![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 bulb, 50% relative humidity Outside conditions 43 C dry buib, 24 °C wet bulb, density of dry air 1 095 kg/ms U-value for wall 1 78 W/m2 K U-value for floor 1 2 W/m2 K U-value for glass 3 12 W/m2 K Cooling load temperature difference (CLTD) for wail 25 °C Cooling load temperature difference (CLTD) for roof 30 °C Solar Heat Gain (SHGFmax) of glass 300 W/m2 Internal Shading Coefficient (SC) of glass 0 86 Cooling load factor (CLF) 10 Occupancy 4 people (90 W sensible heat/person) (40 W latent heat/person) Lighting load 33 W/m2 of floor area Appliance load 600 W (Sensible) +300 W (latent) Infiltration rate 8 2125 x 103 kg/s Barometric pressure 101 kPa](http://img.homeworklib.com/questions/1aa54e90-bff1-11eb-a72a-15f27e783439.png?x-oss-process=image/resize,w_560)
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QUESTION 2 [20 Marks] An air conditioned room that stands on a well ventılated basement measures...
For a 400 m-area concrete middle floor office space of a muti-story office building located in...
For a 400 m-area concrete middle floor office space of a muti-story office building located in Barcelona, Spain; that is operating from 8:00 a.m. till 4:00 p.m. with 100 m west facing glass and 40 occupants. The space has carpeted floor, one exposed wall, interior gypsum partitions, and drop ceiling find the following @ 3:00 p.m.: a). Cooling load due to Glass (conduction, solar, total). b). Cooling load due to Occupants (sensible and latent). c). Cooling load due to Lighting...
In an air-conditioned office, the dry bulb temperature of the supply air is 15°C. The state...
In an air-conditioned office, the dry bulb temperature of the supply air is 15°C. The state of air in the office has dry bulb temperature of 26°C and relative humidity of 52%. By using anemometer, it is measured that the flow rate of the recirculated air is 60.34 m3 /min. The HVAC system takes 18 m3 /min of outdoor air at 35°C and 55% relative humidity. The sensible heat ratio for the cooling coil is known to be 50%. Determine:...
1 2 Calculate the following cooling load components at 18:00 hour of August month for the...
1
2
Calculate the following cooling load components at 18:00 hour of August month for the shown hall: (a) Heat transferred through floor, ceiling and doors. (b) Heat gain due to solar effects. (c) Heat gain through the glass windows. (d) Heat gain due to occupants. (e) The heat gain due to lights. (1) Heat transmitted due to infiltration. (g) The total cooling load. The following data are given: The ceiling height is 3.0 m. The hall has eight glass...
a. the sensible heat ratio (SHR) for the cooling and dehumidifying process; (2 Marks) b. the...
a. the sensible heat ratio (SHR) for the cooling and
dehumidifying process; (2 Marks) b. the supply air volume flow rate
to the office in m3 /s; (5 Marks) c. the air dry bulb temperature
and specific enthalpy of the mixture of outdoor and recirculating
air; (4 Marks) d. the cooling coil’s load in kW. (5 Marks) e. the
apparatus dew point during the cooling and dehumidifying process;
and (4 Marks) f. Discuss, with reasons, the possible effects on the...
Subject Refrigeration and Air Conditioning. Please answer in detail. QUESTION 4 - COOLING AND DEHUMIDIFYING COILS...
Subject Refrigeration and Air Conditioning. Please answer in
detail.
QUESTION 4 - COOLING AND DEHUMIDIFYING COILS An air conditioned space at 1700 metres altitude has a sensible heat gain of 26 kW and a latent heat gain of 6.5 kW. The space is maintained at 25°C dry bulb and 18°C wet bulb temperature:s The fresh air supply is to be 0.65 m3/s at 35°C dry bulb and 24°C wet bulb temperatures. The air leaving the coil has a relative humidity...
a) What is the difference between latent and sensible heat gains in building cooling load analysis?...
a) What is the difference between latent and sensible heat gains in building cooling load analysis? Provide examples of each (2 marks) b) In heating load calculations, it is a normal practice to neglect the solar heat gain Explain why. (2 marks) c) An air conditioned single family detached house with a Figure_Q6A is located in Perth, Australia (Latitude 31° South). The ceiling height is 24 m. The summer floor plan shown in design indoor temperature is 25°C. Outside design...
An Conference Center is to be air-conditioned for a seating capacity of 3200 people for the...
An Conference Center is to be air-conditioned for a seating capacity of 3200 people for the following outdoor and comfort conditions a) Outdoor design conditions = 35 °C, db and 65% R.H b) Indoor/return design conditions-26 deg C. db and 55% RH. c) Total sensible room load = 420,000 kJ/hr d) Total latent room load = 200,000 KJ/hr e) The rise in dry bulb temperature of the air inside the conference center is limited to 9 °C (i.e. the Supply...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10 m) is being maintained at 2 °C using a vapor compression refrigeration system that uses R-134a. The evaporator and condenser temperatu...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10 m) is being maintained at 2 °C using a vapor compression refrigeration system that uses R-134a. The evaporator and condenser temperatures are -20 and 40°C, respectively. The walls and ceiling of the storage room is constructed of 15 cm thick concrete (thermal conductivity-1.37 WIm K]) and 4.3 cm thick insulation (thermal conductivity-0.04 W/[m K). The outside insulation surface temperature of the walls (or ceiling)...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10 m) is being maintained at 2 °C using a vapor compression refrigeration system that uses R-134a. The evaporator and condenser temperatures are -20 and 40°C, respectively. The walls and ceiling of the storage room is constructed of 15 cm thick concrete (thermal conductivity-1.37 WIm K]) and 4.3 cm thick insulation (thermal conductivity-0.04 W/[m K). The outside insulation surface temperature of the walls (or ceiling)...
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...
For a 400 m-area concrete middle floor office space of a muti-story office building located in Barcelona, Spain; that is operating from 8:00 a.m. till 4:00 p.m. with 100 m west facing glass and 40 occupants. The space has carpeted floor, one exposed wall, interior gypsum partitions, and drop ceiling find the following @ 3:00 p.m.: a). Cooling load due to Glass (conduction, solar, total). b). Cooling load due to Occupants (sensible and latent). c). Cooling load due to Lighting...
1
2
Calculate the following cooling load components at 18:00 hour of August month for the shown hall: (a) Heat transferred through floor, ceiling and doors. (b) Heat gain due to solar effects. (c) Heat gain through the glass windows. (d) Heat gain due to occupants. (e) The heat gain due to lights. (1) Heat transmitted due to infiltration. (g) The total cooling load. The following data are given: The ceiling height is 3.0 m. The hall has eight glass...
a. the sensible heat ratio (SHR) for the cooling and
dehumidifying process; (2 Marks) b. the supply air volume flow rate
to the office in m3 /s; (5 Marks) c. the air dry bulb temperature
and specific enthalpy of the mixture of outdoor and recirculating
air; (4 Marks) d. the cooling coil’s load in kW. (5 Marks) e. the
apparatus dew point during the cooling and dehumidifying process;
and (4 Marks) f. Discuss, with reasons, the possible effects on the...
Subject Refrigeration and Air Conditioning. Please answer in
detail.
QUESTION 4 - COOLING AND DEHUMIDIFYING COILS An air conditioned space at 1700 metres altitude has a sensible heat gain of 26 kW and a latent heat gain of 6.5 kW. The space is maintained at 25°C dry bulb and 18°C wet bulb temperature:s The fresh air supply is to be 0.65 m3/s at 35°C dry bulb and 24°C wet bulb temperatures. The air leaving the coil has a relative humidity...
a) What is the difference between latent and sensible heat gains in building cooling load analysis? Provide examples of each (2 marks) b) In heating load calculations, it is a normal practice to neglect the solar heat gain Explain why. (2 marks) c) An air conditioned single family detached house with a Figure_Q6A is located in Perth, Australia (Latitude 31° South). The ceiling height is 24 m. The summer floor plan shown in design indoor temperature is 25°C. Outside design...
An Conference Center is to be air-conditioned for a seating capacity of 3200 people for the following outdoor and comfort conditions a) Outdoor design conditions = 35 °C, db and 65% R.H b) Indoor/return design conditions-26 deg C. db and 55% RH. c) Total sensible room load = 420,000 kJ/hr d) Total latent room load = 200,000 KJ/hr e) The rise in dry bulb temperature of the air inside the conference center is limited to 9 °C (i.e. the Supply...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10 m) is being maintained at 2 °C using a vapor compression refrigeration system that uses R-134a. The evaporator and condenser temperatures are -20 and 40°C, respectively. The walls and ceiling of the storage room is constructed of 15 cm thick concrete (thermal conductivity-1.37 WIm K]) and 4.3 cm thick insulation (thermal conductivity-0.04 W/[m K). The outside insulation surface temperature of the walls (or ceiling)...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10 m) is being maintained at 2 °C using a vapor compression refrigeration system that uses R-134a. The evaporator and condenser temperatures are -20 and 40°C, respectively. The walls and ceiling of the storage room is constructed of 15 cm thick concrete (thermal conductivity-1.37 WIm K]) and 4.3 cm thick insulation (thermal conductivity-0.04 W/[m K). The outside insulation surface temperature of the walls (or ceiling)...
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...
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