A refrigeration system removes energy from a 65.8 deg F container and dumps it into 92.7...
A refrigeration system removes energy from a 65.8 deg F container and dumps it into 92.7 deg F room air.
What is the Coefficient of Performance for this system?
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A refrigeration system removes energy from a 65.8 deg F
container and dumps it into 92.7...
Problem 2.069 SI A window-mounted room air conditioner removes energy by heat transfer from a room...
Problem 2.069 SI A window-mounted room air conditioner removes energy by heat transfer from a room and rejects energy by heat transfer to the outside air. For steady-state operation, the air conditioner cycle requires a power input of 0.7 kW and has a coefficient of performance of 5.5. Determine the rate that energy is removed from the room air, in kw. If electricity is valued at $0.1/kW·h, determine the cost of operation for 24 hours of operation. ▼ Part A...
A Refrigeration System Using R-134A In a refrigeration system, the refrigerant R-134A begins as s...
A Refrigeration System Using R-134A In a refrigeration system, the refrigerant R-134A begins as saturated vapor at -15°(State 1). It then goes through a reversible adiabatic compressor to reach State 2. After flowing through the condenser (a heat exchanger), the refrigerant exits as saturated liquid at 70°C (State 3). It is then throttled by going through an expansion valve, to reach State 4. It finishes the cycle by going through another heat exchanger (the evaporator), to return to State 1....
2- In vapour compression refrigeration system, compressor is used because a. It increases cooling effect of...
2- In vapour compression refrigeration system, compressor is used because a. It increases cooling effect of cycle b. It makes possible, to remove heat from refrigerant at atmospheric pressure c. It increases the coefficient of performance of the system d. It removes thermal properties of refrigerant 3- The area under pressure volume curve of any thermodynamic process represents a. heat rejected only b. heat absorbed only c. heat absorbed and rejected d. work done 4. What is the correct formula...
4. Refrigeration and air conditioning is quite useful, but it is, in effect, a way to move heat f...
4. Refrigeration and air conditioning is quite useful, but it is, in effect, a way to move heat from a low temperature to a high temperature. Is this possible, given the second law? Answer the following questions below, for R-134a (a common refrigerant), and then state whether you believe refrigeration violates the second law, and why (or why not) a. R-134a arrives to the inside of the refrigerator that you are trying to keep cooled to T- 4°C. The air...
4. The following test data were obtained from a R134A vapour-compression refrigeration system Condenser pressure Evaporator...
4. The following test data were obtained from a R134A vapour-compression refrigeration system Condenser pressure Evaporator pressure Temperature at compressor inlet Temperature at compressor outlet Temperature at condenser inlet Temperature at condenser outlet Temperature at expansion valve inlet 30 Temperature at evaporator outlet 0.9 MPa 0.6 MPa 30 C 120 C 110 C 25 C 20 °C During compression, 3.5 kJ/kg was transferred from the fluid. Determine the coefficient of performance and perform an energy balance on the system
A 20-ton industrial refrigeration system is used to maintain a freezer room at 20oF. The system...
A 20-ton industrial refrigeration system is used to maintain a freezer room at 20oF. The system uses R-22 refrigerant with evaporating temperature of 10oF and a condensing temperature of 100oF. The refrigerant enters the compressor at 20oF and exits the condenser at 85oF. Sketch the cycle on a p-h diagram and determine: a) The Carnot COP b) The compressor suction and discharge pressures in psig c) The refrigerant mass flow rate, lbs./h d) The specific volume of the refrigerant at...
I Review Part A A Carnot freezer that runs on electricity removes heat from the freezer...
I Review Part A A Carnot freezer that runs on electricity removes heat from the freezer compartment, which is at -10°C and expels it into the room at 25°C. You put an ice-cube tray containing 425 g of water at 12 Cinto the freezer. What is the coefficient of performance of this freezer? 90 AXPO 2 ? K- Submit Request Answer Part B How much energy is needed to freeze this water? Assume at the end of the process all...
A refrigeration system with a flash chamber operates with R134a between the pressure limits of 1.0 and 0.1 MPa. Th...
A refrigeration system with a flash chamber operates with R134a between the pressure limits of 1.0 and 0.1 MPa. The refrigerant leaves the condenser as saturated liquid and is throttled to a flash chamber operating at 0.5 MPa. The refrigerant leaving the low-pressure compressor at 0.5 MPa is also routed to the flash chamber. The vapor in the flash chamber is then compressed to the condenser pressure by the high-pressure compressor, and the liquidis throttled to the evaporator pressure. Assume...
m Rev A Carnot freezer that runs on electricity removes heat from the freezer compartment, which...
m Rev A Carnot freezer that runs on electricity removes heat from the freezer compartment, which is at -10°C and expels it into the room at 25°C. You put an ice-cube tray containing 425 g of water at 12 C into the freezer. Part A What is the coefficient of performance of this freezer? AZOO ? K = Submit Request Answer Part B How much energy is needed to freeze this water? Assume at the end of the process all...
4. A refrigeration unit operates in an inverted Carnot cycle. It receives from the surroundings (at...
4. A refrigeration unit operates in an inverted Carnot cycle. It receives from the surroundings (at 27°C) 10,000 kcal per hour. If the temperature inside the unit must be kept at -50°C, what is the power of the unit's engine (recall that power is P = W/t)? A Carnot engine is an idealized, reversible engine. In real life, it is found that you need to use an engine capable of producing 5.50 kW to run this unit. Express the efficiency...
Problem 2.069 SI A window-mounted room air conditioner removes energy by heat transfer from a room and rejects energy by heat transfer to the outside air. For steady-state operation, the air conditioner cycle requires a power input of 0.7 kW and has a coefficient of performance of 5.5. Determine the rate that energy is removed from the room air, in kw. If electricity is valued at $0.1/kW·h, determine the cost of operation for 24 hours of operation. ▼ Part A...
A Refrigeration System Using R-134A In a refrigeration system, the refrigerant R-134A begins as saturated vapor at -15°(State 1). It then goes through a reversible adiabatic compressor to reach State 2. After flowing through the condenser (a heat exchanger), the refrigerant exits as saturated liquid at 70°C (State 3). It is then throttled by going through an expansion valve, to reach State 4. It finishes the cycle by going through another heat exchanger (the evaporator), to return to State 1....
2- In vapour compression refrigeration system, compressor is used because a. It increases cooling effect of cycle b. It makes possible, to remove heat from refrigerant at atmospheric pressure c. It increases the coefficient of performance of the system d. It removes thermal properties of refrigerant 3- The area under pressure volume curve of any thermodynamic process represents a. heat rejected only b. heat absorbed only c. heat absorbed and rejected d. work done 4. What is the correct formula...
4. Refrigeration and air conditioning is quite useful, but it is, in effect, a way to move heat from a low temperature to a high temperature. Is this possible, given the second law? Answer the following questions below, for R-134a (a common refrigerant), and then state whether you believe refrigeration violates the second law, and why (or why not) a. R-134a arrives to the inside of the refrigerator that you are trying to keep cooled to T- 4°C. The air...
4. The following test data were obtained from a R134A vapour-compression refrigeration system Condenser pressure Evaporator pressure Temperature at compressor inlet Temperature at compressor outlet Temperature at condenser inlet Temperature at condenser outlet Temperature at expansion valve inlet 30 Temperature at evaporator outlet 0.9 MPa 0.6 MPa 30 C 120 C 110 C 25 C 20 °C During compression, 3.5 kJ/kg was transferred from the fluid. Determine the coefficient of performance and perform an energy balance on the system
I Review Part A A Carnot freezer that runs on electricity removes heat from the freezer compartment, which is at -10°C and expels it into the room at 25°C. You put an ice-cube tray containing 425 g of water at 12 Cinto the freezer. What is the coefficient of performance of this freezer? 90 AXPO 2 ? K- Submit Request Answer Part B How much energy is needed to freeze this water? Assume at the end of the process all...
A refrigeration system with a flash chamber operates with R134a between the pressure limits of 1.0 and 0.1 MPa. The refrigerant leaves the condenser as saturated liquid and is throttled to a flash chamber operating at 0.5 MPa. The refrigerant leaving the low-pressure compressor at 0.5 MPa is also routed to the flash chamber. The vapor in the flash chamber is then compressed to the condenser pressure by the high-pressure compressor, and the liquidis throttled to the evaporator pressure. Assume...
m Rev A Carnot freezer that runs on electricity removes heat from the freezer compartment, which is at -10°C and expels it into the room at 25°C. You put an ice-cube tray containing 425 g of water at 12 C into the freezer. Part A What is the coefficient of performance of this freezer? AZOO ? K = Submit Request Answer Part B How much energy is needed to freeze this water? Assume at the end of the process all...
4. A refrigeration unit operates in an inverted Carnot cycle. It receives from the surroundings (at 27°C) 10,000 kcal per hour. If the temperature inside the unit must be kept at -50°C, what is the power of the unit's engine (recall that power is P = W/t)? A Carnot engine is an idealized, reversible engine. In real life, it is found that you need to use an engine capable of producing 5.50 kW to run this unit. Express the efficiency...
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