Overview on Solar Thermal Plus Heat Pump Systems and Review of Monitoring Results

Sparber, Wolfram; Vajen, Klaus; Fedrizzi, Roberto; D’Antoni, Matteo; Herkel, Sebastian; Ruschenburg, Jörn; Thuer, A

doi:10.18086/swc.2011.26.17

Cited by 11 publications

(12 citation statements)

References 6 publications

(8 reference statements)

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“…These systems lead to changed SPF of the overall system and to a reduced consumption of electrical energy [3]. In most cases, reduction of electrical energy consumption depends on the chosen operational strategy [4].…”

Section: Literature Reviewmentioning

confidence: 99%

“…This classification could be found in IEA task papers [3]. When connected to the cold side of the heat pump, solar collectors increase source temperature and regenerate borehole when the heat pump is not operating.…”

Section: Literature Reviewmentioning

confidence: 99%

“…In previous studies [3][4][5][6][7][8]14], the scenario of equal or higher DHW demand was not widely examined. During the spread of NZEB and Passive house concepts, this scenario appears realistic in Baltic countries too.…”

Section: Motivation Of Studymentioning

confidence: 99%

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Solar Assisted Ground Source Heat Pump Performance in Nearly Zero Energy Building in Baltic Countries

Januševičius¹,

Streckienė²

2013

Scientific Journal of Riga Technical University. Environmental and Climate Technologies

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Abstract-In near zero energy buildings (NZEB) built in Baltic countries, heat production systems meet the challenge of large share domestic hot water demand and high required heating capacity. Due to passive solar design, cooling demand in residential buildings also needs an assessment and solution. Heat pump systems are a widespread solution to reduce energy use. A combination of heat pump and solar thermal collectors helps to meet standard requirements and increases the share of renewable energy use in total energy balance of country.The presented paper describes a simulation study of solar assisted heat pump systems carried out in TRNSYS. The purpose of this simulation was to investigate how the performance of a solar assisted heat pump combination varies in near zero energy building. Results of three systems were compared to autonomous (independent) systems simulated performance. Different solar assisted heat pump design solutions with serial and parallel solar thermal collector connections to the heat pump loop were modelled and a passive cooling possibility was assessed. Simulations were performed for three Baltic countries: Lithuania, Latvia and Estonia.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

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Solar Assisted Ground Source Heat Pump Performance in Nearly Zero Energy Building in Baltic Countries

Januševičius¹,

Streckienė²

2013

Scientific Journal of Riga Technical University. Environmental and Climate Technologies

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“…An overview on solar heat pump systems is presented in Ref. [2]. Garcia et al [3] present an optimal energy management system for standalone wind turbine/photovoltaic/hydrogen/batery hybrid based on fuzzy logic.…”

Section: Introductionmentioning

confidence: 99%

Fuzzy Logic Energy Management for a Residential Power System Using Renewable Energy Sources

Breban¹,

Gros²,

Marginean³

et al. 2017

Modern Fuzzy Control Systems and Its Applications

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A fuzzy logic energy management algorithm is proposed for a hybrid wind/photovoltaic (PV) power generation unit, an electric vehicle batery, and a heat pump for household applications. The proposed concept refers to two independent power systems-a light electric vehicle and a household that interact through light, interchangeable bateries; moreover, they are powered from a renewable energy system comprising PV panels, wind generator, and appropriate MPPT-based converters. The main features of the concept are the heat pump load that produces thermal energy, as the main electric load of the system, and the storage element that is alternately used by the vehicle, which can be recharged from renewable sources. The presented algorithm allows the implementation, by means of fuzzy tools, of an appropriate energy management control system in order to obtain maximum utilization of the renewable energy. The results show that most of the energy required to charge the batery and to feed the heat pump can be covered from renewable sources.

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“…Due to the use of renewable energies stored in air, ground or water, heat pumps typically use three to four times less electrical energy than direct electrical heaters to deliver the same amount of heat. There are different ways to combine heat pump with seasonal thermal energy storage and solar thermal collector, including parallel, serial, and parallel-serial configurations (Sparber et al, 2011). In parallel configuration, heat pump and solar collector (seasonal storage) work independently to meet the heat demand in building.…”

Section: Introductionmentioning

confidence: 99%

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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Overview on Solar Thermal Plus Heat Pump Systems and Review of Monitoring Results

Cited by 11 publications

References 6 publications

Solar Assisted Ground Source Heat Pump Performance in Nearly Zero Energy Building in Baltic Countries

Solar Assisted Ground Source Heat Pump Performance in Nearly Zero Energy Building in Baltic Countries

Fuzzy Logic Energy Management for a Residential Power System Using Renewable Energy Sources

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

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