A study on heat storage sizing and flow control for a domestic scale solar-powered organic Rankine cycle-vapour compression refrigeration system

Kutlu, Çağrı; Erdinç, Mehmet Tahir; Li, Jing; Wang, Yübo; Su, Yuehong

doi:10.1016/j.renene.2019.05.017

Cited by 34 publications

(17 citation statements)

References 33 publications

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“…The refrigeration system has four components: compressor, condenser, capillary tube and evaporator. The following assumptions are considered for refrigeration simulation (Kutlu et al 2019):…”

Section: Sub-model For Refrigeration Cyclementioning

confidence: 99%

Performance Analysis of a PV Powered Variable Speed DC Fridge Integrated with PCM for Weak/Off-Grid Setting Areas

Riffat

Kutlu

Brito

et al. 2021

Future Cities and Environment

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This paper investigates the transient performance of a DC compressor fridge incorporated with Phase Change Material (PCM) for weak/off-grid setting regions. A photovoltaics (PV) module is directly connected to the DC compressor without use of batteries and inverter, in order to simplify the system and reduce its cost. The DC compressor speed can be adjusted according to the radiation intensity for an optimum match between PV output and the efficiency of refrigeration. During the daytime, the PCM is charged for cold storage by refrigeration; when solar radiation is weak or during the night, the PCM releases cooling to maintain the required cabinet temperature. A transient mathematical model is built for the whole system including PV module, DC compressor refrigeration system, fridge cabinet and PCM packs. The model is coded and solved in MATLAB while CFD method is used to produce some additional information. The simulations are conducted to evaluate the effect of solar radiation intensity, thermostat setting and the number of PCM packs on the fridge refrigeration performance. Moreover, the study aims to investigate and present benefits of incorporating PCM with a direct PV powered DC compressor fridge in weak/off-grid setting areas. When the fridge cabinet temperature varies between 4℃ and -2℃, the average COP of the fridge refrigeration system was found 1.7 for high solar radiation day due to the high rotation speed of the compressor, but for low solar radiation day, the average COP was calculated as 1.95. The analysis also shows that a variable speed DC compressor can keep the foods in the desired temperature range for two days of power outage by using 1 m 2 PV module and 3.6 kg of thin PCM packs.

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Section: Sub-model For Refrigeration Cyclementioning

confidence: 99%

Performance Analysis of a PV Powered Variable Speed DC Fridge Integrated with PCM for Weak/Off-Grid Setting Areas

Riffat

Kutlu

Brito

et al. 2021

Future Cities and Environment

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“…This concept can be simplified using the same working fluid and condenser for both cycles. Such a solar ORC-VCC system was proposed [26] with an expander, compressor, and generator on the same shaft so that electricity or cooling loads can be preferred. Additionally, in winter, the condenser heat can be used for heating in a heat pump regime.…”

Section: Separate Thermodynamic Cycles Coupled By Workmentioning

confidence: 99%

“…Other researchers considered similar systems with combined condensers but without the generator and electricity output [27] with a piston expander-compressor unit (COP between 0.1 and 0.6, based on the heat source temperature and working fluid) or an ORC heat pump [14]. For a more detailed summary of ORC-VCC systems, the reader is referred a previous report [26].…”

Section: Separate Thermodynamic Cycles Coupled By Workmentioning

confidence: 99%

Absorption Power and Cooling Combined Cycle with an Aqueous Salt Solution as a Working Fluid and a Technically Feasible Configuration

Novotny¹,

Szucs²,

Spale³

et al. 2021

Preprint

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Combined systems for power production and thermally activated cooling have a high potential for improving the efficiency and utilisation of thermal systems. In this regard, various configurations have been proposed and are comprehensively reviewed. They are primarily based on absorption systems and the implementation of multiple levels of complexity and flexibility. The configuration of the absorption power and cooling combined cycle proposed herein has wide commercial applicability owing to its simplicity. The configuration of the components is not new. However, the utilisation of aqueous salt solutions, the comparison with ammonia chiller and with absorption power cycles, the focus on parameters that are important for real-life applications, and the comparison of the performances for constant heat input and waste heat recovery are novel. The proposed cycle is also compared with a system based on the organic Rankine cycle and vapour compression cycle. An investigation of its performance proves that the system is suitable for a given range of boundary conditions from a thermodynamic standpoint, as well as in terms of system complexity and technical feasibility. New possibilities with regard to added power production have the potential to improve the economics and promote the use of absorption chiller systems.

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“…By solving all the energy balance equations simultaneously, temperature distribution inside the tank can be determined. These methodology have been already used in previous studies [35], [36]. When there is a coil placed in a tank, energy balance equation changes for including its effect and conduction heat transfer between water nodes become more important [37].…”

Section: Cylindrical Water Tankmentioning

confidence: 99%

A simulation study on performance improvement of solar assisted heat pump hot water system by novel controllable crystallization of supercooled PCMs

et al. 2020

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Domestic hot water (DHW) has a significant share in building's energy consumption. In order to reduce this consumption, various solutions have been proposed such as controlling the system in an efficient way, using renewable sources and using phase change materials (PCM) in the system to increase heat capacity. However, this study is not only offering heat capacity improvement of the DHW storage unit but also proposing that energy efficiency can be improved by controlling the heat releasing time of the PCM. In this study, supercooled PCM tubes are placed in a water tank and charged with a solar assisted heat pump unit, these supercooled PCM tubes can then be discharged anytime when the hot water is required. In this paper, a transient thermodynamic model is built for the whole system including solar collector, heat pump, water tank with PCM and DHW demand profile. System components are modelled and a 24 hours of demand profile is used in simulation for a UK home for summer and spring weather conditions. The results show that the PCM tubes effectively compensate the morning peak hot water demand and reduce daily energy consumption around 12.1% and 13.5% by shifting heating provision from immersion heater to solar heat pump.

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A study on heat storage sizing and flow control for a domestic scale solar-powered organic Rankine cycle-vapour compression refrigeration system

Cited by 34 publications

References 33 publications

Performance Analysis of a PV Powered Variable Speed DC Fridge Integrated with PCM for Weak/Off-Grid Setting Areas

Performance Analysis of a PV Powered Variable Speed DC Fridge Integrated with PCM for Weak/Off-Grid Setting Areas

Absorption Power and Cooling Combined Cycle with an Aqueous Salt Solution as a Working Fluid and a Technically Feasible Configuration

A simulation study on performance improvement of solar assisted heat pump hot water system by novel controllable crystallization of supercooled PCMs

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