Abstract
Air is usually compressed adiabatically in the compressor. As the operating speed of compressors can be several thousand rpm, heat generated during compression cannot be sufficiently transmitted to the environment in such a short time. It is for this reason that compressor efficiency is limited. Isothermal compression could be an alternative choice applied on industrial compressor and compressed air energy storage (CAES). This paper proposed a new kind of piston to perform isothermal compression. Surface area of such isothermal piston structure is larger. A certain amount of fluid at the chamber bottom absorbs the heat from the isothermal piston. Heat transfer between piston and fluid during compression is investigated. Air pressure is measured to validate the effectiveness of this proposed piston structure in heat transfer. Compression work of the proposed isothermal piston and conventional one is compared. One issue of this comparison is that air-liquid dissolution can affect the pressure and compression work. The influence of dissolution is quantified with Henry’s Law. Quantitative analysis is performed to determine that heat transfer is the dominant factor affecting the pressure and compression work. Some simple experiments are described in this paper, which shed light on that heat transfer could be significantly improved adopting this proposed isothermal piston.
Highlights
Pneumatic system is one of the three major power transmission systems in modern manufacturing, with the other two being electrical and hydraulic systems
Air compressors consume 5%–50% of the total energy of the whole manufacturing industry. They are driven by electrical motors and electricity consumption of industrial compressors accounts for about [1] 9% of China’s total electricity consumption (~6844 TWh in 2018)
Isothermal compression could potentially be applied to compressed air energy storage systems
Summary
Pneumatic system is one of the three major power transmission systems in modern manufacturing, with the other two being electrical and hydraulic systems. Air compressors consume 5%–50% of the total energy of the whole manufacturing industry. While for isothermal compression, heat transfer between air and environment is sufficient and air temperature remains constant. In order to improve compressor efficiency, study on compression isothermal condition. Study on enhancementisofunder heat transfer is essential to achieve isothermal compression. Isothermal bebe applied to to compressed air air energy storage systems [3]. Isothermal compression could potentially be applied to compressed air energy storage systems. The concept of compressed air energy storage (CAES) was first proposed in the 1940s. There are maincondition approaches improve turnaround efficiency compression in two adiabatic andto recycling thethe compression heat;. Compression in isothermal condition to reduce the compression heat. Isothermal condition to reduce the compression heat.
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