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Problem 2.069 SI A window-mounted room air conditioner removes energy by heat transfer from a room...
Problem 4.040 SI Refrigerant 134a enters an air conditioner compressor at 4 bar, 20°C, and is...
Problem 4.040 SI Refrigerant 134a enters an air conditioner compressor at 4 bar, 20°C, and is compressed at steady state to 12 bar, 80°C. The volumetric flow rate of the refrigerant entering is 8.5 m3/min. The work input to the compressor is 127.5 kJ per kg of refrigerant flowing Neglecting kinetic and potential energy effects, determine the magnitude of the heat transfer rate from the compressor, in kw kW the tolerance is +/-596 Click if you would like to Show...
An air conditioner removes hot air at 35 °C and 70 % relative humidity from the...
An air conditioner removes hot air at 35 °C and 70 % relative humidity from the atmosphere and delivers cool air at 20 °C and a constant pressure of 1 atm. A. Using the psychrometric chart, determine the fraction of water that condenses from the humid air. B. Determine the rate at which heat must be removed from the system in order to deliver 20m3/min of humid air to a home.
Consider a condenser for a room air conditioner that uses R-22 as the refrigerant. This heat...
Consider a condenser for a room air conditioner that uses R-22 as the refrigerant. This heat exchanger has total internal (refrigerant side) and external (air side) surface areas of 0.49 m2 and 10.33 m2 , respectively. Using a "lumped" analysis and neglecting refrigerant pressure drop, determine the heat transfer rate from the condenser and the exit air and refrigerant conditions for the following design conditions: a.) volumetric air flow of 0.50 m3 /s, b.) inlet air temperature of 30 C,...
Problem 5.040 SI At steady state, a refrigeration cycle operating between hot and cold reservoirs at...
Problem 5.040 SI At steady state, a refrigeration cycle operating between hot and cold reservoirs at 300 K and 275 K, respectively, removes energy by heat transfer from the cold reservoir at a rate of 100 kw. (a) If the cycle's coefficient of performance is 4, determine the power input required, in kW. (b) Determine the minimum theoretical power required, in kW, for any such cycle.
A concentrating solar collector system, as below, provides energy by heat transfer to a power cycle...
A concentrating solar collector system, as below, provides
energy by heat transfer to a power cycle at a rate of 2 MW. The
cycle thermal efficiency is 36%. Determine the power developed by
the cycle, in MW. What is the work output, in MW*h, for 4380 hours
of steady-state operation? If the work is valued at $0.08/kW-h,
what is the total dollar value of the work output?
A heat pump cycle whose coefficient of performance is 2.5 delivers energy by heat transfer to a dwelling at a rate of 20 kW.
Problem 2) A heat pump cycle whose coefficient of performance is 2.5 delivers energy by heat transfer to a dwelling at a rate of 20 kW. (a) Determine the net power required to operate the heat pump, in kW. (b) Evaluating electricity at $0.08 per determine the cost of electricity in a month when the heat pump operates for 200 hours. Problem 3) A power cycle receives energy by heat transfer from the combustion of fuel at a rate of 300 MW. The thermal efficiency...
US PRINTER VERSİON "ACKIC I Problem 5.044 SI A heat pump cycle is used to maintain...
US PRINTER VERSİON "ACKIC I Problem 5.044 SI A heat pump cycle is used to maintain the intenior of a building at 20°C. At steady state, the heat pump receives energy by 9eC and discharges energy by heat transfer to the building at a rate of 120,000 k/h. Over a period of 14 days, an electric meter records that 2000 kw-h of electricity is provided to the heat pump. Determine: (a) the amount of eneroy that the heat pump receives...
Problem 4.018 SI Air enters a horizontal, constant-diameter heating duct operating at steady state at 290...
Problem 4.018 SI Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 K, 1 bar, with a volumetric flow rate of 0.25 m3/s, and exits at 325 K, 0.95 bar. The flow area is 0.06 m2 Assuming the ideal gas model with k 1.4 for the air, determine: (a) the mass flow rate, in kg/s, (b) the velocity at the inlet and exit, each in m/s, and (c) the rate of heat transfer to the air,...
Problem 4.070 SI The figure below shows a turbine-driven pump that provides water to a mixing...
Problem 4.070 SI The figure below shows a turbine-driven pump that provides water to a mixing chamber located dz 5 m higher than the pump, where -20 kg/s. Steady-state operating data for the turbine and pump are labeled on the figure. Heat transfer from the water to its surroundings occurs at a rate of 2 kW. For the turbine, heat transfer with the surroundings and potential energy effects are negligible. Kinetic energy effects at all numbered states can be ignored....
Air as an ideal gas flows through the turbine and heat exchanger arrangement shown in figure s...
Air as an ideal gas flows through the turbine and heat exchanger arrangement shown in figure shown below. Steady-state data are given on the figure. Stray heat transfer and kinetic and potential energy effects can be ignored. Determine (a) temperature T3, in K. (b) the power output of the second turbine, in kW. (c) the rates of entropy production, each in kW/K, for the turbines and heat exchanger. (d) Using the result of part (c), place the components in rank...
Problem 4.040 SI Refrigerant 134a enters an air conditioner compressor at 4 bar, 20°C, and is compressed at steady state to 12 bar, 80°C. The volumetric flow rate of the refrigerant entering is 8.5 m3/min. The work input to the compressor is 127.5 kJ per kg of refrigerant flowing Neglecting kinetic and potential energy effects, determine the magnitude of the heat transfer rate from the compressor, in kw kW the tolerance is +/-596 Click if you would like to Show...
Consider a condenser for a room air conditioner that uses R-22 as the refrigerant. This heat exchanger has total internal (refrigerant side) and external (air side) surface areas of 0.49 m2 and 10.33 m2 , respectively. Using a "lumped" analysis and neglecting refrigerant pressure drop, determine the heat transfer rate from the condenser and the exit air and refrigerant conditions for the following design conditions: a.) volumetric air flow of 0.50 m3 /s, b.) inlet air temperature of 30 C,...
Problem 5.040 SI At steady state, a refrigeration cycle operating between hot and cold reservoirs at 300 K and 275 K, respectively, removes energy by heat transfer from the cold reservoir at a rate of 100 kw. (a) If the cycle's coefficient of performance is 4, determine the power input required, in kW. (b) Determine the minimum theoretical power required, in kW, for any such cycle.
A concentrating solar collector system, as below, provides
energy by heat transfer to a power cycle at a rate of 2 MW. The
cycle thermal efficiency is 36%. Determine the power developed by
the cycle, in MW. What is the work output, in MW*h, for 4380 hours
of steady-state operation? If the work is valued at $0.08/kW-h,
what is the total dollar value of the work output?
US PRINTER VERSİON "ACKIC I Problem 5.044 SI A heat pump cycle is used to maintain the intenior of a building at 20°C. At steady state, the heat pump receives energy by 9eC and discharges energy by heat transfer to the building at a rate of 120,000 k/h. Over a period of 14 days, an electric meter records that 2000 kw-h of electricity is provided to the heat pump. Determine: (a) the amount of eneroy that the heat pump receives...
Problem 4.018 SI Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 K, 1 bar, with a volumetric flow rate of 0.25 m3/s, and exits at 325 K, 0.95 bar. The flow area is 0.06 m2 Assuming the ideal gas model with k 1.4 for the air, determine: (a) the mass flow rate, in kg/s, (b) the velocity at the inlet and exit, each in m/s, and (c) the rate of heat transfer to the air,...
Problem 4.070 SI The figure below shows a turbine-driven pump that provides water to a mixing chamber located dz 5 m higher than the pump, where -20 kg/s. Steady-state operating data for the turbine and pump are labeled on the figure. Heat transfer from the water to its surroundings occurs at a rate of 2 kW. For the turbine, heat transfer with the surroundings and potential energy effects are negligible. Kinetic energy effects at all numbered states can be ignored....
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