4. The following data refer to an air conditioning system for industrial process for hot and...
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...
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...
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...
4. Air-Conditioning Unit [20 Marks] 1 m3/s of moist air at 32 °C with a relative humidity of 70% is to be treated by a simple air condition system to produce air at 18 °C with a relative humidity of 50% The system will have two stages. In the first stage, the air will pass over cooling coils to dehumidify it, and in the second stage it will be heated electrically to the specified outlet conditions You may ignore 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...
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,...
A building is designed for the following cooling loads. Room specific heat gain and latent heat gains are 310 kW and 100 kW respectively. The room is maintained at a dry bulb temperature of 25°C and relative humidity of 50%. The outdoor air is at 28°C with 50% relative humidity, 10% by mass of outdoor air is supplied to the building. If the air supplied to the room should be at a temperature lower than 18°C, detemine the following. (a)...
AIR HEATING/COOLING HEAT PUMP sketch of a heat pump receiving outdoor air, determine the following. Assume the heat capacity of air is 1.0 kJkg-K. (a) If the supply air mass flow rate and temperature (Point 3) are 0.8 kg/s and 39.7"C, and the return air temperature (Point 4) is 22C, the heating rate of the heat pump is kW. (Express your answer to one decimal place.) itthere is NO heat reco e yurt and 25% of the air is exhausted...
b) A cooling coil of an Air Handling Unit has dew-point of 8'C dry-bulb (db) temperature, and outdoor air enters the cooling equipment at 28 C d.b temperature and leaves at 16'C d.b temperature with mass flow rate of lkg/s determine: i) the contact factor (CF) ii) the volume flow rate iii) the by-pass factor iv) the sensible heat that removed from the outdoor air (1.5 mark) (1.5 marks) (1 mark) (2.0 marks) c) Explain the difference between "relative humidity...
b) A cooling coil of an Air Handling Unit has dew-point of 8'C dry-bulb (db) temperature, and outdoor air enters the cooling equipment at 28 C d.b temperature and leaves at 16'C d.b temperature with mass flow rate of lkg/s determine: i) the contact factor (CF) ii) the volume flow rate iii) the by-pass factor iv) the sensible heat that removed from the outdoor air (1.5 mark) (1.5 marks) (1 mark) (2.0 marks) c) Explain the difference between "relative humidity...