JP2012067983A - Heat exchange unit, and refrigerating cycle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat exchange unit or the like, capable of achieving the shortening or the like of a defrosting period, without stirring the ambient atmosphere of a heat exchanger relating to the defrosting.SOLUTION: The heat exchange unit includes: a heat source side heat exchanger 16 for heat exchange of refrigerant with air; an adjustable blower 17 for forming flow of the air passing the heat source side heat exchanger 16; and controller 50 for performing a suppression control to suppress an air flow rate of the adjustable blower 17 upon decision that other heat source side heat exchangers 16 performs the defrosting.

Description

  The present invention relates to a heat exchange unit or the like having at least a heat exchanger constituting a refrigeration cycle apparatus (heat pump apparatus) such as a hot water supply apparatus or a refrigeration air conditioner and a blower for promoting heat exchange in the heat exchanger. is there. For example, the present invention relates to operation control in other units when some units perform defrosting in an environment where a plurality of heat exchange units are installed.

  In the refrigeration cycle apparatus, a refrigerant circuit is formed by connecting a compressor, a heat exchanger serving as a condenser, a flow rate adjusting valve serving as an expansion valve, and a heat exchanger serving as an evaporator to circulate the refrigerant. The target space is heated and cooled. At this time, for example, in the hot water supply apparatus, the hot water supply unit accommodates equipment constituting a refrigerant circuit such as a heat exchanger. Moreover, in a refrigeration air conditioner etc., it has the unit used as the heat source machine which has a compressor and a heat source side heat exchanger (outdoor heat exchanger), a flow control valve, and a load side heat exchanger (indoor heat exchanger). In some cases, the equipment constituting the refrigerant circuit is accommodated separately in units serving as load-side devices.

  In such a refrigeration cycle apparatus, for example, when a low-temperature refrigerant passes through a pipe in a heat exchanger that serves as an evaporator and heat exchange between the refrigerant and air through the pipe, the air is cooled, and moisture in the air is cooled. Frozen when condensed with fins or heat transfer tubes. When the frost accumulates (frosts), heat exchange with the air is not performed well. Therefore, the refrigeration cycle apparatus periodically performs a defrosting operation for removing frost adhering to the heat exchanger, for example.

  Conventionally, for example, in the state where a plurality of heat source units of a refrigeration air conditioner are installed, when defrosting is performed for the purpose of shortening the defrosting time, defrosting is simultaneously performed on all the heat exchangers. Simultaneous defrosting is performed. On the other hand, if the purpose is to perform defrosting while maintaining the room temperature, etc., defrosting is performed on some heat exchangers, and the remaining part or all of the heat exchangers are alternated to continue normal operation. Defrosting is performed (for example, refer to Patent Document 1).

  For example, when performing simultaneous defrosting, it defrosts in the state which stopped all the air blowers which a unit has. At this time, since the ambient atmosphere of the heat exchanger is not agitated, the ambient atmosphere temperature rises quickly, and the defrosting time is shortened accordingly. However, since no outdoor unit supplies heat to the indoor unit during defrosting, the water temperature or room temperature decreases. On the other hand, when performing alternate defrosting by a plurality of units, since there is a heat source device that performs normal operation, defrosting operation can be performed while maintaining the water temperature and room temperature.

  For example, defrosting may be required even in a unit such as a load-side device for the purpose of cooling a target product such as a showcase or a unit cooler. In such a unit, if simultaneous defrosting is performed, the temperature of the target product and the internal temperature rise, so alternate defrosting is performed to stabilize the product temperature and internal temperature (for example, Patent Document 2). reference).

Japanese Unexamined Patent Publication No. 61-231378 (FIG. 1) Japanese Patent No. 1683557

  When performing the alternate defrosting as described above, the heat exchange unit that is not performing the defrosting operation is performing the normal operation, and the air suction (intake air) for driving the blower and exchanging heat with the refrigerant ) And blowing (exhaust). For this reason, for example, the ambient atmosphere is agitated due to wind interference (short cycle) generated by the blower related to the adjacent heat exchanger, and therefore the heat exchange unit related to defrosting is affected by the surrounding unit. It takes time until the water temperature and the heating temperature rise, or frost is not melted, resulting in a longer defrosting operation time.

  Therefore, conventionally, a measure has been taken such that the distance between the heat exchangers, for example, is set to a distance that is not affected by the wind from the blower related to the other heat exchanger. In addition, in order to prevent the influence of wind as much as possible by installing a panel or the like, measures have been taken to block the wind by restricting the suction wind direction and the blowing wind direction. Furthermore, control measures such as performing defrosting to prevent frost from remaining undissolved by securing a long heating time for the heat exchanger even under the influence of wind have been taken.

  However, for example, when the distance is increased, it is necessary to secure a sufficient installation space. Moreover, when attaching a panel, a new member must be prepared separately and the space and effort for attaching a panel are needed. Further, when control measures are taken, there is a problem that the defrosting time becomes longer and unnecessary power is consumed because it is necessary to heat more than the state without wind.

  The present invention has been made to solve the above-described problems. For example, heat that can shorten the defrosting time without stirring the ambient atmosphere of the heat exchanger related to defrosting. The purpose is to obtain replacement units.

  The heat exchange unit according to the present invention includes a heat exchanger for performing heat exchange between the refrigerant and air, a blower that forms a flow of air passing through the heat exchanger, and another heat exchanger performing defrosting. If it judges that it is, it is provided with the control apparatus which performs the suppression control which suppresses the air volume of an air blower.

  The effect of the present invention is that when the control device determines that defrosting is performed in another heat exchanger, since the suppression control for suppressing the air volume by the blower is performed, for example, when performing alternate defrosting, The ambient atmosphere of the heat exchanger related to defrosting is not stirred so that the defrosting can be finished and the normal operation can be resumed. For this reason, operation efficiency can be improved as a whole apparatus (system), and the improvement of performance can be aimed at.

It is a figure showing the installation state of the hot water supply unit in Embodiment 1 of this invention. 2 is a diagram illustrating a device configuration and the like in a hot water supply unit 100. FIG. It is a figure showing the relationship between the air volume which passes a heat exchanger, and COP. It is a figure showing the flowchart of the process performed in alternate defrosting. It is a figure showing the relationship between driving time and ability. It is a figure showing the temperature change in the heat exchanger at the time of a defrost operation. It is a figure showing the structure of the load side apparatus 300 which concerns on Embodiment 6 of this invention. It is a figure showing the installation mode of the unit which concerns on Embodiment 7 of this invention.

Embodiment 1 FIG.
1 is an external view showing an outer shape of a hot water supply unit according to Embodiment 1 of the present invention. In the first embodiment, a hot water supply unit 100 having an apparatus that constitutes two heat pump systems (refrigerant circuits) on the same frame will be described as an example.

  FIG. 2 is a diagram illustrating a device configuration of the heat pump system in the hot water supply unit 100. The hot water supply unit 100 of the present embodiment has two independent refrigerant circuits A and B. Since each refrigerant circuit is independent, it has heat source side heat exchangers 16A and 16B that require defrosting and variable blowers 17A and 17B that send air to the heat exchangers (in the hot water supply unit 100). It will have two heat exchange units). And alternately defrosting can be performed at arbitrary timings with respect to the heat source side heat exchangers 16A and 16B in each refrigerant circuit. In the hot water supply unit 100 of the present embodiment, it is assumed that the devices related to the refrigerant circuits are separately installed in the casings 200A and 200B. Hereinafter, unless there is a particular need to distinguish, the same type of equipment may be described by a description with no suffix.

  As shown in FIG. 2, in the hot water supply unit 100 of the present embodiment, the compressor 11, the four-way switching valve 12, the load side heat exchanger 13, the expansion valve 14, the temperature sensor 15, the heat source side heat exchanger 16, and the variable. Each refrigerant circuit is configured by the air blower 17. The compressor 11 compresses and discharges the sucked refrigerant. Here, although not particularly limited, the compressor 11 changes the capacity of the compressor 11 (the amount of refrigerant sent out per unit time) by arbitrarily changing the operation frequency, for example, by an inverter circuit or the like. You may be able to do that. The four-way switching valve 12 is a valve serving as switching means for switching the refrigerant flow. In the present embodiment, a high-temperature gas (gas) refrigerant (hot gas) from the compressor 11 is passed through the heat source side heat exchanger 16 to circulate the refrigerant and perform a defrosting operation for defrosting. To do. For this reason, for example, the refrigerant flow is switched between the hot water supply operation and the defrosting operation so that the hot gas flows to the load side heat exchanger 13 side during the hot water supply operation and to the heat source side heat exchanger 16 side during the defrost operation. Allow hot gas to flow.

  The load-side heat exchanger 13 functions as a condenser in the present embodiment, performs heat exchange between the refrigerant and water, heats the water, and condenses and liquefies the refrigerant. The expansion valve 14 serving as a flow rate adjusting valve and a throttling device decompresses and expands the refrigerant, and adjusts the amount and pressure of the refrigerant passing through the load-side heat exchanger 13.

  In the present embodiment, the temperature sensor 15 detects the temperature of the refrigerant that has passed through the heat source side heat exchanger 16 during the defrosting operation, and transmits a temperature signal. A temperature signal related to detection by the temperature sensor 15 is sent to the control device 50 via the temperature sensor transmission line 30. The heat source side heat exchanger 16 is, for example, a plate fin tube heat exchanger having a plurality of fins and heat transfer tubes, and performs heat exchange between the refrigerant and air (outdoor air). In this embodiment, it functions as an evaporator and evaporates and vaporizes the refrigerant. The variable blower 17 includes, for example, a propeller fan and the like, and is driven so as to promote heat exchange between the refrigerant and the air in the heat source side heat exchanger 16 and sends air into the heat source side heat exchanger 16. Here, the variable blower 17 includes an inverter circuit and the like, and can change the rotation speed of the propeller fan based on an instruction signal from the control device 50 via the blower control line 31. Thereby, the air volume sent to the heat source side heat exchanger 16 can be changed.

  The control device 50 controls each device constituting the hot water supply unit 100. For this reason, operation control of two refrigerant circuits is performed. In particular, in the present embodiment, control is performed for the variable blower 17 related to the refrigerant circuit that performs the hot water supply operation during alternate defrosting. Here, it is assumed that the control device 50 has time measuring means (not shown) such as a timer. The inter-unit communication line 60 is a communication line used when signals are transmitted / received (communication) between the control devices 50 of the hot water supply units 100 when the hot water supply device includes a plurality of hot water supply units 100, for example.

  FIG. 3 is a diagram illustrating the relationship between the amount of air passing through the heat exchanger and the COP. In the present embodiment, alternate defrosting is performed in hot water supply unit 100. For example, when alternate defrosting is performed by general control, when the space between the casings 200 is 10 cm or less, the defrosting time is increased by about 1 minute. In addition, although depending on other conditions, the heating capacity and the COP related to the capacity are reduced by about 4% at the maximum.

  Therefore, in the hot water supply unit 100 of the present embodiment, the ambient atmosphere of the heat source side heat exchanger 16 related to the defrosting operation is agitated so that the defrosting time does not become long. For this reason, the air volume which concerns on the suction of the air by the variable blower 17 by the side of the refrigerant circuit which continues a hot water supply driving | operation, and blowing out is restrict | limited.

  In the refrigerant circuit in which the hot water supply operation is continued, the heat exchange efficiency between the refrigerant and the air is reduced because the air volume is reduced due to the restriction, so the COP is slightly lowered. However, when the distance between the casings 200 is within 10 cm, for example, as shown in FIG. 3, even if the air volume of the variable blower 17 related to the hot water supply operation is about 70% of the air volume at the maximum output, the COP related to the hot water supply operation is almost the same. (About 99.6% of 100% COP). For this reason, if suppression control is performed to an appropriate air volume, defrosting can be reliably ended without increasing the defrosting time in the heat source side heat exchanger 16 related to the defrosting operation without lowering the operation efficiency. (By shortening the defrosting time, about 2% improvement can be expected for the entire COP). Thereby, about the refrigerant circuit which concerns on a defrost operation, the return to normal operation can be accelerated, and operation efficiency can also be improved as the whole apparatus.

  FIG. 4 is a diagram illustrating a flowchart of processing performed by the control device 50 in alternate defrosting. Next, operation | movement of the hot water supply unit 100 in alternate defrosting, etc. are demonstrated based on FIG. The control device 50 measures the operation time after completion of the defrosting operation of each refrigerant circuit by using, for example, a timer. When it is determined that the operation time from the end of the defrosting operation has reached a predetermined time (S1, S11), control such as switching the four-way switching valve 12 in the refrigerant circuit is performed, and the equipment constituting the refrigerant circuit is controlled. A defrosting operation is performed (S2). Here, for example, the state of frost attached to the heat source side heat exchanger 16 may be determined by a sensor or the like, and the start of the defrosting operation may be determined based on the determination. Here, the control device 50 adjusts so that the two refrigerant circuits do not perform the defrosting operation at the same time. In the present embodiment, the defrosting operation is performed assuming that the refrigerant circuit A has reached a predetermined time, and the hot water supply operation is continuously performed in the refrigerant circuit B.

  FIG. 5 is a diagram illustrating a temperature change in the heat exchanger during the defrosting operation. The temperature shown in FIG. 5 represents the temperature detected by the temperature sensor 15 (the temperature of the refrigerant on the side from which the hot gas flowing into the heat source side heat exchanger 16 flows out, hereinafter referred to as the heat exchanger outlet temperature).

  For example, in the temperature raising stage A shown in FIG. 5B, hot gas is passed through the heat source side heat exchanger 16 to thereby pass a predetermined temperature (basically around the melting point of frost (freezing point; about 0 ° C.)). Until the heat exchanger outlet temperature rises. In the frost and ice melting stage B, heat exchange between the hot gas and frost stabilizes the amount of heat supplied to the frost, so that the heat exchanger outlet temperature is constant at a predetermined temperature. Until the above stage, even if the ambient atmosphere of the heat source side heat exchanger 16 is stirred by the frost covering the heat source side heat exchanger 16, the defrosting operation is hardly affected.

  In the heat exchanger overheating stage C, most of the frost melts and drops as dew, and the heat source side heat exchanger 16 where the fins and the like are exposed comes into direct contact with the ambient atmosphere. At this time, if the ambient atmosphere is agitated, the amount of heat of the hot gas is deprived by the air involved in the agitation, and the temperature increase rate of the heat source side heat exchanger 16 becomes slow. For this reason, like interference (small), the time until the controller 50 determines that the heat exchanger outlet temperature has reached the defrosting end detection temperature becomes longer. Depending on the case, there is a possibility that the defrosting operation must be ended in a state where the defrosting end detection temperature is not reached (a state where the defrosting is not completed) as in the case of interference (large).

  Therefore, the control device 50 determines whether or not the frost and ice melting stage B has been completed and transitioned to the heat exchanger overheating stage C based on the temperature signal from the temperature sensor 15A (S3). If it is determined that the transition has been made, next, a determination related to the refrigerant circuit B performing the hot water supply operation is performed.

  In the present embodiment, this is not necessary because the control device 50 controls the operation of the refrigerant circuit A and the refrigerant circuit B. For example, when a device or unit having a heat exchange unit is installed, for example. The control device 50 sends a signal indicating that the defrosting operation is being performed via the inter-unit communication line 60. And in the heat exchange unit performing the hot water supply operation, in some cases, when a signal is received, it is determined whether the heat source side heat exchanger 16 related to defrosting is adjacent to or close to the heat source unit, and suppression control is performed. It may be determined whether or not.

  FIG. 6 is a diagram showing the relationship between operation time and ability. FIG. 6 shows the relationship between the operation time when the hot water supply operation is started from the state where the defrosting operation is finished and the frost is not formed, and the heating ability to water. As shown in FIG. 6, the longer the operation time, the greater the amount of frost that accumulates on the heat source side heat exchanger 16, so the air path resistance against the air that is about to pass through the heat source side heat exchanger 16 increases and the air volume. Will be reduced. Therefore, the control device 50 determines whether or not the refrigerant circuit B performing the hot water supply operation has been operated for 3/4 or more of the predetermined time (S12). If it is determined that the operation for 3/4 or more of the predetermined time is being performed, the hot water supply operation is continued without changing the control, assuming that the air volume has already decreased due to frost formation. On the other hand, if it is determined that the operation time is not 3/4 or more of the predetermined time (less than 3/4), the suppression control for controlling the rotational speed of the variable blower 17B is performed (S13). By this control, the temperature related to the detection by the temperature sensor 15A reaches the defrosting end detection temperature more quickly so that the interference of wind with the heat source side heat exchanger 16 related to defrosting is reduced (defrosting is completed). )

  Then, based on the temperature signal from the temperature sensor 15A that detects the heat exchanger outlet temperature of the heat source side heat exchanger 16A, the control device 50 determines that the defrosting end detection temperature has been reached, and switches between the four directions. The refrigerant circuit A is caused to end the defrosting operation by switching the valve 12A or the like (S4). Furthermore, with respect to the refrigerant circuit B, the suppression control is canceled, and the normal hot water supply operation is performed by changing the rotational speed of the variable blower 17B (S14). Further, for example, when another heat exchange unit is installed, the control device 50 sends a signal indicating that the defrosting operation has ended via the inter-unit communication line 60. Here, when the suppression control is not performed, the release process is not performed.

  As described above, in the hot water supply unit 100 according to Embodiment 1, when a plurality of refrigerant circuits perform alternate defrosting in cooperation, the hot water supply operation is performed adjacent to the refrigerant circuit performing the defrosting operation. In the refrigerant circuit, when the heat exchanger overheats stage C, the rotational speed of the variable blower 17 related to the hot water supply operation is changed to suppress the air volume (for example, about 70% of the normal hot water supply operation), and the defrosting operation is performed. Since the ambient atmosphere around the heat source side heat exchanger 16 of the refrigerant circuit is prevented from diffusing, the defrosting operation can be finished quickly and a normal hot water supply operation can be performed. For this reason, the efficient operation | movement can be performed as the whole apparatus.

  For example, like the hot water supply unit 100 of Embodiment 1, aiming at space saving, even if it installs so that the some housing | casing 200 may adjoin, alternate defrost can be performed efficiently. Further, it is possible to save time and effort for preparing a member such as a panel for shutting off the wind by the variable blower 17 related to another refrigerant circuit, and for performing installation work, thereby shortening the installation time and cost. .

  In addition, in the defrosting operation, when it is determined that the heat exchanger overheating stage C is greatly affected by the change in the ambient atmosphere, the control device 50 changes the rotational speed of the variable blower 17, so that the defrosting is performed. By shortening the time during which the suppression control is performed as much as possible while shortening the operation time of the operation, the operation efficiency of the refrigerant circuit performing the hot water supply operation can be maintained as much as possible.

  Here, for example, the casing 200 in the present embodiment has a structure in which air that has passed through the heat source side heat exchanger 16 is blown upward (upward blowing) by driving the variable blower 17. However, this is particularly effective for a heat exchange unit having a structure in which air is blown out in the lateral direction in which the ambient atmosphere of the other heat source side heat exchanger 16 can be easily stirred.

Embodiment 2. FIG.
In the first embodiment described above, a case has been described in which two casings 200 are provided on the same base of the hot water supply unit 100, and each of the casings 200 accommodates equipment constituting an independent refrigerant circuit. However, the present invention is not limited to this form. A unit that includes three or more refrigerant circuits on the same frame and can perform alternate defrosting may be used. Further, for example, a single refrigerant circuit may be used, and the refrigerant circuit may include a plurality of heat source side heat exchangers 16 that require defrosting.

  Moreover, although the above-mentioned embodiment demonstrated the hot water supply unit 100 for heating water and supplying hot water, it is applicable also to the refrigerating air-conditioning apparatus etc. which perform alternate defrost, for example.

Embodiment 3 FIG.
In the first embodiment described above, the case where the alternate defrosting is performed between the two refrigerant circuits provided in the hot water supply unit 100 has been described. This can also be applied to the case where a plurality of hot water supply units 100 are provided.

  For example, the control device 50 of the hot water supply unit 100 having a refrigerant circuit that is to perform the defrosting operation transmits a defrosting operation start signal via the inter-unit communication line 60. Further, when the defrosting operation is ended, a defrosting operation end signal is transmitted. And the control apparatus 50 which received the defrost operation start signal performs suppression control based on the judgment which concerns on predetermined time as shown to S2 of FIG. Moreover, the control apparatus 50 which is performing suppression control performs control in normal hot water supply operation based on the defrost operation end signal.

  Here, instead of performing communication using the unit-to-unit communication line 60 that is wired, the units may be wirelessly communicated. Wired communication has high communication reliability. On the other hand, by using wireless communication, a heat exchange unit in a range where signal communication can be performed can be regarded as an adjacent unit. For this reason, it becomes unnecessary to judge whether the heat exchange unit which concerns on a defrost is approaching, for example.

Embodiment 4 FIG.
In the above-described embodiment, the hot water supply unit 100 is described in which each device constituting the refrigerant circuit is accommodated in one housing 200 and applied to the hot water supply device, but the present invention is not limited to this. For example, the same effect can be obtained even in a separate type apparatus such as a refrigeration air conditioner separated from the heat source side heat exchanger 16 by using the load side heat exchanger 13 as a component device of another unit.

Embodiment 5 FIG.
In the above-mentioned embodiment, although the alternate defrosting which performs the defrosting operation of the heat exchanger which becomes an evaporator in each refrigerant circuit was demonstrated, it is not necessary to limit to this. For example, in a system in which a refrigeration apparatus is installed, when the heat source side heat exchanger 16 always functions as a condenser as in the refrigeration apparatus, it is not necessary to perform a defrosting operation. However, the efficiency of the entire system can be increased without lengthening the defrosting operation time, for example, by causing the other refrigerant circuit to perform the suppression control during the defrosting operation.

Embodiment 6 FIG.
Although the hot water supply unit 100 has been described in the above-described embodiment, for example, a unit (heat exchange unit) having a heat exchanger that needs to be defrosted, such as a unit cooler (load side device) that performs alternate defrosting, or the like. Can be applied.

  FIG. 7 is a diagram illustrating a configuration of a load side device 300 according to Embodiment 6 of the present invention. In FIG. 7, the same operation is performed for the devices having the same numbers as those in FIG. 2 and the like. Similarly to the variable blower 17, the load side variable blower 18 is driven to feed heat into the load side heat exchanger 13 in order to promote heat exchange between the refrigerant and the air in the load side heat exchanger 13. The load-side variable blower 18 changes the rotational frequency of the propeller fan by changing the drive frequency, for example, by an inverter circuit or the like based on the instruction signal from the centralized controller 51 via the blower control line 31. In the present embodiment, the temperature sensor 19 detects the temperature of the refrigerant that has passed through the load-side heat exchanger 13 during the defrosting operation, and transmits a temperature signal. A temperature signal related to detection by the temperature sensor 15 is sent to the centralized controller 51 via the temperature sensor transmission line 30.

  The centralized controller 51 controls each device constituting the load side device 300. Here, the centralized controller 51 can control the plurality of load-side devices 300. Further, for example, communication with another management device or the like can be performed via the host controller communication line 70. In the present embodiment, the same processing as that of the control device 50 in the first embodiment is performed, and when the heat exchanger superheat stage C is reached, the rotation speed of the load-side variable blower 18 is suppressed to a predetermined number or less, and a defrosting operation is performed. The ambient atmosphere of the load side device 300 is not diffused.

  In this manner, for example, even when alternate defrosting is performed in a plurality of load-side devices 300 installed in the same room, the defrosting operation can be finished quickly, and a normal operation can be performed. At this time, when it becomes the heat exchanger overheating stage C, by changing the rotation speed of the load side variable blower 18, the operating time of the defrosting operation is shortened and the efficiency in the normal operation is maintained. be able to.

Embodiment 7 FIG.
In the first embodiment described above, based on the temperature related to the detection of the temperature sensor 15, the control device 50 determines the stage in the heat source side heat exchanger 16 during the defrosting operation and determines the timing related to the suppression control. However, the present invention is not limited to this. For example, in the above-described embodiment, the rotational speed of the variable blower 17 is suppressed in the heat exchanger overheating stage C, but it is experimental that the transition from the frost ice melting stage B to the heat exchanger overheating stage C is performed. If it is obtained by calculation, the state of frost in the heat exchanger may be determined by, for example, timing by a timing means.

  In addition, an optical sensor or the like is provided on the heat source side heat exchanger 16 or the like, and the state of frost in the heat exchanger is determined based on the change in light intensity on the surface of the heat exchanger due to frost thickness, dew that the frost has melted, or the like. You may make it judge. Since the optical sensor can monitor the surface of the heat exchanger more directly by light, a signal is sent to the controller 50 when the temperature sensor 15 is no longer present (when air passes through the heat exchanger). Can send.

  In addition, for example, a switch that switches at a predetermined temperature and that generates a signal corresponding to the switch may be provided. For example, as shown in FIG. 6, in the heat exchanger superheating stage C, the melting of frost disappears, and the temperature in the heat exchanger rises. Therefore, the switching temperature in the temperature switch is set to 0 ° C., for example, and the control device 50 performs suppression control on the variable blower 17 of the refrigerant circuit that continues operation based on the signal from the temperature switch. Determine whether or not. By using the temperature switch, the defrosting stage can be detected at a lower cost than using a sensor or the like.

Embodiment 8 FIG.
FIG. 8 is a diagram showing an installation form of the heat exchange unit according to the eighth embodiment of the present invention. FIG. 8A shows the case of two heat exchange units on one gantry as in the first embodiment. Air is sucked from the side surface side of the housing 200 and blown out from the upper surface side.

  FIG. 8B shows the relationship among a plurality of heat exchange units as in the third embodiment. Moreover, FIG.8 (c) shows the relationship with the unit which does not need to perform a defrost like Embodiment 5. FIG. As described above, the same effect can be obtained even in a system in which a plurality of heat exchange units are installed in various forms.

Embodiment 9 FIG.
In the above-described embodiment, the control device 50 and the like have been described with respect to the variable blower 17 and the like that are located around the heat exchanger related to defrosting and performing the suppression control without any particular condition. In the present embodiment, the control device 50 can select whether or not to perform suppression control by performing learning or the like.

  For example, the control device 50 has a storage device (not shown), and stores in advance data relating the temperature range of the outside air temperature and the standard defrosting time. Then, for example, as shown in S1 of FIG. 4 and the like, the standard defrosting is performed based on the outside air temperature detected by a temperature sensor or the like (not shown) for detecting the outside air temperature when it is determined to perform the defrosting operation. Set the time.

  If it is determined that the defrosting operation has become longer than the standard defrosting time, at the next defrosting operation, for example, a signal indicating that the defrosting operation is being performed is sent, and the variable blower 17 related to the hot water supply operation is sent. And so on. On the other hand, if it is determined that the defrosting operation has been completed within the standard defrosting time, in the next defrosting operation, for example, a signal indicating that the defrosting operation is being performed is not sent to the hot water supply operation. The suppression control is not performed on the variable blower 17 and the like.

  By doing as mentioned above, operation efficiency can be raised as the whole apparatus (system) by not performing suppression control depending on the case by the defined standard defrost time.

  11, 11A, 11B Compressor, 12, 12A, 12B Four-way switching valve, 13, 13A, 13B Load side heat exchanger, 14, 14A, 14B Expansion valve, 15, 15A, 15B, 19 Temperature sensor, 16, 16A, 16B heat source side heat exchanger, 17, 17A, 17B variable blower, 18 load side variable blower, 30, 30A, 30B temperature sensor transmission line, 31, 31A, 31B blower control line, 50 control device, 51 centralized controller, 60 unit communication line, 70 host controller communication line, 100 hot water supply unit, 200, 200A, 200B housing, 300, 300A, 300B load side device.

Claims (11)

A heat exchanger for performing heat exchange between the refrigerant and air;
A blower forming a flow of air passing through the heat exchanger;
When it is determined that another heat exchanger is performing defrosting, the heat exchange unit includes a control device that performs suppression control to suppress the air volume of the blower.   The said control apparatus controls the said air blower so that it may become the output of 70% or less of the maximum output in the said suppression control, The heat exchange unit of Claim 1 characterized by the above-mentioned.   The heat control unit according to claim 1, wherein the control device performs the suppression control on a blower corresponding to the heat exchanger functioning as an evaporator. The control device has time measuring means,
When it is determined that the operation time after the last defrosting in the heat exchanger is over a predetermined time based on the time of the time measuring means, the suppression control is performed on the blower corresponding to the heat exchanger. The heat exchange unit according to any one of claims 1 to 3, wherein the heat exchange unit is not performed.   The said control apparatus will cancel | release the said suppression control, if it judges that the defrost in said other heat exchanger was complete | finished, The heat exchange unit in any one of Claims 1-4 characterized by the above-mentioned. An outside temperature sensor for detecting the temperature of the outside air;
The control device determines a standard defrosting time from data defining a relationship between the temperature of the outside air and the standard defrosting time based on the temperature of the outside air related to the detection by the outside air temperature sensor, and the time related to the defrosting is the standard time. The heat exchange unit according to any one of claims 1 to 5, wherein when it is determined that it is within the defrosting time, the suppression control is not performed in the next defrosting. Further comprising a frost detection device for detecting the state of frost attached to the heat exchanger;
The heat control unit according to claim 1, wherein the control device determines whether defrosting is performed based on detection of the detection device in the other heat exchanger. . The frost detector is
A temperature sensor that sends the temperature of the refrigerant that has passed through the heat exchanger as a signal at the time of defrosting, a temperature switch or a light emitting element that sends a signal when the temperature of the refrigerant that has passed through the heat exchanger at the time of defrosting reaches a predetermined temperature The heat exchange unit according to claim 7, wherein the heat exchange unit is at least one of optical sensors that send the intensity of reflected light on the surface of the heat exchanger as a signal.   The heat exchange unit according to any one of claims 1 to 8, wherein defrosting is alternately performed between a plurality of units.   The heat exchange unit according to any one of claims 1 to 9, wherein communication related to defrosting is performed wirelessly between a plurality of units. A compressor for compressing the refrigerant;
A condenser for condensing the refrigerant;
A decompression device for adjusting the pressure of the refrigerant;
The refrigeration cycle apparatus which comprises a refrigerant circuit by pipe-connecting the evaporator comprised with the heat exchanger which the heat exchange unit in any one of Claims 1-10 has.