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High performance district cooling.

Author(s) : PAUL J.

Summary

District cooling with chilled water suffers from the small temperature difference and therefore from the small enthalpy difference between supply and return, which is at the most 5/15°C, resulting in large distribution pipes and transport pumps, which are even adding heat to the circulating water. Utilizing latent energy in form of liquid, pumpable ice ("binary ice") features smaller pipe diameter, smaller pumps, improved heat transfer at the point of use, and higher air dehumidification because of the lower temperature. Cold energy can be stored easily, which reduces the installed refrigerating capacity. From a district cooling network with binary ice can always be extracted enough energy once a sudden demand for cooling occurs, since the network is tolerant to high fluctuations. The capacity of existing district cooling installations with chilled water can be increased by more than 300% if binary ice is applied. In connection with "water as refrigerant" a high COP can be obtained, which is similar to conventional chilled water systems, if ice storage, night operation at reduced condensing temperature and lower pumping power are taken into account.

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Pages: ICR07-E2-852

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Details

  • Original title: High performance district cooling.
  • Record ID : 2007-2258
  • Languages: English
  • Subject: Technology
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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