DE102006045276A1 - Ventilation device for ventilation chamber for humidification of e.g. hop, has control unit determining absolute humidity from relative humidity and temperature, and closing devices controlled, such that absolute humidity is adjusted - Google Patents

Abstract

The device has an air mixing chamber for mixing of air of two different supply air sources, and a fan for blowing the air mixture from the supply air sources into a ventilation chamber. A humidity measuring sensor detects relative humidity of the air mixture, and a temperature measuring sensor detects temperature of the mixture. A control unit determines absolute humidity from the relative humidity and the temperature. Closing devices are controlled according to a reference value for the absolute humidity, such that the desired absolute humidity of the mixture is adjusted accordingly. An independent claim is also included for a method for humidification of harvested crop in a ventilation chamber.

Description

The The invention relates to a ventilation device for one aeration chamber for moistening crops and a method of moistening of crop.

crop, especially hops, achieved on the market depending on its absolute humidity different prices. For drying or moistening crops This is therefore in ventilation chambers before whose sale is ventilated, where humid or dry air is supplied.

At the However, the state of the art only measures the relative humidity and taken into account when adjusting the degree of moisture, which is not optimal Results brings.

task The invention provides an improved ventilation device for a ventilation chamber and a method for moistening crops available in which the absolute humidity is adjustable.

These Task is by a ventilation device according to the features of claim 1 and a method for moistening of crop according to the features of claim 10.

According to the invention is a Air mixing chamber for mixing air from at least two different Supply air sources provided, the supply air sources via closure devices metered openable are, being a fan is present that the mixed air from the two supply air sources in the ventilation chamber as ventilation supply air blows, wherein a humidity measuring sensor is provided for detecting the relative humidity of the mixed air, wherein a temperature measuring sensor for detecting the temperature of Mixed air is provided, wherein a control unit is provided, Which of the relative humidity and the temperature is the absolute Humidity determined and according to a setpoint for the absolute humidity accordingly the closure devices controls such that the desired absolute Humidity of the mixed air sets accordingly. This is special effective way the loading or Dehumidification of the crop in the ventilation device associated aeration chamber allows.

preferably, is a supply air source, the exhaust air from one of the ventilation device associated aeration chamber. This exhaust air is also called circulating air.

A Another preferred embodiment of the invention provides that a Supply air source the outside air and / or the Darrabluft a crop drying plant is. These are often more humid than the circulating air, which is why these are very suitable is to be added. The so-called Darrabluft is the moist warm Exhaust air of a crop drying plant, in particular for hops, which is normally found in the vicinity of a ventilation chamber.

The Closure devices are according to an advantageous development the invention, in particular by a linkage or a gear, controlled in opposite directions. That that, for example, a flap completely closed, the other completely open is; at half position, both are half open.

A Variant of the invention provides that the measuring sensors in the ventilation chamber are arranged.

A likewise advantageous variant of the invention provides that measuring sensors in a ventilation duct behind the blower are arranged. Of advantage these also in addition be provided to the first-mentioned sensors.

From Advantage is the control unit by a proportional-integral-differential controller (PID controller) is formed. This is in a technically reliable manner and way a scheme allows.

preferably, is a control unit for the Control unit provided over the setpoint can be set.

To An advantageous variant of the invention is a cooling device provided by means of which the first and / or second supply air the supply air sources cooled can be.

From Advantage is a recirculation mode and mixed air operation through a switch "operation Mixed air "" operation Recirculation "manually switchable.

• – Absaugen der Abluft aus der Belüftungskammer,
• – Einleiten der Abluft in eine Luftmischkammer als eine erste Zuluft,
• – Messen der absoluten Feuchte der Mischluft in dem Belüftungskanal,
• – Zuleiten von einer zweiten Zuluft in die Luftmischkammer in der Menge, bis sich eine gewünschte absoluten Feuchte als Messwert einstellt,
• – Einblasen der Mischluft als Zuluft in die Belüftungskammer,
• – Messen der absoluten Feuchte der Mischluft in dem Belüftungskanal und/oder der Belüftungskammer.

According to a further aspect of the invention, a method for moistening crop material, in particular hops, in a ventilation chamber is proposed, which is characterized by the following method steps:

• - exhausting the exhaust air from the ventilation chamber,
• Introducing the exhaust air into an air mixing chamber as a first supply air,
• Measuring the absolute humidity of the mixed air in the ventilation duct,
• Supplying a second supply air into the air mixing chamber in the quantity until a desired absolute humidity is established as the measured value,
• Blowing in the mixed air as supply air into the ventilation chamber,
• - Measuring the absolute humidity of the mixed air in the ventilation duct and / or the ventilation chamber.

A Embodiment of the method provides that the first and second Incoming air in opposite directions is controlled.

From Advantage is provided after the first process step that the air the ventilation chamber is pumped until the measured value of the absolute humidity does not change anymore.

preferably, is at too high a temperature of the exhaust air and / or the second supply air these cooled.

From Advantage is for the method is a ventilation device according to one of the claims 1 to 9 used.

Further advantageous embodiments will become apparent from the other dependent claims or their possible Subcombinations.

following the invention will be further explained with reference to the drawings. in the Individual shows the schematic representation in:

1 a schematic representation of a ventilation device according to the invention.

The in the figures, the same reference numerals designate the same or the same acting elements.

The sole FIGURE shows an exemplary ventilation device 1 for a ventilation chamber 8th for moistening crops.

As a first supply air source 3 is the exhaust air from the associated ventilation chamber 8th (Circulating air) used and as a second supply air source 4 the outside air with the example of the Darrabluft 4b ,

These are in an air mixing chamber 2 for mixing the air of the supply air sources 3 . 4 fed. The supply air sources are via closure devices 31 . 41 metered openable.

The closure devices are formed in the example by flaps, which by means of a motor control 65 are adjustable.

A fan 7 blows the mixed air 2a from the supply air 3a and 4a the supply air sources 3 . 4 into the ventilation chamber as ventilation supply air 5 ,

A humidity measuring sensor 61 for detecting the relative humidity and a temperature measuring sensor 62 for detecting the temperature of the mixed air 2a are in a ventilation duct 51 behind the blower 7 arranged and a control unit 6 which determines the absolute humidity from the measured values. The control unit is formed by a proportional-integral-derivative controller (PID controller).

According to a setpoint for the absolute humidity then the closure devices 31 . 41 via the motor control 65 and the associated linkage 63 set such that the desired absolute humidity of the mixed air 2a sets accordingly. The closure devices 31 . 41 are in the example about the linkage 63 controlled in opposite directions.

The setpoint is via an operating unit 64 set or entered via a keyboard. Accordingly, a display display can be provided on the operating unit, at which the current and the entered values are displayed.

at the humidifying operation, the ventilation chamber is only in recirculation mode operated, ie with closed second supply air (outside air), until the absolute humidity (measured in the aeration chamber or the supplying ventilation duct) does not change in a certain amount of time.

is the temperature higher as a defined temperature range is determined by cooling (cooling device not shown) of the intake air, the temperature to a Advantageous Tempe ratur span lowered by the optimum temperature range to achieve moistening.

Lies the instantaneous absolute humidity below the set value is caused by the control in mixed air mode humid DRAFT air or Outside air added until the desired Setpoint is reached. Subsequently is automatically ventilated again in recirculation mode, ie without outside air as the second supply air, the process is started again as in the upper paragraph.

Changes after recirculation mode, the absolute humidity in the ventilation duct to the ventilation chamber while a defined period of time, the function will be moistened automatically ended.

The desired Absolute humidity can be 9-10 g / kg.

1

aeration device

2

Air mixing chamber

2a

mixed air

3

Zuluftquelle

3a

first supply air

31

closure device

4

Zuluftquelle

4a

second supply air

4b

Darrabluft

41

closure device

5

Ventilation air supply

51

ventilation duct

6

control unit

61

Humidity measuring sensor

62

Temperature-measuring sensor

63

linkage

64

operating unit

65

motor control

7

fan

8th

aeration chamber

Claims (14)

Ventilation device ( 1 ) for a ventilation chamber ( 8th ) for moistening crop, characterized in that an air mixing chamber ( 2 ) for mixing air from at least two different supply air sources ( 3 . 4 ) is provided, wherein the supply air sources via closure devices ( 31 . 41 ) are metered openable, with a blower ( 7 ) that the mixed air from the two supply air sources ( 3 . 4 ) in the aeration chamber ( 8th ) as ventilation supply air ( 5 ), whereby a humidity measuring sensor ( 61 ) is provided for detecting the relative humidity of the mixed air, wherein a temperature measuring sensor ( 62 ) is provided for detecting the temperature of the mixed air, wherein a control unit ( 6 ) is provided, which determines the absolute humidity from the relative humidity and the temperature and according to a setpoint for the absolute humidity according to the closure devices ( 31 . 41 ) controls such that the desired absolute humidity of the mixed air adjusts accordingly. Ventilation device according to claim 1, characterized in that a supply air source ( 3 ) the exhaust air from a ventilation device associated ventilation chamber ( 8th ). Ventilation device according to claim 1 or 2, characterized in that a supply air source ( 4 ) the outside air and / or the draft air ( 4b ) is a crop drying plant. Ventilation device according to one of claims 1 to 3, characterized in that the closure devices ( 31 . 41 ), in particular by a linkage ( 63 ) or a gear, are controlled in opposite directions. Ventilation device according to one of claims 1 to 4, characterized in that the measuring sensors ( 61 . 62 ) in the aeration chamber ( 8th ) are arranged. Ventilation device according to one of claims 1 to 5, characterized in that the measuring sensors ( 61 . 62 ) in a ventilation channel ( 51 ) behind the blower ( 7 ) are arranged. Ventilation device according to one of the preceding claims, characterized in that the control unit ( 6 ) is formed by a proportional-integral-derivative (PID) controller. Ventilation device according to one of the preceding claims, characterized in that a control unit ( 64 ) for the control unit ( 6 ) is provided, via which the desired value can be set. aeration device according to one of the preceding claims, characterized in that a cooling device is provided, by means of which the first and / or the second Supply air of the supply air sources cooled can be. Method for moistening crop material, in particular hops, in a ventilation chamber, characterized by the method steps: - sucking off the exhaust air from the aeration chamber ( 8th ), - introducing the exhaust air into an air mixing chamber ( 2 ) as a first supply air ( 3a ), - measuring the absolute humidity of the mixed air ( 2a ) in the ventilation duct ( 51 ), - supply of a second supply air ( 4a ) into the air mixing chamber ( 2 ) in the amount until a desired absolute humidity is set as the measured value, - blowing in the mixed air ( 2a ) as supply air into the ventilation chamber ( 8th ), - measuring the absolute humidity of the mixed air in the ventilation duct ( 51 ) and / or the aeration chamber ( 8th ). Method for moistening crop according to claim 10, characterized in that the first and second supply air ( 3a . 4a ) is controlled in opposite directions. Method for moistening crop according to claim 10 or 11, characterized in that in a first method step the air of the aeration chamber is pumped until the measured value of the absolute humidity does not change anymore. Method for moistening crop material after a the claims 10 to 12, characterized in that at too high a temperature the exhaust air (first supply air) and / or the second supply air is cooled. Method for moistening crop according to one of claims 10 to 13, that a ventilation device ( 1 ) is used according to one of claims 1 to 9.