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A dilution control apparatus for use in an absorption cooling system of the type which uses a refrigerant and an absorbent, and which includes a generator, a condenser having a condenser sump, an absorber having an absorber sump, and an evaporator having an evaporator sump. At least one refrigerant

A dilution control apparatus for use in an absorption cooling system of the type which uses a refrigerant and an absorbent, and which includes a generator, a condenser having a condenser sump, an absorber having an absorber sump, and an evaporator having an evaporator sump. At least one refrigerant reservoir is arranged to receive refrigerant condensing within the condenser, and to store a quantity of refrigerant which, if released into the system during the dilution phase of the system shutdown process, is sufficient to lower the concentration of the refrigerant-absorbent solution to a concentration low enough to prevent crystals from forming in the absorber after the shutdown process has been completed. Refrigerant is released from the at least one refrigerant reservoir to the evaporator sump at a variable rate, through a first refrigerant releasing path, when the system operates under a cooling load that fluctuates with time. Refrigerant is released from the at least one refrigerant reservoir to the evaporator sump, through the first refrigerant releasing path and through a second refrigerant releasing path, when the system is being shut down.

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[ We claim:] [1.]1. In an absorption cooling machine of the type which uses a refrigerant and an absorbent and which includes a generator, a condenser, an evaporator including an evaporator sump and a refrigerant pump for pumping refrigerant from said evaporator sump, an absorber including an absorb

[ We claim:] [1.]1. In an absorption cooling machine of the type which uses a refrigerant and an absorbent and which includes a generator, a condenser, an evaporator including an evaporator sump and a refrigerant pump for pumping refrigerant from said evaporator sump, an absorber including an absorber sump and a solution pump for pumping a refrigerant-absorbent solution from said absorber sump, said evaporator sump and said absorber sump being separated by a partition, and means for connecting said generator, condenser, evaporator and absorber to one another to form a closed absorption cooling system, said cooling system further being of the type which is designed to shut down in accordance with a dilution cycle during which the quantity of refrigerant within the evaporator sump becomes large enough to overflow said partition and thereby reduce the concentration of the solution in said absorber sump to a value below that at which crystallization occurs, an improved refrigerant control apparatus comprising:a primary refrigerant reservoir for receiving refrigerant condensing within said condenser and for storing a quantity of refrigerant which, if released into the system during said dilution cycle, is sufficient to lower the concentration of said solution from a concentration which is within the range of concentrations that said solution may have when the system operates in its cooling mode to a concentration which is low enough to prevent crystals from forming in said solution after said dilution cycle has been completed;primary refrigerant releasing means, including barrier means, located at an extremity of said primary reservoir, for defining at least one primary flow path along which refrigerant may flow from said primary reservoir to said evaporator sump when the system is operating in its cooling mode;a secondary refrigerant reservoir disposed in bidirectional fluidic communication with said primary reservoir; andsecondary refrigerant releasing means for establishing a secondary flow path along which refrigerant may flow from said secondary reservoir to said evaporator sump when said dilution cycle is in progress.