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IIR document

Industrial heat pump using fluid mixture.

Number: pap. n. 242

Author(s) : ENDO N., HIRANO S.

Summary

High temperature heat pumps are required for industrial usage for energy savings and CO2 emission reduction. A hybrid cycle which uses the principles of absorption and compression was studied. There are two types of absorption/compression hybrid cycles, categorized by their origins. The hybrid cycle studied here is the one developed from the compression cycle, and it has almost the same components as the compression one. Water and glycerol mixture was supposed as a working fluid. The temperature difference between the boiling points of the two fluids is large, so the temperature gradient will be large in the heat exchangers. The systems of the two types were examined in the chart analysis; the system without an internal heat exchanger and the system with an internal heat exchanger. In the usage typical in the conventional compression heat pumps, that the heat is transferred from the low temperature to the high temperature with a certain temperature lift, the system without an internal heat exchanger shows a moderate COP. The system with an internal heat exchanger can realize the large temperature lift with small compression ratio and low working pressure, but the irreversible work at the heat exchanger will be large and the merit superior to the system without an internal heat exchanger will be canceled. This large loss at the internal heat exchanger is caused by the characteristic of the curves of the gas line and the liquid line, resulting in the disagreement of the temperature difference between the inlet and the outlet of the internal heat exchanger. The promising application of the absorption/compression system is for the system in which both the heat source and the heat sink have temperature gradients. One example is the materials heating and products cooling. The second example is a pinch point cancelation. Near the pinch point, both high temperature and low temperature fluids have the temperature gradient and the temperature lift by the heat pump will be relatively small.

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Pages: 7 p.

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Details

  • Original title: Industrial heat pump using fluid mixture.
  • Record ID : 30015972
  • Languages: English
  • Source: Proceedings of the 24th IIR International Congress of Refrigeration: Yokohama, Japan, August 16-22, 2015.
  • Publication date: 2015/08/16
  • DOI: http://dx.doi.org/10.18462/iir.icr.2015.0242

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