GB2583223A

GB2583223A - Device for supplying heating and hot water

Info

Publication number: GB2583223A
Application number: GB2008586.6A
Authority: GB
Inventors: Dae Park Su; Heoi Hu Chang; Keom Kim Jung
Original assignee: Kyungdong Navien Co Ltd
Current assignee: Kyungdong Navien Co Ltd
Priority date: 2018-01-18
Filing date: 2018-12-24
Publication date: 2020-10-21
Anticipated expiration: 2038-12-24
Also published as: KR20190088218A; GB202008586D0; WO2019143038A1; GB2583223B; RU2746509C1

Abstract

The purpose of the present invention is to provide a device for supplying heating and hot water, which is capable of preventing discharge of high-temperature warm water during the initial stage of warm-water usage, and which is capable of quickly adjusting the temperature of discharged warm water to a target warm-water temperature set by the user. A device for supplying heating and hot water, for the purpose of implementing the same, comprises: a first heat exchanger connected in parallel to a heating consumer so as to generate warm water through heat exchange with a heat medium supplied from a heat source; a second heat exchanger connected in series to the first heat exchanger (110) such that directly-supplied water is preheated by using the heat medium that has passed through the first heat exchanger, and the same then flows to the first heat exchanger; a mixing valve for mixing warm water discharged from the first heat exchanger with the directly-supplied water; and a controller for adjusting the amount of opening of the mixing valve.

Description

[DESCRIPTION]

[Invention Title] DEVICE FOR SUPPLYING HEATING AND HOT WATER [Technical Field] The present invention relates to a device for supplying heating and hot water, and more specifically, to a device for supplying heating and hot water configured to preheat a heat exchanger for supplying hot water to improve energy efficiency and quickly match a hot water temperature to a target hot water temperature.

[Background Art]

In the latest large apartment complexes or medium-to-large buildings, local and central heating systems have been installed. Therefore, instead of using individual heating and individual hot water supply methods, common heating equipment is installed for the total complex and high-temperature heat media are supplied to individual houses or floors through common pipe lines. Heating consumers such as rooms or living rooms are heated using the supplied heat media, and hot water generated by exchanging heat between the heat media and direct water is used.

The conventional pipe structure for local and central heating in which pipes are connected in an individual house is a 4-pipe type structure including a heating supply pipe, a heating return pipe, a hot water supply pipe, and a hot water return pipe. However, when the 4-pipe type structure is used, heating and hot water can be simultaneously used, but maintenance and new installation are very expensive. Accordingly, a 2-pipe type heating and hot water system is recently in use which includes two pipes which are a heating supply pipe and a heating return pipe through which a heat medium is supplied from and returns to a heat source.

In the case of the conventional 2-pipe heating and hot water system, the heat medium generated by a heat generation system is supplied to a hot water heat exchanger to generate hot water, and a heating apparatus connected to the hot water heat exchanger in series uses the heat medium discharged through the hot water heat exchanger to perform heating.

In this case, when the 2-pipe heating and hot water system is used to perform heating, since the heat medium generated by the heat generation system is supplied to the heating apparatus through the hot water heat exchanger, the high-temperature heat medium fills the hot water heat exchanger even in a case in which a user does not use hot water.

When the user uses hot water in such a state, direct water exchanges heat with the highly heated heat medium while passing through the hot water heat exchanger and the high-temperature hot water is discharged when the user initially uses hot water, and thus there is a problem in that the user is burned.

Although a method may be proposed in which an opening degree of a flow rate control valve provided in a pipe through which a heat medium flows is adjusted to prevent high-temperature hot water from being discharged, since hot water having a high temperature remaining in a hot water heat exchanger is immediately discharged when a user uses the hot water, there is a problem in that it is difficult to prevent the high-temperature hot water from being discharged only by adjusting the opening degree of the flow rate control valve.

[D sclo sure] [Technical Problem] The present invention is directed to providing a device for supplying heating 25 and hot water capable of preventing high-temperature hot water from being discharged when hot water is initially used and quickly matching a temperature of the discharged hot water to a target hot water temperature set by a user.

The present invention is also directed to providing a device for supplying heating and hot water capable of quickly providing hot water having a temperature desired by a user, thereby improving energy efficiency when the hot water is supplied.

The present invention is also directed to providing a device for supplying heating and hot water capable of quickly providing the hot water having a temperature desired by a user by causing a large amount of hot water to flow when the hot water is supplied, and preventing noise which may be generated due to an excessive amount of heating by causing a suitable amount of heating water to flow in a house when the heating is used.

The present invention is also directed to providing a device for supplying heating and hot water capable of preventing a large amount of water from leaking by detecting leakage and closing heating or hot water flow rate control valve.

[Technical Solution] One aspect of the present invention provides a device for supplying heating and hot water including a first heat exchanger connected to a heating consumer in parallel and configured to generate hot water by heat-exchanging direct water with a heat medium supplied from a heat source, a second heat exchanger connected to the first heat exchanger in series to preheat direct water using the heat medium passing through the first heat exchanger and to cause the direct water to flow to the first heat exchanger, a mixing valve configured to mix the hot water discharged from the first heat exchanger with the direct water, and a controller configured to adjust an amount of opening of the mixing valve.

In this case, the device for supplying heating and hot water may further include a direct water temperature sensor configured to measure a temperature of the direct water, a flow rate sensor configured to measure a flow rate of the direct water, a first hot water temperature sensor configured to measure a first hot water temperature of the hot water discharged from the first heat exchanger, and a second hot water temperature sensor configured to measure a second hot water temperature of hot water in which the direct water is mixed by the mixing valve, wherein the controller may adjust an opening degree of the mixing valve based on the flow rate of the direct water, the temperature of the direct water, the first hot water temperature, and the second hot water temperature.

The device for supplying heating and hot water may include a heating flow rate control valve configured to adjust a flow rate of the heat medium supplied to the heating consumer, and a hot water flow rate control valve configured to adjust a flow rate of the heat medium supplied to the first heat exchanger.

The hot water flow rate control valve may be disposed between and connected to the first heat exchanger and the second heat exchanger and may be provided in a first connection pipe through which the heat medium flows.

A heating return pipe, through which returning hot water heat-exchanged in the heating consumer flows, may be connected to the first connection pipe.

The heating flow rate control valve may be provided in a heating return pipe through which returning hot water heat-exchanged in the heating consumer flows. A maximum opening degree may be set in the heating flow rate control valve such that the heat medium flows at a maximum flow rate, and an opening degree of the heating flow rate control valve may be adjusted to correspond to a heating load 25 within a range of the maximum opening degree.

The device for supplying heating and hot water may include a leakage detecting sensor configured to detect a case in which water leaks from a path through which the heat medium, direct water, or hot water flows.

In the case in which the leakage detecting sensor detects the case in which the water leaks, the controller may close a flow rate control valve configured to adjust a flow rate of the heat medium.

The device for supplying heating and hot water may include a heat source supply pipe through which the heat medium is supplied from the heat source and include a first heat medium supply pipe and a second heat medium supply pipe branched off from the heat source supply pipe to the heating consumer and the first heat exchanger.

[Advantageous Effects] According to the present invention, since a heat exchanger for supplying hot water is connected to a heating consumer in parallel, high-temperature hot water can be prevented from being discharged when the hot water is initially used to prevent a user from being burned.

In addition, since a mixing valve is provided to mix hot water with direct water, a temperature of hot water to be discharged can quickly match a target hot water temperature set by the user.

In addition, since direct water can be preheated using heat of a heat medium passing through a first heat exchanger or heat of a heat medium returning from the heating consumer, a temperature of direct water can be quickly increased and energy efficiency can be improved.

In addition, since a constant flow rate function is provided in a heating flow rate control valve, when heating is performed, heating water s introduced into a house at a suitable flow rate so that noise which may be generated due to an excessive flow rate of the heating can be prevented.

In addition, since a leakage detecting sensor is provided in a device for supplying heating and hot water, a large amount of water can be prevented from leaking by quickly detecting water leakage occurring in a pipe and the like and closing a heating or hot water flow rate control valve. [Description of Drawings] FIG. 1 is a view illustrating a device for supplying heating and hot water according to the present invention.

FIG. 2 is a view illustrating a state in which a leakage detecting sensor provided in the device for supplying heating and hot water according to the present invention.

FIG. 3 is a view illustrating an operating state of the device for supplying heating and hot water of the present invention when heating is performed.

FIG. 4 is a view illustrating an operating state of the device for supplying heating and hot water of the present invention when hot water is supplied.

FIG. 5 is a view illustrating an operating state of the device for supplying heating and hot water of the present invention when heating is performed and hot water is supplied.

[Reference Numerals] 1: DEVICE FOR SUPPLYING HEATING AND HOT WATER 10: HEAT SOURCE SUPPLY PIPE 20: FIRST HEAT MEDIUM SUPPLY PIPE 21: HEATING RETURN PIPE 30: SECOND HEAT MEDIUM SUPPLY PIPE 31: FIRST CONNECTION PIPE 32: MIXED WATER RETURN PIPE 40: DIRECT WATER INLET PIPE 41: SECOND CONNECTION PIPE 42: HOT WATER SUPPLY PIPE 50: MIXING PIPE 110: FIRST HEAT EXCHANGER 120: SECOND HEAT EXCHANGER 131: HEATING FLOW RATE CONTROL VALVE 132: HOT WATER FLOW RATE CONTROL VALVE 133: MIXING VALVE 141: FIRST HEAT MEDIUM TEMPERATURE SENSOR 142: SECOND HEAT MEDIUM TEMPERATURE SENSOR 143: DIRECT WATER TEMPERATURE SENSOR 144: FIRST HOT WATER TEMPERATURE SENSOR 145: SECOND HOT WATER TEMPERATURE SENSOR 150: FLOW RATE SENSOR [Modes of the Invention] Hereinafter, the present nvention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, a device for supplying heating and hot water 1 of the present invention includes a first heat exchanger 110 connected to a heating consumer (not shown) in parallel and configured to generate hot water by heat-exchanging direct water with a heat medium supplied from a heat source, a second heat exchanger 120 connected to the first heat exchanger 110 in series to preheat direct water using the heat medium passing through the first heat exchanger 110 and cause the preheated direct water to flow to the first heat exchanger 110, a mixing valve 133 configured to mix the hot water discharged from the first heat exchanger 110 with the direct water, and a controller (not shown) configured to adjust an amount of opening of the mixing valve 133.

The heat medium supplied from the heat source is introduced into the device for supplying heating and hot water 1 through a heat source supply pipe 10.

The heat source supply pipe 10 branches off into a first heat medium supply pipe 20 connected to the heating consumer, and a second heat medium supply pipe 30 connected to the first heat exchanger 110. Accordingly, the heating consumer and the first and second heat exchangers 110 and 120 are connected in parallel. The heat medium supplied through the heat source supply pipe 10 may flow through any one of the first heat medium supply pipe 20 and the second heat medium supply pipe 30 or simultaneously flow through both of the first heat medium supply pipe 20 and the second heat medium supply pipe 30.

When the heat source supply pipe 10 is connected to the heating consumer and the first and second heat exchangers 110 and 120 in parallel, the heat medium supplied from the heat source may not be supplied to the first heat exchanger 110 and the second heat exchanger 120 when heating is performed. Accordingly, even when the user uses hot water after heating is performed, since a temperature of a heat medium in the first heat exchanger 110 and the second heat exchanger 120 is not high, and since high-temperature water is not discharged when the hot water is initially used, the user can be prevented from being burned.

Heat exchange is performed in the first heat exchanger 110 between a heat medium passing through the second heat medium supply pipe 30 and direct water heat-exchanged and preheated in the second heat exchanger 120.

Heat exchange is performed in the second heat exchanger 120 between a heat medium passing through the first heat exchanger 110 and the direct water, and the direct water is introduced into the first heat exchanger 110 and heated second after being preheated first. Accordingly, since a temperature of the direct water can be quickly increased, and heat of the heat medium passing through the first heat exchanger 110 may be used, energy efficiency can be improved.

In addition, when heating is performed, a heat medium heat-exchanged in the heating consumer and a temperature is decreased passes through the second heat exchanger 120 and flows to the heat source, and when hot water is supplied, direct water in the second heat exchanger 120 may be preheated using heat remaining in the heat medium, and thus energy efficiency can be improved.

Each of the first heat exchanger 110 and the second heat exchanger 120 may be provided as a plate shape heat exchanger in which heat exchange is performed while the heat medium and the direct water alternately flow between a plurality of stacked plates.

A first connection pipe 31 through which the heat medium flows and a second connection pipe 41 through which the direct water flows are disposed between and connected to the first heat exchanger 110 and the second heat exchanger 120.

In addition, the second heat medium supply pipe 30 into which a heat medium supplied from the heat source is introduced and a hot water supply pipe 42 from which the direct water heated by the heat medium is discharged as hot water are connected to the first heat exchanger 110 In addition, a direct water inlet pipe 40 into which the direct water is introduced and a mixed water return pipe 32 through which a heat medium heat-exchanged with the direct water and having a decreased temperature flows as a heat source are connected to the second heat exchanger 120.

A mixing pipe 50 configured to mix hot water with direct water is disposed between and connected to the direct water inlet pipe 40 and the hot water supply pipe 42, and a mixing valve 133 configured to adjust an amount of the direct water to be mixed with the hot water is provided in the mixing pipe 50.

The mixing valve 133 may be provided to adjust an opening degree thereof and adjust a mixing amount of the direct water. Since the mixing valve 133 mixes the direct water as described above, a temperature of high-temperature hot water passing through the first heat exchanger 110 may be lowered to a preset temperature. Accordingly, the preset target temperature of hot water can be quickly and correctly achieved.

A first heat medium temperature sensor 141 configured to measure a temperature of a heat medium supplied from the heat source is provided in the heat source supply pipe 10 and a second heat medium temperature sensor 142 configured to measure a temperature of a heat medium introduced into the second heat exchanger 120 is provided in the first connection pipe 31.

A direct water temperature sensor 143 configured to measure a temperature of direct water and a flow rate sensor 150 configured to measure of a flow rate of the direct water are provided in the direct water inlet pipe 40.

A first hot water temperature sensor 144, which measures a first hot water temperature of hot water discharged from the first heat exchanger 110, and a second hot water temperature sensor 145, which measures a second hot water temperature of hot water in a state in which the hot water passing through the first hot water temperature sensor 144 is mixed with direct water passing through the mixing pipe 50, are provided in the hot water supply pipe 42.

A heating flow rate control valve 131 configured to adjust a flow rate of a heat medium flowing through the heating consumer is provided in a heating return pipe 21 through which the heat medium heat-exchanged in the heating consumer flows to the second heat exchanger 120. In the present embodiment, the heating flow rate control valve 131 is illustrated to be provided in the heating return pipe 21 but may also be provided at another position in a path including a heating supply pipe 20 through which a heat medium flows when heating is performed.

The heating flow rate control valve 131 has a constant flow rate function. The constant flow rate function is a function of limiting a flow rate such that heating water is not supplied at a predetermined flow rate or more to heat a house.

That is, when heating areas of houses in which heating systems are installed are different, heating water is limited to flowing only at a predetermined flow rate according to an amount of required heating which is different from other houses so that the heating water can be prevented from flowing at an unnecessary flow rate and noise which may be generated due to an excessive flow rate of heating can be prevented.

In addition, a constant flow rate valve (not shown) configured to limit a flow rate of a heat medium introduced into the device for supplying heating and hot water 1 to a predetermined flow rate is also provided between the heat source and the mixed water return pipe 32.

In this case, when hot water is supplied, a high flow rate of a heat medium is required to quickly increase a temperature of the hot water, and when heating is performed, required heating can be supplied to houses even at a lower flow rate of the heat medium compared when the hot water is used.

Accordingly, a maximum flow rate set in the heating flow rate control valve 131 is less than a flow rate set in the constant flow rate valve provided between the heat source and the mixed water return pipe 32. The flow rate set in the constant flow rate valve is set based on when hot water is used, and the maximum flow rate set in the heating flow rate control valve 131 is set based on when heating is performed In this case, since the heating flow rate control valve 131 is provided in the heating return pipe 21, a flow rate may be adjusted within a flow rate range set in the heating flow rate control valve 131 only when heating is performed, and a heat medium supplied to the first heat exchanger 110 and the second heat exchanger 120 may flow at a high flow rate without being affected by the heating flow rate control valve 131 when hot water s supplied.

A hot water flow rate control valve 132 configured to adjust a flow rate of a heat medium flowing to the first heat exchanger 110 from the heat source is provided in the first connection pipe 31.

In the present embodiment, the hot water flow rate control valve 132 is illustrated to be provided in the first connection pipe 31 but may be provided at another position in a path including the second heat medium supply pipe 30 through which a heat medium flows when hot water is supplied.

The controller receives temperature information measured by the first heat medium temperature sensor 141, the second heat medium temperature sensor 142, the direct water temperature sensor 143, the first hot water temperature sensor 144, and the second hot water temperature sensor 145 and adjusts opening degrees of the heating flow rate control valve 131, the hot water flow rate control valve 132, and the mixing valve 133 according to the received temperature information.

Referring to FIG. 2, a leakage detecting sensor 160 configured to detect a case in which water leaks in a path through which the heat medium, the direct water, and the hot water flow may be provided in the device for supplying heating and hot water 1.

The device for supplying heating and hot water 1 may be provided under a sink, buried in a wall, or provided as a wall-mounted device. In a state in which the device for supplying heating and hot water 1 is installed as described above, when water leaks, the water may flow on an indoor floor. In this case, since the leakage detecting sensor 160 may detect the water leakage, the above-described problem can be prevented.

As the leakage detecting sensor 160 is installed close to a bottom of the device for supplying heating and hot water 1, when water leaks from the first heat exchanger 110, the second heat exchanger 120, and the pipes 10, 20, 21, 30, 31, 32, 40, 41, and 42 connected to the first heat exchanger 110 and the second heat exchanger 120, and falls to the bottom, the leakage detecting sensor 160 may detect the water leakage.

When the controller receives a water leakage occurrence signal from the leakage detecting sensor 160, the controller controls the heating flow rate control valve 131 and the hot water flow rate control valve 132 to be closed so as to prevent a large amount of water from leaking.

In addition, the heating flow rate control valve 131 and the hot water flow rate control valve 132 may also be formed to simultaneously be closed and generate an alarm indicating to the user that water is leaking.

An operation of heating will be described with reference to FIG. 3.

The user sets a desired heating temperature using a room controller (not shown) so that heating is performed.

An opening degree of the heating flow rate control valve 131 is set to correspond to the set heating temperature. In this case, a maximum flow rate of the heating flow rate control valve 131 is set to realize a constant flow rate function, and the opening degree is set to correspond to the set heating temperature within a range of the maximum flow rate.

The opening degree of the heating flow rate control valve 131 may be set to be proportional to a difference between temperatures of the heat medium measured by the first heat medium temperature sensor 141 and the second heat medium temperature sensor 142.

When the heating flow rate control valve 131 is opened, a heat medium supplied from the heat source sequentially passes through the heat source supply pipe 10 and the first heat medium supply pipe 20 and is supplied to the heating consumer. The heat medium heat-exchanged and having a decreased temperature in the heating consumer sequentially passes through the heating return pipe 21, the heating flow rate control valve 131, and the first connection pipe 31 and is introduced into the second heat exchanger 120.

In this case, since a state in which the hot water flow rate control valve 132 is closed is maintained, the heat medium supplied from the heat source does not flow toward the first heat exchanger 110. Accordingly, since the high-temperature heat medium is not introduced into the first heat exchanger 110, when hot water is supplied after heating is performed, high-temperature direct water can be prevented from being discharged.

A direct water path communicating with the direct water inlet pipe 40 is formed in the second heat exchanger 120, and a heat medium introduced into the second heat exchanger 120 is heat-exchanged with direct water flowing through the direct water path and flows to the heat source through the mixed water return pipe 32. When the device for supplying heating and hot water 1 is formed as described above, since direct water flowing through the direct water path may be preheated using heat remining in a heat medium passing through the heating consumer, energy efficiency can be improved. In addition, since direct water flowing through the direct water path in the second heat exchanger 120 is preheated, when hot water is used after heating is performed, the direct water is preheated by the second heat exchanger 120 and introduced into the first heat exchanger 110 so that a temperature of the direct water can be quickly increased.

An operation of supplying hot water will be described with reference to FIG. When the user uses hot water, direct water is introduced through the direct water inlet pipe 40, and when the flow rate sensor 150 detects a flow rate which is greater than a set flow rate, the hot water flow rate control valve 132 is opened so that a high-temperature heat medium is introduced into the first heat exchanger 110 from the heat source. In this case, a state in which the heating flow rate control valve 131 is closed is maintained.

The heat medium introduced into the first heat exchanger 110 sequentially passes through the first connection pipe 31 and the second heat exchanger 120 and flows toward the heat source through the mixed water return pipe 32.

The direct water is preheated first by heat-exchanging the direct water with the heat medium in the second heat exchanger 120 while passing through the direct water inlet pipe 40, the second heat exchanger 120, the second connection pipe 41, and the first heat exchanger 110, is preheated second by heat-exchanging the direct water with the heat medium in the first heat exchanger 110, and is discharged to the user through the hot water supply pipe 42.

In this case, a temperature of hot water desired by the user may be set as a target hot water temperature, and the controller may control an opening degree of the hot water flow rate control valve 132 to meet the target hot water temperature.

The opening degree of the hot water flow rate control valve 132 may be set according to a load of the hot water. The load of the hot water may be calculated based on a temperature of direct water measured by the direct water temperature sensor 143, a first hot water temperature measured by the first hot water temperature sensor 144, and a flow rate of the direct water measured by the flow rate sensor 150.

The opening degree of the hot water flow rate control valve 132 may be changed until a temperature of the hot water discharged through the hot water supply pipe 42 is adjusted to the target hot water temperature set by the user.

In this case, whether the target hot water temperature is achieved may be 25 determined based on a second hot water temperature measured by the second hot water temperature sensor 145, and the hot water may be mixed with the direct water by opening the mixing valve 133 so that the target hot water temperature may be quickly achieved. In addition, since the second heat exchanger 120 is preheated, when hot water is supplied when heating is performed, direct water may reach a high temperature state while passing through the second heat exchanger 120 and the first heat exchanger 110 and may be discharged, and when direct water is mixed with the high-temperature direct water using the mixing valve 133, high-temperature hot water may be prevented from being discharged.

An amount of opening of the mixing valve 133 may be set based on a flow rate of direct water measured by the flow rate sensor 150, a temperature of the direct water measured by the direct water temperature sensor 143, a first hot water temperature of hot water measured by the first hot water temperature sensor 144, and a second hot water temperature of the hot water measured by the second hot water temperature sensor 145.

That is, an amount of heat obtained by the direct water while the direct water passes through the first heat exchanger 110 and the second heat exchanger 120 and the flow rate of the direct water mixed through the mixing valve 133 to adjust the second hot water temperature to be the target hot water temperature may be calculated, and the amount of opening of the mixing valve 133 may be set to correspond to the calculated flow rate of the direct water.

Accordingly, in a case in which it is difficult to quickly meet the target hot water temperature desired by the user by only adjusting the opening degree of the hot water flow rate control valve 132, when the mixing valve 133 is used, the target hot water temperature desired by the user may be quickly achieved so that satisfaction of the user about a temperature of hot water may be improved.

In addition, since the direct water is preheated in the second heat exchanger 120 and heated in the first heat exchanger 110, a temperature of the direct water may be quickly increased, and since the direct water in the second heat exchanger 120 may be preheated using heat remaining in the heat medium passing through the first heat exchanger 110, energy efficiency can be improved.

In a case in which hot water is used, it is very important to quickly meet a target hot water temperature. When the hot water flow rate control valve 132 is opened to have a maximum opening degree, it is preferable that a heat medium passes through the hot water flow rate control valve 132 at a flow rate which is the same as a flow rate supplied to the house from the heat source. When the hot water flow rate control valve 132 is opened to have the maximum opening degree, since the heat medium flows at a flow rate greater than a constant flow rate set in the heating flow rate control valve 131, in a case in which a load of hot water is large, the hot water flow rate control valve 132 may be controlled to be opened to have the maximum opening degree so that a hot water temperature becomes the target hot water temperature.

An operation of supplying heating and hot water will be described with reference to FIG. 5.

When hot water is used while heating is performed, or heating is performed while hot water is used, the heating flow rate control valve 131 and the hot water flow rate control valve 132 are opened to correspond to a set temperature set by the User.

The heating flow rate control valve 131 is opened, and a heat medium supplied from the heat source sequentially flows through the heat source supply pipe 10, the first heat medium supply pipe 20, the heating consumer, the heating return pipe 21, the heating flow rate control valve 131, and the first connection pipe 31.

The hot water flow rate control valve 132 is opened, and the heat medium supplied from the heat source sequentially flows through the heat source supply pipe 10, the second heat medium supply pipe 30, the first heat exchanger 110, the first connection pipe 31, the second heat exchanger 120, and the mixed water return pipe 32.

In this case, direct water flows in the same path as the path described with reference to FIG. 3.

In a case in which heating and hot water are simultaneously used as described above, opening degrees of the heating flow rate control valve 131 and the hot water flow rate control valve 132 may be set to adjust a second hot water temperature first to a target hot water temperature set by the user.

Meanwhile, a preheating mode for preheating the first and second heat exchangers 110 and 120 may be performed for a set time such that the user may use hot water within a short time. When the first hot water temperature sensor 144 or the second hot water temperature sensor 145 measure a temperature of water in the hot water supply pipe 42, and the measured temperature is less than or equal to a set temperature, the hot water flow rate control valve 132 is opened to preheat water in the first and second heat exchangers 110 and 120. After that, when the user uses hot water, since the preheated water is discharged, the hot water may be quickly provided to the user. In this case, when a temperature of a heat medium measured by the first and second heat medium temperature sensors 141 and 142 instead of the first and second hot water temperature sensors 144 and 145 is less than or equal to the set temperature, the preheated mode may be performed.

In addition, an emergency operation mode may be performed in a case in which the room controller has broken down. When the room controller has broken down, heating and hot water may not be supplied. In this case, when a signal line of the room controller is short-circuited, the emergency operation mode may be performed such that the heating flow rate control valve 131 is opened to supply heating and the hot water flow rate control valve 132 is opened to supply hot water. When the emergency operation mode is performed, the heating flow rate control valve 131 may be controlled to maintain a continuously open state. In addition, a target hot water temperature which is a temperature of hot water discharged in the emergency operation mode is set in the controller, and when the flow rate sensor 150 detects that the user uses the hot water, the hot water flow rate control valve 132 may be controlled to be opened so that the hot water has the set target hot water temperature.

According to the above-described structure, since the first and second heat exchangers 110 and 120 for supplying hot water are connected to the heating consumer in parallel, high-temperature hot water can be prevented from being discharged to prevent the user from being burned when the hot water is initially used, and since the mixing valve 133 is provided to mix hot water with direct water, a temperature of hot water can quickly match a target hot water temperature set by the user. In addition, since direct water can be preheated, a temperature of the direct water can be quickly increased and energy efficiency can be improved.

As described above, the present invention is not limited to the above described embodiments, clear modifications of the present invention may be made by those skilled in the art without departing from the technical spirit of the present invention claimed by the appended claims, and the modifications fall within the scope of the present invention.

Claims

[CLAIMS] [Claim 1] A device for supplying heating and hot water comprising: a first heat exchanger connected to a heating consumer in parallel and configured to generate hot water by heat-exchanging direct water with a heat medium supplied from a heat source; a second heat exchanger connected to the first heat exchanger in series to preheat direct water using the heat medium passing through the first heat exchanger and to cause the direct water to flow to the first heat exchanger; a mixing valve configured to mix the hot water discharged from the first heat exchanger with the direct water; and a controller configured to adjust an amount of opening of the mixing valve. [Claim 2] The device for supplying heating and hot water of claim 1, further 15 comprising: a direct water temperature sensor configured to measure a temperature of the direct water; a flow rate sensor configured to measure a flow rate of the direct water; a first hot water temperature sensor configured to measure a first hot water 20 temperature of the hot water discharged from the first heat exchanger; and a second hot water temperature sensor configured to measure a second hot water temperature of hot water in which the direct water s mixed by the mixing valve, wherein the controller adjusts an opening degree of the mixing valve based on the flow rate of the direct water, the temperature of the direct water, the first hot water temperature, and the second hot water temperature.[Claim 3] The device for supplying heating and hot water of claim I, further comprising: a heating flow rate control valve configured to adjust a flow rate of the heat medium supplied to the heating consumer; and a hot water flow rate control valve configured to adjust a flow rate of the heat medium supplied to the first heat exchanger.[Claim 4] The device for supplying heating and hot water of claim 3, wherein the hot water flow rate control valve is disposed between and connected to the first heat exchanger and the second heat exchanger and is provided in a first connection pipe through which the heat medium flows.[Claim 5] The device for supplying heating and hot water of claim 4, wherein a heating return pipe, through which returning hot water heat-exchanged in the heating consumer flows, is connected to the first connection pipe.[Claim 6] The device for supplying heating and hot water of claim 3, wherein the heating flow rate control valve is provided in a heating return pipe through which returning hot water heat-exchanged in the heating consumer flows.[Claim 7] The device for supplying heating and hot water of claim 3, wherein: a maximum opening degree is set in the heating flow rate control valve such that the heat medium flows at a maximum flow rate; and an opening degree of the heating flow rate control valve is adjusted to correspond to a heating load within a range of the max mum opening degree.[Claim 8] The device for supplying heating and hot water of claim 1, further comprising a leakage detecting sensor configured to detect a case in which water leaks from a path through which the heat medium, direct water, or hot water flows. [Claim 9] The device for supplying heating and hot water of claim 8, wherein, in the case in which the leakage detecting sensor detects the case in which the water leaks, the controller closes a flow rate control valve configured to adjust a flow rate of the heat medium.[Claim 10] The device for supplying heating and hot water of claim 1, further comprising: a heat source supply pipe through which the heat medium is supplied from the heat source; and a first heat medium supply pipe and a second heat medium supply pipe 20 branched off from the heat source supply pipe to the heating consumer and the first heat exchanger.