DE202006020351U1 - Ventilation device for moistening crops - Google Patents

Abstract

Ventilation device (1) for a ventilation chamber (8) for moistening crops,
wherein an air mixing chamber (2) is provided for mixing air from at least two different supply air sources (3, 4), wherein the supply air sources can be opened in a metered manner via closure devices (31, 41),
wherein a fan (7) is provided, that the mixed air from the two supply air sources (3, 4) blows into the ventilation chamber (8) as a ventilation supply air (5),
wherein a humidity measuring sensor (61) is provided for detecting the relative humidity of the mixed air,
characterized,
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 sets accordingly ,

Description

The The invention relates to a ventilation device for one aeration chamber for moistening crops.

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.

From the DE 201 03 191 U a ventilation device for a ventilation chamber for humidifying crops is known, with an air mixing chamber whose supply air sealing devices are dosed openable, wherein a fan is present, that the mixed air blows the ventilation chamber, wherein a humidity measuring sensor is provided for detecting the relative humidity of the mixed air ,

task The invention relates to an improved ventilation device for a ventilation chamber for disposal to provide, in which the absolute humidity is adjustable.

These Task is by a ventilation device solved according to the features of claim 1.

Draws according to the invention the ventilation device for one aeration chamber for moistening crop, with an air mixing chamber for mixing provided by air from at least two different supply air sources is, with the supply air sources over Closing devices are metered openable, with a fan available is that the mixed air from the two supply air sources into the ventilation chamber as ventilation supply air blows, wherein a humidity measuring sensor for detecting the relative humidity the mixing air is provided, characterized in that a temperature measuring sensor is provided for detecting the temperature of the mixed air, wherein a control unit is provided, which from the relative humidity and the temperature determines the absolute humidity and after a Setpoint for the absolute humidity corresponding to the closure devices such Controls that the desired Absolute humidity of the mixed air sets accordingly. hereby is in a particularly effective way, the humidification 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.

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 temperature range 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 (9)

Ventilation device ( 1 ) for a ventilation chamber ( 8th ) for moistening crops, wherein 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 ) for recording the relative humidity of the mixed air is provided, characterized in that 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.