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Study of micro channel heat exchanger for automotive heat pump system.

Number: pap. 2160

Author(s) : HAYASE G.

Summary

Micro channel heat exchanger (MC-HEX) is more effective for a performance enhancement than a conventional fin and tube heat exchanger (F&T). MC-HEX was applied to the automotive HVAC system at first, then it was applied to a residential air-conditioner recently. Because MC-HEX helps to reduce refrigerant quantities in air-conditioner systems, we apply MC-HEX to not only cooling cycles but also heat pump cycles for residential air-conditioners. It means that our MC-HEX could solve the issue of frost in heating mode.

On the other hand, the heat pump cycle came to be applied to the automotive HVAC system for reducing consumption electricity of EV and HEV/PHEV. However, the typical automotive heat pump cycle is different from the heat pump cycle of a residential air-conditioner. Usually the heat pump cycle of a residential air-conditioner is consisted of two heat exchangers with a reverse cycle mode, but the automotive heat pump cycle consist of three heat exchangers without reverse cycle modes. Therefore, MC-HEX of a residential air-conditioner cannot be applied to an automotive HVAC system especially for outside heat exchangers.

In this paper, our MC-HEX for an outdoor unit of residential air-conditioner is modified to apply to an automotive heat pump cycle. The tube-pass design of our MC-HEX for an outdoor unit of residential air-conditioner gives priority to the performance in the evaporation condition (heating mode) because of improving annual efficiency. As a result, the condensation performance should decrease, because the most suitable tube-pass design of the condensation is different from the evaporation in MC-HEX. But MC-HEX for an automotive heat pump system has to give priority to the performance in the condensation condition (cooling mode) with high frost performance. This trade-off is solved by developing a variable circuit which applied the tube-pass arrangement that is different from a condensation condition and an evaporation condition. The inside structure of the header for controlling distribution which can correspond to the down flow of the refrigerant in the evaporation condition is also developed. As a result, our MC-HEX has the same condensation performance with an automotive HVAC system and the same evaporation performance and frost performance with a residential air-conditioner.

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Pages: 10

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Details

  • Original title: Study of micro channel heat exchanger for automotive heat pump system.
  • Record ID : 30024428
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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