JP5697474B2 - Hot water terminal cooling system - Google Patents

Description

  The present invention relates to a heating terminal cooling system using a hot water circulation system of a latent heat recovery type heat source machine.

2. Description of the Related Art Conventionally, as an indoor cooling device using radiant cooling heat, a method of cooling a floor surface or the like by circulating a refrigerant through an internal pipe of a surface member such as a ceiling material or a floor material is known. Although this method is superior to the method of blowing cold air into the room, there is a problem of corrosion of the building material due to the occurrence of dew condensation and generation of mold when the surface member of the room falls below the dew point of room air.
As a cooling device that solves such a problem, for example, the technique of Patent Document 1 has been proposed. The indoor cooling apparatus 100 according to this technique supplies the circulating water for cooling to the gas-liquid contact body 101 constituted by a perforated plate, a non-woven fabric, or the like through the outgoing side pipe 103 a and causes the cooling liquid to flow down on the gas-liquid contact body 101. The circulating water for cooling comes into gas-liquid contact with room air supplied below the gas-liquid contact body 101 via the duct 105, and in the process, the latent heat of evaporation is taken away by the contact air and cooled. Furthermore, it is returned to the room 102 side by the return pipe 103b, and the surface member 104 is cooled. On the other hand, the heat-recovered air is exhausted to the outdoors 108 via the fan 106 and the exhaust port 107.
Since this method uses latent heat of vaporization, the cooling water can be cooled to near the dew point temperature of the contact air, but it is not cooled below the dew point temperature, and there is no risk of condensation. Yes.

Japanese Patent Laid-Open No. 9-290121

  However, this system requires a dedicated device for bringing the circulating water into contact with the outside air. In addition, in order to share the winter heating system, additional equipment such as a circuit switching mechanism is required, which increases costs. Furthermore, since heat exchange is gas-liquid contact, that is, open heat exchange, there are problems such as deterioration of water quality due to exposure of the circulating water to the outside air and supply of water lost by evaporation.

The present invention is intended to solve such a problem, and provides a hot water terminal cooling system that does not require a dedicated device or equipment.
The gist of the present invention is as follows. That is, the hot water terminal cooling system according to the present invention is

(1) Hot water terminal cooling using a hot water heating system including a primary heat exchanger, a secondary heat exchanger, a systern, a latent heat recovery type heat source device including a hot water circulation system including a circulation pump, and a hot water terminal device A system,
The heat source machine further includes a first water spraying means including a water spray pipe for water spraying and a water spray nozzle, and
In the combustion stop state, the first water spraying means sprays cold water on the surface of the secondary heat exchanger, takes the latent heat of evaporation from the circulating water passing through the secondary heat exchanger, cools it, and cools the circulation. It is characterized in that it can be operated in cold water, supplying water to the hot water terminal.

(2) In the above invention, the hot water circulation system includes an in-machine circulation circuit, a forward side system, and a return side system,
The in-machine circulation system is configured by an in-machine circulation piping group that connects the systern, the circulation pump, and the primary heat exchanger,
The forward side system includes a high temperature forward side pipe and a low temperature forward side pipe, and
The high temperature forward piping is configured to branch from the primary heat exchanger outlet side of the in-machine circulation system and connect to the external high temperature terminal inlet side,
The low temperature forward piping is configured to branch from the circulation pump outlet side of the in-machine circulation system and connect to the external low temperature terminal inlet side,
The return side system includes a high temperature return side pipe connecting the outlet side of the high temperature terminal and the return side junction, a low temperature return side pipe connecting the outlet side of the low temperature terminal and the return side junction, the return side junction and the secondary And a return side merging pipe connecting the heat exchangers,
It is characterized by comprising.

(3) In the above invention, an in-machine circulation system opening / closing valve is further provided on the downstream side of the low-temperature forward piping in the path connecting the circulation pump of the in-machine circulation system and the primary heat exchanger,
In the cold water operation, the water stored in the cistern can be directly supplied to the low temperature terminal by bypassing the primary heat exchanger.

(4) In the above invention, the hot water circulation system further includes a bypass pipe connecting the low temperature forward pipe and the high temperature forward pipe, and a bypass opening / closing valve in the bypass pipe path,
In the cold water operation, the water stored in the cistern can be directly supplied to the high temperature terminal by bypassing the primary heat exchanger.

(5) In each of the above inventions, the circulating pump is configured to be capable of low-speed operation for the purpose of reducing the amount of heat release during the cold water operation.

(6) In each of the above inventions, a precooling heat exchanger is further provided for exchanging heat between the feed water passing through the spraying feed water pipe and the return circulating water flowing through the return side merge pipe. It is characterized by.

(7) In each of the above-mentioned inventions, the heat source machine includes a bath memorial system including an in-machine memorial pipe and a bath memorial heat exchanger connecting the high temperature forward side pipe and the high temperature return side pipe, and the bath memorial system. A water supply pipe passing through the heat exchanger, and
The cold water that passes through the water supply pipe and the circulating water that passes through the in-machine remedy pipe are configured to be able to exchange heat.

(8) In each of the above inventions, the heat source device further includes second water spraying means,
The second water spraying means branches from a drain pipe for draining condensed water accompanying latent heat recovery during heating operation and recirculates above the secondary heat exchanger, and drain recirculation And a second water spray nozzle on the end side of the drain recirculation pipe,
The drain generated at the time of water spraying by the first water spraying means is recirculated so that water can be sprayed again by the second water spraying means.

According to the present invention, without requiring a dedicated device for cooling the circulating water, the terminal device can be used for both winter heating and summer cooling with only one heat source unit, and the system can be simplified. Cost reduction is possible.
Moreover, since it is a hermetic heat exchange system, there is no risk of deterioration of the quality of circulating water due to contact with outside air, and there is an effect that replenishment of evaporated water is not necessary.

It is a figure showing composition of warm water terminal equipment cooling system 1 by a first embodiment. It is a figure which shows the warm water circulation path | route of the warm water circulation circuit. It is a figure which shows the warm water circulation path | route of the warm water circulation circuit. It is a figure which shows the warm water circulation path | route of the warm water circulation circuit. It is a figure which shows the aspect of the cold water circulation at the time of the floor heating panel cooling in 1st embodiment. It is a figure which shows the aspect of the cold water circulation at the time of cooling in a bathroom in 1st embodiment. It is a figure which shows the aspect of the cold water circulation at the time of floor heating panel cooling in 2nd embodiment (warm water terminal unit cooling system 20). It is a figure which shows the aspect of the cold water circulation at the time of cooling in the bathroom in 2nd embodiment. It is a figure which shows the structure of the hot water terminal device cooling system 30 by 3rd embodiment. It is a figure which shows the structure of the hot water terminal device cooling system 40 by 4th embodiment. It is a figure which shows the aspect of the cold water circulation at the time of the floor heating panel cooling in 4th embodiment. It is a figure which shows the structure of the hot water terminal cooling system 50 by 5th embodiment. It is a figure which shows the structure of the conventional indoor air-conditioning apparatus 100 using a warm water circulation system.

  Hereinafter, an embodiment of a hot water terminal cooling system according to the present invention will be described in more detail with reference to FIGS. In order to avoid redundant description, the same components are denoted by the same reference numerals in the respective drawings. Needless to say, the scope of the present invention is described in the claims and is not limited to the following embodiments.

<First embodiment>
Referring to FIG. 1, a hot water terminal cooling system 1 according to an embodiment of the present invention includes a latent heat recovery type heat source device including a water spraying means (first water spraying means) 7 for a secondary heat exchanger. 2, a floor heating panel 3 that is a low-temperature heat radiation terminal, a bathroom drying heater 4 that is a high-temperature heat radiation terminal, and hot water circulation systems 8 to 10 that connect these devices.
The heat source unit 2 includes a burner 5c, a combustion fan 5d, a primary heat exchanger 5b, a secondary heat exchanger (latent heat recovery heat exchanger) 5a, a heating combustion unit 5 in which an exhaust unit 5e is integrated, and hot water circulation piping. (Described later) as a main component. In addition, although illustration is abbreviate | omitted, the heat source machine 2 is provided with the control part which performs a hot-water supply system, a bath chase system, and operation control besides this.
The heat source device 2 further includes water spraying means 7 for spraying cold water on the surface of the heat exchanger above the secondary heat exchanger 5a. The water spraying means 7 includes a spray water supply pipe 7a, a water spray nozzle 7b, and a water spray on / off valve 7c. Below the secondary heat exchanger 5a, the condensed water accompanying the recovery of latent heat during heating and a drain pan 11a for collecting the unevaporated water described later, and the condensed water through the neutralizer 11b are drained (see FIG. And a drainage drainage means 11 constituted by a drainage pipe 11c leading to (not shown).

The hot water circulation system of the hot water terminal cooling system 1 is composed of a forward side system 8, a return side system 9, and an in-flight circulation system 10.
The in-machine circulation system 10 includes an open-type cistern 6, a circulation pump 10b, a primary heat exchanger 5b, and circulation pipes C1 to C3 connecting them. The systern 6 is a buffer tank against expansion of hot water in the pipe during heating operation, and is configured to drain outside through an overflow pipe (not shown) when the hot water rises above a predetermined water level. Further, the systern 6 is provided with a makeup water pipe 6a and a control valve 6b that branch from the water supply pipe 7a, and is configured so that the tank water level can be controlled within a certain range.

The forward side system 8 includes a high temperature system 8a and a low temperature system 8b. The high temperature system 8a includes the bathroom drying / heating device 4 and high-temperature forward piping H1 and H1 ′ branched from the circulation piping C1 at the branch point P1 and connected to the bathroom drying / heating device 4. An open / close valve V2 is disposed at the end of the high temperature delivery side pipe H1 ′. The low temperature system 8b includes the floor heating panel 3 and low temperature forward piping L1 and L1 ′ that branch from the circulation piping C3 at the branch point P2 and connect to the floor heating panel 3. A thermal valve V1 is provided at the end of the low temperature in-machine piping L1.
The return side system 9 includes a branching portion 9a and a collecting portion 9b. The branch portion 9a is configured by a high temperature return side pipe H2 and a low temperature return side pipe L2 from each terminal to the junction P3. In addition, the gathering portion 9b is configured by merging pipes J1 ′ and J1 that connect the merging point P3 and the secondary heat exchanger 5a, and a pipe J2 that connects the secondary heat exchanger 5a and the cistern 6.

  With the above configuration, during the heating operation in the system 1, the three types of hot water circulation circuits A to C shown in Table 1 and FIGS. 2 to 4 are formed. Then, hot water circulation is performed by one or a combination of three types of circulation circuits corresponding to the operation conditions of each terminal device, and heating operation is performed. The circulating hot water temperature is adjusted by controlling the amount of combustion in the heating combustion section 5.

(Floor heating panel cooling)
The hot water terminal cooling system 1 is configured as described above. Next, a mode of floor heating panel cooling of the present system in summer or the like will be described with reference to FIG. In this case, the operating state of each part is as shown in Table 2.

In this state, the circulating water circulates in the low-temperature circulation circuit B and the in-machine circulation circuit C as shown by the thick line in FIG. Further, cold water (tap water) supplied through the water supply pipe 7a is sprayed from the water spray nozzle 7b to the surface of the secondary heat exchanger 5a, and evaporates heat from the circulating water flowing in the secondary heat exchanger 5a. Evaporate. The evaporated water is discharged to the outside through the exhaust part 5e in association with the blowing by the circulation fan 4c. Non-evaporated water is dropped on the tray 11a, and finally led to a drain outlet (not shown) via the drain pipe 11c.
On the other hand, the circulating water deprived of the evaporation heat in the secondary heat exchanger 5a and cooled to the vicinity of the dew point temperature is supplied to the floor heating panel 3 via the low-temperature circulation circuit B, and cools the surface panel with cold heat. However, as described above, the evaporation temperature does not always become higher than the indoor dew point temperature, so that there is no condensation on the panel surface.
It should be noted that during the cold water operation, it is desirable to reduce the rotational speed of the circulation pump 10b than during the heating operation. Thereby, the fall of the cooling effect by pump heat_generation | fever can be avoided (same also in each following embodiment).

(Cooling in the bathroom)
Next, a mode of cooling in the bathroom will be described with reference to FIG. The operating state of each part is as shown in Table 3.

In this state, the circulating water circulates in the high-temperature circulation circuit A and the in-machine circulation circuit C as shown by the thick line in FIG. The aspect of water supply spraying on the surface of the secondary heat exchanger 5a is the same as in the case of floor heating panel cooling. On the other hand, the circulating water cooled to the room dew point temperature in the secondary heat exchanger 5a is supplied to the bathroom dryer 4 through the high-temperature circulation circuit A, where heat is exchanged with the air in the bathroom by the circulation fan 4c. Cooled circulating air enables cooling in the bathroom. As in the case of floor heating panel cooling, the evaporation temperature is always higher than the indoor dew point temperature, so there is no possibility of generation of mold in the bathroom due to the circulating air.
In addition, when it is necessary to use hot water such as mist sauna or clothes drying in the summer, it is possible to temporarily control the cold water operation and prioritize the hot water circulation.

<Second Embodiment>
Next, another embodiment of the present invention will be described with reference to FIGS. The configuration of the hot water terminal cooling system 20 according to this embodiment is different from the configuration of the above-described hot water terminal cooling system 1 in that an on-off valve (between the branch point P2 of the circulation pipe C3 and the primary heat exchanger 5b) In-machine circulation system on-off valve) 21 is provided. In addition, the bypass pipe 22 connecting the low-temperature forward pipe L1 and the upstream side of the branch point P1 of the high-temperature forward pipe H1, and the on-off valve (bypass on-off valve) 22a are provided in the bypass pipe 22 path. Since the other structure is the same as that of the hot water terminal cooling system 1, redundant description is omitted.

(Floor heating panel cooling)
Next, with reference to FIG. 7, the aspect of floor heating panel cooling in this embodiment is demonstrated. Regarding the operating state of each part, in addition to Table 2, the on-off valve 21 is closed and the on-off valve 22a is closed.
In this state, the circulating water circulates only in the low-temperature circulation circuit B as shown by the thick line in the figure, and no flow is formed in the in-machine circulation circuit C. The supply of water to the surface of the secondary heat exchanger 5a is the same as in the case of floor heating panel cooling.
In this embodiment, since the circulating water cooled by the secondary heat exchanger 5a does not pass through the primary heat exchanger 5b, there is no reheating by the outside air by the combustion fan 5d, and the cooling effect by the circulating cold water functions more effectively. To do.

(Bathroom cooling)
Next, with reference to FIG. 8, the aspect of bathroom cooling in this embodiment is demonstrated. In addition to Table 3, the operating state of each part is on-off valve 21 → closed and on-off valve 22a → opened.
In this state, the circulating water circulates only in the high-temperature circulation circuit A and no flow is formed in the in-machine circulation circuit C, as shown by the thick line in FIG. The supply of water to the surface of the secondary heat exchanger 5a is the same as in the case of floor heating panel cooling.
Also in this case, since the circulating water cooled by the secondary heat exchanger 5a does not pass through the primary heat exchanger 5b as in the case of the above-described floor heating panel cooling, there is no reheating by the blowing of the combustion fan 5d. In addition, the cooling effect in the bathroom by circulating cold water functions more effectively.

<Third embodiment>
Furthermore, another embodiment will be described with reference to FIG. The configuration of the hot water terminal cooling system 30 according to the present embodiment is different from the configuration of the hot water terminal cooling system 1 in that it includes a heat exchanger 31 that performs heat exchange between the return side system 9 and the water spraying means 7. It is that. Specifically, the heat exchanger 31 exchanges heat between the return-side circulating water that flows through the junction pipe J1 of the collecting portion 9b and the cold water that flows through the water supply pipe 7a. Since the other structure is the same as that of the hot water terminal cooling system 1, redundant description is omitted.
With this configuration, in the hot water terminal cooling system 30, the water returning to the secondary heat exchanger 5a via the junction pipe J1 is pre-cooled by the tap water flowing in the water supply pipe 7a, and thus supplied to the hot water terminal. The cold water temperature can be further reduced, and the cooling effect can be further enhanced.

<Fourth embodiment>
Furthermore, another embodiment of the present invention will be described with reference to FIGS. 10 (a) and 10 (b). The present embodiment relates to a system that cools circulating water using a bath remedy heat exchanger.
The difference of the configuration of the hot water terminal cooling system 40 according to the present embodiment from the configuration of the hot water terminal cooling system 30 described above is that the water supply pipe 44 is passed through the bath memory heat exchanger 41 of the bath memory system 45. It is configured as follows. The bath memorial system 45 includes a bath memorial heat exchanger 41, an in-machine memorial pipe 42, a memorial circulation pipe 43, and a bath circulation pump 43a. On-off valves 44a and 42a are provided in the water supply pipe 44 and the in-machine remedy pipe 42, respectively. In addition, in this embodiment, the heat exchanger 31 arrange | positioned in the above-mentioned embodiment becomes unnecessary. With this configuration, a memorial circuit D shown in Table 4 is formed during bath memorial.
Since the other structure is the same as that of the hot water terminal cooling system 1, the description thereof is omitted.

Next, with reference to FIG.10 (b), the aspect of floor heating panel cooling in this embodiment is demonstrated. In addition to Table 2, the operating state of each part is on-off valve 44a → open and on-off valve 42a → open.
In this state, the circulating water circulates in the memorial circuit D as shown by the thick line in FIG. Circulating water returning to the secondary heat exchanger 5a through the in-machine remedy pipe 42 is pre-cooled by heat exchange with cold water passing through the water supply pipe 44 in the bath remedy heat exchanger 41. Thereby, the cold-water temperature supplied to a hot-water terminal device can further be reduced similarly to the above-mentioned embodiment, and a cooling effect increases. In addition, by dropping the precooling water supply that passes through the water supply pipe 44 into a bathtub (not shown), the precooling water supply can be effectively used without being discarded.

<Fifth embodiment>
Furthermore, another embodiment of the present invention will be described with reference to FIG. The difference of the configuration of the hot water terminal cooling system 50 according to this embodiment from the above-described hot water terminal cooling system 1 is the configuration of the water spraying means. That is, the hot water terminal cooling system 50 includes the second water spraying means 51 in addition to the first water spraying means 7. The water spraying means 51 includes a recirculation pipe 51a branched from the drain pipe 11c, a water spray nozzle 51b, and a water spray on / off valve 51c. Further, a drain pump 52 and a drain opening / closing valve 53 are provided in the path of the drain pipe 11c. Since the other structure is the same as that of the hot water terminal cooling system 1, redundant description is omitted.
Next, the aspect of water spraying on the surface of the secondary heat exchanger 5a when the hot water terminal is cooled according to this embodiment will be described. In addition to Table 2 or Table 3, the operating state of each part is drain pump 52 → operation, on-off valve 51c → open, on-off valve 53 → closed.

In this state, the water supplied through the water supply pipe 7a is sprayed from the water spray nozzle 7b to the surface of the secondary heat exchanger 5a, and the unevaporated water is dropped on the tray 11a and branched through the drain pipe 11c. from the point P 9. Here, since the on-off valve 53 is closed, it is carried to the water spray nozzle 51b via the recirculation pipe 51a by the action of the drain pump 52 and sprayed again on the surface of the secondary heat exchanger 5a.
In addition, since the circulation form of cold water is the same as that of each above-mentioned embodiment, duplication description is abbreviate | omitted.
Since non-evaporated water can be repeatedly used by such supply water recirculation, the amount of drained water can be reduced and energy savings can be improved.

  In the present embodiment, the second water spraying means 51 has an example including the water spray nozzle 41b in addition to the water spray nozzle 7b. It is also possible to combine the circulation pipe 51a with the water supply pipe 7a to share the water spray nozzle.

  The present invention is widely applicable to a heating system provided with a latent heat recovery type heat exchanger regardless of the heat source and the kind of circulating refrigerant.

1, 20, 30, 40, 50 ... Warm water terminal cooling system 2 ... Latent heat recovery heat source 3 ... Floor heating panel 4 ... Bathroom drying heater 5 ... .... Heating combustion section 6 ... Open type systerns 7, 51 ... Water spraying means 7a, 44 ... Water spraying pipes 7b, 51b for spraying ... Water spray nozzle 7c , 51c... Water spraying opening and closing valve 8... Outward side system 9... Return side system 10... In-machine circulation system 11 ... Drain drainage means 21, 22 a, 42 a , 44a, 53, V2... On-off valve 22... Bypass piping 31... Heat exchanger 41 ... Bath bath heat exchanger 42. ··· Recirculation piping 43a ··· Bath circulation pump 45 ··· Bath bathing system 51a · · · Recirculation piping 52 ··· Renponpu V1 ···· Netsudoben

Claims (7)

This is a hot water terminal cooling system that uses a hot water heating system that includes a latent heat recovery type heat source device having a hot water circulation system including a primary heat exchanger, a secondary heat exchanger, a systern, and a circulation pump, and a hot water terminal. And
The hot water circulation system includes an in-flight circulation system, a forward side system, and a return side system,
The in-machine circulation system is configured by an in-machine circulation piping group that connects the cistern, the circulation pump, and the primary heat exchanger.
The forward side system includes a high temperature forward side pipe and a low temperature forward side pipe, and
The high temperature forward piping is configured to branch from the primary heat exchanger outlet side of the in-machine circulation system and connect to the external high temperature terminal inlet side,
The low temperature forward piping is configured to branch from the circulation pump outlet side of the in-machine circulation system and connect to the external low temperature terminal inlet side,
The return side system includes a high temperature return side pipe connecting the outlet side of the high temperature terminal and the return side junction, a low temperature return side pipe connecting the outlet side of the low temperature terminal and the return side junction, a return side junction and the secondary And a return side merging pipe connecting the heat exchangers,
The heat source machine further includes a first water spraying means including a water spray pipe for water spraying and a water spray nozzle, and
In the combustion stop state, the first water spraying means sprays cold water on the surface of the secondary heat exchanger, takes the latent heat of evaporation from the circulating water passing through the secondary heat exchanger, cools it, and cools the circulation. A hot water terminal cooling system configured to be capable of cold water operation using the hot water circulation system including the secondary heat exchanger for supplying water to the hot water terminal. An in-machine circulation system on / off valve on the downstream side of the branch to the low temperature forward side pipe in the path connecting the circulation pump of the in-machine circulation system and the primary heat exchanger,
The time in cold water operation, wherein the water in the cistern to bypass the primary heat exchanger, directly hot terminal device cooling system according to claim 1, characterized in that the supply configured to be capable of said cold terminal device. The hot water circulation system further includes a bypass pipe connecting the low temperature forward pipe and the high temperature forward pipe, and a bypass opening / closing valve in the bypass pipe path,
The hot water terminal cooling system according to claim 2 , wherein, during the cold water operation, the water stored in the cistern can be directly supplied to the high temperature terminal by bypassing the primary heat exchanger. The hot water terminal cooling system according to any one of claims 1 to 3 , wherein the circulation pump is configured to be capable of low-speed operation for the purpose of reducing a heat release amount during the cold water operation. The heat exchanger for pre-cooling for carrying out heat exchange of the feed water which passes through the inside of the water supply pipe for spraying, and the return circulating water which flows through the inside of the return side merge pipe is further provided. 4. The hot water terminal cooling system according to any one of 3 above. The heat source machine includes a bath remedy system including an in-machine remedy pipe and a bath remedy heat exchanger connecting the high temperature forward side pipe and the high temperature return side pipe, and water supply passing through the bath remedy heat exchanger A pipe, and
The hot water terminal cooling according to any one of claims 1 to 5 , wherein cold water passing through the water supply pipe and circulating water passing through the in-machine retreat pipe are configured to be able to exchange heat. system. The heat source machine further includes a second water spraying means,
The second water spraying means branches from a drain pipe for draining condensed water accompanying latent heat recovery during heating operation and recirculates above the secondary heat exchanger, and drain recirculation And a second water spray nozzle on the end side of the drain recirculation pipe,
Recycled drain generated during the water spraying by the first water spraying means, according to any one of claims 1 to 6, characterized by being configured to allow water again sprayed by said second water spraying means Hot water terminal cooling system.

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