JP2016121848A - Cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooler capable of suppressing reverse heat exchange between inside and outside air in a heat exchanger, to stabilize cooling capacity.SOLUTION: A cooler 10 includes: a first air blowing passage 15a for outside air in which outside air passes through a heat exchanger 21; a second air blowing passage 15b for outside air in which outside air detours the heat exchanger 21; and a flow passage switching member 28 switching a flow passage for outside air to any one. When the temperature of inside air is lower than the temperature of outside air, reverse heat exchange between inside and outside air is performed in the heat exchanger 21, and in this case, a main stream of outside air is switched to the side of the second air blowing passage 15b in which the main stream detours the heat exchanger 21 by switching operation of the flow passage switching member 28, and a function as the heat exchanger 21 is suppressed.SELECTED DRAWING: Figure 1

Description

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

  Conventionally, as a cooling device for cooling the inside air in a device or structure having a heat source in a housing or a room, a device disclosed in, for example, Patent Document 1 is known.

  As a configuration of the cooling device (server storage device having a cooling function) of Patent Document 1, first, the outside air is circulated by being connected to a first air passage through which the inside air of the object to be cooled (heat source side) circulates and a duct communicating with the outside. The second air passages are arranged in parallel, and 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, respectively, and a refrigeration circuit including an evaporator, a condenser, and a compressor (compressor) is configured. . The refrigeration circuit absorbs the heat of the inside 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, and performs heat exchange to cool the inside air. Yes.

  Furthermore, in the disclosed technique of the 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 and second air passages, and is located upstream of the evaporator of the first air passage and upstream of the condenser of the second air passage. Is provided. The heat exchanger preliminarily absorbs the inside air by heat exchange between the inside and outside air before the inside air reaches the evaporator. In other words, the inside air can be cooled in two stages of the heat exchanger and the refrigeration circuit.

JP 2010-160533 A (FIG. 4)

  By the way, the 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 temperature of the outside air is low and the temperature of the inside air is high. However, in an environment where the temperature of the outside air is high and the temperature of the inside air is low, the heat exchange action between the inside and outside air is reversed due to the mechanism of the heat exchanger, and the inside air is heated. Since the inside air is cooled by the downstream evaporator, a part of the cooling action by the evaporator is offset. That is, since the heat exchange becomes inefficient in the entire cooling device, a means for avoiding such a situation is necessary.

  The present invention has been made to solve the above-described problems, and the object thereof is to suppress reverse heat exchange between the inside and outside air in the heat exchanger and to stabilize the cooling capacity. It is to provide a cooling device that can be used.

  A cooling device that solves the above problems includes a counter-flow type heat exchanger that allows the inside air and outside air to be cooled to pass through each other and exchanges heat between the inside and outside air, and an evaporator and a condenser that carry heat between the inside and outside air. A cooling circuit that includes the refrigeration circuit and a blower that generates the air flow of the inside air and the outside air, and cools the inside air to be cooled by a blowing operation of the blower and a cooling operation of at least one of the heat exchanger and the refrigeration circuit. A function as the heat exchanger as a cooling device, in which at least one of the inside air and the outside air bypasses the heat exchanger from the mode in which the inside air and the outside air pass each other and function as the heat exchanger It is provided with switching means for switching to a mode for suppressing the above.

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

It is a block diagram of the cooling device in one Embodiment. It is a block diagram of the cooling device in another example.

  Hereinafter, an embodiment of the cooling device will be described.

  As shown in FIG. 1, the cooling device 10 cools a cooling target A having a heat source, for example, cools 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 surface of the storage battery chamber, which is the cooling target A, in the number and arrangement considering the size of the storage battery chamber, and cools by introducing the inside air of the storage battery chamber through the through-hole provided in the wall surface. Then, it is supplied again into the storage battery chamber.

  The casing 11 of the cooling device 10 has, for example, a rectangular 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. An inside air discharge port 12b is provided at a position spaced below the introduction port 12a. Inside the housing 11, an inside air blowing path 13 is configured between 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 introduction port 12a, and the low temperature inside air cooled by the passage through the inside air blowing path 13 is discharged from the inside air discharge port 12b to the cooling target A.

  In addition, the outer surface 14 of the housing 11 opposite to the mounting surface 12 is provided with an outside air introduction port 14a on the lower side, and an outside air discharge port 14b is provided at a position spaced above the outside air introduction port 14a. It has been. The outside air introduction port 14a is provided below the inside air discharge port 12b, and the outside air discharge port 14b 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 15 is formed between the outside air inlet 14 a and the outside air outlet 14 b. Outside air around the cooling device 10 is introduced into the outside air introduction port 14a, and high temperature outside air heated by exhaust heat at the time of passing through the outside air blowing passage 15, that is, cooling of the inside air is discharged from the outside air discharge port 14b.

  Inside the housing 11, a heat exchanger (heat exchange element) 21 and a refrigeration circuit 22 are provided as means for cooling the inside air. The 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 refrigeration circuit 22 includes an evaporator (evaporator) 23, a condenser (condenser) 24, a compressor 25, and pipes (both not shown) that connect the devices and circulate the refrigerant, and transfer heat between the inside and outside air. Device. 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 15 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, a heat exchanger 21 is arranged next, 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 heat exchanger 21, then passes through the evaporator 23, and is cooled from the inside air discharge port 12b. A is discharged to A.

  On the other hand, the outside air blowing path 15 includes an outside air blower 27 in the vicinity of the outside air introduction port 14a, and the downstream side thereafter is paralleled as two blowing paths, that is, the outside air first blowing path 15a and the outside air second blowing path 15b. It is configured. The heat exchanger 21 is disposed on the outside air first air passage 15a side, and the flow path switching member 28 is disposed on the outside air second air passage 15b side, and the condenser 24 is disposed on the downstream side thereof. The flow path switching member 28 is provided side by side with the inlet of the outdoor air side flow path of the heat exchanger 21, and is constituted by, for example, an opening / closing member that opens and closes the inlet of the external air second air passage 15b.

  That is, the flow path switching member 28 closes the inlet of the outside air second air passage 15b to guide the outside air that has passed through the outside air blower 27 to the outside air first air passage 15a side, and opens the entrance of the outside air second air passage 15b. By doing so, the operation | movement which guides the external air which passed through the external air blower 27 to the own external air 2nd ventilation path 15b side is performed. In addition, although the inlet of the outside air side flow path of the heat exchanger 21 is left open and no opening / closing member is used, the pressure loss (flow path resistance) of the outside air first air passage 15a including the heat exchanger 21 is greater than the capacitor 24. Therefore, the flow of the outside air when the inlet of the outside air second air passage 15b is opened by the flow path switching member 28 is mainly the outside air on the side where the pressure loss is small. It switches to the 2nd ventilation path 15b.

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

[Inside air cooling mode by heat exchanger 21]
This mode is used when the temperature of the inside air is higher than the temperature of the outside air, and the inside air is cooled only by the heat exchanger 21. In this mode, the inside air blower 26 and the outside air blower 27 are blown, while the operation of the refrigeration circuit 22 is stopped. The flow path switching member 28 closes the inlet of the outside air second air passage 15b.

  Due to 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 side flow path of the heat exchanger 21. Further, by the blowing operation of the outside air blower 27, outside air flows through the outside air blowing path 15, in this case, the outside air first blowing path 15 a side, and passes through the outside air side flow path of the heat exchanger 21. As a result, the heat exchanger 21 absorbs the inside air and exhausts the outside air, and the cooled inside air is supplied to the cooling target A.

[Inside air cooling mode using both heat exchanger 21 and refrigeration circuit 22]
This mode is used when the temperature of the inside air is higher than the temperature of the outside air, and is a mode in which sufficient cooling of the inside air is performed using the heat exchanger 21 and the refrigeration circuit 22 in combination. In this mode, the blowing operation of the inside air blower 26 and the outside air blower 27 and the cooling operation of the refrigeration circuit 22 are performed. The flow path switching member 28 makes the inlet of the outside air second air passage 15b a half-open state (a predetermined amount of the open state).

  The inside air is cooled by the heat exchanger 21 by the blowing operation of the inside air blower 26 and the outside air blower 27, and further cooled by passing through the evaporator 23 downstream thereof, and the sufficiently cooled inside air is cooled. To be supplied.

  Further, on the outside air side, exhaust heat from the heat exchanger 21 and exhaust heat from the condenser 24 are performed. Since the inlet of the outside air second air passage 15b is semi-opened (semi-closed) by the flow path switching member 28, the outside air is distributed to each of the outside air first and second air passages 15a and 15b, and heat exchange is performed. The exhaust heat in the vessel 21 and the exhaust heat in the condenser 24 are preferably performed.

[Inside air cooling mode by refrigeration circuit 22]
This mode is used in the case where the temperature of the inside air is equal to or lower than the temperature of the outside air, contrary to the environment of the above two modes, and in this case, the inside air is cooled by the refrigeration circuit 22. . That is, since the heat exchanger 21 performs reverse heat exchange between the inside and outside air, the heat exchange action in the heat exchanger 21 is suppressed. In this mode, the air blowing operation of the inside air blower 26 and the outside air blower 27 and the cooling operation of the refrigeration circuit 22 are performed, and the flow path switching member 28 switches the inlet of the outside air second air flow path 15b to the open state.

  When the inlet of the outside air second air passage 15b is opened by the flow path switching member 28, the main flow of the outside air is switched to the outside air second air passage 15b side. That is, since the supply of outside air to the heat exchanger 21 of the first outside air passage 15a is sufficiently reduced, the heat exchange action in the heat exchanger 21 is sufficiently suppressed (the function as the heat exchanger 21 is suppressed). ). As a result, when the inside air passes through the heat exchanger 21, it is sufficiently suppressed that the inside air is heated by the outside air.

  The inside air that has passed through the heat exchanger 21 is cooled by passing through the evaporator 23, and the cooled inside air is supplied to the cooling target A. Further, since the main flow of the outside air in this mode is the outside air second air passage 15b side, the exhaust heat from the condenser 24 is carried on the outside air flow.

  Each of the above cooling modes may be switched by a user's operation of a mode change switch or the like, and the control circuit (not shown) of the cooling device 10 is used to detect the current temperature based on, for example, the detection of the temperature of the inside and outside air. The mode suitable for the mode may be automatically switched.

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

  (1) The cooling device 10 according to the present embodiment includes an outside air first air passage 15a through which outside air passes through the heat exchanger 21, an outside air second air passage 15b through which outside air bypasses the heat exchanger 21, and an outside air passage. And a flow path switching member 28 for switching between the two. If the inside air temperature is lower than the outside air temperature, the heat exchanger 21 performs reverse heat exchange between the inside and outside air. In such a case, the switching operation of the flow path switching member 28 is performed. The main flow of the outside air is switched to the outside air second air passage 15b side that bypasses the heat exchanger 21, and the function as the heat exchanger 21 is suppressed. Therefore, even if the inside air passes through the heat exchanger 21, it can be suppressed from being warmed by the outside air, and the cooling capacity of the cooling device 10 can be stabilized.

  (2) As means for switching the function of the heat exchanger 21 by switching the outside air flow path, the outside air first and second air passages 15a and 15b are configured in parallel to the cooling device 10, and the outside air flow path is configured. Since the configuration using the flow path switching member 28 for switching to any one of them is realized, it can be realized with a relatively simple configuration.

  (3) By using the pressure loss difference between the first and second air passages 15a and 15b in the outside air, the flow path switching member (opening / closing member) 28 is provided only on the second air passage 15b side, so that the cooling device 10 It can contribute to the simplification of the internal structure and can be expected to reduce the size of the cooling device 10.

  (4) Since the flow path switching member 28 is configured with an opening / closing member that opens and closes the inlet of the outside air second air passage 15b, the flow path switching member 28 can be realized with a relatively simple configuration.

  (5) By adopting a configuration that switches the flow path of only the outside air as means for switching the function of the heat exchanger 21, it can be realized with a relatively simple configuration.

  In addition, you may change the said embodiment as follows.

  The outside air first and second air passages 15a, 15b are configured in parallel, and the outside air flow path is changed using the flow path switching member 28 that switches the outside air flow path to any one of them, It is good also as a structure which changes the flow path of inside air like the cooling device 10a shown in FIG. The inside air blowing path 13 includes an inside air first blowing path 13a through which the inside air passes through the heat exchanger 21 and an inside air that bypasses the heat exchanger 21 and goes directly to the evaporator 23 on the downstream side of the inside air blower 26. The second air passage 13b is configured in parallel. The flow path switching member 29 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.

  Moreover, you may use the structure of both the switching of the outside air side of FIG. 1, and the switching of the inside air side of FIG.

  In FIG. 1, the pressure loss difference between the outside air first and second air passages 15a and 15b is used, and a flow path switching member (opening / closing member) 28 is provided only on the second air passage 15b side, and in FIG. Although the flow path switching member (opening / closing member) 29 is provided only on the second air passage 13b side using the pressure loss difference between the two air passages 13a and 13b, the outside air first air passage 15a side and the inside air first air passage 13a, respectively. An opening / closing member or the like interlocking with the side may also be provided. In this way, the flow of outside air in FIG. 1 and the flow of inside air in FIG. 2 can be switched reliably (for example, all of the flow can be switched reliably).

  Further, in FIG. 1, a blower (not shown) is installed in each of the outside air first and second air passages 15a and 15b (the outside air blower 27 can be omitted), and in FIG. 2, the inside air first and second air passages 13a and 13b. It is also possible to perform switching of the flow path of the outside air or the inside air by installing a blower (not shown) in each of them (the inside air blower 26 can be omitted) and switching the operation mode of each blower. In this case, each blower of the outside air first and second blower passages 15a and 15b and each blower of the inside air first and second blower passages 13a and 13b serve as switching means.

  The flow path switching members 28 and 29 shown in FIG. 1 and FIG. 2 have a function of opening and closing the flow path. Specifically, the open / close is opened and closed by a rotating operation as shown in FIG. 1 and FIG. Other components such as a member or an opening / closing member that opens and closes by a sliding operation are also included.

  -In addition, you may change the structure of the cooling device 10 suitably. For example, the installation positions of the evaporator 23, the condenser 24, the blowers 26 and 27, and the like may be changed as appropriate. Among them, for example, in FIG. 1 and FIG. 2, the push-type blowers 26 and 27 are installed on the upstream side of the heat exchanger 21, but the suction-type blower is used on the downstream side of the heat exchanger 21. May be installed.

  Moreover, although the heat exchanger 21 used the rectangular thing in the side view in FIG.1 and FIG.2, a hexagonal shape or a rhombus shape may be used. Moreover, although the flow path in the heat exchanger 21 in FIG.1 and FIG.2 used the L-shaped thing, you may use a U-shaped thing or an I-shaped (straight type) thing.

  In FIG. 1, the outside air first and second air passages 15a and 15b are arranged side by side without a partition. In FIG. 2, 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 also functions to reliably separate the air passages 15a and 15b and the air passages 13a and 13b from each other, and to support the heat exchanger 21.

  Further, in terms of arrangement, the heat exchanger 21 and the condenser 24 are arranged in parallel in FIG. 1, and the heat exchanger 21 and the evaporator 23 are arranged in parallel in FIG. It suffices if the path (fan path) has a parallel configuration.

  Moreover, although the heat exchanger 21 and the refrigerating circuit 22 were functioned as internal air cooling, you may use the cooling device 10 reversely for internal air heating.

  Next, technical ideas that can be grasped from the above-described embodiment and other examples will be additionally described below.

(Appendix 1) A counter-flow type heat exchanger that allows the inside air and the outside air to be cooled to pass through each other and exchange heat between the inside and outside air, a refrigeration circuit that includes an evaporator and a condenser that performs heat transfer between the inside and outside air, A cooling device for cooling the inside air to be cooled by a blowing operation of the blower and a cooling operation of at least one of the heat exchanger and the refrigeration circuit. ,
From the aspect in which the inside air and the outside air are allowed to pass each other and function as the heat exchanger, a part or all of at least one side of the inside air and the outside air is switched to a flow path that bypasses the heat exchanger as the heat exchanger. A cooling device characterized by comprising switching means for switching to a mode that suppresses the function.

(Supplementary note 2) In the cooling device according to supplementary note 1,
The switching means includes a first air passage through which the inside air or outside air passes through the heat exchanger, a second air passage through which the inside air or outside air bypasses the heat exchanger, and a flow path of the inside air or outside air. A cooling device comprising: a flow path switching member that switches to one of the first and second air passages.

(Supplementary note 3) In the cooling device according to supplementary note 2,
The first air passage through which the inside air or outside air passes through the heat exchanger is configured such that the pressure loss is relatively larger than the second air passage through which the inside air or outside air bypasses the heat exchanger. ,
The cooling device according to claim 1, wherein the flow path switching member is configured by an opening / closing member that opens and closes an inlet of the second air passage on the side having a small pressure loss.

(Appendix 4) In the cooling device according to any one of appendices 1 to 3,
The cooling device, wherein the switching means is configured for only one of the inside air and outside air.

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

  A ... Cooling target, 13a ... Inside air first air passage (switching means, first air passage), 13b ... Inside air second air passage (switching means, second air passage), 15a ... Outside air first air passage (switching means, switching means, First air passage), 15b ... Outside air second air passage (switching means, second air passage), 21 ... Heat exchanger, 22 ... Refrigeration circuit, 23 ... Evaporator, 24 ... Condenser, 26 ... Blower for inside air, 27 ... Outside air blower, 28, 29... Flow path switching member (switching means).

Claims (4)

A counter-flow type heat exchanger that allows the inside air and the outside air to be cooled to pass through each other and exchanges heat between the inside and outside air, a refrigerating circuit that includes an evaporator and a condenser that performs heat transfer between the inside and outside air, and the inside air and outside air A cooling device that cools the internal air of the cooling target in a blowing operation of the blower and a cooling operation of at least one of the heat exchanger and the refrigeration circuit,
From the aspect in which the inside air and the outside air are allowed to pass each other and function as the heat exchanger, a part or all of at least one side of the inside air and the outside air is switched to a flow path that bypasses the heat exchanger as the heat exchanger. A cooling device characterized by comprising switching means for switching to a mode that suppresses the function. The cooling device according to claim 1, wherein
The switching means includes a first air passage through which the inside air or outside air passes through the heat exchanger, a second air passage through which the inside air or outside air bypasses the heat exchanger, and a flow path of the inside air or outside air. A cooling device comprising: a flow path switching member that switches to one of the first and second air passages. The cooling device according to claim 2, wherein
The first air passage through which the inside air or outside air passes through the heat exchanger is configured such that the pressure loss is relatively larger than the second air passage through which the inside air or outside air bypasses the heat exchanger. ,
The cooling device according to claim 1, wherein the flow path switching member is configured by an opening / closing member that opens and closes an inlet of the second air passage on the side having a small pressure loss. In the cooling device according to any one of claims 1 to 3,
The cooling device, wherein the switching means is configured for only one of the inside air and outside air.

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