WO2016103593A1

WO2016103593A1 - Cooling apparatus

Info

Publication number: WO2016103593A1
Application number: PCT/JP2015/006060
Authority: WO
Inventors: 将吾前田; 直之舟田; 弘仁堺; 雅史坪内; 雅史松井
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2014-12-25
Filing date: 2015-12-07
Publication date: 2016-06-30

Abstract

A cooling apparatus (10) is provided with a first heat exchanger (21), a second heat exchanger (22), a first blown air passage (13a), a second blown air passage (13b), and a switching part (28). In the first heat exchanger (21), heat is exchanged between first and second bodies of air via a countercurrent scheme. In the second heat exchanger (22), which comprises an evaporator (23), a condenser (24), and a compressor (25), heat is conveyed between the first and second bodies of air. The first blown air passage (13a) is an air passage via which the first body of air passes through the first heat exchanger (21). The second blown air passage (13b) is an air passage via which the first body of air bypasses the first heat exchanger (21). The switching part (28) changes the ratio between the amount of the first body of air in the first blown air passage (13a) and the amount of the first body of air in the second blown air passage (13b).

Description

Cooling system

The present invention relates to a cooling device that uses a first heat exchanger and a second heat exchanger in combination.

Conventionally, in a device or structure having a heat source in a housing or a room, a cooling device is provided to cool the inside air in the housing or the room. As such a cooling device, for example, one disclosed in Patent Document 1 is known.

The cooling device (server storage device having a cooling function) disclosed in Patent Document 1 is connected to a first air passage that circulates the inside air of a cooling target (heat source) and a duct that communicates with the outside to circulate outside air. A second air passage is provided in parallel. In addition, each air passage is provided with a blower that generates an air flow.

Next, an evaporator (evaporator) is provided in the first air passage, and a condenser (condenser) is provided in the second air passage. The evaporator, the condenser, the compressor (compressor), and the like constitute a refrigeration circuit. The refrigeration circuit absorbs heat of the internal air flowing through the first air passage by the evaporator, and performs exhaust heat corresponding to the heat absorption on the outside air flowing through the second air passage. In this way, the refrigeration circuit cools the inside air.

Furthermore, in the technique disclosed in Patent Document 1, a heat exchanger is used in combination to increase energy consumption efficiency. The heat exchanger is a counter flow system and is provided so as to straddle the first air passage and the second air passage. The heat exchanger is provided upstream of the evaporator of the first air passage and upstream of the condenser of the second air passage. The heat exchanger preliminarily absorbs the inside air by heat exchange action between the inside and outside air before the inside air reaches the evaporator. Thus, the cooling device has a configuration capable of cooling the inside air in two stages of the heat exchanger and the refrigeration circuit. That is, when the heat exchanger is a first heat exchanger and the refrigeration circuit is a second heat exchanger, the cooling device can cool the inside air in two stages, the first heat exchanger and the second heat exchanger. It has become a structure.

Incidentally, the first heat exchanger is a mechanism that cools the inside air by absorbing heat of the inside air by heat exchange action between the inside and outside air when the outside air temperature is lower than the inside air temperature. However, in an environment where the outside air temperature is higher than the inside air temperature, the heat exchange action between the inside and outside air is reversed due to the mechanism of the first heat exchanger, and the inside air is heated by the first heat exchanger. End up. In the evaporator on the downstream side, the inside air heated by the first heat exchanger is cooled, so that a part of the cooling action by the evaporator is offset. That is, in the whole cooling device, the heat exchange becomes inefficient due to the combined use of the first heat exchanger and the second heat exchanger. Therefore, a means for avoiding such a situation is necessary.

JP 2010-160533 A

An object of the present invention is to provide a cooling device capable of suppressing the reverse heat exchange between the inside and outside air in the first heat exchanger and stabilizing the cooling capacity.

The cooling device of the present invention includes a first heat exchanger, a second heat exchanger, a first air passage, a second air passage, and a switching unit. The first heat exchanger performs heat exchange between the first and second air by a counter flow method. A 2nd heat exchanger consists of an evaporator, a condenser, and a compressor, and heat-transfers between 1st and 2nd air. The first air passage is an air passage through which the first air passes through the first heat exchanger. The second air passage is an air passage for the first air to bypass the first heat exchanger. The switching unit changes the ratio between the air volume of the first air in the first air duct and the air volume of the first air in the second air duct.

According to the cooling device of the present invention, it is possible to suppress the reverse heat exchange between the inside and outside air in the first heat exchanger, and to stabilize the cooling capacity.

3 is a configuration diagram of a cooling device in Embodiment 1. FIG. FIG. 3 is a perspective view of the cooling device in the first embodiment. 2 is a functional block diagram showing a functional configuration of a cooling device in Embodiment 1. FIG. 3 is a flowchart for each cooling mode of the cooling device in the first embodiment. 3 is a diagram illustrating a cooling device in a cooling mode by a first heat exchanger according to Embodiment 1. FIG. It is a figure explaining the cooling device in the cooling mode by the 2nd heat exchanger in Embodiment 1. FIG. FIG. 5 is a configuration diagram of a cooling device in a second embodiment. FIG. 5 is a configuration diagram of a cooling device in a second embodiment.

The cooling device according to the present invention will be described.

(Embodiment 1)
Hereinafter, the cooling device according to Embodiment 1 will be described.

As shown in FIGS. 1 and 2, the cooling device 10 is a device that cools a cooling target A having a heat source, for example, in a storage battery chamber that houses a large number of storage batteries serving as heat sources. The cooling device 10 is attached to the outer wall of the storage battery chamber, which is the object A to be cooled, in the number and arrangement considering the size of the storage battery chamber. The cooling device 10 introduces the inside air of the storage battery chamber into the device through a through-hole provided in the outer wall of the storage battery chamber, cools the inside air, and supplies it again into the storage battery chamber.

The casing 11 of the cooling device 10 has, for example, a square box shape, and the mounting surface 12 attached to the cooling target A is provided with an inside air inlet 12a on the upper side in the mounting posture shown in FIG. Yes. The mounting surface 12 is provided with an inside air discharge port 12b at a position spaced below the inside air introduction port 12a. Inside the housing 11, an inside air blowing path 13 is provided so as to communicate the inside air introduction port 12 a and the inside air discharge port 12 b. The inside air from the cooling target A is introduced into the inside air blowing path 13 from the inside air introduction port 12a. The low-temperature inside air cooled by passing through the inside air blowing path 13 is discharged to the cooling object A from the inside air discharge port 12b.

Further, an outside air introduction port 15a is provided on the lower side of the outer surface 15 of the housing 11 opposite to the mounting surface 12. On the outer side surface 15, an outside air discharge port 15 b is provided at a position spaced above the outside air introduction port 15 a. The outside air introduction port 15a is provided below the inside air discharge port 12b, and the outside air discharge port 15b is provided above the inside air discharge port 12b and below the inside air introduction port 12a. Inside the housing 11, an outside air blowing path 16 is provided so that the outside air introduction port 15 a and the outside air discharge port 15 b communicate with each other. Outside air around the cooling device 10 is introduced into the outside air blowing path 16 from the outside air introduction port 15a. The high temperature outside air that has been overheated by passing through the outside air blowing passage 16, that is, the high temperature outside air that has been heated by exhaust heat when cooling the inside air is discharged to the outside from the outside air discharge port 15b.

Inside the housing 11, a first heat exchanger (heat exchange element) 21 and a second heat exchanger (refrigeration circuit) 22 are provided as means for cooling the inside air. The first heat exchanger 21 is a counter flow system, and is a device that exchanges heat between the inside and outside air without mutual circulation of the inside and outside air. The second heat exchanger 22 includes an evaporator (evaporator) 23, a condenser (condenser) 24, and a compressor (compressor) 25, and a pipe (both not shown) that connects them and circulates the refrigerant. Heat transfer between. Further, inside the housing 11, an inside air blower 26 that generates an inside air flow in the inside air blowing path 13 and an outside air blower 27 that generates an outside air flow in the outside air blowing path 16 are provided. A control unit 29 is provided on the downstream side of the inside air blower 26 in the inside air blowing path 13.

In the inside air blowing path 13, an inside air blower 26 is arranged in the vicinity of the inside air introduction port 12a, and then a control unit 29 and an inside air temperature detecting unit 17 constituting the control device 14 are arranged. On the downstream side thereafter, two air passages, that is, the inside air first air passage 13a and the inside air second air passage 13b are provided in parallel.

The switching unit 28 switches the ratio between the amount of the internal air flowing through the inside air first air passage 13a and the amount of the internal air flowing through the internal air second air passage 13b. The switching part 28 of this Embodiment is comprised by the switching member which switches the flow of inside air between the inside air 1st ventilation path 13a and the inside air 2nd ventilation path 13b.

In the inside air first air passage 13, the first heat exchanger 21 is disposed on the inside air first air passage 13a side, the switching unit 28 is provided on the inside air second air passage 13b side, and the evaporator 23 is provided on the downstream side thereof. Has been placed. That is, the inside air passes through the first heat exchanger 21 by the inside air first air passage 13a and bypasses the first heat exchanger 21 by the inside air second air passage 13b.

The switching unit 28 is provided with, for example, an opening / closing member that is provided alongside the inlet of the air passage for the inside air in the first heat exchanger 21 and opens and closes the inlet of the inside air second air passage 13b. That is, the switching unit 28 is configured using the opening / closing member as the switching member. The switching unit 28 switches the flow of the inside air in accordance with an instruction from the control unit 29 according to the detected temperatures of the inside air temperature detecting unit 17 and the outside air temperature detecting unit 18.

That is, the switching unit 28 closes the inlet of the inside air second air passage 13b to guide the inside air that has passed through the inside air blower 26 to the inside air first air passage 13a side. The switching unit 28 opens the inlet of the inside air second air passage 13b to guide the inside air that has passed through the inside air blower 26 toward the inside air second air passage 13b. Note that the pressure loss of the inside air first air passage 13a including the first heat exchanger 21 (hereinafter simply referred to as “pressure loss”. Alternatively, the flow path resistance may be used instead of the pressure loss). Is relatively sufficiently larger than the pressure loss of the inside air second air passage 13b. Therefore, the inlet of the air path for the inside air of the first heat exchanger 21 is left open and no opening / closing member is provided. By adopting this configuration, the flow of the inside air when the inlet of the inside air second air passage 13b is opened by the switching unit 28 is mainly switched to the inside air second air passage 13b on the side where the pressure loss is small.

On the other hand, in the outside air blowing path 16, the outside air blower 27 and the outside air temperature detecting unit 18 are arranged in the vicinity of the outside air introduction port 15a, and then the first heat exchanger 21 is arranged. Further, a capacitor 24 is disposed in the vicinity of the outside air discharge port 15b. When the outside air blower 27 performs the air blowing operation, the outside air temperature detection unit 18 detects the outside air temperature introduced from the outside air introduction port 15a. The rotational speed of the outside air blower 27 is controlled in accordance with an instruction from the control unit 29 according to the detected temperatures of the inside air temperature detecting unit 17 and the outside air temperature detecting unit 18. The outside air blown by the outside air blower 27 passes through the first heat exchanger 21, then passes through the condenser 24, and is exhausted to the outside from the outside air discharge port 15b.

FIG. 2 shows a case where there are a plurality of second heat exchangers 22.

The second heat exchanger 22a includes an evaporator 23a, a condenser 24a, and a compressor 25a, and a pipe (both not shown) that connects them to circulate the refrigerant. The second heat exchanger 22b includes an evaporator 23b, a condenser 24b, and a compressor 25b, and piping (both not shown) that connects them to circulate the refrigerant.

Next, the configuration of the control device 14 will be described.

As shown in FIG. 3, the control device 14 includes an inside air temperature detection unit 17, an outside air temperature detection unit 18, a control unit 29, a display unit 30, and a communication unit 31. The inside air temperature detection unit 17 detects the inside air temperature, and the outside air temperature detection unit 18 detects the outside air temperature. Based on the inside air temperature detected by the inside air temperature detecting unit 17 and the outside air temperature detected by the outside air temperature detecting unit 18, the control unit 29 includes a second heat exchanger 22, an inside air blower 26, an outside air blower 27, The switching unit 28 is controlled. The display unit 30 receives the signal from the control unit 29 and displays the operation state. The communication unit 31 receives a signal from the control unit 29 and communicates with the outside.

In this configuration, temperature information detected by at least one of the inside air temperature detection unit 17 and the outside air temperature detection unit 18 is input to the control unit 29. The control unit 29 determines the cooling mode based on the temperature information. Further, the control unit 29 outputs control information to the inside air blower 26, the outside air blower 27, the switching unit 28, and the compressor 25.

The display unit 30 receives a cooling mode signal determined based on the temperature information detected by the inside air temperature detection unit 17 or the outside air temperature detection unit 18 from the control unit 29, and displays the operation state and the operation ratio of the compressor 25. To do. This display allows the user to feel energy saving.

Further, the communication unit 31 receives the cooling mode signal determined from the temperature information from the control unit 29, and outputs, for example, a cooling mode, power consumption, and an abnormal state signal to the external device. Thus, the external device can visualize the operation state of the cooling device 10 and the control device 14 can exchange information with the device in the cooling target A.

Hereinafter, the state of each cooling mode in the cooling device 10 will be described based on the flowchart shown in FIG. In FIG. 4, Tr is the inside air temperature (° C.) detected by the inside air temperature detector 17, Ta is the outside air temperature (° C.) detected by the outside air temperature detector 18, and ΔT is a value obtained by subtracting Ta from Tr. (° C.).

The cooling device 10 performs the following processing.

[Preliminary operation]
First, the preliminary operation (sampling operation) until each cooling mode to be described later is selected will be described.

As shown in FIG. 4, energization of the cooling device 10 is started in step S1. Next, in step S2, after the switching unit 28 is fully closed, the inside air blower 26 and the outside air blower 27 are operated for 1 minute, for example, at a rotation speed of 50% of the maximum rotation speed. That is, a sampling operation is performed. In step S3, the temperatures detected by the inside air temperature detector 17 and the outside air temperature detector 18 are sampled.

In the subsequent step M1, a determination is made based on the temperature sampled in step S3. When the sampled Tr is 25 ° C. or lower, it is determined that cooling of the cooling target A is unnecessary because the temperature is low, and the path from step M1 to step S4 is selected. That is, if the cooling target A is a storage battery chamber, it is determined that power storage is not performed, and cooling is not performed.

In step S4, the inside air blower 26 and the outside air blower 27 are stopped. Then, after a predetermined time, for example, after 10 minutes, the process returns to step S2.

The cooling device 10 repeats the cycle of steps S2, S3, M1, and S4 until the inside air temperature exceeds 25 ° C.

Next, a case where Tr is higher than a predetermined temperature range will be described. This case will be described later in detail.

In step M1, when the sampled Tr is 45 ° C. or higher, the inside air cooling mode at the time of high temperature abnormality described later is selected. That is, in this case, it is determined that the temperature is abnormal, and the route from step M1 to step M42 is selected. Hereinafter, the inside air cooling mode when the high temperature is abnormal is referred to as a high temperature abnormal mode.

In step M42, when the sampled Ta exceeds 10 ° C., the second heat exchanger 22 is used, and the inside air blower 26 and the outside air blower 27 are operated at the maximum rotation speed (strong blower operation), and the temperature is quickly increased. Reduce. On the other hand, when Ta is 10 ° C. or lower, by using the first heat exchanger 21 without using the second heat exchanger 22, the temperature can be quickly reduced with energy saving.

After using the second heat exchanger 22 or the first heat exchanger 21 in step M42, temperature sampling is performed again in the subsequent step M43. Next, in step M44, this high temperature abnormality mode is continuously selected until Tr becomes 40 ° C. or lower. That is, the process returns from step M44 to step M42. Thus, the cycle of steps M42, M43 and M44 is repeated when the temperature is abnormal. When Tr becomes 40 ° C. or lower, the process returns from step M44 to step S3.

[First heat exchanger mode]
As shown in FIG. 4, in step M1, the cooling mode is selected based on the temperature sampled in step S3.

In Step M1, when Tr is over 25 ° C., less than 45 ° C., and ΔT is 20 ° C. or more, the inside air cooling mode using only the first heat exchanger 21 is selected. That is, it is determined that cooling with only the outside air is possible, and the path from step M1 to step M11 is selected. Hereinafter, the inside air cooling mode using only the first heat exchanger 21 is referred to as a first heat exchanger mode.

In subsequent step M11, the switching unit 28 is fully closed, and in step M12, the cooling operation in the first heat exchanger mode is performed.

Next, in step M13, temperature sampling is performed again. In subsequent step M14, a determination is made to select the next step based on the sampled temperature.

In step M14, if the sampled Tr is 45 ° C. or higher, it is determined that the temperature is abnormal, and the process proceeds to step M42.

Further, when Tr is 20 ° C. or lower, it is determined that cooling of the cooling target A is unnecessary because the temperature is low, and the process returns to step S4. In step S4, the inside air blower 26 and the outside air blower 27 are stopped.

When Tr exceeds 25 ° C. and is lower than 45 ° C., and Tr is 30 ° C. or higher or ΔT is 15 ° C. or lower, the process returns to step S3.

When Tr exceeds 25 ° C. and less than 45 ° C., and when Tr is less than 30 ° C. and ΔT exceeds 15 ° C., the first heat exchanger mode is continuously selected. That is, in the case of this temperature condition, the process returns from step M14 to step M12.

Next, the operation in the first heat exchanger mode will be described with reference to FIG. In the first heat exchanger mode, the inside air blower 26 and the outside air blower 27 perform the air blowing operation, while the second heat exchanger 22 does not perform the operation and is stopped. The switching unit 28 closes the inlet of the inside air second air passage 13b.

By the blowing operation of the inside air blower 26, the inside air flows through the inside air first air passage 13a and passes through the inside air air passage of the first heat exchanger 21. Further, the outside air flows through the outside air blowing path 16 by the blowing operation of the outside air blower 27, and passes through the outside air blowing path of the first heat exchanger 21. Thus, the first heat exchanger 21 absorbs the inside air and exhausts heat from the outside air, and the cooled inside air is supplied to the cooling target A.

[Combination mode]
As shown in FIG. 4, in step M1, when Tr is more than 25 ° C. and less than 45 ° C. and ΔT is 10 ° C. or more and less than 20 ° C., the first heat exchanger 21 and the second heat exchanger 22 Select the inside air cooling mode that uses. That is, it is determined that the cooling using the outside air is possible, and the route from step M1 to step M21 is selected. Hereinafter, the inside air cooling mode in which the first heat exchanger 21 and the second heat exchanger 22 are used together is referred to as a combined mode.

Next, in step M21, the switching unit 28 is half-opened, and in step M22, the cooling operation in the combined mode is performed.

In subsequent step M23, temperature sampling is performed again. Further, in step M24, a determination is made to select the next step based on the sampled temperature.

In step M24, if the sampled Tr is 45 ° C. or higher, it is determined that the temperature is abnormal, and the process proceeds to step M42.

Further, when Tr is 20 ° C. or lower, it is determined that cooling of the cooling target A is unnecessary because the temperature is low, and the process returns to step S4.

When Tr is over 25 ° C. and below 45 ° C., and Tr is 35 ° C. or higher or ΔT is 23 ° C. or higher, the process returns to Step S3. That is, when Tr becomes 35 ° C. or higher, it is determined that the cooling capacity is insufficient, and the process returns to step S3. Furthermore, the inside air cooling mode by the 2nd heat exchanger 22 mentioned later is selected by selection of the cooling mode in step M1. If ΔT is 23 ° C. or higher, it is determined that cooling can be performed only by the first heat exchanger using the outside air with higher energy consumption efficiency, and the process returns to step S3. Further, the first heat exchanger mode is selected in the selection of the cooling mode in step M1.

When Tr is over 25 ° C. and below 45 ° C., and Tr is below 35 ° C. and ΔT is below 23 ° C., the combined mode is continuously selected. That is, in the case of this temperature condition, the process returns from step M24 to step M22.

Next, the operation in the combined mode will be described with reference to FIG. In the combined mode, the inside air blower 26 and the outside air blower 27 perform a blowing operation, and the second heat exchanger 22 performs a cooling operation. The switching part 28 makes the entrance of the inside air 2nd ventilation path 13b a half-open state (predetermined amount open state).

The inside air is cooled by the first heat exchanger 21 in one inside air first air passage 13a by the air blowing operation in the inside air blower 26 and the outside air blower 27 and by the half-opening of the inlet in the switching unit 28. In the other inside air second air passage 13 b, the inside air is cooled by passing through the evaporator 23. In this manner, the inside air is suitably cooled in each air passage, and the cooled inside air is supplied to the cooling target A.

In the air path on the outside air side, the exhaust heat from the first heat exchanger 21 and the exhaust heat from the condenser 24 are further made.

When the second heat exchanger 22 is used in the combined mode or the like, for example, when there are a plurality of second heat exchangers 22 as shown in FIG. 2, control is performed so that the operation is not concentrated on one compressor. May be. Specifically, after one compressor 25a is operated for a certain period of time, the other compressor 25b is operated in accordance with an instruction from the control device 14. In this way, it is possible to control the operation times of the

compressors

25a and 25b to be equal. As a result, the operating time of each of the

compressors

25a and 25b is half that in the case of using one compressor, the life of the cooling device 10 is extended, and the effect of saving maintenance is achieved.

[Second heat exchanger mode (refrigeration circuit mode)]
As shown in FIG. 4, in step M1, when Tr exceeds 25 ° C. and less than 45 ° C., and ΔT is less than 10 ° C., the inside air cooling mode using only the second heat exchanger 22 is selected. That is, it is determined that the cooling in the first heat exchanger using the outside air is inefficient, and the path from step M1 to step M31 is selected. Hereinafter, the inside air cooling mode using only the second heat exchanger 22 is referred to as a second heat exchanger mode (refrigeration circuit mode).

Next, in step M31, the switching unit 28 is fully opened, and in step M32, the cooling operation in the second heat exchanger mode is performed.

In subsequent step M33, temperature sampling is performed again. Further, in step M34, a determination for selecting the next step is performed based on the sampled temperature.

In step M34, if the sampled Tr is 45 ° C. or higher, it is determined that the temperature is abnormal, and the process proceeds to step M42.

When the Tr exceeds 25 ° C. and less than 45 ° C., and the Ta is less than 15 ° C., the second heat exchanger mode is continuously selected. That is, when Ta is 15 ° C. or higher, the process returns from step M34 to step M32.

When Tr exceeds 25 ° C. and is lower than 45 ° C., and Ta is lower than 15 ° C., it is determined that the first heat exchanger 21 can be cooled with outside air, and the process returns to step S3. . Further, in the selection of the cooling mode in step M1, a route to either the combined mode or the first heat exchanger mode is selected based on the value of ΔT.

Next, the operation in the second heat exchanger mode will be described with reference to FIG. The second heat exchanger mode is selected when the temperature environment of the first heat exchanger mode and the combination mode is opposite. That is, the second heat exchanger mode is used when the inside air temperature exceeds, for example, 25 ° C., the outside air temperature is high, and ΔT is small. In the case of this temperature condition, the inside air is cooled only by the second heat exchanger 22. That is, the heat exchange action in the first heat exchanger 21 is suppressed so that the reverse heat exchange between the inside and outside air is not performed in the first heat exchanger 21.

In the second heat exchanger mode, the inside air blower 26 and the outside air blower 27 perform a blowing operation, and the second heat exchanger 22 performs a cooling operation. Moreover, the switching part 28 switches the entrance of the inside air 2nd ventilation path 13b to an open state.

When the inlet of the inside air second air passage 13b is opened by the switching unit 28, the main flow of the inside air is switched to the inside air second air passage 13b side. By this switching, the supply of the internal air to the first heat exchanger 21 in the internal air first air passage 13a is sufficiently reduced, so that the heat exchange action in the first heat exchanger 21 is sufficiently suppressed. That is, the function as the first heat exchanger 21 is suppressed. In this way, since the inside air does not pass through the first heat exchanger 21 and bypasses the first heat exchanger 21, it is possible to sufficiently suppress the inside air from being heated in reverse by the outside air.

Since the main flow of the inside air in the second heat exchanger mode is the inside air second air passage 13b side, the inside air is cooled by passing through the evaporator 23, and the cooled inside air is supplied to the cooling target A. . The outside air in the second heat exchanger mode passes through the condenser 24 after passing through the first heat exchanger 21. Therefore, the exhaust heat from the condenser 24 is carried on the outside air flow.

[High temperature abnormal mode]
The high temperature abnormality mode described in the description of the preliminary operation will be described in detail.

The high temperature abnormality mode is applied when the temperature of the cooling target A is higher than a predetermined temperature range, for example, when the inside air temperature is 45 ° C. or higher (high temperature abnormality).

When the outside air temperature is not low (for example, higher than 10 ° C.), the inside air blower 26 and the outside air blower 27 are operated at a specified maximum rotational speed with the same configuration as in the second heat exchanger mode.

On the other hand, when the outside air temperature is low (for example, 10 ° C. or lower), the inside air blower 26 and the outside air blower 27 are operated at a specified maximum rotational speed with the same configuration as in the first heat exchanger mode. Thereby, the cooling target A is quickly cooled to a predetermined temperature region. When entering the high temperature abnormality mode, the display unit 30 that notifies the device in the cooling target A of an abnormal state through the communication unit 31 or displays a driving state in response to a signal from the control unit 29. An abnormal state can be displayed on the monitor. Thereby, it can utilize as a means to notify the abnormal state of the cooling target A.

In addition, you may switch each said cooling mode by a user operating the mode change switch etc. which were provided in the cooling device 10. FIG.

In addition, it is not appropriate that the cooling mode is frequently switched by re-sampling and selecting the cooling mode after the transition to each cooling mode. Therefore, frequent switching of the cooling mode may be suppressed by setting the temperature differential (difference) at the time of switching the cooling mode with a width (for example, setting at 3 to 5 ° C. or the like).

Although not described in detail, in each cooling mode, the rotation speeds of the inside air blower 26 and the outside air blower 27 are controlled according to the sampled temperature. Thereby, energy consumption efficiency improves.

Thus, according to the cooling device 10 according to the present invention, the operating states of the first heat exchanger 21, the second heat exchanger 22, the inside air blower 26, and the outside air blower 27 are set to the detected temperatures. Based on this, it can be constantly monitored and appropriately controlled. Thereby, it is possible to suppress reverse heat exchange between the inside and outside air in the first heat exchanger 21 and to stabilize the cooling capacity. Furthermore, the maximum cooling capacity can be obtained with the minimum input energy, and energy saving can be achieved.

In this example, the temperatures are as follows: Tr is 20 ° C., 25 ° C., 30 ° C., 35 ° C., 40 ° C., 45 ° C., Ta is 10 ° C., 15 ° C., ΔT is 10 ° C., 15 ° C., 20 ° C., 23 The temperature was exemplified. However, each temperature may be considered as a predetermined temperature. That is, if Tr is 20 ° C., 25 ° C., 30 ° C., 35 ° C., 40 ° C., and 45 ° C., respectively, the predetermined temperatures Tr ₁ , Tr ₂ , Tr ₃ , Tr ₄ , Tr ₅ , Tr ₆ , Tr ₁ <Tr ₂ If <Tr ₃ <Tr ₄ <Tr ₅ <Tr ₆ is satisfied, and Ta 10 ° C. and 15 ° C. are the predetermined temperatures Ta ₁ and Ta ₂ , then Ta ₁ <Ta ₂ is satisfied, and ΔT is 10 ° C. If 15 ° C., 20 ° C., and 23 ° C. are the predetermined temperatures ΔT ₁ , ΔT ₂ , ΔT ₃ , and ΔT ₄ , then ΔT ₁ <ΔT ₂ <ΔT ₃ <ΔT ₄ is established. The magnitude relationship among Tr ₁ to Tr ₆ , Ta ₁ to Ta _2, and ΔT ₁ to ΔT ₄ can also be derived from the above example. However, these magnitude relationships are also examples.

The first heat exchanger 21 is exemplified as a heat exchange element, but may be other than the heat exchange element. For example, the first heat exchanger 21 may be a counter-flow type heat exchanger (such as a thermosiphon) having an evaporator and a condenser without having a compressor.

(Embodiment 2)
Hereinafter, the cooling device in Embodiment 2 will be described.

The cooling device in the second embodiment is different from the cooling device in the first embodiment in that the switching unit 28 is provided in the outside air path.

As shown in FIG. 7, the cooling device 10 is a device that cools a cooling object A having a heat source, for example, a storage battery chamber that houses a large number of storage batteries serving as heat sources. The cooling device 10 is attached to the outer wall of the storage battery chamber, which is the object A to be cooled, in the number and arrangement considering the size of the storage battery chamber. The cooling device 10 introduces the inside air of the storage battery chamber into the device through a through-hole provided in the outer wall of the storage battery chamber, cools the inside air, and supplies it again into the storage battery chamber.

The casing 11 of the cooling device 10 has, for example, a square box shape, and the attachment surface 12 attached to the cooling target A is provided with an inside air inlet 12a on the upper side in the attachment posture shown in FIG. Yes. The mounting surface 12 is provided with an inside air discharge port 12b at a position spaced below the inside air introduction port 12a. Inside the housing 11, an inside air blowing path 13 is provided so as to communicate the inside air introduction port 12 a and the inside air discharge port 12 b. The inside air from the cooling target A is introduced into the inside air blowing path 13 from the inside air introduction port 12a. The low-temperature inside air cooled by passing through the inside air blowing path 13 is discharged to the cooling object A from the inside air discharge port 12b.

Further, an outside air introduction port 15a is provided on the lower side of the outer surface 15 of the housing 11 opposite to the mounting surface 12. The outer side surface 15 is provided with an outside air discharge port 15b at a position spaced above the outside air introduction port 15a. The outside air introduction port 15a is provided below the inside air discharge port 12b, and the outside air discharge port 15b is provided above the inside air discharge port 12b and below the inside air introduction port 12a. Inside the housing 11, an outside air blowing path 16 is provided so that the outside air introduction port 15 a and the outside air discharge port 15 b communicate with each other. Outside air around the cooling device 10 is introduced into the outside air blowing path 16 from the outside air introduction port 15a. The high temperature outside air that has been overheated by passing through the outside air blowing passage 16, that is, the high temperature outside air that has been heated by exhaust heat when cooling the inside air is discharged to the outside from the outside air discharge port 15b.

Inside the housing 11, a first heat exchanger (heat exchange element) 21 and a second heat exchanger (refrigeration circuit) 22 are provided as means for cooling the inside air. The first heat exchanger 21 is a counter flow system, and is a device that exchanges heat between the inside and outside air without mutual circulation of the inside and outside air. The second heat exchanger 22 includes an evaporator (evaporator) 23, a condenser (condenser) 24, and a compressor (compressor) 25, and a pipe (both not shown) that connects them to circulate the refrigerant. The second heat exchanger 22 is a device that performs heat transfer between the inside and outside air. Further, inside the housing 11, an inside air blower 26 that generates an inside air flow in the inside air blowing path 13 and an outside air blower 27 that generates an outside air flow in the outside air blowing path 16 are provided.

In the inside air blowing path 13, an inside air blower 26 is arranged in the vicinity of the inside air introduction port 12a, then the first heat exchanger 21 is arranged, and an evaporator 23 is arranged in the vicinity of the inside air discharge port 12b. That is, when the inside air blower 26 performs a blowing operation, the inside air from the cooling target A introduced from the inside air introduction port 12a passes through the first heat exchanger 21, then passes through the evaporator 23, and passes through the inside air discharge port 12b. It is discharged to the cooling target A.

On the other hand, the outside air blowing path 16 includes an outside air blower 27 in the vicinity of the outside air introduction port 15a. On the downstream side thereafter, there are two blowing paths, that is, the outside air first blowing path 16a and the outside air second blowing path 16b. It is provided in parallel.

The switching unit 28 switches the ratio between the air volume of the outside air flowing through the first outside air passage 16a and the air volume of the outside air flowing through the second outside air passage 16b. The switching part 28 of this Embodiment is comprised by the switching member which switches the flow of external air between the external air 1st ventilation path 16a and the external air 2nd ventilation path 16b.

In the outside air blowing path 16, a first heat exchanger 21 is disposed on the outside air first blowing path 16a side, a switching unit 28 is disposed on the outside air second blowing path 16b side, and a condenser 24 is disposed on the downstream side thereof. That is, the outside air passes through the first heat exchanger 21 by the outside air first air passage 16a, and bypasses the first heat exchanger 21 by the outside air second air passage 16b.

The switching unit 28 is provided side by side with the inlet of the air path for the outside air of the first heat exchanger 21, and is configured by an opening / closing member that opens and closes the inlet of the outside air second air passage 16b, for example. That is, the switching unit 28 is configured by an opening / closing member as a switching member.

That is, the switching unit 28 closes the inlet of the outside air second air passage 16b to guide the outside air that has passed through the outside air blower 27 to the outside air first air passage 16a side. Further, the switching unit 28 opens the entrance of the second outside air passage 16b to guide the outside air that has passed through the outside air blower 27 toward the outside air second air passage 16b. In addition, the pressure loss (flow path resistance) of the outside air first air passage 16 a including the first heat exchanger 21 is relatively sufficiently larger than the pressure loss of the outside air second air passage 16 b including the capacitor 24. Therefore, the inlet of the air path for the outside air of the first heat exchanger 21 is left open and no opening / closing member is provided. With this configuration, the flow of outside air when the switching unit 28 opens the inlet of the outside air second air passage 16b is mainly switched to the outside air second air passage 16b on the side where the pressure loss is small.

Next, the operation (action) of the cooling device 10 will be described.

[First heat exchanger mode]
The first heat exchanger mode is used when the inside air temperature is higher than the outside air temperature, and the inside air is cooled only by the first heat exchanger 21. In the first heat exchanger mode, the inside air blower 26 and the outside air blower 27 are blown, while the operation of the second heat exchanger 22 is stopped. Further, the switching unit 28 closes the inlet of the outside air second air passage 16b.

By the blowing operation of the inside air blower 26, the inside air flows through the inside air blowing path 13 and passes through the inside air blowing path of the first heat exchanger 21. Further, by the air blowing operation of the outside air blower 27, outside air flows through the outside air blowing path 16 (in this case, the outside air first blowing path 16a side) and passes through the outside air blowing path of the first heat exchanger 21. As a result, the first heat exchanger 21 absorbs the inside air, exhausts heat from the outside air, and the cooled inside air is supplied to the cooling target A.

[Combination mode]
The combined mode is used when the inside air temperature is higher than the outside air temperature, and is a mode in which the inside air is sufficiently cooled by using the first heat exchanger 21 and the second heat exchanger 22 together. In the combined mode, the blowing operation of the inside air blower 26 and the outside air blower 27 and the cooling operation of the second heat exchanger 22 are performed. The switching unit 28 sets the entrance of the second outside air passage 16b to a half-open state (a predetermined amount of the open state).

By the blowing operation of the inside air blower 26 and the outside air blower 27, the inside air is cooled by the first heat exchanger 21 and further cooled by passing through the evaporator 23 downstream thereof, and the sufficiently cooled inside air is cooled. Supplied to subject A.

In the air path on the outside air side, exhaust heat from the first heat exchanger 21 and exhaust heat from the condenser 24 are performed. The switching portion 28 makes the outside air second air passage 16b semi-open (semi-closed) so that the outside air is distributed to each of the first and

second air passages

16a and 16b, and the first heat exchange is performed. The exhaust heat in the vessel 21 and the exhaust heat in the condenser 24 are preferably performed.

[Second heat exchanger mode (refrigeration circuit mode)]
The second heat exchanger mode (refrigeration circuit mode) is selected when the temperature environment in the first heat exchanger mode and the combined mode is opposite. That is, this mode is used when the inside air temperature is equal to or lower than the outside air temperature. In the case of this temperature condition, the inside air is cooled only by the second heat exchanger 22. That is, the heat exchange action in the first heat exchanger 21 is suppressed so that the reverse heat exchange between the inside and outside air is not performed in the first heat exchanger 21. In the second heat exchanger mode, the inside air blower 26 and the outside air blower 27 perform a blowing operation and a cooling operation of the second heat exchanger 22. Moreover, the switching part 28 switches the entrance of the external air 2nd ventilation path 16b to an open state.

The main flow of the outside air is switched to the outside air second air passage 16b side by opening the entrance of the outside air second air passage 16b by the switching unit 28. This switching sufficiently reduces the supply of outside air to the first heat exchanger 21 of the outside air first air passage 16a, so that the heat exchange action in the first heat exchanger 21 is sufficiently suppressed. That is, the function as the first heat exchanger 21 is suppressed. As described above, since the outside air bypasses the first heat exchanger without passing through the first heat exchanger 21, it is possible to sufficiently suppress the inside air from being heated in reverse by the outside air.

The inside air that has passed through the first heat exchanger 21 is cooled by passing through the evaporator 23, and the cooled inside air is supplied to the cooling target A. In addition, since the main flow of the outside air in the second heat exchanger mode is the outside air second air passage 16b side, the exhaust heat from the condenser 24 is carried on the outside air flow.

In addition, you may switch each said cooling mode by a user operating the mode change switch etc. which were provided in the cooling device 10. FIG. Further, the controller 29 of the cooling device 10 may automatically switch the mode suitable for the current state based on, for example, detection of the inside / outside air temperature.

Next, the characteristic effects of this embodiment will be described.

The cooling device 10 is configured so that the outside air first air passage 16a through which the outside air passes through the first heat exchanger 21, the outside air second air passage 16b through which the outside air bypasses the first heat exchanger 21, and the flow of the outside air to any one of them. And a switching unit 28 for switching. When the inside air temperature is lower than the outside air temperature, the switching operation of the switching unit 28 is performed so that the first heat exchanger 21 does not perform reverse heat exchange between the inside and outside air. By this operation, the main flow of the outside air is switched to the outside air second air passage 16b side that bypasses the first heat exchanger 21, and the function as the first heat exchanger 21 is suppressed. Therefore, even if the inside air passes through the first heat exchanger 21, it can be suppressed from being heated by the outside air, and the cooling capacity of the cooling device 10 can be stabilized.

The cooling device 10 switches the function of the first heat exchanger 21 by switching the flow of outside air. As this switching means, the outside air first and

second air passages

16a and 16b are configured in parallel to the cooling device 10, and the switching unit 28 is used to switch the flow of the outside air to any one of them. Thereby, switching of the function of the 1st heat exchanger 21 is realizable with comparatively simple composition.

The cooling device 10 uses the pressure loss difference between the first and

second air passages

16a and 16b in the outside air, and has a configuration in which the switching unit (opening / closing member) 28 is provided only on the side of the second air passage 16b. It is possible to contribute to simplification of the internal structure of the cooling device 10 and to expect a reduction in size of the cooling device 10.

The switching unit 28 is configured by an opening / closing member that opens and closes the inlet of the outside air second air passage 16b. Therefore, the switching unit 28 can be realized with a relatively simple configuration.

The cooling device 10 can be realized with a relatively simple configuration by switching the flow of only the outside air as means for switching the function of the first heat exchanger 21.

Note that the above embodiment may be modified as follows.

In the above embodiment, the outside air first and

second air passages

16a and 16b are configured in parallel, and the outside air flow is changed by using the switching unit 28 that switches the outside air flow to any one of them. . However, it is good also as a structure which changes the flow of internal air like the cooling device 10 shown in FIG. The inside air blowing path 13 is configured in parallel with the inside air first blowing path 13 a and the inside air second blowing path 13 b on the downstream side of the inside air blower 26. Inside air passes through the first heat exchanger 21 in the inside air first air passage 13a. In the inside air first air passage 13 a, the inside air bypasses the first heat exchanger 21 and goes directly to the evaporator 23. The switching unit 28 is configured by an opening / closing member that opens and closes the inlet of the inside air second air passage 13b. Even with such a configuration, it is possible to obtain the same effect as the above-described embodiment.

Further, the cooling device 10 may use both configurations of the outside air switching in FIG. 7 and the inside air switching in FIG.

In FIG. 7, the switching portion (opening / closing member) 28 is provided only on the outside air second air passage 16b side by utilizing the pressure loss difference between the outside air first and

second air passages

16a and 16b. In FIG. 8, the switching portion (opening / closing member) 28 is provided only on the side of the inside air second air passage 13b by utilizing the pressure loss difference between the inside air first and

second air passages

13a and 13b. However, an open / close member or the like that is also interlocked may be provided on the outside air first air passage 16a side and the inside air first air passage 13a side. In this way, it is possible to switch the flow of outside air in FIG. 7 and the flow of internal air in FIG. 8 more accurately (for example, almost all of the flow).

Further, in the configuration of FIG. 7, a blower (not shown) is installed in each of the first and

second blower passages

16a and 16b of the outside air (the blower 27 for outside air can be omitted). In the configuration of FIG. 8, a blower (not shown) is installed in each of the inside air first and

second air passages

13a and 13b (the inside air blower 26 may be omitted). In addition, the flow of outside air or inside air can be switched by switching the operation mode of each blower. In this case, each air blower of the outside air first and

second air passages

16a and 16b and each air fan of the inside air first and

second air passages

13a and 13b serve as a switching unit.

7 and 8 has a function of opening and closing the air passage. Specifically, as shown in FIG. 7 and FIG. 8, open / close members that open and close by a rotating operation, and open / close members that open and close by a sliding operation are included.

In addition, the configuration of the cooling device 10 may be changed as appropriate. For example, the installation positions of the evaporator 23, the condenser 24, the inside air blower 26, the outside air blower 27, and the like may be appropriately changed. Among them, for example, in FIG. 7 and FIG. 8, they are installed on the upstream side of the first heat exchanger 21 by using the push-in type internal air blower 26 and the external air blower 27, respectively. You may install in the downstream of 1 heat exchanger 21.

7 and 8, the first heat exchanger 21 is rectangular when viewed from the side, but a hexagonal or rhombus-shaped one may be used. 7 and 8, the L-shaped air path in the first heat exchanger 21 is used, but a U-shaped or I-shaped (straight type) may be used.

In FIG. 7, the outside air first and

second air passages

16a and 16b are arranged side by side without a partition. In FIG. 8, the inside air first and

second air passages

13a and 13b are arranged side by side without a partition. It may be provided. The partition wall functions to more accurately separate between the outside air first and

second air passages

16a and 16b and between the inside air first and

second air passages

13a and 13b, and to support the first heat exchanger 21. It becomes a function to do.

Further, in terms of arrangement, the first heat exchanger 21 and the condenser 24 are arranged in parallel in FIG. 7, and the first heat exchanger 21 and the evaporator 23 are arranged in parallel in FIG. However, even if each is arranged in series, it is only necessary that the air passages have a parallel configuration, that is, a configuration that can bypass the first heat exchanger 21.

Moreover, although the 1st heat exchanger 21 and the 2nd heat exchanger 22 were functioned as internal air cooling, you may carry out the reverse usage of the cooling device 10 for internal air heating.

Next, the technical idea that can be grasped from the above embodiment and other examples will be added as an appendix below.

(Supplementary note 1) A first heat exchanger that performs heat exchange between the first and second air by a counter flow method, an evaporator, a condenser, and a compressor, and between the first and second air A second heat exchanger for carrying heat, a first air passage for the first air to pass through the first heat exchanger, and for the first air to bypass the first heat exchanger And a switching unit that changes a ratio between the air volume of the first air in the first air path and the air volume of the first air in the second air path. .

(Appendix 2) The cooling device according to appendix 1, wherein the switching unit changes the ratio by a switching member that switches the flow of the first air between the first and second air passages.

(Additional remark 3) The said 2nd ventilation path is comprised so that a pressure loss may become smaller than the said 1st ventilation path, The said switching part is the said 2nd ventilation provided in the inlet_port | entrance of the said 2nd ventilation path. The cooling device according to appendix 1, wherein the ratio is changed by an opening / closing member that opens and closes an entrance of the road.

(Additional remark 4) Furthermore, the 1st temperature detection part which detects the temperature of the said 1st air, the 2nd temperature detection part which detects the temperature of the said 2nd air, and the temperature which the said 1st temperature detection part detected Alternatively, the cooling device according to appendix 1, further comprising: a control unit that controls the switching unit based on at least one of the temperatures detected by the second temperature detection unit.

(Additional remark 5) Furthermore, it has the 1st air blower which produces the air current of the 1st air, and the 2nd air fan which produces the air current of the 2nd air, The control part has the 1st temperature detection part. The cooling according to appendix 4, wherein the second heat exchanger, the first blower, and the second blower are controlled based on at least one of the detected temperature or the temperature detected by the second temperature detection unit. apparatus.

(Supplementary note 6) The cooling device according to supplementary note 4, further comprising a display unit that displays information related to the switching unit based on information from the control unit.

(Appendix 7) The cooling device according to Appendix 4, further comprising a communication unit that communicates with the outside based on information from the control unit.

(Supplementary note 8) The cooling device according to supplementary note 1, wherein the first air is one of inside air and outside air, and the second air is the other.

(Supplementary Note 9) Second heat that includes a first heat exchanger that exchanges heat between the inside air and the outside air by a counter flow method, an evaporator, a condenser, and a compressor, and that transfers heat between the inside air and the outside air An exchanger, an inside air first air passage for the inside air to pass through the first heat exchanger, an inside air second air passage for the inside air to bypass the first heat exchanger, and the outside air An outside air first air passage for passing through the first heat exchanger, an outside air second air passage for allowing the outside air to bypass the first heat exchanger, and an air volume of the inside air in the inside air first air passage; A first switching unit that changes a ratio of the internal air flow rate in the internal air second air flow path; and a ratio between the external air flow rate in the external air first air flow path and the external air flow rate in the external air second air flow path. And a second switching unit to be changed.

The present invention is useful for cooling a room or a server room that houses a large number of storage batteries or power conditioners.

A Cooling target 10 Cooling device 11 Housing 12 Mounting surface 12a Inside air introduction port 12b Inside air discharge port 13 Inside air blowing path 13a Inside air first blowing path 13b Inside air second blowing path 14 Controller 15 Outside surface 15a Outside air introduction port 15b Outside air outlet 16 Outside air ventilation path 16a Outside air 1st ventilation path 16b Outside air 2nd ventilation path 17 Inside air temperature detection part 18 Outside air temperature detection part 21 1st heat exchanger 22, 22a, 22b

2nd heat exchanger

23, 23a,

23b Evaporator

24, 24a,

24b Capacitors

25, 25a, 25b Compressor 26 Blower for inside air 27 Blower for outside air 28 Switching unit 29 Control unit 30 Display unit 31 Communication unit

Claims

A first heat exchanger that exchanges heat between the first and second air in a counterflow manner;
A second heat exchanger comprising an evaporator, a condenser, and a compressor, and carrying heat between the first and second air;
A first air passage for the first air to pass through the first heat exchanger;
A second air passage for the first air to bypass the first heat exchanger;
A switching unit that changes a ratio of the air volume of the first air in the first air duct and the air volume of the first air in the second air duct;
With a cooling device.
The switching unit changes the ratio by a switching member that switches the flow of the first air between the first and second air passages.
The cooling device according to claim 1.
The second air passage is configured such that the pressure loss is smaller than that of the first air passage,
The switching unit changes the ratio by an opening and closing member that opens and closes the inlet of the second air passage provided at the inlet of the second air passage.
The cooling device according to claim 1.
A first temperature detector for detecting a temperature of the first air;
A second temperature detector for detecting the temperature of the second air;
A control unit that controls the switching unit based on at least one of the temperature detected by the first temperature detection unit or the temperature detected by the second temperature detection unit;
The cooling device according to claim 1, comprising:
Furthermore, a first blower that generates an air flow of the first air;
A second blower for generating an air flow of the second air,
The control unit is configured to control the second heat exchanger, the first blower, and the first based on at least one of a temperature detected by the first temperature detection unit or a temperature detected by the second temperature detection unit. 2 Control the blower,
The cooling device according to claim 4.
And a display unit for displaying information on the switching unit based on information from the control unit.
The cooling device according to claim 4.
And a communication unit that communicates with the outside based on information from the control unit.
The cooling device according to claim 4.
The first air is either inside air or outside air, and the second air is the other.
The cooling device according to claim 1.
A first heat exchanger that exchanges heat between the inside air and the outside air in a counterflow manner;
A second heat exchanger consisting of an evaporator, a condenser, and a compressor, for transferring heat between the inside air and the outside air;
An inside air first air passage for allowing the inside air to pass through the first heat exchanger;
An inside air second air passage for allowing the inside air to bypass the first heat exchanger;
An outside air first air passage for allowing the outside air to pass through the first heat exchanger;
An outside air second air passage for allowing the outside air to bypass the first heat exchanger;
A first switching unit that changes a ratio of the amount of the inside air in the inside air first air passage and the amount of the inside air in the inside air second air passage;
A second switching unit that changes a ratio of the air volume of the outside air in the first outside air path and the air volume of the outside air in the second outside air path;
With cooling device.