AU2005200896B1 - An Improved Water Heater - Google Patents
An Improved Water Heater Download PDFInfo
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- AU2005200896B1 AU2005200896B1 AU2005200896A AU2005200896A AU2005200896B1 AU 2005200896 B1 AU2005200896 B1 AU 2005200896B1 AU 2005200896 A AU2005200896 A AU 2005200896A AU 2005200896 A AU2005200896 A AU 2005200896A AU 2005200896 B1 AU2005200896 B1 AU 2005200896B1
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- Australia
- Prior art keywords
- heat exchange
- water heater
- heat
- water
- heater according
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Description
0 A SPLIT HEAT TRANSFER SYSTEM S Field of the Invention.
The present invention relates to water heaters and in particular to heat N pump, heat exchange type water heaters.
Background Art.
IN There are a variety of heat pumps which are used as heaters.
00 o A heat pump is essentially an air conditioner with a few additions. Heat pumps 0can be used in a cooling mode, such as in an air conditioner and in a heating mode for oheating. A heat pump has a reversing valve, two metering devices and two bypass valves. Figure 1 shows a heat pump in heating mode. The cycle goes like this; The compressor 1 pumps the refrigerant to the reversing valve 2.
The reversing valve directs the flow to the inside coil (condenser) where the heat is removed 4 from the refrigerant and this condenses the refrigerant to liquid.
The liquid refrigerant 5 flows to the second metering device 6 at the outside coil (evaporator) where it is metered.
Here it picks up heat energy from the air blowing 3 across the outside coil (evaporator) and the air comes out cooler 7.
The refrigerant vapour 8 then travels back to the reversing valve 2 to be directed to the compressor 1 to start the cycle all over again.
Traditionally heat pump water heaters are made with a displacement tank under pressure and containing a tank for the potable water to be heated. Such displacement tanks are normally constructed in heavy gauge steel and are internally protected from corrosion with an internal coating of porcelain enamel. The existing design of heat pump water heaters are constructed with a copper tube heat exchange coil of tubing (condenser) which transports heated gas. As heat is transferred from the heated gas to the water to be heated, the heated gas undergoes a phase change from a gaseous phase to the liquid phase (condensation). The heat released due to the phase change (Heat of vaporisation) is available to heat the water to be heated.
According to a first prior art heat pump water heater, the heat exchange (condenser) coil of tubing is tightly wound and adhered to the outside surface of the tank. Alternatively the condenser coil is tightly wound and adhered to the inside surface of a heavy gauge pressure resistant steel tube disposed vertically and centrally within the tank. Both of these configurations are illustrated in Figures 2A and 2B O 2
O
respectively.
The traditional heat exchange storage water heater is fitted with an inner copper tank containing a static body of water open to atmosphere, a heat O exchange copper coil for conversion of cold potable water (passing through the coil under town water pressure) to hot water by heat transfer from the static body of water IN surrounding it, all of which is contained in an insulated outer jacket. The temperature 00 o of the water in the storage tank is controlled by an thermostat which controls the 0 operation of the associated heating unit.
OThe prior art configurations of displacement type water heaters have 0 10 inherent problems. Firstly, in order to satisfy the standards regarding the use of the refrigerant gas and potable water, the flows of each are required to be separated by a double wall, such that if a perforation of a line containing one of the working fluids occurs, the other working fluid is not contaminated. That is, in order for contamination to occur, both of the walls in the double wall arrangement must be perforated.
This in turn means that when using prior art displacement type water heaters, the coil (condenser) could not be placed directly into a body of water to be heated, and still maintain double wall separation. A perforation in the refrigerant line would contaminate the potable heated water.
In turn, this results in the configurations used in Figures 2A and 2B, where the double wall separation of the working fluids is maintained by firstly, the wall of the coil through which the refrigerant flows and secondly by the wall of the tank containing the water to be heated.
Traditional heat pump water heater designs have also relied on placing the compressor unit within an outer casing on top of the water heater outer case top lid as a mounting platform and which method permits connection of both units at the factory thereby providing a composite package with no requirement for the expertise of a refrigeration mechanic to effectively connect gas lines.
This method has several disadvantages. The compressor unit being quite heavy and having been mounted on top of the water heater tank renders the package top heavy which leads to difficulties and potential damage in handling such a heavily combined package in storage and transport. The location of the combined units leads to problems of noise abatement as the location is limited by the space 3
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0 C, required for a large storage vessel of water, and the restriction that the compressor and C fan unit can be quite noisy.
It will be clearly understood that, if a prior art publication is referred to oherein, 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.
Summary of the Invention, 00 The present invention is directed to an improved water heater, which 0 0may at least partially overcome at least one of the abovementioned disadvantages or o provide the consumer with a useful or commercial choice.
In one form, the invention resides in a water heater including a. a heat pump including at least one evaporator means for adding heat to a first working fluid, at least one compressor means for compressing at least a portion of the first working fluid, and at least one condensing means for condensing at least a portion of the first working fluid releasing an amount of heat, and b. a heat exchange means through which a fluid to be heated flows, wherein the at least one condensing means of the heat pump and the heat exchange means are both associated with a heat exchange media, and at least some of the heat lost from the first working fluid in the at least one condensing means transferred to the water to be heated via the heat exchange media.
In use, the water heater of the present invention the fluid to be heated is generally water and the invention offers improved heat transfer efficiency as the heat exchange means may be placed directly into a body of heat exchange media, while still maintaining double wall separation between the potable water to be heated and the working fluid used in the heat pump. The heat exchange media may be a fluid and therefore may completely surround and envelop the heat exchange means. Secondly, as the units can be separated, replacement of an older or damaged unit is more easily accomplished.
The heat pump may be of any type, but will suitably be either a vapour compression heat pump or an absorption heat pump. The operation of both of these types of heat pump is based on known thermodynamic principles. Suitably, the at least one condensing means of the heat pump and the heat exchange means are both immersed directly in the heat exchange media.
In 4 ClThe heat pump will have a working fluid. Traditionally, the most ct common working fluids for heat pumps have been: o CFC-12 Low- and medium temperature (max. oo CFC- 14 High temperature (max. l2 O'C); o R-500 Medium temperature (max. 80 0
C);
o R-502 Low-medium temperature (max. 55 0
C);
08 o HCFC-22 Virtually all reversible and low-temperature heat pumps (max.
Cl 55 0
C).
Due to their chlorine content and chemical stability, CFCs 010 (Chlorofluorocarbons) are harmful to the global environent. Water may be used as a working fluid.
The working fluid may be a blend of fluids. A blend consists of two or more pure working fluids, and can be zeotropic, azeotropic or near-azeotropic.
Azeotropic mixtures evaporate and condense at a constant temperature, the others over a certain temperature range (temperature glide). The temperature glide can be utilised to enhance performance, but this generally requires equipment modification.
The advantage of blends is that they can be custom-made to fit particular needs.
Particularly preferred blends may include R-410A and R407-C. The main difference between the two is the chemical composition: R-410A is a mixture of R-32 and R-125 with minimal temperature glide, while R-407C consists of R-32, R-125 and R-l134A and has a large temperature glide.
The heat pump comprises at least an evaporator means for adding heat to a first working fluid, a compressor means for compressing at least a portion of the first working fluid, and a condensing means for condensing at least a portion of the first working fluid. Various forms of evaporator means are known and the water heater of the present invention may use any type. However, a particularly preferred type of evaporator means may be a coil of tubing or similar. The coil may be associated with a fan or other forced convection device to force air at a higher temperature to the working fluid in the coil across the coil to heat the fluid within.
The coil may be provided with fins to enlarge the effective heat transfer area of the coil. Another particularly useful and possibly preferred form of evaporator may be a solar evaporator.
O
O
'N The compressor may be of any type. As the preferred heat pump will t be a vapour compression heat pump, the refrigerant or working fluid will normally be a vapour/liquid mixture. The compressor should be adapted to compressing fluids o such as the various types of working fluid which can be used. The compressor may preferably be an electrically driven compressor.
IAlthough any type of condensing means may be used, the condenser 0S may suitably take the form of a coil or tube through which the working fluid can flow, the coil associated with the heat pump. The condensing means is suitably associated 1 with a heat exchange media to allow the heat lost from the condensing means to be transferred to the water to be heated. The heat exchange means will generally be associated with the heat exchange media as well and therefore be associated, albeit indirectly with the condenser means. The entire surface of the coil may be immersed in the heat exchange media and is able to transfer heat to the heat exchange media and thereby to the water to be heated.
The heat exchange means through which a fluid to be heated flows on a user's demand will suitably be or comprise a coil or tube through which the water to be heated flows. Of course other heat exchange means may be used instead of or in conjunction with the coil, but the coil is preferred. The coil will suitably be manufactured of a metal or other material with a high heat transfer co-efficient such as copper or the like. The heat exchange means will suitably be positioned in a tank or container holding heat exchange media, such that any heat added to the heat exchange media will also affect (heat) the heat exchange means. Again, the entire surface of the coil may be immersed in the heat exchange media and is able to transfer heat from the heat exchange media and to the water to be heated.
The tank or container of heat exchange media will generally not be pressurised. It may also be vented to the atmosphere.
The heat exchange media may preferably be water but other types of media may be used. The temperature of the heat exchange media may suitably be determined according to a user's desired temperature. The temperature of the heat exchange media may be measured and maintained through the use of a thermostatic means. The thermostatic device may be installed in the tank and may be associated with the compressor means. The thermostatic device may control the activation and ttV) 6
O
O
deactivation of the compressor and thus maintain the desired set temperature of the t heat exchange media.
Suitably, the heat pump and particularly the condenser means may be o separated from the heat exchange means. The heat pump working fluid flows in a closed loop and the water to be heated may flow in a separate loop. The loops may suitably only be associated with each other through the heat exchange media in the o tank, which also contains the heat exchange means and the condenser means of the
O
oheat pump.
I As stated above, the heat exchange means is contained with the heat 0 exchange media in a first tank or container. According to a first preferred embodiment of the present invention, the condenser means may be located in the first tank or container with the heat exchange means.
The water heater according to the first preferred embodiment may be divided into two separate but connectable units. The units may be a water heater unit and a compressor unit. This configuration allows the units to be separated by any distance. For example, the water heater unit may be located within a structure so that the heated water has a shorter distance to travel between the heater and the outlet and the compressor unit can be placed outside the structure. Alternatively, the units may be placed adjacent each other. They may be stacked in any configuration.
According to the first preferred embodiment, there may be a water heater unit comprising a heat exchange means, heat exchange media and a condenser means. The heat exchange media will generally be a fluid and a body of the media may be provided to allow or facilitate heat transfer between the heat exchange means and the condenser means.
According to the first preferred embodiment, the compressor unit may be separate from, but attachable to the water heater unit. The attachment method used may allow fluid communication between the two units. The compressor unit will suitably comprise the compressor means and the evaporator means. The attachment method and means will be adapted to allow the compressor unit to be fully charged with working fluid prior to sale and transport on site. Upon connection, the attachment means may be such that further charging with working fluid is not required or at least minimised. The compressor unit may be slightly overcharged to allow for the length on any connections which may be required, for example pipework. The attachment i) 7
O
O
N means will suitably be fluid tight connections. Alternatively, the compressor unit may Ct not be charged until it reaches the site.
According to a second preferred embodiment of the present invention, o the condenser means may be located in a separate secondary tank or container with the heat exchange media being circulated between the first tank containing the heat Iexchange means and the secondary tank containing the condenser means.
00 According to a second preferred embodiment the water heater may be 0 odivided into two units but the makeup of the two units is different to that of the first 1 preferred embodiment.
There may be a water heater unit and a heat pump unit. The second preferred embodiment differs from the first preferred embodiment in that the condenser means may not be located in the same tank as the heat exchange means.
The water heater unit according to the second preferred embodiment may comprise the heat exchange means and the heat exchange media only. A body of heat exchange media may be provided in a first tank in the water heater unit.
The heat pump unit may be separate from, but attachable to, the water heater unit. Whereas according to the first preferred embodiment, the attachments allowed the working fluid to circulate between the water heater unit and the compressor unit, according to the second preferred embodiment, the attachments may allow circulation of heat exchange media.
The heat pump unit will suitably comprise the compressor means, evaporator means and condenser means. The condenser means will suitably be located in a secondary tank of container holding a body of heat exchange media. The first tank, located in the water heater unit and the secondary tank located in the heat pump unit will be in fluid communication allowing circulation of heat exchange media between the two tanks. There may be a circulating pump provided to facilitate the circulation.
Again, any connections between the two units will preferably be fluid tight and easily connectable.
According to both particularly preferred embodiments, any tanks provided in either of the units may be fillable on site as the transport of units with tanks that are filled or even partially filled may be more difficult.
8
O
O
N It is also anticipated that the heat pump may or may not be the only t source of heat input to the storage vessel.
Brief Description of the Drawings.
o Various embodiments of the invention will be described with reference to the following drawings, in which: Figure 1 is a schematic overview of the operation of a heat pump.
00 Figure 2A is a schematic ofa first prior art heat pump water heater.
oFigure 2B is a schematic of a second prior art heat pump water heater.
l Figure 3 is a schematic view of a heat exchange water heater according to a first preferred aspect of the present invention.
Figure 4 is a schematic view of a heat exchange water heater according to a second preferred aspect of the present invention.
Figure 5 is a schematic view of a heat exchange water heater according to a third preferred aspect of the present invention.
Detailed Description of the Invention.
According to the present invention, an improved water heater 10 is provided.
In preferred embodiments, the present invention is an improved water heater 10 comprising a. a heat pump including at least one evaporator 11 for adding heat to a first working fluid, at least one compressor 12 for compressing at least a portion of the first working fluid, and at least one condenser 13 for condensing at least a portion of the first working fluid releasing an amount of heat, and b. a heat exchange coil 14 through which a fluid to be heated flows, wherein the at least one condenser 13 of the heat pump and the heat exchange coil 14 are both associated with a heat exchange media 15, and at least some of the heat lost from the first working fluid in the at least one condenser 13 transferred to the water to be heated via the heat exchange media According to a first preferred embodiment of the present invention as illustrated in Figure 3, the condenser 13 is located in a first tank 16 with the heat exchange coil 14.
The water heater 10 according to the first preferred embodiment is divided into two separate but connectable units. The units are a water heater unit 17 Ic) 9 N and a compressor unit 18. This configuration allows the units to be separated by any t distance. For example, the water heater unit 17 may be located within a structure so that the heated water has a shorter distance to travel between the heater 17 and the o outlet and the compressor unit 18 can be placed outside the structure as illustrated in Figure 3. Alternatively, the units can be placed adjacent each other or stacked in any Iconfiguration such as that illustrated in Figure 00 According to the first preferred embodiment, the water heater unit 17 ohouses the heat exchange coil 14, heat exchange media 15 and the condenser 13 of the heat pump. The heat exchange media is a fluid, in this case water. A body of water is provided to facilitate heat transfer between the condenser 13 and the heat exchange coil 14, and more particularly, the water to be heated traveling inside the coil 14,.
According to the first preferred embodiment, the compressor unit 18 is separate from, but attachable to the water heater unit 17. The attachment means 19 used allow fluid communication between the two units. The compressor unit 18 houses the compressor 12 and the evaporator 11. The evaporator is associated with a fan 21.
The attachment means 19 is adapted to allow the compressor unit 18 to be fully charged with working fluid prior to sale and transport on site. Upon connection, the attachment means 19 is such that further charging with working fluid is not required or at least minimised. The compressor unit 18 is slightly overcharged to allow for the length of any connections which may be required, for example pipework 25. The attachment means 19 provide fluid tight connections between the two units.
The tank 16 of heat exchange media 15 is not pressurised and is vented 20 to the atmosphere.
According to a second preferred embodiment of the present invention as illustrated in Figure 4, the condenser 13 is located in a secondary tank 22 with the heat exchange media 15 being circulated between the first tank 16 containing the heat exchange coil 14 and the secondary tank 22 containing the condenser 13.
According to the second preferred embodiment, the water heater 10 is again divided into two units, but the makeup of the two units is different to that of the first preferred embodiment.
01 Cl The two units according to the second embodiment are a water heater ct unit 17 and a heat pump unit 23. The second preferred embodiment differs from the first preferred embodiment in that the condenser 13 is not located in the first tank 16 o with the heat exchange coil 14. The water heater unit 17 according to the second preferred embodiment houses the heat exchange coil 14 and the heat exchange media IND 15 only. A body of heat exchange media 15 is provided in the first tank 16 in the 00 water heater unit 17.
o The heat pump unit 23 is separate from, but attachable to, the water o heater unit 17. Whereas according to the first preferred embodiment, the attachment o 10 means 19 allowed the working fluid of the heat pump to circulate between the water heater unit 17 and the compressor unit 18, according to the second preferred embodiment, the attachment means allows circulation of heat exchange media The heat pump unit 23 houses the compressor 12, evaporator 11 and condenser 13. The condenser 13 is located in a secondary tank 22 holding a body of heat exchange media 15. The first tank 16, located in the water heater unit 17 and the secondary tank 22 located in the heat pump unit 23 will be in fluid communication allowing circulation of heat exchange media 15 between the two tanks. There is a circulating pump 24 provided to facilitate the circulation.
Again, any attachment means 19 between the two units are fluid tight and easily connectable.
According to both particularly preferred embodiments, any tanks provided in either of the units are fillable on site as the transport of units with tanks that are filled or even partially filled may be more difficult. Connecting pipework is provided to connect the units.
In the present specification, the word "comprising" and its derivatives including "comprises" and "comprise" include each of the stated integers but does not exclude the inclusion of one or more further integers.
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 11
O
0 N characteristics may be combined in any suitable manner in one or more combinations.
t 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 o 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 0 within the proper scope of the description appropriately interpreted by those skilled in 0the art.
t¢l
Claims (16)
1. A water heater including a heat pump including at least one evaporator means for adding heat to a first working fluid, at least one compressor means for compressing at least a portion of the first working fluid, and at least one condensing means for condensing at least a portion of the first working fluid releasing an amount C* of heat, and a heat exchange means through which a fluid to be heated flows, the at 00 o least one condensing means of the heat pump and the heat exchange means both 0 associated with a heat exchange media, and at least some of the heat lost from the first o working fluid in the at least one condensing means transferred to the water to be 0 10 heated via the heat exchange media, wherein the water heater is divided into two separate but connectable units, a water heater unit including a heat exchange means, heat exchange media and a condenser means and a compressor unit including the compressor means and the evaporator means.
2. A water heater according to claim 1 wherein the heat exchange means is placed directly into a body of heat exchange media, while still maintaining double wall separation between the water to be heated and the working fluid used in the heat pump.
3. A water heater according to either one of claims 1 or 2 wherein the heat pump is either a vapour compression heat pump or an absorption heat pump.
4. A water heater according to any one of the preceding claims wherein the at least one condensing means of the heat pump and the heat exchange means are both immersed directly in the heat exchange media.
A water heater according to any one of the preceding claims wherein water is used as a working fluid.
6. A water heater according to any one of the preceding claims wherein the evaporator means is a coil of tubing.
7. A water heater according to any one of claims 1 to 5 wherein the evaporator means is a solar evaporator.
8. A water heater according to any one of the preceding claims wherein the at leat one condensing means is a coil or tube through which the working fluid can flow, the coil associated with the heat pump. n 13 O O
9. A water heater according to claim 8 wherein the entire surface of the coil or 3tube is immersed in the heat exchange media and is able to transfer heat to the heat exchange media and thereby to the water to be heated.
A water heater according to any one of the preceding claims wherein the heat exchange means through which the fluid to be heated flows on a user's demand Cincludes a coil or tube through which the water to be heated flows. 00 O
11. A water heater according to claim 10 wherein the entire surface of the coil is 0 immersed in the heat exchange media and is able to transfer heat from the heat O exchange media and to the water to be heated. 0 10
12. A water heater according to any one of the preceding claims wherein the heat pump is separated from the heat exchange means such that the first working fluid flows in a closed loop and the water to be heated flows in a separate loop, the respective loops associated with each other through the heat exchange media.
13. A water heater according to any one of the preceding claims wherein the heat exchange means is contained with the heat exchange media in a first tank or container and the condenser means is located in the first tank or container with the heat exchange means.
14. A water heater according to any one of the preceding claims wherein an attachment means is provided to allow the compressor unit to be fully charged with working fluid prior to sale and transport on site and upon connection, further charging with working fluid is not required due to the compressor unit being slightly overcharged to allow for the length on any connections which are required.
A water heater according to any one of claims 1 to 12 wherein the condenser means is located in a secondary tank or container with the heat exchange media being circulated between a first tank containing the heat exchange means and the secondary tank containing the condenser means, the first and second tanks being separate but associated with one another.
16. A water heater according to claim 15 wherein the water heater is divided into two separate but connectable units a water heater unit including the heat exchange means and a body of heat exchange media provided in a first tank and a heat pump unit separate from, but attachable to, the water heater unit, the heat pump unit including the compressor means, evaporator means and condenser means, the In 14 i condenser means located in a secondary tank of container holding a body of heat Sexchange media, the first tank, located in the water heater unit and the secondary tank located in the heat pump unit in fluid communication allowing circulation of heat exchange media between the two tanks. DATED this 2 9 th day of July 2005 INO C0 Peter Sachs Industries Pty Ltd 00 o By their Patent Attorneys 0 CULLEN CO. o, 0N
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2005200896A AU2005200896B1 (en) | 2004-03-02 | 2005-03-01 | An Improved Water Heater |
| AU2005203350A AU2005203350B2 (en) | 2004-03-02 | 2005-07-29 | An Improved Heat Transfer System |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2004901039 | 2004-03-02 | ||
| AU2004901039A AU2004901039A0 (en) | 2004-03-02 | An Improved Water Heater | |
| AU2005200896A AU2005200896B1 (en) | 2004-03-02 | 2005-03-01 | An Improved Water Heater |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2005203350A Division AU2005203350B2 (en) | 2004-03-02 | 2005-07-29 | An Improved Heat Transfer System |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2005200896B1 true AU2005200896B1 (en) | 2005-08-18 |
Family
ID=34888009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2005200896A Ceased AU2005200896B1 (en) | 2004-03-02 | 2005-03-01 | An Improved Water Heater |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2005200896B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589126A (en) * | 2012-02-10 | 2012-07-18 | 蒋富国 | Air heat based water heater |
| CN113048648A (en) * | 2021-05-19 | 2021-06-29 | 大连理工大学 | Machine-pump combined-drive enthalpy-increasing type working medium side waste heat recovery air source heat pump hot water unit for bathing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU581357A1 (en) * | 1975-12-29 | 1977-11-25 | Опытное Проектно-Конструкторскотехнологическое Бюро Сибирского Научно-Исследовательского И Проектнотехнологического Института Животноводства | Heating and hot-water supply plant |
| WO2003036178A1 (en) * | 2001-10-22 | 2003-05-01 | Rheem Australia Pty Limited | Improved heat pump water heater |
-
2005
- 2005-03-01 AU AU2005200896A patent/AU2005200896B1/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU581357A1 (en) * | 1975-12-29 | 1977-11-25 | Опытное Проектно-Конструкторскотехнологическое Бюро Сибирского Научно-Исследовательского И Проектнотехнологического Института Животноводства | Heating and hot-water supply plant |
| WO2003036178A1 (en) * | 2001-10-22 | 2003-05-01 | Rheem Australia Pty Limited | Improved heat pump water heater |
Non-Patent Citations (1)
| Title |
|---|
| Derwent Abstract Accession No. 1978-J4901A & SU 581357 A1 (SIBE ANIMAL HUSBAND) 15 December 1977 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589126A (en) * | 2012-02-10 | 2012-07-18 | 蒋富国 | Air heat based water heater |
| CN102589126B (en) * | 2012-02-10 | 2015-07-22 | 蒋富国 | Air heat based water heater |
| CN113048648A (en) * | 2021-05-19 | 2021-06-29 | 大连理工大学 | Machine-pump combined-drive enthalpy-increasing type working medium side waste heat recovery air source heat pump hot water unit for bathing |
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Legal Events
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| FGA | Letters patent sealed or granted (standard patent) | ||
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |