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Experimental evaluation of a variable-stage open absorption heat pump system utilizing aqueous KCOOH solution as absorbent.

Author(s) : YE B., DING Y., WANG Z., CHEN G.

Type of article: IJR article

Summary

Open absorption technology is a potential alternative for the heat recovery of flue gas, which is one of the main carriers for the low-grade waste heat. A variable-stage open absorption heat pump was proposed to work on wide working condition ranges by adjusting its equivalent stage through a low-pressure generator-absorber assembly. We have demonstrated that with LiBr/H2O as absorbent, the system could achieve COP of 1.2–2, corresponding to an equivalent stage of 1–4.6. In this paper, an experimental prototype was established, including a solution distribution regulation, which aimed to optimize the solution distribution ratio between the spraying solution in the absorber and circulation solution in the cycle and further to enhance the system performance. KCOOH/H2O was selected as the absorbent to overcome the challenges of crystallization and corrosion. Experimental results showed a COP of 1.17–1.85 and heat recovery rate of 48.7–89% with heat source temperature varied from 86 to110 °C and hot water delivery temperature varied from 55 to 70 °C. A simulation model based on the thermophysical properties of KCOOH/H2O had also been established to supplement experimental results with a wider range of external sources. Results showed that compared to LiBr/H2O system, KCOOH/H2O system had a larger working temperature range and higher heat recovery rate at the expense of a lower COP, i.e., 6–11% and 12–15% lower than that of LiBr/H2O system under SDR of 0.2 and 0.5 respectively. A wider concentration working range of KCOOH/H2O (56.4%-79.8%), temperature range of 50–95 °C, and relative humidity range of 10–100% had been simulated to obtain performance maps of VS-OAHP system in the form of psychrometric chart. This work provided guidance for the practical operation and efficiency improvement for low-grade waste heat recovery.

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Pages: 83-95

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Details

  • Original title: Experimental evaluation of a variable-stage open absorption heat pump system utilizing aqueous KCOOH solution as absorbent.
  • Record ID : 30031147
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 148
  • Publication date: 2023/04
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2022.12.029

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