NZ732403B2 - Air Conditioning System and Method for Leakage Detection in an Air Conditioning System - Google Patents
Air Conditioning System and Method for Leakage Detection in an Air Conditioning System Download PDFInfo
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- NZ732403B2 NZ732403B2 NZ732403A NZ73240317A NZ732403B2 NZ 732403 B2 NZ732403 B2 NZ 732403B2 NZ 732403 A NZ732403 A NZ 732403A NZ 73240317 A NZ73240317 A NZ 73240317A NZ 732403 B2 NZ732403 B2 NZ 732403B2
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- refrigerant
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- evaporator
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 59
- 238000001514 detection method Methods 0.000 title claims abstract description 33
- 239000003507 refrigerant Substances 0.000 claims abstract description 249
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 230000001143 conditioned Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000002588 toxic Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
Abstract
There is described an air conditioning system with a refrigerant circuit, wherein the air conditioning system includes a leakage detection system. The leakage detection system has a room temperature sensor, an inlet temperature sensor for detection of a refrigerant temperature at a refrigerant inlet of a refrigerant evaporator, and an outlet temperature sensor for detection of a refrigerant temperature at a refrigerant outlet of the refrigerant evaporator. The sensors are coupled with a calculating unit. The calculating unit is formed to calculate an outlet differential temperature as a difference of the room temperature and the refrigerant temperature at the refrigerant outlet and an evaporator differential temperature as a difference of the refrigerant temperature at the refrigerant inlet and at the refrigerant outlet, the outlet differential temperature and the evaporator differential temperature being used for leakage detection. In addition, there is described a method for leakage detection, in which a room temperature of the room to be air-conditioned is detected before the refrigerant evaporator on an air inlet side, a refrigerant inlet temperature is detected at the refrigerant inlet of a refrigerant evaporator, and a refrigerant outlet temperature is detected at a refrigerant outlet of the refrigerant evaporator. of a refrigerant evaporator, and an outlet temperature sensor for detection of a refrigerant temperature at a refrigerant outlet of the refrigerant evaporator. The sensors are coupled with a calculating unit. The calculating unit is formed to calculate an outlet differential temperature as a difference of the room temperature and the refrigerant temperature at the refrigerant outlet and an evaporator differential temperature as a difference of the refrigerant temperature at the refrigerant inlet and at the refrigerant outlet, the outlet differential temperature and the evaporator differential temperature being used for leakage detection. In addition, there is described a method for leakage detection, in which a room temperature of the room to be air-conditioned is detected before the refrigerant evaporator on an air inlet side, a refrigerant inlet temperature is detected at the refrigerant inlet of a refrigerant evaporator, and a refrigerant outlet temperature is detected at a refrigerant outlet of the refrigerant evaporator.
Description
Air Conditioning System and Method for Leakage Detection in an Air Conditioning
System
TECHNICAL FIELD
The invention relates to an air conditioning system with a refrigerant circuit.
Furthermore, the invention relates to a method for leakage detection in an air
conditioning system as mentioned above.
BACKGROUND ART
In the prior art, air conditioning systems are used in a wide variety of fields. In the air
conditioning systems refrigerants are used, which have properties adapted to the respective
purpose. In conventional air conditioning systems the refrigerants contain fluorinated greenhouse
gases, in particular fluorinated hydrocarbons.
With a growing environmental awareness and ever stricter legal requirements, for
example of the EU order on fluorinated greenhouse gases, so-called natural refrigerants move
into focus more and more. However, these refrigerants in general are combustible, explosive
and/or toxic, i.e. in the broadest sense harmful to human health.
Persons in the environment of air conditioning systems using such refrigerants, in
particular in the rooms air-conditioned therewith, therefore must be protected from these
refrigerants. This is of utmost importance in particular in the case of a refrigerant leakage.
Air conditioning systems with natural refrigerants also are used for air conditioning
relatively small rooms. For example, this can be leisure vehicles, i.e. caravans, trailers, mobile
homes, temporary housings, accommodation containers, etc. Persons present in such small rooms
to be air-conditioned must be protected even from smallest amounts of exiting refrigerant. This
requires an effective and robust system for leakage detection, which prevents the exit of
refrigerant due to leakage or at least minimizes the exiting amount of refrigerant. This is the only
way to provide for a safe operation of an air conditioning system with a natural refrigerant.
It will be clearly understood that, if a prior art publication is referred to herein, this
reference does not constitute an admission that the publication forms part of the common general
knowledge in the art in Australia or in any other country.
OBJECT OF THE INVENTION
It therefore is the object of the invention to provide an air conditioning system in
which a refrigerant leakage can be detected in a simple and reliable way. In particular, it should
be possible to detect even small refrigerant leakages.
SUMMARY OF INVENTION
The invention relates to an air conditioning system with a refrigerant circuit, wherein
as seen in circulation direction of a refrigerant the air conditioning system comprises a
refrigerant condenser which can be in heat exchange with an environment, a refrigerant throttle,
a refrigerant evaporator which can be in heat exchange with a room to be air-conditioned, and a
refrigerant compressor.
The object is solved by an air conditioning system as mentioned above, which
includes a leakage detection system, comprising a room temperature sensor which is formed to
detect a room temperature of the room to be air-conditioned upstream of the refrigerant
evaporator on an air inlet side, an inlet temperature sensor which is formed to detect a refrigerant
temperature at a refrigerant inlet of the refrigerant evaporator, an outlet temperature sensor which
is formed to detect a refrigerant temperature at a refrigerant outlet of the refrigerant evaporator,
and a calculating unit which is coupled with the room temperature sensor, the inlet temperature
sensor and the outlet temperature sensor. The calculating unit is formed to calculate an outlet
differential temperature as difference of the room temperature and the refrigerant temperature at
the refrigerant outlet and an evaporator differential temperature as difference of the refrigerant
temperature at the refrigerant inlet and at the refrigerant outlet. The calculation of these two
differential temperatures can be effected in a single calculating unit. Alternatively, each of the
difference calculations can be effected in a separate calculating unit. In the case of a leakage the
refrigerant circuit loses a certain amount of refrigerant. However, for example via a blower the
same heat quantity still is introduced from the room to be air-conditioned into the refrigerant
evaporator. The same applies for the refrigerant condenser. As a result, the refrigerant
temperature at the refrigerant inlet of the refrigerant evaporator decreases and the refrigerant
temperature at the refrigerant outlet of the refrigerant evaporator increases. In case of a leakage,
the outlet differential temperature hence decreases and the evaporator differential temperature
increases. This can be detected by the calculating unit and be recognized as leakage. This does
not require either a pressure sensor in the refrigerant circuit or a gas sensor in the room to be air-
conditioned. The detection of the leakage thus is easy and reliable. In addition, by means of the
temperature sensors a so-called creeping leakage can be detected, i.e. a leakage in which small
mass and/or volume flows of refrigerant exit from the air conditioning system over an extended
period.
According to one embodiment, a refrigerant-tight separating device is activated upon
detection of a leakage, in order to at least partly separate the refrigerant circuit from the room to
be air-conditioned.
In a preferred embodiment, the air conditioning system includes a refrigerant-tight
separating device for at least partly separating the refrigerant circuit from the room to be air-
conditioned. Thus, in case of a leakage the air conditioning system and/or the refrigerant circuit
can be separated from the room to be air-conditioned, in which persons can be present. The
persons thus are effectively protected from the refrigerant. The separating device preferably can
be closed at standstill, i.e. when the air conditioning system is out of operation. This provides for
a safe operation of the air conditioning system.
One design variant provides that after detection of a leakage the refrigerant inlet of
the refrigerant evaporator is shut off by means of a refrigerant inlet valve and the refrigerant
outlet of the refrigerant evaporator is shut off by means of a refrigerant outlet valve.
The refrigerant inlet valve, by means of which the refrigerant inlet can be shut off,
and the refrigerant outlet valve, by means of which the refrigerant outlet can be shut off,
preferably are formed as solenoid valves. The refrigerant outlet valve alternatively can be a
check valve, which is mounted such that it blocks a refrigerant flow in direction of the refrigerant
evaporator. The refrigerant evaporator thereby can be separated from the remaining refrigerant
circuit. As the refrigerant evaporator in general is disposed in the room to be air-conditioned,
shutting off the refrigerant evaporator also separates the room to be air-conditioned from the
remaining refrigerant circuit. Thus, persons who are present in this room effectively can be
protected from the refrigerant. Due to the valves, shutting off is possible very quickly. In
addition, the valves can be designed fail-safe. For example, they can always be closed in a de-
energized state. This ensures a safe operation of the air conditioning system.
In addition, after detection of a leakage a refrigerant-tight flap can be closed, which
shuts off the air conditioning system from the room to be air-conditioned.
The refrigerant-tight flap can be part of the separating device. The flap preferably
can be pretensioned, i.e. spring-loaded, so that in the case of a leakage it is closed quickly and
without an external drive.
Preferably, after detection of a leakage an electronic message is sent, which
preferably comprises information on the presence of a leakage.
For sending the message, the leakage detection system can contain a notifying unit
which is coupled with the calculating unit. The notifying unit is formed to create a message on
the presence of a leakage in the refrigerant circuit. In the simplest case, the notifying unit can be
a display, a screen or an indicator lamp, for example an LED. Alternatively, the notifying unit
also can create and send an electronic message, for example and SMS or e-mail. Possible
recipients beside the operator of the air conditioning system also can be a service provider, a
dealer or the manufacturer of the air conditioning system. Thus, persons affected by the leakage
can easily be informed about the same.
Advantageously, the refrigerant evaporator is designed as double-tube heat
exchanger (see German Patent Application DE 10 2015 122 681). Thus, the refrigerant
evaporator which is arranged in the room to be air-conditioned has an increased safety with
respect to the exit of refrigerant into the room to be air-conditioned. Consequently, a risk to
persons in the room to be air-conditioned in the case of a leakage in the refrigerant circuit is at
least reduced.
Another object of the invention is to indicate a method with which a leakage in a
refrigerant circuit of an air conditioning system as mentioned above can be detected easily and
reliably. In particular, even small leakages should be detected.
The object is solved by a method as mentioned above, which comprises the
following steps:
detecting a room temperature of the room to be air-conditioned upstream of the
refrigerant evaporator on an air inlet side,
detecting a refrigerant inlet temperature at a refrigerant inlet of the refrigerant
evaporator,
detecting a refrigerant outlet temperature at a refrigerant outlet of the refrigerant
evaporator,
calculating an outlet differential temperature as difference of the room temperature and
the refrigerant outlet temperature,
calculating an evaporator differential temperature as difference of the refrigerant outlet
temperature and the refrigerant inlet temperature,
detecting a leakage, when the outlet differential temperature decreases and the
evaporator differential temperature increases by a fixed value.
For the outlet differential temperature and/or the evaporator differential temperature
limit values can be fixed depending on the application of the air conditioning system. For
example, a limit value can refer to a rate of change of a temperature value. Preferably, this limit
value is 2 K/min. Alternatively, a limit value can be a temperature value.
Alternatively or in addition to step f) a leakage can be detected when the outlet
differential temperature falls below a fixed value, e.g. 10 K, and/or when the evaporator
differential temperature exceeds a fixed value, e.g. 15 K.
Upon detection of a leakage the air conditioning system is switched off
automatically. Preferably, all control and electrical components of the air conditioning system
also are switched off. Preferably, a circuitry-related locking of the air conditioning system takes
place in addition, so that the same cannot be switched on again by a user.
Any of the features described herein can be combined in any combination with any
one or more of the other features described herein within the scope of the invention.
The reference to any prior art in this specification is not, and should not be taken as
an acknowledgement or any form of suggestion that the prior art forms part of the common
general knowledge.
BRIEF DESCRIPTION OF DRAWINGS
The invention will be explained below with reference to various exemplary
embodiments which are shown in the attached drawings, in which:
Figure 1 shows the air conditioning system according to the invention in a schematic
overview,
Figure 2 shows a section of an alternative embodiment of the air conditioning system
according to the invention, and
Figure 3 shows an exemplary course of temperatures in the air conditioning system
according to the invention.
DESCRIPTION OF EMBODIMENTS
Figure 1 shows an overview of an air conditioning system 10. The air conditioning
system 10 for example can be arranged in a leisure vehicle.
The air conditioning system 10 comprises a refrigerant circuit 11 with a refrigerant
condenser 12, which is in heat exchange with an environment 14, and a refrigerant evaporator 15
with a refrigerant inlet 16 and a refrigerant outlet 17, which is in heat exchange with a room 18
to be air-conditioned.
A refrigerant circulates via a refrigerant line 20 from the refrigerant condenser 12 to
a refrigerant throttle 22 and from there via a refrigerant line 24 to the refrigerant evaporator 15.
The refrigerant line 24 also includes a refrigerant inlet valve 25, by means of which the
refrigerant inlet 16 selectively can be separated from the rest of the refrigerant circuit 11.
Proceeding from the refrigerant evaporator 15, the refrigerant circulates via a
refrigerant line 26 to a refrigerant compressor 28, which via a refrigerant line 30 is connected
with the refrigerant condenser 12. In the refrigerant line 26 a refrigerant outlet valve 31, e.g. a
check valve, is disposed, by means of which the refrigerant outlet 17 of the refrigerant
evaporator 15 can be separated from the rest of the refrigerant circuit.
For the case that both the refrigerant inlet valve 25 and the refrigerant outlet valve 31
are closed, the refrigerant evaporator 15 is shut off from the remaining refrigerant circuit 11.
The air conditioning system 10 in addition comprises a leakage detection system 32
provided with an inlet temperature sensor 34 which can detect an inlet temperature TE of the
refrigerant at the refrigerant inlet 16 of the refrigerant evaporator 15. The leakage detection
system 32 in addition comprises an outlet temperature sensor 36 which can detect an outlet
temperature TA of the refrigerant at the refrigerant outlet 17 of the refrigerant evaporator 15.
Both the inlet temperature sensor 34 and the outlet temperature sensor 36 are coupled
with a calculating unit 38.
The leakage detection system 32 in addition comprises a room temperature sensor 40
which can detect a room temperature TR of the room 18 to be air-conditioned, upstream of the
refrigerant evaporator 15 on an air inlet side 41. The room temperature sensor 40 also is coupled
with the calculating unit 38.
To the calculating unit 38 a notifying unit 42 is connected in addition.
Alternatively, a combined calculating and notifying unit can be provided.
An alternative embodiment for shutting off the refrigerant evaporator 15 from the
remaining refrigerant circuit 11 is shown in Figure 2. Here, the refrigerant evaporator 15 is
shown schematically and the rest of the refrigerant circuit 11 is cut off. The room 18 to be air-
conditioned also merely is shown broken off.
For shutting off the refrigerant circuit 11 and/or the refrigerant evaporator 15 from
the room 18 to be air-conditioned a refrigerant-tight flap 48 is provided in the embodiment of
Figure 2, which in its closed position (shown in broken lines) can shut off the air conditioning
system 10 from the room 18 to be air-conditioned.
The flap 48 for example can be pretensioned into its closed position.
Alternatively, the flap 48 can be designed as slide.
The mode of operation of the air conditioning system 10 will now be explained with
reference to the diagram shown in Figure 3. In this diagram, times t are plotted on the x-axis and
temperatures T are plotted on the y-axis.
A first curve describes the course of the room temperature TR of the room 18 to be
air-conditioned, upstream of the refrigerant evaporator 15 on the air inlet side 41. A second curve
represents the course of the refrigerant inlet temperature TE of the refrigerant at the refrigerant
inlet 16 of the refrigerant evaporator 15. A third curve illustrates the course of the refrigerant
outlet temperature TA at the refrigerant outlet 17 of the refrigerant evaporator 15.
In operation of the air conditioning system 10 the inlet temperature sensor 34 detects
the refrigerant inlet temperature TE and communicates the same to the calculating unit 38. The
outlet temperature sensor 36 detects the refrigerant outlet temperature TA and forwards the
measured temperature value to the calculating unit 38.
In the same way, the room temperature sensor 40 detects the room temperature TR of
the room 18 to be air-conditioned, upstream of the refrigerant evaporator 15 on the air inlet side
41 and provides this temperature to the calculating unit 38.
Due to the temperature values provided to the same, the calculating unit 38 calculates
an outlet differential temperature TAD as difference of the room temperature TR and the
refrigerant outlet temperature TA and an evaporator differential temperature TVD as difference
of the refrigerant outlet temperature TA and the refrigerant inlet temperature TE.
For the case that no leakage is present in the air conditioning system 10, the
temperatures TR, TA and TE are substantially constant in stationary operation of the air
conditioning system 10. Correspondingly, the evaporator differential temperature TVD and the
outlet differential temperature TAD also are substantially constant. The refrigerant circulates
through the refrigerant circuit 11, the amount of refrigerant remaining substantially constant.
It now is assumed that at the time tL a leakage occurs in the refrigerant line 20. For
example, the leakage might be caused by a crack in the refrigerant line 20.
As can be seen in the further course of the description, it is irrelevant at which point
of the refrigerant circuit 11 the leakage occurs.
Due to the leakage, a certain amount of refrigerant gets lost from the refrigerant
circuit 11.
However, the amount of heat supplied to the refrigerant circuit 11 by the blower at
the refrigerant evaporator 15 substantially remains the same. In addition, at the refrigerant
condenser 12 a substantially constant amount of heat is withdrawn from the refrigerant via a
blower.
The temperature TR of the room 18 to be air-conditioned likewise remains
substantially unchanged.
In the following, the inlet temperature TE decreases, as a constant amount of heat is
withdrawn from a decreasing amount of refrigerant at the refrigerant condenser 12. The outlet
temperature TA increases, as a constant amount of heat is introduced into a reduced amount of
refrigerant at the refrigerant evaporator 15.
In the following the outlet differential temperature TAD decreases, and the
evaporator differential temperature TVD increases.
In addition, the pressure in the refrigerant circuit 11 decreases.
The calculating unit 38 compares the change of the evaporator differential
temperature TVD with a fixed value which is stored in the calculating unit 38. This limit value
for example can be 2 K/min.
If the outlet differential temperature TAD now decreases by more than 2 K/min and
the evaporator differential temperature TVD increases by more than 2 K/min, the calculating unit
38 detects a leakage.
The limit values for TAD and TVD are to be fixed in dependence on the concrete
application and also can be different.
If the outlet differential temperature TAD falls below a fixed value, e.g. 10 K, and/or
the evaporator differential temperature TVD exceeds a fixed value, e.g. 15 K, the calculating unit
likewise detects a leakage.
As a reaction to the detection of the leakage the calculating unit 38 initially can
create a message via the notifying unit 42. For example, the notifying unit can send an SMS or e-
mail to a repair service for air conditioning systems.
In addition, the calculating unit 38 will initiate measures for the protection of persons
present in the room 18 to be air-conditioned. In the first embodiment, which is shown in Figure
1, the refrigerant inlet valve 25 and the refrigerant outlet valve 31 will be closed for this purpose.
Thus, the refrigerant evaporator 15 is shut off from the remaining refrigerant circuit 11.
Alternatively, the calculating unit 38 in the embodiment shown in Figure 2 can shift
the flap 48 from an open position (continuous line) into a closed position (broken line).
In both alternatives the room 18 to be air-conditioned then is shut off from the air
conditioning system 10, in particular from the refrigerant circuit 11. Hence, persons present in
the room 18 to be air-conditioned only are exposed to a very small amount of leaked refrigerant
or even to no refrigerant at all.
Reference throughout this specification to ‘one embodiment’ or ‘an embodiment’
means that a particular feature, structure, or characteristic described in connection with the
embodiment is included in at least one embodiment of the present invention. Thus, the
appearance of the phrases ‘in one embodiment’ or ‘in an embodiment’ in various places
throughout this specification are not necessarily all referring to the same embodiment.
Furthermore, the particular features, structures, or characteristics may be combined in any
suitable manner in one or more combinations.
In compliance with the statute, the invention has been described in language more or
less specific to structural or methodical features. It is to be understood that the invention is not
limited to specific features shown or described since the means herein described comprises
preferred forms of putting the invention into effect. The invention is, therefore, claimed in any
of its forms or modifications within the proper scope of the appended claims appropriately
interpreted by those skilled in the art.
Claims (11)
1. An air conditioning system with a refrigerant circuit, wherein in a circulation direction of a refrigerant the air conditioning system comprises a refrigerant condenser which can be in heat exchange with an environment, a refrigerant throttle, a refrigerant evaporator which can be in heat exchange with a room to be air-conditioned, and a refrigerant compressor, characterized in that the air conditioning system includes a leakage detection system with a room temperature sensor which is formed to detect a room temperature (TR) of the room to be air-conditioned, upstream of the refrigerant evaporator on an air inlet side, with an inlet temperature sensor which is formed to detect a refrigerant temperature at a refrigerant inlet of the refrigerant evaporator, with an outlet temperature sensor which is formed to detect a refrigerant temperature at a refrigerant outlet of the refrigerant evaporator, and with a calculating unit which is coupled with the room temperature sensor, the inlet temperature sensor and the outlet temperature sensor, wherein the calculating unit is formed to calculate an outlet differential temperature as a difference of the room temperature and the refrigerant temperature at the refrigerant outlet and an evaporator differential temperature as a difference of the refrigerant temperature at the refrigerant inlet and at the refrigerant outlet, the outlet differential temperature and the evaporator differential temperature being used for leakage detection.
2. The air conditioning system according to claim 1, characterized in that it includes a refrigerant-tight separating device for at least partly separating the refrigerant circuit from the room to be air-conditioned.
3. The air conditioning system according to claim 2, characterized in that the separating device comprises a refrigerant inlet valve, which is formed to selectively shut off the refrigerant inlet, and a refrigerant outlet valve, which is formed to selectively shut off the refrigerant outlet, wherein the refrigerant inlet valve and the refrigerant outlet valve preferably are formed as solenoid valves.
4. The air conditioning system according to any of claims 2 or 3, characterized in that the separating device comprises a refrigerant-tight flap which is formed to shut off the air conditioning system from the room to be air-conditioned.
5. The air conditioning system according to any of the preceding claims, characterized in that the leakage detection system comprises a notifying unit which is coupled with the calculating unit.
6. The air conditioning system according to any of the preceding claims, characterized in that the refrigerant evaporator is designed as double-tube heat exchanger.
7. A method for leakage detection in an air conditioning system with a refrigerant circuit, wherein in a circulation direction of the refrigerant the air conditioning system comprises a refrigerant condenser which can be in heat exchange with an environment, a refrigerant throttle, a refrigerant evaporator, which can be in heat exchange with a room to be air-conditioned, and a refrigerant compressor, comprising the following steps: a) detecting a room temperature (TR) of the room to be air-conditioned, upstream of the refrigerant evaporator on an air inlet side, b) detecting a refrigerant inlet temperature (TE) at a refrigerant inlet of the refrigerant evaporator, c) detecting a refrigerant outlet temperature (TA) at a refrigerant outlet of the refrigerant evaporator, d) calculating an outlet differential temperature (TAD) as a difference of the room temperature (TR) and the refrigerant outlet temperature (TA), e) calculating an evaporator differential temperature (TVD) as a difference of the refrigerant outlet temperature (TA) and the refrigerant inlet temperature (TE), f) detecting a leakage, if the outlet differential temperature (TAD) decreases and simultaneously the evaporator differential temperature (TVD) increases by a fixed value.
8. The method according to claim 7, characterized in that after detection of a leakage a refrigerant-tight separating device is activated for at least partly separating the refrigerant circuit from the room to be air-conditioned.
9. The method according to claim 8, characterized in that after detection of a leakage the refrigerant inlet of the refrigerant evaporator is shut off by means of a refrigerant inlet valve and the refrigerant outlet of the refrigerant evaporator is shut off by means of a refrigerant outlet valve.
10. The method according to claim 8 or 9, characterized in that after detection of a leakage a refrigerant-tight flap is closed, which shuts off the air conditioning system from the room to be air-conditioned.
11. The method according to any of claims 7 to 10, characterized in that after detection of a leakage an electronic message is sent, which preferably comprises information on the presence of a leakage.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016110585.6 | 2016-06-08 | ||
DE102016110585.6A DE102016110585A1 (en) | 2016-06-08 | 2016-06-08 | Air conditioning system and leak detection method in an air conditioning system |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ732403A NZ732403A (en) | 2021-01-29 |
NZ732403B2 true NZ732403B2 (en) | 2021-04-30 |
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