Cooling and dehumidification of air PDF

Experiment Title: Cooling and dehumidification of air using air conditioning Process
Name : Tan Suker
ID : 1804645
Group : P4
Date : 11 April 2021
Objectives:
(1) To be familiar with Psychrometric chart for cooling and dehumidifying process.
(2) To be able to determine the thermodynamic properties of air such as dry bulb temperature,
specific humidity (moisture content), relative humidity, specific volume and enthalpy by using
Psychrometric chart.

Experiments:
Identify the major working parts of the setup in the following diagram and discuss the process of
cooling and dehumidifying in brief
Figure 1 : Air conditioning Unit with base refrigeration system
Two major sections make up the refrigeration unit. The two sections are the base refrigeration unit &
air conditioning unit respectively.

The base refrigeration unit is made up of 4 main components. These components are the evaporator,
expansion valve, condenser and compressor. The base refrigeration unit runs of the principle of a
refrigeration cycle. The refrigeration cycle starts and ends at the compressor. The refrigerant used in
the experiment is R-14a. Refrigerant flows into the compressor where it is compressed to a high-
pressure gas, causing the temperature to rise. The hot gas then flows into the condenser where it is
cooled down by the exterior air or water to become a hot liquid. The liquid refrigerant then enters an
expansion valve where it cools down due to the pressure drop, resulting in a cold refrigerant. The cold
refrigerant from the expansion valve then enters the evaporator. It enters as a liquid state where heat
exchange takes place with the exterior air or water and therefore cooling the load inside the
refrigerator. As the liquid cools down the load, heat is absorbed turning it back into a gaseous state.
The gas is them pushed back into the compressor where the cycle will repeat again.