Feasibility of active solar water heating systems with evacuated tube collector at different operational water temperatures

Mazarrón, Fernando R.; Porras-Prieto, Carlos Javier; García, José Luis; Benavente, Rosa María

doi:10.1016/j.enconman.2016.01.046

Cited by 63 publications

(21 citation statements)

References 31 publications

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“…Three types of stationary collectors are commonly used in DSWHS: flat plate collectors (FPCs), evacuated tube collectors (ETCs), and compound parabolic collectors (CPCs) [12]. Among them, ETCs are mostly utilized for small-scale water heating applications [13]. Previous reports mainly focused on performance evaluation and feasibility analysis of DSWHS [1,[14][15][16][17][18].…”

Section: Literature Review On Dswhsmentioning

confidence: 99%

Assessing the potential and benefits of domestic solar water heating system based on field survey

Niu

Hong

Qiang

et al. 2017

Env Prog and Sustain Energy

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Domestic solar water heating system (DSWHS) without auxiliary energy is widely used in loess hilly region of China. However, there is a lack of studies on DSWHS in this region. This article assessed the potential and benefits of DSWHS on the basis of field survey. Results indicate that a DSWHS with evacuated tube collectors (ETC DSWHS), with a collecting area of 2.09 m2 and an average thermal efficiency of 40%, can supply heat of 3661.7 MJ during its valid period of 263 d. A household with an average of 4.9 people consumes annually 11,043.5 kg of hot water supplied by DSWHS. A total of 1238.7 MJ of energy is needed to heat so much water. The actual thermal efficiency of DSWHS is only 13.53%. Clearly, there is a great potential to improve the energy efficiency of DSWHS. DSWHS has low economic benefit because of its low actual thermal efficiency. However, it has enormous environmental benefits and significant social impacts. The 1238.7‐MJ energy provided by it is equal to that provided by 211.6‐kg raw coal, which can emit 454.99‐kg CO2, 3193.79‐g SO2 during use. Rural residents are recommended to use more hot water supplied by DSWHS through increasing the frequency of bathing and cloth washing. The government should further promote DSWHS utilization by driving costs down. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1781–1791, 2018

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Section: Literature Review On Dswhsmentioning

confidence: 99%

Assessing the potential and benefits of domestic solar water heating system based on field survey

Niu

Hong

Qiang

et al. 2017

Env Prog and Sustain Energy

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“…The daily load pattern of hot tap water in production halls is not convergent to the supply of renewable energy from solar collectors [7]. How the research [7,8] shows the useful energy, and therefore the profitability, will decrease if the demand is not distributed throughout the day or focused on the end of the day. Therefore the assessment of the impact of the hot tap water load pattern in the industrial hall on the energy yield from solar collectors is important issue in terms of the energy efficiency.…”

Section: Figmentioning

confidence: 99%

The impact of the hot tap water load pattern in the industrial hall on the energy yield from solar collectors

Fidorów-Kaprawy

Dudkiewicz

2017

E3S Web Conf.

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Abstract. The systems using solar energy, popular in Poland, can be used to supply hot water for the installation used by employees of industrial halls. In manufacturing plants, employing a large number of people, the demand for hot water is practically constant throughout the year and is characterized by periodic use at the end of each work shift. Dynamics of the hot water consumption depends on the number of shifts as well as working days and holidays. Additionally the maximum hot tap water demand occurs in the whole period of installation operation. In polish climatic conditions the solar collectors' systems have the largest capacity in the summer, while in winter they need to be assisted. Beside that the supply of renewable energy is uneven and depends on weather conditions. In the paper the one-hour step analysis concerning the dependence of the load pattern of the hot tap water preparation system on the energy yield from solar collectors had been performed.

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“…However, given that the objective is to calculate profitability, attention will focus on the useful energy. As in other studies [14], the energy delivered to the tank is considered useful energy of the SWH, as the complementary delivery system would harness this energy, increasing the temperature of the water if 60 • C are not reached:…”

Section: Useful Energymentioning

confidence: 99%

Profitability Variations of a Solar System with an Evacuated Tube Collector According to Schedules and Frequency of Hot Water Demand

et al. 2016

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Abstract:The use of solar water heating systems with evacuated tube collectors has been experiencing a rapid growth in recent years. Times when there is demand for hot water, the days of use and the volumes demanded may determine the profitability of these systems, even within the same city. Therefore, this paper characterizes the behavior of a solar system with active circulation with the objective of determining the profitability variations according to the timing and schedule of demand. Through a simplified methodology based on regression equations, calculated for each hour of the day based on data from an experimental facility, the useful energy is estimated from the time and frequency of the demand for hot water at 60 • C. The analysis of the potential profitability of the system in more than 1000 scenarios analyzed shows huge differences depending on the number of days when the water is demanded, the time when demand occurs, the irradiation and the average price of energy. In cities with high irradiation and high energy prices, the system could be profitable even in homes where it is used only on weekends. The study of profitability in a building of 10 homes shows that by applying an average European household's profile for hot water demand, levels close to full potential would be reached; for this, it is necessary to optimize the collection surface.

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Feasibility of active solar water heating systems with evacuated tube collector at different operational water temperatures

Cited by 63 publications

References 31 publications

Assessing the potential and benefits of domestic solar water heating system based on field survey

Assessing the potential and benefits of domestic solar water heating system based on field survey

The impact of the hot tap water load pattern in the industrial hall on the energy yield from solar collectors

Profitability Variations of a Solar System with an Evacuated Tube Collector According to Schedules and Frequency of Hot Water Demand

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