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Composite sorbents of methanol adapted to a new cycle for upgrading the ambient heat.

Number: AD-MA-1047

Author(s) : GREKOVA A., GORDEEVA L., TOKAREV M., et al.

Summary

Adsorptive heat transformation (AHT) is an emerging technology that is especially promising for low temperature heat sources [1]. Recently a new adsorption cycle (the so-called "Heat from Cold", HeCol) has been suggested for upgrading the ambient heat in cold regions. Two natural heat sources (e.g. a water basin and the ambient air), both being at rather low temperature (about 0?C and below), are used to produce heat at higher temperature (30 – 50?C), suitable for heating purposes. This paper addresses the preparation and study of composite sorbents of methanol specialized for this cycle: 1) searching of the imaginary sorbents optimal for the HeCol cycles on the base of thermodynamic analysis, 2) synthesis of new composite sorbents on the base of calcium halides (CaCl2, CaBr2 and their mixture confined inside the silica gel pores), and investigation of their sorption equilibrium with methanol, 3) testing a lab-scale HeCol prototype to demonstrate the feasibility of the HeCol cycle with the new composite sorbent. It is shown that during methanol sorption the formation of complexes CaClxBr2-x·nCH3OH (n = 2, 4) occurs. The affinity of the composites to methanol vapor increases in the row CaCl2 < CaClBr < CaBr2, which results in a consecutive shift of the sorption isotherms towards lower methanol pressure. The composite sorbents exchange up to 0.46 g of methanol per 1 gram of the composite in the appropriate cycles that exceeds this value for commercial activated carbons.

Details

  • Original title: Composite sorbents of methanol adapted to a new cycle for upgrading the ambient heat.
  • Record ID : 30022930
  • Languages: English
  • Source: International sorption heat pump conference, ISHPC 2017, Tokyo august 7-10.
  • Publication date: 2017/08/07

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