Chemistry > QUESTIONS & ANSWERS > System Analysis (All)

System Analysis

Document Content and Description Below

System Analysis Figure A. System schematic of the centralized chiller system for the DATC building The DATC building houses a large hall for multi-purpose functions and its air-conditioning system i... s a centralized chiller system. Chilled water exits the chiller at 1oC, but the effects of pumping and ambient heating increase the water temperature to 4 oC as it enters the Air Handling Unit (AHU) of the DATC. The chilled water cools the air coming from the hall and then returns to the chiller system. In the AHU of the DATC building, chilled water enters at 4 oC and exits at 10 oC at a flow rate of 10 litres per minute. Air from the building is to be cooled from its initial temperature of 38 oC. The chiller system operates based on the vapour compression refrigeration cycle with a single stage compression and a water-cooled condenser. The isentropic efficiency of the compressor is assumed at 90%. The evaporator design is based on the shell-and-tube multipass heat exchanger. The refrigerant enters and exits through the shell at its saturation temperature, while the chilled water flows through the tube and exits the evaporator at 1oC. For this air-conditioning system: 2. Assuming that the heat loss to the surrounding during the heat exchange process in the AHU is 10% from the emitted heat transfer rate, plot the changes in air exit temperature if the air flow rate into the AHU ranges from 1000 to 5000 litres per minute. Then, identify the suitable operating range for the airflow into the AHU to meet the standard comfort temperature requirement. [CO2] [Show More]

Last updated: 2 years ago

Preview 1 out of 11 pages

Buy Now

Instant download

We Accept: