WO2014131679A1

WO2014131679A1 - Cooling system

Info

Publication number: WO2014131679A1
Application number: PCT/EP2014/053280
Authority: WO
Inventors: Björn FLEMSÄTER; Ingemar Hallin
Original assignee: Dometic Holding Ab
Priority date: 2013-02-28
Filing date: 2014-02-20
Publication date: 2014-09-04
Also published as: EP2772704A1

Abstract

There is provided a cooling system, comprising: a portable cooling device (20) comprising a fluid, a reactor (21) containing a sorbent capable of sorption and desorption the fluid and a chamber (22) for condensation and evaporation of the fluid, said reactor and said chamber being connected such that the fluid may flow between them; and an openable cooling box (34) comprising insulating walls (35) forming an interior space for cooling, said cooling box being adapted to receive the cooling device such that, in a closed configuration of the cooling box, heat may be transferred from the interior space to the chamber and from the reactor to an exterior cooling source, such as ambient air.

Description

COOLING SYSTEM

TECHNICAL FIELD

The invention relates to cooling, in particular of temperature-sensitive products. BACKGROUND

In food-deficit countries in the developing world, such as parts of Africa and Asia, where farmers' income and own food supply rely on and originate from agriculture, one of the key issues is to keep temperature-sensitive foods, crops or diaries cold when transporting to the local markets. Lack of sustainable and effective methods to ensure cooling during transportation could damage the farmers' valuable goods in a way such that it is lost. These farmers typically do not have access to reliable ways to secure the cold storage of their food. Transportation even over a short distance in hot weather (which is often the case) could be devastating and destroy the food. In some countries, such as India, some 30-40% of the agriculture produce is destroyed.

Also, over 1.6 million people die every year from smoke intoxication ("A Silent Killer of Rural Women in India", BBC report 2005) when using biomass-fired stoves indoors. According to Practical Action (2007), over 2.4 billion people use traditional biomass and other fossil fuels, such as wood, crop residues, charcoal or animal waste, for cooking.

In conclusion, a viable solution for ensuring cold storage in the food transportation chain in developing countries is needed. Further, there is need for replacing the fuels used today in the developing world for cooking with a fuel producing less toxic fumes.

SUMMARY

The inventors have realized that an affordable and easy-to-use stove concept fueled by a bio-combustible liquid, such as ethanol or methanol, may replace traditional firewood cook stoves as well as dangerous kerosene stoves.

Combustion of ethanol and methanol results in almost no toxic flue gases, while being obtainable from renewable resources or natural gas. Further, it has been realized that waste heat from a burner in such a stove concept may be used for regenerating a portable cooling device that may provide cooling in a simple cooling box. To meet the above-mentioned needs, there is provided a cooling device capable of batch cooling the contents of a cooling box. When the cooling capacity of the cooling device is consumed, it may be regenerated by heat in a heating device. The cooling box is designed to receive cooling device and utilize its cooling capacity. Likewise, the heating device is designed to receive the cooling device and regenerate it for another batch cooling. Also, the cooling device is designed to provide cooling in the cooling box and to be regenerated by the heating device. The cooling device, the cooling box and the heating device are separate units that may be handled separately of eachother. Thus, there is provided an itemized listing of embodiments of the present disclosure, presented for the purpose of providing various features and combinations provided by the invention in certain of its aspects.

1. A portable cooling device comprising a fluid, a reactor containing a sorbent capable of sorption and desorption of the fluid and a chamber for condensation and evaporation of the fluid, said reactor and said chamber being connected such that the fluid may flow between them.

2. The cooling device of item 1, wherein a closable valve, such as a ball valve, is arranged in the connection between the reactor and the chamber.

3. The cooling device of item 1 or 2, wherein the fluid is water or water- based and the sorbent is capable of sorption and desorption of gaseous water.

4. The cooling device of any one of items 1-3, wherein the sorbent is a salt or a microporous material, such as zeolite. 5. The cooling device of any one of items 1-4, wherein the reactor extends in a first plane and the chamber extends in a second plane, which is approximately parallel to the first plane.

6. The cooling device of any one of items 1-5, wherein the reactor is elongated and/ or the chamber is elongated.

7. The cooling device of item 6, wherein the elongated reactor is curved or bent such that it is adapted to at least partly encircle a heat source, such as a flame, for heating the reactor.

8. The cooling device of item 6 or 7, wherein the elongated chamber is curved or bent such that it is adapted to at least partly encircle a burner providing a flame. cj.The cooling device of any one of items 6-8, wherein the reactor and/or the chamber is ring-shaped.

10. The cooling device of any one of items 7-9, wherein the elongated reactor defines a first area and the elongated chamber defines a second area, which is larger than the first area.

11. The cooling device of item 10, wherein the second area is at least 30 %, such as at least 50 %, such as at least 70 %, larger than the first area.

12. The cooling device of any one of item 6-11, wherein the cross section area of the elongated chamber along at least half of its length is 2-10 cm², such as 2-7 cm², such as 3-6 cm².

13. The cooling device of any one of item 6-12, wherein the cross section area of the elongated reactor along at least half of its length is 2-10 cm², such as 2-7 cm², such as 3-6 cm². 14. The cooling device of any one of the preceding items, wherein the volume of the chamber is 100-500 cm3, such as 150-300 cm3. 15. The cooling device of any one of the preceding items, wherein the volume of the reactor is 100-700 cms, such as 150-500 cms, such as 150-400 cm3.

16. The cooling device of any one of the preceding items, further comprising at least one handle.

17. The cooling device of item 16, comprising at least two handles arranged on the outside of the chamber.

18. The cooling device of item 16 or 17, wherein each handle is provided with insulation to reduce heat transfer from the cooling device to a hand holding the handle.

19. An openable cooling box comprising insulating walls forming an interior space for cooling, wherein a portion of a wall of the cooling box is adapted to receive a portable cooling device comprising a reactor extending in a first plane, an evaporation and condensation chamber extending in a second plane, which is approximately parallel to the first plane and a connection between the reactor and the chamber, such that, in a closed configuration of the cooling box, heat may be transferred from the interior space to the chamber and from the reactor to an exterior cooling source, such as ambient air,

wherein the wall portion comprises a groove extending from an edge of the wall into the wall, said groove being adapted to receive the connection such that the chamber is located inside the cooling box and the reactor is located outside the cooling box in the closed configuration. 20. The cooling box according to item 19, wherein the wall portion has a reduced thickness compared to the rest of the wall. 21. The cooling box of item 20, wherein the reduced thickness is a reduction of at least 4 mm, such as at least 8 mm, such as at least 12 mm.

22. The cooling box according to any one of items 19-21, wherein the wall portion comprises an elevation extending from the plane of the wall and a recess adapted to receive part of the reactor is provided at the top of the elevation such that the cooling device may be locked in a received position.

23. The cooling box according to item 22, wherein a part of the elevation between the recess and the edge from which the groove extends is tapering towards the edge from which the groove extends.

24. The cooling box of any one of items 19-23, wherein the average thickness of the walls is 2-7 cm, such as 3-6 cm.

25. The cooling box of any one of items 19-24, wherein the inner volume of the cooling box is 20-100 liters, such as 20-60 liters, such as 20-40 liters.

26. The cooling box of any one of items 19-25, wherein a heat- exchanging plate composed of a heat-conducting material, such as a metal, is arranged on the outside of the wall such that said heat-exchanging plate is in physical contact with the reactor when the cooling device is received by the cooling box.

27. The cooling box of any one of items 19-26, wherein a heat- exchanging plate composed of a heat-conducting material, such as a metal, is arranged on the inside of the wall such that said heat-exchanging plate is in physical contact with the chamber when the cooling device is received by the cooling box.

28. The cooling box of item 26 or 27, wherein the heat-exchanging plate is distanced from the wall by spacers.

29. The cooling box of item 28, wherein the distance between the heat- exchanging plate and the wall is 2-10 mm, such as 2-6 mm. 30. The cooling box of any one of items 19-29, wherein the wall is a top wall or a side wall of the cooling box.

31. The cooling box of item 30, wherein the top wall is a lid allowing the cooling box to be opened. 32. The cooling box of any one of items 19-31, wherein the width of the groove is 15-50 mm, such as 20-40 mm.

33. The cooling box of any one of items 19-32, wherein the depth of the groove is 15-70 mm, such as 25-70 mm.

34. The cooling box of any one of items 19-33, wherein an edge of a second wall comprises a second groove that meets the groove of the wall in the closed configuration and forms a common receiving space for the cooling device.

35. A cooker adapted to receive a portable cooling device comprising a reactor extending in a first plane, an evaporation and condensation chamber extending in a second plane, which is approximately parallel to the first plane and a connection between the reactor and the chamber, said cooker comprising a metal frame having mainly vertical walls continuing into a mainly horizontal hob, the frame enclosing a burner and being adapted to enclose a fuel canister, wherein the frame is a bottomless frame formed of one piece so as to allow replacing of the fuel canister from the bottom side of the frame, said cooker further comprising one or several cooking utensil supports having an upper edge for supporting a cooking utensil in a position above the burner, the upper edge being provided with at least one recess for receiving the reactor of the cooling device.

36. The cooker of item 35, wherein the depth of the at least one recess is such that the reactor is not in contact with the cooking utensil when the reactor is received by the recess(es) and the cooking utensil is supported by the upper edge in the position above the burner.

37. The cooker of item 35 or 36, wherein the depth of the recess(es) is 15-50 mm. 38. The cooker of any one of items 35-37, wherein at least one hob is provided in the hob to receive the chamber.

39. A cooling system, comprising:

a portable cooling device comprising a fluid, a reactor containing a sorbent capable of sorption and desorption the fluid and a chamber for condensation and evaporation of the fluid, said reactor and said chamber being connected such that the fluid may flow between them; and

an openable cooling box comprising insulating walls forming an interior space for cooling, said cooling box being adapted to receive the cooling device such that, in a closed configuration of the cooling box, heat may be transferred from the interior space to the chamber and from the reactor to an exterior cooling source, such as ambient air.

40. The cooling system of item 39, wherein the chamber is located inside the cooling box and the reactor is located outside the cooling box when the cooling box in a closed configuration has received the cooling device. 41. The cooling system of item 39 or 40, wherein the reactor extends in a first plane and the chamber extends in a second plane, which is approximately parallel to the first plane and the distance between the reactor and the chamber in the direction perpendicular to the planes is

approximately the same as the thickness of a wall portion of the cooling box adapted to receive the cooling device.

42. The cooling system of any one of items 39-41, wherein the average thickness of the walls of the cooling box is 2-7 cm, such as 3-6 cm. 43. The cooling system of any one of items 39-42, wherein the inner volume of cooling the box is 20-100 liters, such as 20-60 liters, such as 20-40 liters.

44. The cooling system of any one of items 39-43, wherein a heat- exchanging plate composed of a heat-conducting material, such as a metal, is arranged on an outer wall of the cooling box, said heat-exchanging plate being in physical contact with the reactor when the cooling device is received by the cooling box.

45. The cooling system of any one of items 39-44, wherein a heat- exchanging plate composed of a heat-conducting material, such as a metal, is arranged on an inner wall of the cooling box, said heat-exchanging plate being in physical contact with the chamber when the cooling device is received by the cooling box.

46. The cooling system of item 44 or 45, wherein the heat-exchanging plate is distanced from the wall by spacers.

47. The cooling system of item 46, wherein the distance between the heat-exchanging plate and the wall is 2-10 mm, such as 2-6 mm.

48. The cooling system of any one of items 39-47, wherein the top wall of the cooling box is a lid allowing the cooling box to be opened. 49. The cooling system of any one of items 39-48, wherein the cooling device is the cooling device according to any one of items 1-18.

50. The cooling system of any one of items 39-49, wherein the cooling box is the cooling box according to any one of items 19-34.

51. The cooling system of any one of the preceding items, further comprising a separate heating device adapted to receive the cooling device and heat the reactor while the chamber is in contact with a cooling source, such as ambient air. 52. The cooling system of item 51, wherein the heating device comprises recesses adapted to receive the cooling device.

53. The cooling system of item 51 or 52, wherein the heating device is a cooker adapted to simultaneously heat a cooking utensil and the reactor of the cooling device.

54. The cooling system of any one of items 51-53, wherein the reactor extends in a first plane and the chamber extends in a second plane, which is approximately parallel to the first plane and, when the cooling device is received by the burner, the planes are approximately horizontal and the first plane is located above the second plane.

55. The cooling system of any one of items 51-54, wherein the heating device comprises a burner.

56. The cooling system of item 55, wherein the reactor is located closer to a flame of the burner than the chamber when the cooling device is received by the heating device.

57. The cooling system of any one of items 55-56, wherein the burner is a liquid fuel burner.

58. The cooling system of item 57, wherein the liquid fuel is methanol or ethanol. 59. The cooling system of any one of items 51-58, wherein the heating device comprises a detachable and replaceable fuel canister.

60. The cooling system of any one of items 51-59, wherein the heating device is the cooker according to any one of items 35-38.

61. Use of a cooling device of any one of items 1-18 for cooling the contents of a cooling box.

62. Use of a cooker according to any one of items 35-38 for

regenerating a cooling device of anyone of claims 1-18. 63. Method of cooling contents of a cooling box of anyone of items 19- 34, comprising the steps of:

a) arranging a cooling device according to anyone of items 1-18 such that it is received by the groove of the cooling box; and

b) allowing the liquid in the chamber to evaporate in a closed configuration of the cooling box to cool contents of the cooling box.

64. Method according to item 63, further comprising the step of regenerating the cooling device by heating the reactor before step a).

65. Method according to item 64, wherein a cooker of anyone of items 35-38 is used for heating the reactor.

Generally, all terms used in the items are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the element, apparatus, component, means, step, etc." are to be interpreted openly as referring to at least one instance of the element, apparatus, component, means, step, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is now described, by way of example, with reference to the accompanying drawings, in which:

Fig. 1 is a perspective view of a cooker according to the present disclosure.

Fig. 2a-2c are perspective views of various embodiments of a cooling device according to the present disclosure.

Fig. 3a is a perspective view of an embodiment cooling box according to the present disclosure and a section view of such an embodiment which has received a cooling device according to the present disclosure. Fig. 3b is a perspective view of another embodiment cooling box according to the present disclosure and a section view of such an embodiment which has received a cooling device according to the present disclosure.

Fig 4. is a perspective view of a cooker according to the present disclosure, which has received a cooling device according to the present disclosure and onto which a pot is placed.

Fig. 5 shows perspective views of two embodiments of a cooling device according to the present disclosure comprising a vertical wall.

DETAILED DESCRIPTION

As a first aspect of the present disclosure, there is provided a portable cooling device comprising a fluid, a reactor containing a sorbent capable of sorption and desorption of the fluid and a chamber for condensation and evaporation of the fluid, said reactor and said chamber being connected such that the fluid may flow between them. The fluid may comprise water and in such case, the sorbent is capable of sorption and desorption of gaseous water. The sorbent may be an absorbent or an adsorbent. Examples of sorbents are hygroscopic salts and microporous material, such as zeolite. When the reactor of the cooling device is heated, fluid desorption occurs and the gaseous fluid from the reactor condenses in the chamber. Thereby, the cooling device is regenerated. When the chamber of the regenerated cooling device is placed inside a cooling box, heat from the cooling box interior is used in the chamber for evaporating the fluid, which is resorbed by the sorbent. Thus, the resorption process drives the cooling inside the box.

Preferably, the pressure in the cooling device is below atmospheric pressure to facilitate the thermodynamic processes therein. For example, the pressure may be such that the fluid has a boiling point between -10 °C and +5 °C, such as about o °C. One example of a suitable sorption/desorption process is Climate Well's technology using a hygroscopic salt and an appropriate liquid, such as LiCl-water, see e.g. WO0037864 and US 2009/0249825. Thus, the cooling device of the first aspect is an independent unit that may be easily moved by the user between a heating source and a cooling box. The cooling device is normally of a size that is easy to handle for the user.

In one embodiment of the first aspect, a closable valve is arranged in the connection between the reactor and the chamber. Thus, the cooling capacity may be stored as in a battery after regeneration of the cooling device. Only after the valve has been opened, the cooling action begins as fluid evaporating in the chamber is allowed to flow into the reactor. Thus, the cooling capacity may be employed when needed and not only shortly after regeneration. The valve may for example be a ball valve. Such a ball valve may be arranged such that the valve is open if the cooling device is lying on one side and closed if the cooling device is flipped upside-down. In such case, the cooling device may be laid upside-down after heating/regeneration awaiting use for cooling.

In an embodiment of the first aspect, the reactor extends in a first plane and the chamber extends in a second plane, which is approximately parallel to the first plane. Such an embodiment allows the chamber to be located inside a cooling box while the reactor, which needs cooling, is located on the outside. Further, it allows the reactor to be placed close to a heating source while the chamber, which needs cooling during the regeneration, is below the heat source and thus further away from it.

In the context of the present disclosure, "approximately parallel" planes refers a maximum angle between the planes of 6° or less, preferably 5⁰ or less, more preferably 3⁰ or less.

The reactor and/or the chamber are preferably elongated, such as tube- shaped. Such shapes are relatively easy to manufacture. The elongated reactor may for example be curved or bent such that it is adapted to at least partly encircle a heat source, such as a flame. Thus, the reactor may cover a relatively large area around the flame of a burner in a stove, while a cooking utensil is placed above the flame. Thus, the heat not transferred to the cooking utensil, i.e. the heat not used for cooking ("waste heat"), may be taken up by the reactor. Thus, such a shape provides for efficient use of the available fuel. Also, the elongated chamber may be curved or bent that it is adapted to at least partly encircle the burner providing the flame. Such a chamber shape provides for efficient use of the space already occupied by a stove on which the burner is arranged. Also, the rounded or bent shape provides for increased safety as no parts of the cooling device points out from the stove and risks that the stove and/or cooking utensil is tilted during cooking. Accordingly, the reactor and/or the chamber may be ring-shaped, such that the reactor may form a ring around the flame and the chamber may form a ring around the burner. The elongated reactor and/or chamber may have the form of a full/ continuous ring or an interrupted/non-continuous ring. In the latter case, the reactor and/or chamber is/are claw-shaped. Also, the reactor may have an oval shape such that some parts of the reactor may come closer to the flame and thus be exposed to a higher temperature. The oval reactor may also be full/continuous or interrupted/non -continuous (claw-shaped).

To be closer to the flame, the reactor may be bent or curved to a larger degree than the chamber, which is to be cooled during regeneration. Thus, when both the reactor and the chamber have the shape of ring, an oval or a claw, the elongated reactor may define a first area, which is smaller than a second area defined by the elongated chamber. For example, the second area may be at least 30 %, such as at least 50 %, such as at least 70 %, larger than the first area. Normally, the first area being smaller than the second area means that the elongated reactor is shorter than the elongated chamber. In some cases, the inner volume of the reactor shall be at least the same as, but preferably larger than, the inner volume of the chamber, which means that the average cross section area of the reactor will be larger than the average cross section area of the chamber.

For example, the cross section area of the elongated chamber along at least half of its length may be 2-9 cm², such as 2-6 cm², such as 3-5 cm² and the cross section area of the elongated reactor along at least half of its length may be 2-10 cm², such as 2.5-7 cm², such as 3-6 cm². The volume of the chamber may be 100-500 cm3, such as 150-300 cm3 and the volume of the reactor may be 100-700 cms, such as 150-500 cms, such as 150-400 cm3. As mentioned above, the inner volume of the reactor may be larger than the inner volume of the chamber, such as at least 10 % larger. To aid handling of the cooling device, it may comprise at least one handle. For example, it may comprise at least two handles radially extending from the chamber. Thus, the cooling device may be safely handled with both hands. Also, the handle may be arranged at the connection between the reactor and the chamber. Each handle is preferably provided with insulation to reduce heat transfer from the cooling device to a hand holding the handle.

In one embodiment, cooling device according comprises a vertical wall. For example, the vertical wall may be arranged outside the reactor, but inside the chamber, such that the wall is a heat barrier between the reactor and the chamber. It follows that when the reactor and the chamber are circular or ring-shaped, the vertical wall preferably has a circular or ring-shaped radial cross-section. The vertical wall may for example be provided with a plurality of ventilation openings.

The vertical wall is preferably arranged such that a gap is provided between the plane formed by the upper edge of the vertical wall and the top of the reactor. Accordingly, exhaust fumes may flow between the top of the reactor and the bottom of a cooking utensil/pot placed on the vertical wall.

The vertical wall creates an "oven" under the cooking utensil/pot 41 that may provide for a more efficient heating of the reactor 21 (which is located inside the "oven") and/or the cooking utensil/pot 41. The height of the vertical wall may for example be 3-30 cm, such as 5-20 cm.

Further, the vertical wall may be composed of metal sheet material.

As a second aspect of the present disclosure, there is provided an openable cooling box comprising insulating walls forming an interior space for cooling, wherein a portion of a wall of the cooling box is adapted to receive a portable cooling device comprising a reactor extending in a first plane, an evaporation and condensation chamber extending in a second plane, which is approximately parallel to the first plane and a connection between the reactor and the chamber, such that, in a closed configuration of the cooling box, heat may be transferred from the interior space to the chamber and from the reactor to an exterior cooling source, such as ambient air. The wall portion adapted to receive a portable cooling device may for example comprise a groove extending from an edge of the wall into the wall. Thereby, the groove is adapted to receive the connection such that the chamber is located inside the cooling box and the reactor is located outside the cooling box in the closed configuration. The groove may be provided in the top wall (e.g. the lid). Also, the groove may be provided in a side wall. If the groove is provided in the side wall, it is preferably extending downwardly from the upper edge of the side wall, such that the cooling device hangs in the groove. A benefit of providing the groove in the top wall/lid or at the upper edge of a side wall is that the chamber of the cooling box is positioned in the upper part of the interior of the cooling box during cooling, which facilitates efficient cooling and allows for efficient utilization of the interior space as the bottom of the cooling box interior is not occupied. Providing the groove in the lid is particularly beneficial in this regard. A sealing device may be arranged at the groove to prevent air leakages through the groove when it has received the connection.

If the top wall is a lid, the lid may be hinged or completely removable.

It may be that the distance between the chamber and the reactor of the cooling device is limited, for example by the space available between the hob of a stove and a cooking utensil placed on the stove above a burner. At the same time, a certain wall thickness may be required to provide sufficient insulation. In one embodiment, the wall portion adapted to receive the cooling device may therefore have a reduced thickness compared to the rest of the wall. Alternatively, it may have a reduced thickness compared to an average thickness of the walls of the cooling box. The reduced thickness may for example be a reduction of at least 4 mm, such as at least 8 mm, such as at least 12 mm.

It may be beneficial if the cooling device can be locked in a position where it is received by the cooling box, in particular if it is received by the lid (when the cooling device is hanging on the wall, there is less need for a locking mechanism). Therefore, the wall portion adapted to receive the cooling device may comprise an elevation extending from the plane of the wall, wherein a recess adapted to receive part of the reactor provided at the top of the elevation. Such an elevation may be provided on the inside or the outside of the wall. However, if it is provided on the inside, the recess is adapted to receive part of the chamber. For example, a part of the elevation between the recess and the edge from which the groove extends is tapering towards the edge from which the groove extends such that the height of the elevation is gradually increasing in a direction away from the edge in question. Another benefit of the elevation is that the reactor (if the elevation is provided on the outside) or the chamber (if the elevation is provided on the inside) is lifted from the wall such that heat transfer between the reactor or chamber and the wall is reduced.

Sufficient insulation may be obtained if the average thickness of the walls is 2-7 cm, such as 3-6 cm. The wall may for example comprise polyurethane foam (PUR foam) or styrofoam® as insulating material. The insulating material may be covered by sheets of plastic or metal. Examples of suitable inner volumes of the cooling box are 20-100 liters, such as 20-60 liters, such as 20-40 liters. To facilitate a high cooling effect inside the box, a heat-exchanging plate composed of a heat-conducting material, such as a metal, may be arranged on the outside of the wall such that said heat-exchanging plate is in physical contact with the reactor when the cooling device is received by the cooling box. Such a heat-exchanging plate increases the surface area employed for cooling the reactor and a more efficient cooling of the reactor drives the evaporation in the chamber and thus the cooling inside the box.

The same type of heat-exchanging plate may be provided on the inside of the wall to increase the area available for transfer of heat to the chamber inside the box.

The heat-exchanging plate may be distanced from the wall by spacers, which further increases the available surface area. In such an embodiment, the distance between the heat-exchanging plate and the wall may for example be 2-10 mm, such as 2-6 mm.

However, the heat-exchanging plate may also be distanced from the inside of the wall to such a degree that a slot adapted to receive the chamber is formed between the wall and the plate. In such case, the width of the slot may be approximately the same as the width of the chamber (the outer diameter of the chamber in case of a circular cross section). Thus, the width of the slot may for example be 15-50 mm, such as 20-40 mm. Such a slot may function as a locking mechanism. Also, the slot reserves a space for the cooling device even if the cooling box is filled with contents (e.g. produce) before the cooling device is put into place. Such a reserved space may be particularly beneficial if the cooling device is received by a side wall of the cooling box.

Likewise, the heat-exchanging plate may be distanced from the outside of the wall to such a degree that a slot adapted to receive the chamber is formed between the wall and the plate. In such case, the width of the slot may be approximately the same as the width of the reactor (the outer diameter of the reactor in case of a circular cross section). Thus, the width of the slot may for example be 15-50 mm, such as 20-40 mm. Such an outside slot may also function as a locking mechanism. l8

The width of the groove is preferably adapted to size of the connection. For example, it may approximately correspond to the outer diameter of the connection in case the connection has a circular cross section. Thus, the width of the groove may for example be 15-50 mm, such as 20-40 mm. The depth of the groove may be adapted to the size of the connection and optionally the thickness of the wall that meets the groove. The depth of the groove may for example be 15-80 mm, such as 15-70 mm, such as 25-70 mm.

The depth of the groove may be reduced if the wall that meets the groove comprises a second groove such that a common space for receiving the cooling device is formed in the closed configuration of the cooling box.

As a third aspect of the present disclosure, there is provided a cooker adapted to receive a portable cooling device comprising a reactor extending in a first plane, an evaporation and condensation chamber extending in a second plane, which is approximately parallel to the first plane and a connection between the reactor and the chamber, said cooker comprising a metal frame having mainly vertical walls continuing into a mainly horizontal hob, the frame enclosing a burner and being adapted to enclose a fuel canister/container, wherein the frame is a bottomless frame formed of one piece so as to allow replacing of the fuel canister/container from the bottom side of the frame, said cooker further comprising one or several cooking utensil supports having an upper edge for supporting a cooking utensil in a position above the burner, the upper edge being provided with at least one recess for receiving the reactor of the cooling device. The cooker of the third aspect may for example be a cooker according to WO 02/084175, provided that the cooking utensil supports (denoted 47 in WO 02/084175) are provided with at least one recess for receiving the reactor. Further, the cooker of WO 02/084175 may be provided with a recess in the wind protecting part (denoted 49 in WO 02/084175) for receiving the connection when used according to the third aspect.

Also, the cooker of the third aspect may for example be a cooker according to WO 2008/058566, provided that the cooking utensil supports (denoted 6 in WO 2008/058566) are provided with at least one recess for receiving the reactor. Further, the cooker of WO 2008/058566 may be provided with a recess in the wind protector (denoted 7 in WO 2008/058566) for receiving the connection when used according to the third aspect.

The depth of the at least one recess in the cooking utensil supports may be such that the reactor is not in contact with the cooking utensil when the reactor is received by the recess(es) and the cooking utensil is supported by the upper edge of the cooking utensil supports in the position above the burner. Thus, the depth of the recess(es) may for example be 15-50 mm, such as 20-40 mm. The cooker of the third aspect may for example comprise at least one hob recess provided in the hob to receive the chamber. Thus, the cooling device may be stabilized in the received position. Further, when the chamber rests in such (a) hob recess(es), heat may be transferred from the chamber to the metal frame of the cooker. Thus, the metal frame may contribute to the cooling of the chamber (in which the fluid condenses), which facilitates an efficient regeneration process.

As a fourth aspect of the present disclosure, there is provided a cooling system, comprising:

The chamber is preferably located inside the cooling box and the reactor is located outside the cooling box when the cooling box in a closed

configuration has received the cooling device.

As mentioned above in connection with the first aspect, the reactor of the cooling device may extend in a first plane and the chamber of the cooling device may extend in a second plane, which is approximately parallel to the first plane. In such an embodiment, the distance between the reactor and the chamber in the direction perpendicular to the planes may be approximately the same as the thickness of a wall portion of the cooling box adapted to receive the cooling device. If the wall portion includes one or two heat- exchanging plates (see below), the relevant thickness is that including the heat-exchanging plate(s) and the spacers, if any, provided that the heat- exchanging plate(s) is not forming (a) slot(s) for receiving the cooling device.

As mentioned in connection with the second aspect, the average thickness of the walls of the cooling box of the fourth aspect may be 2-7 cm, such as 3-6 cm and the inner volume of the cooling box of the fourth aspect may be 20- 100 liters, such as 20-60 liters, such as 20-40 liters. As also mentioned in connection with the second aspect, a heat-exchanging plate composed of a heat-conducting material, such as a metal, may be arranged on an outer wall of the cooling box of the fourth aspect. The outer heat-exchanging plate is in physical contact with the reactor when the cooling device is received by the cooling box. Likewise, a heat-exchanging plate composed of a heat- conducting material, such as a metal, may be arranged on an inner wall of the cooling box. Such an inner heat-exchanging plate is in physical contact with the chamber when the cooling device is received by the cooling box. The outer or inner heat-exchanging plate may be distanced from the wall by spacers. The distance between the heat-exchanging plate and the wall may be 2-10 mm, such as 2-6 mm. As discussed above in connection with the second aspect, the heat- exchanging plate may alternatively be distanced from the inside of the wall to such a degree that a slot adapted to receive the chamber is formed between the wall and the plate. In such case, the width of the slot may be

approximately the same as the width/thickness of the chamber (the outer diameter of the chamber in case of a circular cross section). Thus, the width of the slot may for example be 15-50 mm, such as 20-40 mm.

Likewise, the heat-exchanging plate may be distanced from the outside of the wall to such a degree that a slot adapted to receive the chamber is formed between the wall and the plate. In such case, the width of the slot may be approximately the same as the width/thickness of the reactor (the outer diameter of the reactor in case of a circular cross section). Thus, the width of the slot may for example be 15-50 mm, such as 20-40 mm.

The top wall of the cooling box of the fourth aspect may be a lid allowing the cooling box to be opened.

The cooling device of the cooling system of the fourth aspect may for example be the cooling device of the first aspect (see above). Likewise, the cooling box of the cooling system of the fourth aspect may for example be the cooling box according to the second aspect (see above). In embodiments of the fourth aspect, the cooling system further comprises a separate heating device adapted to receive the cooling device and heat the reactor while the chamber is in contact with a cooling source, such as ambient air. Such a heating device may comprise recesses adapted to receive the cooling device. The heating device of the fourth aspect may for example be a cooker adapted to simultaneously heat a cooking utensil and the reactor of the cooling device. Thus, waste heat from the cooking may be recovered. Alternatively, the heating device is an arrangement adapted to exclusively regenerate one or more cooling devices. Such an arrangement may for example be a central unit adapted to regenerate cooling devices from several users/families. The central unit may use locally available fuel, such as biomass (e.g. wood) or locally produced biogas.

When the reactor of the cooling device of the fourth aspect extends in a first plane and the chamber of the cooling device of the fourth aspect extends in a second plane, which is approximately parallel to the first plane and the cooling device is received by the burner, the planes are preferably

approximately horizontal and/or the first plane is preferably located above the second plane. Thus, the reactor in the first plane may be placed closer to the heat source than the chamber in the second plane, which ends up in a position below the heat source. The heating device of the fourth aspect may comprise a burner. Thus the reactor may be located closer to a flame of the burner than the chamber when the cooling device is received by the heating device. The burner may be a liquid fuel burner. The liquid fuel may be methanol or ethanol, which may be obtained from renewable resources. Further, methanol may be produced from waste streams in the oil industry. The heating device may for example comprise a detachable and replaceable fuel canister.

The heating device of the cooling system of the fourth aspect may for example be the cooker according to the third aspect. The invention will now be described more fully hereinafter with reference to the accompanying drawings, in which certain embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth below; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout the description.

A cooker according to the present disclosure is shown in Fig. 1. The cooker comprises a bottomless frame 10. This frame may be manufactured in one piece, preferably by deep drawing, and consists of for instance stainless steel in order to withstand corrosion as far as possible. The frame may also consist of aluminum. The frame may at its lower part rest on an outwardly flanged foot portion 11 and has a surrounding mainly vertical wall 12 continuing into a horizontal hob 13. The hob 13 may comprise a recess 14 adapted to receive the chamber of a cooling device of the present disclosure. The recess is preferably circular. When chamber is received by the recess, the frame may function as a cooling element for the chamber. The side portions of the vertical wall 12 may have several small openings 12a through which combustion air may flow into the frame. Cooking utensil supports 15 are arranged on the upper side of the hob 13. The cooking utensil supports in Fig. 1 comprise three radially (with respect to the burner) directed plates.

However, it may instead comprise four, five or six radially directed plates. The upper edge of each plate comprises a recess 16 adapted to receive the reactor of a cooling device of the present disclosure. A burner tube 17 is arranged centrally in the frame. Above the burner tube 17, a flame spreader 18 is arranged. The flame spreader 18 comprises a U- or Ω- shaped strip for securing to the hob 13 of the frame 10.

A wind protector 19 is arranged around the burner tube 17, preferably outside the cooking utensil supports 15. The wind protector may be a circular plate, which may be perforated. The upper edge of the wind protector may comprise a recess 19a adapted to receive the connection of a cooling device of the present disclosure.

Fig. 2a-2c shows various embodiments of a cooling device according to the present disclosure. A reactor 21 comprising a sorbent extends in a first plane and the chamber 22 for condensation and evaporation of a fluid extends in a second plane, which is approximately parallel to and below the first plane. In the first plane, the reactor defines a first area Ai, which is smaller than a second area A2 defined by the chamber in the second plane (see e.g. 2a: vi and 2c: v). The reactor 21 and the chamber 22 is connected by a connection 23, in which a valve 24 may be arranged (see 2a: i, ii and iii; 2b: i and ii; and 2c: i, ii and iv) . The valve 24 may be opened and closed by hand.

The cross section of the reactor 21 and/or the chamber 22 may for example be circular 25 or oval 26.

The cooling device may comprise one or more handles 27, which may be provided on the chamber 22 such that the cooling device may be conveniently put in place and removed (e.g. from the cooker) using two hands. Thus, the handles 27 may radially extend from the chamber. The reactor 21 may form a full ring (see 2a: i, ii, iv and v; and 2c: i, ii and iii). The ring-shaped reactor may be circular (see 2a: i, ii, iv and v) or oval (see 2c: i, ii and iii). Alternatively, the reactor 21 may form an interrupted ring/claw (see 2a: iii, vi and vii; and 2c: iv and v). The ring-shaped reactor may be circular (see 2a: iii, vi and vii) or oval (see 2c: iv and v). The chamber 22 is preferably circular. The circular chamber may form a full ring (see 2a: i, ii, iv and v; and 2c: i, ii, and iii). Alternatively, the circular chamber forms an interrupted ring/claw (see 2a: iii, vi and vii; and 2c: iv and v) .

The rings of the reactor and the chamber are preferably concentric such that they have a common central point. The connection 23 may be designed to connect the shortest distance between the reactor 21 and the chamber 22 (see 2a: i, ii, iii, iv and vi; 2b and 2c). In such case, the connection may be a straight tube. However, to reduce the necessary depth of the groove in the cooling box that receives the cooling device, the connection may have an alternative shape, such as an L-shape (e.g. one right angle, see 2a: v) or an U- shape (e.g. two right angles, see 2a: vii). The connection may also be curved (not shown). The cooling device may also consist of a single tube bent and curved to form the circular reactor in the first plane and the circular chamber in the second plane (see 2b).

Fig. 3a shows a cooling box 30 according to the present disclosure comprising four side walls 31 and a lid 32. A groove 33 is provided in the upper edge of one of the side walls 31. The groove 33 is adapted to receive the connection 23 of the cooling device 20. The width (w) of the wall at the groove is

approximately the same as the distance (d) between the reactor 21 and the chamber 22 in the cooling device 20. Fig. 3b shows another cooling box 34 according to the present disclosure comprising four side walls 35 and a lid 36. A groove 37 is provided in an edge of the lid 36. The groove 37 is adapted to receive the connection 23 of the cooling device. Further, an elevation 38 is provided at the top of the lid 36. The elevation 38 is tapering towards the groove 37. At the top of the elevation 38, a recess 39 is provided such that the cooling device 20 may be locked in a received position.

The thickness/width (w) of the lid at the groove 37 is approximately the same as the distance (d) between the reactor 21 and the chamber 22 in the cooling device 20. However, the thickness/width (w') of the lid 36 at the top of the elevation 38 is greater than the distance (d) between the reactor 21 and the chamber 22 in the cooling device 20.

Fig 4 shows a cooking utensil/pot 41 placed on the cooker, such that the pot 41 may be heated by a flame 40 of the cooker. In Fig. 4, the cooling device 20 is simultaneously regenerated by the cooker. Heat from the flame 40 is transferred to the cooling device's reactor 21, which is received by the recesses 16 in the cooking utensil supports 15. The depth of the recesses 16 is such that a small space is left between the bottom of the pot 41 and the top of the reactor 21. Flue gases may thus flow between the bottom of the pot 41 and the top of the reactor 21 when the flame 40 is burning. The connection 23 of the cooling device is received by the recess 19a in the wind protector 19. Also, the chamber 22 of the cooling device is received by the recess 14 in the hob 13·

Fig 5 shows embodiments of a cooling device according to the present disclosure. The embodiments comprise a vertical wall 50 arranged outside the reactor 21, but inside the chamber 22. The vertical wall 50 is preferably circular when the reactor 21 and the chamber 22 are circular or ring-shaped. The connection 23 between the chamber 22 and the reactor 21 may penetrate 54 the vertical wall 50. Alternatively, the connection 23 may be arranged in a slot 55 in the vertical wall 50. In the embodiment of Fig 5b, the lower edge 56 of the vertical wall 50 can rest on a horizontal hob surface 13 or cooking utensil supports 15 of a cooker 10. In the embodiment of Fig 5a, legs 51 or feet can rest on a horizontal hob surface 13 or cooking utensil supports 15 of a cooker 10. The vertical wall 50 may be provided with a plurality of ventilation openings 52. A cooking utensil/pot 41 may be placed on the vertical wall 50 such that the bottom of the cooking utensil/pot 41 contacts the upper edge 53 of the vertical wall 50. The height of the vertical wall 50 is preferably such that a gap is provided between the bottom of the cooking utensil/pot 41 placed on the vertical wall and the top of the reactor 21. Accordingly, exhaust fumes may flow between the top of the reactor 21 and the bottom of the cooking utensil/pot 41. This means that the top of reactor 21 is preferably below the upper edge 53 of the vertical wall.

The vertical wall creates an "oven" under the cooking utensil/pot 41 that may provide for a more efficient heating of the reactor 21 (which is located inside the "oven") and/or the cooking utensil/pot 41.

Claims

1. A portable cooling device comprising a fluid, a reactor containing a sorbent capable of sorption and desorption of the fluid and a chamber for condensation and evaporation of the fluid, said reactor and said chamber being connected such that the fluid may flow between them, wherein:

the reactor extends in a first plane and the chamber extends in a second plane, which is approximately parallel to the first plane;

the chamber is elongated; and

the elongated chamber is curved or bent such that it is adapted to at least partly encircle a burner providing a flame.

2. The cooling device of claim 1, wherein the chamber is ring-shaped.

3. The cooling device of claim 1 or 2, wherein the reactor is elongated.

4. The cooling device of claim 3, wherein the elongated reactor is curved or bent such that it is adapted to at least partly encircle a flame for heating the reactor.

5. The cooling device of claims 4, wherein the reactor is ring-shaped.

6. An openable cooling box comprising insulating walls forming an interior space for cooling, wherein a portion of a wall of the cooling box is adapted to receive a portable cooling device comprising a reactor extending in a first plane, an evaporation and condensation chamber extending in a second plane, which is approximately parallel to the first plane and a connection between the reactor and the chamber, such that, in a closed configuration of the cooling box, heat may be transferred from the interior space to the chamber and from the reactor to an exterior cooling source, such as ambient air,

wherein the wall portion comprises a groove extending from an edge of the wall into the wall, said groove being adapted to receive the connection such that the chamber is located inside the cooling box and the reactor is located outside the cooling box in the closed configuration and

wherein the wall portion has a reduced thickness compared to the rest of the wall.

7. The cooling box according to claim 6, wherein the wall portion comprises an elevation extending from the plane of the wall and a recess adapted to receive part of the reactor is provided at the top of the elevation such that the cooling device may be locked in a received position.

8. The cooling box according to claim 7, wherein a part of the elevation between the recess and the edge from which the groove extends is tapering towards the edge from which the groove extends.

9. The cooling box of any one of claims 6-8, wherein an edge of a second wall comprises a second groove that meets the groove of the wall in the closed configuration and forms a common receiving space for the cooling device.

10. A cooling system, comprising:

a portable cooling device according to any one of claims 1-5; and an openable cooling box comprising insulating walls forming an interior space for cooling, said cooling box being adapted to receive the cooling device such that, in a closed configuration of the cooling box, heat may be transferred from the interior space to the chamber and from the reactor to an exterior cooling source, such as ambient air.

11. The cooling system of claim 10, wherein the reactor extends in a first plane and the chamber extends in a second plane, which is

approximately parallel to the first plane and the distance between the reactor and the chamber in the direction perpendicular to the planes is

12. The cooling system of claim 10 or 11, wherein the cooling box is the cooling box according to anyone of claims 6-9.

13. The cooling system of any one of claims 10-12, further comprising a separate heating device adapted to receive the cooling device and heat the reactor while the chamber is in contact with a cooling source, such as ambient air.

14. The cooling system of claims 13, wherein the heating device is a cooker adapted to receive the portable cooling device comprising, said cooker comprising a metal frame having mainly vertical walls continuing into a mainly horizontal hob, the frame enclosing a burner and being adapted to enclose a fuel container, wherein the frame is a bottomless frame formed of one piece so as to allow replacing of the fuel canister from the bottom side of the frame, said cooker further comprising one or several cooking utensil supports having an upper edge for supporting a cooking utensil in a position above the burner, the upper edge being provided with at least one recess for receiving the reactor of the cooling device.

15. The cooling system of claim 14, wherein at least one hob recess is provided in the hob of the cooker to receive the chamber.