US 4,730,663 A · Passive cooling arrangement

Abstract

A passive cooling arrangement includes a primary hot-cooling circuit and a econdary convection cooling circuit. A condenser is arranged in the lower region of the convection cooling circuit. This condenser is provided for the medium of the hot-cooling circuit which is to be cooled down. A heat exchanger is arranged in the upper region of the secondary convection cooling circuit for cooling the coolant down by means of the ambient air. In order to prevent the condenser from freezing up in periods of frost which are of prolonged duration, the secondary convection cooling circuit includes means which, in the event of a reduction in the volume of the coolant due to falling temperature, effects a throttling or interruption of the flow of coolant through the heat exchanger. In this way the condenser cannot be cooled down any further.

Claims4

Dependent claims

A passive cooling arrangement comprising:

a secondary convection cooling circuit for conducting a coolant which reduces in volume in response to a drop in temperature, said secondary convection cooling circuit having an upper portion and a lower portion;
a primary hot-cooling circuit including a condenser for receiving the medium to be cooled, said condenser being connected into said lower portion to facilitate a transfer of heat from said medium to said coolant;
heat exchanger means mounted in said upper portion for transferring heat received by the coolant to the ambient to thereby cool the coolant to approximately the temperature of the ambient;
and,
throttling means for throttling or interrupting the flow of the coolant through said secondary convection cooling circuit in response to a reduction in the volume of the coolant.

2 more elements

Dependencies are inferred from the claim text.

Passive cooling arrangement

Life of this patent

Passive cooling arrangement

Life of this patent

Abstract

Claims4