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Advances in plate heat exchangers used as DX evaporators.

Author(s) : BHADSAVLE A., KUMAR H.

Summary

Many designers have attempted to use plate heat exchangers as direct expansion evaporators. Direct expansion type of evaporator is desirable for a low cost system design with the lowest amount of refrigerant charge. This is more important when ammonia is used as a refrigerant. There are two major obstacles that limit the use of these exchangers for large duty chillers: the distribution of the two-phase refrigerant through the inlet port of the plate heat exchanger and the availability of the proper expansion devise. Many heat exchanger manufacturers have tried different types of distributor tubes. The authors have not seen a successful installation above 600 TR using direct expansion plate and frame evaporators. A research is presented on existing literature on actual installations or theoretical designs of such DX evaporators. The paper concentrates the work done with ammonia evaporators. A new idea which was patented recently for a specially designed plate and frame heat exchanger is presented. This design includes a special feeding tube for each welded pair. The idea is to reduce the pressure drop taken at the expansion valve and thereby reduce the amount of flash gas entering the port. The design and performance of a 1000 TR (3500 kW) system recently installed at a chemical plant is discussed. The authors believe that this is the first chiller of this size designed with an ammonia DX evaporator.

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Pages: 2007-2

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Details

  • Original title: Advances in plate heat exchangers used as DX evaporators.
  • Record ID : 2007-2066
  • Languages: English
  • Subject: Technology
  • Source: Ammonia Refrigeration Technology for Today and Tomorrow.
  • Publication date: 2007/04/19

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