The air conditioning system in a new Van for use in the desert is to size....
The air conditioning system in a new Van for use in the desert is to size. The system maintained an interior temperature of 20 ° C when the Van travels at 100 km / h through dry air at 30 ° C at night. If the upper part of the van can be idealized as a flat plate 6 m long and 2 m wide, and the sides as flat plates 3 m high and 6 m long and 2 m wide, and the sides as flat plates 3 m high and 6 m m long, calculate the heat rate that must be removed from the interior to maintain the specified comfort conditions. Suppose that the Tsi is 28 ° C
*forced external coefficient
*natural interior coefficient
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The air conditioning system in a new Van for use
in the desert is to size....
Name: QUESTION 1 [25 Points] Moist air enters an air conditioning system at a dry bulb...
Name: QUESTION 1 [25 Points] Moist air enters an air conditioning system at a dry bulb temperature T., 30 'C and relative humidity фі80% and exits at a dry bulb temperature T2 179C and relative humidity ф2.50% as shown in the figure below. The condensate exits the system at 15 °C. The mass flow rate of the dry air is 2.5 kg/s. Assume the air is at atmospheric pressure P-101.3 kPa. Cooling coils T-17 C 0-50 % Pp:-6.282 kPa Ti-30...
Q2 A main trunk duct of air-conditioning system shown in Figure 2 is rectangular in cross-section...
Q2 A main trunk duct of air-conditioning system shown in Figure 2 is rectangular in cross-section (40 cm x 80 cm). Air at atmospheric pressure and temperature of 20c flows inside the duct with velocity of 7 m/s. The cross sectional srea snd definition of characteristic length for the duct are given in Figure 2. The duct is assumed to be m long. The flow inside the duct is assumed fully developed. (a)Find properties of air using suitable value of...
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...
3. A manufacturing company is planning to install an air-conditioning system at its main office. The...
3. A manufacturing company is planning to install an air-conditioning system at its main office. The company receives two offers, System A and System B. Both systems are suitable for use by the company. The costs of both systems are tabulated in TABLE Q3. Assume both systems will provide comparable comfort service and will be used for 10 years. Interest rate is 10%. The air-conditioning will only be operated from year 2 onwards. TABLE Q3 No System A (RM) 55,000...
(7) An air conditioning system requires 0.0001 m/s of R-12 refrigerant to be pumped through a...
(7) An air conditioning system requires 0.0001 m/s of R-12 refrigerant to be pumped through a 6.5 m long copper pipe (relative roughness, ε/D = 1 x 10-4) with 0.01 m diameter in a coil pattern connected by eight 180° bends (the bends are the only sources of minor loss). The viscosity of the refrigerant is u = 2.60 x 10-4 N.s/mand its density is 1330 kg/m². (a) Determine the friction factor for flow through the pipe. [15 %] (b)...
Exercise 2 Air at 20 °C and 1 atm flows over a flat plate at 50...
Exercise 2 Air at 20 °C and 1 atm flows over a flat plate at 50 m/s. The plate is 300 cm long and is maintained at 60C. The width of the plate is 2 m. The critical Rec = 5 x 105 The properties are Conductivity k = 0.0263 W/mK, kinematic viscosity nu = v = 15.89 x 10-6 m²/s, Prandtl number is Pr=0.707 Density rho = p = 1.128 kg/m3 1. Determine the critical length Xc 2. Determine...
QUESTION 2 [20 Marks] An air conditioned room that stands on a well ventılated basement measures...
QUESTION 2 [20 Marks] An air conditioned room that stands on a well ventılated basement measures 3 m wide high and 6 m deep One of the two 3 m walls faces west and contains a do window of sıze 1 5 m by 1 5 m, mounted flush with the wall with no external s shading T the follo are no heat gains through the walls other than the one facing east From nformation Inside conditions 25 °C dry...
11:38 3 of 6 MEN 211 Natre Dame Univenity Mechanical Engineering Dep An air conditioning system is composed of a cooling pat and a ming pat shown in the ollowing fgure. The cooling losd is ensure...
11:38 3 of 6 MEN 211 Natre Dame Univenity Mechanical Engineering Dep An air conditioning system is composed of a cooling pat and a ming pat shown in the ollowing fgure. The cooling losd is ensured by a retrigeration cycle opersting with retrigerant R. 134a Mod arst a pressure of 1 bar,atenperstue of35°C-are tive hundty ot 35 % ardo fow rate of 100 m3h is mbed with ar at 1 bar, 24°C.50% RH and S00 m3p, The mot e at...
Design Problem Design a small chiller room 2.35 m wide by 6 m long and 2.38...
Design Problem Design a small chiller room 2.35 m wide by 6 m long and 2.38 m high that is to be used to chill and store a food product. The chiller is to be loaded with 60 buckets of the food product at 23 °C which needs to be cooled down to 3 °C within 24 hours using air at 1 °C, with a heat transfer coefficient of 36 W m2 K Tasks 1. Calculate the peak refrigeration loading...
Internal Flow Homework 1 Cooling water available at 10°C is used to condense steam at 30°c...
Internal Flow Homework 1 Cooling water available at 10°C is used to condense steam at 30°c in the condenser of a power plant at a rate of 0.60 kg/s by circulating the cooling water through a bank of 5-m-long 1.2-cm-internal-diameter thin copper tubes. Water enters the tubes at a mean velocity of 4 m/s, and leaves at a temperature of 24°C. The tubes are nearly isothermal at 30°C. Determine the average heat transfer coefficient between the water and the tubes,...
Name: QUESTION 1 [25 Points] Moist air enters an air conditioning system at a dry bulb temperature T., 30 'C and relative humidity фі80% and exits at a dry bulb temperature T2 179C and relative humidity ф2.50% as shown in the figure below. The condensate exits the system at 15 °C. The mass flow rate of the dry air is 2.5 kg/s. Assume the air is at atmospheric pressure P-101.3 kPa. Cooling coils T-17 C 0-50 % Pp:-6.282 kPa Ti-30...
Q2 A main trunk duct of air-conditioning system shown in Figure 2 is rectangular in cross-section (40 cm x 80 cm). Air at atmospheric pressure and temperature of 20c flows inside the duct with velocity of 7 m/s. The cross sectional srea snd definition of characteristic length for the duct are given in Figure 2. The duct is assumed to be m long. The flow inside the duct is assumed fully developed. (a)Find properties of air using suitable value of...
3. A manufacturing company is planning to install an air-conditioning system at its main office. The company receives two offers, System A and System B. Both systems are suitable for use by the company. The costs of both systems are tabulated in TABLE Q3. Assume both systems will provide comparable comfort service and will be used for 10 years. Interest rate is 10%. The air-conditioning will only be operated from year 2 onwards. TABLE Q3 No System A (RM) 55,000...
(7) An air conditioning system requires 0.0001 m/s of R-12 refrigerant to be pumped through a 6.5 m long copper pipe (relative roughness, ε/D = 1 x 10-4) with 0.01 m diameter in a coil pattern connected by eight 180° bends (the bends are the only sources of minor loss). The viscosity of the refrigerant is u = 2.60 x 10-4 N.s/mand its density is 1330 kg/m². (a) Determine the friction factor for flow through the pipe. [15 %] (b)...
Exercise 2 Air at 20 °C and 1 atm flows over a flat plate at 50 m/s. The plate is 300 cm long and is maintained at 60C. The width of the plate is 2 m. The critical Rec = 5 x 105 The properties are Conductivity k = 0.0263 W/mK, kinematic viscosity nu = v = 15.89 x 10-6 m²/s, Prandtl number is Pr=0.707 Density rho = p = 1.128 kg/m3 1. Determine the critical length Xc 2. Determine...
QUESTION 2 [20 Marks] An air conditioned room that stands on a well ventılated basement measures 3 m wide high and 6 m deep One of the two 3 m walls faces west and contains a do window of sıze 1 5 m by 1 5 m, mounted flush with the wall with no external s shading T the follo are no heat gains through the walls other than the one facing east From nformation Inside conditions 25 °C dry...
11:38 3 of 6 MEN 211 Natre Dame Univenity Mechanical Engineering Dep An air conditioning system is composed of a cooling pat and a ming pat shown in the ollowing fgure. The cooling losd is ensured by a retrigeration cycle opersting with retrigerant R. 134a Mod arst a pressure of 1 bar,atenperstue of35°C-are tive hundty ot 35 % ardo fow rate of 100 m3h is mbed with ar at 1 bar, 24°C.50% RH and S00 m3p, The mot e at...
Design Problem Design a small chiller room 2.35 m wide by 6 m long and 2.38 m high that is to be used to chill and store a food product. The chiller is to be loaded with 60 buckets of the food product at 23 °C which needs to be cooled down to 3 °C within 24 hours using air at 1 °C, with a heat transfer coefficient of 36 W m2 K Tasks 1. Calculate the peak refrigeration loading...
Internal Flow Homework 1 Cooling water available at 10°C is used to condense steam at 30°c in the condenser of a power plant at a rate of 0.60 kg/s by circulating the cooling water through a bank of 5-m-long 1.2-cm-internal-diameter thin copper tubes. Water enters the tubes at a mean velocity of 4 m/s, and leaves at a temperature of 24°C. The tubes are nearly isothermal at 30°C. Determine the average heat transfer coefficient between the water and the tubes,...
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