IMPROVEMENT OF PROTOTYPE OF CO{sub}2 COMBINED AIR CONDITIONING AND TAP WATER HEATING PLANT

摘要

Research and development of a combined carbon dioxide (CO{sub}2) air conditioning and tap water heating plant has been performed at Thermodynamics Laboratory, Institute Technology of Bandung. This paper discuss modification of the plant with the objective was to increase the plant cooling COP and to make the plant more compact. New heat exchangers which higher effectiveness were redesigned to increase cooling COP and to reduce overall plant dimension. The experimental results show that the new heat exchangers have improved the cooling COP of the plant. The maximum discharge pressure during experiments was 85 bar and the suction pressure was 34 bar at chilled water mass flow of 0.23 kg/s. On 85 bar discharge pressure, the cooling COP based on the evaporator load and the electrical consumption of the compressor was 2.52, compared to cooling COP 2.20 before modification. On water heating side, 210 litres tap water temperature of 60°C was reached within two hours.