Define relative humidity, degree of saturation, specific humidity and dew point temperature.
Define ASHRAE comfort zone. What factors are caused for comfort air conditioning? Discuss in brief.
Define by-pass factor and contact factor. Describe the heating and humidification process.
Differentiate between sensible heating and sensible cooling process.
Write the importance of food preservation. What are the causes of food spoilage?
Enlist the methods of food freezing.
What are the basic elements of controlling of air conditioning?
2.0 m³/s of moist air at a state of 30°C DBT, 21°C WBT and 101.325 kPa flows across a cooler coil and leaves the coil at 12°C DBT and 8.2 g/kg of dry air. Determine i) the apparatus dew point ii) the contact factor and by-pass factor iii) cooling load.
Define psychometry and psychometric chart. Why is psychometric chart necessary? Define relative humidity, specific humidity and humidity ratio.
Define psychometric processes. Enlist the psychometric processes. Discuss any two of psychometric processes.
Moist air of DBT 30° C and WBT 22° C mixes adiabatically with another stream of moist air of DBT 12° C and WBT 5° C at atmospheric pressure. The mass flow rates of the streams are 3 kg/s and 2 kg/s respectively. What will be the DBT, WBT and relative humidity of the mixture?
What are the key factors for comfort air conditioning?
Define Psychrometry and Psychrometric processes. Enlist the Psychrometric processes. Briefly describe two of the Psychrometric processes.
Moist air of DBT 32°C and WBT 25°C mixes adiabatically with another stream of moist air of DBT 12°C and WBT 5°C at atmospheric pressure. The mass flow rates of the steams are 4 kg/s and 3 kg/s respectively. What will be the DBT, WBT and specific humidity of the mixture?
Define Psychometry and Psychometric chart. Describe the sensible heating and cooling method.
Define the following term: (Any Four) (i) Relative humidity (ii) Degree of saturation (iii) Dry bulb temperature (iv) Dew point temperature (v) Comfort Air-conditioning
Discuss briefly with neat sketch the four types of air-conditioning system.
The atmospheric air at 25°C DBT and 10°C WBT is flowing at the rate of 100m³/min through the duct. The dry saturated steam at 100°C is injected into the air stream at the rate of 70 kg/hr. Calculate the specific humidity and enthalpy of the leaving air.
What are the basic elements of air-conditioning control system? Discuss the self-actuated air-conditioning control system with figure.
Calculate the sound power level of (i) a whisper that emits of 1 MW and (ii) a rocket engine that emits 12 MW.
Define Psychometry and Psychometry chart. What is the necessity of Psychometric chart? Define relative humidity, specific humidity, dry bulb temperature and wet bulb temperature.
Describe the heating and Humidification by steam injecting showing the Psychometric process and Psychometric chart.
Velocity of air chosen through a circular duct which carries standard air is 360 m/min. The size of the duct is 0.3 m diameter. If this duct is replaced by a rectangular duct of aspect ratio 1.5. Determine the size of the rectangular duct for equal friction method. When (i) the velocity of air in two ducts is same, (ii) the discharge rate through the line duct is same.