DESIGN AND SIMULATION OF AIR CONDITIONING MACHINE WITH CAPACITY OF 50 KW USING R-410A

• Main Author: ABDILLAH (NIM : 13107092); Pembimbing : Dr. Ir. Ari Darmawan Pasek, FAHMI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/15597
• Institution: Institut Teknologi Bandung

Depletion of the ozone layer that occurred has resulted various international conventions to reduce and discontinue the use of HCFCs and CFCs. R-22 is one of HCFC refrigerants that could potentially damage the ozone so that its use will be reduced to 10% in 2015 under the Montreal Protocol. As an alternative refrigerant, R410-A has a characteristics that are close to R-22 and zero ODP (Ozone depletion Potential). The purpose of this research is to design an air conditioning machine with the refrigerant R-410A as an alternative refrigerant of R-22 and to determine the condition of its operations by doing simulations. The design includes a compressor and expansion valve selection and design of finned tube heat exchanger as the evaporator and condenser. The design of heat exchanger is done using the commercial software and using manual calculations. The <br /> <br /> <br /> manual calculations design also performed for R-22 so it can be compared with the results of the design for R-410A. <br /> <br /> <br /> This design results a configuration and dimensions of the heat exchanger and its differences between design by software and manual. In the evaporator, the difference in the area of heat exchanger is 14% with manual design has a <br /> <br /> <br /> greater finned width, while in the condenser by 38% with smaller finned width in manual design. The R-22 heat exchanger manual designed has a slightly differences total area from R-410A heat exchanger, which are 3% for evaporator and 7% for condenser. The simulation results showed the COP is 5,31, 3,92, and 3,00 for each 1800, 3600, and 5400 rpm compressor. As a conclusion, there is a difference in the value of heat transfer coefficient (U) between the software and manual calculations so that resulting a difference in a heat transfer surface area (A). This differences of U is caused by the differences of the heat exchanger configuration and model of refrigerant <br /> <br /> <br /> flow. The surface area for heat transfer in the evaporator dan condenser designed by software are respectively 86,45 m2 and 89,13 m2 while the manual design is 81,31 m2 and 55,2 m2. The conclusions from simulation results is the <br /> <br /> <br /> COP machine at design conditions is at 3,00 , this value is still above the COP recommendation from Indonesia National Standard, which is 2,60.