scholarly journals An Experimental Investigation of the Efficiency of A Stationary Helical Solar Water Heater

2017 ◽  
Vol 12 (2) ◽  
pp. 250-257
Author(s):  
Mojtaba Moravej ◽  
Abdolkarim Soozanyar
Keyword(s):  
Experimental Investigation ◽  
Flow Rate ◽  
Thermal Energy ◽  
Thermal Efficiency ◽  
Solar Collector ◽  
Working Fluid ◽  
Solar Water Heater ◽  
Water Heater ◽  
Solar Water ◽  
Thermal Energy Conversion

The shape and geometry of a solar collector is an important factor in solar-to-thermal energy conversion. In this paper, a new stationary solar collector called helical solar collector was designed and investigated. The performance of this collector was experimentally studied using ASHRAE standard. Experiments were performed with water as a working fluid in the outdoor condition of Ahwaz, a city in the south of Iran. The findings indicate that the average of its thermal efficiency is about 53%, and that it can be used as an efficient new water heater. The experiments show that the efficiency of the helical solar water heater increases through adding the mass flow rate.

Experimental investigation of solar water heater equipped with a solar collector using waste oil as absorber and working fluid

Solar Energy ◽  
2020 ◽  
Vol 199 ◽  
pp. 630-644 ◽  
Author(s):  
Oussama Touaba ◽  
Mohamed Salah Ait Cheikh ◽  
Mohamed El-Amine Slimani ◽  
Ahmed Bouraiou ◽  
Abderrezzaq Ziane ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Solar Collector ◽  
Working Fluid ◽  
Solar Water Heater ◽  
Waste Oil ◽  
Water Heater ◽  
Solar Water

scholarly journals TO STUDY AND ANALYSIS OF SOLAR WATER HEATER USING VARIOUS MASS FLOW RATE

2020 ◽  
Vol 5 (3) ◽  
pp. 139-144
Author(s):  
Sunaina Sailani
Keyword(s):  
Solar Radiation ◽  
Mass Flow Rate ◽  
Flow Rate ◽  
Storage Tank ◽  
The Body ◽  
Solar Water Heater ◽  
Water Heater ◽  
Water Pipes ◽  
Solar Water ◽  
Circulating Water

Solar water heater is a device which is used for heating the water using of sun energy. This system is connected like as storage tank, centrifugal pump, pipes and glass. The circulating flexible water pipes are connected with the metallic pipe, which are assembled with the body. The solar radiation are achieving from sun and passing although glass and collector for the purpose of the heating the circulating water. In this way we are achieving the various temperatures using of circulating pump.

Numerical Investigation of Thermal Separators Within the Evacuated Tubes of a Water-in-Glass Solar Water Heater

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Asif Soopee ◽  
Abdel Anwar Hossen Khoodaruth ◽  
Anshu Prakash Murdan ◽  
Vishwamitra Oree
Keyword(s):  
Tilt Angle ◽  
Thermal Efficiency ◽  
Thermal Stratification ◽  
Maximum Deviation ◽  
Water Tank ◽  
Solar Water Heater ◽  
Water Heater ◽  
Solar Water ◽  
Thermal Distribution ◽  
Evacuated Tubes

The effects of thermal separators within the evacuated tubes of a water-in-glass solar water heater (SWH) were numerically investigated using the commercial computational fluid dynamics (CFD) software ANSYS fluent. To validate the three-dimensional (3D) model, an experiment was performed for the passive operation of the SWH for a fortnight period, of which 3 h of recorded data was selected. The Boussinesq's approximation was employed, and the respective solar irradiance and ambient temperature profiles were incorporated. A maximum deviation of only 2.06% was observed between the experimental and numerical results. The model was then adapted for the case where thermal separators are inserted within the evacuated tubes of the SWH and both cases were run for two tilt angles, 10 deg and 40 deg. The temperature and velocity profiles within the evacuated tubes were analyzed alongside the temperature contours, thermal stratification, and overall thermal efficiency of the SWH. At a 40 deg tilt, without thermal separators, the flow streams within the evacuated tubes are restrained, and a chaotic thermal behavior was observed, thereby restricting thermal distribution to the water stored in the SWH tank. A lower tilt angle (10 deg) provided a more desirable thermal distribution. With thermal separators, however, the tilt angle preference was reversed. A faster and more uniform thermal distribution was achieved within the water tank, with a sizeable reduction in the thermal stratification at a 40 deg tilt. The overall thermal efficiency of the SWH was improved by 4.11% and 4.14% for tilt angles of 10 deg and 40 deg, respectively.

Application of Supercritical Carbon Dioxide for Solar Water Heater

2017 ◽  
pp. 215-234
Author(s):  
Yuhiro Iwamoto ◽  
Hiroshi Yamaguchi
Keyword(s):  
Heat Exchanger ◽  
Solar Collector ◽  
Supercritical Co2 ◽  
Large Change ◽  
Solar Water Heater ◽  
Water Heater ◽  
Solar Water ◽  
Small Change ◽  
And Performance ◽  
Main Components

For supercritical CO2, a small change in temperature or pressure can result in large change in density, especially in the state close to the critical point. The large change in density can easily induce the natural convective flow. In this chapter, a solar water heater using supercritical CO2 which is originally designed and constructed will be introduced. The solar water heater is a closed loop system with main components of an evacuated solar collector and a heat exchanger. The working fluid of CO2 is naturally driven by the large change in density with absorbing and transporting heat in the solar collector. And the heat energy (hot water) is produced by exchanging the transferred heat with water in the heat exchanger. This chapter will describe the typical system operation and performance at different season and climates.

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