Combined refrigerator water heater

• US 5,220,807 A
• Filed: 08/27/1991
• Issued: 06/22/1993
• Est. Priority Date: 08/27/1991
• Status: Expired due to Fees

• Current Assignee: Davis Energy Group, Inc.
• Original Assignee: Davis Energy Group, Inc.
• Inventors: Springer, David A., Hoeschele, Marc A., Bourne, Richard C.
• Primary Examiner(s): CHAMBERS, A MICHAEL
• Application Number:
  US07/750,299
• Time in Patent Office: 665 Days
• Field of Search: 62/238.6, 307/39, 219/441, 219/492, 165/58
• US Class Current: 62/238.6
• CPC Class Codes: F24D 17/02 using heat pumps
• CPC Class Codes: F24F 5/0096 combined with domestic apparatus
• CPC Class Codes: F24H 4/04 Storage heaters
• CPC Class Codes: F25B 29/003 of the compression type system
• CPC Class Codes: F25D 17/045 Air flow control arrangements
• CPC Class Codes: F25D 17/065 with compartments at different temperatures
• CPC Class Codes: F25D 23/12 Arrangements of compartments additional to cooling compartments; Combinations of refrigerators with other equipment, e.g. stove
• CPC Class Codes: F25D 2317/0655 through the top
• CPC Class Codes: F25D 2317/0665 from the top
• CPC Class Codes: F25D 2400/04 Refrigerators with a horizontal mullion

Abstract

A combined refrigerator-water heating system providing one or more insulated food storage compartments, includes an insulated water storage compartment, a refrigeration system including a compressor, an evaporation heat exchanger configured to cool the food storage compartment(s), a condenser configured to heat the water storage compartment, a flow restriction/expansion device, piping connecting the compressor, condenser, expansion device and evaporation in a series flow loop, a resistance electric heating element configured to heat the water storage compartment, and a control means to activate the compressor in response to cooling demand from the food storage compartment, and to activate the electric heating element in response to either heating demand from the water storage compartment or a time-of-day signal to bias resistance electric water heating operation toward times of off-peak electric use.

Claims

1. A combined refrigerator-water heating system comprising in a single unit at least one insulated food storage compartment;

an insulated water storage compartment;

a refrigeration system including a compressor, an evaporator heat exchanger for cooling said food storage compartment, a condenser for heating said water storage compartment, a flow restriction/expansion device, and piping connecting said compressor, condenser, expansion device, and evaporator in a series flow loop;

a resistance electric heating element for heating said water storage compartment; and

control means for determining periods of on and off peak electric use in response to a time of day signal, for activating said compressor in response to cooling demand from said food storage compartment, and for activating said electric heating element in response to at least one of heating demand from said water storage compartment and a time-of-day signal to bias resistance electric water heating operation toward times of off-peak electric use.

2. The combined refrigerator-water heating system according to claim 1, wherein said condenser is a first condenser, and further comprising a second condenser heat exchanger located in downstream series flow relationship with said first condenser, said second condenser being in heat exchange relationship with ambient air to facilitate compressor operation for cooling of said food storage compartment when a temperature of said water storage compartment exceeds a predetermined temperature for reliable compressor operation.

3. A combined refrigerator-water heating system comprising at least one insulated food storage compartment;

an insulated water storage compartment;

a refrigeration system including a compressor, an evaporator heat exchanger for cooling said food storage compartment, a condenser for heating said water storage compartment including a controllable heat exchanger for discharging heat from said water storage compartment to ambient air when a temperature of said water storage compartment exceeds a predetermined temperature for reliable compressor operation, a flow restriction/expansion device, and piping connecting said compressor, condenser, expansion device, and evaporator in a series flow loop;

a resistance electric heating element for heating said water storage compartment; and

control means for determining periods of on and off peak electric use in response to a time of day signal, for activating said compressor in response to cooling demand from said food storage compartment, and for activating said electric heating element in response to at least one of heating demand from said water storage compartment and a time-of-day signal to bias resistance electric water heating operation toward times of off-peak electric use.

4. A combined refrigerator-water heating comprising at least one insulated food storage compartment;

an insulated water storage compartment;

a refrigeration system including a compressor, an evaporator heat exchanger for cooling said food storage compartment, a condenser for heating said water storage compartment, a flow restriction/expansion device, and piping connecting said compressor, condenser, expansion device, and evaporator in a series flow loop;

a resistance electric heating element for heating said water storage compartment; and

control means for determining periods of on and off peak electric use in response to a time of day signal, for activating said compressor in response to cooling demand from said food storage compartment, and for activating said electric heating element in response to at least one of heating demand from said water storage compartment and a time-of-day signal to bias resistance electric water heating operation toward times of off-peak electric use, wherein said control means controls activation of said resistance electric heating element to preclude simultaneous operation of said compressor and said resistance heating element during programmable periods of on peak electrical use.

5. A combined refrigerator-water heating system comprising at least one insulated food storage compartment;

an insulated water storage compartment;

a refrigeration system including a compressor, an evaporator heat exchanger for cooling said food storage compartment, a condenser for heating said water storage compartment, a flow restriction/expansion device, and piping connecting said compressor, condenser, expansion device, and evaporator in a series flow loop;

a resistance electric heating element for heating said water storage compartment; and

control means for determining periods of on and off peak electric use in response to a time of day signal, for activating said compressor in response to cooling demand from said food storage compartment, and for activating said electric heating element in response to at least one of heating demand from said water storage compartment and a time-of-day signal to bias resistance electric water heating operation toward times of off-peak electric use;

wherein said water storage compartment comprises an outer insulated storage tank containing water at atmospheric pressure, an inner pressurized water tank immersed within said outer storage tank, a pressurized linear water tube conveying supply water through a surface of said outer tank, passing through and in extended heat exchange relationship with said water at atmospheric pressure, and into said inner tank, a pressurized water exit tube from said inner tank passing through a surface of said outer tank, a condenser heat exchange tube passing through and in extended heat exchange relationship with said water at atmospheric pressure, and said resistance electric heating element.

6. A water storage compartment according to claim 5, wherein said water tube enters said outer tank at a lower portion of said outer tank and proceeds progressively upward within said outer tank, entering said inner tank adjacent an upper portion of both said inner and outer tanks.

7. A water storage compartment according to claim 5, wherein said condenser heat exchange tube enters said outer tank adjacent an upper portion of the outer tank and proceeds progressively downward within said outer tank, before exiting said outer tank.

8. A water storage compartment according to claim 5, wherein said water tube enters said outer tank at a lower portion of said outer tank and proceeds progressively upward within said outer tank, entering said inner tank adjacent an upper portion of both said inner and outer tanks;

and said condenser heat exchange tube enters said outer tank adjacent the upper portion and proceeds progressively downward within said outer tank, before exiting said outer tank.

9. A combined refrigerator-water heating system comprising an insulated freezer compartment and a fresh food storage compartment;

an insulated water storage compartment;

first and second refrigeration systems, each including a compressor, an evaporator heat exchanger, a condenser heat exchanger for heating said water storage compartment, a flow restriction expansion device, and piping connecting said compressor, condenser, expansion device, and evaporator in a series flow loop, wherein said evaporator for said first refrigeration system cools said freezer compartment, and said evaporator for said second refrigeration system cools said fresh food storage compartment;

a resistance electric heating element for heating said insulated water compartment; and

control means for determining periods of on and off-peak electric use in response to a time of day signal, for activating said compressors in response to cooling demand from said freezer and fresh food compartments, and for activating said electric heating element in response to at least one of heating demand from said water storage compartment and a time-of-day signal to bias resistance electric water heating operation toward times of off-peak electric use.

10. A combined refrigerator-water heating system according to claim 9, wherein said control means controls said resistance electric heating element to preclude simultaneous operation of said compressor and said resistance heating element during programmable periods of on-peak electrical use.

11. A combined refrigerator-water heating system according to claim 9, wherein said condenser heat exchanger for said first refrigeration system heats water in a lower portion of said water storage compartment, and said condenser heat exchanger for said second refrigeration system heats water in an upper portion of said water storage compartment.

12. A combined refrigerator-water heating system according to claim 9, wherein the condensers of the first and second refrigerator systems are first and second condenser heat exchangers, respectively, and wherein the second condenser heat exchanger is in heat exchange relationship with ambient air to facilitate compressor operation for cooling said fresh food storage compartment when a temperature of said water storage compartment exceeds a predetermined temperature for reliable compressor operation.

13. A combined refrigerator-water heating system according to claim 9, wherein said water storage compartment includes controllable heat exchange for discharging heat from said water storage compartment to ambient air when a temperature of said water storage compartment exceeds a predetermined temperature for reliable compressor operation.

14. A combined refrigerator-water heating system according to claim 11, wherein the condensers of the first and second refrigerator systems are first and second condenser heat exchangers, respectively, and wherein the second condenser heat exchanger is in heat exchange relationship with ambient air to facilitate compressor operation for cooling of said fresh food storage compartment when a temperature of said water storage compartment exceeds a predetermined temperature for reliable compressor operation.

15. A combined refrigerator-water heating system according to claim 11, wherein said water storage compartment includes controllable a heat exchanger for discharging heat from said water storage compartment to ambient air when a temperature of said water storage compartment exceeds a predetermined temperature for reliable compressor operation.

16. A combined refrigerator-water heating system comprising at least one insulated food storage compartment;

an insulated water storage compartment;

a refrigeration system including a compressor, an evaporator heat exchanger for alternately cooling said food storage compartment and ambient air, a condenser for heating said water storage compartment, a flow restriction/expansion device, and piping connecting said compressor, condenser, expansion device, and evaporator in a series flow loop; and

control means for determining periods of on and off-peak electric use in response to a time of day signal, and for activating said compressor alternately in response to cooling demand from said food storage compartment with said evaporator cooling said food storage compartment and heating demand from said water storage compartment with said evaporator cooling ambient air.

17. A combined refrigerator-water heating system according to claim 16, wherein said control means activates said compressor with said evaporator cooling ambient air in response to one of heating demand from said water storage compartment and a time-of-day signal to bias refrigeration water heating operation toward times of off-peak electric use.

18. A combined refrigerator-water heating system comprising at least one insulated food storage compartment;

an insulated water storage compartment;

a refrigeration system including a compressor, an evaporator heat exchanger configured to alternately cool said food storage compartment and ambient air, a condenser configured to heat said water storage compartment, a flow restriction/expansion device, and piping connecting said compressor, condenser, expansion device, and evaporator in a series flow loop;

a resistance electric heating element for heating said water storage compartment; and

control means for determining periods of on and off-peak electric use in response to a time of day signal, for activating said compressor alternately in response to cooling demand from said food storage compartment with said evaporator cooling said food storage compartment and heating demand from said water storage compartment with said evaporator cooling ambient air, and for activating said electric heating element in response to one of heating demand from said water storage compartment and a time-of-day signal to bias resistance electric water heating operation toward periods of off-peak electric use.

19. A combined refrigerator-water heating system according to claim 18, wherein said control means controls the resistance electric heating element to preclude simultaneous operation of said compressor and said auxiliary resistance heat during programmable period of on-peak electrical use.

20. A combined refrigerator-water heating system according to claim 18, wherein said control means activates said refrigeration system in response to said time-of-day signal to bias compressor operation toward times of off-peak electrical use, and lowers storage compartment temperature to a controlled off-peak setting below that maintained as an on-peak setting during on-peak electrical use periods.

21. A control means according to claim 20, wherein said storage compartment includes thermal storage media which freezes at a temperature between the off-peak and on-peak controlled storage compartment temperature settings.