JP2022116291A - Heat exchange assist device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently assist in exchanging heat of a heat source side air heat exchanger in a heat source device.

SOLUTION: A heat exchange assist device comprises an air blower 10, a radiator 20 that passes air received from the air blower 10 and exchanges heat with cold/hot water supplied from the outside, a first duct part 40 that takes in and circulates air having passed through the radiator 20, and an air discharge part 50 that is connected to the downstream side of the first duct part 40 and discharges the air in the first duct part 40, where the air discharge part 50 is provided so as to blow air to an air suction surface of a heat source side air heat exchanger a1 of a heat source device A.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a heat exchange auxiliary device that assists heat exchange of a heat source side air heat exchanger in existing heat source equipment having a refrigeration cycle, such as chillers, refrigerators, showcases, air conditioners, water heaters, etc. be.

The operation of air-cooled outdoor units such as cooling and heating and refrigerators is always affected by the outside air temperature. In particular, in the cooling operation in the summer, the higher the outside air temperature, the more energy is consumed. In addition, in a snowy country, snow adheres to the air heat exchanger and freezes, resulting in frequent useless defrost operation and interruption of heating operation.
Therefore, it is conceivable to change the outdoor unit to a water-cooled type, but it is not realistic because the existing equipment is wasted and the initial cost is enormous.

In order to solve such a problem, for example, in the invention described in Patent Document 1, an air conditioner that constitutes a refrigeration cycle and an auxiliary air heat exchanger that circulates water stored in a water tank to an auxiliary air heat exchanger. and an auxiliary air heat exchanger is brought close to the outdoor heat exchanger of the air conditioner, and the air after heat exchange by the auxiliary air heat exchanger is passed through the outdoor heat exchanger again for heat exchange. As a result, it is difficult to be adversely affected by the outside air temperature, and the efficiency of the refrigeration cycle is improved.

JP 2015-78813 A

However, according to the above conventional technology, it is necessary to arrange an auxiliary air heat exchanger near the outdoor heat exchanger of the air conditioner. Therefore, for example, when there are many air conditioners, it is necessary to provide an auxiliary air heat exchanger for each outdoor heat exchanger of the air conditioner.
In addition, for example, when an air-cooled chiller has an air heat exchanger (plate fin coil) bent in a U-shaped cross section on three side surfaces, An auxiliary air heat exchanger needs to be arranged, which complicates the construction and increases the cost. Moreover, in any of the above-described modes, there is a concern that the outside air may receive resistance from the auxiliary air heat exchanger, or the air that hits or passes through the auxiliary air heat exchanger may leak in the lateral direction, resulting in a decrease in efficiency. be.

In view of such problems, the present invention comprises the following configurations.
A blower, a radiator for passing air received from the blower and exchanging heat with cold/hot water supplied from the outside, a first duct section for taking in and circulating the air that has passed through the radiator, and the first duct section. and an air discharge section connected to the downstream side of the first duct section for discharging air in the first duct section, wherein the air discharge section blows air onto the air intake surface of the heat source side air heat exchanger of the heat source equipment. A heat exchange auxiliary device characterized by being provided in.

INDUSTRIAL APPLICABILITY Since the present invention is configured as described above, it is possible to efficiently assist the heat exchange of the heat source side air heat exchanger of the existing heat source equipment with a simple structure.

1 is a plan view showing a main part of an example of an auxiliary heat exchange device according to the present invention, where (a) shows a state before mounting the auxiliary heat exchange device on a heat source device, and (b) shows the auxiliary heat exchange device. is attached to the heat source equipment. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic structure drawing which shows a principal part in a cross section about an example of the heat exchange auxiliary|assistant apparatus which concerns on this invention. FIG. 5 is a schematic structural diagram showing a cross section of a main part of another example of the heat exchange auxiliary device according to the present invention. FIG. 5 is a schematic structural diagram showing a cross section of a main part of another example of the heat exchange auxiliary device according to the present invention.

The present embodiment discloses the following features.
The first feature is a blower, a radiator that allows the air received from the blower to pass through and exchanges heat with cold and hot water supplied from the outside, and a first duct portion that takes in and distributes the air that has passed through the radiator, an air discharge part connected to the downstream side of the first duct part and discharging air in the first duct part, wherein the air discharge part sucks air into a heat source side air heat exchanger of the heat source equipment. It is provided to blow air onto the surface (see FIGS. 1-4).

As a second feature, the air discharge part is formed so as to be close to and cover the air suction surface of the heat source side air heat exchanger of the heat source equipment (see FIGS. 1 to 4). .

The third feature is that the air discharged from the heat source side air heat exchanger of the heat source equipment is collected and the second duct portion is provided to return the air to the suction side of the blower (see FIG. 3).

A fourth feature is that an air flow rate adjusting device is provided for adjusting the amount of air returned to the suction side of the blower by the second duct portion (see FIG. 3).

A fifth feature is that the radiator has a cold/hot water circulation path for circulating cold/hot water, and the circulation water path includes a water heat exchanger for heat-exchanging the circulating cold/hot water with natural water, and a circulating cold/hot water. A temporary storage tank is provided to temporarily store and then flow the water (see FIGS. 2 to 4).

<First Embodiment>
Next, a first embodiment having the above features will be described in detail with reference to the drawings.
1 and 2 show an example of a heat exchange auxiliary device according to the present invention.

This heat exchange auxiliary device 1 includes a blower 10, a radiator 20 that allows the air received from the blower 10 to pass through and exchanges heat with hot and cold water supplied from the outside, a collecting pipe section 30 that takes in the air that has passed through the radiator 20, A first duct portion 40 connected to the downstream side of the collecting pipe portion 30 for circulating air, and a plurality of duct portions 40 connected to the downstream side of the first duct portion 40 and discharging the air supplied from the first duct portion 40. , a cold/hot water circulation path 60 that circulates cold/hot water in the radiator 20, and a natural water circulation path 70 that exchanges heat with the cold/hot water circulation path 60. Air is blown to the air intake surface of the air heat exchanger a1 to assist the heat exchange effect of the heat source side air heat exchanger a1.

Here, the heat source equipment to which the heat exchange auxiliary device 1 assists in heat exchange may be equipment having a refrigeration cycle, such as a chiller, an air conditioner, a refrigerator, and a water heater. This heat source device can be a heat pump device, a cooling-only device, or a heating-only device.
The heat source device A illustrated in FIGS. 1 to 3 is an outdoor unit of a heat pump air conditioner, and includes an air-cooled heat source side air heat exchanger a1 and a fan a2 that circulates air through the heat source side air heat exchanger a1. .
According to the illustrated example, the heat source side air heat exchanger a1 is formed by bending a substantially rectangular plate-like plate fin coil into a substantially L shape when viewed from above.

For example, a propeller fan, a sirocco fan, a turbo fan, or the like can be used as the blower 10 .

The radiator 20 includes a large number of heat exchange fins 21 arranged substantially parallel with appropriate gaps, and a water pipe 22 passing through the heat exchange fins 21 in a meandering manner. Heat exchange is performed between the air flowing through the gap and the liquid (cold/hot water) flowing through the water pipe 22 .

The collecting pipe portion 30 is formed to collect air on the delivery side of the radiator 20, and according to the illustrated example, a tubular portion 31 covering the sides of the fan 10 and the radiator 20 and a downstream side of the tubular portion 31 , and the opening on the upstream side of the cylindrical portion 31 is used as a suction port.

The first duct portion 40 is an elongated cylindrical or rectangular tubular duct. The first duct section 40 is configured by appropriately connecting a straight tubular duct or an elbow duct according to the installation situation of the plurality of heat source devices A. As shown in FIG.
The first duct portion 40 communicates with the collecting pipe portion 30 on the upstream side and is closed at the end on the most downstream side.

The air discharge part 50 is provided so as to branch off from the peripheral wall surface of the first duct part 40 . Specifically, the air discharge portion 50 includes a branch pipe portion 51 branched from the first duct portion 40 in a T-shape, and a hood portion 52 connected to the downstream side of the branch pipe portion 51. Prepare for unity.

According to the illustrated example, the branch pipe portion 51 is a short straight pipe, but it may be a long straight pipe, a bellows pipe, or other suitable length and shape depending on the installation situation of the heat source device A. is used.

The hood portion 52 is formed in the shape of a hood that is close to the air suction surface of the heat source side air heat exchanger a1 of the heat source device A and covers the air suction surface.
The hood portion 52 is formed in a diffuser shape that expands downstream from the branch pipe portion 51, and its downstream end extends from the two intersecting suction surfaces of the heat source side air heat exchanger a1. substantially all of the is covered in an L shape (see FIGS. 1 to 3).

The collecting pipe portion 30, the first duct portion 40, and the air discharge portion 50 are heat-insulated with a heat insulating material on their outer surface sides. For example, urethane foam, glass wool, or other well-known heat insulating materials can be used for this heat insulating material.

In addition, the cold/hot water circulation path 60 includes the secondary side portion of the radiator 20 described above and the liquid (cold/hot water) on the secondary side in the circulation path connected by piping. It comprises a water heat exchanger 61 for exchange, a temporary storage tank 62 for temporarily storing the liquid circulating on the secondary side and then flowing it, and a pump 63 for forcibly conveying cold and hot water (see FIG. 2).

The water heat exchanger 61 is a plate type that exchanges heat between natural water on the primary side (e.g., groundwater, etc.) and liquid on the secondary side (e.g., anticorrosive antifreeze liquid, water, etc.) via a large number of plates. A heat exchanger.
The primary side of the water heat exchanger 61 is connected to the pipes forming the natural water circulation path 70 described later, and the secondary side is connected to the pipes forming the cold/hot water circulation path 60 .

The temporary storage tank 62 is a hollow, airtight tank having side walls and upper and lower walls. A discharge port is provided on the lower side of the temporary storage tank 62 , and a pipe directed to the inlet of the radiator 20 via a pump 63 is connected to the discharge port.
The temporary reservoir tank 62 has a pipe inner diameter smaller than that on the inflow side so that the liquid to be supplied is temporarily reserved and then gradually discharged by a constant amount.
As another example, a water level sensor senses that the amount of water stored in the temporary storage tank 62 exceeds a predetermined amount, and an electric valve opens the discharge port according to this sensing state. It is also possible to adopt a mode in which the discharge port is opened by a float valve when the amount of water stored in 62 exceeds a predetermined amount.

The natural water circulation path 70 includes the above-described primary side portion of the radiator 20 and a groundwater reciprocating device 71 embedded in the ground, and forcibly transports the liquid on the primary side to the ground surface in the circulation flow path connected by piping. A pump 72 is provided. The pump 72 may be replaced with a submersible pump provided inside the underground water circulation device 71 as necessary.

The groundwater circulation device 71 is a device that sucks up the groundwater from the groundwater vein, exchanges the heat of this groundwater with the water heat exchanger 61, and then returns it to the groundwater vein. For example, an underground device disclosed in JP-A-2006-9335 can be used as the underground water circulation device 71 .
In addition, as another example, the groundwater circulation device 71 may be configured to pump river water or lake water and circulate it to the water heat exchanger 61, or to pump rainwater stored in a rainwater tank to the water heat exchanger 61. It is also possible to replace it with a configuration that distributes it to

Next, the characteristic functions and effects of the heat exchange auxiliary device 1 having the above configuration will be described in detail.
As shown in FIGS. 1(a) and 1(b), the heat exchange auxiliary device 1 having the above configuration is used by attaching a plurality of air discharge sections 50 to a plurality of heat source devices A. As shown in FIGS.

In the mounted state, cold/hot water is circulated through the cold/hot water circulation path 60, natural water is circulated through the natural water circulation path 70, and air is blown by the blower 10. and is heat-exchanged by the radiator 20 . After the heat exchange, the air passes through the first duct section 40 and is blown from each air discharge section 50 to the heat source side air heat exchanger a1 of the heat source device A. As shown in FIG.
Therefore, on the heat source device A side, better air heat exchange can be performed than when the heat source side air heat exchanger a1 is in direct contact with the outside air.

For example, when the heat source device A (the outdoor unit of the heat pump air conditioner) is in cooling operation, the groundwater recirculation device 71 pumps up groundwater at a temperature of about 15° C. and circulates it through the natural water circulation path 70 to heat the groundwater. is transmitted to the natural water circulation path 70 and the cold/hot water circulation path 60, if the temperature of the outside air is higher than the temperature of the groundwater, the outside air is cooled by the radiator 20, and the cold air is sent to each high temperature heat source side air heat exchanger a1 Since it can be sprayed, the cooling efficiency of the heat source equipment A can be improved.

During heating operation by the heat source equipment A, groundwater at a temperature of about 15°C is pumped up by the groundwater recirculation device 71 and circulated through the natural water circulation path 70, and the heat of this groundwater is transferred to the natural water circulation path 70 and the cold/hot water circulation path 60. When the temperature of the outside air is lower than the temperature of the groundwater, the outside air is heated by the radiator 20, and the hot air can be blown to each low-temperature heat source side air heat exchanger a1. Heating efficiency can be improved. It is known that the temperature of groundwater is kept constant to some extent throughout the year.

Further, according to the heat exchange auxiliary device 1, the air discharge section 50 is arranged so as to cover the air suction surface of the heat source side air heat exchanger a1. Therefore, when the heat source device A is operated for heating in winter, it is possible to prevent the low-temperature heat source side air heat exchanger a1 from being directly exposed to cold air. It is possible to prevent frequent repetition of useless defrost operation due to adhesion of snow.

Therefore, according to the heat exchange auxiliary device 1 of the present embodiment, there is no need to provide a plurality of auxiliary air heat exchangers corresponding to the plurality of heat exchangers as in the conventional technology, and an existing heat source can be installed with a simple structure. The heat exchange of the heat source side air heat exchanger a1 of the device A can be efficiently assisted, and the operating efficiency of each heat source device A can be improved.

<Second embodiment>
Next, a second embodiment will be described.
In addition, since the embodiments shown below are those in which the configuration is added or partially changed with respect to the heat exchange auxiliary device 1 described above, mainly the added and changed parts will be described in detail, and common Duplicate detailed descriptions of the parts are omitted.

The heat exchange auxiliary device 2 shown in FIG. A recovery pipe 110 for recovering air, a second duct portion 120 for returning the air recovered by the recovery pipe 110 to the suction side of the blower 10, and the amount of air returned to the suction side of the blower 10 by the second duct portion 120. is added with an air flow rate adjusting device 130 that adjusts the

A collecting pipe portion 30' is obtained by adding a suction portion 33 and a suction pipe 34 to the collecting pipe portion 30'.

The suction part 33 is formed in an enlarged tubular shape that covers the suction side of the fan 10 and expands toward the downstream side, and is integrally connected to the cylindrical part 31 .
The suction pipe 34 is a tubular body connected to the upstream side of the suction portion 33 in a straight pipe shape, and has an upstream suction port open.
In this suction pipe 34, a first damper device 131 and an outside air temperature sensor 134 are provided, which constitute an air flow control device 130, which will be described later.

The outside air temperature sensor 134 is, for example, a temperature sensor using a resistance temperature detector or the like, measures the outside air temperature on the upstream side of the first damper device 131, and sends an electric signal indicating the outside air temperature to a control circuit (not shown). send.

As other examples, there may be a mode in which a gap is provided between the suction portion 33 and the cylindrical portion 31, or a mode in which the suction portion 33 is omitted and the air discharged from the suction pipe 34 is blown to the blower 10. It is possible.

The recovery pipe 110 includes a reduced pipe portion 111 that covers the downstream side of the fan a2 of the heat source device A and shrinks toward the downstream side; It is integrally provided with a confluence pipe portion 112 connected so as to merge with each other.
According to the illustrated example, the contraction pipe portion 111 is configured separately from the air discharge portion 50, but as another example, the contraction pipe portion 111 and the air discharge portion 50 can be configured integrally.
According to the illustrated example, the confluence pipe portion 112 is formed in a straight pipe shape, but it may be formed in a manner suitable for site conditions, such as a bellows pipe or an elbow pipe.

The second duct portion 120 includes a long duct body 121 extending in the direction in which the plurality of heat source devices A are arranged, and a return pipe portion 122 connected to the downstream side of the duct body 121 and directed toward the suction side of the blower 10. and form a continuous air flow path.

The most upstream side of the duct body 121 (the portion on the right end side, not shown in FIG. 3) is closed.
The most downstream side of the duct main body 121 communicates with the outside air via a third damper device 133 that constitutes an air flow control device 130, which will be described later.

The return pipe portion 122 is a tubular body branched in a T shape from the peripheral wall upstream of the third damper device 133 on the downstream side of the duct main body 121 . The downstream end of the return pipe portion 122 is connected to the peripheral wall of the suction pipe 34 to form a flow path for returning the air in the second duct portion 120 to the suction pipe 34 .
A return air temperature sensor 122a and a second damper device 132, which will be described later, are provided in the return pipe portion 122. As shown in FIG.

The duct main body 121, the return pipe portion 122, the suction portion 33, the suction portion 33, and the like are thermally insulated in the same manner as the first duct portion 40 and the like.

The return air temperature sensor 122a is a temperature sensor using, for example, a resistance temperature detector, which measures the temperature of the air in the second duct section 120 and sends an electrical signal corresponding to the temperature to a control circuit (not shown). .

The air flow control device 130 includes a first damper device 131 provided upstream of the return pipe portion 122 in the suction pipe 34 and a return air temperature sensor 122a provided in the return pipe portion 122 downstream of the return air temperature sensor 122a. a second damper device 132, a third damper device 133 provided downstream of the branch point of the return pipe portion 122 in the duct body 121, and a control circuit (not shown). The first to third damper devices 131, 132, 133 are appropriately controlled.

Each of the first to third damper devices 131, 132, 133 includes a flow control plate p supported to rotate within the pipe, and an electric motor (not shown) that rotates the flow control plate p. It becomes The flow regulating plate p is positioned between a position that allows air to flow in the pipe (for example, a position that is substantially parallel to the central axis of the pipe) and a position that blocks the flow of air in the pipe (for example, a position that is substantially perpendicular to the central axis of the pipe). It rotates about 90 degrees between them. The electric motor is, for example, a stepping motor or a servomotor, and adjusts the rotation angle of the flow rate adjusting plate p according to commands from the control circuit.

Next, the characteristic functions and effects of the heat exchange auxiliary device 2 having the above configuration will be described in detail.
According to the heat exchange auxiliary device 2, similarly to the heat exchange auxiliary device 1 described above, it is possible to improve the operation efficiency of each heat source device A by utilizing the heat of groundwater.
Moreover, in the heat exchange auxiliary device 2 , the exhaust heat of each heat source device A can be reused by the second duct section 120 .

Specifically, when the first damper device 131 is fully closed, the second damper device 132 is fully opened, and the third damper device 133 is fully closed, the first An air circulation path is formed in the duct portion 40 and the second duct portion 120 (hereinafter referred to as circulation mode).
Further, when the first damper device 131 is fully opened, the second damper device 132 is fully closed, and the third damper device 133 is fully opened under the control of the air flow rate adjusting device 130, the external air sucked into the suction pipe 34 After passing through each heat source device A, it is discharged to the outside from the third damper device 133 without being returned to the suction pipe 34 side (hereinafter referred to as open mode).

A control circuit (not shown) initially puts the air flow control device 130 in the circulation mode during the cooling operation of the heat source device A, and compares the temperature of the outside air temperature sensor 134 with the temperature of the return air temperature sensor 122a.
When the temperature of the return air temperature sensor 122a is lower than the temperature of the outside air temperature sensor 134, the control circuit continues the circulation mode. Further, when the temperature of the return air temperature sensor 122a becomes higher than the temperature of the outside air temperature sensor 134, the air flow rate adjusting device 130 is set to the open mode to positively take in outside air having a relatively low temperature.

Further, when the heat source device A is operated for heating, if the temperature of the return air temperature sensor 122a becomes lower than the temperature of the outside air temperature sensor 134 during the circulation mode, the air flow rate adjusting device 130 is switched to the open mode. Switch to actively take in outside air with a relatively high temperature.

Therefore, according to the heat exchange auxiliary device 2, the exhaust heat of each heat source device A can be reused to effectively improve the operating efficiency of each heat source device A, and since less exhaust heat is released, the ambient environment can be improved. has little adverse effect on

According to the heat exchange auxiliary device 2, the first to third damper devices 131, 132, 133 are fully closed or fully opened. It is also possible to appropriately adjust the opening amounts of 132 and 133 respectively.

<Third embodiment>
In contrast to the heat exchange auxiliary device 1 described above, the heat exchange auxiliary device 3 shown in FIG. It is changed to an air discharge portion 50' having a different shape.

The heat source device B is an air-cooled heat pump chiller in which the air taken in from the three sides of the heat source side air heat exchanger b1, which is substantially U-shaped when viewed from above, is discharged upward by the fan b2 on the top side.

The air discharge section 50′ is formed by connecting a hood section 53 surrounding three side surfaces of the heat source side air heat exchanger b1 to the downstream side of the branch pipe section 51. As shown in FIG.
The hood part 53 is formed so as to cover all three air intake surfaces of the heat source side air heat exchanger b1 and to cover the upper side of the heat source side air heat exchanger b1 with the top plate 55 . The top plate 55 is provided with an exhaust hole 54 for the fan b2.

Therefore, according to the heat exchange auxiliary device 3 configured as described above, the operation efficiency of each heat source device A can be improved by using the heat of the groundwater, in the same manner as the heat exchange auxiliary device 1 described above.

As another example of the air discharge section 50' (see FIG. 4), it is possible to omit the top plate 55 and open the top substantially entirely.
Further, according to the illustrated example, the air discharge part 50' is formed so as to cover the three sides of the heat source device A, but as another example of this air discharge part 50', the four sides of the heat source device A can be It is also possible to form it so as to cover it.

In addition, in the heat exchange auxiliary devices 1, 2, and 3 described above, an axial fan is provided at an appropriate location in the first duct portion 40 and/or the second duct portion 120 to control the flow of air in the duct. You may make it assist.

In the above embodiment, the heat source devices A and B are heat pump type devices, but as other examples, these heat source devices can be cooling-only devices, heating-only devices, water heaters having a refrigeration cycle, and the like. be.

In the above embodiment, the auxiliary heat exchange device 1, 2 or 3 is configured to correspond to a plurality of heat source devices A or B of the same type, but as another example, it corresponds to a plurality of heat source devices of different types. It is also possible to configure a heat exchange auxiliary device by

Moreover, the present invention is not limited to the embodiments described above, and can be modified as appropriate without changing the gist of the present invention.

Reference Signs List 1, 2, 3: heat exchange auxiliary device 10: blower 20: radiator 30: collection pipe section 40: first duct section 50: air discharge section 60: cold/hot water circulation path 61: water heat exchanger 62: temporary storage tank 63 , 72: Pump 70: Natural water circulation path 71: Groundwater circulation device 120: Second duct portion 122a: Return air temperature sensor 130: Air flow rate adjustment device 131, 132, 133: First to third damper devices 134: Outside Air temperature sensor A, B: heat source device a1, b1: heat source side air heat exchanger a2, b2: fan

Claims (3)

A blower, a radiator for passing air received from the blower and exchanging heat with cold/hot water supplied from the outside, a first duct section for taking in and circulating the air that has passed through the radiator, and the first duct section. an air discharge unit connected to the downstream side of the and discharges the air in the first duct unit,
A heat exchange auxiliary device, wherein the air discharge part is provided so as to blow air onto an air intake surface of a heat source side air heat exchanger of the heat source equipment. 2. The heat exchange auxiliary device according to claim 1, wherein the air discharge part is formed in the vicinity of the air suction surface of the heat source side air heat exchanger of the heat source equipment so as to cover the air suction surface. . The radiator has a cold/hot water circulation path for circulating cold/hot water, and the cold/hot water circulation path includes a water heat exchanger that exchanges heat between the circulating cold/hot water and natural water, and a water heat exchanger that temporarily stores the circulating cold/hot water before flowing it. 3. A heat exchange auxiliary device according to claim 1, further comprising a temporary storage tank.

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