DE102007003710A1 - Air i.e. ambient air, dehumidifier for use in e.g. living room, has coolant pipeline guided from exit to cooler, from cooler to pre-cooler and from pre-cooler to boiler, which is arranged between cooler and dry air outlet in air channel - Google Patents

Abstract

The dehumidifier has an air channel (1) with a moist air inlet (2) and a dry air outlet (3), and a cooler (4) e.g. tube coil heat exchanger, arranged between the inlet and the outlet in the channel. A coolant pipeline (7) is provided with an exit (8) and an inflow (9) for a cooling medium. The pipeline is guided from the exit to the cooler, from the cooler to a pre-cooler (5.1) and from the pre-cooler to a boiler (6.1). The pre-cooler is arranged between the air inlet and the cooler in the channel, where the boiler is arranged between the cooler and the air outlet in the channel.

Description

The The invention relates to a device for dehumidifying Air with a cold recovery. Such devices come especially in the dehumidification of indoor air in living rooms, Production rooms, warehouses and other commercial used rooms.

The Elimination of a condensable component from a gas / vapor mixture by falling below the dew point of the condensable component (in the following, a mixture of air and water vapor is assumed) has the disadvantage that in addition to the latent heat (or evaporation enthalpy of the coolant) also sensitive Heat (for the heating of the coolant over the evaporation temperature) absorbed by the refrigerant becomes. However, only the latent part of the heat is for the drying of the air of use. The sensitive share, however, is only carried along, increases the required cooling and chiller performance and operating costs. This adverse effect occurs with decreasing partial pressure of the excreted Steam component amplified. In addition, the Air due to the absorption of sensible heat by the Cooled coolant more than required.

To minimize the latent cooling performance of the dehumidifier, integrated cold recovery has been proposed ( Christoph Kaup in AI Luft- und Kältetechnik 12/2003, pages 561 to 564 ). Here, the actual radiator for the dehumidification of the air is placed between two connected heat exchangers. The "dehumidification cooling potential" is transferred from a heat exchanger downstream of the cooler in the direction of flow of the air to be dehumidified into the downstream heat exchanger, where the dehumidified air is heated and the upstream heat exchanger cools the air flow to be dehumidified Cooling capacity can be reduced.

The known cold recuperation is because of the additional Refrigerant recovery circuit with piping system, Cooling medium, pump, pressure maintenance, protection against overpressure, Pressure gauge, filling, draining and venting devices consuming. The technical implementation of this circulation system is in a wide range of applications - such as mobile Small dehumidifiers up to use in deep-freeze rooms or for low dew points - due to the required Defrost at low temperatures only with some effort realizable.

From that Based on the object of the invention, a less elaborate device for dehumidifying air with cold recovery to provide.

The The object is achieved by a device having the features of the claim 1 solved. Advantageous embodiments of the device are given in the subclaims.

• – eine Vorrichtung zum Führen von Luft mit einem Feuchtlufteintritt und einem Trockenluftaustritt,
• – einen in der Vorrichtung zum Führen der Luft zwischen Feuchtlufteintritt und Trockenluftaustritt angeordneten Kühler,
• – eine Leitung mit einem Eintritt und einem Austritt für Kühlmedium,
• – wobei die Leitung vom Eintritt zum Kühler, vom Kühler zu einem zwischen Feuchtlufteintritt und Kühler in der Vorrichtung zum Führen der Luft angeordneten Vorkühler und vom Vorkühler zu einen zwischen dem Kühler und dem Trockenluftaustritt in der Vorrichtung zum Führen der Luft angeordneten Erhitzer geführt ist.

The inventive device for dehumidifying air has

• A device for guiding air with a moist air inlet and a dry air outlet,
• A cooler arranged in the device for guiding the air between wet air inlet and dry air outlet,
• A conduit with an inlet and an outlet for cooling medium,
• - Wherein the line from the inlet to the radiator, from the radiator to a between humid air inlet and radiator in the device for guiding the air arranged pre-cooler and the precooler is guided to a arranged between the radiator and the dry air outlet in the device for guiding the air heater.

at the device according to the invention takes place Cooling recovery similar to the known circulation system through separate heat exchangers. It is not one, however complete additional refrigerant recovery circuit available. Rather, the already existing cooling medium circuit used, wherein the already existing cooling medium as a transfer medium for the cold recovery serves. The Cooling medium is namely after leaving the Radiator passed through a precooler, the air to be dehumidified before entering the radiator pre-cooling. After leaving the precooler The heated cooling medium is passed through a heater passed through the dehumidifying emerging from the radiator Reheated air. A complete additional System with pipes, cooling medium, pump, pressure maintenance, protection against overpressure, pressure gauge, filling, draining and deaerators deleted. This is possible, because the cooling medium after leaving the radiator actively supplied by the cooling system (in a direct evaporator after evaporation and for regulation required overheating) in the usable temperature range for a cold recovery.

In order to transfer the required amount of heat, the same cooling medium is optionally reciprocated several times between several pre-coolers and several heaters. In this case, the countercurrent principle can be used, as far as the desired degree of cooling recovery requires it. Especially in the vapor phase of refrigerants, the usable enthalpy is small, so that the heat transfer performance by the increase Hung mass flow must be applied. Since the entire cooling coil pack from radiator, pre-cooler and heater is supplied by the same coolant circuit, defrosting of the entire surface by heated cooling medium (with direct evaporators hot gas) is possible.

Of the Advantage of the device according to the invention is in the significant energy savings over conventional ones Procedures that work without cold recovery. Compared to devices for dehumidifying air without cold recovery Although the cost of the device according to the invention because of the additional heat exchanger and the increased costly air flow. A compressor However, a refrigerant circuit can at the same dehumidification performance be made smaller. The total cost can By doing so, staying about the same with the advantage of being clear lower consumption compared to conventional Dehumidifiers without cold recovery. With sinking dew point increases the ratio of the sensitive share to the latent part of the heat, the one to be dehumidified Air is withdrawn. The cold recuperation gets thereby in the range of low relative humidity and in the frozen area a much greater importance. Across from the known dehumidifier with circulation system for cooling recovery the equipment cost is considerably lower, as an additional Cooling recovery circuit is eliminated. Especially before geous is the invention Refrigerant recovery over the known Circulatory system for small mobile or stationary Attachments.

The Air to be dehumidified may be due, for example, to free convection flow through the device for guiding the air. Furthermore, it is possible that the to be dehumidified Air by means of an external fan or blower through conveyed through the device for guiding the air is, so that the heat transfer to Pre-cooler, radiator and heater improved. For this is according to an embodiment of the invention of Device for guiding the air a fan or a Blower for conveying the air from the moist air inlet assigned to the dry air outlet.

For improved cold recovery is according to a Design the line for cooling medium from the heater led to another precooler, in the Device for guiding the air between moist air inlet and cooler is arranged, and the other precooler led to another heater in the device for guiding the air between the radiator and the moist air outlet is arranged. According to another embodiment is to further improve the refrigerant recovery the cooling medium from the other heater to at least one Another arrangement of a further precooler and a led downstream heating another.

The Precoolers are, for example, next to each other in the device arranged to guide the air. The same applies to the heaters. To realize a countercurrent is according to another Design of the additional precooler between damp air inlet and pre-cooler and the other heater between heater and dry air outlet arranged. Accordingly, according to another Embodiment with a further arrangement of a further precooler and another heater the more precooler and the Device for guiding even closer to the moist air inlet and the more heaters in the device for guiding yet further arranged at the dry air outlet.

For the radiator come in various designs. According to one Embodiment, the cooler is a tube coil heat exchanger or a finned tube heat exchanger. For moisture excretion the air is enough to fall below the dew point at the Cooler surface. A shortfall of the dew point the total amount of air is not required. Have finned tube heat exchanger however, starting from the core tubes to the edges of the Ribs raise temperature increases by a few degrees Kelvin. As a result, the sensitive share increases the heat passed, the higher the Proportion of ribs on the total surface is. Prefers Therefore comes for the cooler a coil heat exchanger for use. A pipe coil heat exchanger corresponds essentially a finned tube heat exchanger, however executed without ribs.

For the pre-cooler, the further pre-cooler, the heater and the other heaters may have different heat exchanger designs be used. According to one embodiment is the precooler and / or the additional precooler and / or the heater and / or further heaters a finned tube heat exchanger.

According to one preferred embodiment, the cooling medium is a refrigerant, so that in the cold recovery the Evaporation enthalpy of the cooling medium is available. According to one In another embodiment, the cooling medium is cooling brine or cold water, with only the latent heat of the cooling medium usable for heat transfer and heat transfer is.

The invention relates to embodiments in which the cooling system is open, so that provided for the operation of the device, a cooling medium and supplied to the device and must be discharged again after the heat exchange from the device. According to a preferred Ausgestal The cooling system is closed. According to a further embodiment, the cooling system comprises a compressor, a condenser and a throttle when using refrigerant.

According to one Embodiment for a device with cooling brine or cold water as a cooling medium comprises the cooling system a pump and a cooling device through which the cooling medium Heat is removed to cool the cooling medium. The cooling device is for example a heat exchanger, the to a cooling circuit or to another suitable Cold source is connected.

According to one preferred embodiment is below the radiator and / or the pre-cooler and / or the further pre-cooler a condensate tank and / or a condensed water tank arranged to the condensed water vapor from the air to be dehumidified collect.

According to one further embodiment are all elements of the device combined into a structural unit. The device is positionable in a room to be dehumidified. It is suitable for stationary or mobile versions.

Of the at least one precooler and the at least one heater can be separate components. According to one advantageous embodiment are at least one precooler and at least one heater and / or multiple precoolers and / or multiple heater sections of a single finned tube heat exchanger. This allows a particularly compact design the device.

The Invention is described below with reference to the accompanying drawings of Embodiments explained in more detail. In the drawings show:

1 a device for dehumidifying air in a flow diagram;

2 hx-diagram with the state of the air in the device of 1 ;

3 Mollier-h, lg p-diagram with the state of the refrigerant of the device of 1 ;

4 a device for dehumidifying air in a rough-schematic vertical section;

5 space-saving arrangement of precooler and heater of a device according to the invention in a rough-schematic section.

According to 1 For example, the device for dehumidifying comprises a device for guiding air in the form of an air channel 1 on, which enters a damp air intake 2 and a dry air outlet 3 Has. In the flow chart is the air duct 1 represented with the symbol for a line. The flow direction is at the wet air inlet 2 illustrated by an arrow.

In the air duct 1 is between wet air inlet 2 and dry air outlet 3 a cooler 4 arranged.

In the air duct 1 are between the damp air inlet 2 and the radiator 4 several precoolers 5.1 . 5.2 . 5.3 arranged parallel to each other.

Further, in the device for guiding air between the radiator 4 and the dry air outlet 3 several heaters 6.1 . 6.2 . 6.3 arranged side by side.

The cooler 4 , the precooler 5.1 . 5.2 . 5.3 and the heaters 6.1 . 6.2 . 6.3 are heat exchangers. For the radiator 4 Preferably, a tube coil heat exchanger is used. The precooler 5.1 . 5.2 . 5.3 are preferably finned tube heat exchangers. The heaters 6.1 . 6.2 . 6.3 are also preferred finned tube heat exchangers.

Through a refrigerant line 7 a refrigerant is supplied to the above-mentioned heat exchangers. From an entry 8th for refrigerant, the refrigerant enters the cooler 4 , From the radiator 4 it becomes a precooler 5.1 guided. From the precooler 5.1 it gets to the heater 6.1 , From there it becomes the next precooler 5.2 directed. From there it leads the refrigerant line 7 to the further precooler 5.3 , From this it becomes a further heater 6.3 directed. From the other heater 6.3 it gets through the refrigerant line 7 to an exit 9 for refrigerant.

The refrigerant line 7 is preferably integrated in a refrigerant circuit. For this purpose, the refrigerant from the refrigerant outlet 9 to a compressor, from the compressor to a condenser, from the condenser to a throttle, and from the throttle to the refrigerant inlet 8th guided. Compressor, condenser and throttle are in 1 Not shown.

The air to be dehumidified is on the way from the damp air inlet 2 to dry air outlet 3 dehumidified.

Next to the air duct 1 At various positions, the respective air volume flow (eg 300 m ³ / h at the moist air inlet) is present at different positions 2 ), right next to it the respective temperature in ° C (eg 20 ° C at the moist air inlet) 2 ) and below that the respective water vapor content in g / kg dry air (eg 8.8 g / kg dry air at the entry of moist air 2 ).

It can be seen that the precooler 5.1 . 5.2 . 5.3 reduce the temperature of the humid air by 4.7 ° C. In the cooler 4 The temperature is lowered by a further 7.3 ° C, whereby water vapor condenses. As a result, the water vapor content drops from 8.8 g / kg to 6.7 g / kg.

In the heaters 6.1 . 6.2 . 6.3 the dehumidified air is heated from 8.0 ° C to 12.7 ° C.

For these changes in state will occur at the refrigerant inlet a suitable volume flow of a refrigerant (eg R 134a) at a suitable temperature.

The refrigerant is first the radiator 4 fed there to cause the condensation of water vapor. In this case, the refrigerant evaporates and is overheated. The temperature of the superheated refrigerant vapor is deep enough for a pre-cooling of a partial flow of the air to be dehumidified before the radiator 4 , For this purpose, the evaporated refrigerant is the precooler 5.1 fed. There, the refrigerant is further overheated or the temperature of the vaporized refrigerant increased so that it is to heat a partial stream of the dehumidified air behind the radiator 4 can be used. For this purpose, the superheated refrigerant vapor to the heater 6.1 fed. There, the evaporated refrigerant cools in the heating of the dried air so far that it can be used again for pre-cooling of a further partial flow of the air to be dried. This happens in the further precooler 5.2 , There it takes on the precooling turn heat, which in the other heater 6.2 is used for reheating a further partial flow of the dried air. There, the evaporated refrigerant is cooled again, so that it is in the further pre-cooler 5.3 a pre-cooling of a further partial flow of the air to be dehumidified causes. The resulting heating of the vaporized refrigerant is in turn used to heat a further partial stream of the dehumidified air in the further heater 6.3 used.

The refrigerant can basically be between any number of pre-coolers 5 and warming 6 be led back and forth. The number of passes depends on the desired cold recovery.

The state course of the air is in the hx diagram ( 2 ). The air to be dehumidified is in the moist air inlet 2 state A. During precooling it undergoes a change of state according to line a. At the exit of the precooler 5.1 . 5.2 . 5.3 she has reached the state B

In the cooler 4 a state change takes place according to line b until the air reaches state C at the exit from the radiator 4 reached. In the heaters 6.1 . 6.2 . 6.3 Finally, the state of the air changes according to line c. In the dry air outlet 3 the air has reached the state D

The state changes of the refrigerant in the refrigeration cycle are in the Mollier-h, lg p diagram ( 3 ). In the refrigerant inlet 8th the refrigerant has the condition A. In the cooler 4 a state change takes place along the isobars a until complete evaporation at B and overheating along b to C. In state C, the coolant exits the cooler 4 out.

In the precooler 5.1 a state change along c is passed from C to D. In the heater 6.1 this state change is reversed from D to C. These state changes are repeated in the further arrangements of pre-coolers 5.2 . 5.3 and heaters 6.2 . 6.3 ,

At the refrigerant outlet 9 the refrigerant is in state C Upon subsequent compression in a compressor, its condition changes along line d until state E is reached.

In a condenser, a state change takes place along an isobar from state E to F. During the subsequent throttling, the state changes along the line f from F to A. At state A, the refrigerant is re-introduced into the refrigerant 8th fed.

8th shows a compact embodiment of the device according to the invention, which is particularly suitable for use as a small mobile device or stationary device. The device has a housing 10 with a moist air inlet 2 and a dry air outlet 3 , In between is in the case 10 an air duct 1 available.

In the air duct 1 are starting from the moist air inlet 2 one after the other at least one precooler 5 , the cooler 4 and at least one heater 6 available.

Parallel to the air duct 1 is another air channel 11 for additional cooling air available. Further, in the housing is a capacitor 12 arranged the refrigerant circuit. In front of the condenser 12 open the air duct 1 and the further air channel 11 ,

Behind the capacitor 12 is before the dry air outlet 3 a fan 13 arranged.

Further, in the housing are a throttle 14 and a compressor 15 of the refrigerant circuit present.

Below the one pre-cooler 5 and of cooler 4 is a condensed water tank 16 arranged.

The compressor 15 has an electric drive motor. In addition, not shown in the housing electrical supply, control and regulating devices are present.

The ventilator 13 sucks air to be dehumidified through the entry of moist air 2 and pushes them through the dry air outlet 3 out of the case 10 out. This takes place in the air duct 1 the dehumidification of the air in the manner described above. The through the other air duct 11 guided partial air flow is used to condense the refrigerant in the condenser 12 used. The temperature of the air exiting the at least one heater 6 namely, is greater than the air inlet temperature in the condenser 12 a conventional dehumidifier. This is compensated by the additional amount of cooling air that flows through the additional air duct 11 to the capacitor 12 is introduced. By means of suitable throttle devices, the partial volume flows of the air, which are on the air duct 1 and the additional air duct 11 omitted, adjust if necessary.

In the execution of 5 become pre-coolers 5 and heaters 6 through a single coil heat exchanger 17 realized. This is horizontal or vertical through a baffle 18 divided into two sections. The air to be dried passes from the moist air inlet 2 by the as precooler 5 serving part of the pipe coil heat exchanger 17 to the radiator 4 , From there, the dried air is passed through the heater 6 serving part of the same coil heat exchanger 17 through to the dry air outlet 3 guided.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited non-patent literature

• - Christoph Kaup in AI Luft- und Kältetechnik 12/2003, pages 561 to 564 [0003]

Claims (14)

Device for dehumidifying air with - a device for guiding air ( 1 ) with a moist air inlet ( 2 ) and a dry air outlet ( 3 ), - one in the device for guiding the air ( 1 ) between wet air inlet ( 2 ) and dry air outlet ( 3 ) arranged cooler ( 4 ), - a line ( 7 ) with an entrance ( 8th ) and an exit ( 9 ) for cooling medium, - wherein the line ( 7 ) from the entrance ( 8th ) to the cooler ( 4 ), from the radiator ( 4 ) to a between humid air inlet ( 2 ) and cooler ( 4 ) in the device for guiding the air ( 1 ) arranged pre-cooler ( 5.1 ) and the precooler ( 5.1 ) to one between the radiator ( 4 ) and the dry air outlet ( 3 ) in the device for guiding the air ( 1 ) heaters ( 6.1 ) is guided. Device according to Claim 1, in which the device for guiding the air ( 1 ) a fan ( 13 ) or blower for conveying the air from the moist air inlet ( 2 ) to dry air outlet ( 3 ) assigned. Device according to Claim 1 or 2, in which the line ( 7 ) for cooling medium from the heater ( 6.1 ) to another pre-cooler ( 5.2 ) guided in the device for guiding the air ( 1 ) between wet air inlet ( 2 ) and cooler ( 4 ), and from the further pre-cooler ( 5.2 ) to another heater ( 6.2 ) guided in the device for guiding the air ( 1 ) between radiator ( 4 ) and moist air outlet ( 3 ) is arranged. Device according to Claim 3, in which the line ( 7 ) for the cooling medium from the further heater ( 6.2 ) to at least one further arrangement from a further precooler ( 5.3 ) and a downstream further heater ( 6.3 ) is guided. Device according to one of claims 1 to 4, wherein the cooler ( 4 ) is a coiled tube heat exchanger or a finned tube heat exchanger. Device according to one of claims 1 to 5, wherein the precooler ( 5.1 ) and / or the further precooler ( 5.2 . 5.3 ) and / or the heater ( 6.1 ) and / or the further heaters ( 6.2 . 6.3 ) is a finned tube heat exchanger. Device according to one of claims 1 to 6, in which the cooling medium is a refrigerant. Device according to one of claims 1 to 7, in which the cooling medium is brine or cold water. Device according to one of claims 1 to 8, where the cooling system is closed. Apparatus according to claim 9, wherein the cooling system comprises a compressor ( 15 ), a capacitor ( 12 ) and a throttle ( 14 ). Device according to one of claims 1 to 8, where the cooling system is open. Device according to one of claims 1 to 11, wherein below the radiator ( 4 ) and / or the pre-cooler ( 5.1 ) and / or the further pre-cooler ( 5.2 . 5.3 ) a condensation water tank and / or a condensed water tank ( 16 ) is arranged. Device according to one of claims 1 to 12, in which all elements to a structural unit are summarized. Device according to one of claims 1 to 13, wherein at least one precooler ( 5 ) and at least one heater ( 6 ) Sections of a single finned tube heat exchanger ( 17 ), which are separated by at least one partition ( 18 ) various sections of the device for guiding the air ( 1 ) assigned.