Detail publikace

Experimental investigation of the thermal behaviour of a water-PCM heat exchanger for stabilization of water temperature

Originální název

Experimental investigation of the thermal behaviour of a water-PCM heat exchanger for stabilization of water temperature

Anglický název

Experimental investigation of the thermal behaviour of a water-PCM heat exchanger for stabilization of water temperature

Jazyk

en

Originální abstrakt

A stability of fluid temperature plays an important role in many applications and there are various ways to stabilize the temperature of a flowing fluid. Beside the active temperature control an additional thermal mass can be used to increase the thermal inertia of the system and thus to increase its thermal stability. Both sensible and latent heat storage materials can be employed for that purpose. The Phase Change Materials (PCMs), which have already found their use in many thermal storage applications, can be employed for stabilization of fluid temperature. Experiments have been carried out in order to investigate stabilization of water temperature with a water-PCM heat exchanger. The water-PCM heat exchanger was of a rather simple design. It was a round tube, through which the water flowed, surrounded with an annular layer of PCM. A paraffin-based PCM with the melting temperature of 42 C was used in the experiments. The experimental set-up consisted of two water reservoirs kept at different temperatures, the water-PCM heat exchanger, PC controlled valves and a data acquisition system. As the first step a response to a step change in the water temperature at the inlet of the heat exchanger was investigated. Subsequently, a series of experiments with a square wave change of temperature at the inlet of the exchanger were carried out. The quasi-square-wave temperature fluctuations were achieved through periodic switching between two water reservoirs kept at different temperatures. The results of experiments show that a water-PCM heat exchanger can effectively be used to stabilize the flowing water temperature when the inlet temperature changes are around the melting range of the PCM.

Anglický abstrakt

A stability of fluid temperature plays an important role in many applications and there are various ways to stabilize the temperature of a flowing fluid. Beside the active temperature control an additional thermal mass can be used to increase the thermal inertia of the system and thus to increase its thermal stability. Both sensible and latent heat storage materials can be employed for that purpose. The Phase Change Materials (PCMs), which have already found their use in many thermal storage applications, can be employed for stabilization of fluid temperature. Experiments have been carried out in order to investigate stabilization of water temperature with a water-PCM heat exchanger. The water-PCM heat exchanger was of a rather simple design. It was a round tube, through which the water flowed, surrounded with an annular layer of PCM. A paraffin-based PCM with the melting temperature of 42 C was used in the experiments. The experimental set-up consisted of two water reservoirs kept at different temperatures, the water-PCM heat exchanger, PC controlled valves and a data acquisition system. As the first step a response to a step change in the water temperature at the inlet of the heat exchanger was investigated. Subsequently, a series of experiments with a square wave change of temperature at the inlet of the exchanger were carried out. The quasi-square-wave temperature fluctuations were achieved through periodic switching between two water reservoirs kept at different temperatures. The results of experiments show that a water-PCM heat exchanger can effectively be used to stabilize the flowing water temperature when the inlet temperature changes are around the melting range of the PCM.

BibTex


@inproceedings{BUT102982,
  author="Pavel {Charvát} and Josef {Štětina} and Lubomír {Klimeš} and Milan {Ostrý} and Jiří {Hejčík}",
  title="Experimental investigation of the thermal behaviour of a water-PCM heat exchanger for stabilization of water temperature",
  annote="A stability of fluid temperature plays an important role in many applications and there are various ways to stabilize the temperature of a flowing fluid. Beside the active temperature control an additional thermal mass can be used to increase the thermal inertia of the system and thus to increase its thermal stability. Both sensible and latent heat storage materials can be employed for that purpose. The Phase Change Materials (PCMs), which have already found their use in many thermal storage applications, can be employed for stabilization of fluid temperature. Experiments have been carried out in order to investigate stabilization of water temperature with a water-PCM heat exchanger. The water-PCM heat exchanger was of a rather simple design. It was a round tube, through which the water flowed, surrounded with an annular layer of PCM. A paraffin-based PCM with the melting temperature of 42 C was used in the experiments. The experimental set-up consisted of two water reservoirs kept at different temperatures, the water-PCM heat exchanger, PC controlled valves and a data acquisition system. As the first step a response to a step change in the water temperature at the inlet of the heat exchanger was investigated. Subsequently, a series of experiments with a square wave change of temperature at the inlet of the exchanger were carried out. The quasi-square-wave temperature fluctuations were achieved through periodic switching between two water reservoirs kept at different temperatures. The results of experiments show that a water-PCM heat exchanger can effectively be used to stabilize the flowing water temperature when the inlet temperature changes are around the melting range of the PCM.",
  address="Tokyo University of Science Yamaguchi",
  booktitle="Sborník příspěvků konference 24th International Symposium on Transport Phenomena 2013",
  chapter="102982",
  edition="1",
  howpublished="electronic, physical medium",
  institution="Tokyo University of Science Yamaguchi",
  year="2013",
  month="november",
  pages="280--283",
  publisher="Tokyo University of Science Yamaguchi",
  type="conference paper"
}