Refrigeration circulating thermostat

Abstract

The invention relates to a liquid bath (105) for tempering a sample, a cooling device (200) arranged in the liquid bath (105) and a circulation thermostat (110) with a pump (115) for circulating the liquid bath (105), wherein the cooling device (200) comprises a coolant-carrying tube (205) with a tube cross-section (210), wherein the tube (205) forms a coil (215) at least in sections.

Description

[0001] The invention relates to a refrigerated circulating thermostat. In particular, the invention relates to a refrigerated circulating thermostat comprising a liquid bath for controlling the temperature of a sample, a cooling device arranged in the liquid bath, and a circulating thermostat with a pump for circulating the liquid bath. The cooling device comprises a refrigerant-carrying tube with a tube cross-section, wherein the tube forms a coil at least in sections.

[0002] To examine samples, such as biological material, it is often necessary to bring them to a specific temperature. After collection, these samples can be placed in a container, such as a test tube. This container can then be placed in a liquid bath. By precisely controlling the temperature of the liquid bath, the sample can be brought to a desired target temperature.

[0003] Refrigerated circulating thermostats can be used to achieve precise temperature control of the liquid bath. The cooling device of such a refrigerated circulating thermostat can be designed to effectively cool the liquid bath and thus quickly bring the sample to the desired target temperature. Cooling devices, more commonly referred to as heat exchangers, are available in various designs and for a wide variety of applications.

[0004] German patent application DE 10 2005 021 610 A1 discloses a heat exchanger with two tube sections, each wound helically into a coil, for conveying a heat transfer fluid. The coils are nested within each other. Furthermore, the coils can have a cross-section that remains constant in the longitudinal direction and / or can be cuboid-shaped. A disadvantage of this type of cooling device or heat exchanger is its complex structure with at least two tube sections. Furthermore, such a heat exchanger is intended for use in a flow channel.

[0005] The object of the present invention is to provide a refrigeration circulating thermostat which enables an improved ratio of filling quantity to cooling capacity with a compact design of the evaporator.

[0006] The invention solves this problem by means of the subject matter of the independent claims. Further embodiments and additional features emerge from the subclaims and the following description.

[0007] According to a first aspect of the present invention, a refrigeration circulating thermostat is provided, comprising a liquid bath for tempering a sample, a cooling device arranged in the liquid bath and a circulating thermostat with a pump for circulating the liquid bath, wherein the cooling device has a coolant-carrying tube with a tube cross-section, wherein the tube forms a coil at least in sections and the tube cross-section has a main tube axis and a secondary tube axis, wherein the extension of the tube cross-section in the main tube axis is smaller than the extension of the tube cross-section in the secondary tube axis.

[0008] The liquid bath can contain a variety of different liquids. For example, the liquid bath can contain water or a solution. Furthermore, the liquid bath can also contain mixtures. The sample or a vessel containing the sample can be placed in the liquid bath. The sample can thus assume the same temperature as the liquid bath. The liquid bath can be open or closed.

[0009] The cooling device can dissipate heat from the liquid in the liquid bath to the outside. To do this, the refrigerant flowing through the pipe of the cooling device can absorb heat from the liquid in the liquid bath and release it back outside. To do this, the cooling device can be in direct contact with the liquid. Different refrigerants can be used. The refrigerant can also assume different states of aggregation. For example, the refrigerant can initially be a liquid and then, after absorbing heat from the liquid, become a gas. In other words, the refrigerant can evaporate. The cooling device can therefore also be referred to as an evaporator or flat tube evaporator. Mixed forms of aggregation states are also possible. The refrigerant can be a natural refrigerant and / or a refrigerant with a low greenhouse effect. For example, the refrigerant can be propene.The refrigerant may have a Global Warming Potential (GWP) value of less than or equal to 2.

[0010] The circulating thermostat can control or regulate the temperature of the liquid bath. The circulating thermostat can detect the current temperature of the liquid bath. Furthermore, the circulating thermostat can take measures to maintain the temperature at a specific value. The circulating thermostat can also take measures to achieve a target temperature.

[0011] For example, the circulating thermostat can detect a liquid bath temperature that is higher than the target temperature. The circulating thermostat can then use the cooling device to lower the liquid bath temperature. To do this, the amount of refrigerant flowing through the tube can be increased. A higher volume flow of refrigerant through the tube allows more heat to be removed from the liquid.

[0012] Furthermore, the circulation thermostat can circulate or mix the liquid using the pump. To do this, the pump can transport the liquid located at the bottom of the liquid bath to the upper area of ​​the liquid bath. For example, the pump outlet can be directed downwards, so that the liquid in the upper area of ​​the liquid bath is transported downwards while simultaneously allowing liquid to flow upwards from the bottom. Furthermore, the pump outlet can be aligned in such a way that a vortex is created in the liquid. The pump output can be adjusted to achieve appropriate mixing of the liquid.

[0013] Circulation or mixing can also result in better flow around the cooling device. In other words, circulation can increase the turbulence of the liquid in the liquid bath. Circulation can ensure a homogeneous temperature distribution in the liquid bath. Circulation usually allows the liquid to flow better around the coil of the cooling device. This means that circulation allows the liquid to flow more easily past the surface of the cooling device. It is possible that increased circulation can lead to increased flow around the cooling device. In other words, increased circulation can increase the volume flow of liquid flowing past the cooling device or coil. By increasing the flow around the cooling device, more heat can be dissipated from the liquid to the outside. The temperature of the liquid bath can therefore be reduced more efficiently through circulation.

[0014] The tube of the cooling device can have a coil or spiral structure, at least in certain sections. The cross-section of the coil can be essentially round or rectangular. The coil can provide particularly advantageous cooling performance. The coil can be realized in a compact design while simultaneously maintaining high performance. In other words, the tube can form a plurality of fins. Fluid can flow around the fins.

[0015] The ratio of the extension of the pipe cross-section in the direction of the pipe main axis to the extension of the pipe cross-section in the direction of the pipe minor axis is in particular less than 1:1. The ratio of the pipe main axis to the pipe minor axis can also be less than 1:2. Furthermore, the ratio can also be less than 1:3, 1:4 or even less. In a particular aspect of the present invention, the ratio between the extension of the pipe cross-section in the direction of the pipe main axis and the extension of the pipe cross-section in the direction of the pipe minor axis can be at least 8 mm to 4 mm. The ratio can further preferably be at least 8 mm to 3.25 mm. The ratio can particularly preferably be at least 10 mm to 3.75 mm. The ratio can further preferably be at least 10 mm to 2.7 mm.

[0016] A tube design in which the cross-section along the main axis is smaller than the cross-section along the secondary axis can offer a number of advantages. This ratio between the respective cross-sections along the main axis and secondary axis can provide a particularly compact and space-saving cooling device. This ratio can result in a larger surface area of ​​the tube. The ratio can also lead to a reduction in the required refrigerant charge. This ratio also makes it possible to achieve a good compromise between the smallest possible internal tube volume and an acceptable pressure drop in the cooling device.

[0017] The reduction of the pipe cross-section in the direction of the pipe's main axis can be achieved by squeezing a round pipe. A pipe with a round pipe cross-section can be squeezing or pressing in such a way that the pipe cross-section changes. Thus, a flat pipe can be created by squeezing a round pipe. Squeezing a round pipe can reduce the pipe's internal volume. This means that a flat pipe can have a smaller volume than a round pipe with the same surface area.

[0018] A key advantage of the refrigerated circulator can be the cooling device's advantageous ratio of large surface area to small volume. In other words, a tube with an extensive surface area and a limited volume can enable efficient heat exchange. This ratio, or structure, can allow an increased amount of heat or cooling energy to be transferred through the surface of the tube while simultaneously reducing the overall volume of the cooling device.

[0019] In a further aspect of the present invention, the coil may have a longitudinal axis and the longitudinal axis may extend substantially vertically in the installed position of the cooling device.

[0020] This arrangement of the cooling device allows the liquid bath and the interior of the coil to be accessed from above. In other words, a sample can be introduced from above into a section of the liquid bath, with the coil surrounding the area.

[0021] The helix can have a constant cross-section along its longitudinal axis. In other words, the helix can be shaped like a circular cylinder or a cuboid.

[0022] In a further aspect of the present invention, the main tube axis can be aligned substantially parallel to the longitudinal axis of the coil and, in particular, vertically in the installed position.

[0023] This arrangement of the cooling device allows the liquid bath and the interior of the coil to be reached and viewed from above, further simplifying the handling of a sample in the liquid bath.

[0024] In a further aspect of the present invention, the pipe major axis and pipe minor axis may be aligned substantially orthogonally to each other.

[0025] Such a configuration of the main and secondary tube axes allows for the formation of particularly advantageous fins for the cooling device. The fins can exhibit particularly advantageous flow characteristics. For example, the fins can ensure that the fluid is directed in one direction as it flows around the cooling device.

[0026] In a further aspect of the present invention, the pipe cross-section can be oval or rectangular with partial circle roundings.

[0027] In other words, the tube may have a substantially rectangular cross-section with rounded corners. The cross-section may have semicircular boundaries. The tube may be a flat tube with an oval or substantially rectangular cross-section.

[0028] In a further aspect of the present invention, the tube may have a tube length and a tube volume. The ratio of tube length to tube volume may be at least 200 1 / dm 2 , in particular at least 300 1 / dm 2 For example, the ratio can be 40 dm / 0.125 dm 2 Furthermore, the ratio of pipe length to pipe volume must be at least 3.82 m to 0.125 dm 2 For typical designs, the pipe length can range from 3 m to 8 m.

[0029] In a further aspect of the present invention, the coil may have a substantially rectangular or round coil cross-section.

[0030] In a further aspect of the present invention, the tube may comprise a tube inlet and a tube outlet. The tube inlet may be located below the tube outlet in the installed position of the cooling device.

[0031] The refrigerant can flow into the tube through the tube inlet. The refrigerant can then flow through the coil and exit the tube through the tube outlet. This flow pattern can allow for effective heat removal from the liquid bath as the refrigerant circulates through the coil. At the tube outlet, the refrigerant can be at an elevated temperature. The refrigerant discharged through the tube outlet can then be cooled in an external device, i.e., the temperature of the refrigerant can be reduced. The refrigerant can then be admitted back into the cooling device through the tube inlet, thus creating a cycle.

[0032] In a further aspect of the present invention, the liquid bath may have a connector. The liquid bath may be connectable to an external liquid bath or an external device by means of the connector.

[0033] In other words, the liquid in the liquid bath can be transported to other devices via the connection. This allows other devices to be tempered using the liquid in the liquid bath. The refrigeration circulator can thus be used as a controller and / or pump for an external device.

[0034] In a further aspect of the present invention, the circulation thermostat can protrude at least partially from above into the liquid bath.

[0035] For example, the circulation thermostat's pump can protrude from above into the liquid bath. This arrangement can have the advantage of making the circulation thermostat easy to install. For example, the circulation thermostat can be placed as a module on top of the liquid bath. This allows the circulation thermostat to be removed from the liquid bath at any time.

[0036] In a further aspect of the present invention, the circulation thermostat may comprise a heating device for heating the liquid bath.

[0037] The heating device can operate in a similar manner to the cooling device, with the heating device being designed for heating. This means that the heating device can increase the temperature of the liquid in the liquid bath. The circulating thermostat can, for example, detect a liquid bath temperature that is lower than the target temperature. The circulating thermostat can then increase the liquid bath temperature using the heating device.

[0038] Without a heating device, the refrigerated circulator can be used to cool the fluid. However, if it includes a heating device, the refrigerated circulator can also be used to heat the fluid.

[0039] In a further aspect of the present invention, the pump and / or the heating device of the circulating thermostat can be arranged in the liquid bath.

[0040] It is thus possible for the pump and the cooling device to be arranged directly in the liquid bath. The heating device can be located outside the liquid bath, but can be in heat exchange with it, particularly temporarily. Furthermore, it is possible for the heating device and the cooling device to be arranged in the liquid bath, with the pump outside the liquid bath. It is also possible for the pump, the cooling device, and the heating device to be arranged in the liquid bath. In particular, the respective devices are each operatively connected to the liquid bath for heat exchange or circulation.

[0041] In a further aspect of the present invention, the liquid bath may comprise a substantially rectangular or circular tub. The tube of the cooling device may run substantially parallel to the walls of the tub.

[0042] This type of cooling arrangement ensures optimal space utilization while simultaneously achieving a uniform cooling distribution along the sample. Furthermore, temperature differences within the sample can be minimized, thus achieving more precise results in experiments or processes. Furthermore, the cooling device can be easily installed in the tank. Another advantage can be the ease of maintenance and cleaning of the cooling device. The cooling device can be designed for easy installation, for example, by being designed to be inserted into the tank.

[0043] In a further aspect of the present invention, the circulating thermostat may comprise a control device and a display.

[0044] The control device can be configured to control or regulate the pump, the cooling device, and / or the heating device. The control device can be configured to communicate with the pump, the cooling device, and / or the heating device via an electronic connection. The control device can also be operated via the display. The display can be configured such that a user can operate the circulation thermostat via the display.

[0045] In a further aspect of the present invention, the refrigeration circulating thermostat may comprise a plurality of cooling devices arranged one above the other.

[0046] A plurality of stacked cooling devices can improve the cooling performance of the refrigeration circulator. Furthermore, such an arrangement can ensure a homogeneous temperature distribution in the liquid bath.

[0047] In general, features of the various exemplary aspects and / or embodiments described herein may be combined with one another unless clearly precluded in the context of the disclosure.

[0048] In the following part of the description, reference is made to the figures of an exemplary embodiment, which are shown to illustrate specific aspects and embodiments of the present invention. It is understood that other aspects may be utilized and structural or logical changes to the illustrated embodiments are possible without departing from the scope of the present invention. The following description of the figures is therefore not to be considered limiting.

[0049] This shows Fig. 1 a refrigerated circulating thermostat 100 with a liquid bath 105 for tempering a sample; Fig. 2A shows a cooling device 200 according to an exemplary embodiment of the invention; Fig. 2B the cooling device 200 according to the Fig. 2A illustrated embodiment in a plan view; Fig. 2C the cooling device 200 according to the Fig. 2A illustrated embodiment in a side view; Fig. 2D the cooling device 200 according to the Fig. 2A illustrated embodiment in a close-up view; Fig. 3 is a schematic representation of a tube cross-section 210 of the tube 205 according to an exemplary embodiment of the invention; Fig. 4A shows a cooling device 200 with a cylindrically shaped coil 215 according to another exemplary embodiment of the invention; Fig. 4B the cooling device 200 according to the Fig. 4A illustrated embodiment in a sectional view; Fig. 4C the cooling device 200 according to the Fig. 4A illustrated embodiment in an installed position; Fig. 5A is a schematic representation of a refrigeration circulator 100 according to another exemplary embodiment of the invention; Fig. 5B the refrigeration circulating thermostat 100 according to the Fig. 5A illustrated embodiment in an alternative view; Fig. 5C the refrigeration circulating thermostat 100 according to the Fig. 5A illustrated embodiment in an alternative view; Fig. 6A shows a separate cooling device 200 according to another exemplary embodiment of the invention; Fig. 6B a plurality of cooling devices 200 according to the Fig. 6A illustrated embodiment in installed position; and Fig. 6C a plurality of cooling devices 200 according to the Fig. 6A illustrated embodiment in installed position and in an alternative view.

[0050] In the following, identical reference symbols refer to identical or at least functionally identical features.

[0051] Fig. Figure 1 shows a schematic view of a refrigerated circulating thermostat 100 with a liquid bath 105 for controlling the temperature of a sample. The refrigerated circulating thermostat 100 comprises a cooling device 200 arranged in the liquid bath 105 and a circulating thermostat 110 with a pump 115 for circulating the liquid bath 105. The refrigerated circulating thermostat 100 further comprises a heating device 120 for heating the liquid bath 105.

[0052] The circulation thermostat 110 is equipped with a control device 135 and a display 140. The circulation thermostat 110 can be operated by a user via the display 140. For example, the user can enter the target temperature of the liquid in the liquid bath 105.

[0053] The liquid bath 105 comprises a substantially rectangular tub 130. The tub 130 is filled with a liquid to cool the sample. The cooling device 200 is arranged in the tub 130. The cooling device 200 can thus cool the liquid in the tub 130 or in the liquid bath 105.

[0054] The cooling device 200 comprises a refrigerant-carrying tube 205, wherein the tube 205 forms a coil 215 at least in sections. The tube 205 of the cooling device 200 runs substantially parallel to the walls of the tub 130.

[0055] The user can place a sample or a vessel containing the sample in the liquid bath 105 or in the tub 130. The sample can thus assume the same temperature as the liquid bath 105. If the user wishes to change the temperature of the sample, they can enter the desired target temperature via the display 140. The control device 135 can then take measures to achieve the target temperature. For example, the control device 135 can cause the amount of refrigerant flowing through the cooling device 200 to be increased or decreased.

[0056] The pump 115 can circulate the liquid in the liquid bath 105. This circulation can ensure mixing and a homogeneous temperature distribution in the liquid bath 105. This ensures that the sample can also achieve a homogeneous temperature distribution.

[0057] Fig. 2A shows a cooling device 200 according to an exemplary embodiment of the invention. The cooling device 200 has a refrigerant-carrying tube 205, wherein the tube 205 forms a coil 215 at least in sections. The coil 215 has a spiral or helical structure.

[0058] The tube 205 comprises a tube inlet 235 and a tube outlet 240. In this embodiment, the tube inlet 235 is located below the tube outlet 240 in the installed position of the cooling device 200.

[0059] Fig. 2B shows the cooling device 200 according to the Fig. 2A in a plan view. The coil 215 winds around a longitudinal axis 230 that projects into the plane. The coil 215 has a coil cross-section 245 that remains constant in the direction of the longitudinal axis 230. The coil cross-section 245 is essentially rectangular, so that the coil 215 has a cuboid shape.

[0060] During operation of the refrigerated circulating thermostat 100, the sample can be positioned in the region of the longitudinal axis so that the sample is surrounded by the cooling device 200.

[0061] Fig. 2C shows the cooling device 200 according to the Fig. 2A in a side view. The longitudinal axis 230 runs essentially vertically in the installed position of the cooling device 200.

[0062] Fig. 2D shows the cooling device 200 according to the Fig. 2A shown embodiment in a close-up view or a detailed view of a section of Fig. 2C. The tube 205 has a tube cross-section 210 that is rectangular with partial circle roundings. The tube 205 can thus be referred to as a flat tube. The tube cross-section 210 has a tube main axis 220 and a tube minor axis 225, wherein the extension 220a of the cross-section 210 in the direction of the tube main axis 220 is smaller than the extension 225a of the cross-section 210 in the direction of the tube minor axis 225. The tube main axis 220 and the tube minor axis 225 are aligned substantially orthogonally to one another. In this embodiment, the tube main axis 220 is aligned substantially parallel to the longitudinal axis 230 of the coil 215 and, in the installed position, is aligned vertically. The tube minor axis 225, in contrast, is aligned substantially horizontally.

[0063] Fig. Figure 3 shows a schematic representation of a tube cross-section 210 of the tube 205 according to an embodiment of the invention. The tube cross-section 210 has a tube major axis 220 and a tube minor axis 225, wherein the extension 220a of the tube major axis 220 is smaller than the extension 225a of the tube minor axis 225.

[0064] The dimensions of the tube 205 are the outer height h a , the inner height h i and the width b. The outer height h a corresponds to the extension 220a of the pipe main axis 220.

[0065] Fig. 4A shows a cooling device 200 with a cylindrically shaped coil 215 according to another exemplary embodiment of the invention.

[0066] Fig. 4B shows the cooling device 200 according to the Fig. 4A in a sectional view. The tube 205 is designed as a flat tube. The cooling device 200 can, in particular, be arranged in a closed liquid bath.

[0067] Fig. 4C shows the cooling device 200 according to the Fig. 4A in a horizontally illustrated installation position. The cooling device 200 is arranged in a closed liquid bath 105.

[0068] Fig. Figure 5A shows a schematic representation of a refrigeration circulator 100 according to another embodiment of the invention. The refrigeration circulator 100 has a tray 130. The tray 130 can be filled with liquid.

[0069] Fig. 5B shows the refrigeration circulator 100 according to the Fig. 5A in an alternative view. Three cooling devices 200 are arranged in the tub 130. The cooling devices 200 are arranged one above the other.

[0070] Fig. 5C shows the refrigeration circulator 100 according to the Fig. 5A in an alternative view. A sample can be placed in the tub 130 in the region of the helix axis 230.

[0071] Fig. 6A shows a separate cooling device 200 according to another exemplary embodiment of the invention. The refrigerant flows through the coil 215 to enable effective heat removal from the liquid bath 105 (not shown here). The cooling device 200 in this exemplary embodiment has the dimensions 20 cm x 25 cm. Furthermore, it has a height of approximately 40 cm.

[0072] Fig. 6B shows a plurality of cooling devices 200 according to the Fig. 6A in the installed position. The tray 130 has a rectangular shape. The tube 205 of the cooling device 200 runs essentially parallel to the walls of the tray 130. Such an arrangement of the cooling device 200 enables optimal space utilization while simultaneously achieving a homogeneous distribution of the cooling effect along the sample. Fig. 6C shows a plurality of cooling devices 200 according to the Fig. 6A illustrated embodiment in installed position and in an alternative view.

[0073] The starting point for the design of the cooling device 200 or an evaporator is the power to be transferred between the flowing refrigerant and the liquid in the liquid bath 105. The required heat-transfer surface area of ​​the cooling device can be determined depending on the heat transfer and the temperature difference between the refrigerant and the liquid in the liquid bath. The required length of the cooling device results from the geometry of the pipe cross-section.

[0074] The length and cross-section of the pipe determine its internal volume. The internal volume of the cooling device influences the amount of refrigerant that is contained in the cooling device during operation. Since the refrigerant can be in either liquid or gaseous form and the densities of the two phases differ greatly, the so-called degree of filling of the cooling device, which indicates the ratio of the volume of the liquid phase to the total volume of the cooling device, is also crucial. To accurately calculate the amount of refrigerant in the cooling device, both the proportion of the liquid phase and the densities of both phases present must be known spatially resolved over its length.

[0075] In addition to the internal volume, the pressure loss is another factor that must be taken into account when designing the cooling device. This is because the pressure loss influences the temperature difference between the refrigerant and the liquid in the bath via the evaporation temperature of the refrigerant and thus the heat output that can be transferred for a certain heat transfer surface. The reduction in the internal volume, as in the present invention by reducing the ratio of the extension of the pipe cross-section in the direction of the major pipe axis to the extension of the pipe cross-section in the direction of the minor pipe axis, is in turn accompanied by a higher pressure loss between the pipe inlet and outlet of the cooling device. When selecting the geometry of the cross-section, it is important to consider which pressure loss is still acceptable for the application of the cooling device.Nevertheless, with the flat tube geometry, a lower pressure loss can be achieved than with a round tube geometry with the same heat transfer surface.

[0076] Due to the complex relationships, both in terms of determining the amount of refrigerant in the cooling system and the pressure drop, simplifying assumptions, CFD simulations and / or experiments must be used when designing the cooling system. List of reference symbols 100 Refrigeration circulating thermostat 105 Liquid bath 110 Circulation thermostat 115 Pump 120 heating device 130 tub 135 Control device 140 displays 200 cooling device 205 pipe 210 pipe cross-section 215 Wendel 220 pipe main axis 220a Extension of the pipe main axis 225 Pipe minor axis 225a Extension of the pipe minor axis 230 Longitudinal axis of the helix 235 Pipe inlet 240 pipe outlet 245 spiral cross-section QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2005 021 610 A1

[0004]

Claims

[1] A refrigeration circulating thermostat (100), comprising a liquid bath (105) for tempering a sample, a cooling device (200) arranged in the liquid bath (105), and a circulating thermostat (110) with a pump (115) for circulating the liquid bath (105), wherein the cooling device (200) has a coolant-carrying tube (205) with a tube cross-section (210), wherein the tube (205) forms a coil (215) at least in sections, and the tube cross-section (210) has a main tube axis (220) and a secondary tube axis (225), wherein the extension (220a) of the tube cross-section (210) in the main tube axis (220) is smaller than the extension (225a) of the tube cross-section (210) in the secondary tube axis (225). [2] Refrigeration circulating thermostat (100) according to claim 1, wherein the coil (215) has a longitudinal axis (230) and the longitudinal axis (230) extends substantially vertically in the installed position of the cooling device (200). [3] Refrigeration circulating thermostat (100) according to one of the preceding claims, wherein the main tube axis (220) is oriented substantially parallel to the longitudinal axis (230) of the coil (215) and, in particular, vertically in the installed position. [4] Refrigeration circulating thermostat (100) according to one of the preceding claims, wherein the tube major axis (220) and tube minor axis (225) are aligned substantially orthogonally to one another. [5] Refrigeration circulating thermostat (100) according to one of the preceding claims, wherein the tube cross-section (210) is oval or rectangular with partial circle roundings. [6] Refrigeration circulating thermostat (100) according to one of the preceding claims, wherein the tube (205) has a tube length and a tube volume and the ratio of tube length to tube volume is at least 200 1 / dm 2 , in particular at least 300 1 / dm 2 amounts. [7] Refrigeration circulating thermostat (100) according to one of the preceding claims, wherein the ratio between the extension (220a) of the tube cross-section (210) in the direction of the tube main axis (220) and the extension (225a) of the tube cross-section (210) in the direction of the tube minor axis (225) is less than 1:2, in particular less than 1:3 or less than 1:

4. [8] Refrigeration circulating thermostat (100) according to one of the preceding claims, wherein the coil (215) has a substantially rectangular or round coil cross-section (245). [9] Refrigeration circulating thermostat (100) according to one of the preceding claims, wherein the tube (205) comprises a tube inlet (235) and a tube outlet (240), wherein the tube inlet (235) is located below the tube outlet (240) in the installed position of the cooling device (200). [10] Refrigeration circulating thermostat (100) according to one of the preceding claims, wherein the liquid bath (105) has a connection by means of which the liquid bath (105) can be connected to an external liquid bath or an external device. [11] Refrigeration circulation thermostat (100) according to one of the preceding claims, wherein the circulation thermostat (110) protrudes at least partially from above into the liquid bath (105). [12] Refrigeration circulating thermostat (100) according to one of the preceding claims, wherein the circulating thermostat (110) comprises a heating device (120) for heating the liquid bath (105). [13] Refrigeration circulating thermostat (100) according to one of the preceding claims, wherein the pump and / or the heating device (120) of the circulating thermostat (110) are arranged in the liquid bath (105). [14] Refrigeration circulating thermostat (100) according to one of the preceding claims, wherein the liquid bath (105) comprises a substantially rectangular or round tub (130) and the tube (205) of the cooling device (200) runs substantially parallel to the walls of the tub (130). [15] Refrigeration circulating thermostat (100) according to one of the preceding claims, wherein the circulating thermostat (110) comprises a control device (135) and a display (140). [16] Refrigeration circulating thermostat (100) according to one of the preceding claims, wherein the refrigeration circulating thermostat (100) comprises a plurality of cooling devices (200) arranged one above the other.

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