Experimental investigation of stabilization of flowing water temperature with a water-PCM heat exchanger

Charvát, Pavel; Stetina, Josef; Pech, Ondrej; Klimeš, Lubomír; Ostrý, Milan

doi:10.1051/epjconf/20146702046

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…A standard refrigerator's condenser was employed in the research (1). It is constructed with a spirally arranged steel coils and fins with round intersection transversely welded.…”

Section: Methodsmentioning

confidence: 99%

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Quasi-stationary phase change heat transfer on a fin

Orzechowski

Stokowiec

2016

EPJ Web of Conferences

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Abstract. The paper presents heat transfer research basing on a long fin with a circular cross-section. Its basis is welded to the pipe where the hot liquid paraffin, having a temperature of 70oC at the inflow, is pumped. The analyzed element is a recurrent part of a refrigeration's condenser, which is immersed in a paraffin. The temperature of the inflowing liquid is higher than the temperature of the melting process for paraffin, which allows the paraffin to liquify. The temperature at the basis of the rib changes and it is assumed that the heat transfer is quasi-stationary. On this basis the estimation of the mean value of heat transfer coefficient was conducted. The unsteady thermal field of the investigated system was registered with an infrared camera V50 produced by a Polish company Vigo System. This device is equipped with a microbolometric detector with 384 × 288 elements and the single pixel size 25 × 25 ȝm. Their thermal resolution is lower than 70 mK at a temperature of 30 o C. The camera operates at 7,5 ÷ 14 μm long-wave infrared radiation range. For a typical lens 35 mm the special resolution is 0.7 mrad. The result of the calculations is mean heat transfer coefficient for the considered time series. It is equal to 50 W m -2 K -1 and 47 W m -2 K -1 on the left and right side of the fin, respectively. The distance between the experimental data and the curve approximating the temperature distribution was assessed with the standard deviation, Sd = 0.04 K.

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“…A standard refrigerator's condenser was employed in the research (1). It is constructed with a spirally arranged steel coils and fins with round intersection transversely welded.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore phase change materials (PCM) can be a promising alternative used in order to absorb latent energy. They seem to be a solution to the problems of sensible systems since they work during phase change process and thus stabilize the temperature [1]. Latent heat is usually produced through solidification or melting.…”

Section: Introductionmentioning

confidence: 99%

Quasi-stationary phase change heat transfer on a fin

Orzechowski

Stokowiec

2016

EPJ Web of Conferences

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“…Alawadhi et al [10] used a phase change material to smoothen temperature variations of a fluid flowing in a channel and showed that by using the PCM as a thermal capacitor, large swings in temperature at the inlet could be dampened at the outlet. Charvat et al [11] studied the suitability for a water-PCM heat exchanger to act as a thermal stabilizer. They conducted experiments which used square-wave temperature fluctuations at the water inlet and concluded that effective temperature stabilization was possible when the inlet temperature fluctuated around the phase change temperature of the PCM.…”

Section: Introductionmentioning

confidence: 99%

Application of Phase Change Material-Based Thermal Capacitor in Double Tube Heat Exchanger—A Numerical Investigation

2020

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In many heat transfer related applications, there is a need for a stable, constant supply temperature. As a result, the integration of intermittent renewable sources of heat into these processes can prove to be challenging, requiring special temperature smoothing devices or strategies. This study focuses on the application of phase change materials integrated into a double tube heat exchanger as a possible thermal smoothing device. The objective of this study is to evaluate the ability of the exchanger to smoothen out temperature variations within the cold stream outlet while the hot stream is subject to oscillating inlet conditions. A computational fluid dynamics approach is used where a numerical model is developed, validated and then used to model the conjugate heat transfer within the heat exchanger. Four organic phase change materials (PCM) with different phase change temperatures were selected for investigation (myristic, octadecane, eicosane, and wax) to study the relationship between melting temperature and stabilization performance. A parametric study was then conducted by varying the Reynolds number of the flow as well as temperature oscillation period and amplitude to study the sensitivity of the system. The results confirm the potential of a phase change material-based thermal capacitor at dampening oscillations across the heat exchanger.

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“…If the exhaust gas temperature is higher than the tank material temperature, heat flow flows from the exhaust gas into the tank material. Similarly, if the medium temperature is lower, the heat flux has the opposite direction [17]. The use of a heat accumulator with PCM material to stabilize the exhaust gas temperature, therefore, seems to be a suitable solution while maintaining optimal conditions for the economics of engine operation.…”

mentioning

confidence: 99%

Exhaust Gas Temperature Pulsations of a Gasoline Engine and Its Stabilization Using Thermal Energy Storage System to Reduce Emissions

2022

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Modern automotive gasoline engines have highly efficient after-treatment systems that reduce exhaust gas emissions. However, this efficiency greatly depends on the conditions of the exhaust gas, mainly the temperature and air–fuel ratio. The temperature instability during transient conditions may cause a reduction in the efficiency of the three-way catalyst (TWC). By using a thermal energy storage system before TWC, this negative effect can be suppressed. In this paper, the effects of the temperature stabilization on the efficiency of the three-way catalyst were investigated on a 1-D turbocharged gasoline engine model, with a focus on fuel consumption and emissions. The thermal energy storage system (TESS) was based on PCM materials and was built in the exhaust between the turbine and TWC to use the energy of the exhaust gas. Three different materials were picked up as possible mediums in the storage system. Based on the results, the usage of a TESS in a gasoline after-treatment system has shown great potential in improving TWC efficiency. This approach can assist the catalyst to operate under optimal conditions during the drive. In this study, it was found that facilitating the heat transfer between the PCM and the catalyst can significantly improve the emissions’ reduction performance by avoiding the catalyst to light out after the cold start. The TESS with PCM H430 proved to reduce the cumulative CO and HC emissions by 8.2% and 10.6%, respectively, during the drive. Although a TES system increases the after-treatment cost, it can result in emission reductions and fuel consumption over the vehicle’s operating life.

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Experimental investigation of stabilization of flowing water temperature with a water-PCM heat exchanger

Cited by 7 publications

References 6 publications

Quasi-stationary phase change heat transfer on a fin

Quasi-stationary phase change heat transfer on a fin

Application of Phase Change Material-Based Thermal Capacitor in Double Tube Heat Exchanger—A Numerical Investigation

Exhaust Gas Temperature Pulsations of a Gasoline Engine and Its Stabilization Using Thermal Energy Storage System to Reduce Emissions

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