NZ776627B2 - Thermal control system - Google Patents
Thermal control system Download PDFInfo
- Publication number
- NZ776627B2 NZ776627B2 NZ776627A NZ77662719A NZ776627B2 NZ 776627 B2 NZ776627 B2 NZ 776627B2 NZ 776627 A NZ776627 A NZ 776627A NZ 77662719 A NZ77662719 A NZ 77662719A NZ 776627 B2 NZ776627 B2 NZ 776627B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- enclosed space
- time
- temperature
- schedule
- refrigeration system
- Prior art date
Links
- 238000005057 refrigeration Methods 0.000 claims abstract 35
- 238000001816 cooling Methods 0.000 claims abstract 5
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 claims 1
- 150000002500 ions Chemical class 0.000 claims 1
- 238000000034 method Methods 0.000 abstract 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/19—Calculation of parameters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D13/00—Stationary devices, e.g. cold-rooms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2500/00—Problems to be solved
- F25D2500/04—Calculation of parameters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/12—Sensors measuring the inside temperature
- F25D2700/123—Sensors measuring the inside temperature more than one sensor measuring the inside temperature in a compartment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1917—Control of temperature characterised by the use of electric means using digital means
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1919—Control of temperature characterised by the use of electric means characterised by the type of controller
- G05D23/1923—Control of temperature characterised by the use of electric means characterised by the type of controller using thermal energy, the cost of which varies in function of time
Abstract
The subject matter of this specification can be embodied in, among other things, a method for time shifting when a cold storage facility is cooled that includes determining a thermal model of a cold storage facility, obtaining an energy cost model that describes a schedule of variable energy costs over a predetermined period of time in the future, determining an operational schedule for at least a portion of a refrigeration system based on the thermal model, the energy cost model, and a maximum allowed temperature, and powering on the portion the refrigeration system based on the operational schedule, cooling, by the powered portion of the refrigeration system to a temperature below the maximum allowed temperature, reducing power usage of the powered portion of the refrigeration system based on the operational schedule, and permitting the facility to be warmed by ambient temperatures toward the maximum allowed temperature.
Claims (20)
1. A cold storage facility comprising: a cold storage enclosure defining an enclosed space; a refrigeration system configured to cool the enclosed space; and a control system comprising: a data processing tus; and a memory device storing instructions that when executed by data processing apparatus cause the control system to perform operations comprising: obtaining an energy demand model, the energy demand model including a schedule of an energy demand over a ermined period of time in the future; obtaining a ics schedule for the enclosed space that identifies inventory expected to arrive at or be distributed from the cold storage facility over the predetermined period of time in the future; determining an amount of heat energy to be added to the ed space by the ics schedule over the predetermined period of time in the future; determining an operational schedule for at least a portion of the refrigeration system based on the energy demand model and the determined amount of heat energy for the logistics schedule, and a maximum allowed temperature for the enclosed space, wherein the operational schedule identifies, at least, (i) a target ature nt to which the enclosed space is to be cooled to maintain a temperature below the maximum allowed ature while the refrigeration system is deactivated, and (ii) a time schedule identifying, at least, a first time at which the refrigeration system is activated to reach the target ature setpoint, a second time at which the refrigeration system is adjusted, and a third time at which the refrigeration system is scheduled to be resumed to reach the target temperature setpoint; powering on, at the first time, the at least a portion of the refrigeration system based on the operational schedule; cooling, by the powered at least a portion of the refrigeration Attorney : 41979-0025001 system, the enclosed space to the target ature setpoint below the maximum allowed temperature; reducing, at the second time, power usage of the powered at least a portion of the eration system based on the operational schedule; permitting the ed space to be warmed toward the maximum allowed temperature; and reactivating, at the third time, the at least a portion of the refrigeration system to maintain the enclosed space below the maximum allowed temperature.
2. The cold storage ty of claim 1, wherein cooling the enclosed space comprises: cooling, from the first time to the second time, the enclosed space to the target temperature setpoint below the m allowed temperature by powering on the at least a portion of the refrigeration system.
3. The cold storage facility of claim 2, wherein permitting the enclosed space to be warmed toward the maximum allowed temperature comprises: permitting, from the second time to the third time, the enclosed space to be warmed toward the maximum allowed temperature by reducing power usage of the powered at least a portion of the refrigeration system.
4. The cold storage facility of claim 1, wherein permitting the enclosed space to be warmed toward the maximum allowed temperature comprises: permitting the enclosed space to be warmed by ambient atures toward the maximum allowed temperature.
5. The cold e facility of claim 1, wherein permitting the enclosed space to be warmed toward the maximum allowed temperature comprises: permitting the enclosed space to be warmed by ambient atures toward the m allowed temperature while the logistics schedule is performed. Attorney Docket: 41979-0025001
6. The cold storage ty of claim 1, n reactivating the at least a portion of the refrigeration system ses: reactivating, at the third time, the at least a portion of the refrigeration system to maintain the enclosed space below the m allowed temperature after the logistics schedule has been performed while the at least a portion of eration system was deactivated.
7. The cold storage facility of claim 1, wherein the target temperature setpoint is configured as a ature setpoint to which the ed space is to be cooled to maintain a temperature below the maximum allowed temperature while the logistics schedule is performed and while the at least a portion of the refrigeration system is deactivated.
8. The cold storage facility of claim 1, the operations further comprising: determining a measured temperature of the enclosed space; and powering on at least a portion of the refrigeration system based on the determined measured temperature and a predetermined threshold temperature value that is less than the maximum allowed temperature.
9. The cold storage facility of claim 1, the operations further comprising: determining a thermal model of the enclosed space, n determining the operational le includes: determining the operational schedule for at least the portion of the refrigeration system based on the thermal model, the determined amount of heat energy for the logistics le, and the maximum allowed temperature for the enclosed space.
10. The cold storage facility of claim 1, the operations further comprising: obtaining an energy cost model, wherein determining the operational schedule includes: Attorney Docket: 41979-0025001 determining the ional schedule for at least the portion of the refrigeration system based on the energy cost model, the determined amount of heat energy for the logistics le, and the maximum allowed temperature for the enclosed space.
11. The cold storage facility of claim 9, n the thermal model is representative of at least one of a thermal capacity of content within the enclosed space or a thermal resistance of the cold storage enclosure.
12. The cold storage facility of claim 10, n determining an operational schedule based on the energy cost model, the determined amount of heat energy for the logistics schedule, and the maximum allowed temperature for the enclosed space comprises: identifying, based on the energy cost model, a first period of time during which energy costs a first amount per unit; identifying, based on the energy cost model, a second period of time ing the first period of time, during which energy costs a second amount per unit that is less than the first amount per unit; adding information descriptive of the second period of time to the operational schedule, the information being representative of time during which the refrigeration system is to be powered on to cool the ed space below the maximum allowed temperature; and adding information descriptive of the first period of time to the operational schedule, the information being representative of time during which the enclosed space is allowed to warm toward the maximum allowed temperature.
13. The cold storage facility of claim 9, wherein determining a thermal model of the enclosed space comprises: ng on the portion the refrigeration system based on the operational schedule; cooling, by the powered portion of the refrigeration system, the enclosed space to a temperature below the maximum d temperature; Attorney Docket: 41979-0025001 ng power usage of the d portion of the refrigeration system based on the operational schedule; determining a first plurality of temperature levels sensed by a plurality of temperature sensors; permitting the enclosed space to be warmed by ambient atures toward the maximum allowed temperature; determining a second plurality of temperature levels sensed by the plurality of temperature sensors; and determining a thermal capacity of content of the enclosed space.
14. A cold storage management computer system for shifting times when a cold storage facility is , the cold storage management computer system comprising: a data processing apparatus; and a memory device g instructions that when executed by data processing apparatus cause the cold storage management computer system to perform ions comprising: receiving, from a control system, a request for an operational schedule for at least a portion of the eration system; obtaining a logistics schedule for an ed space of the cold storage facility, the logistics schedule identifying inventory expected to arrive at or be distributed from the cold storage facility over the ermined period of time in the future; determining an amount of heat energy to be added to the enclosed space by the logistics le over the predetermined period of time in the future; determining an operational schedule for at least a portion of the refrigeration system based on the determined amount of heat energy for the logistics schedule, and a maximum allowed temperature for the enclosed space, wherein the operational schedule identifies, at least, (i) a target temperature setpoint to which the enclosed space is to be cooled to in a ature below the maximum allowed temperature while the refrigeration system is deactivated, and (ii) a time schedule identifying, at least, a first time at which the refrigeration system is activated to reach the target temperature setpoint, a second time at which the refrigeration system is adjusted, Attorney Docket: 41979-0025001 and a third time at which the refrigeration system is scheduled to be resumed to reach the target temperature setpoint; and providing, in response to the request, the operational schedule.
15. The cold storage management computer system of claim 14, wherein the operational schedule is configured such that the at least a portion of the refrigeration system is d on from the first time to the second time to cool the enclosed space to the target temperature setpoint below the maximum allowed temperature.
16. The cold storage management computer system of claim 15, wherein the operational schedule is configured such that power usage of the at least a portion of the refrigeration system is d from the second time to the third time to permit the enclosed space to be warmed toward the maximum allowed temperature.
17. The cold storage management er system of claim 14, wherein the operational schedule is configured such that the enclosed space is permitted to be warmed by ambient temperatures toward the maximum allowed temperature.
18. The cold e ment computer system of claim 14, wherein the operational schedule is configured such that the enclosed space is ted to be warmed by ambient temperatures toward the maximum allowed temperature while the ics le is performed.
19. The cold storage management computer system of claim 14, wherein the operational schedule is configured such that the at least a portion of the refrigeration system is reactivated at the third time to maintain the enclosed space below the maximum allowed temperature after the logistics schedule has been performed while the at least a portion of eration system was deactivated. Attorney Docket: 41979-0025001
20. The cold storage ment computer system of claim 14, wherein the target temperature setpoint is configured as a ature setpoint to which the enclosed space is to be cooled to maintain a temperature below the maximum allowed temperature while the logistics schedule is performed and while the at least a portion of the refrigeration system is deactivated. Warehouse Refrigeration Inventory Other Info Provider(s) ‘~~~~~~~~~~
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NZ811129A NZ811129B2 (en) | 2019-05-30 | Thermal control system |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15/993,259 US10323878B1 (en) | 2018-05-30 | 2018-05-30 | Thermal control system |
| US16/413,309 US11181316B2 (en) | 2018-05-30 | 2019-05-15 | Thermal control system |
| NZ771638A NZ771638B2 (en) | 2018-05-30 | 2019-05-30 | Thermal control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ776627A NZ776627A (en) | 2024-07-05 |
| NZ776627B2 true NZ776627B2 (en) | 2024-10-08 |
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