NZ796202B2 - Vapor Pressure Control System - Google Patents
Vapor Pressure Control SystemInfo
- Publication number
- NZ796202B2 NZ796202B2 NZ796202A NZ79620218A NZ796202B2 NZ 796202 B2 NZ796202 B2 NZ 796202B2 NZ 796202 A NZ796202 A NZ 796202A NZ 79620218 A NZ79620218 A NZ 79620218A NZ 796202 B2 NZ796202 B2 NZ 796202B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- control loop
- error value
- conditioned space
- cooling
- cooling capacity
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
- A23B11/00—Preservation of milk or dairy products
- A23B11/60—Preservation of cheese or cheese preparations
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
- A23B2/00—Preservation of foods or foodstuffs, in general
- A23B2/003—Control or safety devices for sterilisation or pasteurisation systems
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
- A23B4/00—Preservation of meat, sausages, fish or fish products
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
- A23B4/00—Preservation of meat, sausages, fish or fish products
- A23B4/03—Drying; Subsequent reconstitution
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; PREPARATION THEREOF
- A23C19/00—Cheese; Cheese preparations; Making thereof
- A23C19/14—Treating cheese after having reached its definite form, e.g. ripening or smoking
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
-
- 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
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/042—Air treating means within refrigerated spaces
-
- 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
- F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
- F25D2317/04—Treating air flowing to refrigeration compartments
- F25D2317/041—Treating air flowing to refrigeration compartments by purification
- F25D2317/0411—Treating air flowing to refrigeration compartments by purification by dehumidification
- F25D2317/04111—Control means therefor
-
- 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
- F25D2700/10—Sensors measuring the temperature of the evaporator
-
- 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
-
- F26B21/08—
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
Abstract
system to control the conditions of an aging room for food in which independent feedback loops control the dry bulb temperature and the dew point while controlling the difference between the vapor pressure in the room and the vapor pressure of the food stuff being aged, thereby controlling the "aging" of the food stuff and its quality.
Claims (14)
1. A method for processing a food product having a moisture content and a specific vapor pressure, said food product being located within a conditioned space, the method comprising: controlling rate of moisture extraction from the food product by controlling dry bulb temperature in the conditioned space and controlling partial vapor pressure in the conditioned space, wherein the dry bulb temperature is controlled with a first control loop, and the partial vapor pressure is controlled with a second control loop, and wherein the conditioned space includes a cooling coil, wherein a controller controls air flow over the cooling coil and coolant flow into the cooling coil to control sensible heat and latent heat removal from the conditioned space, wherein the first control loop sends signals to the controller to control air flow over the cooling coil to control cooling capacity of the cooling coil, and the second control loop sends signals to the controller to control flow of coolant into the cooling coil to control cooling capacity of the cooling coil.
2. The method of claim 1, wherein the first control loop controls cooling capacity in the conditioned space based on a first error value calculated from a dry bulb temperature value from the conditioned space and a dry bulb set point value, and wherein the second control loop controls cooling capacity in the conditioned space based on a second error value calculated based on a dew point value from the conditioned space and a dew point set point value.
3. The method of claim 2, wherein when the first error value is positive and is increasing cooling capacity is increased, when the first error value is positive and is decreasing cooling capacity is decreased, and when the first error value is negative the conditioned space is heated.
4. The method of claim 2, wherein when the second error value is positive and is increasing rate of moisture removal from the conditioned space is increased, when the second error value is positive and is decreasing rate of moisture removal from the conditioned space is decreased, and when the second error value is negative moisture is added to the conditioned space.
5. The method of claim 2, further comprising increasing cooling capacity of the second control loop in order to avoid cooling interruption by the first control loop when the second error value is zero or close to zero but the first error value is positive.
6. The method of claim 2, further comprising periodically increasing the cooling capacity of the second control loop in order to avoid cooling interruption of the first control loop when the second error value is zero or close to zero but the first error value is positive.
7. The method of claim 2, further comprising increasing cooling capacity of the second control loop in order to avoid cooling interruption by the first control loop when the second error value is zero or close to zero but the first error value is positive by providing a bias signal to a signal sent by the second control loop.
8. The method of claim 2, further comprising periodically increasing the cooling capacity of the second control loop in order to avoid cooling interruption of the first control loop when the second error value is zero or close to zero but the first error value is positive by providing an offset to output of the cooling coil.
9. The method of claim 8, further comprising terminating periodically increasing cooling capacity when dew point in the conditioned space has dropped by an unacceptable amount.
10. The method of claim 1, wherein air flow is controlled with a fan or a damper.
11. The method of claim 1, wherein the coolant flow is controlled with a valve.
12. The method of claim 2, wherein the set point values are based on a psychometric chart or equation.
13. The method according to claim 1, wherein each control loop is a feedback loop with proportional integrative and derivative properties.
14. The method according to claim 1, wherein each control loop is a feedback loop with proportional integrative and derivative properties.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15/414,716 US10674752B2 (en) | 2016-02-04 | 2017-01-25 | Vapor pressure control system |
| NZ755681A NZ755681B2 (en) | 2018-01-24 | Vapor pressure control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ796202A NZ796202A (en) | 2025-03-28 |
| NZ796202B2 true NZ796202B2 (en) | 2025-07-01 |
Family
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