An air cooled automotive condenser is to transfer 5 kW to an air flow with velocity...
An air cooled automotive condenser is to transfer 5 kW to an air flow with velocity of 10 m/s entering at 30 oC and leaving at 34 oC. The heat transfer coefficient of R-134a is 400 W/m2 k. The tubes are copper and are 15mm I.D. and 17mm O.D. The evaporating temperature is 5 oC, and the condensing temperature is 40 oC. What is the required airside area? Kcopper= 390 W/m. k
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An air cooled automotive condenser is to transfer 5 kW to an air
flow with velocity...
Problem 7.075 An air-cooled steam condenser is operated with air in cross flow over a square,...
Problem 7.075 An air-cooled steam condenser is operated with air in cross flow over a square, in-line array of 400 tubes (NL = NT = 20), with an outside tube diameter of 20 mm and longitudinal and transverse pitches of SL = 60 mm and ST-42 mm, respectively. Saturated steam at a pressure of 2.455 bars enters the tubes, and a uniform tube outer surface temperature of Ts - 390 K may be assumed to be maintained as condensation occurs...
please show work thank you An air-cooled steam condenser is operated with air in cross flow...
please show work thank you
An air-cooled steam condenser is operated with air in cross flow over a square, in-line array of 400 tubes (NL=NT-20), with an outside tube diameter of 20 mm and longitudinal and transverse pitches of SL-60 mm and ST = 63 mm, respectively. Saturated steam at a pressure of 2.455 bars enters the tubes, and a uniform tube outer surface temperature of Ts=390 K may be assumed to be maintained as condensation occurs within the tubes....
Problem 7.075 An air-cooled steam condenser is operated with air in cross flow over a square, in-...
Problem 7.075 An air-cooled steam condenser is operated with air in cross flow over a square, in-line array of 400 tubes (N N-20), with an outside tube diameter of 20 mm and longitudinal and transverse pitches of s 60 mm and sr 84 mm, respectively. Saturated steam at a pressure of 2.455 bars enters the tubes, and a uniform tube outer surface temperature of T,-390 K may be assumed to be maintained as condensation occurs tudy ithin the tubes. (a)...
5. Refrigerant-134a at 700kPa, 70°C, and 8 kg/min is cooled by air in a condenser until...
5. Refrigerant-134a at 700kPa, 70°C, and 8 kg/min is cooled by air in a condenser until it exits as a saturated liquid at the same pressure. The cooling air enters the condenser at 1MPa and 10°C and leaves at 17°C at the same pressure. Determine: a) Considering only the Refrigerant as a system, the heat transfer rate of a refrigerant from the condenser in (kl/min). R-134a Tables are attached! b) The mass flow rate of the air required for cooling...
oblem 1: An air conditioner based on the theoretical single-stage cycle is using Refrigerant- 134a as...
oblem 1: An air conditioner based on the theoretical single-stage cycle is using Refrigerant- 134a as the refrigerant operates with a condensing temperature of 100°F and evaporating temperature of 0°F. The air conditioner produces 5 tons of refrigeration. Determine: (a) The coefficient of performance of the cycle and the rate of refrigerant flow. (b) The condenser of the air conditioner is designed to reject the heat from the refrigerant. Air (Cp 0.24 Btu/lb. °F, p 0.077 lb/ft3) flows across the...
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,...
Thin-walled aluminum tubes of diameter D = 10 mm are used in the condenser of an air conditioner....
Thin-walled aluminum tubes of diameter D = 10 mm are used in the condenser of an air conditioner. Under normal operating conditions, a convection coefficient of hi = 5000 W/m2 · K is associated with condensation on the inner surface of the tubes, while a coefficient of ho = 100 W/m2 · K is maintained by airflow over the tubes. a. What is the overall heat transfer coefficient if the tubes are unfinned? b. What is the overall heat transfer...
Carbon dioxide (CO2) is used for the gas cooled reactor in shell and tube heat exchanger...
Carbon dioxide (CO2) is used for the gas cooled reactor in shell and tube heat exchanger type steam generator (shown in Figure 2). 90000 kg/h entered to the exchanger under pressure and temperature of 4 bar and 500 OC respectively. The steam saturation temperature is 250 oC when the carbon dioxide leave the generator at 3300C. Presume the formed steam is saturated and dry. Using 25 mm inner diameter and 2 mm wall thickness, a copper tube is designed for...
System Model: Automotive Air Conditioning System Outside Air Temp: 45 oC Car Interior Air Temp: 22...
System Model: Automotive Air Conditioning System Outside Air Temp: 45 oC Car Interior Air Temp: 22 oC Heat Load = 4.2 kJ/sec rate at which heat must go in to the air conditioner to be removed from the car’s interior Refrigerant: R134a HINT: Heat enters an air conditioning system where? Refrigerant 134a … - leaves the evaporator coil and enters the compressor as a saturated vapor at the evaporator pressure of 2.8 bars. - It leaves the compressor at...
During air cooling of oranges, grapefruit, and tangelos, the heat transfer coefficient for combined convection, radiation,...
During air cooling of oranges, grapefruit, and tangelos, the heat transfer coefficient for combined convection, radiation, and evaporation for air velocities of 0.11<V< 0.33 m/s is determined experimentally and is expressed as h = 5.05 KairRe131D, where the diameter Dis 0.1 m. Oranges are cooled by refrigerated air at 5°C and 1 atm at a velocity of 0.3 m/s. Given: The thermal conductivity of the orange is given to be k = 0.50 W/m°C. The thermal conductivity and the kinematic...
Problem 7.075 An air-cooled steam condenser is operated with air in cross flow over a square, in-line array of 400 tubes (NL = NT = 20), with an outside tube diameter of 20 mm and longitudinal and transverse pitches of SL = 60 mm and ST-42 mm, respectively. Saturated steam at a pressure of 2.455 bars enters the tubes, and a uniform tube outer surface temperature of Ts - 390 K may be assumed to be maintained as condensation occurs...
please show work thank you
An air-cooled steam condenser is operated with air in cross flow over a square, in-line array of 400 tubes (NL=NT-20), with an outside tube diameter of 20 mm and longitudinal and transverse pitches of SL-60 mm and ST = 63 mm, respectively. Saturated steam at a pressure of 2.455 bars enters the tubes, and a uniform tube outer surface temperature of Ts=390 K may be assumed to be maintained as condensation occurs within the tubes....
Problem 7.075 An air-cooled steam condenser is operated with air in cross flow over a square, in-line array of 400 tubes (N N-20), with an outside tube diameter of 20 mm and longitudinal and transverse pitches of s 60 mm and sr 84 mm, respectively. Saturated steam at a pressure of 2.455 bars enters the tubes, and a uniform tube outer surface temperature of T,-390 K may be assumed to be maintained as condensation occurs tudy ithin the tubes. (a)...
5. Refrigerant-134a at 700kPa, 70°C, and 8 kg/min is cooled by air in a condenser until it exits as a saturated liquid at the same pressure. The cooling air enters the condenser at 1MPa and 10°C and leaves at 17°C at the same pressure. Determine: a) Considering only the Refrigerant as a system, the heat transfer rate of a refrigerant from the condenser in (kl/min). R-134a Tables are attached! b) The mass flow rate of the air required for cooling...
oblem 1: An air conditioner based on the theoretical single-stage cycle is using Refrigerant- 134a as the refrigerant operates with a condensing temperature of 100°F and evaporating temperature of 0°F. The air conditioner produces 5 tons of refrigeration. Determine: (a) The coefficient of performance of the cycle and the rate of refrigerant flow. (b) The condenser of the air conditioner is designed to reject the heat from the refrigerant. Air (Cp 0.24 Btu/lb. °F, p 0.077 lb/ft3) flows across the...
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,...
Carbon dioxide (CO2) is used for the gas cooled reactor in shell and tube heat exchanger type steam generator (shown in Figure 2). 90000 kg/h entered to the exchanger under pressure and temperature of 4 bar and 500 OC respectively. The steam saturation temperature is 250 oC when the carbon dioxide leave the generator at 3300C. Presume the formed steam is saturated and dry. Using 25 mm inner diameter and 2 mm wall thickness, a copper tube is designed for...
During air cooling of oranges, grapefruit, and tangelos, the heat transfer coefficient for combined convection, radiation, and evaporation for air velocities of 0.11<V< 0.33 m/s is determined experimentally and is expressed as h = 5.05 KairRe131D, where the diameter Dis 0.1 m. Oranges are cooled by refrigerated air at 5°C and 1 atm at a velocity of 0.3 m/s. Given: The thermal conductivity of the orange is given to be k = 0.50 W/m°C. The thermal conductivity and the kinematic...
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