JP2010249366A - Storage water heater system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage type water heater system for suppressing increase of energy consumption without running out of hot water when the heat insulation performance is deteriorated. <P>SOLUTION: The system includes a hot water storage tank 1, heat insulating material 5 covering the hot water storage tank 1, a heating means 2 for adding a heat to hot water in the hot water storage tank 1, a heat storage quantity calculation means 101 for calculating a heat storage quantity in the hot water in the hot water storage tank 1, a heat insulation performance detection means 102 for detecting the heat insulation performance of the heat insulating material 5 based on the heat storage quantity, and a control means 103 which determines whether the heat insulation performance is deteriorated or not based on the heat insulation performance detected by the heat insulation performance detection means 102, determines the heat to be added to the hot water during a specific time zone according to the determined deterioration of the heat insulation performance, and carries out heating control of the heating means 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water supply system including a hot water storage tank for storing hot water for hot water supply boiled by a heating means. In particular, the present invention relates to a system characterized in that the control of the heating means is changed in accordance with the deterioration of the heat insulating performance by the heat insulating material that keeps the hot water storage tank warm.

  The hot water storage type hot water supply system is a system that is applied when the heating capability of the heating means is relatively small compared to the instantaneous type or the like, or when the rising of the capability at the time of starting the heating unit is slower than the instantaneous type. Hot water for hot water (hot water or water) boiled in advance by the heating means is stored in a hot water storage tank and hot water is supplied from the hot water storage tank so that hot water does not run out due to the occurrence of hot water supply load. I am doing so.

  In such a system, since hot water is boiled before hot water is supplied on the demand side, it is necessary to keep the hot water in the hot water storage tank warm. Therefore, it is common to keep the hot water storage tank covered with a heat insulating material. However, when the heat insulating performance of the heat insulating material is lowered due to deterioration over time or the like, the amount of heat released from the hot water storage tank to the outside world increases.

  In response to this, for example, a method is known in which deterioration of heat insulation performance is detected and an alarm is issued (see, for example, Patent Document 1).

  In addition, for example, in order to avoid a shortage of hot water on the demand side due to insufficient heat storage due to heat radiation from the hot water storage tank to the outside world, there is a method of detecting the deterioration of the heat insulation performance and increasing the temperature in the hot water storage tank. Are known.

JP 2007-132599 A JP 2007-155154 A

  However, according to the above-mentioned Patent Document 1, since the operation on the heating means side is not changed until the maintenance is performed after the deterioration of the heat insulation performance is detected, there is a risk that the hot water runs out on the demand side. was there.

  Further, according to Patent Document 2, although the risk of running out of hot water is reduced, the amount of heat released from the hot water storage tank to the outside greatly increases, and the heating means needs to boil hot water by that much. Therefore, there has been a problem that the efficiency of the system is extremely lowered.

  The present invention was made to solve the above-described problems, and an object of the present invention is to provide a hot water storage system that suppresses an increase in energy consumption without causing hot water shortage when the heat insulation performance deteriorates. It is to provide a hot water supply system.

  In order to solve the above problems, a hot water storage hot water system according to the present invention includes a hot water storage tank, a heat insulating material covering the hot water storage tank, a heating means for adding heat to the hot water in the hot water storage tank, and a heat storage amount in the hot water in the hot water storage tank. Whether the heat insulation performance has deteriorated based on the heat insulation performance detection means for detecting the heat insulation performance of the heat insulating material based on the heat storage amount, and the heat insulation performance detected by the heat insulation performance detection means. Control means for determining the amount of heat to be added to the hot water in a specific time zone according to the deterioration of the heat insulation performance due to the determination, and performing heating control of the heating means.

  According to the present invention, when the heat insulation performance detection means detects the heat insulation performance based on the heat storage amount calculated by the heat storage amount calculation means, and when the control means determines that the heat insulation performance is deteriorated based on the detection result, Since the amount of heat to be added to the hot water in a specific time zone is determined, for example, the amount of stored heat that is boiled for a long time before the occurrence of a hot water supply load such as in the midnight time zone is reduced, and it is closer to the occurrence of a hot water supply load. It is possible to increase the amount of heat that is boiled in the time zone, and to reduce the amount of heat released from the hot water storage tank to the outside world. For this reason, even if the heat insulation performance of the heat insulating material deteriorates, hot water does not run out, an increase in necessary energy consumption can be suppressed, and energy saving performance can be improved.

The block diagram of the hot water storage type hot-water supply system in connection with this invention. The block diagram showing the flow of the signal in this invention. The time chart which showed an example of the hot water supply load. Time chart of hot water storage tank calorific value with normal insulation performance. Heat storage tank calorie time chart under abnormal insulation conditions. Accumulated heat dissipation time chart from hot water storage tank to the outside world. FIG. 6 is a schematic diagram of a remote control 400 in Embodiment 2 of the present invention. The schematic diagram of the control action by the operation mode selection in Embodiment 2 of this invention. The schematic diagram of the integrated heat radiation amount by the operation mode selection in Embodiment 2 of this invention.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a configuration relating to hot water supply of a hot water storage type hot water supply system according to Embodiment 1 of the present invention. In the hot water storage type hot water supply system according to the present invention, the hot water storage tank 1 is a tank for storing hot water, and is covered with a heat insulating material 5 in order to keep the heated hot water effectively for a long time. The heating pipe 301 is a pipe that connects the lower part and the upper part of the hot water storage tank 1. The heating means 2 heats hot water flowing through the heating pipe 301 in the middle of the heating pipe 301 (adds heat). Circulation pump 3 forms a flow of hot water (hereinafter also referred to as hot water or water) that flows through heating pipe 301.

  On the other hand, the water supply pipe 302 is connected to the lower part of the hot water storage tank 1 and is a pipe for supplying water from the outside. The lead-out pipe 303 is connected to the upper part of the hot water storage tank 1 and is a pipe for leading hot water from the hot water storage tank 1. The mixing pipe 304 is a pipe that branches water from the water supply pipe 302. Furthermore, the hot water supply pipe 305 is a pipe for supplying hot water to the load side to be used. Then, the derivation pipe 303, the mixing pipe 304, and the hot water supply pipe 305 are connected to the mixing means 4, and hot water in which hot water flowing through the derivation pipe 303 and water flowing through the mixing pipe 304 are mixed is used for hot water supply. It is made to flow through the pipe 305.

  Further, the hot water storage tank 1 has a temperature (hot water temperature) at each position at a certain interval, for example, in a height direction (vertical direction, in this case, in particular, the height from the upper part to the lower part of the hot water tank 1). A plurality of hot water storage temperature sensors 501a to 501f are provided. Here, the number of hot water storage temperature sensors is simply six, but the number is not limited to this number. Basically, a sufficient number of temperature sensors are provided to measure the temperature distribution inside the hot water storage tank 1. On the other hand, the heating pipe 301 is provided with a boiling temperature sensor 502 for detecting the hot water temperature after heating on the downstream side of the heating means 2. Furthermore, a derivation temperature sensor 503 for detecting the hot water temperature derived from the hot water storage tank 1 is provided in the derivation pipe 303, and the water supply pipe 302 (or the mixing pipe 304) is provided for detecting the water supply temperature. A water supply temperature sensor 504 is provided. The hot water supply pipe 305 is provided with a hot water supply temperature sensor 505 for detecting the temperature of hot water supplied to the load side. The hot water supply pipe 305 is provided with a hot water supply flow rate sensor 601 for detecting the amount of hot water used on the load side.

  FIG. 2 is a block diagram showing a signal flow related to the control of the hot water storage type hot water supply system. In FIG. 2, a timer 701 is time detection means. The signal including the data detected by the timer 701, the hot water storage temperature sensors 501a to 501f, the boiling temperature sensor 502, the derived temperature sensor 503, the feed water temperature sensor 504, the hot water temperature sensor 505, and the hot water flow rate sensor 601 is the control device 100. Sent to. The control device 100 performs calculations, determinations, and the like based on these data, and controls the heating unit 2, the circulation pump 3, and the mixing unit 4.

  The control device 100 includes a heat storage amount calculation unit 101, a heat insulation performance detection unit 102, a control unit 103, and a storage unit 104. The heat storage amount calculation means 101 calculates the heat storage amount in the hot water storage tank 1. Further, the heat insulation performance detecting means 102 detects the heat insulation performance of the heat insulating material covering the hot water storage tank 1. The control means 103 performs a process for controlling the heating means 2, the circulation pump 3 and the mixing means 4. Details of processing performed by each means will be described later. In addition, the control device 100 includes a storage unit 104 that temporarily or long-term stores data necessary for each unit in the device to perform processing. Here, the control device 100 is configured as a device having each means. However, for example, the control device 100 may be configured separately for different dedicated devices (hardware).

  Next, the basic operation of the hot water storage type hot water supply system according to the present invention will be described based on the flow of hot water. First, low temperature water flows from the lower part of the hot water storage tank 1 through the water supply pipe 302 and is stored. The low-temperature water in the lower part of the hot water storage tank 1 is drawn into the heating pipe 301 by the circulation pump 3 and guided to the heating means 2, and the heating means 2 adds heat to boil the hot water. The boiled hot water flows from the upper part of the hot water storage tank 1 through the heating pipe 301 and is stored.

  The hot water stored in the upper part of the hot water storage tank 1 flows out from the outlet pipe 303 and is guided to the mixing means 4 according to the demand on the load side where hot water is used. The water branched from the water supply pipe 302 and passed through the mixing pipe 304 and the hot water guided from the hot water storage tank 1 are mixed in the mixing means 4 and supplied to the load side through the hot water supply pipe 305.

  Thereby, low-temperature water is boiled by the heating means 2 and hot water is stored in the hot water storage tank 1, and hot water stored in the hot water storage tank 1 can be sent to the load side.

  FIG. 3 is a diagram illustrating an example of a time chart in the case where the daily hot water supply load (supplied heat amount) is integrated. Here, the unit of heat quantity is expressed as [L] in terms of the amount of hot water at an average hot water supply temperature (for example, 42 ° C.). For example, in FIG. 3, it can be seen that there is no demand for hot water supply from 00:00 to 07:00, while the demand increases from 21:00 to 22:00. Next, the heating control of the heating means 2 for storing hot water required for a predetermined period (for example, one day) in the hot water storage tank 1 performed by the control device 100 according to the present invention will be described.

  First, the heat storage amount calculation means 101 calculates the hot water storage tank heat storage amount Q, for example, as shown in the following equation (1) with reference to the water supply temperature Ts. Here, the temperature values related to the detection of the hot water storage temperature sensors 501a to 501f are Twa to Twf, respectively. Moreover, based on the installation position of each of the hot water storage temperature sensors 501a to 501f, for example, the internal volume of the hot water storage tank 1 from the upper end of the hot water storage tank 1 to the height of each hot water storage temperature sensor is set to Va to Vf, respectively. It is assumed that data relating to the internal volumes Va to Vf is stored in the storage unit 104 in advance.

Q = Va × (Twa−Ts) × density × specific heat
+ (Vb−Va) × {(Twa + Twb) / 2−Ts} × density × specific heat +... + (Vf−Ve) × {(Twe + Twf) / 2−Ts} × density × specific heat + (tank capacity−Vf) × (Twf−Ts} × density × specific heat (1)

  Here, with respect to the height direction of the hot water storage tank 1, it is known that the calculation accuracy decreases when the calculation of the equation (1) is performed including the temperature boundary layer in which the hot water temperature (water temperature) changes rapidly. . For this reason, it is basically desirable to calculate the hot water storage tank heat storage amount Q for a portion not including the temperature boundary layer. For example, the hot water storage tank heat storage is performed by using the uppermost hot water storage temperature sensor (for example, 501a) and the lowest hot water storage temperature sensor (for example, 501e) indicating the detection value within a predetermined temperature as a portion not including the temperature boundary layer. The quantity Q may be calculated as in the following equation (2). Here, the hot water storage temperature sensor at the lowest position not including the temperature boundary layer is set to 501e. However, it may be set as a hot water storage temperature sensor at an upper position for safety with respect to the temperature boundary layer.

Q = Va × (Twa−Ts) × density × specific heat + (Vb−Va) × {(Twa + Twb) / 2−Ts} × density × specific heat +... + (Ve−Vd) × {(Twd + Twe) / 2−Ts } X density x specific heat (2)

  Here, with respect to the water supply temperature Ts, if the change in the temperature every time according to the detection of the water supply temperature sensor 504 is reflected, even if the amount of heat stored in the tank does not actually change, the water supply temperature Ts changes, so The calculation result of the quantity Q changes. For this reason, for example, the water supply temperature Ts used for the calculation of the heat storage amount Q of the hot water storage tank may not be changed, for example, during a period in which the heat insulation performance detecting means 102 is detecting the heat insulation performance. Further, the temperature reference for calculating the hot water storage tank heat storage amount Q may be simply a fixed temperature value (for example, 0 ° C.) instead of the water supply temperature Ts.

  Further, the selection of the hot water storage temperature sensor used for calculating the hot water storage tank heat storage amount Q is not changed during the period when the heat insulation performance detecting means 102 is detecting the heat insulation performance, for example.

The adiabatic performance detecting means 102 detects the adiabatic performance by calculating the adiabatic performance R based on the following equation (3) when there is no hot water supply to the demand side, no boiling by the heating means 2, and the like. Here, the detection start time obtained based on the signal from the timer 701 is defined as t1. Moreover, let the temperature value which concerns on the detection of the hot water storage temperature sensors 501a-501f in the start time t1 be Twa1-Twf1, respectively. The hot water storage tank heat storage amount calculated by the heat storage amount calculation means 101 based on Twa1 to Twf1 is defined as Q1. And let the average value of the temperature value used in order to calculate the hot water storage tank heat storage amount Q1 be Tw1, and let the temperature value which the outside temperature detection means (not shown) detected be Ta1. Further, the temperature values related to the detection of the hot water storage temperature sensors 501a to 501f when the end time related to the detection obtained based on the signal from the timer 701 is t2 are Twa2 to Twf2, respectively. Let Q2 be the hot water storage tank heat storage amount calculated by the heat storage amount calculation means 101 based on Twa2 to Twf2. And let the average value of the temperature value used in order to calculate the hot water storage tank heat storage amount Q2 be Tw2, and let the temperature value which the outdoor temperature detection means detected be Ta2. Furthermore, for example, the surface area of the hot water storage tank 1 from the upper end of the hot water storage tank 1 to the height of each of the hot water storage temperature sensors 501a to 501f is Aa to Af, respectively, and the hot water storage temperature sensor 501 used to calculate the hot water storage tank heat storage amounts Q1 and Q2. Is selected from Aa to Af. For example, when hot water storage temperature sensors 501a to 501e are used, A = Ae. Data relating to the surface areas Aa to Af is stored in the storage unit 104 in advance.
(1 / R) = {(Q1-Q2) / (t2-t1)} /
A. [{(Tw1-Ta1) + (Tw2-Ta2)} / 2] (3)

  Based on the equation (3), the heat insulation performance R is obtained by dividing the amount of heat released in the hot water tank 1 per unit time by the product of the average value of the temperature difference between the temperature of the hot water tank 1 and the outside air temperature and the surface area of the hot water tank 1. The reciprocal of the value obtained. For this reason, the heat insulation performance R generally represents the thermal resistance per unit area between the hot water in the hot water storage tank 1 and the outside air.

  Moreover, the heat insulation performance detection means 102 can also calculate the heat insulation performance R even in a time zone including hot water supply to the demand side and boiling by the heating means 2. In this case, in addition to the above values, the integrated value Qhp of the heating capacity of the heating means 2 and the integrated value Qld of the hot water supply load are used.

  The integrated value Qhp of the heating capacity is calculated based on the following equation (4). Here, Whp is a flow rate (for example, volumetric flow rate) of water flowing through the heating pipe 301 according to detection by a heating unit circulation flow rate detection unit (not shown). The inflow temperature Thpi is the temperature of water flowing into the heating means 2 related to detection by the heating means inlet water temperature detection means (not shown). The outflow temperature Thpo is a temperature related to detection by the boiling temperature sensor 502.

  Further, the integrated value Qld of the hot water supply load is calculated based on the following equation (5). Here, Wld is a flow rate related to detection by the hot water supply flow rate sensor 601. The water supply temperature Tldi is a temperature related to detection by the water supply temperature sensor 504, and the hot water supply temperature Tldo is a temperature related to detection by the hot water supply temperature sensor 505.

When hot water supply to the demand side or boiling by the heating means 2 is included, the heat dissipation amount in the hot water supply tank 1 per unit time is calculated based on the sum of the hot water storage tank heat storage amount Q1 and the integrated value Qhp of the heating capacity. It is obtained by subtracting the integrated value Qld of Q2 and the hot water supply load. Therefore, the heat insulation performance R is represented by the following formula (6).
(1 / R) = {(Q1-Q2 + Qhp-Qld) / (t2-t1)} /
A. [{(Tw1-Ta1) + (Tw2-Ta2)} / 2] (6)

Based on the heat insulation performance R detected by the calculation of the heat insulation performance detection means 102, the control means 103 determines whether or not the heat insulation performance is deteriorated depending on the relationship with a reference value determined at the design stage, for example. For example, when the heat insulating material is a vacuum heat insulating material, it shows a value of about 0.002 W / mK at normal time when the heat insulating performance is not deteriorated. It deteriorates to a value of about 0.03 W / mK. Therefore, for example, when the heat insulating material is constituted by a vacuum heat insulating material having a thickness of 8 mm, the theoretical value of the heat insulating performance R in a normal state is 0.008 / 0.002 = 4 [m ² K / W]. On the other hand, the theoretical value of the heat insulation performance R when the vacuum state is impaired is 0.008 / 0.03 = 0.267 [m ² K / W]. In this case, for example, a value between 4 and 0.267 is used as a reference value, and deterioration of the heat insulation performance can be determined based on the magnitude relationship with the heat insulation performance R. The reference value data is determined in advance by the system configuration according to, for example, a heat insulating material that covers the hot water tank 1, the size of the hot water tank 1, and the like, and is stored in the storage unit 104.

  The control means 103 controls the heating means 2 based on the determination result of the deterioration of the heat insulation performance. Here, the heating means 2 may be controlled on the assumption that it has not deteriorated until the first determination is made, or the heating means 2 may be controlled as being deteriorated.

  FIG. 4 is a diagram for illustrating boiling control in a normal case where the heat insulating performance by the heat insulating material is not deteriorated. The control means 103 performs heating control by heating the water to the heating means 2 and adding a predetermined amount of heat (collective boiling heat amount) in the late-night time zone, and boiling it collectively. In the case of batch boiling control, the cost advantage of boiling and storing hot water in the midnight hours when the charge is low, and the reduction in equipment life and the increase in low-efficiency operation due to the increase in the number of starts and stops of the heating means 2 are avoided. There is merit to do.

  Here, a predetermined value may be adopted as the collective boiling heat amount, or it may be determined on the basis of the integrated hot water supply load estimated to be necessary for one day. Here, the integrated hot water supply load estimated to be necessary for one day may adopt a predetermined value, or may be predicted from the past hot water supply load results. In FIG. 4, the accumulated hot water supply load required on the day is predicted to be 400L, and the total boiling heat amount is added to about 500L in the midnight hours so that the heat storage amount of the hot water storage tank 1 at the end of the day is 100L. Shows the case of boiling.

  Further, for example, the lower limit value of the heat storage amount in the hot water storage tank 1 in the time zone other than the above-mentioned batch boiling is set as the start heat storage amount, and the upper limit value is set as the stop heat storage amount and stored in the storage unit 104. May be. When the control unit 103 determines that the hot water storage tank heat storage amount Q is equal to or less than the startup heat storage amount (for example, 50 L) in the time zone other than the time of batch boiling, the control unit 103 starts the heating unit 2 and the circulation pump 3. If the water is heated and it is determined that the amount of stored heat is not less than 100 L (for example, 100 L), the heating means 2 and the circulation pump 3 may be controlled to stop. Thereby, the hot water storage amount in a predetermined range is stored in the hot water storage tank 1, and the heat storage amount maintenance control that does not cause hot water shortage with respect to demand can be performed. Collective boiling corresponds to the case where the hot water supply demand is insufficient.

  FIG. 5 is a diagram for illustrating boiling control when it is determined that the heat insulation performance has deteriorated. In FIG. 5, it shows with the boiling-up control operation | movement by the prior art (technology regarding the patent document 2 which increases the hot water storage tank temperature at the time of abnormality of a heat insulating material). Here, FIG. 5 shows a case where the heat insulation performance has deteriorated to about 1/5 of the normal value.

  In the present invention, when it is determined that the heat insulation performance has deteriorated, the amount of heat for boil-up is reduced as compared with the normal case. Then, the amount of heat is controlled to be boiled by heat storage amount maintenance control. In FIG. 5, the heat storage amount in the midnight time zone is reduced to about 150L. Then, in the time zone from 17:00 to 21:00 before the time zone from 21:00 where demand for hot water supply such as hot water filling and bathing is expected to be high, the water is boiled until the heat storage amount is about 300L. In other time periods, if the control means 103 determines that the starting heat storage amount is 50 L or less, the heating means 2 and the circulation pump 3 are started to heat the water, add heat, and stop heat storage amount. When it is determined that the pressure is 100 L or more, the heating means 2 and the circulation pump 3 are controlled to be stopped.

  FIG. 6 is a graph showing a cumulative heat radiation amount from the hot water storage tank 1 to the outside world according to the first embodiment. In FIG. 6, with respect to the control shown in FIGS. 4 and 5, the control when the heat insulation performance is not deteriorated, the control according to the prior art when the heat insulation performance is deteriorated, and the control according to the present invention are three patterns. Show. From FIG. 6, it can be seen that the integrated heat radiation amount from the hot water storage tank 1 is smaller than the heat radiation amount in the prior art by the calculation, control, and the like performed by the control device 100 according to the present invention.

  Here, an arbitrary fixed value is used with the collective boiling heat amount being 150 L, but it may be determined by calculation or the like according to the degree of deterioration of the heat insulation performance. For example, when it is determined that the heat insulation performance R has deteriorated to α times the reference value, the heat insulation performance R may be determined as a function of α, such as α times the collective boiling heat amount at the reference value.

  Moreover, when the deterioration of the heat insulation performance is determined in the present invention, the control means 103 may be operated so as to increase the heating capability of the heating means 2 and increase the safety against running out of hot water.

  Furthermore, while increasing the heating capability of the heating means 2, you may make it reduce at least one of the starting heat storage amount and the stop heat storage amount mentioned above. Thereby, the heat radiation amount in the hot water storage tank 1 can be reduced without impairing the safety of running out of hot water as much as possible.

  As described above, according to the hot water storage type hot water supply system of the first embodiment, the heat insulation performance is based on the heat storage tank heat storage amount Q calculated by the heat storage amount calculation means 101 and the temperature values related to the detection of the hot water storage temperature sensors 501a to 501f. When the detection means 102 detects the heat insulation performance, and the control means 103 determines that the heat insulation performance is deteriorated based on the detection result, it determines the amount of heat to be added to the hot water in a specific time zone, For example, the amount of heat stored in the boiling time is reduced before the occurrence of a hot water supply load such as at midnight, and the amount of heat heated up in the time zone closer to the occurrence of a hot water load is increased. The amount of heat released to the heat source can be reduced, and the increase in required energy consumption can be suppressed due to the deterioration of the heat insulation performance of the heat insulating material, thereby improving the energy saving performance.

  Moreover, since the capability of the heating means is increased based on the detected heat insulation performance, the risk of running out of hot water is reduced, and the amount of heat released from the hot water storage tank 1 is reduced as compared with the conventional invention to save energy. Can be improved.

  Furthermore, a stop heat storage amount that is an upper limit value and a start heat storage amount that is a lower limit value regarding the heat storage amount of the hot water storage tank 1 other than a specific time period are determined, and the heat storage amount of the hot water storage tank 1 is within that range. Since the control means 103 controls the heating of the heating means 2, it is possible to reduce the possibility of running out of hot water and perform stable hot water supply. And when it determines with the heat insulation performance having deteriorated, since the control means 103 was made to control by lowering at least one value of a stop heat storage amount and a starting heat storage amount, the danger of a hot water runout is equivalent. While maintaining the degree, the amount of heat released from the hot water storage tank 1 can be reduced and the energy saving performance can be improved.

Embodiment 2. FIG.
The second embodiment of the present invention will be described below with reference to FIGS. Here, the description of the same parts as those in Embodiment 1 is omitted.

  FIG. 7 is a diagram showing a remote controller 400 (hereinafter referred to as a remote controller 400) for the user to define a control operation in the second embodiment. The remote controller 400 includes an operation mode selection button 401, and a user can select a predetermined operation mode from two or more operation modes and instruct the control device 100. Here, in the hot water storage type hot water supply system according to the present invention, the operation mode can be set alternatively or step by step to prioritize energy saving or cost saving which are in a trade-off relationship. . For example, in FIG. 7B, it can be selected as 1: energy saving mode,..., N: cost saving mode.

  As described in the first embodiment, when it is determined that the heat insulation performance has deteriorated, the control means 103 reduces the total boiling heat amount, but the user selects the decrease amount via the remote controller 400. Change based on the operation mode. For example, when the control means 103 determines that the heat insulation performance has deteriorated, if the operation mode selected by the user is the mode in which energy saving is prioritized most, the batch boiling heat amount is greatly reduced. On the other hand, if the operation mode selected by the user is a mode in which cost saving is prioritized most, the batch boiling heat quantity is controlled to be the same as in the normal state.

  FIG. 8 is a diagram for illustrating boiling control in each operation mode. As shown in FIG. 8, as the operation mode selected by the user is a mode in which energy saving is prioritized, the heat amount is set so that the total boiling heat amount when it is determined that the heat insulation performance is deteriorated, and the hot water supply demand increases. Increase the amount of heat applied during boiling in time.

  FIG. 9 is a graph showing a cumulative heat release amount from the hot water storage tank 1 to the outside world according to the second embodiment. As shown in FIG. 9, it can be understood that the integrated heat radiation amount from the hot water storage tank 1 decreases as the mode in which energy saving is prioritized.

  In addition, the remote control 400 of FIG. 7 has a heat dissipation level display unit 402 that displays the degree of heat dissipation from the hot water storage tank 1 so as to be a determination material when the user selects an operation mode. Here, the heat radiation level is determined based on the heat radiation amount shown in the equations (3), (6), and the like. The heat dissipation level may be expressed in terms of how much of the boiling heat amount during the unit period is dissipated to the outside world, or estimated from the heat insulation performance and what percentage of the heat dissipation amount in the normal state is the current heat dissipation amount. It may be shown in the form of Moreover, you may show not the heat dissipation level but the level of heat insulation performance, for example in the form of ratio with a reference value.

  Further, the hot water storage type hot water supply system may be provided with a notifying means (not shown) for notifying the deterioration of the heat insulation performance when the detection value of the heat insulation performance detection means 102 falls below a predetermined range. . For example, it is possible to use a warning sound in the vicinity of the heating means 2 or a method of generating a warning sound from the remote control 400. Further, a method for displaying the fact on the display unit 403 of the remote controller 400 may be used. Moreover, it is good also as a system which reports to a service center etc. using a telecommunication line, a radio | wireless, etc.

  As described above, the hot water storage type hot water supply system according to the second embodiment selects, for example, an operation that prioritizes energy saving and an operation that prioritizes cost saving via the remote control 400 having the operation mode selection button 401. Since the user can select the target in stages or in steps, the energy saving performance can be improved in accordance with the user's intention.

  In addition, since the heat radiation level display unit 402 and the display unit 403 are provided to display to the user, the user can select the operation mode based on the current heat radiation level, and more to the user's intention. Energy savings can be improved along the shape.

  Furthermore, since the notification means is provided, it is possible to shorten the time from when the performance deterioration of the heat insulating material is detected until the user or the maintenance company takes measures. Therefore, it can be expected that energy loss due to heat radiation from the hot water storage tank 1 to the outside world can be reduced, so that energy saving can be improved.

  DESCRIPTION OF SYMBOLS 1 Hot water storage tank, 2 Heating means, 3 Circulation pump, 4 Mixing means, 5 Heat insulation material, 100 Control means, 101 Heat storage amount calculation means, 201 Thermal insulation performance detection means, 301 Heating piping, 302 Water supply piping, 303 Outlet piping , 304 Mixing pipe, 305 Hot water supply pipe, 400 Remote control, 401 Operation mode selection button, 402 Heat release level display section, 403 Display section, 501a to 501f Hot water storage temperature sensor, 502 Boiling temperature sensor, 503 Derived temperature sensor, 504 Water supply Temperature sensor, 505 Hot water temperature sensor, 601 Hot water flow rate sensor, 701 timer.

Claims (7)

A hot water storage tank,
A heat insulating material covering the hot water storage tank;
Heating means for applying heat to the hot water in the hot water storage tank;
A heat storage amount calculating means for calculating a heat storage amount in the hot water in the hot water storage tank;
Based on the heat storage amount, heat insulation performance detecting means for detecting the heat insulation performance of the heat insulating material,
Based on the heat insulation performance detected by the heat insulation performance detection means, it is determined whether the heat insulation performance is deteriorated, and the amount of heat applied to the hot water in a specific time zone is determined according to the deterioration of the heat insulation performance by the determination. A hot water storage hot water supply system comprising: control means for determining and controlling heating of the heating means.   The hot water storage type hot water supply system according to claim 1, wherein the capacity of the heating means is increased based on the heat insulation performance detected by the heat insulation performance detection means.   When the control unit determines that the heat storage amount is equal to or less than a predetermined lower limit value in a time zone other than the specific time zone, the control unit causes the heating unit to heat and the heat storage amount is equal to or greater than a predetermined upper limit value. If it judges that it is, control which stops the said heating means is performed, The hot water storage type hot-water supply system of Claim 1 or 2 characterized by the above-mentioned.   The hot water storage hot water supply system according to claim 3, wherein at least one of the lower limit value and the upper limit value is reduced based on the heat insulation performance detected by the heat insulation performance detecting means. It further comprises a possible operation mode designation means for selecting alternatively or stepwise whether to perform an operation with an emphasis on energy saving or an operation with an emphasis on cost saving.
When the control means determines that the operation with an emphasis on energy saving is selected,
5. The heating control of the heating means is performed by determining the amount of heat to be added to the hot water during the specific time period according to the deterioration of the heat insulation performance by the determination. The hot water storage hot water supply system described in 1.   6. The hot water storage hot water supply system according to claim 5, wherein the operation mode designating unit has a display unit for displaying at least the designated operation mode and the amount of heat released from the hot water storage tank. It further comprises a notification means for performing notification,
The said control means makes it alert | report to the said alerting | reporting means, if it judges that the deterioration degree of the said heat insulation performance became below predetermined value based on the said heat insulation performance which the said heat insulation performance detection means detected. Item 7. A hot water storage hot water supply system according to any one of Items 1 to 6.

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