US 4,294,080 AGranted

Desorption step in absorption heat pumps and refrigerators

AssigneeInstitut Francais du Petrole

InventorsGeorges Cohen, Alexandre Rojey

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Abstract

An improvement to absorption heat pumps and refrigerators, which comprises supplying of a first fraction S.sub.1 of a solution S subjected to a desorption step, to a heating and vaporization zone E where the solution S.sub.1 is progressively heated and vaporized in a temperature interval .DELTA. between an initial temperature T.sub.i, and a final temperature T.sub.f, by heat exchange with a fluid external to the desorption zone, while a vapor phase V' and optionally, a liquid phase L' are produced, which phases are separated from each other, and a second fraction S.sub.2 of the solution S is fed to a desorption zone D in which the fraction S.sub.2 and vapor phase V' are contacted to obtain a liquid phase L", phases L' and L" forming the phase L which is recycled to the absorption step.

Claims18

Dependent claims

An improved process for operating an absorption heat pump or an absorption refrigerator, the improvement comprising the steps of:

(a) directly contacting a solute vapor phase (V") with a liquid phase (L') and a liquid phase (L") in an absorption zone, the liquid phases (L') and (L") being solvents for the solute vapor phase (V"), thereby recovering a solution (S);
(b) dividing the recovered solution (S) into a first portion (S.sub.1) and a second portion (S.sub.2), supplying said first portion (S.sub.1) of the solution (S) to an indirect contact heat exchange zone and indirectly contacting said portion (S.sub.1) with an external heating fluid in said indirect contact heat exchange zone, thereby recovering a vapor phase (V'), and a residual liquid phase (L'), separating said vapor phase (V') from said residual liquid phase (L') and feeding back said liquid phase (L') to step (a);
(c) directly contacting, in counter-current contact, the vapor phase (V') from step (b) with said second portion (S.sub.2) of the solution (S) in a desorption zone, thereby recovering separately a vapor phase (V) and a liquid phase (L") and feeding back said liquid phase (L") to step (a);
(d) passing the vapor phase (V) from step (c) through a condensation zone, externally cooling the vapor phase (V) in said condensation zone with an external cooling fluid and recovering a condensed phase (C);
and
(e) passing said condensed phase (C) through an evaporation zone, externally heating said evaporation zone with an external heating fluid to vaporize at least a portion of said condensed phase (C), recovering a vapor phase (V") therefrom, and feeding back said vapor phase (V") to step (a).

3 more elements

Dependencies are inferred from the claim text.