Unglazed PVT collectors as additional heat source in heat pump systems with borehole heat exchanger

Bertram, Erik; Glembin, Jens; Rockendorf, Gunter

doi:10.1016/j.egypro.2012.11.049

Cited by 50 publications

(14 citation statements)

References 6 publications

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“…The performance of PV/T systems are often compared to PV and solar thermal systems, or only PV systems [26][27][28][29][30]. The combination of PV/T modules and ground source heat pumps are compared to systems with only ground source heat pumps, direct grid electricity, or ground source heat pumps and other solar technologies [31][32][33][34][35]. Comparative analyses are also used to evaluate the environmental impact of PV/T modules, where they are compared to PV modules, direct use of grid electricity, or gas boilers [36][37][38][39].…”

Section: Comparative Analysismentioning

confidence: 99%

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Embodied greenhouse gas emissions from PV systems in Norwegian residential Zero Emission Pilot Buildings

et al. 2016

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Printed by NTNU Grafisk senter i This thesis concerns the use of solar energy in energy efficient buildings. More precisely, the topic is photovoltaic-thermal (PV/T) solar energy systems, and how these can be used to provide renewable energy in zero emission buildings. PV/T modules are a hybrid between photovoltaic (PV) modules and solar thermal collectors, and therefore generate electricity and thermal energy simultaneously. The objective of the thesis was to investigate the potential of PV/T systems to minimize the life cycle greenhouse gas emissions of a residential building.The building sector accounts for around one third of the global energy use and about half of the electricity use, and is therefore a key area to focus on in the effort to mitigate climate change and to create more sustainable societies in the future. The environmental impact of buildings need to be lowered by reducing the energy demand during construction and operation, but also by replacing polluting energy sources with renewable ones. The European Union has demanded of its member states that all new buildings shall be nearly zero energy buildings by 2020.Solar energy is well-suited to use in buildings, and can supply electricity, lighting, heating, and cooling. Once installed, a solar energy system supplies energy without pollution, is silent, have few or no moving parts, and can also be integrated into the building itself. In order to do investigate how PV/T systems can best be used in buildings to minimize life cycle emissions, the systems have been studied both in terms of energy performance and in terms of greenhouse gas emissions.The main research method in this thesis has been simulation of solar energy systems in buildings. Using simulations, PV/T systems have been compared to other solar energy systems with separate PV modules and solar thermal collectors. The simulation studies were performed in the simulation programs Polysun and PVsyst, and were based on commercial solar energy products available on the current market. The use of heat pumps, air-source and ground-source, in combination with solar energy systems was also studied.Two case buildings, the ZEB residential concept and the Living Lab, have been used in the simulation studies. The buildings are two of the pilot buildings of the Norwegian Research Centre for Zero Emission Buildings (the ZEB Centre). Both buildings are single family residential buildings located in Central or Southern Norway, and are designed to meet the Norwegian passive house requirements.The embodied emissions of the solar energy systems were determined using elements of life cycle assessments (LCA). A review of previous research found few studies of the environmental impact of PV/T modules, especially using industrially produced modules. The embodied emissions of such a PV/T module was therefore determined in this thesis, based on a combination of data from databases and information from module producers. The embodied emissions of the case buildings and the other solar energy systems studied were d...

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Section: Comparative Analysismentioning

confidence: 99%

“…Bertram, et al [32] combined simulations in TRNSYS with measurements over two years on a 39 m 2 unglazed PV/T system in Frankfurt am Main, Germany. The results showed an annual temperature increase of 3K, which led to a 9% lower electricity consumption due to a higher efficiency of the heat pump.…”

Section: Pv/t and Ground Source Heat Pump Systemsmentioning

confidence: 99%

Embodied greenhouse gas emissions from PV systems in Norwegian residential Zero Emission Pilot Buildings

et al. 2016

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“…by solar collector, or exhaust air from the ventilation system [31]. The temperature of DTES [32] ranges from 2 to 20 1C and from À 3 to 6 1C for charged and un-charged storage, respectively. Due to its low stored temperature, this system is usually combined with a heat pump.…”

Section: Duct Thermal Energy Storage (Dtes)mentioning

confidence: 99%

Seasonal thermal energy storage with heat pumps and low temperatures in building projects—A comparative review

Hesaraki

Holmberg

Haghighat

2015

Renewable and Sustainable Energy Reviews

206

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a b s t r a c tApplication of seasonal thermal energy storage with heat pumps for heating and cooling buildings has received much consideration in recent decades, as it can help to cover gaps between energy availability and demand, e.g. from summer to winter. This has the potential to reduce the large proportion of energy consumed by buildings, especially in colder climate countries. The problem with seasonal storage, however, is heat loss. This can be reduced by low-temperature storage but a heat pump is then recommended to adjust temperatures as needed by buildings in use. The aim of this paper was to compare different seasonal thermal energy storage methods using a heat pump in terms of coefficient of performance (COP) of heat pump and solar fraction, and further, to investigate the relationship between those factors and the size of the system, i.e. collector area and storage volume based on past building projects including residences, offices and schools.

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“…The dynamic system simulations have been performed using the software TRNSYS [1]. The most important component models (types) which were used in these simulations are listed in Table 2.…”

Section: Simulation Modelsmentioning

confidence: 99%

“…In many of these systems, solar energy is not only used to charge a buffer storage (parallel system) but also as heat source for the evaporator of an HP. In some configurations, unglazed collectors are used as a heat source [1]. In the IEA SHC (International Energy Agency Solar Heating and Cooling Programme) Task 44 (www.iea-shc.org/task44), the performance and relevance of combined systems using solar thermal and heat pumps are evaluated, a common definition of the performance of such systems and contributions to a successful market penetration of this new promising combination of renewable technologies are provided [2].…”

Section: Introduction mentioning

confidence: 99%

Efficiency of Combined Solar Thermal Heat Pump Systems

Lerch¹,

Heinz²,

Heimrath³

et al. 2015

JCEA

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Abstract:In this project, different combinations of solar energy and heat pump systems for preparation of DHW (domestic hot water) and space heating of buildings are analyzed through dynamic system simulations in TRNSYS (Transient System Simulation Program). In such systems, solar thermal energy can be used, on one hand, directly to charge the buffer storage and, on the other hand, as heat source for the evaporator of the HP (heat pump). In this work systems, in which solar heat is only used directly (parallel operation of solar and HP), systems using the collectors also as a heat source for the HP are analyzed and compared to conventional air HP systems. With a combined parallel solar thermal HP system, the system performance compared to a conventional HP system can be significantly increased. Unglazed selectively coated collectors as source for the HP have the advantage that the collector can be used as an air heat exchanger. If solar radiation is available and the collector is used as source for the HP, higher temperatures at the evaporator of the HP can be achieved than with a conventional air HP system.

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Unglazed PVT collectors as additional heat source in heat pump systems with borehole heat exchanger

Cited by 50 publications

References 6 publications

Embodied greenhouse gas emissions from PV systems in Norwegian residential Zero Emission Pilot Buildings

Embodied greenhouse gas emissions from PV systems in Norwegian residential Zero Emission Pilot Buildings

Seasonal thermal energy storage with heat pumps and low temperatures in building projects—A comparative review

Efficiency of Combined Solar Thermal Heat Pump Systems

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