Experiment 8 - Cooling and Dehumidification in Mechanical Engineering
This experiment delves into the principles of refrigeration, psychrometry, and relative humidity. It explores methods of cooling and dehumidification using thermodynamic concepts and psychrometric charts. Understanding these processes is crucial in the field of mechanical engineering.
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Presentation Transcript
Experiment 8 Cooling and Dehumidification SHEREEF SADEK ME 322
Experiment 8 Cooling and Dehumidification 2 Refrigeration Refrigeration is the achievement of a temperature below that of the immediate surroundings [1]. To maintain this lower temperature removal of heat from the product at low temperature and the discharge of this heat to a higher temperature is required. Methods of Refrigeration Rise in temperature of coolant Change of phase Expansion of a liquid Steady Flow expansion of a perfect gas Emptying process Electrical process 2/23/2025 ME 322 Mechanical Engineering Laboratory 1 (Thermo-Fluid)
Experiment 8 Cooling and Dehumidification 3 Psychrometry Psychrometry is the study of the properties of mixture of air and water vapor. Psychrometry is important since air is almost always mixed with water vapor All air-conditioning processes must factor in the presence of water vapor Psychrometric charts facilitates the calculation of processes involving a mixture of air and water-vapor The coordinates of a Psychrometric chart are the water vapor pressure as the ordinate (y-axe) and the mixture temperature as the abscissa (x-axe). The left boundary of the char t is the water saturation line, the region to the right is called superheated water vapor 2/23/2025 ME 322 Mechanical Engineering Laboratory 1 (Thermo-Fluid)
Experiment 8 Cooling and Dehumidification 4 2/23/2025 ME 322 Mechanical Engineering Laboratory 1 (Thermo-Fluid)
Experiment 8 Cooling and Dehumidification 5 2/23/2025 ME 322 Mechanical Engineering Laboratory 1 (Thermo-Fluid)
Experiment 8 Cooling and Dehumidification 6 Relative humidity ???????? ??????? ???????? ?? ????? ????? ?????????? ???????? ?? ???? ????? ?? ? ? ???? ??????????? Humidity Ratio ???? ? ?? ????? ????? ???? ? ?? ??? ??? ?? ? ? ??????? Wet bulb temperature The temperature indicated by a thermometer which has a wetted bulb in contact with blowing air. ? = ? = 2/23/2025 ME 322 Mechanical Engineering Laboratory 1 (Thermo-Fluid)
Experiment 8 Cooling and Dehumidification 7 ? ?? ??= ?.???? ? ???????????= ???? ?? ????????= ?? (?? ?? ) ?? ?? ????????= ???? (?? ?? ) ? ? ? Nomenclature ? ?? Orifice differential head (mm H2O) Specific volume of air calculated by assuming air to be a perfect gas. ?? ?? ??? ??? Air mass flow rate in kg/sec Specific humidity, kg/kg Specific enthalpy Refrigerant mass flow rate , Refrigerant enthalpies after and before the evaporator coil. ??? ??? ???? ??= ???? ?? ? ?? ? ???? 1 , 4 2/23/2025 ME 322 Mechanical Engineering Laboratory 1 (Thermo-Fluid)
Experiment 8 Cooling and Dehumidification 8 References Stoecker, W. F. Refrigeration and Air Conditioning . McGraw-Hill, 1958. 1. 2/23/2025 ME 322 Mechanical Engineering Laboratory 1 (Thermo-Fluid)
