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Experimental investigation of solution transportation absorption chiller in steady/Non-steady state with heat transportation of 500 meters.

Number: pap. n. 11

Author(s) : WATANABE F., ENOKI K., TANAKA S., et al.

Summary

Effective use of energy through cogeneration of waste heat from factories is becoming more common. Waste heat lowered to approximately 100degC can be used to obtain chilled water using an absorption chiller. Therefore, deployment of absorption chillers can contribute to further energy savings. However, conventional absorption chillers lose energy when the waste heat source is far from the location of chilled water demand because chilled water must be transported using pipes. Therefore, we propose a solution transportation absorption chiller (STA) that uses an absorption chiller cycle. The STA obtains chilled water from waste heat by circulating the refrigerant and absorbent inside the chiller as in conventional absorption chillers. However, the STA uses thermal energy from waste heat to change the refrigerant concentration in the absorbent. In other words, the chemical potential of the refrigerant is changed, and the refrigerant is transported via pipes to the location of chilled water demand, where an evaporator is used to obtain chilled water. As a result, STA allows long-distance transportation of waste heat because the heat insulation of pipes required in conventional heat transport-type absorption chillers is not necessary. Use of STA is expected to further promote use of waste heat. This research aims to build an experimental STA machine and obtain data for practical deployment. Ammonia and water are chosen as the refrigerant and absorbent, respectively, in this research considering long-distance transport in winter. The experiments reproduced pressure loss at solvent transport distances of 0 m and 500 m, and data is collected regarding cooling capacity and coefficient of performance (COP) in steady state conditions and the concentration, mass flow rate, and liquid level of the working fluid in various equipment. Here, a transport distance of 0 m corresponds to conventional absorption chillers, and 500 m correspond to STAs. The experiments showed that the cooling capacity and COP are independent of the transport distance and that STAs can operate stably with performance similar to conventional chillers even for long-distance transport. On the other hand, A solvent transport pipe with an inner volume corresponding to a transport distance of 200 m is used to reduce the part–load ratio from steady state conditions to achieve non-steady state conditions, and cooling capacity behavior under non-steady state conditions is measured. Approximately 10 additional minutes are needed for the cooling capacity to reach the designated value when the transport distance is 200 m compared to a distance of 0 m.

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Pages: 10 p.

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Details

  • Original title: Experimental investigation of solution transportation absorption chiller in steady/Non-steady state with heat transportation of 500 meters.
  • Record ID : 30013318
  • Languages: English
  • Source: International sorption heat pump conference (ISHPC2014), College Park, United States, March 31-April 2, 2014.
  • Publication date: 2014/03/02

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