DE102018213274B4 - Air conditioning device and method for operating an air conditioning device - Google Patents

Abstract

Air conditioner with a device housing 1 with an exhaust air opening 11, air supply opening 12, exhaust air opening 13 and outside air opening 14, an air supply and exhaust air fan 21, 22, in recirculation mode of an outside air exhaust air flow (AU-FO) and exhaust air supply air flow (AB-ZU) one behind the other and in outdoor air operation of the exhaust air-exhaust air flow (AB-FO) and outdoor air-supply air flow (AU-ZU) arranged one above the other cross-flow heat exchangers 31, 32 in the flow paths of the outside air-supply air flow (AU-ZU) and the exhaust air-exhaust air flow (AB-FO) arranged Heat exchanger bypass flaps 81, 82 for transferring thermal energy between the air flows, a hybrid refrigeration system 5 with a compressor 50, an evaporator 55 and a condenser 52 and a water/water glycol refrigerant heat exchanger as an additional condenser, a reheating device 9, a device for adiabatic spray dampening 41, 42, flaps 61 - 64; 71, 72; 81, 82 for controlling the air flows and a device for regulating the humidity and temperature of at least part of the air flows.

Description

The invention relates to an air conditioning device according to claim 1 and a method for operating such an air conditioning device according to claim 15.

For the air conditioning of rooms with high internal heat loads, which are caused, for example, by electronic data processing systems, telephone exchanges and similar heat sources, air conditioning units are indispensable in order to ensure the operational readiness of these systems by regulating the temperature and humidity in the rooms to be air-conditioned. Due to the year-round operation of the air conditioning units, considerable demands are still placed on the economic efficiency of these units, so that in order to reduce energy consumption while ensuring the air conditioning of the rooms with the most constant temperature and humidity possible, adiabatic spray humidification is used in addition to the mechanical cooling systems with condensers, evaporators and heat pipes for cooling and free cooling depending on the heat loads occurring in the rooms to be air-conditioned and the external conditions.

With adiabatic spray humidification, moisture is added to the air flow to lower the room temperature in order to reduce the energy consumption while maintaining the same performance for room air conditioning, heat is extracted through evaporation and thus a cooling effect is achieved without involving a refrigeration system. With free cooling, when the outside air temperatures are correspondingly low, outside air is supplied directly to the room to be air-conditioned as supply air and exhaust air is routed to the exhaust air, if necessary with an increased air throughput by increasing the speed of the fans.

In the DE 10 2017 202 250 A1 proposes an air conditioner with a housing that has openings for outside air, supply air, exhaust air and exhaust air and in which devices for air treatment, such as filters, heat pumps and a refrigeration system with a condenser, evaporator and compressor are arranged. To generate fresh air, circulating air or mixed flows in and out of the room to be air-conditioned, a supply air fan is provided near the supply air connection and an exhaust air fan and a flap system with several individual flaps is provided near the exhaust air connection, which directs the air flows through the air conditioning unit into controlled in such a way that the air flows can be guided through the air treatment devices or around the air treatment devices, with the evaporator being arranged in the flow direction in front of the supply air fan and the condenser of the refrigeration system being arranged in the flow direction in front of the exhaust air fan.

Other air conditioners are in the documents U.S. 8,746,327 B2 , JP H02-10 040 A , JP 2005-291 617 A , U.S. 2017/0 045 257 A1 and WO 2016 / 133 444 A1 described.

In order to ensure effective temperature and humidity control of the room with high heat loads, in which people are at least part of the time, with high energy efficiency depending on the climatic conditions outside, a two-stage countercurrent heat exchanger for the transfer of thermal energy between an outside air and exhaust air flow is required and an exhaust air/supply air flow in the air recirculation mode of the air conditioning unit and a two-stage adiabatic spray humidification device in the flow path of the outside air/exhaust air flow, whereby a two-stage transfer of thermal energy between the outside air/exhaust air flow and the exhaust air/supply air flow with a two-stage adiabatic spray humidification in the flow path of the outside air/exhaust air flow and so that a graduated air-conditioning of a room is made possible without the humidity in the exhaust air-supply air flow increasing as a result of the adiabatic cooling of the outside air-exhaust air flow and thus the moisture content in the room to be air-conditioned being adversely affected. Depending on the climatic conditions outside and the heat loads occurring in the room to be air-conditioned, the indoor climate can be kept essentially constant with low energy consumption and a sufficient supply of fresh air for the people in the room to be air-conditioned can be ensured by including the counterflow heat exchanger and/or the adiabatic cooling become.

The object of the present invention is to specify an air conditioning device of the type mentioned at the outset, which, with little production effort and high energy efficiency, allows effective temperature and humidity control of a room with high heat loads, in which people are at least part of the time, depending on the climatic conditions outside. guaranteed and can be operated all year round with the greatest possible economy.

According to the invention, this object is achieved by the features of patent claim 1 .

The solution according to the invention provides an air conditioner that, with high energy efficiency and depending on the climatic conditions outside, effectively controls the temperature and humidity of a room with high heat loads, in which people are at least part of the time. possible and can be operated all year round with maximum efficiency.

For mechanical cooling or dehumidification, a hybrid refrigeration system with a condenser, a cold water register and a hot water register or a combination register as a reheat for heating the supply air during dehumidification as well as a cold water and hot water circuit, which is connected via a cold water and a hot water heat exchanger to the with the Condenser and a compressor associated refrigerant circuit are involved.

For humidity control and mechanical cooling or post-cooling, the cold water register of a hybrid refrigeration system, the supply air fan and a post-heating device as a hot water register of the hybrid refrigeration system are arranged behind the first cross-flow heat exchanger in the flow path directed from the outside air opening to the supply air opening, preferably directly in front of the supply air opening. The exhaust air fan and the condenser of the refrigeration system are arranged between the second cross-flow heat exchanger and the exhaust air opening.

As climate change and the reduction of global warming potential demand a phase-out of refrigerants with fluorinated hydrocarbons, which have a direct global warming potential (GWP - Global Warming Potential) of 2500 and higher, but the alternative refrigerants with low GWP are highly flammable, at Air conditioners with an integrated refrigeration system must take precautions to prevent equipment and people in the rooms to be air-conditioned from being endangered in the event of a leak in the refrigeration system.

In order to ensure maximum operational reliability with high energy efficiency while complying with regulatory requirements, at least the condenser and the parts of the hybrid refrigeration system carrying the refrigerant, but preferably the entire hybrid refrigeration system, are arranged between the exhaust air fan and the exhaust air opening.

This arrangement of the hybrid refrigeration system ensures maximum efficiency and operational safety while complying with regulatory requirements, in that the supply air flow is cooled with cold water, a cold water/antifreeze mixture or brine, which is connected to the refrigerant-carrying parts of the hybrid on the exhaust air side refrigeration system so that on the one hand the use of a refrigerant enables efficient heat exchange, but at the same time it is ensured that in the event of a leak or accident the refrigerant is blown out via the exhaust air, while on the other hand a cold water register on the supply air side ensures efficient cooling of the supply air all year round guaranteed. A monitoring device installed on the exhaust air side can also emit a visual and/or acoustic alarm in the event of a leak or accident.

• - mindestens einen Kompressor, der über eine ein Kältemittel führende Kältemittelleitung mit einem Kondensator verbunden ist,
• - einen die Kältemittelleitung mit einer Kaltwasserleitung thermisch koppelnden Kaltwasserwärmetauscher als Verdampfer, der über die Kaltwasserleitung mit dem Kaltwasserregister im Strömungsweg des Zuluftstromes verbunden ist, wobei der Verdampfer und die das Kältemittel führenden Teile der Hybrid-Kälteanlage im Strömungsweg des Fortluftstromes angeordnet sind, und
• - einen Warmwasserwärmetauscher als zusätzlichen Kondensator, der über eine Warmwasserleitung mit dem im Strömungsweg des Zuluftstromes angeordneten Warmwasserregister als Nacherwärmungseinrichtung verbunden ist.

The hybrid refrigeration system contains

• - at least one compressor which is connected to a condenser via a refrigerant line carrying a refrigerant,
• - a cold water heat exchanger thermally coupling the refrigerant line to a cold water line as an evaporator, which is connected via the cold water line to the cold water register in the flow path of the supply air flow, the evaporator and the refrigerant-carrying parts of the hybrid refrigeration system being arranged in the flow path of the exhaust air flow, and
• - A hot water heat exchanger as an additional condenser, which is connected via a hot water line to the hot water register arranged in the flow path of the supply air stream as a reheating device.

All components of the refrigeration system are integrated in the air conditioning unit housing.

At the air outlets of a first cross-flow heat exchanger, first and second supply air bypass flaps are arranged next to one another and separately from one another, and at the air outlets of a second cross-flow heat exchanger, first and second exhaust air bypass flaps are arranged next to one another and separately from one another. supply air flow, in recirculation mode for the controlled admixture of outside air in the exhaust air supply air flow and exhaust air in the outside air exhaust air flow and in outside air operation for free cooling of the outside air supply air flow and the exhaust air exhaust air flow in order to set the desired humidity and temperature in the room to be air-conditioned . The first supply air bypass damper is behind a first outlet of the first cross-flow heat exchanger in the direction of flow of the exhaust air-supply air stream, the first exhaust air bypass damper is behind a first outlet of the second cross-flow heat exchanger, which has the second heat exchanger bypass damper, the first exhaust air Bypass damper in the flow direction of the exhaust air supply air flow behind a second outlet of the first cross-flow heat exchanger and the second exhaust air bypass damper in the flow direction of the outside air exhaust air flow behind a second outlet passage of the second cross-flow heat exchanger.

A first bypass flap between the exhaust air opening and the supply air opening of the device housing, which directs the outside air/exhaust air flow past the first and second cross-flow heat exchanger, and a second bypass flap between the outside air opening and the exhaust air opening of the device housing, which directs the exhaust air/supply air flow past the first and second cross-flow heat exchanger, allow the exhaust air to be re-cooled -Inlet air flow bypassing the cross-flow heat exchanger and ensure a reduction in pressure loss as a result of bypassing the air flow through the cross-flow heat exchanger with a low recooling effect with and without mechanical cooling of the exhaust air-inlet air flow by activating mechanical cooling as required.

A one-stage direct adiabatic spray humidification in the flow path of the exhaust air flow before the inlet of the second cross-flow heat exchanger and a two-stage indirect adiabatic spray humidification in the flow path of the outdoor air-exhaust air flow between the outlet of the first cross-flow heat exchanger and the inlet of the second cross-flow heat exchanger enables a thermodynamic treatment of the air flows by means of a very efficient and Energy-saving adiabatic cooling for humidification and pre-cooling of the exhaust air flow when the outside air temperature is high compared to the supply air temperature.

The arrangement of the exhaust air opening and the air supply opening on the one hand and the exhaust air opening and outside air opening on the other hand on one side of the device housing as well as the exhaust air opening above the air supply opening and the exhaust air opening above the outside air opening makes the air conditioning unit suitable for use in computing systems, since the air intake openings of the device housing are positioned in this way can, that they, that they open into the intermediate space of a double floor accommodating electrical and electronic devices. This enables the air conditioner to be optimally connected to the conditions in a data center, as warm air is discharged from the upper area of the room to be air-conditioned on one side of the air conditioner, fed directly into the upper area of the air conditioner and processed there and then again in the lower area is supplied to the room to be air-conditioned where a double floor is usually set up for receiving cooling air from the double floor sucking electrical and electronic devices. On the other side of the air conditioning unit, outside air is sucked in for recooling in the lower area and discharged from the air conditioning unit to the outside area as warmed exhaust air in the upper area.

The configuration of an air conditioning device described above enables the air conditioning device to be operated under different ambient conditions and setpoint values for the temperature, the relative humidity and the CO2 content of the air in the room to be air-conditioned with the features of claims 15 to 28.

• 1 eine schematische Darstellung eines Klimageräts mit einem Gerätegehäuse mit Außenluft-, Zuluft-, Abluft- und Fortluftanschlüssen, einem Fortluft- und Zuluftventilator, Kreuzstromwärmetauschern, adiabatischen Sprühbefeuchtungseinrichtungen, einem Kondensator, einem Kaltwasserregister oder Verdampfer und einer als Warmwasserregister, Kondensator oder Kombiregister ausgebildeten Nacherwärmungseinrichtung, sowie Klappen zur Steuerung der Luftströme;
• 2 das Klimagerät gemäß 1 mit einer Hybrid-Kälteanlage mit einem Kompressor und einem Kaltwasser- und Warmwasserwärmetauscher, an die der Kondensator, das Kaltwasserregister und die Nacherwärmungseinrichtung angeschlossen sind; und
• 3 bis 11 in das Klimagerät gemäß 1 eingetragene Luftströme zur Klimatisierung eines Raumes bei unterschiedlichen Umgebungsbedingungen und Sollwerten der Temperatur und Luftfeuchtigkeit im zu klimatisierenden Raum.

For a better understanding of the features and advantages of the air conditioner according to the invention, its configuration and several operating states for different ambient conditions and target values for temperature and humidity in the room to be air-conditioned are to be explained using the exemplary embodiments shown in the drawings. Show it:

• 1 a schematic representation of an air conditioning device with a device housing with outside air, supply air, exhaust air and exhaust air connections, an exhaust air and supply air fan, cross-flow heat exchangers, adiabatic spray humidification devices, a condenser, a cold water register or evaporator and a reheating device designed as a hot water register, condenser or combination register, and flaps to control airflow;
• 2 the air conditioner according to 1 with a hybrid refrigeration system with a compressor and a cold water and hot water heat exchanger, to which the condenser, the cold water register and the post-heating device are connected; and
• 3 until 11 into the air conditioner according to 1 Airflows introduced for air conditioning in a room with different ambient conditions and target values for temperature and humidity in the room to be air-conditioned.

The schematic in 1 The air conditioner shown has a device housing 1 which, connected to the room to be air-conditioned, has an exhaust air opening 11 and an air supply opening 12 arranged below the exhaust air opening 11, as well as an outside air opening 14 to the outside and an exhaust air opening 13 arranged above the outside air opening 14. An exhaust air flow AB is discharged from the room to be air-conditioned via the exhaust air opening 11, while an incoming air flow ZU is supplied via the air inlet opening 12 to the room to be air-conditioned. An exhaust air flow FO reaches the outside space via the exhaust air opening 13 , while an outside air flow AU is fed to the air conditioning unit via the outside air opening 14 . By arranging the exhaust air opening 11 and air intake opening 12 on one side and the exhaust air opening 13 and outside air opening 14 on the other side of the device housing 1 and the positioning of the Zuluftöff 12 below the exhaust air opening 11, the air supply opening 12 can easily be aligned with the intermediate space, e.g. designed as a double floor, leading to electronic devices, in particular a computer system, while the heated exhaust air is sensibly removed from above and thus fed directly to the device via the exhaust air opening 11 can.

This arrangement of the housing openings results in two main flow paths in the recirculation mode of the air conditioner, of which the outside air-exhaust air flow AU-FO is directed away from the room to be air-conditioned, while the exhaust air-supply air flow AB-ZU is directed into the room to be air-conditioned, and in Outdoor air operation an outdoor air supply air flow AU-ZU directed into the room to be air-conditioned and an exhaust air outgoing air flow AB-FO directed away from the room to be air-conditioned.

The air conditioning unit has several units for air flow generation and thermodynamic air treatment as well as several controllable flaps, through which various air flows are generated, treated with regard to their temperature and moisture content, filtered and in recirculation mode as outside air exhaust air flow AU-FO from the outside air opening 14 via two cross-flow heat exchangers arranged one behind the other 31, 32 to the exhaust air opening 13 and as an exhaust air supply air flow AB-ZU from the exhaust air opening 11 via the cross-flow heat exchanger 31, 32 to the supply air opening 12, while in outside air operation an outside air supply air flow AU-ZU directed into the room to be air-conditioned and an outside air supply air flow from to air-conditioning space away directed exhaust air flow AB-FO over the side-by-side cross-flow heat exchangers 31, 32 are passed.

The aggregates for air flow generation consist of a supply air fan 21 arranged near the supply air opening 12 and thus sucking in the exhaust air supply air flow AB-ZU, preferably directly driven and continuously controllable or adjustable, as well as a supply air fan 21 arranged near the exhaust air opening 13 and thus the outside air exhaust air flow AU-FO sucking, also preferably directly driven and continuously controllable or adjustable exhaust air fan 22.

• - den je nach Betriebsart hintereinander geschalteten bzw. übereinander angeordneten ersten und zweiten Kreuzstromwärmetauschern 31, 32, in denen im Umluftbetrieb ein Energieaustausch zwischen dem Abluft-Zuluftstrom AB-ZU und dem Außenluft-Fortluftstrom AU-FO stattfindet, während im Außenluftbetrieb zur freien Kühlung mit und ohne Zuschaltung der mechanischen Kühlung mittels des Verdampfers und Kondensators einer Kälteanlage bzw. eines Kaltwasserregister 51 und Kondensators 52 einer Hybrid-Kälteanlage 5 der Außenluft-Zuluftstrom AU-ZU sowie der Abluft-Fortluftstrom AB-FO über Bypassklappen durch den ersten und zweiten Kreuzstromwärmetauscher 31, 32 ohne Energieaustausch geleitet werden,
• - dem im Strömungsweg des Abluft-Zuluftstromes AB-ZU bzw. Außenluft-Zuluftstrom AU-ZU angeordneten Verdampfer der Kälteanlage oder Kaltwasserregister 51 der Hybrid-Kälteanlage 5 und dem im Strömungsweg des Außenluft-Fortluftstrom AU-FO bzw. Abluft-Fortluftstrom AB-FO angeordneten Kondensator 52 der Kälteanlage bzw. Hybrid-Kälteanlage 5,
• - der als Warmwasserregister, Kondensator oder Kombiregister als Reheat bei Entfeuchtung ausgebildeten Nacherwärmungseinrichtung 9 zur Nacherwärmung und genauen Feuchte- und Temperaturregelung der Zuluft ZU,
• - adiabatischen Sprühbefeuchtungseinrichtungen 41, 42, mit denen eine adiabate Kühlung durch Versprühen und/oder Verdunsten von Wasser erfolgt, wobei eine einstufige direkte adiabatische Sprühbefeuchtungseinrichtung 41 vor einem Eingang des ersten Kreuzstromwärmetauschers 31 in Strömungsrichtung des Abluft-Zuluftstromes AB-ZU und eine zweistufige indirekte adiabatische Sprühbefeuchtungsstufe 42 zwischen einem Ausgang des ersten Kreuzstromwärmetauschers 31 und einem Eingang des zweiten Kreuzstromwärmetauschers 32 in Strömungsrichtung des Außenluft-Fortluftstromes AU-FO angeordnet ist und
• - einem im Strömungsweg des Abluft-Zuluftstromes AB-ZU hinter der Abluftöffnung 11 angeordneten Abluftfilter 15 sowie einem im Strömungsweg des Außenluft-Fortluftstromes AU-FO hinter der Außenluftöffnung 14 angeordneten Außenluftfilter 16.

The units for thermodynamic air treatment consist of

• - The first and second cross-flow heat exchangers 31, 32, which are connected in series or arranged one above the other, depending on the operating mode, in which an energy exchange between the exhaust air supply air flow AB-ZU and the outside air exhaust air flow AU-FO takes place in circulating air mode, while in outside air mode for free cooling with and without switching on the mechanical cooling by means of the evaporator and condenser of a refrigeration system or a cold water register 51 and condenser 52 of a hybrid refrigeration system 5, the outside air supply air flow AU-ZU and the exhaust air exhaust air flow AB-FO via bypass flaps through the first and second cross-flow heat exchanger 31 , 32 be conducted without energy exchange,
• - The evaporator of the refrigeration system or cold water register 51 of the hybrid refrigeration system 5 arranged in the flow path of the exhaust air-supply air flow AB-ZU or outside air-supply air flow AU-ZU and the evaporator in the flow path of the outside air-exhaust air flow AU-FO or exhaust air-exhaust air flow AB-FO arranged condenser 52 of the refrigeration system or hybrid refrigeration system 5,
• - the post-heating device 9 designed as a hot water register, condenser or combination register as a reheat during dehumidification for post-heating and precise humidity and temperature control of the incoming air,
• - Adiabatic spray moistening devices 41, 42, with which adiabatic cooling takes place by spraying and/or evaporating water, with a single-stage direct adiabatic spray moistening device 41 in front of an inlet of the first cross-flow heat exchanger 31 in the flow direction of the exhaust air supply air flow AB-ZU and a two-stage indirect adiabatic Spray humidification stage 42 is arranged between an output of the first cross-flow heat exchanger 31 and an input of the second cross-flow heat exchanger 32 in the flow direction of the outside air exhaust air flow AU-FO and
• - an exhaust air filter 15 arranged in the flow path of the exhaust air supply air flow AB-ZU behind the exhaust air opening 11 and an outside air filter 16 arranged in the flow path of the outside air exhaust air flow AU-FO behind the outside air opening 14.

To control the air flows in the air conditioning unit, there is a supply air flap 61 between one outlet of the first cross-flow heat exchanger 31 and the evaporator/cold water register 51 or supply air fan 21, through which the exhaust air supply air flow AB-ZU flows in recirculation mode, and a supply air bypass flap 62 between the other output of the first cross-flow heat exchanger 31 and the evaporator / cold water register 51 for the admixture of an outside air partial flow AU arranged in the supply air flow ZU to supply fresh air to the room to be air-conditioned when people are present. An exhaust air damper 63 through which the outside air exhaust air flow AU-FO flows in recirculation mode is between one output of the second Cross-flow heat exchanger 32 and the condenser 52 or exhaust air fan 22 and an exhaust air bypass flap 64 is arranged between the other outlet of the second cross-flow heat exchanger 32 and the condenser 52 or exhaust air fan 22 for admixing a partial exhaust air flow AB in the exhaust air flow FO to adjust the volumetric flow balance, by adding a partial volume of the exhaust air flow AB to the exhaust air flow FO. The supply air and exhaust air flaps 61, 63 and supply air and exhaust air bypass flaps 62, 64 are preferably continuously adjustable independently of one another.

To reduce the air throughput through or to bypass the first and second cross-flow heat exchanger 31, 32, first and second circulating air bypass flaps 71, 72 are located between the exhaust air opening 11 and the air supply opening 12 of the device housing 1 and between the outside air opening 14 and the exhaust air opening 13 of the device housing 1 provided with which the air resistance formed by the cross-flow heat exchanger 31, 32 can be turned off.

First and second heat exchanger bypass flaps 81, 82 are arranged at one inlet of the first cross-flow heat exchanger 31 and at one outlet of the second cross-flow heat exchanger 32, the position of which determines whether a volume flow is conducted through the cross-flow heat exchanger or is bypassed around the cross-flow heat exchanger.

2 shows a schematic representation of the connection of the cold water register 51, the condenser 52 and the reheating device 9 of the hybrid refrigeration system 5, where instead of in 2 shown configuration of the air conditioner with two cross-flow heat exchangers 31, 32 and adiabatic spray humidification devices 41, 42, a different device configuration can also be selected and connected to the hybrid refrigeration system 5, for example an arrangement with a counter-flow heat exchanger instead of the cross-flow heat exchanger, a cold water register with and without a downstream one Humidification device and a hot water register in front of the air intake or the like.

The hybrid refrigeration system 5 contains a refrigerant circuit and a cold and hot water circuit, which are thermally connected to one another via a cold water heat exchanger 55 as an evaporator for the refrigeration circuit and a hot water heat exchanger 90 as a condenser. The refrigerant circuit contains a compressor 50, a refrigerant line 53 and a throttle valve 54 as well as the refrigerant lines of the cold water heat exchanger 55 designed as a refrigerant/water-glycol heat exchanger as an evaporator and of the hot water heat exchanger 90 as a condenser. The cold water circuit transfers the cold generated in the refrigerant circuit via the cold water heat exchanger 55, a cold water or brine line 56 with a cold water reservoir 58 and a cold water pump 57 to the cold water register 51. The optionally provided hot water circuit contains the hot water heat exchanger 90 to extract at least part of the necessary condensation energy, which is a hot water line 91 with a hot water reservoir 93 and a hot water pump 92 is routed to the reheating device 9 . While the chilled water heat exchanger 55 is provided on the low pressure side of the compressor 50 between the throttle valve 54 and the compressor 50 , the chilled water heat exchanger 55 is provided on the high pressure side of the compressor 50 between the throttle valve 54 and the compressor 50 . The hybrid refrigeration system 5 can also be designed as a system with several circuits.

Since the hybrid refrigeration system 5 is arranged entirely on the exhaust air side of the air conditioner, it is ensured that in the event of a leak or breakdown in the hybrid refrigeration system 5, the refrigerant is blown out with the exhaust air directly via the exhaust air opening by means of the exhaust air fan 22, while on the other hand on the supply air side the evaporator 51 ensures efficient cooling of the supply air all year round. A monitoring device installed on the exhaust air side can also emit a visual and/or acoustic alarm in the event of a leak or accident.

The hot water heat exchanger 90, which is optionally provided and decouples part of the condensation heat, directs hot water to the reheating device 9 for reheating the supply air flow during humidity control. Alternatively or additionally, a first recirculating air bypass flap 71 bridging the exhaust air flow and the supply air flow can be used for the controlled admixture of part of the exhaust air flow to the supply air flow be provided, so that warm air can be added to the supply air flow with the first recirculating air bypass flap 71 in order to set the desired humidity and temperature in the room to be air-conditioned.

In the schematic representations of 1 and 2 Not shown is a control or regulation device that is connected to various sensors located in the air conditioning unit and in the room to be air-conditioned and in the outside area, as well as via actuators in the form of mechanical, electrical and electronic actuators with the units for air flow generation and thermodynamic air treatment and the controllable flaps .

• - im Umluftbetrieb wird ein Außenluftstrom AU über die Außenluftöffnung 14 des Gerätegehäuses 1 angesaugt und als Außenluft-Fortluftstrom AU-FO über
  • - den ersten Kreuzstromwärmetauscher 31,
  • - die optional aktivierbare zweistufige indirekte adiabatische Sprühbefeuchtung 42 zur adiabaten Kühlung des Außenluft-Fortluftstromes AU-FO,
  • - den zweiten Kreuzstromwärmetauscher 32 und,
  • - den Kondensator 52 der optional aktivierbaren Hybrid-Kälteanlage 5 als Fortluftstrom FO über die Fortluftöffnung 13 des Gerätegehäuses 1 und
  ein Abluftstrom AB über die Abluftöffnung 11 des Gerätegehäuses 1 angesaugt und als Abluft-Zuluftstrom AB-ZU
  • - entgegen der Strömungsrichtung des Außenluft-Fortluftstromes AU-FO durch den ersten und zweiten Kreuzstromwärmetauscher 31, 32,
  • - das Kaltwasserregister 51 der optional aktivierbaren Hybrid-Kälteanlage 5 zum Herunterkühlen des Zuluftstromes ZU, der mittels der Erwärmungs- und/oder Entfeuchtungseinrichtung 9 oder der über die erste Umluft-Bypassklappe 71 beigemischten warmen Abluft AB konditioniert, d.h. bezüglich der Feuchtigkeit und Temperatur eingestellt, als Zuluftstrom ZU über die Zuluftöffnung 12 des Gerätegehäuses 1 an den zu klimatisierenden Raum abgegeben wird,
  während im Außenluftbetrieb zur freien Kühlung gegebenenfalls mit Zuschaltung der Hybrid-Kälteanlage 5 ein Außenluftstrom AU über die Außenluftöffnung 14 des Gerätegehäuses 1 angesaugt und als Zuluftstrom ZU über
  • - den ersten Kreuzstromwärmetauscher 31 bei geöffneter erster Wärmetauscher-Bypassklappe 81,
  • - die Zuluft-Bypassklappe 62 und
  • - das Kaltwasserregister 51 der optional aktivierbaren Hybrid-Kälteanlage 5 zum Herunterkühlen des Zuluftstromes ZU, der mittels der Erwärmungs- und/oder Entfeuchtungseinrichtung 9 oder der über die erste Umluft-Bypassklappe 71 beigemischten warmen Abluft AB konditioniert, d.h. bezüglich der Feuchtigkeit und Temperatur eingestellt und als Zuluftstrom ZU über die Zuluftöffnung 12 des Gerätegehäuses 1 an den zu klimatisierenden Raum abgegeben wird, wobei
  der Abluftstrom AB über die Abluftöffnung 11 des Gerätegehäuses 1 angesaugt und als Fortluftstrom FO über
  • - den zweiten Kreuzstromwärmetauscher 32,
  • - die Fortluft-Bypassklappe 64 und
  • - den Kondensator 52 der optional aktivierten Hybrid-Kälteanlage 5 und über die Fortluftöffnung 13 des Gerätegehäuses 1 an die Umgebung abgegeben wird.

With the in the 1 and 2 The air conditioning unit shown schematically can, depending on the ambient conditions and the climatic conditions in the room to be air-conditioned, i.e. the difference between the specified setpoints and the measured actual values of temperature and humidity in the room to be air-conditioned, taking into account the energy consumption, the following thermodynamic treatments of the exhaust air supply air flow AB-ZU and the outside air-exhaust air flow AU-FO in recirculation mode or the outside air-supply air flow AU-ZU and extract air-exhaust air flow AB-FO in outside air mode for free cooling:

• - In recirculation mode, an outside air flow AU is sucked in via the outside air opening 14 of the device housing 1 and as an outside air exhaust air flow AU-FO
  • - the first cross-flow heat exchanger 31,
  • - the optionally activatable two-stage indirect adiabatic spray humidification 42 for adiabatic cooling of the outside air exhaust air flow AU-FO,
  • - the second cross-flow heat exchanger 32 and,
  • - The condenser 52 of the optionally activatable hybrid refrigeration system 5 as exhaust air flow FO via the exhaust air opening 13 of the device housing 1 and
  an exhaust air flow AB sucked in via the exhaust air opening 11 of the device housing 1 and as an exhaust air supply air flow AB-ZU
  • - against the flow direction of the outside air exhaust air flow AU-FO through the first and second cross-flow heat exchanger 31, 32,
  • - The cold water register 51 of the optionally activatable hybrid refrigeration system 5 for cooling down the supply air flow ZU, which is conditioned by means of the heating and/or dehumidifying device 9 or the warm exhaust air AB mixed in via the first circulating air bypass flap 71, ie adjusted with regard to humidity and temperature, is released as supply air flow ZU via the supply air opening 12 of the device housing 1 to the room to be air-conditioned,
  while in the outdoor air mode for free cooling, optionally with the hybrid refrigeration system 5 being switched on, an outdoor air flow AU is sucked in via the outdoor air opening 14 of the device housing 1 and supplied as an inlet air flow ZU
  • - The first cross-flow heat exchanger 31 with the first heat exchanger bypass flap 81 open,
  • - The supply air bypass damper 62 and
  • - The cold water register 51 of the optionally activatable hybrid refrigeration system 5 for cooling down the supply air flow ZU, which is conditioned by means of the heating and/or dehumidifying device 9 or the warm exhaust air AB mixed in via the first recirculating air bypass flap 71, i.e. adjusted with regard to humidity and temperature and is delivered as a supply air flow ZU via the supply air opening 12 of the device housing 1 to the room to be air-conditioned, wherein
  the exhaust air flow AB is sucked in via the exhaust air opening 11 of the device housing 1 and as exhaust air flow FO
  • - the second cross-flow heat exchanger 32,
  • - The exhaust air bypass damper 64 and
  • - The condenser 52 of the optionally activated hybrid refrigeration system 5 and the exhaust air opening 13 of the device housing 1 is discharged to the environment.

This results in the 3 until 9 illustrated operating states for conditioning the supply air and exhaust air flow as well as for energy exchange between the exhaust air supply air flow AB-ZU and the outside air exhaust air flow AU-FO in recirculation mode as well as the outside air supply air flow AU-ZU and extract air exhaust air flow AB-FO in outside air operation depending on the ambient conditions and the temperature and humidity of the room air, ie as a function of the outside temperature T _AU , the extract air temperature T _AB , supply air temperature T _ZU , the resulting exhaust air temperature T _FO and the humidity of the supply air.

In the schematic representations of 3 until 11 the flaps 61 to 64, 71, 72 and 81, 82 that are closed during the respective operating modes are crossed out and the volume flows are shown in solid lines, with the volume flows guided through the cross-flow heat exchangers 31, 32 being dashed and those through the bypasses on the cross-flow heat exchangers 31, 32 flow rates are shown crossed out.

In the 3 until 5 the recooling of the exhaust air flow AB drawn in from the room to be air-conditioned is shown schematically at outside air temperatures T _AU that are very low compared to the target values of the supply air temperatures T _ZU to be regulated, i.e. T _AB ≥ T _FO > T _ZU >> T _AU .

3 shows the re-cooling of the exhaust air flow AB drawn in from the room to be air-conditioned without adiabatic spray humidification and thus adiabatic cooling and without mechanical cooling, whereby humidity control is not necessary and a temperature control via a volume flow control of the exhaust air fan 22 takes place.

The warm exhaust air supply air flow AB-ZU, which has an exhaust air temperature T _AB , is cooled down in recirculation mode in the second cross-flow heat exchanger 32 in countercurrent by means of the outside air exhaust air flow AU-FO, which in the first cross-flow heat exchanger 31 cools down the exhaust air supply air flow AB-ZU with the cold outside air temperature T _AU of the outside air flow AU is further cooled down and discharged via the supply air opening 12 to the room to be air-conditioned, while the outside air/exhaust air flow AU-FO heated in the process is correspondingly heated as a warm exhaust air flow FO as a result of the exhaust air/supply air flow AB-ZU being cooled down in the second cross-flow heat exchanger 32 the exhaust air opening 13 is discharged to the environment.

In the 4 The recooling shown schematically requires humidity control with mechanical cooling due to excessive humidity in the exhaust air flow. To control the temperature and humidity of the supply air ZU, the cooling area of the hybrid refrigeration system 5 with the cold water register 51 and the reheating device 9 and/or by opening the first circulating air bypass flap 71 is activated depending on the ambient conditions and the setpoint value of the moisture content of the supply air ZU of the room to be air-conditioned . The cold water released from the cold water heat exchanger 55 integrated into the refrigerant circuit 53 carrying the refrigerant to the refrigerant line 56 is routed to the cold water register 51 by means of the cold water pump 57, while the heat released from the condenser 52 is released to the environment or the exterior via the exhaust air opening 13 becomes. For reheating and humidity control, heat given off via the hot water heat exchanger 90 to the hot water line 91 can optionally be given off to the reheating device 9 by means of the hot water pump 92 and/or the first circulating air bypass flap 71 can be opened in a controlled manner so that the exhaust air supply air flow AB-ZU has a proportion of the exhaust air AB is added.

To control the supply air temperature T _ZU , the exhaust air flow FO released via the exhaust air opening 13 of the device housing 1 can also be varied, in particular by changing the flow rate of the exhaust air fan 22 . By controlling the exhaust air flow FO, with a low exhaust air flow FO there is less heat transfer from the exhaust air supply air flow AB-ZU to the outside air exhaust air flow AU-FO, so that the supply air temperature T _ZU is increased, while with a strong exhaust air flow there is a large heat transfer from the exhaust air Supply air flow AB-ZU to the outside air exhaust air flow AU-FO takes place, whereby the supply air temperature T _ZU is reduced.

At the in 5 Schematically illustrated operation of the air conditioner, the outside air temperature T _AU is also very low compared to the supply air temperature T _ZU to be controlled, whereby humidity control is required due to the excessive humidity of the exhaust air flow AB, which in this constellation takes place by admixing the outside air flow AU into the supply air flow ZU, by controlled opening of the supply air bypass flap 62, part of the outside air-exhaust air flow AU-FO for dehumidification and fresh air control of the room to be air-conditioned to the supply air flow ZU and for volume flow balance a part of the exhaust air-supply air flow AB-ZU by controlled opening of the exhaust air bypass flap 64 dem exhaust air flow FO is added. In this mode of operation, there is no adiabatic cooling of the outside air flow AU and instead the hybrid refrigeration system 5 with the cold water register 51, the condenser 52 and the hot water register 9 is optionally activated as a reheating device for dehumidification.

The outside air flow AU supplied to the air-conditioning unit at the outside air temperature T _AU via the outside air opening 14 further cools down the exhaust air flow AB, which has already been cooled in the second cross-flow heat exchanger 32, in the first cross-flow heat exchanger 31, while the outside air-exhaust air flow AU-FO heated in the second cross-flow heat exchanger 32 is converted to the exhaust air flow FO the condenser 52 is discharged to the exhaust air opening 13. A portion of the outside air/exhaust air flow AU-FO heated in the first cross-flow heat exchanger 31 is mixed with the supply air flow ZU through the regulated opening of the supply air bypass damper 62 and the remaining part of the outside air/exhaust air flow AU-FO cools the warm exhaust air in counterflow in the second cross-flow heat exchanger 32 Supply air flow AB-ZU down.

The exhaust air supply air flow AB-ZU cooled down in the first cross-flow heat exchanger 31 is cooled down to the supply air temperature T _ZU by means of the cold water register 51 of the activated hybrid refrigeration system 5 and, if the temperature is too high, heated by activating the reheating device designed as a hot water register 9 and fed via the supply air opening 12 to the room to be air-conditioned.

At the in 6 Schematically illustrated operation of the air conditioner, with high outside air humidity but the desired extract air humidity, the outside air temperature T _AU is greater than the supply air temperature Tzu to be regulated but lower than the extract air temperature T _AB (TA _AB > T _AU > T _ZU ). About the outside air opening 14 the air conditioner with the outside air temperature T _AU When the first heat exchanger bypass flap 81 is closed and the supply air flap 61 is open, the outside air flow AU supplied is routed through the first cross-flow heat exchanger 31 and cools the exhaust air supply air flow AB-ZU cooled down in the second cross-flow heat exchanger 32 by means of the outside air exhaust air flow AU-FO, with the second heat exchanger also being closed -Bypass flap 82 and open exhaust air flap 63, the outside air exhaust air flow AU-FO is passed through the second cross-flow heat exchanger 32.

In this mode of operation, due to the correct extract air humidity, there is no adiabatic cooling of the extract air supply air flow AB-ZU and the outside air extract air flow AU-FO and instead mechanical cooling is activated by switching on the cold water register 51 and the condenser 52. If the actual value of the exhaust air humidity rises above its setpoint, the hot water register 9 is optionally activated, with the exhaust air supply air flow AB-ZU through the cold water register 51 of the activated hybrid refrigeration system 5 and the hot water register 9 and the outside air exhaust air flow AU-FO through the condenser 52 of the activated hybrid refrigeration system 5 are performed.

At the in 7 In the operation of the air conditioner shown schematically, the outside air temperature T _AU is very high compared to the supply air temperature T _ZU (T _AU >> T _ZU ) to be controlled, while the actual value of the outside air humidity is very low compared to the setpoint value of the supply air and the extract air humidity is too low. Under these climatic conditions, the exhaust air supply air flow AB-ZU is humidified and pre-cooled by means of the single-stage direct adiabatic spray humidification 41 before it enters the second cross-flow heat exchanger 32, to which the warm outside air exhaust air flow AU-FO also reaches when the second heat exchanger bypass flap 82 is open bypassed in the bypass as in the first cross-flow heat exchanger 31 when the first heat exchanger bypass flap 81 is open. The warm outside air exhaust air flow AU-FO is routed via the open exhaust air flap 63 and the condenser 52 of the hybrid refrigeration system 5, which is optionally activated for temperature control, to cool the supply air temperature T _ZU guided to the desired value by means of the exhaust air fan 22 to the exhaust air opening 13. The cooled-down exhaust air supply air flow AB-ZU is partially mixed with the warm outside air exhaust air flow AU-FO via the exhaust air bypass flap 64 and the outside air exhaust air flow AU-FO is partially mixed with the cooled exhaust air supply air flow AB-ZU via the supply air bypass flap 62.

The warm exhaust air supply air flow AB-ZU, which has been cooled down by means of the single-stage direct adiabatic spray humidification 41, is fed through the second cross-flow heat exchanger 32 and the first cross-flow heat exchanger 31, the open supply air flap 61 and the cold water register 51, which is optionally activated to cool the supply air temperature T _ZU to its setpoint, by means of the supply air fan 21 directed to the air inlet opening 12. To control the humidity of the supply air ZU, a part of the warm outdoor air exhaust air flow AU-FO is mixed with the exhaust air supply air flow AB-ZU by controlled opening of the supply air bypass damper 62 and a part of the cooled down exhaust air supply air flow AB-ZU by controlled opening of the exhaust air to balance the volume flow -Bypass flap 64 added to the exhaust air flow FO.

At the in 8th In the operation of the air conditioner shown schematically, the outside air temperature T _AU is very high compared to the supply air temperature T _ZU (T _AU >> T _ZU ) to be controlled, while the actual value of the outside air humidity is lower than the setpoint value of the supply air ZU and the actual value of the extract air humidity is the setpoint value of the supply air is equivalent to.

The outside air AU supplied to the air conditioner with the high outside air temperature T _AU via the outside air opening 14 is in counterflow in the first cross-flow heat exchanger 31 by means of the first or the first and second stage of the two-stage indirect adiabatic spray humidification 42 as outside air outgoing air flow AU-FO with the first heat exchanger closed. Bypass flap 81 cools down and, with the second heat exchanger bypass flap 82 closed, cools down the exhaust air supply air flow AB-ZU, which has the exhaust air temperature T _AB and is routed via the first cross-flow heat exchanger 31 and the supply air flap 61, in counterflow. Depending on the deviation of the actual value of the supply air temperature T _ZU from its setpoint, the hybrid refrigeration system 5 is optionally switched on and the exhaust air supply air flow AB-ZU routed via the cold water register 51 is cooled down and released via the supply air opening 12 to the room to be air-conditioned, while the exhaust air flow FO is discharged to the outside via the condenser 52 and the exhaust air opening 13 .

A further variant in the event of a deviation of the actual value of the supply air temperature T _ZU from its setpoint consists in changing the speed of the exhaust air fan 52 or switching on an additional exhaust air fan.

At the in 9 Schematically illustrated operation of the air conditioner, the outside air temperature T _AU is very high compared to the supply air temperature T _ZU and higher than the exhaust air temperature T _AB (TA _AB <T _AU >> T _ZU ) with correct exhaust air humidity.

In order to reduce the pressure loss with a low re-cooling effect, the exhaust air supply air flow AB-ZU can be reduced by opening the first circulating air bypass flap 71 and the outside air exhaust air flow AU-FO by opening the second circulating air bypass flap 72 at the first and second cross-flow heat exchanger 31, 32 with the supply air flap 61, supply air bypass flap 62, exhaust air flap 63 and exhaust air bypass flap 64 closed and the exhaust air supply air flow AB-ZU is recooled by activating the hybrid refrigeration system 5 become. Optionally, the hot water register 9 can be switched on after the cold water register 51 if the supply air humidity is too high.

If the outside temperature is very high, the outside air exhaust air flow AU-FO can alternatively be passed through the first and second cross-flow heat exchangers 31, 32 with the spray device switched on. As a result, the temperature of the outside air exhaust air flow AU-FO drops before the condenser 52 and the refrigeration circuit has a significantly better efficiency.

With outside air temperatures T _AU and humidity of the outside air AU approximately corresponding to the required supply air temperature Tzu and humidity of the supply air (T _AU ≈ T _ZU ) according to 10 The principle of free cooling can be used by opening the first heat exchanger bypass flap 81 by directing the outside air flow AU through the bypass past the first cross-flow heat exchanger 31 and via the open supply air bypass flap 62 with the supply air flap 61 closed directly to the supply air opening 12. When the second heat exchanger bypass flap 82 is closed, the exhaust air flow AB is routed through the second cross-flow heat exchanger 32 and via the open exhaust air bypass flap 64 and the inactive condenser 52 of the hybrid refrigeration system 5 to the exhaust air opening 13 . If the supply air temperature T _ZU is too low, a partial volume flow of the exhaust air AB is added to the supply air ZU via the first circulating air bypass flap 71 .

11 shows a schematic representation of an application of the principle of free cooling at high outside air temperatures that are higher than the supply air temperatures (T _AU > T _ZU ), an outside air humidity corresponding to the target value of the supply air ZU and an excessively high extract air humidity. In these climatic conditions, the flap positions and thus the exhaust air flow AB-FO and the outdoor air supply air flow AU-ZU are as in the constellation according to 10 set and additionally mechanically cooled by activating the cold water coil 51 and condenser 52 of the hybrid refrigeration system 5.

Reference List

1

device housing

5

Hybrid refrigeration system

9

Reheating device (hot water register, condenser, combi register as reheat for dehumidification)

11

exhaust vent

12

supply air opening

13

exhaust vent

14

outside air vent

15

exhaust filter

16

outdoor air filter

21

supply air fan

22

exhaust fan

31

first cross-flow heat exchanger

32

second cross-flow heat exchanger

41

single-stage direct adiabatic spray humidification

42

two-stage indirect adiabatic spray humidification

50

compressor / compressor

51

Evaporator / cold water coil

52

capacitor

53

refrigerant line

54

throttle valve

55

Cold water heat exchanger as evaporator

56

cold water pipe

57

cold water pump

58

cold water reservoir

61

supply air damper

62

Supply air bypass damper

63

exhaust damper

64

exhaust air bypass damper

71, 72

first and second recirculation bypass flap

81, 82

first and second heat exchanger bypass flap

90

Hot water heat exchanger as a condenser

91

hot water pipe

92

hot water pump

93

hot water reservoir

AWAY

exhaust flow

AU

outdoor air flow

FO

exhaust airflow

TO

supply airflow

AB-FO

exhaust air flow

FROM-TO

exhaust-supply air flow

AU-FO

outdoor air exhaust airflow

AU-ZU

outdoor air supply airflow

AWAY'

Part of the extract air supply air flow

AU'

Part of outdoor air exhaust air flow

FIG

part of the exhaust air flow

DEW

outside air temperature

TZU

supply air temperature

TFO

exhaust air temperature

TAB

exhaust air temperature

TW1 - TW3

heat exchanger temperatures

Claims (28)

air conditioner with - a device housing (1) with an exhaust air opening (11), supply air opening (12), exhaust air opening (13) and outside air opening (14) for guiding an outside air flow (AU), exhaust air flow (AB), exhaust air flow (FO) and supply air flow (ZU), - flaps (61-64; 71, 72; 81, 82) for controlling the air flows and - Units (21, 22, 3, 41, 42, 51, 52, 8, 9) for air flow generation and thermodynamic air treatment with - at least one supply air and exhaust air fan (21, 22) for generating the air currents, - A device (31, 32) for the transfer of thermal energy between the air streams and - A device for controlling the humidity and temperature of at least part of the air flows - a hybrid refrigeration system (5) with a compressor (50), a condenser (52), a cold water heat exchanger (55) as an evaporator and a hot water heat exchanger (90) as a condenser, which are connected to one another via a refrigerant line (53) carrying a refrigerant and are arranged in the flow path of the exhaust air flow (FO), - a cold water register (51) arranged in the flow path of the supply air flow (ZU), which is connected via a cold water line (56) to the cold water heat exchanger (55) thermally coupling the refrigerant line (53) to the cold water line (56), and - A post-heating device (9) arranged in the flow path of the supply air flow (ZU) and designed as a hot water register, which is connected via a hot water line (91) to the hot water heat exchanger (90) that thermally couples the refrigerant line (53) to the hot water line (91). air conditioner after claim 1 , characterized in that the parts of the hybrid refrigeration system (5) carrying the refrigerant are arranged between the outgoing air fan (22) and the outgoing air opening (13). air conditioner after claim 1 or 2 , characterized by a first and second cross-flow heat exchanger (31, 32) with heat exchanger bypass flaps (81, 82) arranged in the flow paths of the outside air supply air flow (AU-ZU) and the exhaust air exhaust air flow (AB-FO), with both Cross flow heat exchanger (31, 32) from an outside air exhaust air flow (AU-FO) and an exhaust air supply air flow (AB-ZU) and in outside air operation the first cross flow heat exchanger (31) from an outside air supply air flow (AU-ZU) and the second cross flow heat exchanger ( 32) are traversed by an exhaust air flow (AB-FO). air conditioner after claim 3 , characterized by first and second supply air bypass flaps (61, 62) arranged next to one another and separately from one another at the air outlets of the first cross-flow heat exchanger (31) and first and second exhaust air bypass flaps ( 63, 64). air conditioner after claim 4 , characterized in that the first supply air bypass flap (61) in the flow direction of the exhaust air supply air flow (AB-ZU) behind a first output of the first cross-flow heat exchanger (31) and the first exhaust air flap (63) in the flow direction of the outside air exhaust air flow (AU- FO) is arranged behind a second heat exchanger bypass valve (82) having the first output of the second cross-flow heat exchanger (32). air conditioner after claim 4 or 5 , characterized in that the second supply air bypass flap (62) in the flow direction of the exhaust air supply air flow (AB-ZU) behind a second outlet of the first cross-flow heat exchanger (31) and the second exhaust air bypass flap (64) in the flow direction of the outside air exhaust air flow ( AU-FO) is arranged behind a second outlet of the second cross-flow heat exchanger (32). Air conditioning device according to at least one of the preceding claims, characterized by - a first bypass flap (71) between the exhaust air opening (11) and the intake opening (12) of the device housing (1) and - a second bypass flap (72), between the outdoor air opening (14) and the outgoing air opening (13) of the device housing (1), which directs the outside air/exhaust air flow AU-FO past the first and second cross-flow heat exchanger (31, 32). Air conditioning device according to at least one of the preceding claims, characterized by a one-stage direct adiabatic spray humidification (41) in the flow path of the exhaust air flow (AB) before the inlet of the second cross-flow heat exchanger (32) and a two-stage indirect adiabatic spray humidification (42) in the flow path of the outside air exhaust air flow ( AU-FO) between the outlet of the first cross-flow heat exchanger (31) and the inlet of the second cross-flow heat exchanger (32). Air conditioning device according to at least one of the preceding claims, characterized in that the exhaust air opening (11) and air supply opening (12) on the one hand and the outgoing air opening (13) and outside air opening (14) on the other hand are each on one side of the device housing (1), the exhaust air opening (11) are arranged above the supply air opening (12) and the exhaust air opening (13) above the outside air opening (14). Air conditioner according to at least one of the preceding claims, characterized in that the exhaust air fan (22) and the condenser (52) of the hybrid refrigeration system (5) are arranged between the second cross-flow heat exchanger (32) and the exhaust air opening (13). Air conditioning device according to at least one of the preceding claims, characterized in that in the flow path directed from the outside air opening (14) to the air inlet opening (12) behind the first cross-flow heat exchanger (31), the evaporator of the hybrid refrigeration system (5), the air inlet fan (21) and a reheating device (9) designed as a condenser or combination register as a reheat of the hybrid refrigeration system (5) is preferably arranged immediately in front of the air inlet opening (12) during dehumidification. Air conditioner according to at least one of the above Claims 1 until 10 , characterized in that in the flow path directed from the outside air opening (14) to the supply air opening (12) behind the first cross-flow heat exchanger (31), the cold water register (51) of the hybrid refrigeration system (5), the supply air fan (21) and a hot water register or Combination register as a reheat of the hybrid refrigeration system (5) designed reheating device (9) is preferably arranged immediately before the air inlet opening (12) during dehumidification. Air-conditioning device according to at least one of the preceding claims, characterized by supply air and exhaust air fans (21, 22) which are arranged in the flow paths, are directly driven and can be steplessly controlled or regulated. Air conditioning device according to at least one of the preceding claims, characterized in that the air inlet opening (12) of the device housing (1) opens into the intermediate space of a double floor accommodating electrical and electronic devices, in particular a computer system. Method for operating an air-conditioning device according to at least one of the preceding claims, characterized in that in air recirculation mode - an outside air flow (AU) is sucked in via the outside air opening (14) of the device housing (1) and as an outside air exhaust air flow (AU-FO) via - the first and second cross-flow heat exchanger (31, 32), - the open exhaust air flap (63) and - the condenser (52) of the optionally activatable hybrid refrigeration system (5) is discharged as exhaust air flow (FO) via the exhaust air opening (13) of the device housing (1). and - an exhaust air flow (AB) is sucked in via the exhaust air opening (11) of the device housing (1) and as an exhaust air supply air flow (AB-ZU) - against the flow direction of the outside air exhaust air flow (AU-FO) through the first and second cross-flow heat exchanger (31 , 32), - the open supply air flap (61) - the cold water register (51) of the optionally activatable hybrid refrigeration system (5) and - the optionally activatable reheating device (9) as supply air flow (ZU) via the supply air opening (12) of the device housing (1 ) is delivered to the room to be air-conditioned, with the cold water heated in the cold water register (51) and circulated by the cold water pump (57) when the hybrid refrigeration system (5) is activated being recooled in the cold water heat exchanger (55) and that being recooled by the compressor (50) in the refrigerant circuit compressed and heated refrigerant is cooled in the hot water heat exchanger (90) serving as a condenser and the heated water is delivered via the hot water line (91) to the optionally activated reheating device (9) for heating the supply air flow (ZU), with residual heat in the condenser (52) being transferred to the exhaust air (FO) is released. procedure after claim 15 , characterized in that for the re-cooling of the exhaust air flow (AB) drawn in from the room to be air-conditioned at outside air temperatures (T _AU ), which are very low compared to the supply air temperatures to be regulated (T _ZU ), the outside air flow (AU) without adiabatic spray humidification for adiabatic cooling and without switching on the hybrid refrigeration system (5) and the exhaust air flow (AB) in the first and second cross-flow heat exchanger (31, 32) exchange thermal energy in countercurrent and on the one hand as exhaust air flow (FO) via the exhaust air damper (63) to the exhaust air opening (13) of the device housing (1) and on the other hand as supply air flow (ZU) via the supply air flap (61) to the supply air opening (12) of the device housing (1). procedure after Claim 16 , characterized in that to control the supply air temperature (T _ZU ) the exhaust air flow (FO) emitted via the exhaust air opening (13) of the device housing (1), in particular by changing the flow rate of the exhaust air fan (22), is varied. Procedure according to one of Claims 15 until 17 , characterized in that to regulate the humidity in the room to be air-conditioned, the hybrid refrigeration system (5) with the cold water register (51), the condenser (52) and the hot water heat exchanger (90) serving as a condenser and the reheating device (9) depending on the Ambient conditions and the target values for temperature and humidity in the room to be air-conditioned are activated. procedure after claim 15 , characterized in that at an outside air temperature (T _AU ) that is small compared to the supply air temperature to be regulated (T _zU ) with high humidity of the exhaust air flow (AB), a humidity control by admixing a part of the outside air exhaust air flow (AU-FO) in the Exhaust air supply air flow (AB-ZU) takes place by controlled opening of the supply air bypass flap (62) by allowing part of the outside air exhaust air flow (AU-FO) for dehumidification and fresh air control of the room to be air-conditioned to the exhaust air supply air flow (AB-ZU) and to balance the volumetric flow, part of the exhaust air-supply air flow (AB-ZU) is mixed with the outside air-exhaust air flow (AU-FO) by regulated opening of the exhaust air bypass damper (64) and, if the humidity and temperature of the mixed flows are too high, the hybrid cooling system (5) is optional is activated. procedure after claim 15 , characterized in that at high outside air humidity and the setpoint corresponding exhaust air humidity at an outside air temperature (T _AU ) which is greater than the supply air temperature to be regulated (T _ZU ) but less than the exhaust air temperature (T _AB ) (TA _AB > T _AU > T _ZU ) the outside air flow (AU) supplied via the outside air opening (14) is passed through the first cross-flow heat exchanger (31) when the first heat exchanger bypass flap (81) is closed and the supply air flap (61) is open and is fed into the second cross-flow heat exchanger (32) by means of the outside air Exhaust air flow (AU-FO) cooled down exhaust air supply air flow (AB-ZU), with the second heat exchanger bypass flap (82) also being closed and exhaust air flap (63) open, the outside air exhaust air flow (AU-FO) passing through the second cross-flow heat exchanger (32) is conducted. procedure after claim 15 , characterized in that at an outside air temperature (T _AU ) that is very high compared to the supply air temperature to be regulated (T _ZU ) (T _AU >> T _ZU ), and an actual value of the outside air humidity that is very small compared to the setpoint value of the supply air too low exhaust air humidity the exhaust air-supply air flow (AB-ZU) is humidified and pre-cooled by switching on the single-stage direct adiabatic spray humidification (41) before it enters the second cross-flow heat exchanger (32), that the warm outside air-exhaust air flow (AU-FO) at the first and second cross-flow heat exchanger (31, 32) is bypassed when the first and second heat exchanger bypass flap (81, 82) is open and that the warm outside air exhaust air flow (AU-FO) via the open exhaust air flap (63) and the condenser (52 ) of the hybrid refrigeration system (5), optionally activated for temperature control, for cooling the supply air temperature (Tzu) to its setpoint to the exhaust air opening 13. procedure after Claim 21 , characterized in that the cooled-down exhaust air supply air flow (AB-ZU) via the exhaust air bypass flap (64) partially to the warm outside air exhaust air flow (AU-FO) and the outside air exhaust air flow (AU-FO) via the supply air bypass flap ( 62) is partially added to the cooled exhaust air supply air flow (AB-ZU). procedure after claim 15 , characterized in that when the outside air temperature (T _AU ) is very high compared to the supply air temperature (T _ZU ) to be regulated and the actual value of the outside air humidity is less than the target value of the supply air, while the actual value of the exhaust air humidity corresponds to its target value, the outside air exhaust air flow (AU-FO) is cooled down depending on the outside air humidity by means of the first and second stage of the two-stage indirect adiabatic spray humidification (42) and directed in counterflow past the exhaust air supply air flow (AB-ZU), which is cooled down and passed through the first cross-flow heat exchanger (31) and the open supply air flap (61) is routed, with the hybrid refrigeration system (5) being switched on depending on the target/actual value difference of the supply air temperature (T _ZU ) and the exhaust air supply air flow (AB-ZU) routed via the cold water register (51) being cooled down and is delivered to the space to be air-conditioned while the exhaust air flow (FO) is released to the outside via the condenser (52). Method according to at least one of the preceding Claims 15 until 18 , characterized in that at an outside air temperature (T _AU ), which is very high compared to the supply air temperature (T _ZU ) and greater than the exhaust air temperature (T _Ab ) (TA _AB <T _AU >> T _ZU ) with correct exhaust air humidity, the exhaust air - The supply air flow (AB-ZU) is routed past the first and second cross-flow heat exchanger (31, 32) by opening the first recirculating air bypass flap (71) and the outside air exhaust air flow (AU-FO) by opening the second recirculating air bypass flap (72) and the exhaust air supply air flow (AB-ZU) is optionally re-cooled by activating the hybrid refrigeration system (5). Method according to at least one of the preceding Claims 15 until 17 , characterized in that at an outside air temperature (T _AU ), which is very high compared to the supply air temperature (T _ZU ) and greater than the exhaust air temperature (T _Ab ) (TA _AB <T _AU >> T _ZU ) with correct exhaust air humidity, the exhaust air - The supply air flow (AB-ZU) is routed past the first and second cross-flow heat exchanger (31, 32) by opening the first recirculation air bypass flap (71) and the outside air-exhaust air flow (AU-FO) is routed through the first and second cross-flow heat exchanger (31, 32). and humidified, while the exhaust air supply air flow (AB-ZU) is optionally re-cooled by activating the hybrid refrigeration system (5). Method for operating an air conditioning device according to at least one of the above Claims 1 until 14 , characterized in that in outdoor air operation at outdoor air temperatures (T _AU ) and humidity of the outdoor air (AU) the required supply air temperature (T _ZU ) and humidity of the supply air (ZU) correspond (T _AU ≈ T _ZU ) for free cooling, the first heat exchanger Bypass flap (81) is opened and the outside air flow (AU) is routed through the bypass past the first cross-flow heat exchanger (31) and via the open supply air bypass flap (62) with the supply air flap (61) closed directly to the supply air opening (12) and that the exhaust air flow (AB ) when the second heat exchanger bypass flap (82) is closed, through the second cross-flow heat exchanger (32) and via the open exhaust air bypass flap (64) and the inactive condenser (52) of the hybrid refrigeration system (5) to the exhaust air opening (13). procedure after Claim 26 , characterized in that when the supply air temperature (T _ZU ) is too low, a partial volume flow of the exhaust air (AB) is added to the supply air (ZU) via the first circulating air bypass flap (71). procedure after Claim 26 , characterized in that at high outside air temperatures (T _AU ), which are greater than the supply air temperatures (T _ZU ) (T _AU > T _ZU ), an outside air humidity corresponding to the setpoint of the supply air (ZU) and an excessively high extract air humidity, the hybrid refrigeration system (5) is switched on.

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