Integration of PCM in domestic hot water tanks: Optimization for shifting peak demand

Najafian, Arman; Haghighat, Fariborz; Moreau, Alain

doi:10.1016/j.enbuild.2015.05.036

Cited by 88 publications

(22 citation statements)

References 20 publications

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“…Nabavitabatabayi et al [16] numerically investigated the impact of integration of nano-particle PCMs on the thermal performance of a hot water tank and demonstrated that the integration of the enhanced PCMs to the hot water tank could shift the power demand to the off-peak for a longer period of time compared to pure PCMs due to the higher thermal conductivity and the enhanced heat transfer rate. The work by Nkwetta et al [17] and Najafian et al [18] disclosed a similar viewpoint as in [16] that the combination of PCMs with DHW tanks could enable to shift electrical energy consumption to off peak periods and consume less energy compared to the regular ones without PCMs, considering SAT (90%) and graphite (10%) composite as the PCM.…”

Section: Accepted Manuscriptmentioning

confidence: 79%

“…Mazman et al [27] carried out experimental tests on a solar DHW tank of 150 l combined with three different PCM compounds, i.e. mixtures of paraffin and stearic acid (PS), paraffin and palmitic acid (PP), and stearic acid and myristic acid (SM) capsulated in a cylinder module at the top of the tank (similar to the PCM geometry used in [17,18]). They concluded that PS gave the best results for thermal performance enhancement of the solar DHW tank with an efficiency of 74%.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Thermal performance assessment and improvement of a solar domestic hot water tank with PCM in the mantle

Deng

Furbo

Kong

et al. 2018

Energy and Buildings

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Section: Accepted Manuscriptmentioning

confidence: 79%

Section: Accepted Manuscriptmentioning

confidence: 99%

Thermal performance assessment and improvement of a solar domestic hot water tank with PCM in the mantle

Deng

Furbo

Kong

et al. 2018

Energy and Buildings

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“…Phase change materials (PCM) can be used to improve the volumetric storage capacity of a thermal energy storage compared to a sensible heat storage by utilizing the latent heat of fusion [1][2][3]. Sodium acetate trihydrate (SAT) is an incongruently melting salt hydrate with a latent heat of fusion of 264 kJ/kg at the melting point of 58°C [4].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on cylindrical latent heat storage units with sodium acetate trihydrate composites utilizing supercooling

2016

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h i g h l i g h t sThermal energy storage units with supercooled of sodium acetate trihydrate are characterized. Heat exchange capacity rates were lower for units with PCM with thickening agents. Phase separation of sodium acetate trihydrate was avoided by thickening agent. a b s t r a c t Latent heat storage units utilizing stable supercooling of sodium acetate trihydrate (SAT) composites were tested in a laboratory. The stainless steel units were 1.5 m high cylinders with internal heat exchangers of tubes with fins. One unit was tested with 116 kg SAT with 6% extra water. Another unit was tested with 116.3 kg SAT with 0.5% Xanthan rubber as a thickening agent and 4.4% graphite powder. The heat exchange capacity rate during charge was significantly lower for the unit with SAT and Xanthan rubber compared to the unit with SAT and extra water. This was due to less convection in the thickened phase change material after melting. The heat content in the fully charged state and the heat released after solidification of the supercooled SAT mixtures at ambient temperature was higher for the unit with the thickened SAT mixture. The heat discharged after solidification of the supercooled SAT with extra water decreased over repeating charge and discharge cycles while the heat discharged from the SAT with Xanthan rubber remained stable. In both units, the solidification started spontaneously in the majority of the test cycles. This was due to the design of the unit or the method for handling the expansion and contraction of the SAT during charge and discharge.

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“…Najafian et al have tested an integration of PCM in domestic water tank which is electrically heated instead of solar [4]. For providing hot water during the whole day, the pure water tank has to be heated twice a day, contrary to the PCM-water tank which requires heating only once, resulting to a lower daily electrical energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Evaluating a prototype compact thermal energy storage tank using paraffin-based phase change material for domestic hot water production

et al. 2019

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A full-scale thermal energy storage system using phase change materials (PCM) is experimentally investigated for solar and geothermal applications. The system consists of a rectangular tank filled with PCM and a staggered fin tube heat exchanger (HE). The system is designed for the production of Domestic Hot Water (DHW) based on the EU Commission Regulation No 814/2013 [1] requirements. The characteristics that are studied are the stored energy density of the system, the heat transfer rate through the HE during the charging and discharging processes, the adequacy of produced hot water amount and the storage efficiency of the tank. The results of the experiments confirmed the potential of the system to meet several prerequisites of a DHW installation and in addition to make the operation of the coupled solar collector or ground heat pump efficient.

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Integration of PCM in domestic hot water tanks: Optimization for shifting peak demand

Cited by 88 publications

References 20 publications

Thermal performance assessment and improvement of a solar domestic hot water tank with PCM in the mantle

Thermal performance assessment and improvement of a solar domestic hot water tank with PCM in the mantle

Experimental investigations on cylindrical latent heat storage units with sodium acetate trihydrate composites utilizing supercooling

Evaluating a prototype compact thermal energy storage tank using paraffin-based phase change material for domestic hot water production

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