EP2906882B1 - Refrigerator with two evaporators - Google Patents

Description

The invention relates to a refrigeration device with a refrigerant circuit having a compressor and at least a first evaporator and a second evaporator, wherein the refrigerant circuit has a main branch and at least a first parallel branch and a second parallel branch, wherein the compressor in the main branch, the first evaporator in the first Parallel branch and the second evaporator in the second parallel branch are arranged, and wherein between a discharge of the compressor and an inlet of the first evaporator and an inlet of the second evaporator, a diverter valve having an input and at least a first output and a second output is arranged, wherein the input with the refrigerant circuit, the first output with the first parallel branch and the second output with the second parallel branch is connected refrigerant leading.

Refrigeration appliances, in particular designed as household appliances refrigerators are known and are used to housekeeping in households or in the catering sector to store perishable food and / or drinks at certain temperatures.

From the DE 10 2006 015 989 A1 a refrigeration device with a refrigerant circuit is known, which has two evaporators in addition to a compressor, both of which are arranged in the refrigerant circuit parallel to each other. The refrigerant circuit further comprises a 3/2-way valve which is connected to an outlet of the compressor and each having an inlet of the two evaporators. Each of the two evaporators is assigned a refrigeration compartment. For refrigerators with more than one evaporator, the distribution of the refrigerant in the refrigeration cycle plays a major role in optimally filling the two evaporators. The evaporators must each be operated with an optimum filling level in order to achieve a high evaporation temperature. At the same time, an overflow of liquid refrigerant is to be avoided, since the incoming intake pipe cooling system therefore causes a loss of cooling capacity. In such parallel-connected evaporators, such as in a twin-Nofrost system, to ensure that during operation of the warmer cold compartment of the two refrigerators fan evaporated refrigerant does not condensate in the colder evaporator. This sees the DE 10 2006 015 989 A1 in the case of a refrigerant requirement in a first refrigeration compartment in a preparatory step, first to pressurize the evaporator of the second refrigeration compartment with refrigerant. Subsequently, the refrigerant circuit is closed to the evaporator of the second refrigeration compartment and only the evaporator of the first Refrigeration compartment charged with refrigerant. An alternative solution to this is a check valve which is arranged between the compressor and one of the two evaporators. Thus, by evacuating refrigerant from the colder of the two evaporators, the evaporator associated with the warmer refrigeration compartment can be operated with an improved degree of filling. However, the suction requires energy and thus increases the energy consumption of the refrigerator.

The publication DE 34 31 452 A1 shows a used as a heat pump refrigerator or freezer. The disclosure document DE 3 431 452 A1 discloses a refrigerator according to the preamble of claim 1.

The publication EP 1 707 900 A1 shows a refrigeration device comprising a refrigerant circuit.

It is therefore the object underlying the invention to provide a refrigeration device with reduced energy requirements.

This object is achieved by the subject matter having the features of the independent claim. Advantageous developments are the subject of the dependent claims, the description and the drawings.

The present invention is based on the finding that, by completely separating one of the two evaporators, the respectively non-separated evaporator can be operated with an optimum filling level.

According to a first aspect, the object according to the invention is achieved by a refrigeration device in which a second diverter valve with at least one first input, one second input and one output is arranged between a compressor inlet of the compressor and an evaporator outlet of the first evaporator and an evaporator outlet of the second evaporator, wherein the first input to the first parallel branch, the second input to the second parallel branch and the output to the refrigerant circuit is refrigerant leading. As a result, the technical advantage is achieved that in each case one of the two evaporators can be operated with an optimal degree of filling. Thus, no extraction of refrigerant from the other evaporator is required. Therefore, no energy must be expended for the extraction of refrigerants, so that the energy consumption of the refrigeration device is reduced. With the The first diverter valve, refrigerant can be selectively directed into the first or second parallel branch, and with the second diverter valve, either the first or second parallel branch can be connected to the refrigerant circuit. Both the first diverter valve and the second diverter valve may be 3/2-way valves. 3/2-way valves have two valve seats, whereby alternately always one of the two valve seats remains open or closed. Thus, in the case of the first diverter valve in a first switching position of the first diverter valve, the first output is opened and the second output is closed, or in a second switching position of the first diverter valve, the first output is closed and the second output is opened. In the case of the second diverter valve, the first input is opened and the second input is closed in a first switching position of the second diverter valve, or in a second switching position of the second diverter valve, the first input is closed and the second input is opened.

In an advantageous embodiment, a first throttle is arranged between the first diverter valve and the evaporator inlet of the first evaporator, and a second throttle is arranged between the second diverter valve and the evaporator inlet of the second evaporator. As a result, the technical advantage is achieved that each evaporator is preceded by a throttle adapted to the evaporator. This makes energy-efficient operation of the two evaporators possible.

In an advantageous embodiment, in the refrigerant circuit between the compressor and the first evaporator and the second evaporator, an intake manifold throttle tube heat exchanger is arranged, which is heat-transmitting connected to the first throttle and / or with the second throttle. As a result, the technical advantage is achieved that the residual cold of the effluent from the evaporator refrigerant is used, since the refrigerant in the first throttle and / or the second throttle heat is withdrawn.

In one embodiment of the invention, the first diverter valve has a first switching position, in which the first outlet of the first diverter valve for refrigerant is permeably connected to the evaporator inlet of the first evaporator, and the second outlet of the first diverter valve is impermeable to refrigerant. Thereby, the technical advantage is achieved that a flexible operation of the refrigerator with an adaptation to different boundary conditions, such as. different ambient temperatures, is possible.

In one embodiment of the invention, the first diverter valve has a second switching position, in which the second outlet of the first diverter valve is permeably connected to the evaporator inlet of the second evaporator, and the first outlet of the first diverter valve is impermeable to refrigerant. As a result, the technical advantage is achieved that a flexible operation of the refrigerator with an adaptation to various boundary conditions, such as different ambient temperatures, is possible.

In one embodiment of the invention, the second diverter valve has a first switching position, in which the first input of the second diverter valve for refrigerant is permeably connected to the evaporator outlet of the first evaporator, and the second input of the second diverter valve is blocked impermeable to refrigerant. Thereby, the technical advantage is achieved that a flexible operation of the refrigerator with an adaptation to different boundary conditions, such as. different ambient temperatures, is possible.

In one embodiment of the invention, the second diverter valve has a second switching position, in which the second input of the second diverter valve is connected in a permeable manner to the evaporator outlet of the second evaporator, and the first input of the second diverter valve is impermeable to the refrigerant. Thereby, the technical advantage is achieved that a flexible operation of the refrigerator with an adaptation to different boundary conditions, such as. different ambient temperatures, is possible by a refrigerant transfer from a refrigeration compartment in the other.

In one embodiment of the invention, the refrigeration device is operated in a normal mode in which at least temporarily the first diverter valve in the first switching position and the second diverter valve are simultaneously in the first switching position. As a result, the technical advantage is achieved that the first evaporator looped into the refrigerant circuit and the second evaporator can be completely separated from the refrigeration cycle. Thus, an unwanted shift of refrigerant from the second evaporator is excluded in the first evaporator. Therefore, an operation with optimal filling degree is possible.

In a erfindungegemäßen embodiment, the refrigeration device is operated in a further normal operation in which at least temporarily, the first diverter valve in the second switching position and the second diverter valve are simultaneously in the second switching position. As a result, the technical advantage is achieved that the second evaporator looped into the refrigerant circuit and the first evaporator can be completely separated from the refrigeration cycle. Thus, an operation of both evaporators, each with optimal filling level is possible.

In an advantageous embodiment, the refrigeration device is operable in a transfer mode in which at least temporarily the first diverter valve in the first switching position and the second diverter valve in the second switching position are simultaneously. As a result, the technical advantage is achieved that refrigerant can be displaced from a first evaporator in the second evaporator. Thus, the degree of filling can be adjusted by operation in transmission mode.

In an advantageous embodiment, the refrigeration device is operable in a transfer mode, in which at least temporarily the first diverter valve in the second switching position and the second diverter valve in the first switching position are simultaneously. As a result, the technical advantage is achieved that refrigerant can be displaced from the second evaporator in the first evaporator. Thus, the degree of filling of both evaporators can be adjusted by operation in transmission mode.

In an advantageous embodiment, the refrigerant circuit has a condenser, wherein a stop valve is provided between the condenser and the first diverter valve. As a result, the technical advantage is achieved that an unwanted refrigerant shift from the condenser to the evaporator during downtime of the compressor can be prevented.

In an advantageous embodiment, in a transfer mode with a driven compressor, a stop valve at least temporarily prevents a refrigerant flow in the refrigerant circuit. As a result, the technical advantage is achieved that can be sucked by the suction of the compressor refrigerant from the first evaporator and / or the second evaporator.

In one embodiment of the invention, the refrigeration device has a control which is connected at least to the first diverter valve and the second diverter valve for driving the first diverter valve and the second diverter valve. As a result, the technical advantage is achieved that by a selective control of a flexible operation of the refrigerator with an adaptation to various boundary conditions, such as. different ambient temperatures, is possible.

In an advantageous embodiment, the control is at least connected to a temperature sensor for transmitting measuring signals. This achieves the technical advantage that the controller, for example, when exceeding a predetermined threshold for the detected temperature of the normal operation in the transfer mode changes and thus automatically makes an adjustment of the degree of filling, so that even at extreme temperatures, such as in the tropics operation with an optimal degree of filling is possible.

• Fig. 1 eine Vorderansicht eines Kältegeräts, und
• Fig. 2 eine schematische Darstellung eines Kältemittelkreislaufes des Kältegeräts der Fig. 1.

Further embodiments will be explained with reference to the accompanying drawings. Show it:

• Fig. 1 a front view of a refrigerator, and
• Fig. 2 a schematic representation of a refrigerant circuit of the refrigeration device of Fig. 1 ,

Fig. 1 shows a refrigerator as an exemplary embodiment of a refrigeration device 100. The refrigeration device 100 is formed in the present embodiment as a refrigerator-freezer combination and also has in the present embodiment, a twin-Nofrost system.

In the present exemplary embodiment, the refrigeration appliance 100 has a first, upper refrigeration compartment 102, which is designed as a freezer compartment in the present exemplary embodiment. In addition, the refrigeration device 100 in the present embodiment, a second, lower cooling compartment 104, which is formed in the present embodiment as a cooling compartment.

Fig. 2 1 shows an exemplary embodiment of a refrigerant circuit 200 of such a refrigeration device 100.

The refrigerant circuit 200 includes a compressor 202, a condenser 204, a stop valve 206, a first diverter valve 208, a first throttle 210, a second throttle 212, a first evaporator 214, a second evaporator 216, a second diverter valve 218, and a draft tube throttle tube Heat exchanger 220 on.

The compressor 202 is in the present embodiment, a mechanically driven component, the refrigerant vapor from one of the two evaporators 214, 216 sucks and promotes against a higher pressure to the condenser 204.

The condenser 204 is formed as a heat exchanger in which, after compression, the vaporized refrigerant is released by heat release to an external cooling medium, i. the ambient air is liquefied.

The first evaporator 214 and the second evaporator 216 are formed in the present embodiment as a heat exchanger in which, after expansion, the liquid refrigerant by heat absorption from the medium to be cooled, i. Air inside the refrigerator, is evaporated. Further, in the present embodiment, the first evaporator 214 and / or the second evaporator 216 are formed as a static evaporator. Thus, no fans are required for forced energization of the first evaporator 214 and / or the second evaporator 216.

In the present exemplary embodiment, the first evaporator 214 is assigned to the first refrigeration compartment 102 and the second evaporator 216 to the second refrigeration compartment 104. In the present embodiment, both the first evaporator 214 and the second evaporator 216 are formed as a fin evaporator.

The first evaporator 214 is the first throttle 210 and the second evaporator 216 is the second throttle 212 associated. The throttles 210, 212 are devices for reducing the pressure by necking.

The first throttle 210 and the first evaporator 214 are connected in series, and the second throttle 212 and the second evaporator 216 are connected in series, wherein these two series circuits are connected in parallel in the present embodiment. That the refrigeration cycle 200 is divided into two parallel branches 274, 276, wherein in the present embodiment, the compressor 202, the condenser 204, the stop valve 206 and the intake manifold throttle tube heat exchanger 220 are arranged in a main branch 278 of the refrigeration cycle 200.

The refrigerant is a fluid used for heat transfer in the cryogenic system that absorbs heat at low temperatures and low pressure of the fluid and releases heat at higher temperature and pressure of the fluid, usually including changes in state of the fluid.

In addition, the refrigerant circuit 200 in the present embodiment includes the stop valve 206, which is a controllable solenoid valve in the present embodiment, with a refrigerant flow in the refrigerant circuit 200 can be interrupted.

Furthermore, in the present exemplary embodiment, the refrigerant circuit 200 comprises the intake manifold throttle tube heat exchanger 220, so that the residual refrigeration of the refrigerant flowing out of the evaporator is also utilized.

In the present exemplary embodiment, the first diverter valve 208 has an input 222 and a first output 224 and a second output 226. The second diverter valve 218 has a first input 228 and a second input 230 and an output 232. With the first diverter valve 208, refrigerant can be selectively directed into the first parallel branch 274 or into the second parallel branch 276, and with the second diverter valve 218, either the first parallel branch 274 or the second parallel branch 276 can be connected to the compressor 202.

In the present embodiment, both the first diverter valve 208 and the second diverter valve 218 are designed as a 3/2-way valve. 3/2-way valves have two valve seats, whereby alternately always one of the two valve seats remains open or closed. Thus, in the case in a first switching position of the first diverter valve 208, the first output 224 is open and the second output 226 is closed, or in a second switching position of the first diverter valve 208, the first output 224 is closed and the second output 226 is opened. In the case of the second diverter valve 218, in a first switching position of the second diverter valve 218, the first input 228 is opened and the second input 230 is closed, or in a second switching position of the second diverter valve 218, the first input 228 is closed and the second input 230 is opened.

The compressor 202 has a compressor outlet 234, which is connected to a condenser inlet 236 of the condenser 204 refrigerant leading.

A condenser exit 238 of the condenser 204 is connected to an input port 240 of the stop valve 206 refrigerant leading.

An output port 242 of the stop valve 206 is connected to the inlet 222 of the first diverter valve 208 refrigerant leading.

The first output 224 of the first diverter valve 208 is connected to a throttle input 244 of the first throttle 210.

A throttle output 246 of the first throttle 210 is connected to an evaporator inlet 248 of the first evaporator 214 refrigerant leading.

An evaporator outlet 250 of the first evaporator 214 is connected to the first input 230 of the second diverter valve 218 refrigerant leading.

The second output 226 of the first diverter valve 208 is connected to a throttle inlet 252 of the second throttle 212 refrigerant leading.

A throttle output 254 of the second throttle 212 is connected to an evaporator input 256 of the second evaporator 216 refrigerant leading.

An evaporator outlet 258 of the second evaporator 214 is connected to the second input 228 of the second diverter valve 218 refrigerant leading.

The output 232 of the second diverter valve 218 is connected to a heat exchanger inlet 260 of the intake manifold throttle tube heat exchanger 220 refrigerant leading.

A heat exchanger outlet 262 of the intake manifold-to-choke heat exchanger 220 is connected via a suction pipe 266 to a compressor inlet 264 of the compressor 202 refrigerant leading.

The first diverter valve 208 and the second diverter valve 218 are connected to a controller 268 via control lines 270 to transmit control signals. Furthermore, the stop valve 206 is connected via a control lines 280 and the compressor 202 via a control lines 282 control signal transmitting with a controller 268 connected.

In normal operation, the controller 268 controls the first diverter valve 208 and the second diverter valve 218 to the first switching position. At the same time, the controller 268 controls the second one Diverter valve 218 in the first switching position. Thus, in the first phase of the normal operating cycle, refrigerant flows through the first throttle 210 and the first evaporator 214 and thus cools the refrigeration compartment 102 associated with the first evaporator 214. On the other hand, in the first phase of the normal operating cycle, the second throttle 212 and the second evaporator 216 are from the refrigerant circuit 200 separated.

In a second phase of the normal operating cycle, the controller 268 controls the first diverter valve 208 to the second switching position. At the same time, the controller 268 controls the second diverter valve 218 in the second switching position. Thus, in the second phase of the normal operating cycle, refrigerant flows through the second orifice 212 and the second evaporator 216 and thus cools the refrigeration compartment 104 associated with the second evaporator 216. On the other hand, in the second phase of the normal operation cycle, the first orifice 210 and the first evaporator 214 are from the refrigerant cycle 200 separated.

Notwithstanding that in the present embodiment, the normal operation cycle may begin with the second phase described above followed by the first phase.

By mutually disconnecting a respective one of throttles 210, 212 and an evaporator 214, 216, both the first evaporator 214 and the second evaporator 216 may each be operated with an optimum charge amount of refrigerant, i. with an optimal filling level. Therefore, no refrigerant has to be sucked out of the respective other evaporator 214, 216, so that no energy has to be expended for this purpose. Thus, the power consumption of the refrigeration device 100 is reduced.

Further, in the present embodiment, the controller 268 may operate the first diverter valve 208 and the second diverter valve 218 in a transmission mode.

In the transfer operation, for example, refrigerant is drawn off from the second evaporator 216 in order to have sufficient refrigerant available for the operation of the first evaporator 214. For this purpose, the controller 268 controls the first diverter valve 208 in its first switching position. Further, the controller 268 controls the second diverter valve 218 to its second switching position. Now refrigerant is sucked from the second evaporator 216 and then changed to normal operation.

Furthermore, in the present exemplary embodiment, it is also possible to draw in refrigerant from the first evaporator 214. For this purpose, the controller 268 controls the first diverter valve 208 in its second switching position. Further, the controller 268 controls the second diverter valve 218 in its first switching position. Now refrigerant is sucked from the first evaporator 214 and then changed to normal operation.

Due to different filling levels of the condenser 204 during operation of the first evaporator 214 and the second evaporator 216 results in each change from the first phase to the second phase of normal operation, a change in the effective refrigerant charge. By changing from the normal mode to the transmission mode, e.g. Within predetermined intervals, it is achieved that a shift of refrigerant in normal operation, caused by different operating temperatures of the first evaporator 214 and the second evaporator 216, can be reversed, so that operation of the first evaporator 214 and the second evaporator 216 with the optimal filling level is guaranteed. Alternatively or additionally, in the transfer mode with operated compressor 202, the stop valve 206 can be brought into its blocking state, so that an unwanted refrigerant flow in the refrigerant circuit 200 is prevented. Due to the suction effect of the compressor 202, it is then possible to extract refrigerant from the first evaporator 214 and / or the second evaporator 216.

Further, in the present embodiment, the controller 268 is connected to a temperature sensor 272. When the temperature value detected by the temperature sensor 272, e.g. the ambient temperature of the refrigerator exceeds a predetermined threshold is changed by the controller 268 to the transmission mode to make an adjustment of the refrigerant amount to the prevailing boundary conditions. Thus, e.g. In tropical boundary conditions (high refrigerant line due to high ambient temperatures at high humidity) condensation of moisture on the suction tube 266 can be prevented.

Furthermore, the refrigerant circuit 200 may serve to cool a third refrigeration compartment in addition to the first refrigeration compartment 102 designed as a freezer compartment and the second refrigeration compartment 104 designed as a refrigeration compartment, for example a freshness compartment or even further refrigeration compartments, such as a fourth or fifth refrigeration compartment, etc .. Each of the cold storage is then associated with an evaporator, which is arranged in a parallel branch of the refrigerant circuit 200. Consequently Accordingly, the first diverter valve 208 has a number of outputs corresponding to the number of parallel branches and the second diverter valve 218 has a corresponding number of inputs. Furthermore, the first deflection valve 208 and the second deflection valve 218 then have a number of switching positions corresponding to the number of parallel branches.

Reference number list

100

The refrigerator

102

first cold compartment

104

second cold compartment

200

Refrigerant circulation

202

compressor

204

condenser

206

stop valve

208

first diverter valve

210

first throttle

212

second throttle

214

first evaporator

216

second evaporator

218

second diverter valve

220

Manifold throttle tube heat exchanger

222

Input of the first diverter valve

224

first output of the first diverter valve

226

second output of the first diverter valve

228

first input of the second diverter valve

230

second input of the second diverter valve

232

Output of the second diverter valve

234

compressor output

236

condenser inlet

238

condenser exit

240

input port

242

output port

244

Throttle input of the first throttle

246

Throttle output of the first throttle

248

Evaporator inlet of the first evaporator

250

Evaporator outlet of the first evaporator

252

Throttle input of the second throttle

254

Throttle output of the second throttle

256

Evaporator input of the second evaporator

258

Evaporator outlet of the second evaporator

260

heat exchanger inlet

262

heat exchanger output

264

compressor inlet

266

suction tube

268

control

270

control line

272

temperature sensor

274

first parallel branch

276

second parallel branch

278

main branch

280

control lines

282

control lines

Claims (8)

1. Refrigerator (100) with a refrigerant circuit (200) which has a compressor (202) and at least a first evaporator (214) and a second evaporator (216), wherein the refrigerant circuit (200) has a main branch (278) and at least a first parallel branch (274) and a second parallel branch (276), wherein the compressor (202), the first evaporator (214) and the second evaporator (216) are arranged in the main branch (278), in the first parallel branch (274) and in the second parallel branch (276) in each case, and wherein a diverter valve (208) with an input (222) and at least a first output (224) and a second output (226) is arranged between a compressor output (234) of the compressor (202) and an evaporator input (248) of the first evaporator (214) and an evaporator input (256) of the second evaporator (216), wherein the input (222), the first output (224) and the second output (226) are connected to the main branch (278), to the first parallel branch (274) and to the second parallel branch (276) so as to conduct refrigerant in each case, wherein a second diverter valve (218) with at least a first input (228) and a second input (230) and an output (232) is arranged between a compressor input (264) of the compressor (202) and an evaporator output (250) of the first evaporator (214) and an evaporator output (258) of the second evaporator (216), wherein the first input (230), the second input (230) and the output (232) are connected to the first parallel branch (274), to the second parallel branch (276) and to the refrigerant circuit (200) so as to conduct refrigerant in each case, characterised in that the refrigerator (100) has a controller (268) which is connected at least to the first diverter valve (208) and to the second diverter valve (218) in order to actuate the first diverter valve (208) and the second diverter valve (218) and the controller (268) is configured such that the refrigerator (100) is operated in a normal mode, in which the first diverter valve (208) is at least temporarily in a first switch position and the second diverter valve (218) is at the same time in a first switch position, wherein in the first switch position of the first diverter valve (208), the first output (224) of the first diverter valve (208) is connected, in a manner permitting the flow of refrigerant, to the evaporator input (248) of the first evaporator (214) and the second output (226) of the first diverter valve (208) is blocked in a manner preventing the flow of refrigerant, and wherein in the first switch position of the second diverter valve (218), the first input (228) of the second diverter valve (218) is connected, in a manner permitting the flow of refrigerant, to the evaporator output (250) of the first evaporator (214), and the second input (230) of the second diverter valve (218) is blocked in a manner preventing the flow of refrigerant, and the refrigerator (100) is operated in a further normal mode in which the first diverter valve (208) is at least temporarily in a second switch position and the second diverter valve (218) is at the same time in a second switch position, wherein in the second switch position of the first diverter valve (208), the second output (226) of the first diverter valve (208) is connected, in a manner permitting the flow of refrigerant, to an evaporator input (256) of the second evaporator (216), and the first output (224) of the first diverter valve (208) is blocked in a manner preventing the flow of refrigerant, and wherein in the second switch position of the second diverter valve (218), the second input (230) of the second diverter valve (218) is connected, in a manner permitting the flow of refrigerant, to an evaporator output (258) of the second evaporator (216) and the first input (228) of the second diverter valve (218) is blocked in a manner preventing the flow of refrigerant.
2. Refrigerator (100) according to claim 1, characterised in that a first throttle (210) is arranged between the first diverter valve (208) and the evaporator input (248) of the first evaporator (214) and a second throttle (212) is arranged between the second diverter valve (218) and the evaporator input (256) of the second evaporator (216).
3. Refrigerator (100) according to claim 2, characterised in that a capillary tube-suction line heat exchanger (220) is arranged in the refrigerant circuit (200) between the compressor (202) and the first evaporator (214) and the second evaporator (216) and is connected in a heat-transmitting manner to the first throttle (210) and/or to the second throttle (212).
4. Refrigerator (100) according to one of the preceding claims, characterised in that the refrigerator (100) can be operated in a transmission mode in which the first diverter valve (208) is at least temporarily in a first switch position and the second diverter valve (218) is at the same time in a second switch position, wherein in the first switch position of the first diverter valve (208), the first output (224) of the first diverter valve (208) is connected, in a manner permitting the flow of refrigerant, to the evaporator input (248) of the first evaporator (214) and the second output (226) of the first diverter valve (208) is blocked in a manner preventing the flow of refrigerant, and wherein in the second switch position of the second diverter valve (218), the second input (230) of the second diverter valve is connected, in a manner permitting the flow of refrigerant, to an evaporator output (258) of the second evaporator (216), and the first input (228) of the second diverter valve (218) is blocked in a manner preventing the flow of refrigerant.
5. Refrigerator (100) according to one of the preceding claims, characterised in that the refrigerator (100) can be operated in a transmission mode, in which the first diverter valve (208) is at least temporarily in a second switch position and the second diverter valve (218) is at the same time in a first switch position, wherein in the second switch position of the first diverter valve (208), the second output (226) of the first diverter valve (208) is connected, in a manner permitting the flow of refrigerant, to an evaporator input (256) of the second evaporator (216) and the first output (224) of the first diverter valve (208) is blocked in a manner preventing the flow of refrigerant, and wherein in the first switch position of the second diverter valve (218), the first input (228) of the second diverter valve (218) is connected, in a manner permitting the flow of refrigerant, to the evaporator output (250) of the first evaporator (214) and the second input (230) of the second diverter valve (218) is blocked in a manner preventing the flow of refrigerant.
6. Refrigerator (100) according to one of the preceding claims, characterised in that the refrigerant circuit (200) has a condenser (204), wherein a stop valve (206) is provided between the condenser (204) and the first diverter valve (218).
7. Refrigerator (100) according to one of the preceding claims, characterised in that in a transmission mode with a powered compressor (202) a stop valve (206) at least temporarily prevents a flow of refrigerant in the refrigerant circuit (200).
8. Refrigerator (100) according to one of the preceding claims, characterised in that the refrigerator (100) has a controller (268) which is connected to a temperature sensor (272) at least for the transmission of measuring signals.

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