Analysis of solar aided heat pump systems with seasonal thermal energy storage in surface tanks

Yumrutaş, Recep; Ünsal, Mazhar

doi:10.1016/s0360-5442(00)00032-3

Cited by 84 publications

(48 citation statements)

References 5 publications

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“…In addition, increasing the collector area would increase the average storage temperature [62] which acts as a source for the heat pump. Therefore, increasing collector area favours the heat pump in terms of higher COP [124]. Based on the results of previous studies given in Table 4, correlation between storage volume, collector area, COP and SF is shown in Figs.…”

Section: Discussionmentioning

confidence: 70%

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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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Section: Discussionmentioning

confidence: 70%

“…Therefore, increasing storage volume improved the COP of the heat pump by reducing the compressor work [123]. However, when the storage volume was large enough, then the effect of volume on COP of the heat pump became negligible [124].…”

Section: Discussionmentioning

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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“…The initial temperature in the surrounding soil is computed according to (9). The temperature boundary condition at the soil surface AC is described as (18).…”

Section: Temperature Stratification Methodmentioning

confidence: 99%

“…Yumrutas and Unsal [8,9] have made computational researches on the hemispherical water tank in earth. Flows and thermal stratifications in the water tank are omitted and the temperature is assumed to be uniform in the water tank.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis and Application of Three Different Computational Methods for Solar Heating System with Seasonal Water Tank Heat Storage

Sun

Ding³

2013

Advances in Mechanical Engineering

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We analyze and compare three different computational methods for a solar heating system with seasonal water tank heat storage (SHS-SWTHS). These methods are accurate numerical method, temperature stratification method, and uniform temperature method. The accurate numerical method can accurately predict the performance of the system, but it takes about 4 to 5 weeks, which is too long and hard for the performance analysis of this system. The temperature stratification method obtains relatively accurate computation results and takes a relatively short computation time, which is about 2 to 3 hours. Therefore, this method is most suitable for the performance analysis of this system. The deviation of the computational results of the uniform temperature method is great, and the time consumed is similar to that of the temperature stratification method. Therefore, this method is not recommended herein. Based on the above analyses, the temperature stratification method is applied to analyze the influence of the embedded depth of water tank, the thickness of thermal insulation material, and the collection area on the performance of this system. The results will provide a design basis for the related demonstration projects.

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“…The energy exchange between the heat pump and chiller unit and the ground will improve the performance of cooling and heating systems. The ground is considered as large energy storage medium with large mass and stable temperature [11]. Therefore, the TES tank is very important for stored rejected energy from the cooling system of the ice rink, and also TES will be utilized as a heat sink of the chiller unit in operating time.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis for Ice Rink Cooling and Building Heating Systems with Underground Storage Tank

2017

May 22-24, 2017 Kuala Lumpur (Malaysia) Back ICLTET-2017, ACBES-2017

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Abstract-In this study, the long-term performance of two thermal systems with the spherical underground thermal energy storage (TES) tank is investigated. The thermal systems are an ice rink cooling system, and ice rink cooling and house heating system with the TES tank, which consist of an ice rink, a chiller unit, a house to be heated, a heat pump and spherical underground TES tank. Two analytical models for the systems are developed for finding the thermal performance of the cooling and heating systems. The models are based on the solution of transient heat transfer problem outside the TES tank, energy requirements of the ice rink, chiller unit, heat pump and house. The solution of the problem is obtained using a similarity transformation and Duhamel superposition techniques. Analytical expressions for heat gain or loss of the ice rink, and for energy needs of the chiller unit, heat pump and house are derived as a function of inside design air, ambient air and water temperature in the TES tank. Analytical models are consisted of by combining of the solution equation and expressions for the each component of the thermal systems.Interactive computer programs in Matlab based on the analytical models are prepared for finding an hourly variation of water temperatures in the TES tank, coefficients of performance (COP) of the chiller and heat pump, and timespan required to attain annually periodic operating conditions. Results indicate that COP of the chiller and heat pump, and operation time of span changes between 2-5 and 4-7, and 6-7 years respectively.

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Analysis of solar aided heat pump systems with seasonal thermal energy storage in surface tanks

Cited by 84 publications

References 5 publications

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

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

Performance Analysis and Application of Three Different Computational Methods for Solar Heating System with Seasonal Water Tank Heat Storage

Thermal Analysis for Ice Rink Cooling and Building Heating Systems with Underground Storage Tank

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