The inside of an ice machine is -8 °C and the outside temperature is 29 °C....
The inside of an ice machine is -8 °C and the outside temperature is 29 °C. The initial temperature of the water is 21 °C, and the coefficient of performance is 28% of the ideal. Electrical energy costs $0.11 /kW-hr. The specific heat of ice is 0.5cal/g-°C.
| A. | What is the cost ($) of electricity to make 3 five pound bags of ice? |
| B. | If the motor that drives the compressor consumes 920 W of electricity, how long does it take to make 3 bags of ice? |
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The inside of an ice machine is -8 °C and the outside
temperature is 29 °C....
Civil and Environmental Engineering department is considering the purchase of an ice machine. Samantha Allen, business...
Civil and Environmental Engineering department is considering
the purchase of an ice machine. Samantha Allen, business manager
extraordinaire, wants help in evalulating the purchase. She knows
that the inside of the machine is -13 °C and the outside
temperature is 30 °C, The initial temperature of the water is 22
°C, and the coefficient of performance is 31% of the ideal.
Electrical energy costs $0.13 /kW-hr. The specific heat of ice is
0.5cal/g-°C.
What is the cost ($) of electricity...
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An ideal vapor-compression heat pump cycle using R-134a is used to heat a house. The inside temperature is 22 ℃; the outside temperature is 0 ℃ Saturated vapor at 2.2 bar enters the compressor, and saturated liquid leaves the condenser at 3 ba. The mass ow rate is 0.2 kg/s. Detemine: a the power iput to the compressor (in kw) b. the coefficient of performance c. the coefficient of performance if the system were used as a refrigeration cycle d....
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We = in (haahi) Qinani Chahu) ME 3210 Thermodynamics I Quiz 8 Summer 2020 Name: 1....
We = in (haahi) Qinani Chahu) ME 3210 Thermodynamics I Quiz 8 Summer 2020 Name: 1. R134a in an ideal vapor compression heat pump generates 35 kW to heat a room. A mixture of 95% quality enters the compressor at 0.6 bar and saturated liquid exits the condenser at 14 bar. Determine: a) Mass flow rate (kg/hr) th Compressor power (kJ/min) c) Heat transferred from outside (kW) d) Coefficient of performance
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Civil and Environmental Engineering department is considering
the purchase of an ice machine. Samantha Allen, business manager
extraordinaire, wants help in evalulating the purchase. She knows
that the inside of the machine is -13 °C and the outside
temperature is 30 °C, The initial temperature of the water is 22
°C, and the coefficient of performance is 31% of the ideal.
Electrical energy costs $0.13 /kW-hr. The specific heat of ice is
0.5cal/g-°C.
What is the cost ($) of electricity...
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....
An ideal vapor-compression heat pump cycle using R-134a is used to heat a house. The inside temperature is 22 ℃; the outside temperature is 0 ℃ Saturated vapor at 2.2 bar enters the compressor, and saturated liquid leaves the condenser at 3 ba. The mass ow rate is 0.2 kg/s. Detemine: a the power iput to the compressor (in kw) b. the coefficient of performance c. the coefficient of performance if the system were used as a refrigeration cycle d....
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...
5.75 A heating system must maintain the interior of a building at TH = 20 degree C when the outside temperature is T = 2 degree C. If the rate of heat transfer from the building through its walls and roof is 16.4 kW, determine the electrical power required, in kW, to heat the building using (a) electrical-resistance heating, (b) a heat pump whose coefficient of performance is 3.0, (c) a reversible heat pump operating between hot and cold reservoirs...
We = in (haahi) Qinani Chahu) ME 3210 Thermodynamics I Quiz 8 Summer 2020 Name: 1. R134a in an ideal vapor compression heat pump generates 35 kW to heat a room. A mixture of 95% quality enters the compressor at 0.6 bar and saturated liquid exits the condenser at 14 bar. Determine: a) Mass flow rate (kg/hr) th Compressor power (kJ/min) c) Heat transferred from outside (kW) d) Coefficient of performance
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