System for producing refrigeration and a heated liquid and control therefor

Claim 1

A system for producing refrigeration and selectively operable for producing a heated liquid comprising a. compressor means for compressing a vaporized regrigerant; b. air cooled condenser means connected to said compressor means for receiving compressed refrigerant and condensing same by heat exchange with a source of air, further including fan means for forcing said air in heat exchange relationship with said air cooled condenser means; c. liquid cooled condenser means connected to said compressor means for receiving compressed refrigerant and condensing same by heat exchange with a source of liquid, whereby a heated liquid is produced; d. evaporator means for expanding and vaporizing said condensed refrigerant in heat exchange relationship with a refrigeration load and returning the vaporized refrigerant to said compressor means; e. means for transferring condensed refrigerant from said air cooled and liquid cooled condenser means to said evaporator means, said air cooled condenser means remaining operable to condense refrigerant at reduced capacity during those times that said liquid cooled condenser means is operable to produce a heated liquid; and f. control means for said system comprising i. first means for sensing the demand for heated liquid from said liquid cooled condenser means; and ii. second means responsive to said first means for reducing the capacity of said fan means in response to increased demand for heated liquid during those times that such demand exists, whereby the capacity of said air cooled condenser means is controlled in response to the demand for heated liquid during those times that such demand exists.

Claim 2

A system for producing refrigeration and selectively operable for producing a heated liquid comprising a. compressor means for compressing a vaporized regrigerant; b. air cooled condenser means connected to said compressor means for receiving compressed refrigerant and condensing same by heat exchange with a source of air, further including fan means for forcing said air in heat exchange relationship with said air cooled condenser means; c. liquid cooled condenser means connected to said compressor means for receiving compressed refrigerant and condensing same by heat exchange with a source of liquid, whereby a heated liquid is produced; d. evaporator means for expanding and vaporizing said condensed refrigerant in heat exchange relationship with a refrigeration load and returning the vaporized refrigerant to said compressor means; e. means for transferring condensed refrigerant from said air cooled and liquid cooled condenser means to said evaporator means, said air cooled condenser means remaining operable to condense refrigerant at reduced capacity during those times that said liquid cooled condenser means is operable to produce a heated liquid; and f. control means for said system comprising i. first means for sensing the demand for heated liquid from said liquid cooled condenser means; and ii. second means responsive to said first means for reducing the capacity of said fan means in response to increased demand for heated liquid during those times that such demand exists, whereby the capacity of said air cooled condenser means is controlled in response to the demand for heated liquid during those times that such demand exists.

Claim 14

A system for producing refrigeration and selectively operable for producing a heated liquid comprising a. compressor means for compressing a vaporized refrigerant; b. air cooled condenser means connected to said compressor means for receiving compressed refrigerant and condensing same by heat exchange with a source of air, further including fan means for forcing said air in heat exchange relationship with said air cooled condenser means; c. liquid cooled condenser means connected to said compressor means for receiving compressed refrigerant and condensing same by heat exchange with a source of liquid, whereby a heated liquid is produced; d. evaporator means for expanding and vaporizing said condensed refrigerant in heat exchange relationship with a refrigeration load and returning the vaporized refrigerant to said compressor means; e. means for transferring condensed refrigerant from said air cooled and water cooled condenser means to said evaporator means; comprising i. receiver means having a condensed refrigerant outlet connected to said evaporator means; ii. first conduit means connecting said air cooled condenser means to said receiver means; and iii. first pressure regulating valve means in said first conduit means selectively operable in a first mode to increase the pressure in said air cooled and liquid cooled condenser means and in a second mode to permit free flow through said first conduit means; f. third conduit means connected to said compressor means and said receiver means for transferring compressed vaporized refrigerant to said receiver means and including second pressure regulating valve means selectively operable in a first mode to maintain a predetermined pressure in said receiver means and in a second mode preventing flow through said third conduit means; and g. control means for said system comprising i. first means for sensing the demand for heated liquid from said liquid cooled condenser means. ii. sixth means responsive to said first means for placing said first and second pressure regulating valve means in their first modes in response to a demand for heated liquid; and iii. override means for selectively placing said first and second pressure regulating valve means in their first modes irrespective of a demand for heated liquid sensed by said first means.

Claim 15

A system for producing refrigeration and selectively operable for producing a heated liquid comprising a. compressor means for compressing a vaporized refrigerant; b. air cooled condenser means connected to said compressor means for receiving compressed refrigerant and condensing same by heat exchange with a source of air, further including fan means for forcing said air in heat exchange relationship with said air cooled condenser means; c. liquid cooled condenser means connected to said compressor means for receiving compressed refrigerant and condensing same by heat exchange with a source of liquid, whereby a heated liquid is produced; d. evaporator means for expanding and vaporizing said condensed refrigerant in heat exchange relationship with a refrigeration load and returning the vaporized refrigerant to said compressor means; e. means for transferring condensed refrigerant from said air cooled and water cooled condenser means to said evaporator means; comprising i. receiver means having a condensed refrigerant outlet connected to said evaporator means; ii. first conduit means connecting said air cooled condenser means to said receiver means; and iii. first pressure regulating valve means in said first conduit means selectively operable in a first mode to increase the pressure in said air cooled and liquid cooled condenser means and in a second mode to permit free flow through said first conduit means; f. third conduit means connected to said compressor means and said receiver means for transferring compressed vaporized refrigerant to said receiver means and including second pressure regulating valve means selectively operable in a first mode to maintain a predetermined pressure in said receiver means and in a second mode preventing flow through said third conduit means; and g. control means for said system comprising i. first means for sensing the demand for heated liquid from said liquid cooled condenser means. ii. sixth means responsive to said first means for placing said first and second pressure regulating valve means in their first modes in response to a demand for heated liquid; and iii. override means for selectively placing said first and second pressure regulating valve means in their first modes irrespective of a demand for heated liquid sensed by said first means.