Abstract
This paper reports the overall thermal performance of a cylindrical parabolic concentrating solar water heater (CPCSWH) with inserting nail type twisted tape (NTT) in the copper absorber tube for the nail twist pitch ratios, 4.787, 6.914 and 9.042, respectively. The experiments are conducted for a constant volumetric water flow rate and during the time period 9:00 a.m. to 15:00 p.m. The useful heat gain, hourly solar energy collected and hourly solar energy stored in this solar water heater were found to be higher for the nail twist pitch ratio 4.787. The above said parameters were found to be at a peak at noon and observed to follow the path of variation of solar intensity. At the start of the experiment, the value of charging efficiency was observed to be maximum, whereas the maximum values of instantaneous efficiency and overall thermal efficiency were observed at noon. The key finding is that the nail twist pitch ratio enhances the overall thermal performance of the CPCSWH.
Highlights
In the present era, utilization of solar energy increases with the development of societies as well as the development of solar energy-collected techniques
Cylindrical parabolic concentrating solar water heater (CPCSWH) is one of the techniques that are extensively used in the fields of power generation and some chemical processing industries, due to it has few favorable characteristics, such as high temperature, ease of maintenance, compact size, and simple design
Jaramillo et al [19] found that the thermal performance significantly improves with twisted tape inserts in the absorber tube
Summary
Utilization of solar energy increases with the development of societies as well as the development of solar energy-collected techniques. Huang et al [1] used a black liquid as working fluid and investigated the thermal performance of a cylindrical parabolic solar collector They found better thermal performance using black liquid. Heiti and Thodos [2] compared the instantaneous efficiency obtained with and without a coated absorber tube Their results showed better instantaneous efficiency for the coated absorber tube. Hamad [3] studied the influence of water mass flow rate on the instantaneous efficiency of the cylindrical parabolic solar concentrator. Their result showed that instantaneous efficiency increases with an increase in water mass flow rate. Mullick and Nanda [4]
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