scholarly journals Energy Analysis of a Complementary Heating System Combining Solar Energy and Coal for a Rural Residential Building in Northwest China

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Xiaofei Zhen ◽  
Jinping Li ◽  
Yassir Idris Abdalla Osman ◽  
Rong Feng ◽  
Xuemin Zhang ◽  
...  
Keyword(s):  
Solar Energy ◽  
Thermal Efficiency ◽  
Residential Building ◽  
Heating System ◽  
Energy Utilization ◽  
Prototype Model ◽  
Dual Function ◽  
Solar Water Heater ◽  
Water Heater ◽  
Solar Water

In order to utilize solar energy to meet the heating demands of a rural residential building during the winter in the northwestern region of China, a hybrid heating system combining solar energy and coal was built. Multiple experiments to monitor its performance were conducted during the winter in 2014 and 2015. In this paper, we analyze the efficiency of the energy utilization of the system and describe a prototype model to determine the thermal efficiency of the coal stove in use. Multiple linear regression was adopted to present the dual function of multiple factors on the daily heat-collecting capacity of the solar water heater; the heat-loss coefficient of the storage tank was detected as well. The prototype model shows that the average thermal efficiency of the stove is 38%, which means that the energy input for the building is divided between the coal and solar energy, 39.5% and 60.5% energy, respectively. Additionally, the allocation of the radiation of solar energy projecting into the collecting area of the solar water heater was obtained which showed 49% loss with optics and 23% with the dissipation of heat, with only 28% being utilized effectively.

scholarly journals Performance Analysis Of Solar Water Heating System With Plate Collector Integrated Pcm Storage

2021 ◽  
Vol 3 (2) ◽  
pp. 143-149
Author(s):  
Andi Syahrinaldy Syahruddin ◽  
Jalaluddin Jalaluddin ◽  
Azwar Hayat
Keyword(s):  
Solar Energy ◽  
Fluid Dynamic ◽  
Heating System ◽  
Solar Water Heater ◽  
Absorber Plate ◽  
Water Heater ◽  
Solar Water ◽  
Fluent Software ◽  
Collector Efficiency ◽  
Solar Water Heating System

Availability of solar energy as a renewable energy source is very abundant and inexhaustible. Solar water heater is an equipment that utilizes solar energy as a source of energy. The thermal performance of a solar water heater system using absorber plate with phase change material (PCM) as thermal energy storage is presented in this study. Two design of solar water heater collectors with absorber plate variations, i.e. an absorber plate with PCM storage and absorber plate without PCM storage were investigated experimentally and numerically simulation. First, the material properties of paraffin wax as PCM storage was analized analyticaly. Every shape model of solar water heater systems were imported and simulated at three variations of constant solar radiation, i.e. 400  W/m2, 700 W/m2, and 1000 W/m2. The simulation using a computational fluid dynamic (CFD) fluent software. The results showed that the average collector efficiency between absorber plate with and without PCM storage is 70.98 % using experimental study and 67.73 % using numerical simulation study.

scholarly journals Riset Penggunaan Pemanas Air Tenaga Surya di Perhotelan Indonesia - Sebuah Kajian Literatur

2019 ◽  
Vol 1 (1) ◽  
pp. 17-23
Author(s):  
Samar Tan ◽  
Richard A.M Napitupulu
Keyword(s):  
Solar Energy ◽  
Thermal Energy ◽  
Heating System ◽  
Hot Water ◽  
Solar Thermal ◽  
Solar Water Heater ◽  
Solar Thermal Energy ◽  
Literature Study ◽  
Water Heater ◽  
Solar Water

Hospitality is a relatively large energy user in the tourism sector. The application of renewable energy in this field will certainly save energy and contribute to reduce the effect of global warming. An interesting application to study is the use of solar energy for preparing hot water in hotel. This study is a literature study that explored research articles on solar water heater, especially used in hospitality, that have been published. Studies on solar energy have always increased over the past five years, 66.2% of which were in the field of solar thermal energy, where 11.2% of solar thermal energy researches were related to the use of solar energy for the process of heating water. For the research originating from Indonesia, the figures are 48.7% and 6.6% respectively. There is no research on the use of solar water heater in Indonesia. Research on tourism in Indonesia itself tends to decline. A simple example of simulation about solar water heating system using TRNSYS 18 simulation program was presented to motivate researchers in this field.

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

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.

Research of Water Heater Automatic System

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.

scholarly journals Performance Study of a Cylindrical Parabolic Concentrating Solar Water Heater with Nail Type Twisted Tape inserts in the Copper Absorber Tube

2017 ◽  
Author(s):  
Amit K. Bhakta ◽  
Nitesh K. Panday ◽  
Shailenrda N. Singh
Keyword(s):  
Solar Energy ◽  
Thermal Performance ◽  
Water Flow Rate ◽  
Twisted Tape ◽  
Solar Water Heater ◽  
Performance Study ◽  
Water Heater ◽  
Solar Water ◽  
Pitch Ratio ◽  
Twist Pitch

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.

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.

scholarly journals Thermal efficiency and cost analysis of solar water heater made in Rwanda

2018 ◽  
Vol 37 (3) ◽  
pp. 1147-1161 ◽  
Author(s):  
Esdras Nshimyumuremyi ◽  
Wang Junqi
Keyword(s):  
Cost Analysis ◽  
Thermal Efficiency ◽  
Solar Water Heater ◽  
Water Heating ◽  
Water Heater ◽  
Solar Water Heating ◽  
Solar Water ◽  
Water Heaters ◽  
Solar Water Heaters ◽  
Made In

Solar water heating is a technology of capturing the energy from the sun's radiation for the purpose of raising the temperature of water from water supply temperature to the desired higher temperature depending on the use. There are many views and discussions on the questions of thermal efficiency of solar water heaters and their associated cost, especially different customers/users want to replace their existing conventional water heating energy by solar water heating systems. In this present paper, a deep investigation has been accomplished to determine thermal efficiency and cost analysis of solar water heater made in Rwanda. During manufacturing of solar water heater, the collector was the main part to emphasize on. The high efficiency of the system was achieved by replacing galvanized iron sheet by aluminum sheet slotted and black painted as an absorber plate. The ambient temperature and average solar radiation of the three sites where solar water heaters are installed were investigated. The used materials, specifications and sizing were discussed in this paper.

scholarly journals Theoretical and experimental investigation of the evacuated tube solar water heater system

2020 ◽  
Vol 24 (2 Part A) ◽  
pp. 795-808 ◽  
Author(s):  
Phrut Sakulchangsatjatai ◽  
Chaiwat Wannagosit ◽  
Niti Kammuang-Lue ◽  
Pradit Terdtoon
Keyword(s):  
Thermal Efficiency ◽  
Experimental Results ◽  
Experimental Result ◽  
Maximum Temperature ◽  
Solar Water Heater ◽  
Water Heater ◽  
Solar Water ◽  
Evacuated Tubes ◽  
Evacuated Tube ◽  
Theoretical Results

In this study, the evacuated tube solar water heater system using thermosyphon has been investigated experimentally as well as theoretically. Solar radiation and ambient temperature data from Chiang Mai province were used for the modelling system by explicit finite difference method. The effects of thermosyphon diameters and number of evacuated tubes on the net saving of solar water heater system were analyzed. The mathematical results showed that the optimal number of evacuated tubes and thermosyphon diameter occurs at eight evacuated tubes, which are 15.88 mm of evaporator diameter and 22.22 mm of condenser diameter under personal hygiene conditions. The solar water heater system at optimal parameters was constructed and tested for the system prototype. The theoretical results were validated by the experimental results. It was found that the theoretical results can be used to predict temperature, heat transfer rate, and thermal efficiency to show good agreement with the experimental results as well as previous research. The experimental and theoretical results showed that the maximum temperature for hot water was 65.25?C and 71.66?C, respectively. Moreover, the thermal efficiency of the system based on the theoretical result was 60.11%, with relative error being about 3.04% of the experimental result.

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