Energy analysis and modeling of a solar assisted house heating system with a heat pump and an underground energy storage tank

Yumrutaş, Recep; Ünsal, Mazhar

doi:10.1016/j.solener.2012.01.008

Cited by 70 publications

(37 citation statements)

References 24 publications

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“…In other word, if the stored heat in the storage was less than the heat demand, this extra demand was covered by heat pump support (Q HP ); see Eq. (3) Yumrutas and Unsal, 2012.…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, a higher coefficient of performance (COP) of the heat pump is a result of a stratified tank because the temperature supplied to the evaporator of the heat pump from the top layer of the stratified tank is higher than that of a mixed tank. Yumrutas and Unsal (2012) developed an analytical and computational model to investigate the influence that the earth type, year of operation, Carnot efficiency of the heat pump and collector and storage sizes have on the COP of heat pumps and storage temperature in hot water tank seasonal storage. Their results showed that using a larger collector area and greater storage volume increased the COP of heat pumps, especially after the fifth year of operation.…”

Section: Introductionmentioning

confidence: 99%

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Low-temperature heat emission combined with seasonal thermal storage and heat pump

2015

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We studied the application of a stratified seasonal hot water storage tank with a heat pump connected to medium-, low-and very-low-temperature space heat emissions for a single-family house in Stockholm, Sweden. Our aim was to investigate the influence of heat emission design temperature on the efficiency and design parameters of seasonal storage in terms of collector area, the ratio of storage volume to collector area (RVA), and the ratio of height to diameter of storage tank. For this purpose, we developed a mathematical model in MATLAB to predict hourly heat demand in the building, heat loss from the storage tank, solar collector heat production, and heat support by heat pump as a backup system when needed. In total, 108 cases were simulated with RVAs that ranged ), and various heat emissions with design supply/return temperatures of 35/30 as very-low-, 45/35 as low-, and 55/45 (°C) as medium-temperature heat emission. In order to find the best combination based on heat emission, we considered the efficiency of the system in terms of the heat pump work considering coefficient of performance (COP) of the heat pump and solar fraction. Our results showed that, for all types of heat emission a storage-volume-to-collector area ratio of 5 m 3 m À2 , with a collector area of 50 m 2 , and a height-to-diameter ratio of 1.0 m m À1 were needed in order to provide the maximum efficiency. Results indicated that for very-low-temperature heat emission the heat pump work was less than half of that of the medium-temperature heat emission. This was due to 7% higher solar fraction and 14% higher COP of heat pump connected to very-low-temperature heat emission compared to medium-temperature heat emission.

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“…In other word, if the stored heat in the storage was less than the heat demand, this extra demand was covered by heat pump support (Q HP ); see Eq. (3) Yumrutas and Unsal, 2012.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-temperature heat emission combined with seasonal thermal storage and heat pump

2015

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“…Combining a heat pump with seasonal thermal energy storage (STES-HP) had many advantages [57] for both large and small applications. In this study, a full range of single to multi-family houses was covered.…”

Section: Combination Of Seasonal Thermal Energy Storage and Heat Pumpmentioning

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

197

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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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“…Through heat transfer mediums such as water, active solar houses often work with other energy application systems. Yumrutas and Ünsal [5] studied how an active solar house cooperated with a heat pump and an underground energy storage system, and the longtime performance was simulated by the proposed model. Active solar houses with photovoltaic modules are a common manner of solar energy utilization in buildings, and the photovoltaic module can provide electrical demand not only for lighting and other indoor power equipment but also for the delivery fans or pumps in an active solar house to lower building energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Optimized Design and Feasibility of a Heating System with Energy Storage by Pebble Bed in a Solar Attic

2017

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For efficient application of solar energy, a pebble bed energy storage heating system in a solar attic is optimally designed and operated. To study the characteristics of the heating system, a numerical model for the system is presented and is validated with the experiment data in the literature. Based on the model, the influence of the envelopes of the solar house and the meteorological condition on the system performance is investigated. The results show that the envelopes, except those on the north face, with more glazed exterior surfaces can be beneficial to raise the temperature of the solar house. It is also found that outdoor temperature may have less impact on the energy storage in the system compared with solar radiation. Furthermore, through optimizing the system design and operation, solar energy can account for 56% of the energy requirement in the heating season in Xi'an (about 34 • N, 108 • E), which has an average altitude of 397.5 m and moderate solar irradiation. Also, the suitability of the system in northwest China is investigated, and the outcome demonstrates that the external comprehensive temperature should be more than 269 K if a 50% energy saving rate is expected.

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Energy analysis and modeling of a solar assisted house heating system with a heat pump and an underground energy storage tank

Cited by 70 publications

References 24 publications

Low-temperature heat emission combined with seasonal thermal storage and heat pump

Low-temperature heat emission combined with seasonal thermal storage and heat pump

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

Optimized Design and Feasibility of a Heating System with Energy Storage by Pebble Bed in a Solar Attic

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