Detailed analysis of the energy yield of systems with covered sheet-and-tube PVT collectors

Santbergen, Rudi; Rindt, Ccm Camilo; Zondag, H.A.; Zolingen, R.J.C. van

doi:10.1016/j.solener.2010.02.014

Cited by 112 publications

(52 citation statements)

References 12 publications

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“…The difference between the heat delivered by the PV/T collector and the heat extracted from the DHW-TST, either for consumption or due to thermal losses, is provided by the backup system which consumed 1251 kWh of electricity. Overall, the solar DHW system performed well, with average solar fraction values similar to those found in Santbergen et al (2010) and Silva and Fernandes (2010). However, low insolation forces the system to use backup power, which reduces the solar fraction considerably since the backup system uses a simple submersible electric heating element.…”

Section: System Model Resultsmentioning

confidence: 62%

“…The PV/T collectors also delivered 1618 kWh of thermal energy to the DHW-TST, operating at an average efficiency of 15%, a small figure compared to results presented by Santbergen et al (2010) which operated at 24.3%. DHW loads amounted to 2523 kWh, which differs from the optimal value predicted earlier -2811 kWh -because of high frequency demand during the mornings which degrades the temperature profile in stratified TSTs.…”

Section: System Model Resultsmentioning

confidence: 75%

“…This would prevent the DHW backup system from tampering with the thermal efficiency of the PV/T collectors by increasing the temperature of the water stored in the DHW-TST. This seems to be the strategy used in Santbergen et al (2010) which provided increased thermal efficiency. It should be mentioned that human health is paramount and as such, a solar DHW system must include a backup system, operating to meet local thermal demand, if necessary, as well as to prevent the growth of the Legionella bacteria.…”

Section: System Model Resultsmentioning

confidence: 99%

“…Thermal stratification is an effect that decisively influences the performance of solar collectors (Duffie et al ,2006;Santbergen et al, 2010). Thus, a TST model capable of mimicking stratification is required to properly evaluate the performance of solar collectors.…”

Section: Thermal Storage Tank Modelmentioning

confidence: 99%

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A PV/T and Heat Pump Based Trigeneration System Model for Residential Applications

Joyce¹,

Coelho²,

Martins³

et al. 2011

Proceedings of the ISES Solar World Congress 2011

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A solar trigeneration system, based on photovoltaic-thermal (PV/T) collectors, photovoltaic (PV) modules and a heat pump unit for heating and cooling, is modelled to forecast the thermal and electric yields of the system. The aim of the trigeneration system is to provide enough electricity, domestic hot water (DHW), heating and cooling power to meet the typical demand of an urban single family dwelling with limited roof area and allow the household to achieve a positive net energy status. The PV/T collectors and PV modules provide the electricity while the former also powers the DHW component of the trigeneration system. The heating and cooling components rely on a vapour compression cycle heat pump unit powered by electricity. In Fong et al. (2010), solar-powered electric compression refrigeration was found to have the most energy saving potential in subtropical climates. Thus, a heat pump based cooling system is a cost effective solution for residential applications in Lisbon, Portugal. Thus, according to the dwelling's location, construction details and energy demand patterns, the model computes the system's net results by comparing the dwelling demand with the trigeneration system supply. The paper presents a breakdown of the proposed trigeneration system model and describes each component briefly. Preliminary results produced by the model are presented and analysed in order to identify possible ways of improving the overall system performance. IntroductionA trigeneration system is capable of simultaneously generating electricity, heat and cooling power from a single power source. Such a system uses complementary processes to convert the by-products of the main energy conversion and obtain forms of energy which are in line with demand. For instance, a gas-powered turbine driving an electrical generator produces electrical energy and waste heat. The waste heat can be used to produce hot water and power an absorption chiller. The same concept can be applied in solar power plants. Solar radiation is harnessed and converted to heat used to power a turbine which then drives an electrical generator, producing electricity. Heat is an evident by-product of this conversion and can be used for the aforementioned trigeneration system. Also, solar collectors and photovoltaic modules can be used to harness solar energy and convert it to heat and electricity, respectively, which may be used to power several cooling technologies (Fong et al., 2010, Immovilli et al., 2008. The aim of this article is to demonstrate the potential of a solar trigeneration system for the residential sector by describing a model, the methodology that led to that model and analysing a set of preliminary results. Solar Trigeneration System for the residential sectorA turbine-based solar trigeneration system is not suitable for the residential sector due to, among other concerns, scale, size, power rating, initial cost and maintenance. Instead, a solar trigeneration system developed specifically for the residential sector can be envisaged b...

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Section: System Model Resultsmentioning

confidence: 62%

Section: System Model Resultsmentioning

confidence: 75%

Section: System Model Resultsmentioning

confidence: 99%

Section: Thermal Storage Tank Modelmentioning

confidence: 99%

See 2 more Smart Citations

A PV/T and Heat Pump Based Trigeneration System Model for Residential Applications

Joyce¹,

Coelho²,

Martins³

et al. 2011

Proceedings of the ISES Solar World Congress 2011

View full text Add to dashboard Cite

show abstract

“…On the other hand, the transient performance of solar collectors and thermal storage tanks was not ignored since their combined performance is known to be decisively influenced by transient dynamics [7]. The system model was developed according to the methodology presented in [6] which consists on having three submodels -climate, building and trigeneration system -with various types of interactions.…”

Section: System Modelmentioning

confidence: 99%

Solar Trigeneration System Model for Off-Grid Residential Applications

Magalhães

Martins

Joyce

et al. 2012

Technological Innovation for Value Creation

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Abstract.A solar trigeneration system for off-grid households, based on photovoltaic-thermal (PV/T) collectors, photovoltaic (PV) modules and a heat pump (HP), whose aim is to provide enough electricity, domestic hot water (DHW), heating and cooling power to meet the typical demand of an offgrid single family dwelling, is modeled to predict its performance, enable system sizing and evaluate the impact of different control and management strategies. The system integrates an autonomous photovoltaic system, a solar DHW system and a heating, ventilation and air-conditioning (HVAC) system. Thus, according to local climate data, construction elements, load profiles and storage dynamics, the model computes the system's net results using a simple supply and demand approach. Additionally, a design space methodology is used to evaluate system performance for different sizes and identify a feasible design region within which reliable and cost-effective system sizing is possible.

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Application of Al₂O₃/water nanofluid as the coolant in a new design of photovoltaic/thermal system: An experimental study

Zamen

Kahani

Rostami

et al. 2022

Energy Science & Engineering

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A new geometry of photovoltaic/thermal (PVT) system is introduced in this study, and the application of Al2O3/water nanofluid as the coolant on the electrical and thermal behavior of a solar system is experimentally evaluated. To intensify the thermal ability of the solar collector, a serpentine half‐pipe cooling system is designed and fabricated behind the solar panel for better cooling. The cells of the panel are assembly on a 3‐mm‐thick aluminum plate, and the Tedlar removes from the system to maximize the heat transfer in the cooling section. A special layer arrangement for the composite panel is used to minimize thermal resistance of the system. Different concentrations of nanofluid samples (0.05–0.5 wt.%) prepared. To increase the stability of prepared nanofluids, suitable surfactants are also used. Based on the obtained results, adding the nanoparticles to the pure water can remarkably raise the efficiency of the PVT apparatus. The best behavior of the solar collector is observed for 0.5 wt.% of nanofluid samples. 126.71% and 7.38% enhancement in terms of thermal and electrical efficiency can be gained by the application of nanofluid in the system compared with pure water, respectively. The best obtained value of the overall efficiency is around 93.73% for the studied system. The maximum temperature rise for water and nanofluid is around 5.5 and 9.1°C, respectively, which confirms the better cooling ability of PVT system by nanofluid compared with water.

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Detailed analysis of the energy yield of systems with covered sheet-and-tube PVT collectors

Cited by 112 publications

References 12 publications

A PV/T and Heat Pump Based Trigeneration System Model for Residential Applications

A PV/T and Heat Pump Based Trigeneration System Model for Residential Applications

Solar Trigeneration System Model for Off-Grid Residential Applications

Application of Al₂O₃/water nanofluid as the coolant in a new design of photovoltaic/thermal system: An experimental study

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Detailed analysis of the energy yield of systems with covered sheet-and-tube PVT collectors

Cited by 112 publications

References 12 publications

A PV/T and Heat Pump Based Trigeneration System Model for Residential Applications

A PV/T and Heat Pump Based Trigeneration System Model for Residential Applications

Solar Trigeneration System Model for Off-Grid Residential Applications

Application of Al2O3/water nanofluid as the coolant in a new design of photovoltaic/thermal system: An experimental study

Contact Info

Product

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Application of Al₂O₃/water nanofluid as the coolant in a new design of photovoltaic/thermal system: An experimental study