Calculate the energy conversion efficiencies in percent of the energy conversion: A heat pump operating at...
Calculate the energy conversion efficiencies in percent of the energy conversion:
A heat pump operating at 40oF produces 600,000 Btus of output heat for each 800 cubic feet of natural gas burned.
Homework Answers
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Calculate the energy conversion efficiencies in percent of the
energy conversion:
A heat pump operating at...
Page: (Previous) 1 2 3 456 (Next) A heat pump extracts energy from groundwater at 17...
Page: (Previous) 1 2 3 456 (Next) A heat pump extracts energy from groundwater at 17 C and transfers it to water at 75 C to heat a building. The pump Marks: 1 SUpplies heat at the rate of 10 kW. Calculate the pump's hourly operating cost when burned if electricity costs 16.1 dollars/kWh. (unit: dollars)
Calculate the specific energy consumption of a pump operating at 8200 m3 /d, 10 m of...
Calculate the specific energy consumption of a pump operating at 8200 m3 /d, 10 m of head, and 85 percent efficiency.
Operating in series are two reversible heat pumps. Heat transfer gives energy to the first cycle...
Operating in series are two reversible heat pumps. Heat transfer
gives energy to the first cycle from a cold reservoir at 105 K and
rejects energy by heat transfer to a reservoir at an intermediate
temperature T greater than 105 K. The second cycle receives energy
by heat transfer from the reservoir at T and rejects energy by heat
transfer to a higher-temperature reservoir at 1200 K. If the heat
pump cycles have the same co-efficient of performance, calculate:
Low...
A reversible heat pump operating between thermal reservoirs at 15°C and 10°C consumes 240 J of...
A reversible heat pump operating between thermal reservoirs at 15°C and 10°C consumes 240 J of energy each second. How much heat energy is "pumped" into the house each second?
A heat pump operating with R-134a is used to maintain an indoor temperature of 21°C using...
A heat pump operating with R-134a is used to maintain an indoor temperature of 21°C using heat from the bottom of a lake that stays at 2°C. Assume an 80% efficient compressor. If the heat pump supplies 100 kW of energy to the building, calculate the required mass flow rate and COP for the heat pump. Calculate a few data points to plot the effect of a 10°C temperature range at the cold side on required mass flow rate and...
Use the following information to answer the questions below: Heat Power is a utility company that...
Use the following information to answer the questions below: Heat Power is a utility company that would like to predict the monthly heating bill for a household in a particular region during the month of January. A random sample of 18 households in the region were selected and their January heating bill recorded. The data is shown in the table below along with the square footage of the house (SF), the age of the heating system in years (Age), and...
Here is the energy analysis of the hydronic heating system depicted in the diagram. The boiler...
Here is the energy analysis of the hydronic heating system
depicted in the diagram.
The boiler plant consists of two identical boilers, each having
the following characteristics:
• Fuel: natural gas
• Burner Type: on/off
• Rated Output = 85 kW
• Rated Efficiency, nFL = 80%
The boilers operate in a “Lead/Lag” arrangement, i.e., Boiler 1
operates first to meet the load (up to its capacity), and Boiler 2
operates as necessary to meet any remaining load.
The pump...
5, (25 points) A Carnot heat pump is used to maintain a house at 20 °C...
5, (25 points) A Carnot heat pump is used to maintain a house at 20 °C in winter and consumes 8 kW of power (electricity) when operating. On a day temperature outside the house is -3 °C, the house is estimated to lose heat at an average rate of 80,000 kJ/h. (Sa). (2p) Please identify the hot reservoir and the cool reservoir of this heat pump. (5b). (2p) Please draw of schematic diagram of this heat pump-house heating system with...
It is found that 40 kJ.s- of heat energy is lost from a building when the...
It is found that 40 kJ.s- of heat energy is lost from a building when the internal air temperature is maintained at 22°C and the outside air temperature is 6°C. (a) What is the overall rate of entropy generation? (b) To match this heat loss a heat pump is to be employed which extracts heat from an outside, under-ground heat source. Sketch the heat-pump system diagrammatically and show the heat pump cycle on a sketch of the pressure-enthalpy diagram relating...
Q1 a) Company A designed a heat pump to supply heat into a library in Canada during...
Q1
a) Company A designed a heat pump to
supply heat into a library in Canada during
winter, so that the library can maintain to be at 20°C. The heat
pump utilizes
12,000 L/min of Refrigerant-134a as the working fluid and absorb
heat from an
industrial water stream. The water stream enters the evaporator at
50°C and exits
at 25°C. The refrigerant enters the evaporator at 10°C with 90%
moisture content
and leaves at 20°C. There is no pressure drop in...
Page: (Previous) 1 2 3 456 (Next) A heat pump extracts energy from groundwater at 17 C and transfers it to water at 75 C to heat a building. The pump Marks: 1 SUpplies heat at the rate of 10 kW. Calculate the pump's hourly operating cost when burned if electricity costs 16.1 dollars/kWh. (unit: dollars)
Operating in series are two reversible heat pumps. Heat transfer
gives energy to the first cycle from a cold reservoir at 105 K and
rejects energy by heat transfer to a reservoir at an intermediate
temperature T greater than 105 K. The second cycle receives energy
by heat transfer from the reservoir at T and rejects energy by heat
transfer to a higher-temperature reservoir at 1200 K. If the heat
pump cycles have the same co-efficient of performance, calculate:
Low...
Use the following information to answer the questions below: Heat Power is a utility company that would like to predict the monthly heating bill for a household in a particular region during the month of January. A random sample of 18 households in the region were selected and their January heating bill recorded. The data is shown in the table below along with the square footage of the house (SF), the age of the heating system in years (Age), and...
Here is the energy analysis of the hydronic heating system
depicted in the diagram.
The boiler plant consists of two identical boilers, each having
the following characteristics:
• Fuel: natural gas
• Burner Type: on/off
• Rated Output = 85 kW
• Rated Efficiency, nFL = 80%
The boilers operate in a “Lead/Lag” arrangement, i.e., Boiler 1
operates first to meet the load (up to its capacity), and Boiler 2
operates as necessary to meet any remaining load.
The pump...
5, (25 points) A Carnot heat pump is used to maintain a house at 20 °C in winter and consumes 8 kW of power (electricity) when operating. On a day temperature outside the house is -3 °C, the house is estimated to lose heat at an average rate of 80,000 kJ/h. (Sa). (2p) Please identify the hot reservoir and the cool reservoir of this heat pump. (5b). (2p) Please draw of schematic diagram of this heat pump-house heating system with...
It is found that 40 kJ.s- of heat energy is lost from a building when the internal air temperature is maintained at 22°C and the outside air temperature is 6°C. (a) What is the overall rate of entropy generation? (b) To match this heat loss a heat pump is to be employed which extracts heat from an outside, under-ground heat source. Sketch the heat-pump system diagrammatically and show the heat pump cycle on a sketch of the pressure-enthalpy diagram relating...
Q1
a) Company A designed a heat pump to
supply heat into a library in Canada during
winter, so that the library can maintain to be at 20°C. The heat
pump utilizes
12,000 L/min of Refrigerant-134a as the working fluid and absorb
heat from an
industrial water stream. The water stream enters the evaporator at
50°C and exits
at 25°C. The refrigerant enters the evaporator at 10°C with 90%
moisture content
and leaves at 20°C. There is no pressure drop in...
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