tank in contact with a thermal reservoir at 600 K and heat transfer occurs at the boundary where the temperature is 600 K. A stirring rod transfers 600 kJ of energy to the air. The final temperature is 600 K. The air can be modeled as an ideal gas with c 0.733 k.J/kg K and kinetic and potential energy...
6.50 m A closed, rigid tank contains 5 kg of air initially at 300 K, 1...
6.50 m A closed, rigid tank contains 5 kg of air initially at 300 K, 1 bar. As illustrated in Fig. P6.50, the tank is in contact with a thermal reservoir at 600 K and heat transfer occurs at the boundary where the temperature is 600 K. A stirring rod transfers 600 kJ of energy to the air. The final temperature is 600 K. The air can be modeled as an ideal gas with cy = 0.733 kJ/kg . K...
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A 12-ounce soft drink weighs about 0.35 kilograms. Assume that
on a hot day a can of soft drink is cooled in a container of liquid
water in equilibrium with ice. There is enough ice in the container
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and the ice-water can be considered a heat sink. Model the soft
drink with the properties of water, assuming it has an initial
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A 46 kg copper block initially at 140°C is dropped into an insulated tank that contains...
A 46 kg copper block initially at 140°C is dropped into an insulated tank that contains 90 L of water at 10°C. Determine the final equilibrium temperature and the total entropy change for this process. The specific heat of water at 25°C is Cp= 4.18 kJ/kg-K. The density of water is 997 kg/m3. The specific heat of copper at 27°C is cp=0.386 kJ/kg-K. Water Copper 90 L The final equilibrium temperature is 15.85 K. The total entropy change during this...
A rigid tank initially contains 0.32 kg steam at 4 MPa, superheated by 350°C. Now the...
A rigid tank initially contains 0.32 kg steam at 4 MPa, superheated by 350°C. Now the steam loses heat to the surroundings and the cooling of tank continues until the cylinder contains water at 90°C. Determine; (a) the final pressure and the quality (if mixture), (b) the boundary work, (c) the amount of heat transfer (d) and the total entropy generation if the Tsur=20 °C.
Problem 3 A rigid 6L-tank contains 3.3 kg of water initially at 30°C. The tank is heated to 175°C by a heat pump that receives heat from surroundings transfer to the water, (b) the change in entropy at 25°C. The process is reversible. Find (a) the heat
Problem 3 A rigid 6L-tank contains 3.3 kg of water initially at 30°C. The tank is heated to 175°C by a heat pump that receives heat from surroundings transfer to the water, (b)...
A 34 kg iron block and a 48-kg copper block, both initially at 80°C, are dropped into a large lake at 15°C. Thermal equilibrium is established after a while as a result of heat transfer between the blocks and the lake water. Determine the total entropy change for this process. The specific heat of Iron at room temperature is cp0.45 kJ/kg.K. The specific heat of copper at 27°C is ep 0,386 kJ/kg.K. Iron Lake 15°C Copper The total entropy change...
A 70-kg copper block initially at 140'C is dropped into an insulated tank that contains 90 L of water at 10'C. Determine the final equilibrium temperature and the total entropy change for this process. The specific heat of water at 25°C is cp=418 kJ/kg-K. The density of water is 997 kg/m2. The specific heat of copper at 27°C is Cp=0.386 kJ/kg.K. Water Copper 90 L The final equilibrium temperature is OK The total entropy change during this process is OKJ/K.
Required information A shell-and-tube heat exchanger is used for cooling 47 kg/s of a process stream flowing through the tubes from 160°C to 136°C. This heat exchanger has a total of 100 identical tubes. each with an inside diameter of 2.5 cm and negligible wall thickness. The average properties of the process stream are: p = 950 kg/m”, k = 0.50 W/mK, Cp=3.5 kJ/kg.K, and -20 mPas The coolant stream is water (cp=4.18 kJ/kg K) at a flow rate of...
A sealed rigid tank has 0.1 kg saturated vapor R-410a at 0°C that is cooled to 20°C by a 20°C heat sink. Thermodynamic properties of R410a at initial and final states are given as: u1 = 253.02 kJ/kg, 51 -1.0368 kJ/kg.k ; u2 - 136.5 kJ/kg; 52 - 0.5946 kJ/kg.K .. Find the heat transfer during the cooling process. b. Calculate the change in entropy of the R-410a c. Determine the change in entropy of heat sink, a. Estimate the...
6.) A closed, rigid tank contains 5 kg of air initially at 300 K, 1 bar. The diagram below shows a tank in contact with a thermal reservoir at 600 K and heat transfer occurs at the boundary where the temperature is 600 K. A stirring rod transfers 600 kJ of energy to the air. The final temperature is 600 K. The air can be modeled as an ideal gas with c 0.733 k.J/kg K and kinetic and potential energy...
6.50 m A closed, rigid tank contains 5 kg of air initially at 300 K, 1 bar. As illustrated in Fig. P6.50, the tank is in contact with a thermal reservoir at 600 K and heat transfer occurs at the boundary where the temperature is 600 K. A stirring rod transfers 600 kJ of energy to the air. The final temperature is 600 K. The air can be modeled as an ideal gas with cy = 0.733 kJ/kg . K...
A 12-ounce soft drink weighs about 0.35 kilograms. Assume that
on a hot day a can of soft drink is cooled in a container of liquid
water in equilibrium with ice. There is enough ice in the container
so that the temperature of the ice water stays constant at 0 0 C
and the ice-water can be considered a heat sink. Model the soft
drink with the properties of water, assuming it has an initial
temperature of 30 0 C...
A 46 kg copper block initially at 140°C is dropped into an insulated tank that contains 90 L of water at 10°C. Determine the final equilibrium temperature and the total entropy change for this process. The specific heat of water at 25°C is Cp= 4.18 kJ/kg-K. The density of water is 997 kg/m3. The specific heat of copper at 27°C is cp=0.386 kJ/kg-K. Water Copper 90 L The final equilibrium temperature is 15.85 K. The total entropy change during this...
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