DE102008019387A1 - Refrigeration appliance, in particular domestic refrigeration appliance comprising a condenser with heat storage elements - Google Patents

Abstract

The invention relates to a refrigeration appliance, in particular household refrigerating appliance (1), comprising a housing (2) with an interior (3) accommodating refrigerated goods (4), a compressor (5), a condenser (8) and an evaporator (6). in which the compressor (5), the condenser (8) and the evaporator (6) are fluid-conductively connected to a cooling circuit (7), and wherein the condenser (8) comprises cooling structures (9) surrounded by ambient air, wherein heat storage elements are provided for increasing the ratio of the heat capacity of the condenser (8) to its internal volume and / or wherein the ratio of the heat capacity of the condenser to its internal volume is at least 20 J / Kcm3. The invention is characterized by easy manufacturability, improved efficiency and lower operating costs.

Description

The The invention relates to a refrigeration device, in particular Household refrigerating appliance comprising a housing with an interior therein for receiving refrigerated goods, a Compressor, a condenser and an evaporator, wherein the compressor, the condenser and the evaporator are connected fluid-conducting to a cooling circuit, and wherein the liquefier Cooling structures flowed around by the ambient air having.

Farther The invention relates to a process for economical operation a refrigeration device, in particular Household refrigerator.

One fridge is an electrical or gas powered device that has a refrigerated interior for storing refrigerated goods provides. The temperatures in the interior are usually above 0 ° C, for example between + 2 ° C and + 12 ° C. One Freezer is a suitable device for storing frozen food and has an interior space with temperatures below 0 ° C, for example between -25 ° C and -4 ° C, on. Cold and Freezer combinations have at least two interiors or two separate areas for the different temperature ranges.

such Cooling and / or freezers have a cooling circuit for cooling of the respective interior. The cooling circuit takes those in the interior heat over a thus thermally coupled heat exchanger on and gives them by means of a second heat exchanger to the environment from. A cooling circuit may include a variety of components, such as a condenser, an evaporator, valves, flow resistors and Coolant lines.

Remove refrigeration equipment a room, usually the interior of the refrigerator, with a lower temperature level Warmth, to attach them to a room with a higher temperature level, in usually the space surrounding the refrigerator or the environment, to give.

This heat transport takes place with the help of a cycle, which usually the special energy intensity an evaporation or the Verduns processing process exploits. Of the condenser has in this cycle the task of compressed hot gaseous refrigerant cool and liquefy it. The heat dissipation in the liquefying due to the temperature difference between the warm refrigerant and the colder one Surroundings.

Depending on the to be discharged Amount of heat energy and the efficiency of heat transfer from refrigerant to the environment is the size of the condenser to choose. The energy consumption of a refrigeration device is in With regard to the economy and environmental friendliness of the Operation significant.

Around to improve the efficiency of the refrigerator and to reduce the energy demand, it is appropriate that Operating temperature of the condenser preferably low. This can, for example, by cooling the Condenser, to Example by means of a fan can be achieved. Usually must for a better cooling of the liquefier also be spent energy, which is at least a part of saved by the cooling Balancing energy again. For example, fans need electricity or larger liquefiers are more expensive in the production.

Commercial liquefaction of Refrigerators do that warm refrigerants in pipe loops along the ambient air along and lead so the heat from the refrigerant through the pipe wall to the environment.

The heat dissipation can support be by the for the heat output relevant surface using lamellae or wires is enlarged. These Slats or wires be for this to the the warm coolant leading Pipes attached.

Out establish The cost-effectiveness has been the condenser usually with the thinnest possible tubes designed to save material costs. The heat storage capacity of the condenser as such played for the heat transfer and the efficiency of the cooling circuit so far no significant role.

In contrast, is It is an object of the present invention to provide a refrigerator and / or freezer, which is easy to produce, has a high efficiency and low operating costs.

Farther It is the object of a method for operating a cooling and / or freezer to specify which is particularly energy-efficient and economical.

These Tasks are solved through the cooling and / or freezer and by the method of operating a refrigerator and / or freezer, such as in the independent ones claims specified.

Further advantageous embodiments and developments, which each applied individually or in any suitable manner with each other can be combined are the subject of each dependent claims or will be explained in more detail in the following description.

The Cooling and / or inventive cooling freezer includes a housing with an interior therein for receiving refrigerated goods, a Compressor, a liquefier and an evaporator, wherein the compressor, the condenser and the Evaporator fluidly connected to a cooling circuit and wherein the liquefier flowed around by the ambient air cooling structures having heat storage elements are provided to enlarge the ratio the heat absorption capacity the liquefier, which is defined as the product of heat storage capacity of the condenser and weight of the condenser, to the internal volume of the condenser.

The Heat capacity describes the amount of energy that the condenser per Temperature increase absorbs. The heat absorption capacity does not include the assets of the coolant to absorb heat. The internal volume of the condenser is through the interior of the fluid lines inside the condenser where.

With Help the heat storage elements is the heat absorption capacity, which is given in units of Joules per Kelvin, for example can be increased. By the heat storage elements thus becomes the ratio the heat absorption capacity of the liquefier enlarged to its internal volume. hereby can the liquefier Heat off the cooling circuit to a considerable extent Caching. By its heat storage capacity can the liquefier especially even then heat dissipate to the environment, if the compressor is not in operation, or regardless of the discharged to the environment Amount of heat heat the coolant Remove if the compressor has been running for a long time.

By a high heat capacity of the heat storage elements is a high energy input in the storage medium without high temperature increase and a reduction of the heat stored during the life of the compressor allows. In the consequence can also the compressor service lives, d. H. the times during which The compressor is not in operation, used to heat to the Environment. A lower condensing temperature increases the thermal Efficiency in the refrigeration cycle.

By the heat storage elements becomes the refrigerant in the cooling circuit effectively cooled, so that the pressure and the temperature in the condenser on a lower level. Laboratory tests have shown that the Energy intake of the cooling and / or freezer Up to 6% decreases when heat storage elements at the liquefier be attached.

The cooling structures can in particular by cooling fins or cooling wires formed which are at the condenser are attached and with this in heat conductive contact.

The Heat storage elements can as built-in or add-on elements for the liquefier be designed. You can into the liquefier pushed in or clamped to this.

The Heat storage elements can as a bag or packet with a heat storing fluid, in particular water, be configured. water has a comparatively high heat capacity and is inexpensive.

The Heat storage elements can also later in the cooling and / or freezer to be built in.

In a special embodiment of the bag or the packet is made a metal composite foil, in particular of an aluminum composite foil, or formed from a plastic film. Inside the bag is the heat storing fluid.

In In a further embodiment, the heat storage elements are rigid container with a heat storing substance, in particular water or paraffin, designed.

It can be advantageous if the heat-storing substance in the Temperature range of normal operation of the refrigerator and / or freezer one Phase transition to that in the phase transition exploiting latent heat of transformation. For example, in paraffin, the phase transition solid-liquid exploited be to the cooling circuit effective and in big Extracting energy and storing this energy.

The Heat storage elements can in a further embodiment also be designed as solid metal plates or metal rods.

In In a particularly advantageous embodiment, the heat storage elements exchangeable or retrofittable. Such heat storage elements are economical can be produced and later easily installed or replaced. They also end consumers for retrofitting offered by known refrigerators and / or freezers become.

In a further embodiment, the heat storage elements can be inserted between the cooling structures. For example, the heat storage elements are inserted into the loops or windings formed by the cooling wires postponed.

It is possible, too, the heat storage elements on the cooling fins to attach or insert them between cooling fins.

In a further embodiment of the invention, the refrigerator and / or freezer comprises a housing having an interior therein for receiving refrigerated goods, a compressor, a condenser and an evaporator, wherein the compressor, the condenser and the evaporator are fluidly connected to a cooling circuit and wherein the condenser has cooling structures surrounded by ambient air, wherein the ratio of the heat capacity of the condenser, which is defined as the product of the heat storage capacity of the condenser and the weight of the condenser to the internal volume of the condenser, is at least 20 J / Kcm ³ .

Conventional plasticizers have a heat absorption capacity of about 10 J / Kcm ³ .

With Help of heat storage elements, which are configured as a water bag, for example, the relationship the heat absorption capacity of the condenser to the internal volume of the condenser easily tripled or quintupled.

at alternative embodiments with thicker cooling wires or thicker tube wall thicknesses of the coolant lines in the liquefier can the relationship be doubled.

advantageously, will the ratio the heat absorption capacity of the liquefier to the internal volume of the condenser through the heat storage elements increased. Especially will the ratio at least doubled, in particular at least quadrupled, for example at least eightfold.

The ratio is thus at least 20 J / Kcm ³ , in particular at least 40 J / Kcm ³ , for example at least 80 J / Kcm ³ .

The inventive method for operating a cooling and / or freezer comprising a cooling circuit with a condenser, especially the cooling and / or freezer according to one of the preceding claims, provides that at the condenser Heat storage elements be provided to enlarge the ratio the heat absorption capacity the liquefier, which is defined as the product of heat storage capacity of the condenser and weight of the condenser, to the internal volume of the condenser.

In one embodiment, the ratio is at least 20 J / Kcm ³ , in particular at least 40 J / Kcm ³ , for example at least 80 J / Kcm ³ .

Further advantageous details and aspects, each applied individually or can be suitably combined with each other in a suitable manner with reference to the following drawing, which illustrates the invention by way of example only to illustrate, closer explained.

The Heat storage elements can especially retrofitted become.

It show schematically:

1 a cooling and / or freezing device according to the invention in a sectional view from the side;

2 a detail view of a conventional evaporator for a refrigerator and / or freezer;

3 a heat storage element for the cabbage and / or freezer after 1 ; and

4 a detailed view of a condenser for another embodiment of a refrigerator and / or freezer with an inserted heat storage element.

1 shows a refrigerator and / or freezer according to the invention 1 , in particular a domestic refrigerator in a sectional view from the side with a housing and an inner container 12 , The inner container 12 has an interior 3 for refrigerated storage of refrigerated goods 4 on. The interior 3 can through a door 2 opened and closed. The inner container 12 is in the case 2 foamed with a foaming 13 for better thermal insulation of the interior 3 ,

The refrigerator and / or freezer 1 has a cooling circuit 7 on. The cooling circuit 7 includes a compressor 5 for compression of one in the cooling circuit 7 circulating coolant, a condenser 8th for liquefying the compressed refrigerant while releasing heat to the ambient air 17 , and a throttle 11 and an evaporator 6 for relaxing the compressed and cooled and thus liquefied refrigerant in the evaporator 6 with release of cold to the interior 3 , The compressor 5 , the liquefier 8th , the throttle 11 and the evaporator 6 are through coolant lines 18 fluidly connected and form the cooling circuit 7 ,

The condenser 8th has cooling structures 9 in the form of cooling wires or cooling fins to the relevant for the heat dissipation area for the Umge ambient air 17 to enlarge. The cooling structures 9 are from the ambient air 17 flows around and thus allow an efficient heat transfer.

The condenser 8th has a condenser inlet 15 and a condenser outlet 16 on. Through the condenser inlet 15 and the condenser outlet 16 is an internal volume of the condenser 8th defined for the coolant therein.

In the liquefier 8th is a heat storage element 10 inserted. The heat storage element 10 is formed by a bag of an aluminum composite foil having a heat-storing substance therein, such as water or paraffin.

By the heat storage element, the ratio of the heat capacity of the condenser 8th , which is defined as the product of heat storage capacity of the condenser 8th and weight of the condenser 8th , to the internal volume of the condenser 8th enlarged and is 35 J / Kcm ³ . As a result, the temperature in the condenser is kept comparatively low and the thermal efficiency in the refrigeration cycle is improved. In particular, with the aid of the heat storage elements, heat can be released even when the compressor is not in operation. Due to the delayed due to the ratio of heat release of the temperature gradient in the condenser between the coolant and the walls of the condenser is increased, thereby lowering the temperature of the coolant in the condenser.

The heat storage elements 10 are inexpensive to produce, but reduce the energy consumption of the refrigerator and / or freezer 1 considerably. In laboratory test was a reduction in energy consumption of the refrigerator and / or freezer 1 measured by 6%.

2 , shows a section of a known condenser 5 with cooling structures 9 and a cooling message 18 , The cooling structures 9 are designed as cooling wires, which are the coolant line of the condenser 9 span.

3 shows a heat storage element 10 for the refrigerator and / or freezer 1 to 1 , The heat storage element 10 is designed as a bag with paraffin. The bag is sealed and closed. Due to the heat of the coolant, the paraffin is liquefied, so that a significant amount of heat can be stored as latent heat in the phase transition solid-liquid of the paraffin.

4 shows a sectional view of an evaporator of another embodiment of a refrigerator and / or freezer 1 , wherein the heat storage element 10 partly in the liquefier 5 is inserted. The heat storage element 2 is between the cool messages 18 of the liquefier 9 between the cooling structures designed as carbon wires 9 inserted in the horizontal direction. With the help of the heat storage elements 10 can reduce the energy consumption of the refrigerator and / or freezer 1 be lowered to a considerable extent, for example by 6%.

The invention relates to a cabbage and / or freezer 1 comprising a housing 2 with an interior inside 3 for receiving refrigerated goods 4 , a compressor 5 , a liquefier 8th and an evaporator 6 , where the compres sor 5 , the liquefier 8th and the evaporator 6 fluid-conducting to a cooling circuit 7 are connected, and wherein the liquefier 8th Cooling structures flowed around by the ambient air 9 wherein heat storage elements are provided to increase the ratio of the heat capacity of the condenser 8th , to its internal volume and / or wherein the ratio of the heat capacity of the VEflüssigers to its internal volume is at least 20 J / Kcm ³ . The invention is characterized by easy manufacturability, improved efficiency and lower operating costs.

1

Cooling and / or freezer

2

casing

3

inner space

4

refrigerated

5

compressor

6

Evaporator

7

Cooling circuit

8th

condenser

9

cooling structures

10

Heat storage element

11

throttle

12

inner container

13

foaming

14

door

15

condenser inlet

16

condenser outlet

17

ambient air

18

Coolant lines

Claims (13)

Refrigerating appliance, in particular household refrigerating appliance ( 1 ) comprising a housing ( 2 ) with an interior ( 3 ) for receiving refrigerated goods ( 4 ), a compressor ( 5 ), a liquefier ( 8th ) and an evaporator ( 6 ) where the compressor ( 5 ), the liquefier ( 8th ) and the evaporator ( 6 ) fluid-conducting to a cooling circuit ( 7 ), and wherein the liquefier ( 8th ) cooling structures flowed around by the bypass air ( 9 ), characterized in that heat storage elements ( 10 ) are provided to increase the ratio of the heat capacity of the condenser ( 8th ), which is defined as the product of heat storage capacity of the condenser ( 8th ) and weight of the liquefier ( 8th ), to the internal volume of the condenser ( 8th ). Refrigerating appliance, in particular household refrigerating appliance ( 1 ) according to claim 1, wherein the heat storage elements ( 10 ) as built-in or add-on elements for the condenser ( 8th ) are designed. Refrigerating appliance, in particular household refrigerating appliance ( 1 ) according to one of the preceding claims, wherein the heat storage elements ( 10 ) as a bag or packet with a heat-storing fluid, in particular water, are configured. Refrigerating appliance, in particular household refrigerating appliance ( 1 ) according to claim 3, wherein the bag or the packet is formed of a metal composite foil, in particular an aluminum composite foil, or of a plastic film. Refrigerating appliance, in particular household refrigerating appliance ( 1 ) according to one of the preceding claims, wherein the heat storage elements ( 10 ) are designed as a rigid container with a heat-storing substance, in particular water or paraffin. Refrigerating appliance, in particular household refrigerating appliance ( 1 ) according to claim 5, wherein the heat-storing substance has a phase transition in the operating temperature range of the liquefier ( 8th ) having. Refrigerating appliance, in particular household refrigerating appliance ( 1 ) according to one of the preceding claims, wherein the heat storage elements ( 10 ) are formed as solid metal plates or metal rods. Refrigerating appliance, in particular household refrigerating appliance ( 1 ) according to one of the preceding claims, wherein the heat storage elements ( 10 ) are interchangeable or retrofittable. Refrigerating appliance, in particular household refrigerating appliance ( 1 ) according to one of the preceding claims, wherein the heat storage elements ( 10 ) between the cooling structures ( 9 ) are inserted. Refrigerating appliance, in particular household refrigerating appliance ( 1 ) comprising a housing ( 2 ) with an interior ( 3 ) for receiving refrigerated goods ( 4 ), a compressor ( 5 ), a liquefier ( 8th ) and an evaporator ( 6 ), where the compressor ( 5 ), the liquefier ( 8th ) and the evaporator ( 6 ) fluid-conducting to a cooling circuit ( 7 ), and wherein the liquefier ( 8th ) cooling structures flowed around by the bypass air ( 9 ), characterized in that the ratio of the heat absorption capacity of the condenser ( 8th ), which is defined as the product of heat storage capacity of the condenser ( 8th ) and weight of the liquefier ( 8th ), to the internal volume of the condenser ( 8th ), at least 20 J / Kcm ³ . Refrigerating appliance, in particular household refrigerating appliance ( 1 ) according to claim 10 in combination with one of claims 1 to 9. Method for operating a refrigerating appliance, in particular household refrigerating appliance ( 1 ) comprising a cooling circuit ( 7 ) with a condenser ( 8th ), in particular the refrigerator and / or freezer according to one of the preceding claims, characterized in that at the condenser ( 8th ) Heat storage elements ( 10 ) are provided to increase the ratio of the heat capacity of the condenser ( 8th ), which is defined as the product of heat storage capacity of the condenser ( 8th ) and weight of the liquefier ( 8th ), to the internal volume of the condenser ( 8th ). A method according to claim 13, wherein the ratio is at least 20 J / Kcm ³ , in particular at least 40 J / Kcm ³ , for example at least 80 J / Kcm ³ .