JP2008286473A - Refrigerating cycle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerating cycle device improved in a progress rate by spraying water to a radiator. <P>SOLUTION: A refrigerant flow channel is constituted so that the refrigerant flow in a heat exchanger and the flow of drippage on the radiator caused by water spraying are opposed to each other, cascade utilization of heat can be achieved, performance can be improved, the amount of water discarded without evaporated can be minimized, and water spraying efficiency can be improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a refrigeration cycle apparatus that sprinkles water on a radiator to improve performance.

  Conventionally, a cooling device for a condenser for an air conditioner that improves the cooling effect of the condenser in a refrigeration cycle has been proposed.

  As a conventional example, a compressor that circulates refrigerant, a flow path switching means that switches refrigerant flow, a radiator, and a load-side heat exchanger are sequentially connected by a pipe, and a refrigerant including at least carbon dioxide is circulated as a refrigerant to load. A refrigerant circuit that can be switched between a cooling operation and a heating operation in the side heat exchanger, and a part of the radiator or a part of the load side heat exchanger provided in at least one of the radiator and the load side heat exchanger And a refrigeration cycle apparatus characterized in that water is sprayed to a part of a radiator or a load side heat exchanger to which a high-pressure refrigerant discharged from a compressor is supplied. For example, see Patent Document 1).

  As another conventional example, a refrigerant circuit that performs a refrigeration cycle by connecting a compressor, a heat radiator that exchanges heat between the air and the refrigerant, an expansion mechanism, and a use-side heat exchanger and setting the refrigerant discharged from the compressor to a supercritical state And a refrigeration apparatus comprising a watering means for spraying water on the surface of the radiator. (For example, see Patent Document 2)

Japanese Patent Laying-Open No. 2006-308166 (5th page, FIG. 1) JP 2006-162152 A (page 3, FIG. 1)

  In such a conventional example, when water was sprayed on the radiator, the relationship between the flow of water that could not be evaporated by gravity and the flow of refrigerant flowing inside the radiator was not considered, Since the branch pattern of the coolant channel, the position of the watering nozzle, and the like were not taken into consideration, there was a problem that the performance improvement by watering could not be obtained sufficiently. In particular, when CO2 is used as the refrigerant, the temperature gradient in the radiator is large, and the refrigerant flow inside the radiator, the branch pattern of the refrigerant flow path, and the water spray nozzle position have a large effect on COP and capacity improvement. However, the conventional method has a problem that the performance improvement effect by watering cannot be obtained sufficiently.

  An object of the present invention is to provide a refrigeration cycle apparatus that improves the sprinkling effect by performing cascade use of heat in consideration of the refrigerant flow inside the radiator and the flow of dispersed water.

  According to the present invention, a refrigeration cycle comprising a compressor, a radiator, an expansion valve, an evaporator, and a refrigerant circuit connected by a connecting pipe that sequentially connects these, and a watering device that sprinkles the radiator, and circulates the refrigerant. In the apparatus, the radiator flows in the refrigerant from the lower part of the radiator and flows out from the upper part, and the water sprayed on the radiator from the watering device flows on the radiator from the upper part to the lower part, A refrigeration cycle apparatus characterized by being in a counterflow with the refrigerant flow in the radiator is obtained.

  According to the refrigeration cycle apparatus of the present invention, in the heat source side heat exchanger, a refrigerant having a high temperature flows from the lower part of the radiator, moves upward while exchanging heat, and a refrigerant having a lowered temperature flows from the upper part of the radiator. Since the refrigerant flow path is configured, when water is sprayed on the radiator, the flow of water that could not be evaporated and the flow of the refrigerant flowing inside the radiator are opposed to each other, Cascade utilization of heat can be performed and the watering effect can be increased. In addition, by increasing the evaporation rate of water, the amount of water discarded without evaporating is reduced.

Embodiment 1 FIG.
The refrigeration cycle apparatus in Embodiment 1 of the present invention will be described below. FIG. 1 is a diagram showing a refrigeration cycle apparatus according to Embodiment 1 of the present invention. The refrigeration cycle apparatus of the present embodiment includes an outdoor unit 101 and an indoor unit 102, a refrigerant circuit 105 including a connection pipe 104 that connects the outdoor unit 101 and the indoor unit 102, and a water spray device 103. For example, CO2 is enclosed as a refrigerant and the high pressure side is operated in a supercritical state.

  The outdoor unit 101 includes a compressor 1 that circulates refrigerant, a radiator 2, an expansion valve 3, a connection pipe 104 that sequentially connects the compressor 1, the radiator 2, and the expansion valve 3, and an inside of the radiator 2. The outdoor fan 5 that blows outdoor air that exchanges heat with the refrigerant is provided, and the outdoor fan 5 is provided in the vicinity of the radiator 2.

  The indoor unit 102 includes an evaporator 4 and an indoor fan 6 that sends indoor air that exchanges heat with the refrigerant inside the evaporator 4, and the indoor fan 6 is provided in the vicinity of the evaporator 4.

  Both the radiator 2 and the evaporator 4 are constituted by fin-and-tube heat exchangers, the fins 24 are installed in the vertical direction, and the heat transfer tubes 25 are arranged horizontally so as to be perpendicular to the fins 24.

  FIG. 2 is a schematic diagram illustrating the radiator 2 and its surroundings when water is sprayed on the radiator 2 according to the first embodiment, FIG. 2 (A) is a side view, and FIG. 2 (B) is a front view. It is. As shown in FIGS. 1 and 2, the radiator 2 includes a branch portion 21 and a junction portion 22. In the branching section 21, the heat transfer tube 25 is branched into two from the inlet, and two branch flow paths 25a and 25b through which the refrigerant flows in parallel, respectively. In the merging portion 22, the two branch flow paths 25a and 25b are merged, and the refrigerant flows through the single flow path 25c. The junction portion 22 is disposed above the branch portion 21, and the refrigerant flow path in the heat transfer tube 25 is configured such that the refrigerant flows from the bottom to the top inside the junction portion 22.

  Further, the fin 24 extends continuously from the branch portion 21 having the plurality of branch passages 25a and 25b of the radiator 2 and the junction portion 22, but the branch portion 21 and the junction portion 22 of the fin 24 For example, a heat blocking slit 23 for blocking heat transfer is provided in a portion between the two. The heat blocking slit 23 can also be used to prevent heat transfer between the branch portions between the high temperature portion and the low temperature portion.

  As shown in FIG. 3, the watering device 103 includes a large-flow watering nozzle 31 </ b> A, a small-flow watering nozzle 31 </ b> B, a watering amount adjustment valve 32, a water supply pipe 36 connecting them, a temperature sensor 34, a humidity sensor 35, a watering device. A water amount control device 33 is provided. The outside air temperature and humidity are detected by the temperature sensor 34 and the humidity sensor 35, and the water spray amount is adjusted by the water spray amount control device 33 according to the detected value. One end of the water supply pipe 36 is connected to, for example, a water pipe 37, and the other end is connected to the watering nozzles 31 </ b> A and 31 </ b> B via the watering amount adjustment valve 32.

  The amount of water sprayed on the radiator 2 is adjusted by the water spray amount adjustment valve 32. The sprinkling amount control device 33 controls the sprinkling amount adjustment valve 32 based on the values detected by the temperature sensor 34 and the humidity sensor 35, and the sprinkling effect is low when the outdoor temperature is low or the outdoor humidity is high. Reduce the amount of water or stop spraying water to avoid unnecessary watering.

  The water sprinkler 103 spreads water only to the junction part 22 arranged above the branch part 21 of the radiator 2. For this reason, since water is concentrated and sprayed on the confluence | merging part from which refrigerant | coolant temperature falls and it is difficult to heat-exchange, heat dissipation of a confluence | merging part becomes easy. Concentrated water spraying at the junction at the upper part of the radiator allows the lower part of the radiator to be cooled using dripping water that does not evaporate at the junction and can be used in a cascade of heat. In addition, since the dripping water evaporates with the dry fins at the bottom of the radiator, the unevaporated water can be eliminated.

  In the present embodiment, the watering nozzle 31 is disposed horizontally (as shown in FIG. 4, the central axis 31 c of the watering nozzle 31 is perpendicular to the main surface of the radiator 2), and water is concentrated on the merging portion 22. Therefore, as shown in FIGS. 1 to 3, the arrangement of the large flow watering nozzle 31 </ b> A and the small flow watering nozzle 31 </ b> B is staggered. Staggered arrangement means that when multiple water spray nozzles are arranged in multiple rows in the direction of gravity, the vertical positions of the upper water spray nozzle and the lower water spray nozzle are misaligned, resulting in a zigzag and a lower part between the upper water spray nozzles. It is a form of the watering nozzle arrangement | positioning by which a watering nozzle is arrange | positioned. In addition, in the present embodiment, the large-flow sprinkling nozzle 31B is arranged at the upper part and the small-flow sprinkling nozzle 31B is arranged at the lower part so that the sprinkling quantity of the upper sprinkling nozzle is larger than the sprinkling quantity of the lower sprinkling nozzle. Yes.

  FIG. 4 shows a diagram of the wet state of the radiator 2 when water is sprayed. The water sprayed from the watering nozzle 31 is divided into water that evaporates in the air before reaching the fins 24, water that evaporates after the fin contacts, and water that does not evaporate and drops on the surface of the fins. Are the adhering surface 902 on which the spray droplets directly adhere, the wet surface 901 formed by the water that does not evaporate and dripping the fin surface, and the wet surface 901 evaporates from both ends where the amount of dripped water is small and dries dry 903 are formed. As a result, a trapezoidal wetting surface 901 with a short bottom is formed as shown in FIG. From this, the dry surface 903 exists in the lower part of the heat radiator 2.

  In the present embodiment, a small flow rate water spray nozzle 31B is arranged in a lower portion of the large flow rate water spray nozzle 31A so that the dry surface 903 at the lower part of the heat exchanger becomes the wet surface 901, and the lower water spray nozzle 31B is the upper water spray nozzle. Since the water is spread thinly and widely so as to fill the gap of 31A, the wetting surface 901 can be uniformly formed on the fins 24 of the heat exchanger with a small amount of water spray.

  The operation of the refrigeration cycle will be described with reference to FIGS. FIG. 5 is a Ph diagram showing experimental results when water is sprayed on the radiator 2 with constant cooling capacity and when water is not sprayed in a refrigeration cycle using carbon dioxide as a refrigerant.

  A cycle when water is not sprayed on the radiator 2 is indicated by a broken line a. The high-temperature and high-pressure gas refrigerant R1 discharged from the compressor 1 dissipates heat in the radiator 2, and becomes a high-temperature and high-pressure liquid refrigerant R2. The liquid refrigerant R2 is depressurized by the expansion valve 3 to become a low-pressure gas-liquid two-phase refrigerant R3, and heat is exchanged by the evaporator 4 to become a low-pressure gas refrigerant R4, which becomes a general refrigeration cycle sucked by the compressor 1. Yes.

  The cycle when water is sprayed is indicated by a solid line a. Since the heat transfer performance of the radiator 2 is improved by watering, the high pressure is reduced compared to the case of the dotted line without watering, and the enthalpy difference at the inlet / outlet of the heatsink 2 is changed from ΔH to ΔH 'compared to the case without watering. To increase.

  Since the high pressure is reduced, the input of the compressor is reduced, and the enthalpy difference at the entrance and exit of the radiator 2 is increased, so that the COP is improved.

  In an apparatus in which the high pressure side is in a supercritical state, the temperature of the indoor blown air is low during heating operation, so that the heat exchanger outlet temperature can be lowered to obtain a relatively high COP. However, during the cooling operation, outdoor blown air is used. Since the temperature is higher than that during heating operation, the temperature at the outlet of the radiator 2 becomes high, and a high COP cannot be obtained. That is, during the cooling operation, the outlet refrigerant temperature of the radiator 2 must be higher than the outside air temperature, and the enthalpy difference at the inlet / outlet of the evaporator serving as the use side heat exchanger is reduced.

  In this embodiment, the surface of the radiator 2 is provided with means for sprinkling water having a temperature lower than that of the inlet air, and the amount of heat released by spraying water on the radiator 2 serving as a radiator can be increased. it can. As a result, the refrigerant inlet enthalpy of the evaporator 4 serving as an evaporator can be increased, and the cooling capacity and COP can be improved.

  In addition, a major feature of CO2 that is in a supercritical state is that, as shown in FIG. 5, the interval between the isothermal lines at the radiator outlet is wider (specific heat is larger) than that of the fluorocarbon refrigerant. Due to this characteristic, CO2 has a larger enthalpy change with respect to the same temperature drop than that of a fluorocarbon refrigerant. Therefore, in this embodiment, water is intensively sprayed at the junction 22 which is the outlet portion of the radiator 2, dripped water that cannot be evaporated is effectively used, and the effect of water spraying that uses heat cascade is maximized. Since it can be used, it is possible to reduce the amount of water that has not been evaporated and wasted.

  The use of heat cascade, which is a feature of the present invention, will be described with reference to FIGS. FIG. 6 shows changes in water and refrigerant temperatures in the present embodiment, with the horizontal axis representing temperature and the vertical axis representing the radiator height. The temperature transition of water is indicated by an arrow a, and the temperature rises as the height of the radiator decreases. In the present embodiment, the temperature transition of the refrigerant is indicated by an arrow b, the radiator 2 has two branches, and there are two arrows b. The refrigerant temperature decreases as the height of the radiator increases. The inlet temperature of the air is indicated by C and is a constant value.

  In the present embodiment, water having a temperature lower than that of air is intensively sprinkled at the junction 22 which is the outlet portion of the radiator 2 where it is difficult to obtain a temperature difference between the refrigerant temperature and the air. The refrigerant temperature at the outlet of the merging portion 22 can be lowered as compared with the case where it is. In addition, since a refrigerant having a high temperature flows in from the lower part of the radiator 2 and a refrigerant having a lowered temperature flows out from the joining part 22 arranged in the upper part of the radiator 2, when water is sprinkled into the joining part 22, The flow of dripped water and the refrigerant become counterflows, and the heat exchange efficiency can be increased.

  From the above, in the present embodiment, in the heat exchanger having a plurality of branch flow paths, water is sprayed at a low temperature in the portion where the refrigerant temperature is lowered, and the portion where the refrigerant temperature is high is cooled with air. Cool well and can use heat cascade.

  FIG. 7 shows the temperature transition A of the refrigerant when water is not sprayed, the temperature transition B of the refrigerant when water is sprayed to the radiator 2 inlet, and the refrigerant temperature when water is sprayed in the counterflow according to this embodiment. A temperature transition C is shown.

  When watering is not performed, as shown by A, the temperature of the refrigerant does not drop below the air temperature. In B, since the inlet part of the radiator 2 having a high temperature is cooled by watering, the temperature rapidly decreases in the vicinity of the inlet, but the refrigerant temperature flowing in the radiator 2 in the vicinity of the outlet cannot be lowered below the inlet temperature of the air. .

  In the case of C sprinkled on the outlet side of the radiator 2 as in the present invention, the refrigerant at the inlet of the radiator 2 having a high temperature is heat-exchanged with air corresponding to the temperature, and the refrigerant temperature is close to the air temperature. Since the refrigerant at the outlet of the vessel 2 can exchange heat with water having a temperature lower than that of the inlet air, the amount of heat exchange can be increased and the refrigerant can be cooled to the air inlet temperature or lower. As a result, efficient cascade use of heat is implemented.

  In the present embodiment, the radiator 2 is configured such that the flow of water that cannot be evaporated dripping by gravity and the flow of the refrigerant flowing inside the radiator 2 are opposed to each other. Therefore, as shown in FIG. 6, the water temperature (a) is low at the upper part of the radiator 2 and becomes higher as it drops to the lower part, and can finally be evaporated. The temperature (b) of the refrigerant flowing inside the radiator is higher at the lower part of the radiator 2 and becomes lower as it flows into the upper part. Therefore, normally, the temperature difference between the refrigerant temperature and the air temperature becomes small, and the refrigerant can be efficiently cooled by sprinkling the low-temperature water in the portion where the refrigerant temperature is low and heat exchange is difficult.

  In general, carbon dioxide has a critical temperature lower than that of chlorofluorocarbon-based refrigerants, so it easily becomes a supercritical cycle, and can be safely handled because it has neither toxicity nor flammability. In addition, since the ozone depletion coefficient and the global warming coefficient are lower than those of chlorofluorocarbon-based refrigerants, it is possible to provide a refrigeration apparatus that is friendly to the global environment.

  FIG. 8 shows a radiator configuration when the heat transfer tubes 25 of the radiator 2 are arranged in two rows. In the present embodiment, an example of a single-row heat exchanger has been shown. However, as shown in FIGS. 8A and 8B, a heat radiator 2 having two or more rows of heat transfer tubes 25 may be used. In this case, the refrigerant flow path may be arranged as shown in FIG. 8A so that the refrigerant flow in the second and subsequent rows of the heat transfer tubes 25 is also opposite to the water flow. Or what is necessary is just to make it the refrigerant | coolant flow of a last exit part turn into a counterflow with the flow of water as shown in FIG.8 (b).

  Also, when there is heat transfer between rows in two or more rows, as shown in FIG. 8B, in order to prevent heat transfer in each row, between the high temperature portion and the low temperature portion of the fin 24. A heat blocking slit 23 may be provided in the vertical direction, for example, for blocking heat transfer.

  As described above, in the present embodiment, in the heat source side heat exchanger, the refrigerant having a high temperature flows from the lower part of the radiator, moves toward the upper part while exchanging heat, and the refrigerant having the lowered temperature flows from the upper part of the radiator. Since the refrigerant flow path is configured as described above, when water is sprayed on the radiator 2, the flow of water that could not be evaporated by gravity and the flow of the refrigerant flowing inside the radiator become an opposite flow. , Cascade use of heat can be done and watering effect can be increased.

  Further, in the present embodiment, the refrigerant flow path at the inlet of the radiator 2 is branched into a plurality, the refrigerant merges after radiating heat at the branched radiator 2, and the merged refrigerant enters the radiator 2 again to dissipate heat, That is, since the radiator 2 is composed of the branch portion 21 and the junction portion 22 having a plurality of branch flow paths, and the heat is radiated at the junction portion 22 after radiating heat at the branch portion 21, the flow rate of the refrigerant passing through the junction portion 22 is branched. It increases than the refrigerant flow rate of the part. Therefore, the speed of the refrigerant passing through the junction 22 increases, the heat transfer coefficient increases, and the amount of heat exchange at the junction increases. In the present invention, water is sprinkled on the radiator 2 having the above-described configuration, and the amount of heat exchange can be increased because the refrigerant in the radiator 2 exchanges heat with water lower than the air temperature. From the above, in the present invention, the effect of watering can be made higher than before, and the refrigeration cycle efficiency can be improved.

  Further, in the present embodiment, the radiator joining portion through which the refrigerant whose temperature has decreased due to heat exchange passes is arranged above the branching portion, and the refrigerant flow path of the joining portion is from below to above. Since it is configured to flow, when water is sprayed on the radiator, the flow of water that is dropped by gravity without evaporating and the flow of refrigerant become counterflows, and there is an effect that heat can be used in cascade.

  Moreover, in this Embodiment, since water is concentrated and sprayed on the confluence | merging part where refrigerant | coolant temperature falls and it is difficult to heat-exchange, it becomes easy to perform the thermal radiation of a confluence | merging part. The merging part has a structure that is arranged above the branch part, and by concentrating water on the merging part at the upper part of this radiator, the lower part of the radiator is used by dripping water that does not evaporate at the merging part. Cool and use heat cascade. In addition, since the dripping water evaporates with the dry fins at the bottom of the radiator, the unevaporated water can be eliminated.

  In the present embodiment, since the fin 24 is provided with a slit that blocks the heat transfer between the high temperature part and the low temperature part of the radiator 2, the heat transfer from the high temperature part to the low temperature part (heat exchanger outlet part) is prevented. It has the effect of disappearing.

  In addition, since the watering nozzles are arranged in a staggered manner in the present embodiment, the dry surface that has increased at the bottom of the heat exchanger can be accurately made a wet surface, and the sprayed water can be used to the maximum extent. There is.

  Further, in this embodiment, since the amount of water applied to the upper fin of the radiator 2 is larger than the amount of water applied to the lower fin of the radiator 2, the water dripped at the upper portion of the radiator 2 can be used effectively at the lower portion, and the non-evaporated water The effect of minimizing the amount of water and suppressing excessive watering.

  Further, in the present embodiment, since the outside air temperature and the outside air humidity are detected and the water spray amount is adjusted according to the detected value, there is an effect that excessive water spraying by the water spraying means can be suppressed.

  Further, in the present embodiment, carbon dioxide, which has a wider interval of isothermal lines at the outlet of the radiator than the chlorofluorocarbon refrigerant, is used as the refrigerant in the refrigerant circuit, so that the enthalpy change at the same temperature change is increased. It is possible to obtain a great watering effect.

Embodiment 2. FIG.
Hereinafter, the refrigeration cycle apparatus of Embodiment 2 will be described. Since the configuration of the refrigeration cycle apparatus is the same as that of the first embodiment, detailed description is omitted, and only different parts are shown below.

  In the first embodiment, the radiator is branched into a plurality of flow paths. However, in this embodiment, as shown in FIG. 9, the heat transfer tube 25 of the radiator 2 has a temperature without branching into the plurality of flow paths. The refrigerant having a high temperature flows in from the lower part of the radiator 2 and flows to the upper part, and the refrigerant having a lowered temperature flows out from the upper part of the radiator 2. Therefore, the heat radiator 2 does not have a branch part and a junction part. In the first embodiment, carbon dioxide is used as the refrigerant, but in the present embodiment, a fluorocarbon refrigerant is used.

  In the first embodiment, the watering nozzles 31 of the watering device 103 are arranged horizontally and the watering nozzles are arranged in a staggered manner in order to scatter water intensively at the merging portion 22, whereas in the present embodiment, the watering nozzles 31 are arranged outdoors. It is installed above the machine 101 and is inclined so that more water is applied to the upper part than the lower part of the radiator 2 (an arrangement in which the central axis 31c of the watering nozzle 31 is inclined with respect to the main surface of the radiator 2 in the vertical plane). ) Also in this example, a water sprinkling surface 902, a wet surface 901, and a dry surface 903 similar to those in FIG. 4 are formed.

  Since the water spray nozzles are inclined, the droplets ejected from the water spray nozzles spread in an elliptical shape and the area where the water droplets overlap each other is reduced, and the attachment surface 902 that becomes wet due to the attachment of the water droplets increases, and the wet surface 901 And the total area becomes larger and the dry surface 903 becomes smaller. Accordingly, the watering effect is enhanced, and the non-evaporated dripping water is reduced to enable efficient watering.

  The operation of the refrigeration cycle will be described with reference to FIGS. FIG. 10 is a Ph diagram plotting the cycle when water is sprayed on the radiator 2 and when water is not sprayed when the cooling operation is performed under a constant capacity condition.

  A cycle when water is not sprayed on the radiator 2 is indicated by a dotted line a. The high-temperature and high-pressure gas refrigerant R1 discharged from the compressor 1 dissipates heat in the radiator 2, and becomes a high-temperature and high-pressure liquid refrigerant R2. The liquid refrigerant R2 is depressurized by the expansion valve 3 to become a low-pressure gas-liquid two-phase refrigerant R3, and heat is exchanged by the evaporator 4 to become a low-pressure gas refrigerant R4, which becomes a refrigeration cycle sucked into the compressor 1.

  The cycle when water is sprayed is represented by a solid line a. Sprinkling improves the heat transfer performance of the radiator 2 and lowers the internal refrigerant temperature, so that the high pressure is reduced and the degree of supercooling is increased as compared to the case without watering (R2 ′). Since the degree of supercooling increases, the enthalpy difference at the entrance and exit of the radiator 2 increases from ΔH to ΔH ′.

  Further, since the high pressure is reduced, the input of the compressor is reduced, and the enthalpy difference at the entrance and exit of the radiator 2 is increased, so that the COP is improved.

  In the present embodiment shown in FIG. 9, an example in which the heat transfer tube 25 is one row of the radiator 2 is shown. However, as shown in FIGS. 8A and 8B, the radiator having two or more rows of the heat transfer tubes 25. 2 is also acceptable. In this case, the refrigerant flow path may be arranged as shown in FIG. 8A so that the refrigerant flow in the second and subsequent rows of the heat transfer tubes 25 is also opposite to the water flow. Or what is necessary is just to make it the refrigerant | coolant flow of a last exit part turn into a counterflow with the flow of water as shown in FIG.8 (b).

  Also, when there is heat transfer between rows in two or more rows, as shown in FIG. 8B, in order to prevent heat transfer in each row, between the high temperature portion and the low temperature portion of the fin 24. A heat blocking slit 23 may be provided in the vertical direction, for example, for blocking heat transfer.

  As described above, in the present embodiment, in the radiator 2 that is the heat source side heat exchanger, the refrigerant having a high temperature flows from the lower portion of the radiator 2, moves upward while exchanging heat, and flows out from the upper portion of the radiator 2. Since the radiator 2 refrigerant flow path is configured so that when water is sprayed on the radiator 2, the flow of water that could not be evaporated and the flow of refrigerant flowing through the radiator 2 face each other. Since it becomes a flow, the heat can be used in cascade and the watering effect can be increased.

  In the present embodiment, when there is heat transfer between rows using two or more heat transfer tubes, the heat transfer between the high temperature portion and the low temperature portion of the heat source side heat exchange, for example, heat A blocking slit may be provided, and there is an effect that loss due to heat transfer from the high temperature portion to the low temperature portion (heat exchanger outlet portion) is eliminated.

  Further, in this embodiment, the amount of water applied to the radiator upper fin is larger than the amount of water applied to the radiator lower fin. It is possible to limit excessive water spraying as much as possible.

  Moreover, in this Embodiment, since the watering nozzle was inclined and arrange | positioned, there exists an effect that it can cool by the water quantity in order from the radiator 2 exit which is hard to exchange heat with air.

  Since the watering nozzle is inclined, the amount of water applied to the fins at the top of the radiator is larger than the amount of water applied to the bottom of the radiator, and cooling can be performed with a large amount of water in order from the radiator outlet where heat exchange with the air is difficult. Since the water that does not evaporate at the upper part of the radiator 2 and drops dripping can be used effectively at the lower part, the unevaporated water can be minimized and excessive water spray can be suppressed.

  Further, in the present embodiment, the outside air temperature and the outside air humidity are detected, and the amount of water spray is adjusted according to the detected value, so that excessive water spraying by the water spraying means can be suppressed.

It is a figure which shows the structure of the outdoor unit which concerns on Embodiment 1 of this invention, an indoor unit, and the internal refrigerating cycle apparatus. It is the (a) side view including the state of the radiator periphery at the time of watering the radiator which concerns on Embodiment 1, and (b) front view. It is a figure which shows the structure of the watering apparatus which concerns on Embodiment 1. FIG. It is the figure which showed the mode of the fin at the time of spraying water with a watering nozzle. It is a figure which shows operation | movement of this refrigeration cycle apparatus on the pressure-enthalpy diagram of CO2 which concerns on Embodiment 1. FIG. It is a figure which shows the usefulness of the exit part concentration watering of the heat radiator which concerns on Embodiment 1. FIG. It is the figure which showed transition with respect to the height direction of the heat radiator of the water temperature which flows through the heat radiator surface which concerns on Embodiment 1, and the refrigerant | coolant temperature which flows through the inside. It is a figure which shows the modification of the path pattern of the heat radiator which concerns on Embodiment 1, and the watering method. It is a figure which shows operation | movement of this refrigeration cycle apparatus on the pressure-enthalpy diagram based on Embodiment 2. FIG. It is the side view and front view including the state of a radiator periphery at the time of watering the radiator which concerns on Embodiment 2. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Compressor, 2 Radiator, 3 Expansion valve, 4 Evaporator, 5 Outdoor fan, 6 Indoor fan, 21 Branch part, 22 Merge part, 23 Heat interruption slit, 24 Fin, 25 Heat transfer pipe, 25a, 25b Branch flow path , 25 Heat transfer tube, 31 Sprinkling nozzle, 31A Large flow sprinkling nozzle, 31B Small flow sprinkling nozzle, 32 Sprinkling amount adjustment valve, 33 Sprinkling amount control device, 34 Outdoor temperature sensor, 35A, 35B sensor, 101 Outdoor unit, 102 Indoor unit , 103 Water sprinkler, 104 Connection piping, 105 Refrigerant circuit, 901 Wetting surface.

Claims (9)

In a refrigeration cycle apparatus comprising a compressor, a radiator, an expansion valve, an evaporator and a refrigerant circuit connected by a connecting pipe that sequentially connects these, and a watering device that sprinkles water to the radiator, and circulates the refrigerant,
The radiator allows the refrigerant to flow from the lower part of the radiator and flow out from the upper part, and the water sprayed on the radiator from the watering device flows on the radiator from the upper part to the lower part, and the radiator A refrigeration cycle apparatus, wherein the refrigeration cycle apparatus is opposed to the refrigerant flow inside.   The radiator is composed of a branch portion having a plurality of branch flow paths and a merge section where the plurality of branch flow paths merge, and at least a heat transfer tube of the merge section is configured so that the refrigerant flows from the bottom to the top. The refrigeration cycle apparatus according to claim 1.   The refrigeration cycle apparatus according to claim 2, wherein the merging portion is disposed above the branching portion.   The refrigeration cycle apparatus according to claim 3, wherein the water sprinkler sprays water only to the merging portion.   The refrigeration cycle apparatus according to any one of claims 1 to 4, wherein a fin between the high temperature portion and the low temperature portion of the radiator includes a heat blocking slit that blocks heat transfer.   The refrigeration cycle apparatus according to any one of claims 1 to 5, wherein a plurality of the watering nozzles are provided and arranged in a staggered pattern.   The refrigeration cycle apparatus according to any one of claims 1 to 6, wherein the amount of water sprayed to the upper portion of the radiator is larger than the amount of water sprayed to the lower portion of the radiator.   The refrigeration cycle apparatus according to any one of claims 1 to 7, further comprising: a sensor that detects an outside air temperature and an outside air humidity; and a water spray amount control device that adjusts the water spray amount according to the detected value.   The refrigeration cycle apparatus according to any one of 1 to 8, wherein the refrigerant is carbon dioxide.

Images