Abstract: In recent century due to technological advances and population have increased energy demand. Energy save and energy use efficiency has become important topic. Energy production, transmission process is related to heat transfer. When the heat transfer is enhancing at energy process, energy efficiency will increase. The heat transfer enhancement techniques are widely used in many applications in the heating process. These techniques are classified as active and passive techniques. The objective of this study is to increase heat transfer efficiencies in tube with passive techniques. For this purpose, various apparatus will place into inner tubes which increase the heat transfer surfaces. The experiments were performed with 3 different type apparatus. It was compare and analyzed efficiency of apparatus types.

• Publication Date: 16-Dec-2016
• DOI: 10.15224/978-1-63248-115-3-52
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Abstract: In this study an experimental system was set up from the original components of an automotive air conditioning (AAC) system. After than internal heat exchanger (IHX) and reversing valve were installed to use as heat pump and improve performance of it. For each mode of operations, the system was tested at five different compressor speeds between 800 and 2800 rpm with intervals of 400 rpm. In the heat pump mode operations without IHX, the temperatures of the air streams entering the evaporator and condenser were maintained at Tevap,ai=0°C – Tcond,ai=0°C, Tevap,ai=10°C –Tcond,ai=10°C and Tevap,ai=15°C – Tcond,ai=15°C. IHX was started up the temperatures of the air streams at the inlets of the evaporator and condenser were maintained at Tevap,ai=5°C – Tcond,ai=5°C, Tevap,ai=10°C –Tcond,ai=10°C and Tevap,ai=15°C – Tcond,ai=15°C. Using experimental data, performance parameters such as conditioned air stream temperature, compressor power, compressor mechanical power and compressor discharge t

• Publication Date: 16-Dec-2016
• DOI: 10.15224/978-1-63248-115-3-57
• Views: 0
• Downloads: 0