JP2015183987A - Hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply system that enables enhancement of efficiency.SOLUTION: A hot water supply system includes: a gas burner 52 that is a heat supply source; a primary heat exchanger 54 for supplying heat from the gas burner 52 to an antifreezing solution flowing inside; a first pipe line 55 in which the antifreezing solution supplied from the primary heat exchanger 54 flows; a first hot water supply heat exchanger 60 that is arranged in the middle of the first pipe line 55 and enables heat exchange between the antifreezing solution flowing in the first pipe line 55 with water to be supplied to a bathroom 2; a secondary heat exchanger 56 for supplying heat that has not been supplied to the antifreezing solution in the primary heat exchanger 54 out of heat from the gas burner 52 to the antifreezing solution supplied from the first pipe line 55 and flowing inside; a second pipe line 57 in which the antifreezing solution supplied from the secondary heat exchanger 56 flows; and a second hot water supply heat exchanger 61 that is arranged in the middle of the second pipe line 57 and enables heat exchange between the antifreezing solution flowing in the second pipe line 57 and water to be supplied to a desiccant air conditioner 3.

Description

  The present invention relates to a technology of a hot water supply system that supplies a heat medium to hot water supply demand.

  Conventionally, the technology of the hot water supply system which supplies a heat medium to the hot water supply demand is known. For example, as described in Patent Document 1.

  Patent Document 1 discloses a hot water supply system including a heat source (gas burner), a primary heat exchanger disposed above the heat source, and a secondary heat exchanger disposed further above the primary heat exchanger ( A water heater) is disclosed. The heat medium (water) supplied from the outside flows through the secondary heat exchanger and the primary heat exchanger in order, and then is supplied to hot water supply demand (for example, bathroom, kitchen currant, etc.).

  At this time, the primary heat exchanger is warmed to a high temperature by the air warmed by the heat source. In addition, the secondary heat exchanger is also warmed by the heat of the air (exhaust gas) whose temperature has dropped after passing through the primary heat exchanger. The heat medium is first warmed in advance by the secondary heat exchanger, then warmed to a higher temperature by the primary heat exchanger, and supplied to the hot water supply demand. Thus, in the technique described in Patent Document 1, water is preliminarily warmed in the secondary heat exchanger using heat (exhaust heat) in the exhaust gas after passing through the primary heat exchanger. Thereby, water can be warmed efficiently.

  However, in such a hot water supply system, higher efficiency is desired.

JP 2004-198065 A

  The present invention has been made in view of the above situation, and a problem to be solved is to provide a hot water supply system capable of achieving high efficiency.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  Specifically, in claim 1, a first heat source that is a heat supply source, a primary heat exchanger that supplies heat from the first heat source to a heat medium that circulates inside, and a supply from the primary heat exchanger. Between the first conduit for circulating the heat medium to be circulated, and the heat medium provided in the middle of the first conduit and circulated through the first conduit and the heat medium supplied to the first hot water supply demand Supply heat to the heat medium in the primary heat exchanger out of the heat from the first heat source to the first hot water heat exchanger that can exchange heat with the heat medium that is supplied from the first pipe and circulates inside A secondary heat exchanger that supplies heat that has not been generated, a second pipe that circulates the heat medium supplied from the secondary heat exchanger, and a second pipe that is provided in the middle of the second pipe, A second hot water supply heat exchanger capable of exchanging heat between the heat medium flowing through the pipeline and the heat medium supplied to the second hot water supply demand; It is intended to comprise.

  In claim 2, the heat storage tank that stores the heat medium supplied to the primary heat exchanger, and the heat medium that is supplied from the second pipe and circulates inside the heat medium from the first heat source. , A tertiary heat exchanger for supplying heat not supplied to the heat medium in the primary heat exchanger and the secondary heat exchanger, and a heat medium supplied from the tertiary heat exchanger to the heat storage tank And a return line.

  According to a third aspect of the present invention, the heat storage tank further includes a plurality of second heat sources that supply heat to the heat medium stored in the heat storage tank, and the heat storage tank includes the plurality of second heat sources. A plurality of them are provided corresponding to the above.

  According to a fourth aspect of the present invention, at least a part of the heat medium supplied from the primary heat exchanger is transferred to the second hot water supply heat exchanger without passing through the first hot water supply heat exchanger and the secondary heat exchanger. And a bypass pipe line that can be circulated.

  In Claim 5, the bypass flow rate control valve which adjusts the flow volume of the heat medium which distribute | circulates the said bypass pipe, and the temperature of the heat medium supplied to said 1st hot water supply demand from said 1st hot water supply heat exchanger are detected. First temperature detecting means, second temperature detecting means for detecting the temperature of the heat medium supplied from the second hot water supply heat exchanger to the second hot water supply demand, the first temperature detecting means and the second And a control device for controlling the operation of the bypass flow rate control valve based on the temperature detected by the temperature detecting means.

  In Claim 6, the supply flow rate control valve which adjusts the flow volume of the heat medium supplied to the primary heat exchanger, and the heat medium supplied from the first hot water supply heat exchanger to the first hot water supply demand First temperature detection means for detecting temperature, second temperature detection means for detecting the temperature of the heat medium supplied from the second hot water supply heat exchanger to the second hot water supply demand, the first temperature detection means, And a control device that controls the operation of the supply flow rate control valve based on the temperature detected by the second temperature detection means.

  In claim 7, a bypass flow rate control valve for adjusting a flow rate of the heat medium flowing through the bypass pipe, a supply flow rate control valve for adjusting a flow rate of the heat medium supplied to the primary heat exchanger, First temperature detection means for detecting the temperature of the heat medium supplied from the first hot water supply heat exchanger to the first hot water supply demand, and heat supplied from the second hot water supply heat exchanger to the second hot water supply demand Second temperature detection means for detecting the temperature of the medium, and the operations of the bypass flow rate control valve and the supply flow rate control valve are controlled based on the temperatures detected by the first temperature detection means and the second temperature detection means. And a control device.

  In claim 8, the first hot water supply demand or the second hot water supply demand includes at least a desiccant air conditioner.

  As effects of the present invention, the following effects can be obtained.

  In claim 1, the heat medium deprived of heat in the first hot water supply heat exchanger is reheated using heat that has not been supplied to the heat medium in the primary heat exchanger, thereby achieving high efficiency. it can.

  In claim 2, the heat medium deprived of heat in the second hot water supply heat exchanger is reheated using heat that was not supplied to the heat medium in the primary heat exchanger and the secondary heat exchanger, and is transferred to the heat storage tank. By returning to this, the temperature of the heat medium in the heat storage tank can be raised, and as a result, high efficiency can be achieved.

  In Claim 3, the heat medium stored by the some heat storage tank provided corresponding to the some 2nd heat source can be utilized.

  In claim 4, it is possible to supply a large amount of heat to the second hot water supply demand by supplying the heat medium before deprived of heat in the first hot water supply heat exchanger to the second hot water supply heat exchanger. Become.

  In Claim 5, according to the temperature of the heat medium supplied to the 1st hot water supply demand and the 2nd hot water supply demand, adjusting the amount of heat supplied to the said 1st hot water supply demand and the 2nd hot water supply demand, respectively. it can.

  In claim 6, adjusting the total amount of heat supplied to the first hot water supply demand and the second hot water supply demand according to the temperature of the heat medium supplied to the first hot water supply demand and the second hot water supply demand. Can do.

  In claim 7, according to the temperature of the heat medium supplied to the first hot water supply demand and the second hot water supply demand, the amount of heat supplied to the first hot water supply demand and the second hot water supply demand, respectively, The total amount can be adjusted.

  In claim 8, high efficiency can be achieved in the hot water supply system for supplying heat to the desiccant air conditioner.

The schematic diagram which showed the whole structure of the hot water supply system which concerns on one Embodiment of this invention. Similarly, a partially enlarged view. The schematic diagram which showed the structure of the general hot water supply system. The schematic diagram which showed the mode of supply of the hot water in the hot water supply system which concerns on one Embodiment of this invention. The flowchart which showed an example of the control method of a hot-water supply system. The figure which showed the adjustment method of a bypass ratio and a total flow rate. The figure which showed the structure of the hot water supply system which concerns on a modification.

First, the hot water supply system 1 which concerns on one Embodiment of the hot water supply system which concerns on this invention is demonstrated using FIG.1 and FIG.2.
In the following description, water having a relatively low temperature is described as “water”, and water having a relatively high temperature is described as “hot water”. However, there is no substantial difference between water and hot water other than the difference in temperature.

  The hot water supply system 1 is provided at the customer's site to boil hot water using exhaust heat or the like and supply hot water according to hot water supply demand. Here, the “customer” means all things having a demand for hot water supply such as a house and various facilities. The “demand for hot water supply” means various facilities where heat (hot water or antifreeze) is used, such as a bathroom. In the present embodiment, the bathroom 2 and the desiccant air conditioner 3 will be described as examples of hot water supply demand.

  The bathroom 2 is one embodiment of the first hot water supply demand according to the present invention. Bathroom 2 is a room for bathing. The bathroom 2 is provided with a shower, a bathtub, and the like, and hot water is used by the shower.

  The desiccant air conditioner 3 is an embodiment of the second hot water supply demand according to the present invention. The desiccant air conditioner 3 is an air conditioner that dehumidifies moisture in the air using a desiccant (a hygroscopic agent). The desiccant air conditioner 3 can dehumidify by adsorbing moisture in the air to the hygroscopic agent. On the other hand, by heating the moisture absorbent that has adsorbed moisture in the air, moisture can be desorbed from the moisture absorbent, and the moisture absorbent can be regenerated (the moisture absorbent can again absorb moisture). it can. In this embodiment, the hygroscopic agent is warmed and regenerated using hot water.

  The hot water supply system 1 mainly includes a solar hot water system 10, a heat pump water heater 20, a fuel cell system 30, a hot water storage tank 40, an auxiliary heat source system 50, a supply flow rate control valve 70, a first water supply pipe 80, a first hot water supply pipe 90, A second water supply pipe line 100, a second hot water supply pipe line 110, a first hot water supply temperature sensor 120, a second hot water supply temperature sensor 130, and a control device 140 are provided.

  A solar hot water system 10 shown in FIG. 1 is an embodiment of a second heat source according to the present invention. The solar hot water system 10 collects and stores solar heat. The solar hot water system 10 mainly includes a heat collection panel 11.

  The heat collection panel 11 receives sunlight and collects solar heat, and raises the temperature of the heat medium by the heat. The heat collection panel 11 is formed in a flat plate shape so that it can receive sunlight on a wide surface. The heat collecting panel 11 is installed in a sunny place (for example, on the roof of a house). The temperature of the heat medium (antifreeze) flowing through the heat collection panel 11 rises due to the solar heat collected by the heat collection panel 11. The antifreeze liquid is supplied to a hot water storage tank 40 described later.

  The heat pump water heater 20 is an embodiment of the second heat source according to the present invention. The heat pump water heater 20 raises the temperature of the heat medium with a heat pump. The heat pump water heater 20 mainly includes a heat pump unit 21.

  The heat pump unit 21 generates heat by the heat pump and raises the temperature of the internal heat medium (antifreeze). The heat pump unit 21 supplies the antifreeze liquid whose temperature has risen to the hot water storage tank 40 described later.

  The fuel cell system 30 is an embodiment of the second heat source according to the present invention. The fuel cell system 30 generates power using fuel and raises the temperature of the heat medium by heat (exhaust heat) generated during the power generation. The fuel cell system 30 mainly includes a power generation unit 31.

  The power generation unit 31 extracts (generates) power using a fuel such as hydrogen. The electric power generated by the power generation unit 31 is supplied to various electric loads (electric appliances and the like) provided at the consumer. When the power generation unit 31 generates power, exhaust heat is generated at the same time. The power generation unit 31 raises the temperature of the internal heat medium (antifreeze liquid) by the generated exhaust heat, and supplies the antifreeze liquid to the hot water storage tank 40 described later.

  The hot water storage tank 40 is an embodiment of the heat storage tank according to the present invention. The hot water storage tank 40 is for storing heat. The hot water storage tank 40 is formed in a box shape having a space in which a heat medium (antifreeze) can be stored. The hot water storage tank 40 is connected to the heat collection panel 11, the heat pump unit 21, and the power generation unit 31. The hot water storage tank 40 can store heat by storing the warmed antifreeze supplied from the heat collection panel 11, the heat pump unit 21, and the power generation unit 31.

  The auxiliary heat source system 50 warms the supplied heat medium as necessary, and supplies the heat of the heat medium to the hot water supply demand. The auxiliary heat source system 50 mainly includes a casing 51, a gas burner 52, a supply pipe 53, a primary heat exchanger 54, a first pipe 55, a secondary heat exchanger 56, a second pipe 57, a tertiary heat exchanger 58, A return line 59, a first hot water supply heat exchanger 60, a second hot water supply heat exchanger 61, and a bypass line 62 are provided.

  The casing 51 accommodates each part of the auxiliary heat source system 50. The casing 51 is formed in a box shape having a space inside.

  The gas burner 52 is an embodiment of the first heat source according to the present invention. The gas burner 52 burns fuel supplied from outside and generates heat. The gas burner 52 is disposed at the lower part in the housing 51. Due to the heat generated in the gas burner 52, the air around the gas burner 52 becomes high temperature. The high-temperature air warms a primary heat exchanger 54, a secondary heat exchanger 56, and a tertiary heat exchanger 58 described later in order while rising.

  The supply line 53 supplies the antifreeze stored in the hot water storage tank 40 to the inside of the casing 51 (more specifically, a primary heat exchanger 54 described later). One end of the supply pipe 53 is connected to the hot water storage tank 40. The other end of the supply pipe 53 is provided so as to extend into the casing 51 and is connected to a primary heat exchanger 54 described later. A pump (not shown) is provided in the middle of the supply line 53. By driving the pump, the antifreeze liquid stored in the hot water storage tank 40 is supplied to the primary heat exchanger 54 via the supply line 53.

  The primary heat exchanger 54 supplies heat generated by the gas burner 52 to the antifreeze flowing through the inside. The primary heat exchanger 54 is formed by arranging piping so as to meander. The primary heat exchanger 54 is disposed above the gas burner 52. One end of the primary heat exchanger 54 is connected to the other end of the supply pipe 53. The primary heat exchanger 54 is heated by the high-temperature air that is heated by the gas burner 52 and rises, and supplies the heat to the antifreeze liquid that circulates inside. As a result, the temperature of the antifreeze flowing through the primary heat exchanger 54 increases.

  The first pipe 55 supplies the antifreeze liquid supplied from the primary heat exchanger 54 to the inside of the casing 51 again (more specifically, the secondary heat exchanger 56 described later) via the outside of the casing 51. To do. One end of the first pipeline 55 is connected to the other end of the primary heat exchanger 54. The other end of the first pipe 55 is connected to a secondary heat exchanger 56 described later. A midway portion of the first pipeline 55 is disposed outside the housing 51.

  The secondary heat exchanger 56 supplies heat generated by the gas burner 52 to the antifreeze flowing through the inside. The secondary heat exchanger 56 is formed by arranging piping so as to meander. The secondary heat exchanger 56 is disposed above the primary heat exchanger 54. One end of the secondary heat exchanger 56 is connected to the other end of the first pipeline 55. The secondary heat exchanger 56 is heated by the high-temperature air that is heated by the gas burner 52 and rises, and supplies the heat to the antifreeze liquid flowing inside. As a result, the temperature of the antifreeze flowing through the secondary heat exchanger 56 increases.

  The air that is heated by the gas burner 52 and rises reaches the secondary heat exchanger 56 via the primary heat exchanger 54. When air passes through the primary heat exchanger 54, a part of the heat of the air is supplied to the antifreeze liquid in the primary heat exchanger 54. For this reason, the temperature of the air reaching the secondary heat exchanger 56 is lower than the temperature of the air reaching the primary heat exchanger 54.

  The second pipeline 57 supplies the antifreeze liquid supplied from the secondary heat exchanger 56 to the inside of the casing 51 again (more specifically, a tertiary heat exchanger 58 described later) through the outside of the casing 51. To do. One end of the second conduit 57 is connected to the other end of the secondary heat exchanger 56. The other end of the second conduit 57 is connected to a tertiary heat exchanger 58 described later. A midway portion of the second pipeline 57 is disposed outside the housing 51.

  The tertiary heat exchanger 58 supplies the heat generated by the gas burner 52 to the antifreeze flowing inside. The tertiary heat exchanger 58 is formed by arranging piping so as to meander (not shown). The tertiary heat exchanger 58 is disposed above the secondary heat exchanger 56. One end of the tertiary heat exchanger 58 is connected to the other end of the second pipe 57. The tertiary heat exchanger 58 is heated by the high-temperature air that is heated by the gas burner 52 and rises, and supplies the heat to the antifreeze liquid flowing inside. As a result, the temperature of the antifreeze flowing through the tertiary heat exchanger 58 rises.

  The air that is heated by the gas burner 52 and rises reaches the tertiary heat exchanger 58 via the secondary heat exchanger 56. When the air passes through the secondary heat exchanger 56, a part of the heat of the air is supplied to the antifreeze liquid in the secondary heat exchanger 56. For this reason, the temperature of the air reaching the tertiary heat exchanger 58 is lower than the temperature of the air reaching the secondary heat exchanger 56.

  The return line 59 supplies (returns) the antifreeze supplied from the tertiary heat exchanger 58 to the hot water storage tank 40. One end of the return pipe 59 is connected to the other end of the tertiary heat exchanger 58. The other end of the return pipe 59 is provided so as to extend to the outside of the casing 51 and is connected to the hot water storage tank 40.

  The first hot water supply heat exchanger 60 performs heat exchange between the antifreeze liquid flowing through the first pipe 55 and the heat medium (water (hot water)) supplied to the bathroom 2. The first hot water supply heat exchanger 60 is provided in the middle of the first pipeline 55 (a portion located outside the housing 51).

  The second hot water supply heat exchanger 61 performs heat exchange between the antifreeze flowing in the second pipe 57 and the heat medium (water (hot water)) supplied to the desiccant air conditioner 3. The second hot water supply heat exchanger 61 is provided in the middle of the second pipe 57 (portion located outside the housing 51).

  The bypass line 62 is used to distribute the antifreeze supplied from the primary heat exchanger 54 to the second hot water supply heat exchanger 61 without passing through the first hot water supply heat exchanger 60 and the secondary heat exchanger 56. It is. One end of the bypass line 62 is connected to the middle part of the first line 55 (upstream side of the first hot water supply heat exchanger 60). The other end of the bypass line 62 is connected to the middle part of the second line 57 (upstream side of the second hot water supply heat exchanger 61). The antifreeze liquid that has flowed from the first pipeline 55 into the bypass pipeline 62 is supplied from the other end of the bypass pipeline 62 to the second pipeline 57. Accordingly, the antifreeze liquid is supplied to the second hot water supply heat exchanger 61 without passing through the first hot water supply heat exchanger 60 and the secondary heat exchanger 56. A bypass flow rate control valve 62 a is provided at one end of the bypass line 62 (connection portion with the first line 55).

  The bypass flow rate control valve 62 a is for adjusting the flow rate of the antifreeze liquid flowing through the bypass pipeline 62. The bypass flow rate control valve 62 a is provided at a connection portion between the bypass pipeline 62 and the first pipeline 55. The bypass flow rate control valve 62 a can adjust the flow rate of the antifreeze liquid flowing through the bypass pipeline 62 by adjusting the area of the flow path of the bypass pipeline 62. Thus, among the antifreeze supplied from the primary heat exchanger 54, the antifreeze supplied to the first hot water supply heat exchanger 60 via the first conduit 55 and the second hot water supply heat via the bypass conduit 62. The ratio of the antifreeze supplied to the exchanger 61 can be adjusted.

  The supply flow rate control valve 70 is for adjusting the flow rate of the antifreeze liquid flowing through the supply pipeline 53. The supply flow rate control valve 70 is provided in the middle of the supply pipeline 53. The supply flow rate control valve 70 can adjust the flow rate of the antifreeze liquid flowing through the supply pipeline 53 by adjusting the area of the supply pipeline 53. Thereby, the flow rate of the antifreeze supplied from the hot water storage tank 40 to the primary heat exchanger 54 can be adjusted.

  The first water supply pipe 80 supplies water (heat medium) to the first hot water supply heat exchanger 60. One end of the first water supply conduit 80 is connected to the first hot water supply heat exchanger 60.

  The first hot water supply pipe line 90 supplies hot water from the first hot water supply heat exchanger 60 to the bathroom 2. One end of the first hot water supply pipe line 90 is connected to the first hot water supply heat exchanger 60. The other end of the first hot water supply pipe line 90 is connected to the bathroom 2.

  The first hot water supply heat exchanger 60 supplies (heat exchanges) the heat of the antifreeze flowing through the first pipe 55 to the water supplied from the first water supply pipe 80. As a result, the temperature of the clean water rises and hot water is boiled. The hot water is supplied to the bathroom 2 through the first hot water supply pipe line 90.

  The second water supply pipe line 100 supplies water (heat medium) to the second hot water supply heat exchanger 61. One end of the second water supply pipe line 100 is connected to the second hot water supply heat exchanger 61.

  The second hot water supply pipe 110 supplies hot water from the second hot water supply heat exchanger 61 to the desiccant air conditioner 3. One end of the second hot water supply pipe 110 is connected to the second hot water supply heat exchanger 61. The other end of the second hot water supply pipe 110 is connected to the desiccant air conditioner 3.

  The second hot water supply heat exchanger 61 supplies (heat exchanges) the heat of the antifreeze liquid flowing through the second pipe 57 to the water supplied from the second water supply pipe 100. As a result, the temperature of the clean water rises and hot water is boiled. The hot water is supplied to the desiccant air conditioner 3 through the second hot water supply pipe 110.

  The first hot water temperature sensor 120 is an embodiment of the first temperature detecting means according to the present invention. The first hot water supply temperature sensor 120 detects the temperature of hot water supplied from the first hot water supply heat exchanger 60 to the bathroom 2. The first hot water supply temperature sensor 120 is provided in the middle of the first hot water supply pipe line 90. The first hot water supply temperature sensor 120 can detect the temperature of hot water supplied to the bathroom 2 by detecting the temperature of hot water flowing through the first hot water supply pipe line 90.

  The second hot water temperature sensor 130 is an embodiment of the second temperature detecting means according to the present invention. The second hot water supply temperature sensor 130 detects the temperature of hot water supplied from the second hot water supply heat exchanger 61 to the desiccant air conditioner 3. The second hot water supply temperature sensor 130 is provided in the middle of the second hot water supply pipe 110. The second hot water temperature sensor 130 can detect the temperature of hot water supplied to the desiccant air conditioner 3 by detecting the temperature of hot water flowing through the second hot water supply pipe 110.

  The control device 140 shown in FIG. 2 controls the operation of the hot water supply system 1 (particularly, the auxiliary heat source system 50). The control device 140 mainly includes an arithmetic processing device such as a CPU, a storage device such as a RAM and a ROM, an input / output device such as an I / O, and a display device such as a monitor. Various information, programs, and the like for controlling the operation of hot water supply system 1 are stored in advance in control device 140.

The control device 140 is connected to the bathroom 2 and can receive a signal related to the amount of heat (temperature and amount of hot water) required in the bathroom 2.
The control device 140 is connected to the desiccant air conditioner 3 and can receive a signal relating to the amount of heat (temperature and amount of hot water) required in the desiccant air conditioner 3.
The control device 140 is connected to the first hot water supply temperature sensor 120 and can receive a signal related to the temperature of hot water supplied to the bathroom 2.
The control device 140 is connected to the second hot water supply temperature sensor 130 and can receive a signal relating to the temperature of the hot water supplied to the desiccant air conditioner 3.
The control device 140 is connected to the bypass flow rate control valve 62a and can control the operation of the bypass flow rate control valve 62a (the flow rate of the antifreeze liquid flowing through the bypass pipeline 62).
The control device 140 is connected to the supply flow rate control valve 70 and can control the operation of the supply flow rate control valve 70 (the flow rate of the antifreeze liquid flowing through the supply pipeline 53).

  Below, the outline | summary of operation | movement of the hot water supply system 1 comprised as mentioned above is demonstrated using FIG.1 and FIG.2.

  The antifreeze liquid heated by the solar hot water system 10, the heat pump water heater 20 and the fuel cell system 30 is stored in the hot water storage tank 40. The antifreeze is supplied to the first hot-water supply heat exchanger 60 and the second hot-water supply heat exchanger 61 of the auxiliary heat source system 50 in response to demand for hot water from the hot water supply demand (bathroom 2 and desiccant air conditioner 3). In the first hot water supply heat exchanger 60 and the second hot water supply heat exchanger 61, the heat of the antifreeze liquid is supplied to the clean water, and the hot water (hot water) whose temperature has risen is supplied to the bathroom 2 and the desiccant air conditioner 3, respectively. Is done.

  At this time, if the temperature of the antifreeze liquid in the hot water storage tank 40 is low, the auxiliary heat source system 50 warms the antifreeze liquid. Specifically, the antifreeze supplied from the hot water storage tank 40 is heated in the primary heat exchanger 54 and then supplied to the first hot water supply heat exchanger 60.

  The antifreeze liquid that has passed through the first hot water supply heat exchanger 60 is heated again in the secondary heat exchanger 56 and then supplied to the second hot water supply heat exchanger 61. At this time, if necessary, a part of the antifreeze liquid heated in the primary heat exchanger 54 is supplied to the second hot water supply heat exchanger 61 through the bypass line 62.

  In this way, when the temperature of the antifreeze liquid in the hot water storage tank 40 is not sufficiently high with respect to the demand for hot water from the hot water supply demand, the antifreeze liquid is warmed in the auxiliary heat source system 50. By supplying the antifreeze liquid to the first hot water supply heat exchanger 60 and the second hot water supply heat exchanger 61, heat sufficient for the hot water supply demand (temperature and amount of hot water according to the demand) can be supplied.

  Further, the antifreeze liquid flowing through the second hot water supply heat exchanger 61 is warmed again in the tertiary heat exchanger 58 and then returned to the hot water storage tank 40. In this way, heat (exhaust heat) that has not been supplied to the antifreeze liquid by the primary heat exchanger 54 and the secondary heat exchanger 56 can be supplied to the antifreeze liquid that is returned to the hot water storage tank 40. As a result, the temperature of the antifreeze liquid in the hot water storage tank 40 can be raised using the exhaust heat, and the energy efficiency can be improved.

  Below, using FIG.3 and FIG.4, it is an example about the difference in the mode of the hot water supply by the conventional general hot water supply system (auxiliary heat source system 250) and the hot water supply system 1 (auxiliary heat source system 50) which concerns on this embodiment. I will give you a description.

  First, the configuration of a general hot water supply system (particularly, the auxiliary heat source system 250) will be briefly described with reference to FIG.

  The auxiliary heat source system 250 includes a supply heat exchanger 263, a gas burner 252, a supply line 253, a primary heat exchanger 254, and a secondary heat exchanger 256.

  The supply heat exchanger 263 is supplied with clean water via a non-illustrated clean water pipe. The supply heat exchanger 263 supplies the heat of the antifreeze stored in the hot water storage tank 40 to the clean water. The clean water is supplied to the secondary heat exchanger 256 via the supply line 253. The clean water that has circulated through the secondary heat exchanger 256 is supplied to the primary heat exchanger 254 disposed below the secondary heat exchanger 256. The clean water flowing through the primary heat exchanger 254 and the secondary heat exchanger 256 is heated by heat (hot air) from the gas burner 52 disposed below the primary heat exchanger 254.

  The hot water (hot water) that has circulated through the primary heat exchanger 254 is branched and supplied to a first hot water supply pipe 290 connected to the bathroom 2 and a second hot water supply pipe 310 connected to the desiccant air conditioner 3. Is done. The hot water flowing through the first hot water supply pipe 290 is mixed with hot water via the first water supply pipe 280, and the hot water is supplied to the bathroom 2. The hot water flowing through the second hot water supply pipe 310 is mixed with clean water through the second water supply pipe 300, and the hot water is supplied to the desiccant air conditioner 3.

  Next, when supplying hot water to the hot water supply demand (bathroom 2 and desiccant air conditioner 3) using the above-described general hot water supply system and the hot water supply system 1 according to this embodiment, The difference in temperature and flow rate will be described. As a premise for the following explanation, it is assumed that 40 (° C.) hot water is supplied 120 (L) at a time to the bathroom 2 and the desiccant air conditioner 3, respectively. Further, the temperature of the antifreeze liquid (water) supplied from the hot water storage tank 40 to the auxiliary heat source system 50 (auxiliary heat source system 250) is 20 (° C.), the temperature of clean water is 15 (° C.), and the primary heat exchanger 54 (primary heat exchanger 54). It is assumed that the temperature of the antifreeze liquid (hot water) flowing through the heat exchanger 254) is 75 (° C.).

  First, the state of supplying hot water to hot water supply demand using a general hot water supply system will be described with reference to FIG. In the auxiliary heat source system 250, the temperature of the air supplied from the gas burner 252 to the primary heat exchanger 254 is 1500 (° C.), and the air supplied to the secondary heat exchanger 256 via the primary heat exchanger 254. The temperature is assumed to be 200 (° C.).

  In this case, 20 (° C.) and 100 (L) of clean water is supplied to the supply pipe 253 by the supply heat exchanger 263. The clean water is heated to 75 (° C.) by passing through the secondary heat exchanger 256 and the primary heat exchanger 254 in order. The tap water (hot water) is branched into two, and 50 (L) is supplied to the first hot water supply pipe 290 and the second hot water supply pipe 310, respectively.

The hot water supplied to the first hot water supply pipe line 290 is mixed with 15 (° C.) and 70 (L) clean water via the first water supply pipe line 280 to 40 (° C.) and 120 (L). The hot water is supplied to the bathroom 2.
Moreover, the hot water supplied to the second hot water supply pipe 310 is mixed with the top water of 15 (° C.) and 70 (L) through the second water supply pipe 300, and 40 (° C.) and 120 (L ) Is supplied to the desiccant air conditioner 3.

  As described above, in the hot water supply system shown in FIG. 3, when 120 (L) hot water of 40 (° C.) is supplied to the bathroom 2 and the desiccant air conditioner 3 respectively, 20 (° C.) and 100 (L) hot water is supplied. (Water that is supplied to the secondary heat exchanger 256 via the supply line 253) is required.

  Next, a state where hot water is supplied to the hot water supply demand using the hot water supply system 1 according to the present embodiment will be described with reference to FIG. In the auxiliary heat source system 50, the temperature of the air supplied from the gas burner 52 to the primary heat exchanger 54 is 1500 (° C.), and the air supplied to the secondary heat exchanger 56 via the primary heat exchanger 54. The temperature of the air is 200 (° C.), and the temperature of the air supplied to the tertiary heat exchanger 58 via the secondary heat exchanger 56 is 80 (° C.).

  In this case, 20 (° C.) and 100 (L) antifreeze are supplied from the hot water storage tank 40 to the supply line 53. The antifreeze liquid is heated to 75 (° C.) through the primary heat exchanger 54. The antifreeze is branched by the bypass flow rate control valve 62 a, and a part (50 (L)) is supplied to the first hot water supply heat exchanger 60 through the first pipe 55. The other antifreeze liquid (30 (L)) is supplied to the second pipeline 57 via the bypass pipeline 62.

  In the 1st hot water supply heat exchanger 60, the heat of the antifreeze supplied via the 1st pipe 55 is the upper water (15 (degreeC), 120 (L)) supplied via the 1st water supply pipe 80 Supplied to. Thus, the clean water (hot water) heated to 40 (° C.) is supplied to the bathroom 2.

  Further, the antifreeze liquid (15 (° C.), 50 (L)) whose temperature has been lowered through the first hot water supply heat exchanger 60 is warmed to 40 (° C.) through the secondary heat exchanger 56. The antifreeze supplied through the bypass pipe 62 is mixed with the antifreeze, and the antifreeze that has become 53 (° C.) and 80 (L) is supplied to the second hot water supply heat exchanger 61 through the second pipe 57. Supplied with.

  In the 2nd hot water supply heat exchanger 61, the heat of the antifreeze supplied via the second pipe 57 is the clean water (15 (° C.), 120 (L)) supplied via the second clean water pipe 100. Supplied to. Thus, the clean water (hot water) heated to 40 (° C.) is supplied to the desiccant air conditioner 3.

  Further, the antifreeze liquid (15 (° C.), 80 (L)) whose temperature has been lowered through the second hot water supply heat exchanger 61 is warmed to 25 (° C.) through the tertiary heat exchanger 58. The antifreeze liquid is returned to the hot water storage tank 40 via the return line 59.

  Thus, in the hot water supply system 1 according to the present embodiment, when supplying 40 (° C.) hot water 120 (L) to the bathroom 2 and the desiccant air conditioner 3 respectively, 20 (° C.) and 80 (L) antifreeze liquid. (Antifreeze supplied via the supply line 53) is required.

  A general hot water supply system (see FIG. 3) and a hot water supply system 1 according to the present embodiment (see FIG. 4) will be compared. In a general hot water supply system, 100 (L) of water at 20 (° C.) is required (supplied to the secondary heat exchanger 256 and the like via the supply pipe 253), whereas the hot water supply according to the present embodiment In the system 1, 80 (L) of antifreeze at 20 (° C.) is sufficient (if it is supplied to the primary heat exchanger 54 and the like via the supply line 53). That is, the hot water supply system 1 can improve energy efficiency by about 20 (%). Furthermore, in the hot water supply system 1, since the antifreeze liquid returned to the hot water storage tank 40 can be warmed by the tertiary heat exchanger 58, the amount of heat stored in the hot water storage tank 40 can be increased. Thereby, energy efficiency can be improved more.

  Below, an example of the control method of the hot water supply system 1 comprised as mentioned above is demonstrated using FIG.5 and FIG.6.

In step S101 shown in FIG. 5, the control device 140 determines whether or not the amount of heat required in the bathroom 2 is greater than zero. That is, the control device 140 determines whether heat (hot water) is required in the bathroom 2.
When it is determined that heat (hot water) is requested in the bathroom 2, the control device 140 proceeds to step S102.
When it is determined that heat (hot water) is not requested in the bathroom 2, the control device 140 proceeds to step S104.

In step S102, the control device 140 determines whether the amount of heat required in the desiccant air conditioner 3 is greater than zero. That is, the control device 140 determines whether heat (hot water) is required in the desiccant air conditioner 3.
When it is determined that the desiccant air conditioner 3 requires heat (hot water), the control device 140 proceeds to step S103.
When it is determined that the desiccant air conditioner 3 does not require heat (hot water), the control device 140 proceeds to step S106.

In step S103, the control device 140 determines a method for adjusting the bypass ratio and the total flow rate.
Here, the “bypass ratio” is the ratio of the antifreeze liquid that branches from the first pipe 55 and flows through the bypass pipe 62 to the antifreeze supplied from the primary heat exchanger 54 to the first pipe 55. means.
The “total flow rate” is the flow rate of the antifreeze liquid supplied from the hot water storage tank 40 to the primary heat exchanger 54 via the supply pipe line 53.

  The control device 140 determines the adjustment method of the bypass ratio and the total flow rate according to the table shown in FIG. The table shown in FIG. 6 shows the temperature of hot water supplied to the bathroom 2 (temperature detected by the first hot water supply temperature sensor 120) and the temperature of hot water supplied to the desiccant air conditioner 3 (second hot water supply temperature sensor 130). The method of adjusting the bypass ratio and the total flow rate is determined in accordance with the relationship with the temperature detected by (1). Hereinafter, the contents of the table shown in FIG. 6 will be described.

  The control device 140 calculates an appropriate temperature (target temperature) of hot water to be supplied to the bathroom 2 and the desiccant air conditioner 3 from the amount of heat required in the bathroom 2 and the desiccant air conditioner 3. And the control apparatus 140 is the temperature of the hot water actually supplied to the bathroom 2 and the desiccant air conditioner 3 being appropriate (substantially the same temperature as the target temperature), higher or lower than the target temperature. Determine whether. Hereinafter, the temperature of hot water actually supplied to the bathroom 2 is referred to as “bathroom temperature”, and the temperature of hot water actually supplied to the desiccant air conditioner 3 is referred to as “desiccant temperature”.

When it is determined that the bathroom temperature is higher than the target temperature and the desiccant temperature is higher than the target temperature (see P1 in FIG. 6), the control device 140 determines to reduce the total flow rate.
When it is determined that the bathroom temperature is higher than the target temperature and the desiccant temperature is appropriate (see P2 in FIG. 6), the control device 140 determines to reduce the total flow rate and increase the bypass ratio.
When it is determined that the bathroom temperature is higher than the target temperature and the desiccant temperature is lower than the target temperature (see P3 in FIG. 6), the control device 140 determines to increase the bypass ratio.

When it is determined that the bathroom temperature is appropriate and the desiccant temperature is higher than the target temperature (see P4 in FIG. 6), the control device 140 determines to reduce the total flow rate and reduce the bypass ratio.
When it is determined that the bathroom temperature is appropriate and the desiccant temperature is appropriate (see P5 in FIG. 6), the control device 140 does not adjust (maintain as it is) the total flow rate and the bypass flow rate. decide.
When it is determined that the bathroom temperature is appropriate and the desiccant temperature is lower than the target temperature (see P6 in FIG. 6), the control device 140 determines to increase the total flow rate and increase the bypass ratio.

When it is determined that the bathroom temperature is lower than the target temperature and the desiccant temperature is higher than the target temperature (see P7 in FIG. 6), the control device 140 determines to reduce the bypass ratio.
When it is determined that the bathroom temperature is lower than the target temperature and the desiccant temperature is appropriate (see P8 in FIG. 6), the control device 140 determines to increase the total flow rate and reduce the bypass ratio.
When it is determined that the bathroom temperature is lower than the target temperature and the desiccant temperature is lower than the target temperature (see P9 in FIG. 6), the control device 140 determines to increase the total flow rate.

  By adjusting the total flow rate and the bypass ratio according to the table shown in FIG. 6, the bathroom temperature and the desiccant temperature can be brought close to the target temperature.

  After performing the process of step S103, the control device 140 proceeds to step S107.

In step S104 transferred from step S101 shown in FIG. 5, the control device 140 determines a method for adjusting the bypass ratio. Specifically, the control device 140 sets the bypass ratio to 100 (%), that is, distributes all the antifreeze supplied from the primary heat exchanger 54 to the first pipeline 55 to the bypass pipeline 62. To decide.
After performing the process of step S104, the control device 140 proceeds to step S105.

In step S105, the control device 140 determines whether the amount of heat required in the desiccant air conditioner 3 is greater than zero. That is, the control device 140 determines whether heat (hot water) is required in the desiccant air conditioner 3.
When it is determined that the desiccant air conditioner 3 requires heat (hot water), the control device 140 proceeds to step S107.
When it is determined that the desiccant air conditioner 3 does not require heat (hot water), the control device 140 proceeds to step S101.

In step S106 transferred from step S102, the control device 140 determines a method for adjusting the bypass ratio. Specifically, the control device 140 sets the bypass ratio to 0 (%), that is, all the antifreeze supplied from the primary heat exchanger 54 to the first pipeline 55 is passed to the first hot water supply heat exchanger 60. It is determined that the antifreeze liquid is not supplied to the bypass pipe line 62.
After performing the processing of step S106, the control device 140 proceeds to step S107.

In step S107 transferred from step S103, step S105, or step S106, the control device 140 actually adjusts the bypass ratio and the total flow according to the determined bypass ratio and the total flow adjustment method.
The control device 140 can adjust the bypass ratio by controlling the operation of the bypass flow rate control valve 62a. Further, the control device 140 can adjust the total flow rate by controlling the operation of the supply flow rate control valve 70.
After performing the process of step S107, the control device 140 proceeds to step S108.

In step S108, the control device 140 determines whether or not the amount of heat required in the bathroom 2 has changed.
When it is determined that the amount of heat required in the bathroom 2 has changed, the control device 140 proceeds to step S101.
When the controller 140 determines that the amount of heat required in the bathroom 2 has not changed, the controller 140 proceeds to step S109.

In step S109, the control device 140 determines whether or not the amount of heat required in the desiccant air conditioner 3 has changed.
When determining that the amount of heat required in the desiccant air conditioner 3 has changed, the control device 140 proceeds to step S101.
When it is determined that the amount of heat required in the desiccant air conditioner 3 has not changed, the control device 140 proceeds to step S107.

  In this way, the control device 140 adjusts the bypass ratio and the total flow rate based on the presence or absence of heat (hot water) in the bathroom 2 and the desiccant air conditioner 3 (step S101 and step S102), the bathroom temperature, the desiccant temperature, and the like. A method is determined (step S103, step S104, and step S106). Then, the control device 140 can bring the bathroom temperature and the desiccant temperature closer to the target temperature by adjusting the bypass ratio and the total flow rate according to the determined adjustment method (step S107).

  Further, when the amount of heat required in the bathroom 2 and the desiccant air conditioner 3 has changed (Step S108 and Step S109), the control device 140 again determines the adjustment method of the bypass ratio and the total flow rate (Step S103, Step S109). S104 and step S106). Thereby, even when the amount of heat (that is, the target temperature) required in the bathroom 2 and the desiccant air conditioner 3 changes, the bathroom temperature and the desiccant temperature can be brought close to the target temperature.

As described above, the hot water supply system 1 according to the present embodiment is
A gas burner 52 (first heat source) which is a heat source;
A primary heat exchanger 54 for supplying heat from the gas burner 52 to an antifreeze liquid (heat medium) circulating in the interior;
A first conduit 55 for circulating antifreeze supplied from the primary heat exchanger 54;
A first heat exchanger provided in the middle of the first pipe 55 and capable of exchanging heat between the antifreeze flowing through the first pipe 55 and the water (heat medium) supplied to the bathroom 2 (first hot water supply demand). A hot water supply heat exchanger 60;
A secondary heat exchanger 56 that supplies heat from the gas burner 52 that is not supplied to the antifreeze liquid in the primary heat exchanger 54 to the antifreeze liquid that is supplied from the first pipe 55 and circulates in the interior;
A second conduit 57 for circulating the antifreeze supplied from the secondary heat exchanger 56;
Heat exchange is possible between the antifreeze flowing through the second pipeline 57 and the water (heat medium) supplied to the desiccant air conditioner 3 (second hot water supply demand) provided in the middle of the second pipeline 57. A second hot water supply heat exchanger 61;
It comprises.
By configuring in this way, the antifreeze liquid that has been deprived of heat in the first hot water supply heat exchanger 60 is reheated using heat that has not been supplied to the antifreeze liquid in the primary heat exchanger 54, thereby achieving high efficiency. be able to.

The hot water supply system 1
A hot water storage tank 40 (heat storage tank) for storing the antifreeze supplied to the primary heat exchanger 54;
Tertiary heat exchange for supplying the antifreeze supplied from the second pipe 57 to the antifreeze flowing through the inside, out of the heat from the gas burner 52, the heat not supplied to the antifreeze in the primary heat exchanger 54 and the secondary heat exchanger 56 Instrument 58;
A return line 59 for supplying the antifreeze supplied from the tertiary heat exchanger 58 to the hot water storage tank 40;
Is further provided.
By configuring in this way, the antifreeze liquid that has been deprived of heat in the second hot water supply heat exchanger 61 is reheated using heat that has not been supplied to the antifreeze liquid in the primary heat exchanger 54 and the secondary heat exchanger 56, By returning to the hot water storage tank 40, the temperature of the antifreeze liquid in the hot water storage tank 40 can be raised, and as a result, high efficiency can be achieved.

The hot water supply system 1
At least a part of the antifreeze supplied from the primary heat exchanger 54 can be circulated to the second hot water supply heat exchanger 61 without passing through the first hot water supply heat exchanger 60 and the secondary heat exchanger 56. A bypass line 62 is further provided.
By comprising in this way, supplying a lot of heat to the desiccant air conditioner 3 by supplying the antifreezing liquid before the heat is taken away in the first hot water supply heat exchanger 60 to the second hot water supply heat exchanger 61. Is possible.
Thereby, the amount of heat supplied to the bathroom 2 and the desiccant air conditioner 3 can be easily adjusted.

The hot water supply system 1
A bypass flow rate control valve 62a for adjusting the flow rate of the antifreeze flowing through the bypass line 62;
A first hot water temperature sensor 120 (first temperature detecting means) for detecting the temperature of the water supplied from the first hot water heat exchanger 60 to the bathroom 2;
A second hot water supply temperature sensor 130 (second temperature detection means) for detecting the temperature of the water supplied from the second hot water supply heat exchanger 61 to the desiccant air conditioner 3;
A control device 140 for controlling the operation of the bypass flow rate control valve 62a based on the temperatures detected by the first hot water temperature sensor 120 and the second hot water temperature sensor 130;
Is further provided.
By comprising in this way, according to the temperature of the water supplied to the bathroom 2 and the desiccant air conditioner 3, the calorie | heat amount supplied to the said bathroom 2 and the desiccant air conditioner 3 can be adjusted, respectively.

The hot water supply system 1
A supply flow rate control valve 70 for adjusting the flow rate of the antifreeze supplied to the primary heat exchanger 54;
A first hot water supply temperature sensor 120 for detecting the temperature of water supplied from the first hot water supply heat exchanger 60 to the bathroom 2;
A second hot water supply temperature sensor 130 for detecting the temperature of water supplied from the second hot water supply heat exchanger 61 to the desiccant air conditioner 3;
A control device 140 for controlling the operation of the supply flow rate control valve 70 based on the temperatures detected by the first hot water temperature sensor 120 and the second hot water temperature sensor 130;
Is further provided.
By comprising in this way, according to the temperature of the water supplied to the bathroom 2 and the desiccant air conditioner 3, the total amount of the heat supplied to the said bathroom 2 and the desiccant air conditioner 3 can be adjusted.

The hot water supply system 1
A bypass flow rate control valve 62a for adjusting the flow rate of the antifreeze flowing through the bypass line 62;
A supply flow rate control valve 70 for adjusting the flow rate of the antifreeze supplied to the primary heat exchanger 54;
A first hot water supply temperature sensor 120 for detecting the temperature of water supplied from the first hot water supply heat exchanger 60 to the bathroom 2;
A second hot water supply temperature sensor 130 for detecting the temperature of water supplied from the second hot water supply heat exchanger 61 to the desiccant air conditioner 3;
A control device 140 for controlling the operations of the bypass flow rate control valve 62a and the supply flow rate control valve 70 based on the temperatures detected by the first hot water temperature sensor 120 and the second hot water temperature sensor 130;
Is further provided.
By comprising in this way, according to the temperature of the water supplied to the bathroom 2 and the desiccant air conditioner 3, the amount of heat supplied to the said bathroom 2 and the desiccant air conditioner 3, respectively, and the total amount of the said heat amount are adjusted. can do.

In addition, the first hot water supply demand or the second hot water supply demand according to the present invention is:
At least the desiccant air conditioner 3 is included.
With such a configuration, high efficiency can be achieved in the hot water supply system 1 that supplies heat to the desiccant air conditioner 3.

  In this embodiment, water (hot water) and antifreeze liquid are used as the heat medium. However, the heat medium according to the present invention is not limited to this, and can be arbitrarily selected and used. .

  In the drawing, the primary heat exchanger 54, the secondary heat exchanger 56, and the tertiary heat exchanger 58 are shown in a simplified manner. However, in practice, the pipe is formed by meandering several times. Also good.

  Moreover, in this embodiment, although the gas burner 52 was illustrated as one Embodiment of a 1st heat source, this invention is not limited to this. That is, other heat sources can be used as long as sufficient heat can be generated.

  Moreover, in this embodiment, although the bathroom 2 and the desiccant air conditioner 3 were illustrated as one Embodiment of a 1st hot-water supply demand and a 2nd hot-water supply demand, this invention is not limited to this. That is, as long as the facility uses heat, various other facilities (for example, a floor heating facility) can be used.

  In the present embodiment, the first hot water supply demand and the second hot water supply demand (that is, the bathroom 2 and the desiccant air conditioner 3) have been described as different facilities, but the present invention is not limited to this. That is, the same equipment (for example, both are bathroom 2) may be sufficient as the 1st hot-water supply demand and the 2nd hot-water supply demand.

  In the present embodiment, the hot water supply system 1 includes a hot water storage tank 40 that stores a heat medium (antifreeze) that is heated by heat from the second heat source (solar hot water system 10, heat pump water heater 20, and fuel cell system 30). However, the present invention is not limited to this. For example, as in the hot water supply system 1 shown in FIG. 7, it is possible to have a configuration including a plurality of hot water storage tanks (first hot water storage tank 41, second hot water storage tank 42, and third hot water storage tank 43). Hereinafter, the hot water supply system 1 according to the modification shown in FIG. 7 will be briefly described.

  The hot water supply system 1 according to the modification shown in FIG. 7 is different from the hot water supply system 1 according to the above-described embodiment (see FIG. 1 etc.) in that instead of the hot water storage tank 40, a first hot water storage tank 41 and a second hot water storage tank 42. And a third hot water storage tank 43.

  The first hot water storage tank 41 is connected to the heat collection panel 11 and stores the warmed antifreeze supplied from the heat collection panel 11. The second hot water storage tank 42 is connected to the heat pump unit 21 and stores a warmed antifreeze liquid supplied from the heat pump unit 21. The third hot water storage tank 43 is connected to the power generation unit 31 and stores the warmed antifreeze supplied from the power generation unit 31.

  A first supply pipe 41a connected to the first hot water storage tank 41, a second supply pipe 42a connected to the second hot water storage tank 42, and a third supply pipe 43a connected to the third hot water storage tank 43 are supplied. It is connected to the supply pipeline 53 via the pipeline switching valve 53a. The supply line switching valve 53a switches one of the internal flow paths, thereby switching any one of the first supply line 41a, the second supply line 42a, or the third supply line 43a, and the supply line 53. You can communicate.

  In addition, a first return pipe 41 b connected to the first hot water storage tank 41, a second return pipe 42 b connected to the second hot water storage tank 42, and a third return pipe 43 b connected to the third hot water storage tank 43 are The return line 59 is connected to the return line 59 via the return line switching valve 59a. The return line switching valve 59a switches one of the internal flow paths so that any one of the first return line 41b, the second return line 42b, or the third return line 43b and the return line 59 are connected. You can communicate.

  In the hot water supply system 1 according to the modified example configured as described above, any one of the first hot water storage tank 41, the second hot water storage tank 42, or the third hot water storage tank 43 can be switched by arbitrarily switching the supply pipe switching valve 53a. The antifreeze liquid in the hot water storage tank can be supplied to the supply line 53. For example, among the first hot water storage tank 41, the second hot water storage tank 42, or the third hot water storage tank 43, by supplying the antifreeze liquid from the hot water storage tank having the highest temperature of the stored antifreeze liquid, heat is efficiently supplied to the hot water supply demand. can do.

  Further, by arbitrarily switching the return pipe switching valve 59 a, the antifreeze liquid supplied from the return pipe 59 can be transferred to any one of the first hot water storage tank 41, the second hot water storage tank 42, and the third hot water storage tank 43. And return. For example, among the first hot water storage tank 41, the second hot water storage tank 42, or the third hot water storage tank 43, the antifreezing liquid (that is, tertiary heat exchange) supplied to the hot water storage tank having the lowest temperature of the stored antifreezing liquid. By returning the antifreeze liquid warmed by the vessel 58, the temperature of the antifreeze liquid in the hot water storage tank can be increased.

As described above, the hot water supply system 1 according to the modified example is as follows.
A plurality of second heat sources (solar hot water system 10, solar heat supply system 10) that supply heat to the heat medium stored in the hot water storage tanks (first hot water storage tank 41, second hot water storage tank 42, and third hot water storage tank 43). A heat pump water heater 20 and a fuel cell system 30),
The hot water storage tank is
A plurality of second heat sources are provided corresponding to each of the plurality of second heat sources.
By comprising in this way, the antifreeze liquid stored in the some hot water storage tank provided corresponding to the some 2nd heat source can be utilized.

  In addition, in this embodiment and the modification, although the solar hot water system 10, the heat pump water heater 20, and the fuel cell system 30 were illustrated as one Embodiment of a 2nd heat source, this invention is not limited to this. That is, the second heat source only needs to be capable of generating heat.

1 Hot water supply system 2 Bathroom (1st hot water supply demand)
3 Desiccant air conditioner (second hot water supply demand)
10 Solar water heating system (second heat source)
20 Heat pump water heater (second heat source)
30 Fuel cell system (second heat source)
40 Hot water storage tank (heat storage tank)
52 Gas burner (first heat source)
54 Primary Heat Exchanger 55 First Pipeline 56 Secondary Heat Exchanger 57 Second Pipeline 58 Tertiary Heat Exchanger 59 Return Pipeline 60 First Hot Water Heat Exchanger 61 Second Hot Water Supply Heat Exchanger 62 Bypass Line 62a Bypass Flow control valve 70 Supply flow control valve 120 First hot water supply temperature sensor (first temperature detection means)
130 Second hot water temperature sensor (second temperature detection means)
140 Controller

Claims (8)

A first heat source that is a source of heat;
A primary heat exchanger for supplying heat from the first heat source to a heat medium circulating in the interior;
A first conduit for circulating a heat medium supplied from the primary heat exchanger;
A first hot water supply heat exchanger that is provided in the middle of the first pipe and is capable of exchanging heat between the heat medium flowing through the first pipe and the heat medium supplied to the first hot water supply demand;
A secondary heat exchanger that supplies heat that has been supplied from the first pipe line and circulates in the interior, out of the heat from the first heat source, to the heat medium in the primary heat exchanger; ,
A second conduit for circulating the heat medium supplied from the secondary heat exchanger;
A second hot water supply heat exchanger that is provided in the middle of the second pipe and is capable of exchanging heat between the heat medium flowing through the second pipe and the heat medium supplied to the second hot water supply demand;
A hot water supply system. A heat storage tank for storing a heat medium supplied to the primary heat exchanger;
Supply heat from the first heat source that has not been supplied to the heat medium in the primary heat exchanger and the secondary heat exchanger, to the heat medium that is supplied from the second pipe and flows inside. A tertiary heat exchanger,
A return pipe for supplying a heat medium supplied from the tertiary heat exchanger to the heat storage tank;
Further comprising
The hot water supply system according to claim 1. A heat supply source, further comprising a plurality of second heat sources for supplying heat to the heat medium stored in the heat storage tank;
The heat storage tank is
A plurality are provided corresponding to each of the plurality of second heat sources,
The hot water supply system according to claim 2. At least a part of the heat medium supplied from the primary heat exchanger can be circulated to the second hot water supply heat exchanger without passing through the first hot water supply heat exchanger and the secondary heat exchanger. A further bypass line,
The hot water supply system according to any one of claims 1 to 3. A bypass flow rate control valve for adjusting the flow rate of the heat medium flowing through the bypass line;
First temperature detecting means for detecting the temperature of the heat medium supplied from the first hot water supply heat exchanger to the first hot water supply demand;
Second temperature detection means for detecting the temperature of the heat medium supplied from the second hot water supply heat exchanger to the second hot water supply demand;
A control device for controlling the operation of the bypass flow rate control valve based on the temperature detected by the first temperature detection means and the second temperature detection means;
Further comprising
The hot water supply system according to claim 4. A supply flow rate control valve for adjusting the flow rate of the heat medium supplied to the primary heat exchanger;
First temperature detecting means for detecting the temperature of the heat medium supplied from the first hot water supply heat exchanger to the first hot water supply demand;
Second temperature detection means for detecting the temperature of the heat medium supplied from the second hot water supply heat exchanger to the second hot water supply demand;
A control device for controlling the operation of the supply flow rate control valve based on the temperature detected by the first temperature detection means and the second temperature detection means;
Further comprising
The hot water supply system according to any one of claims 1 to 4. A bypass flow rate control valve for adjusting the flow rate of the heat medium flowing through the bypass line;
A supply flow rate control valve for adjusting the flow rate of the heat medium supplied to the primary heat exchanger;
First temperature detecting means for detecting the temperature of the heat medium supplied from the first hot water supply heat exchanger to the first hot water supply demand;
Second temperature detection means for detecting the temperature of the heat medium supplied from the second hot water supply heat exchanger to the second hot water supply demand;
A control device for controlling operations of the bypass flow rate control valve and the supply flow rate control valve based on temperatures detected by the first temperature detection unit and the second temperature detection unit;
Further comprising
The hot water supply system according to claim 4. The first hot water demand or the second hot water demand is
Including at least a desiccant air conditioner,
The hot water supply system according to any one of claims 1 to 7.

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