scholarly journals MAXIMIZING PERFORMANCES OF A SOLAR DOMESTIC HOT WATER SYSTEM THROUGH OPTIMUM POSITION OF THE SOLAR COLLECTOR

2017 ◽  
Author(s):  
Jasmina Skerlić ◽  
◽  
Danijela Nikolić ◽  
Dubravka Živković ◽  
Jasna Radulović ◽  
...  
Keyword(s):  
Solar Collector ◽  
Water System ◽  
Hot Water ◽  
Domestic Hot Water ◽  
Optimum Position

A Simulation Model for Predicting the Performance of Solar Domestic Hot Water System

2012 ◽  
Vol 512-515 ◽  
pp. 230-233
Author(s):  
Le Minh Nhut ◽  
Youn Cheol Park
Keyword(s):  
Solar Collector ◽  
Storage Tank ◽  
Water System ◽  
Electricity Consumption ◽  
Hot Water ◽  
Initial Water ◽  
Heat Gain ◽  
Domestic Hot Water ◽  
Useful Heat Gain ◽  
Useful Heat

The article deals with the modeling and simulation aspects of the performance improvement of a solar domestic hot water system. A mathematical model of this system is carried out to predict its operating performance under specified weather conditions of Jeju Island, Korea. The optimum mass flow rate through collector based on the relationship between the useful heat gain of solar collector and the electricity consumption of solar pump is investigated. Besides, the effect of various parameters such as solar collector area, initial water temperature and volume of storage tank is analyzed. The result of the simulation shows that the optimum mass flow rate was determined at kg/s with the new coefficient . At this value, the amount of useful heat gain slightly decreased about 84.3 (Wh) corresponds to 0.16% but the amount of electricity consumption strongly decreased about 227.8 (Wh) corresponds to 48.8% compares with kg/s ( ) was proposed by . Furthermore, the system performance is affected strongly by the change of collector area, initial water temperature and volume of storage tank.

scholarly journals Design and Analysis of the Domestic Micro-Cogeneration Potential for an ORC System Adapted to a Solar Domestic Hot Water System

Entropy ◽  
2019 ◽  
Vol 21 (9) ◽  
pp. 911 ◽  
Author(s):  
Daniel Leal-Chavez ◽  
Ricardo Beltran-Chacon ◽  
Paola Cardenas-Terrazas ◽  
Saúl Islas ◽  
Nicolás Velázquez
Keyword(s):  
Solar Collector ◽  
Electric Energy ◽  
Water System ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Point Of View ◽  
Hot Water ◽  
Working Fluid ◽  
Condensation Temperature ◽  
Domestic Hot Water

This paper proposes the configuration of an Organic Rankine Cycle (ORC) coupled to a solar domestic hot water system (SDHWS) with the purpose of analyzing the cogeneration capacity of the system. A simulation of the SDHWS was conducted at different temperatures, observing its performance to determine the amounts of useable heat generated by the solar collector; thus, from an energy balance point of view, the amount of heat that may be used by the ORC could be determined. The working fluid that would be suitable for the temperatures and pressures in the system was selected. The best fluid for the given conditions of superheated vapor at 120 °C and 604 kPa and a condensation temperature of 60 °C and 115 kPa was acetone. The main parameters for the expander thermodynamic design that may be used by the ORC were obtained, with the possibility of generating 443 kWh of annual electric energy with 6.65% global efficiency of solar to electric power, or an overall efficiency of the cogeneration system of 56.35% with a solar collector of 2.84 m2.

scholarly journals Design and Analysis of Domestic Micro-Cogeneration Potential for an ORC System Adapted to a Solar Domestic Hot Water System

2019 ◽  
Author(s):  
Daniel Leal-Chavez ◽  
Ricardo Beltran-Chacon ◽  
Paola Cardenas-Terrazas ◽  
Saul Islas ◽  
Nicolas Velazquez
Keyword(s):  
Solar Collector ◽  
Electric Energy ◽  
Water System ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Hot Water ◽  
Working Fluid ◽  
Condensation Temperature ◽  
Domestic Hot Water ◽  
Cogeneration System

This paper proposes the configuration of an Organic Rankine Cycle (ORC) coupled to a solar domestic hot water system (SDHWS), with the purpose of analyzing the cogeneration capacity of the system. A simulation of the SDHWS was conducted at different temperatures, observing its performance to determine the amounts of useable heat generated by the solar collector; thus, from an energy balance, the amount of heat that may be used by the ORC could be determined. The working fluid that would be suitable for the temperatures and pressures given in the system were selected. The best fluid for the given conditions of superheated vapor at 120 °C and 604 kPa and a condensation temperature of 60 °C and 115 kPa was acetone. The main parameters for the expander thermodynamic design that may be used in such ORC were obtained with the possibility of generating 443 kWh of annual electric energy, with 6.65 % global efficiency of solar to electric power, or an overall efficiency of the cogeneration system of 56.35 % with a solar collector of 2.84 m2.

scholarly journals Investigation and Modelling of the Centralized Solar Domestic Hot Water System in Residential Buildings

2016 ◽  
Vol 146 ◽  
pp. 424-430 ◽  
Author(s):  
Rui Yu ◽  
Da Yan ◽  
Xiaohang Feng ◽  
Yan Gao
Keyword(s):  
Residential Buildings ◽  
Water System ◽  
Hot Water ◽  
Domestic Hot Water

Simulation of a combined heating, cooling and domestic hot water system based on ground source absorption heat pump

2014 ◽  
Vol 126 ◽  
pp. 113-122 ◽  
Author(s):  
Wei Wu ◽  
Tian You ◽  
Baolong Wang ◽  
Wenxing Shi ◽  
Xianting Li
Keyword(s):  
Heat Pump ◽  
Water System ◽  
Hot Water ◽  
Absorption Heat Pump ◽  
Domestic Hot Water ◽  
Ground Source

scholarly journals Analysis and Adaptation of Q-Learning Algorithm to Expert Controls of a Solar Domestic Hot Water System

2019 ◽  
Vol 2 (2) ◽  
pp. 15 ◽  
Author(s):  
Bettoni ◽  
Soppelsa ◽  
Fedrizzi ◽  
del Toro Matamoros
Keyword(s):  
Control Algorithm ◽  
Fuzzy Controller ◽  
Learning Algorithm ◽  
Water System ◽  
Hot Water ◽  
Reference Case ◽  
Domestic Hot Water ◽  
Q Learning ◽  
Performance Factor ◽  
Seasonal Performance

This paper discusses the development of a coupled Q-learning/fuzzy control algorithm to be applied to the control of solar domestic hot water systems. The controller brings the benefit of showing performance in line with the best reference controllers without the need for devoting time to modelling and simulations to tune its parameters before deployment. The performance of the proposed control algorithm was analysed in detail concerning the input membership function defining the fuzzy controller. The algorithm was compared to four standard reference control cases using three performance figures: the seasonal performance factor of the solar collectors, the seasonal performance factor of the system and the number of on/off cycles of the primary circulator. The work shows that the reinforced learning controller can find the best performing fuzzy controller within a family of controllers. It also shows how to increase the speed of the learning process by loading the controller with partial pre-existing information. The new controller performed significantly better than the best reference case with regard to the collectors’ performance factor (between 15% and 115%), and at the same time, to the number of on/off cycles of the primary circulator (1.2 per day down from 30 per day). Regarding the domestic hot water performance factor, the new controller performed about 11% worse than the best reference controller but greatly improved its on/off cycle figure (425 from 11,046). The decrease in performance was due to the choice of reward function, which was not selected for that purpose and it was blind to some of the factors influencing the system performance factor.

Research at the Building Research Establishment into the applications of solar collectors for space and water heating in buildings

1980 ◽  
Vol 295 (1414) ◽  
pp. 403-414
Keyword(s):  
Solar Collector ◽  
Water System ◽  
Cost Effective ◽  
Heating System ◽  
Field Studies ◽  
Hot Water ◽  
Solar Collectors ◽  
Water Heating ◽  
Actual Performance ◽  
Low Efficiency

A completed study of a solar hot water heating system installed in a school showed an annual average efficiency of 15%, the low efficiency largely caused by the unfavourable pattern of use in schools. Field studies, in 80 existing and 12 new houses, of a simple domestic hot water system have been initiated to ascertain the influence of the occupants on the actual performance of solar collector systems. The development of testing methods of solar collectors and solar water heating systems is being undertaken in close collaboration with the B.S.I. and the E.E.C. Solar space heating is being investigated in two experimental low energy house laboratories, one using conventional solar collectors with interseasonal heat storage and the other a heat pump with an air solar collector. Studies of the cost-effectiveness of solar collector applications to buildings in the U.K. show that they are far less cost-effective than other means of conserving energy in buildings.

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