SOLAR ENERGY UTILISATION FOR PROVIDING AND MAINTAINING OPTIMAL MICROCLIMATIC CONDITIONS OF GREENHOUSE CUCUMBER. PART I: THERMAL PERFORMANCE ANALYSIS OF SOLAR WATER HEATER

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 h to 15:00 h. The useful heat gain, hourly solar energy collected and hourly solar energy stored of this solar water heater are found higher for nail twist pitch ratio 4.787. The above said parameters are found to be a peak at noon and observed to follow the path of variation of solar intensity. At the starting of the experiment, the value of charging efficiency is observed to be maximum. Whereas the maximum value of instantaneous efficiency and overall thermal efficiency are observed at noon. The key finding is that the nail twist pitch ratio enhances the overall thermal performance of the CPCSWH.

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Modernization of Water Treatment System at Agricultural Enterprises Due to Introduction of Solar Energy

Elektrotekhnologii i elektrooborudovanie v APK ◽

10.22314/2658-4859-2020-67-1-142-147 ◽

2020 ◽

Vol 67 (1) ◽

pp. 142-147

Author(s):

Alina A. Aleksandrova ◽

Maksim S. Zhuzhin ◽

Yuliya M. Dulepova

Keyword(s):

Mathematical Model ◽

Water Treatment ◽

Solar Energy ◽

Energy Saving ◽

Electric Energy ◽

Solar Water Heater ◽

Water Heater ◽

Agricultural Enterprises ◽

Solar Water ◽

The Cost

Energy saving today is an integral part of the development strategy of agricultural organizations. Considerable attention is paid to the modernization and automation of technological processes in agricultural enterprises, which can improve the quality of work and reduce the cost of production. The direction of modernization is to reduce the consumption of electric energy by improving the water treatment system in livestock complexes. (Research purpose) The research purpose is to determine the potential of solar energy used in the Nizhny Novgorod region and to determine the possibility of its use for water heating in livestock complexes and to consider the cost-effectiveness of using a device to heat water through solar energy. (Materials and methods) Authors used an improved algorithm of Pixer and Laszlo, applied in the NASA project «Surface meteorology and Energy», which allows to calculate the optimal angle of inclination of the device for heating water. (Results and discussion) Designed a mock-up of a livestock complex with a solar water heater installed on the roof, protected by patent for invention No. 2672656. A mathematical model was designed experimentally to predict the results of the plant operation in non-described modes. (Conclusions) The article reveales the optimal capacity of the circulation pump. Authors have created a mathematical model of the device that allows to predict the water heating in a certain period of time. The article presents the calculations on the energy and economic efficiency of using a solar water heater. An electric energy saving of about 30 percent, in the economic equivalent of 35 percent.

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Research of Water Heater Automatic System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.301-303.373 ◽

2011 ◽

Vol 301-303 ◽

pp. 373-376

Author(s):

Ting Jun Li ◽

Qin Xu ◽

Jian Cun Ren ◽

Bing Zhi Huang ◽

Ming Bo Zhu

Keyword(s):

Solar Energy ◽

Energy Saving ◽

Environmental Protection ◽

Automatic System ◽

Solar Water Heater ◽

Water Heater ◽

Solar Water ◽

Software And Hardware

With environmental protection, energy saving awareness has enhanced, the use of solar energy has become a trend. Designing a large solar water heater automatic system, which adapts for heating and bathing. It introduces the system’s form, and the study of software and hardware. The system achieves a complementarily to the light, heat and electricity, and achieves the measurement, display of temperature and water.

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Performance Analysis and Optimization of Fresnel Lens Concentrated Solar Water Heater

Journal of Solar Energy Engineering ◽

10.1115/1.4041846 ◽

2018 ◽

Vol 141 (3) ◽

Cited By ~ 2

Author(s):

Vinod Kumar Soni ◽

R. L. Shrivastava ◽

S. P. Untawale ◽

Kshitij Shrivastava

Keyword(s):

Life Cycle ◽

Performance Analysis ◽

Flat Plate ◽

Mass Flow ◽

Critical Parameters ◽

Total System ◽

Outlet Temperature ◽

Solar Water Heater ◽

Water Heater ◽

Solar Water

Concentrated solar power (CSP) is a mature and efficient technology to cater the large-scale demand of hot water. Conventional reflectors/mirrors in CSP share 50% of total system cost. High installation as well as O&M cost is the major concern in reflector-based CSP. Apart from the above, manufacturing defects and adverse service environment cause premature degradation of reflectors and substantial drop in efficiency and service life. Performance analysis of an innovative optically concentrated solar water heater (OCSWH) using plurality of Fresnel lenses of poly methyl methacrylate (PMMA) is presented in the work. Size and yield of any solar water heater (SWH) are mainly dependent on its aperture area, output temperature, and mass flow rate, which are termed herein as critical parameters. Series of experimentations is carried out by varying critical design and operating parameters viz. aperture area, outlet temperature, and rate of mass flow, and similar experimentation is also carried out on commercially available flat plate SWH to compare its performance. Loss of heat from riser and header pipes is restricted by application of effective insulation. Substantial improvement in collector efficiency, increase in rate of mass flow, and rise in discharge temperature with reference to flat plate collector are noted. Economics is also studied covering life cycle cost (LCC), life cycle saving (LCS), and energy payback period.

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