Determination of the enthalpy of PCM as a function of temperature using a heat-flux DSC-A study of different measurement procedures and their accuracy

Castellón, Cecilia; Günther, Eva; Mehling, Harald; Hiebler, Stefan; Cabeza, Luisa F.

doi:10.1002/er.1443

Cited by 163 publications

(73 citation statements)

References 8 publications

(8 reference statements)

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“…This phenomenon in PCMs is referred to as 'hysterisis' and it is particularly significant with certain types of PCM, for example inorganic PCMs. However, past research [Castellon, 2008] has shown that, at very slow heating and cooling rates (~0.1C/min), the hysteresis effect in paraffinic PCMs, such as the present nano-PCM, is negligible. In fact, the DSC data shown in Figure 1 and Figure 2 show that the phase change temperatures during cooling and heating are nearly identical.…”

Section: Materials Propertiesmentioning

confidence: 66%

See 1 more Smart Citation

Field Testing of Nano-PCM Enhanced Building Envelope Components

Biswas¹,

Childs²,

Atchley³

2013

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Section: Materials Propertiesmentioning

confidence: 66%

“…Annual simulations were done using typical meteorological year (TMY3) 4 weather data for Charleston. EnergyPlus 5 was used to create input files of hourly solar radiation and exterior heat transfer coefficients for the different wall orientations.…”

Section: Annual Simulation In Charleston Using Tmy3 Datamentioning

confidence: 99%

Field Testing of Nano-PCM Enhanced Building Envelope Components

Biswas¹,

Childs²,

Atchley³

2013

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“…The few milligrams of mortars samples necessary for DSC testing were gathered by drilling of the hardened mortar. Methodology and rationale Generally, the standard measurement method for the analysis of many thermo-physical properties is the DSC [17]. A literature survey [17][18][19] revealed that there are different possibilities of operation methods to analyse PCM through DSC tests.…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

“…Methodology and rationale Generally, the standard measurement method for the analysis of many thermo-physical properties is the DSC [17]. A literature survey [17][18][19] revealed that there are different possibilities of operation methods to analyse PCM through DSC tests. The two most common methods are: the dynamic method, which corresponds to a constant heating rate and the step method, which consists in applying variable heating rates to the sample [18].…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

Estimation of the specific enthalpy–temperature functions for plastering mortars containing hybrid mixes of phase change materials

Kheradmand

Azenha

2014

Int J Energy Environ Eng

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The use of phase change materials (PCMs) for the building sector is increasingly attracting attention from researchers and practitioners. Several research studies forwarded the possibility of incorporating microencapsulated PCM in plastering mortars for building façades, in pursuit of increased energy efficiency associated with the heat storage capacity of PCM. However, most of these studies are centred in the use of a single type of PCM, which is bound to be more adequate for a given season of the year (e.g. winter or summer) than for all the seasons. The study proposed in this work regards the evaluation of the possibility of using more than one kind of PCM, with distinct melting ranges, here termed as hybrid PCMs, in plastering mortars, to achieve adequately advantageous performance in all seasons of the year. To characterize the PCM, the specific enthalpy and phase change temperature should be adequately measured. The main purpose of this study was to show the conceptual feasibility of combining PCMs in mortars and to evaluate the behaviour of the resulting mortars with differential scanning calorimeter. The results showed that the behaviour of the mortar that contains more than one type of PCM can be predicted through the superposition of effects of the independent PCMs and no interaction occurs between them. The knowledge obtained from the experimental testing established bases for a framework of numerical simulation of real-scale applications, which can be used to ascertain the feasibility of the hybrid PCM concept for decreases in energy consumption of heating/cooling demands in the buildings.

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“….1 This calibration shall be performed once for each apparatus, using the test procedure based on Tleoubaev et al (9). A1.2 The correction factor is not equal to the specific heat of the transducers themselves because the temperature profile through the transducer thickness is not linear until the temperature within the apparatus plate has reached steady state.…”

Section: Annexes (Mandatory Information)mentioning

confidence: 99%

Summary Report: Development of a New ASTM Standard Test Method for Phase Change Materials

Biswas¹,

Stovall²,

Desjarlais³

2013

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PREFACEMaterials used for thermal insulation and storage, along with other construction and building envelope components, are subjected to transient thermal conditions which can include dynamically changing temperature, moisture content, surface heat transfer, specific heat, etc. In addition, most building design and energy-related standards are based on a steady-state criterion (R-values using the apparent thermal conductivity measurements). This mismatch between the steady-state principles used in design and code requirements and the dynamic operation of buildings can result in lower thermal efficiency than achievable or higher cost (due to addition of more insulation than required). This mismatch can also lead to a gross under-estimation of the performance of materials that store energy under cyclic temperature conditions, for example phase change materials (PCM). Although some experimental methods for transient analysis of building envelopes have been developed, there are no standardized testing procedures available to quantitatively characterize materials and systems under dynamic conditions. Data on dynamic material characteristics are needed to improve thermal design and analysis, whole-building simulations, and energy code-related work. This led to the development of a proposed ASTM Standard Test Method for characterizing PCM products under dynamic conditions. INTRODUCTIONAn ASTM International task group was formed with representatives from research organizations, PCM and insulation manufacturers, testing laboratories, etc., to develop an ASTM standard test method, using a heat flow meter apparatus (HFMA), to make heat-flow measurements under prescribed dynamic, or nonsteady-state, conditions. The HFMA is typically used for measuring steady-state thermal transmission properties of materials, following ASTM C518 [1]. The new 'dynamic' test method is based on a modification of the C518 test method, for measuring volumetric specific heat of regular (i.e. with no PCM) thermal insulation materials [2]. The proposed test method describes the methodology for using a HFMA for measuring thermal storage properties of phase change materials and products. It requires the measurement of non-steady-state heat flow into or out of a flat slab specimen to determine the stored energy (i.e. enthalpy) change as a function of temperature. In particular, this test method is intended to measure the sensible and latent heat storage capacity of products incorporating phase-change materials (PCM). The thermal storage capacity of a PCM is well defined via four parameters [3]: specific heats of both solid and liquid phases, phase change temperature(s) and phase change enthalpy.This report provides brief summaries of the proposed standard test method and the standard developmentrelated activities at Oak Ridge National Laboratory (ORNL) during fiscal year 2013 (FY13). The draft standard document is also provided as an appendix. Figure 1 shows a typical HFMA being used for the dynamic test standard under development. It contains two i...

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Determination of the enthalpy of PCM as a function of temperature using a heat-flux DSC-A study of different measurement procedures and their accuracy

Cited by 163 publications

References 8 publications

Field Testing of Nano-PCM Enhanced Building Envelope Components

Field Testing of Nano-PCM Enhanced Building Envelope Components

Estimation of the specific enthalpy–temperature functions for plastering mortars containing hybrid mixes of phase change materials

Summary Report: Development of a New ASTM Standard Test Method for Phase Change Materials

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