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13) Suppose that the heat flow out of your 20°C home in the winter is 7...
A heat pump is to be used to heat a house in winter and then reversed...
A heat pump is to be used to heat a house in winter and then
reversed to cool the house in summer. The interior space is to be
maintained at 20oC. Heat transfer through walls and roof is
estimated to be χ = 0.525 kJ/sec per degree difference in
temperature between inside and outside. (6a) (8p) In winter if the
outside temperature is 5oC, what is the minimum power required to
drive the heat pump? (6b) (12p) For the same...
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...
On a cold winter day, the outside temperature is -20°C and the inside temperature is maintained...
On a cold winter day, the outside temperature is -20°C and the inside temperature is maintained at 20°C. There is a net heat flow to the outside through the walls, roof, etc., of 25 kW. What is the rate of increase of the entropy of the universe as a result of this heat flow?
On a cold winter day where the outside temperature is -10o C, a heat pump provides...
On a cold winter day where the outside temperature is -10o C, a heat pump provides 20 kW to heat a house to 20o C. The heat pump has a COPHP of 4 at the maximum power. The next day a storm brings the outside temperature down to −15o C. If the ratio of COPHP and the reversible COPrev for day 1 and day 2 is the same, COPHP for both days is the same, and that the house loses...
We propose to heat a house in the winter with a heat pump. The house is...
We propose to heat a house in the winter with a heat pump. The house is to be maintained at 20°C at all times. When the ambient temperature outside drops to -10°C, the rate at which heat is lost from the house is estimated to be 25 kW. What is the minimum electrical power (in kW) required to drive the heat pump? Use the correct sign convention to indicate the direction of work. Hint: the minimum power happens with the...
Anyone can help me with this question? 2 - Heat pump .The heat pump illustrated beside...
Anyone can help me with this question?
2 - Heat pump .The heat pump illustrated beside uses 1.5 kw mechanical power (that's is 1500 J/s) and extracts 1.2 million calories per hour from the outside air . A) How much heat is pumped into the house every day? .B) If this heat pump is made such that it is ideal and reversible, and you decide to heat your house with a gas furnace and use the heat pump as an...
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...
Assume that you heat your home with a heat pump whose heat exchanger is at Tc=2∘C, and which maintains the baseboard r...
Assume that you heat your home with a heat pump whose heat exchanger is at Tc=2∘C, and which maintains the baseboard radiators at Th=47∘C. If it would cost $1000 to heat the house for one winter with ideal electric heaters (which have a coefficient of performance of 1), how much would it cost if the actual coefficient of performance of the heat pump were 75% of that allowed by thermodynamics? Express the cost in dollars.
The heat pump illustrated beside uses 1.5 kW mechanical power (that's is 1500 J/s) and extracts...
The heat pump illustrated beside uses 1.5 kW mechanical power
(that's is 1500 J/s) and extracts 1.2 million calories per hour
from the outside air.
• A) How much heat is pumped into the house every day?
• B) If this heat pump is made such that it is ideal and
reversible, and you decide to heat your house with a gas furnace
and use the heat pump as an heat engine to produce mechanical work,
then what would be...
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....
A heat pump is to be used to heat a house in winter and then
reversed to cool the house in summer. The interior space is to be
maintained at 20oC. Heat transfer through walls and roof is
estimated to be χ = 0.525 kJ/sec per degree difference in
temperature between inside and outside. (6a) (8p) In winter if the
outside temperature is 5oC, what is the minimum power required to
drive the heat pump? (6b) (12p) For the same...
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...
We propose to heat a house in the winter with a heat pump. The house is to be maintained at 20°C at all times. When the ambient temperature outside drops to -10°C, the rate at which heat is lost from the house is estimated to be 25 kW. What is the minimum electrical power (in kW) required to drive the heat pump? Use the correct sign convention to indicate the direction of work. Hint: the minimum power happens with the...
Anyone can help me with this question?
2 - Heat pump .The heat pump illustrated beside uses 1.5 kw mechanical power (that's is 1500 J/s) and extracts 1.2 million calories per hour from the outside air . A) How much heat is pumped into the house every day? .B) If this heat pump is made such that it is ideal and reversible, and you decide to heat your house with a gas furnace and use the heat pump as an...
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...
The heat pump illustrated beside uses 1.5 kW mechanical power
(that's is 1500 J/s) and extracts 1.2 million calories per hour
from the outside air.
• A) How much heat is pumped into the house every day?
• B) If this heat pump is made such that it is ideal and
reversible, and you decide to heat your house with a gas furnace
and use the heat pump as an heat engine to produce mechanical work,
then what would be...
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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A...
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During laser vision correction, a brief burst of 193 nm
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