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1. (10) A refrigerator at home requires an electric power of 200W to operate. Temperature in...
Problem 3 A home in a Midwestern city is being heated with a heat pump in...
Problem 3 A home in a Midwestern city is being heated with a heat pump in a winter day where the outside temperature is 5 C. Due to poor insulation, the home loses 800 KW of heat to the outside surroundings. An space heater inside the room generates 150 KW and another 120 KW of heat is generated by all the appliances and people in the room. The home is desired to be maintained at 25°C The heat pump consumes...
The interior of a refrigerator has a surface area of 4.7 m2 . It is insulated...
The interior of a refrigerator has a surface area of 4.7 m2 . It is insulated by a 2.9 cm thick material that has a thermal conductivity of 0.024 J/m · s · ◦ C. The ratio of the heat extracted from the interior to the work done by the motor is 6.7% of the theoretical maximum. The temperature of the room is 20.1 ◦C, and the temperature inside the refrigerator is 9.1 ◦C. Determine the power required to run...
#10: A heat pump requires 430 W of electrical power to deliver heat to your house...
#10: A heat pump requires 430 W of electrical power to deliver heat to your house at a rate of 2390 J per second. How many joules of energy are extracted from the cold air outside each second? #11: The coefficient of performance for a heat pump is defined as the ratio of the heat delivered to the warmer system to the work required. If a heat pump requires an input of 360 W of electrical energy and has a...
1. Calculate (a) the maximum performance factor of a refrigerator between an inside temperature of -10°C and outsid...
1. Calculate (a) the maximum performance factor of a refrigerator between an inside temperature of -10°C and outside at STP and (b) the minimum amount of work to remove 100 of heat from inside the refrigerator
2. A heat pump is operated to maintain a home at 25 °C when the outside temperature is only -5 °C...
2. A heat pump is operated to maintain a home at 25 °C when the outside temperature is only -5 °C. (a) If the house requires 50 kW heat, what is the power required for the heat pump? Assume the heat pump to be a Carnot heat pump (b) If an electric heater was used for this purpose instead, assuming an electric current of 5A, what would be the required resistance of the heater? (c) If electricity costs 10 cents...
2-26. The motor in a refrigerator has a power output of 200 W. If the freezing...
2-26. The motor in a refrigerator has a power output of 200 W. If the freezing compartment is at 270 K and the outside air is at 300 K, assuming ideal efficiency, what is the maximum amount of heat that can be extracted from the freezing compartment in 10 min? 2-32. Four moles of an ideal gas are caused to expand from a volume VI to a volume V2 2V1. (a) If the expansion is isothermal at the temperature T-400...
.85-120 Thermodynamics Tutorial 3 Problem 1. An inventor claims to have invented 4 engines, each of...
.85-120 Thermodynamics Tutorial 3 Problem 1. An inventor claims to have invented 4 engines, each of which operates between constant-temperature reservoirs of 400 and 300 K. Consider the 1st and 2nd laws of thermodynamics to evaluate the engines. For each engine, state and explain why it does or doesn't violate the 1st and 2nd Laws of Thermo. 1st law hint: Think quantity of work. 2nd Law hint: Think process efficiency. Engine 1 2 3 4 QH (J) 200 500 600...
earning Goal: To understand that a heat engine run backward is a heat pump that can be used as a refrigerator....
earning Goal: To understand that a heat engine run backward is a heat pump that can be used as a refrigerator. By now you should be familiar with heat engines--devices, theoretical or actual, designed to convert heat into work. You should understand the following: Heat engines must be cyclical; that is, they must return to their original state some time after having absorbed some heat and done some work). Heat engines cannot convert heat into work without generating some waste...
Goal Solve for the performance coefficient of a refrigerator using a five- step process the includes:...
Goal Solve for the performance coefficient of a refrigerator using a five- step process the includes: 1. Making a state table. 2. Making a process table. 3. Calculating the totals for Work, Heat, and Internal-Energy-Change. 4. Identifying the heat input (cold reservoir) and output (hot reservoir). 5. Calculating the performance coefficient of the refrigerator. isothermal Problem Shown in the figure to the right is a cyclic process undergone by a refrigerator. Your refrigerator shall use 8.0 moles of helium gas...
6. An office building requires a heat transfer rate of 20 kW to maintain the inside temperature a...
6. An office building requires a heat transfer rate of 20 kW to maintain the inside temperature at 21°C when the outside temperature is 0°C. A vapor-compression heat pump with Refrigerant 134a as the working fluid is to be used to provide the necessary heating. The compressor operates adiabatically with an isentropic efficiency of 82%. Specify appropriate evaporator and condenser pressures of a cycle for this purpose assuming Δ1cond-Al evap-10°C, as shown below. The states are numbered as shown below....
Problem 3 A home in a Midwestern city is being heated with a heat pump in a winter day where the outside temperature is 5 C. Due to poor insulation, the home loses 800 KW of heat to the outside surroundings. An space heater inside the room generates 150 KW and another 120 KW of heat is generated by all the appliances and people in the room. The home is desired to be maintained at 25°C The heat pump consumes...
1. Calculate (a) the maximum performance factor of a refrigerator between an inside temperature of -10°C and outside at STP and (b) the minimum amount of work to remove 100 of heat from inside the refrigerator
2. A heat pump is operated to maintain a home at 25 °C when the outside temperature is only -5 °C. (a) If the house requires 50 kW heat, what is the power required for the heat pump? Assume the heat pump to be a Carnot heat pump (b) If an electric heater was used for this purpose instead, assuming an electric current of 5A, what would be the required resistance of the heater? (c) If electricity costs 10 cents...
2-26. The motor in a refrigerator has a power output of 200 W. If the freezing compartment is at 270 K and the outside air is at 300 K, assuming ideal efficiency, what is the maximum amount of heat that can be extracted from the freezing compartment in 10 min? 2-32. Four moles of an ideal gas are caused to expand from a volume VI to a volume V2 2V1. (a) If the expansion is isothermal at the temperature T-400...
.85-120 Thermodynamics Tutorial 3 Problem 1. An inventor claims to have invented 4 engines, each of which operates between constant-temperature reservoirs of 400 and 300 K. Consider the 1st and 2nd laws of thermodynamics to evaluate the engines. For each engine, state and explain why it does or doesn't violate the 1st and 2nd Laws of Thermo. 1st law hint: Think quantity of work. 2nd Law hint: Think process efficiency. Engine 1 2 3 4 QH (J) 200 500 600...
Goal Solve for the performance coefficient of a refrigerator using a five- step process the includes: 1. Making a state table. 2. Making a process table. 3. Calculating the totals for Work, Heat, and Internal-Energy-Change. 4. Identifying the heat input (cold reservoir) and output (hot reservoir). 5. Calculating the performance coefficient of the refrigerator. isothermal Problem Shown in the figure to the right is a cyclic process undergone by a refrigerator. Your refrigerator shall use 8.0 moles of helium gas...
6. An office building requires a heat transfer rate of 20 kW to maintain the inside temperature at 21°C when the outside temperature is 0°C. A vapor-compression heat pump with Refrigerant 134a as the working fluid is to be used to provide the necessary heating. The compressor operates adiabatically with an isentropic efficiency of 82%. Specify appropriate evaporator and condenser pressures of a cycle for this purpose assuming Δ1cond-Al evap-10°C, as shown below. The states are numbered as shown below....
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