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(15) The required inside conditions are 24 °C and 50% RH, and the outdoor design conditions...
A summer air conditioning system with recirculating air stream and BPF = 0 has a room sensible heat load of 20 kW and a room latent heat load of 2.22 kW. The required inside conditions are 22\degc and 50% RH, and the outdoor design conditions are 36\degc
A summer air conditioning system with recirculating air stream and BPF = 0 has a room sensible heat load of 20 kW and a room latent heat load of 2.22 kW. The required inside conditions are 22°C and 50% RH, and the outdoor design conditions are 36°C and 60% RH. The mass flow rate of the outside air is 15% of the mass flow rate of the supply air. Find a) RSHF b) the point s on the chart, mass...
3. Room-1 is at 20°C DB and 80% RH. Room-2 is at 25°C DB and 40%...
3. Room-1 is at 20°C DB and 80% RH. Room-2 is at 25°C DB and 40% RH. Which room has the higher heat content? Use ASHRAE psychrometric chart. 4. A room is at 35°C DB and 50% RH. An air-conditioning unit starts to cool the air. At what temp will the moisture in the air start to condense? What are the initial and final enthalpies and humidity ratios?
O question: An airconditioned space is to be maintained at 26 C dry bulb temperature and 50% RH. ...
o question: An airconditioned space is to be maintained at 26 C dry bulb temperature and 50% RH. The ambient condition is 4 27.78 kW and the latent load is 11.11 kW. 60% of the return air mass is recirculated and mixed with 40% of make-up fresh air before entering the AHU. Calculate: Room SHF -Supply flow rate (m'/sec) (assume supply temperature is 10 C lower than space's) Apparatus sensible and latent load Apparatus sensible heat factor, dew point, and...
1) In a low-temperature drying operation, air at 60°C and 10% RH is being passed over...
1) In a low-temperature drying operation, air at 60°C and 10% RH is being passed over diced carrots at the rate of 20 kg dry air/s. The constant rate of evaporation of water from the carrots was measured as 0.16 kg moisture/s. Estimate the temperature and RH of the air leaving the dryer. (8 pts) 2) 100 kg of bulghur with an initial moisture content of 80% on wet basis and a surface area of 12 m² is dried in...
Question 4 Page 15 It is required to 125 marks] design a cold storage for storing...
Question 4 Page 15 It is required to 125 marks] design a cold storage for storing vegetables with the following available data Outside design conditions 36°C DBT. 28 C WBT Inside design conditions T2 19°C DBT, 60% RH Infiltrated air 180 mhr V ms-7.83 kg/s Fresh air supplied from outside 4500 mhr Total mass of air supplied to the room Sensible heat gain through glass SH,5.5AW Sensible heat gain through walls and roof H 10.8 kW Ihr KJ Sensible heat...
a) What is the physical interpretation of the wet-bulb temperature? b) During winter time a room...
a) What is the physical interpretation of the wet-bulb temperature? b) During winter time a room is maintained at a steady temperature and humidity by an air-conditioning system shown. 200 m/min of room return air at 30°C, 50% relative humidity is first mixed with 40 m/min of outdoor at 10°C, 20% relative humidity. The mixed air is then introduced to a heater where the temperature of the air is raised to 45°C and supplied to the room. [Note that air...
a) What is the physical interpretation of the wet-bulb temperature? b) During winter time a room...
a) What is the physical interpretation of the wet-bulb temperature? b) During winter time a room is maintained at a steady temperature and humidity by an air-conditioning system shown. 200 m/min of room return air at 30°C, 50% relative humidity is first mixed with 40 m/min of outdoor at 10°C, 20% relative humidity. The mixed air is then introduced to a heater where the temperature of the air is raised to 45°C and supplied to the room. [Note that air...
a) What is the physical interpretation of the wet-bulb temperature? b) During winter time a room...
a) What is the physical interpretation of the wet-bulb temperature? b) During winter time a room is maintained at a steady temperature and humidity by an air-conditioning system shown. 200 m3/min of room return air at 30°C, 50% relative humidity is first mixed with 40 m/min of outdoor at 10°C, 20% relative humidity. The mixed air is then introduced to a heater where the temperature of the air is raised to 45°C and supplied to the room. [Note that air...
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...
PROBLEM 2. (20 POINTS) A space to be maintained at 25 C dB (dry bulb) temperature and 18°C wB (we...
PROBLEM 2. (20 POINTS) A space to be maintained at 25 C dB (dry bulb) temperature and 18°C wB (wet bulb) has a rate of sensible-heat gain of 25 kWand a rate of moisture gain of20 kg/hr. Moist air enters the space at a dry-bulb temperature of 15°C. Outdoor air at 35 C dB temperature and 25 C wB is supplied for ventilation purposes at a rate of 400 Us (litres per second) of standard air. After leaving the room,...
3. Room-1 is at 20°C DB and 80% RH. Room-2 is at 25°C DB and 40% RH. Which room has the higher heat content? Use ASHRAE psychrometric chart. 4. A room is at 35°C DB and 50% RH. An air-conditioning unit starts to cool the air. At what temp will the moisture in the air start to condense? What are the initial and final enthalpies and humidity ratios?
o question: An airconditioned space is to be maintained at 26 C dry bulb temperature and 50% RH. The ambient condition is 4 27.78 kW and the latent load is 11.11 kW. 60% of the return air mass is recirculated and mixed with 40% of make-up fresh air before entering the AHU. Calculate: Room SHF -Supply flow rate (m'/sec) (assume supply temperature is 10 C lower than space's) Apparatus sensible and latent load Apparatus sensible heat factor, dew point, and...
1) In a low-temperature drying operation, air at 60°C and 10% RH is being passed over diced carrots at the rate of 20 kg dry air/s. The constant rate of evaporation of water from the carrots was measured as 0.16 kg moisture/s. Estimate the temperature and RH of the air leaving the dryer. (8 pts) 2) 100 kg of bulghur with an initial moisture content of 80% on wet basis and a surface area of 12 m² is dried in...
Question 4 Page 15 It is required to 125 marks] design a cold storage for storing vegetables with the following available data Outside design conditions 36°C DBT. 28 C WBT Inside design conditions T2 19°C DBT, 60% RH Infiltrated air 180 mhr V ms-7.83 kg/s Fresh air supplied from outside 4500 mhr Total mass of air supplied to the room Sensible heat gain through glass SH,5.5AW Sensible heat gain through walls and roof H 10.8 kW Ihr KJ Sensible heat...
a) What is the physical interpretation of the wet-bulb temperature? b) During winter time a room is maintained at a steady temperature and humidity by an air-conditioning system shown. 200 m/min of room return air at 30°C, 50% relative humidity is first mixed with 40 m/min of outdoor at 10°C, 20% relative humidity. The mixed air is then introduced to a heater where the temperature of the air is raised to 45°C and supplied to the room. [Note that air...
a) What is the physical interpretation of the wet-bulb temperature? b) During winter time a room is maintained at a steady temperature and humidity by an air-conditioning system shown. 200 m/min of room return air at 30°C, 50% relative humidity is first mixed with 40 m/min of outdoor at 10°C, 20% relative humidity. The mixed air is then introduced to a heater where the temperature of the air is raised to 45°C and supplied to the room. [Note that air...
a) What is the physical interpretation of the wet-bulb temperature? b) During winter time a room is maintained at a steady temperature and humidity by an air-conditioning system shown. 200 m3/min of room return air at 30°C, 50% relative humidity is first mixed with 40 m/min of outdoor at 10°C, 20% relative humidity. The mixed air is then introduced to a heater where the temperature of the air is raised to 45°C and supplied to the room. [Note that air...
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...
PROBLEM 2. (20 POINTS) A space to be maintained at 25 C dB (dry bulb) temperature and 18°C wB (wet bulb) has a rate of sensible-heat gain of 25 kWand a rate of moisture gain of20 kg/hr. Moist air enters the space at a dry-bulb temperature of 15°C. Outdoor air at 35 C dB temperature and 25 C wB is supplied for ventilation purposes at a rate of 400 Us (litres per second) of standard air. After leaving the room,...
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