• Energy Research
• 6. Clean water close

Abstract The performance of two-bed silica gel-water adsorption chiller using flat-tube adsorbers is modelled in wide range of operating conditions: heating water inlet temperature in the range of 50–90 °C, cooling water inlet temperature in the range of 20–35 °C, chilled water inlet temperatures of 10 °C and 15 °C, switching time 420 s and silica gel grain size 0.3 mm. In order to improve Coefficient of Performance (COP) and Specific Cooling Power (SCP) of the chiller optimization of fin height and spacing of the flat-tube heat exchanger is carried out. Flat-tube heat exchangers are found to be suitable for application as silica gel-water adsorbers. They are characterized by distinctive SCP (up to 750 W kg - 1 ). Optimization of flat-tube adsorbers geometry led to improvement of COP up to 3.7% and SCP up to 6.3%.

This paper investigates the influence of low-pressure glow plasma water treatment on boiling phenomenon. The presented results show the novel influence and potential new applications of low-pressure glow plasma treated water. Low-pressure glow plasma water treatment affects some of its physical properties such as surface tension, pH, and electric conductivity; this is due to changes in the water structure. An experimental analysis aimed to investigate the effect of such a treatment on the boiling heat transfer coefficient of water, and to assess the stability of GPTW. The experiments were carried out at atmospheric and reduced pressure for heat fluxes up to 70 kW/m2. The analysis shows significant deterioration of the boiling heat transfer coefficient under reduced pressure. In addition, the plasma treatment process had no significant effect on the thermal conductivity of water, as confirmed experimentally. A slight increase was observed, but it was within the measuring error range of the instruments used.