JP2011012940A - Hybrid hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hybrid hot water supply system, capable of attaining reduction in running cost, improvement in energy consumption, and reduction in COemission.SOLUTION: The hybrid hot water supply system 100 typically includes: a hot water storage tank 110; a heat pump water heater 122; a hot water storage determination means 112 which determines whether the hot water storage is a predetermined hot water storage quantity or more; a combustion water heater 130 which supplies hot water to the hot water storage tank when the hot water storage is less than the predetermined hot water storage quantity; a water supply temperature acquisition means 106; an external air temperature acquisition means 150; a heating capability acquisition unit 218 which acquires a heating capability of the heat pump water heater at an acquired external air temperature; an arithmetic unit 220 which computes a hot water supply flow rate of the heat pump water heater based on the acquired water supply temperature and heating capability and a hot water supply temperature; and a correction unit 222 which corrects the predetermined hot water storage quantity by increasing or decreasing it based on the hot water supply flow rate.

Description

  The present invention relates to a hybrid hot water supply system including a combustion hot water heater as an auxiliary heat source for a heat pump hot water heater.

In recent years, from the viewpoints of reducing running costs, effective use of energy (energy saving), and reduction of CO ₂ emissions, which are greenhouse gases, heat pump water heaters have been widely used for both commercial and general household use. The heat pump type water heater uses the property of absorbing ambient heat when the liquid is vaporized and generating heat when the gas is condensed and liquefied. As a result, the heat pump water heater can reduce primary energy consumption by approximately 40% and CO ₂ emissions by approximately 58%, and running costs can be significantly reduced compared to combustion water heaters. It is said that.

  However, the heat pump water heater is not suitable for applications that rapidly generate a large amount of hot water (high temperature water). Therefore, so-called hybrid hot water supply systems in which a heat pump hot water heater is provided with a combustion hot water heater as an auxiliary heat source in order to supplement the hot water discharge capacity of the heat pump hot water heater are also frequently used. Accompanying this, various techniques related to the hybrid hot water supply system have been proposed and disclosed.

  For example, in Patent Document 1, when the heat pump type hot water heater is mainly operated at night, when the amount of hot water stored is lower than the first amount of hot water during the day, only the heat pump type hot water heater is operated, and when the amount is lower than the second amount of hot water stored. No. 1 describes a technique for operating a combustion type water heater together. According to such a configuration, it is said that necessary hot water storage capacity can be obtained with high energy efficiency.

Japanese Patent No. 4139826

  However, in patent document 1, in order to control whether a combustion type water heater performs hot water discharge with respect to a hot water storage tank, the 2nd hot water storage amount which is a specific value is used as a threshold value. Such a threshold value (second hot water storage amount) is generally set in consideration of the severe winter season, which is the most severe condition in order to avoid running out of hot water. Therefore, in times other than the severest winter season, there is a risk of operating both places that can be handled only by the heat pump type water heater without operating the combustion type water heater.

  Moreover, in patent document 1, it was not able to judge the operation | movement of a combustion type water heater reflecting the prediction of the total hot water supply amount. Specifically, if it is predicted that a large amount of hot water will not be required, even if the amount of hot water stored in the hot water storage tank temporarily falls below the second amount of hot water due to hot water in the bathtub, etc., only the heat pump type hot water heater Both of them were in operation where it was possible to cope with it.

Needless to say, operating a combustion water heater together with a heat pump water heater alone can be wasteful in terms of running cost, energy saving, and CO ₂ emission.

The present invention has been made in view of such a problem, and in consideration of the water supply temperature and the outside air temperature that affect the tapping capacity of the heat pump water heater, the predicted total hot water supply amount, and the like, the combustion type hot water supply An object of the present invention is to provide a hybrid hot water supply system that can further reduce running costs, improve energy consumption, and reduce CO ₂ emissions by controlling the operation of the boiler.

  In order to solve the above problems, a representative configuration of the present invention is a hybrid hot water supply system including a combustion type hot water heater as an auxiliary heat source for a heat pump hot water heater, and a hot water storage tank and a heat pump for discharging hot water to the hot water storage tank A hot water storage amount determining means for determining whether the hot water storage amount of the water heater, the hot water storage tank is equal to or greater than the predetermined hot water storage amount, A heat pump characteristic table storing the correspondence relationship between the heating capacity and the outside air temperature of the combustion type water heater for extracting hot water, the feed water temperature obtaining means for obtaining the feed water temperature, the outside air temperature obtaining means for obtaining the outside air temperature, and the heat pump water heater. A heating capacity acquisition unit that acquires the heating capacity corresponding to the acquired outside air temperature with reference to the heat pump characteristic table, and at least the acquired water supply Based on the temperature and heating capacity, and the hot water temperature for the hot water storage tank of the heat pump water heater, a calculation unit for calculating the hot water flow rate at which the heat pump water heater can discharge hot water per unit time, and the calculated hot water flow rate And a correction unit that obtains a difference from a preset reference value of the hot water flow rate and corrects by increasing or decreasing a predetermined hot water storage amount based on the difference.

According to such a configuration, the threshold value (predetermined hot water storage amount) for determining whether or not the combustion type hot water heater can be operated is corrected by taking into consideration the hot water temperature and the outside air temperature that affect the hot water discharge capacity of the heat pump hot water heater. be able to. Thereby, unnecessary operation of the combustion type water heater can be eliminated, and further reduction of running cost, improvement of energy consumption (reduction of energy consumption), and reduction of CO ₂ emission can be achieved.

  In order to solve the above problems, another representative configuration of the present invention is a hybrid hot water supply system including a combustion type hot water heater as an auxiliary heat source for a heat pump hot water heater, and a hot water storage tank and a hot water supply to the hot water storage tank. A heat pump type water heater, a hot water storage amount judging means for judging whether or not the amount of hot water stored in the hot water storage tank is greater than or equal to a predetermined hot water storage amount, and a hot water storage amount judging means that Combustion type water heater for hot water supply, a number management system capable of inputting / outputting number information predicted to use the hybrid hot water supply system, a basic unit indexing unit for obtaining the amount of hot water used per person at a predetermined time, Based on at least the predicted number of people information and the amount of hot water used per person, a calculation unit that calculates the total amount of hot water required, and the calculated total amount of hot water Has been obtains the difference between the reference value of the total hot water supply amount, characterized in that it comprises a correction unit for correcting by increasing or decreasing a predetermined amount of hot water storage on the basis of this difference.

According to such a configuration, whether or not the combustion-type hot water heater can be operated is determined in consideration of at least the number of people information output from the number management system and the total hot water supply amount predicted (calculated) based on the hot water supply usage per person. The threshold value (predetermined hot water storage amount) can be increased or decreased for correction. Thereby, unnecessary operation of the combustion type water heater can be eliminated, and further reduction of running cost, improvement of energy consumption, and reduction of CO ₂ emission can be achieved.

  The hybrid hot water supply system further includes a basic unit indexing data table that stores past number information and actual data of hot water usage in association with each other, and the basic unit indexing unit is based on past number information and actual data, The amount of hot water used per person should be determined. Thereby, prediction (calculation) of the total hot water supply amount according to the field is attained.

  In order to solve the above problems, another representative configuration of the present invention is a hybrid hot water supply system including a combustion type hot water heater as an auxiliary heat source for a heat pump hot water heater, and a hot water storage tank and a hot water supply to the hot water storage tank. A heat pump type water heater, a hot water storage amount judging means for judging whether or not the amount of hot water stored in the hot water storage tank is greater than or equal to a predetermined hot water storage amount, and a hot water storage amount judging means that Combustion-type water heater for discharging hot water, supply water temperature acquisition means for acquiring supply water temperature or outside air temperature acquisition means for acquiring outside air temperature, or calendar information acquisition means for acquiring calendar information, and acquired water supply temperature or outside air temperature Or, a usage temperature prediction unit that predicts the user's approximate usage temperature from calendar information, and calculates the total amount of hot water required based on at least the predicted usage temperature. And a correction unit that obtains a difference between the calculated total hot water supply amount and a preset reference value of the total hot water supply amount, and corrects by increasing or decreasing the predetermined hot water storage amount based on the difference. Features.

According to such a configuration, the threshold value (predetermined hot water storage amount) for determining whether the combustion hot water heater can be operated is increased or decreased in consideration of the total hot water supply amount predicted (calculated) based on the approximate usage temperature of the user. Can be corrected. Thereby, unnecessary operation of the combustion type water heater can be eliminated, and further reduction of running cost, improvement of energy consumption, and reduction of CO ₂ emission can be achieved.

  The said correction | amendment part is good to convert and correct | amend the calculated | required difference to the height at the time of hot water storage in a hot water storage tank, and to increase / decrease this threshold value (predetermined hot water storage amount). Thereby, the threshold value (predetermined hot water storage amount) for determining whether or not the combustion hot water heater can be operated can be suitably corrected.

  The hot water storage tank is hermetically sealed, and has a plurality of temperature sensors arranged at different heights as hot water storage amount judging means. By selecting a temperature sensor that determines a predetermined hot water storage amount, correction by the correction unit It is good to do. Thereby, the said hybrid hot-water supply system using an enclosed hot water storage tank can be comprised suitably.

  The temperature sensor may be disposed inside the hot water storage tank or attached to the outer surface of the hot water storage tank. That is, it is desirable to directly measure the hot water temperature by arranging a temperature sensor inside the hot water storage tank, but the hybrid hot water supply system can also be introduced by attaching a plurality of temperature sensors to the outer surface of an existing hot water storage tank.

  The hot water storage tank may be an open type, and the hot water storage amount determination means may be a water level detection sensor. That is, the hybrid hot water supply system is applicable regardless of the type of hot water storage tank to be used.

According to the present invention, the operating conditions of the combustion-type water heater can be further changed in consideration of the water supply temperature and the outside air temperature that affect the hot-water discharge capacity of the heat pump water heater, and the predicted total amount of hot water supply. A hybrid hot water supply system that can reduce running costs, improve energy consumption, and reduce CO ₂ emissions can be provided.

It is a figure showing a schematic structure of a hybrid hot-water supply system concerning a 1st embodiment. It is a functional block diagram of a control device concerning a 1st embodiment. It is a figure which shows the detail of the reference value data table concerning 1st Embodiment. It is a figure explaining Example 1 to which 1st Embodiment is applied. It is a figure which shows the actual measurement data according to area | region of the water supply temperature relevant to 1st Embodiment, and external temperature. It is a figure which shows schematic structure of the hybrid hot-water supply system concerning 2nd Embodiment. It is a functional block diagram of a control device concerning a 2nd embodiment. It is a figure which shows the detail of the reference value data table concerning 2nd Embodiment. It is a figure which shows exemplarily the basic unit index data table concerning a 2nd embodiment. It is a figure explaining Example 2 to which 2nd Embodiment is applied. It is a figure which shows schematic structure of the hybrid hot-water supply system concerning 3rd Embodiment. It is a functional block diagram of a control device concerning a 3rd embodiment. It is a figure which shows the detail of the reference value data table concerning 3rd Embodiment. It is a figure explaining Example 3 to which 3rd Embodiment is applied. It is a figure which illustrates the hybrid hot-water supply system in other embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

[First embodiment]
FIG. 1 is a diagram illustrating a schematic configuration of a hybrid hot water supply system 100 according to the first embodiment. The hybrid hot water supply system 100 includes a water supply means 102, a water supply pipe 104, a temperature sensor (hereinafter referred to as a water supply temperature sensor 106) as a water supply temperature acquisition means, a hot water storage tank 110, and a temperature sensor (hereinafter referred to as hot water storage temperature) as a hot water storage amount determination means. (Referred to as sensor 112), incoming water pipe 120, heat pump type hot water heater 122, outgoing hot water pipe 124, second incoming water pipe 130, combustion hot water heater 132, second outgoing hot water pipe 134, hot water supply pipe 140, temperature sensor as hot water supply temperature acquisition means (Hereinafter referred to as a hot water supply temperature sensor 144), a temperature sensor as an outside air temperature acquisition means (hereinafter referred to as an outside air temperature sensor 150), and a control device 160. In addition, FIG. 1 shows a schematic configuration. Actually, each pipe is appropriately selected from an on-off valve, a check valve, a pressure reducing valve, a constant flow valve, a safety valve, an automatic air vent valve, a pump, and the like. Install what you need.

  The water supply means 102 is a water receiving tank, an elevated water tank, a water pipe, or the like, and supplies hot water to the hot water storage tank 110 via the water supply pipe 104 when hot water stored in the hot water storage tank 110 is used. The feed water pipe 104 is provided with a feed water temperature sensor 106, and the feed water temperature sensor 106 transmits the measured feed water temperature to the control device 160.

  The hot water storage tank 110 is a hermetically sealed type, and includes a plurality of hot water storage temperature sensors 112 arranged at different height positions. Although the hot water storage temperature sensor 112 is disposed inside the hot water storage tank 110 in the present embodiment, it may be attached to the outer surface. In the existing hot water storage tank, it is difficult to arrange (add) a plurality of hot water storage temperature sensors 112 inside, but the hot water supply system 100 can be introduced simply and easily by sticking to the outer surface.

  Each hot water storage temperature sensor 112 measures the hot water storage temperature of the hot water storage tank 110 and transmits it to the controller 160. The controller 160 determines (controls) whether or not the combustion-type hot water supply device 132 can be operated by referring to the hot water storage temperature measured by the target hot water storage temperature sensor 112a from among the transmitted hot water storage temperatures. For example, the combustion water heater 132 is operated at a hot water storage temperature of 55 ° C. or lower, and the operation of the combustion water heater 132 is stopped at a hot water storage temperature of 60 ° C. or higher. In FIG. 1, the hot water storage temperature sensor 112a targeted by the control device 160 at standard time is indicated by a black circle (the hot water storage temperature sensor 112b in FIG. 1 will be described later).

  The reason why the combustion type water heater 132 is controlled based on the hot water storage temperature is that the hot water storage temperature is an index indicating the amount of hot water stored in the hot water storage tank 110. More specifically, since the low temperature water is supplied from the water supply pipe 104 at the lower part of the hot water storage tank 110 and the high temperature water is discharged from the hot water supply pipe 124 and the second hot water supply pipe 134 at the upper part, the hot water storage temperature of the hot water storage tank 110 is generally high. Differences occur at positions A, B, and C indicated by dotted lines in FIG. Although not accurate, the image is such that water and hot water are separated and stored in the lower and upper parts of the hot water storage tank 110, respectively.

  Therefore, it is possible to determine whether hot water or water is stored at the height position where the temperature is measured based on the hot water storage temperature. That is, each hot water storage temperature sensor 112 can determine whether or not the amount of hot water stored in the hot water storage tank 110 is greater than or less than a threshold value (predetermined hot water storage amount) determined according to each height position.

  The incoming water pipe 120 extracts low temperature water from the lower part of the hot water storage tank 110 and enters the heat pump hot water heater 122. The COP (coefficient of performance) of the heat pump water heater 122 depends on the incoming water temperature and the outside air temperature. Specifically, the COP value is improved when the incoming water temperature is lower and the outside air temperature is higher.

The heat pump hot water heater 122 includes a compressor, a condenser, an expansion valve, an evaporator, an air cooling fan, and the like, and heats the low-temperature water that has entered by a so-called heat pump cycle to generate high-temperature water. In particular, in recent years, Ecocute (registered trademark) that circulates CO ₂ , which is a natural refrigerant, as a heat medium has attracted attention.

  The hot water supply pipe 124 discharges hot water generated by the heat pump hot water heater 122 to the upper part of the hot water storage tank 110. The hot water temperature at this time (the hot water temperature of the heat pump type hot water heater 122) is generally determined within the range of 40 ° C to 90 ° C. The tapping temperature is generally determined as an initial set value when the equipment is introduced.

  The second water intake pipe 130 extracts medium-temperature water or low-temperature water from the hot water storage tank 110 and enters the combustion hot water heater 132. Unlike the heat pump water heater 122, the combustion hot water heater 132 does not change the COP depending on the ambient conditions such as the incoming water temperature and the outside air temperature, and the combustion hot water heater 132 can normally enter hot water of any temperature. is there. However, as a whole, the COP of the combustion type water heater 132 is lower than that of the heat pump type water heater 122.

  The combustion hot water heater 132 is a hot water heater such as a heater or a boiler, and is used as an auxiliary heat source for the heat pump hot water heater 122. Whether or not the combustion type water heater 132 can be operated is controlled by the control device 160. The high-temperature water generated by the combustion hot water supply device 132 is discharged to the upper part of the hot water storage tank 110 through the second hot water supply pipe 134.

  The hot water supply pipe 140 includes a hot water supply temperature sensor 144 and supplies hot water to the hot water supply load 142. The temperature measured by the hot water supply temperature sensor 144 is transmitted to the control device 160.

  The outside air temperature sensor 150 measures the outside air temperature. The measured temperature is transmitted to the control device 160.

  Based on the feed water temperature and the outside air temperature, the control device 160 changes the reference for the hot water storage temperature from the hot water storage temperature sensor 112a at the standard time to the other hot water storage temperature sensor 112b. In other words, the threshold value (predetermined hot water storage amount) for determining whether or not the combustion hot water heater 132 can be operated is increased or decreased for correction. Then, the operation of the combustion type water heater 132 is controlled based on this threshold value (predetermined hot water storage amount).

  FIG. 2 is a functional block diagram of the control device 160 according to the first embodiment. The control device 160 includes a control unit 200, a temperature data acquisition unit 210, a device memory 212, a heating capacity acquisition unit 218, a calculation unit 220, and a correction unit 222.

  The control unit 200 includes a central processing unit (CPU) and controls the entire control device 160. Further, it is determined whether or not the combustion type water heater 132 can be operated.

  The temperature data acquisition unit 210 acquires (receives) each measured temperature from the water supply temperature sensor 106, the hot water storage temperature sensor 112, the hot water supply temperature sensor 144, and the outside air temperature sensor 150.

  The device memory 212 is a recording medium composed of ROM, RAM, EEPROM, nonvolatile RAM, flash memory, HDD, and the like. The device memory 212 stores a reference value data table 214 and a heat pump characteristic table 216.

  FIG. 3 is a diagram showing details of the reference value data table 214 according to the first embodiment. As shown in FIG. 3, the reference value data table 214 stores various initial set values (automatic calculation values) including a feed water temperature, a tapping temperature, and an outside air temperature, that is, reference values. In particular, the water supply temperature and the outside air temperature are set in consideration of the severest winter season, which is the most severe condition. Specifically, the observed value of AMeDAS weather data in the severe winter season is automatically input.

  The heat pump characteristic table 216 (details not shown) stores the heating capacity (kW / h), that is, the correspondence relationship of the heat pump type hot water heater 122 for each outside air temperature. And the heating capability acquisition part 218 acquires the heating capability corresponding to the outside temperature which the temperature data acquisition part 210 received with reference to the heat pump characteristic table 216.

  Based on the water supply temperature received by the temperature data acquisition unit 210, the heating capability acquired by the heating capability acquisition unit 218, and the tapping temperature of the heat pump type hot water heater 122, the calculation unit 220 is configured so that the heat pump type hot water heater 122 per unit time. The amount of hot water that can be poured into the hot water is calculated.

  The correction unit 222 obtains a difference between the hot water flow rate calculated per unit time by the arithmetic unit 220 and the reference value of the hot water flow rate per unit time stored in the reference value data table 214, and combustion is performed based on the difference. The threshold value (predetermined hot water storage amount) for determining whether or not the hot water heater 132 is operable is increased and decreased for correction. Specifically, the obtained difference is converted into a height when hot water is stored in the hot water storage tank 110. Then, the object for referring to the hot water storage temperature is changed to another hot water storage temperature sensor 112b located at a position away from the hot water storage temperature sensor 112a at the standard time by this height.

  FIG. 4 is a diagram illustrating Example 1 to which the first embodiment is applied. In particular, FIG. 4A is a diagram illustrating a flow for changing (correcting) the operating condition of the combustion type water heater 132, and FIG. 4B is a diagram illustrating measurement (calculation) data according to the first embodiment. Hereinafter, specific numerical values will be shown as the first embodiment, and the correction of the operating condition of the combustion type water heater 132 will be described in detail.

  First, the temperature data acquisition unit 210 acquires the water supply temperature and the outside air temperature (S230). Here, it is assumed that the water supply temperature is 20 ° C. and the outside air temperature is 24 ° C. as shown in FIG. Next, the heating capacity acquisition unit 218 refers to the heat pump characteristic table 216 to acquire the heating capacity of the heat pump hot water heater 122 when the outside air temperature is 24 ° C. (S232). Here, the heating capacity at 24 ° C. is 40 kW.

  Next, the calculating part 220 calculates | requires the temperature difference of the feed water temperature of the heat pump type hot water heater 122, and the tapping temperature (S234). Here, since the tapping temperature is generally set as an initial set value, the same value (65 ° C.) as the reference value can be used. Therefore, the temperature difference is 45 ° C. Note that S232 and S234 are out of order.

Next, the hot water flow rate per unit time is calculated from the heating capacity acquired in S232 and the temperature difference obtained in S234 (S236). That is, since the heating capacity is 40 kW and the temperature difference is 45 ° C., the discharged hot water flow rate per unit time is calculated as follows.
40 kW × 860 kcal / h · kW ÷ 45 ° C. = 764 L / h
Here, 860 kcal / h is the amount of heat generated per hour from 1 kW of power.

  In addition, although the tap water flow rate per hour is calculated here, it is not necessarily limited to this. As the unit time, a convenient unit such as a hot water flow rate per day may be adopted according to the capacity of the hot water storage tank 110 or the like.

Next, the correction unit 222 calculates a difference between the hot water flow rate 764 L / h (calculated value) per unit time and the reference value 591 L / h stored in the reference value data table 216 (calculated value−reference value), 173 L / h. h is obtained (S238). Next, the difference 173 L / h obtained by the correction unit 222 is divided by the bottom area 1.5 m ² of the hot water storage tank 110 stored in the reference value data table 216, and the height when the hot water is stored in the hot water storage tank 110 is 116 mm. (S240).

  Next, as shown in FIG. 1, the correction unit 222 changes the reference object of the measured temperature from the hot water storage temperature sensor 112a at the standard time to another hot water storage temperature sensor 112b at a height of 116 mm (S242). Thus, whether or not the combustion-type hot water heater 132 is operable is determined based on the hot water storage temperature measured by the hot water storage temperature sensor 112b.

The first embodiment of the present invention has been described in detail above. According to the first embodiment, the threshold of the hot water storage tank 110 (predetermined whether or not the combustion hot water heater 132 can be operated is determined in consideration of the feed water temperature and the outside air temperature that affect the hot water discharge capacity of the heat pump hot water heater 122. The amount of hot water storage) can be increased or decreased for correction. Thus, by delaying the operation of the combustion hot water heater 132 by an amount corresponding to the increase in the hot water supply capacity of the heat pump hot water heater 122, unnecessary operation of the combustion hot water heater 132 can be eliminated, and the running cost can be further reduced. , Improve energy consumption and reduce CO ₂ emissions.

  In addition, FIG. 5 is a figure which shows the monthly actual measurement data for every area | region of the water supply temperature relevant to 1st Embodiment, and external temperature. As shown in FIG. 5, a difference of up to 24.7 ° C. at the feed water temperature and a maximum of 27.1 ° C. at the outside air temperature can occur. From this, it is clear that this embodiment can have a very great effect.

[Second Embodiment]
FIG. 6 is a diagram illustrating a schematic configuration of a hybrid hot water supply system 300 according to the second embodiment. FIG. 7 is a functional block diagram of the control device 360 according to the second embodiment. The same parts as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

  In the first embodiment, the threshold value (predetermined hot water storage amount) of the hot water storage tank 110 for determining whether the combustion hot water heater 132 is operable is corrected based on the water supply temperature, the outside air temperature, and the like. In the second embodiment, the threshold value (predetermined hot water storage amount) of the hot water storage tank 110 for determining whether or not the combustion hot water heater 132 is operable is corrected based on the predicted total hot water supply amount and the like. That is, the difference of the second embodiment from the first embodiment is that the flow meter 342 and the number of people management system 358 are further provided, and the control device 360 is different.

  The flow meter 342 is provided in the water supply pipe 104 and measures the flow rate of the water supply, that is, the amount of hot water used. Then, the measured flow rate is transmitted to the control device 360. In the present embodiment, the flow meter 342 is disposed in the water supply pipe 104, but may be disposed in the hot water supply pipe 140.

  The number of people management system 358 is a device that can input / output the number of people information predicted to use the hybrid hot water supply system 100 such as a hotel accommodation management system, a hospital inpatient management system, or another customer information management system (reuse). it can. The number information input to the number management system 358 is transmitted to the control device 360 as needed.

  The control device 360 includes a control unit 200, a number information acquisition unit 408, a temperature data acquisition unit 210, a flow rate data acquisition unit 410, a device memory 412, a basic unit indexing unit 418, a calculation unit 420, and a correction unit 422. The device memory 412 has a reference value data table 414 and a basic unit index data table 416.

  The number information acquisition unit 408 acquires number information from the number management system 358. Further, the flow rate data acquisition unit 410 acquires (receives) the flow rate (hot water supply usage amount) measured from the flow meter 342.

  FIG. 8 is a diagram showing details of the reference value data table 414 according to the second embodiment. As shown in FIG. 8A, the reference value data table 414 stores at least the industry type, the measurement basic unit, the number information, and the initial set value of the total hot water supply amount per day. In particular, the initial setting value of the measurement basic unit is set in consideration of the measurement basic unit for each industry shown as an example in FIG.

  FIG. 9 is a diagram exemplarily showing the basic unit index data table 416 according to the second embodiment. As shown in FIG. 9, the basic unit index data table 416 stores at least the number of people information acquired by the number of people information acquisition unit 408 and the flow rate acquired by the flow rate data acquisition unit 410, that is, the actual data of hot water usage. ing. In the present embodiment, in the basic unit index data table 416, past number information and actual performance data of hot water supply usage are stored in association with each other based on the date, day of the week, and the like. Further, the amount of hot water used per person (hereinafter referred to as a measurement basic unit) for a predetermined time determined by the basic unit indexing unit 418 is stored in the basic unit index data table 416.

  The basic unit indexing unit 418 obtains a measurement basic unit by referring to past number information and actual hot water consumption data stored in the basic unit index data table 416. This measurement basic unit is determined based on various (arbitrary) methods. As described above, the calculated value is stored in the basic unit index data table 416.

  To specifically illustrate various (arbitrary) systems, as shown in FIG. 9, the annual average value may be simply calculated, or the measurement basic unit may be calculated as the average value for each day of the week. In addition, A, B, and C are ranked, A is 1.2 times the annual average, B is 1.0 times the annual average, and C is 0.8 times the annual average. May be stored in the basic unit index data table 416. Thus, by making it possible to determine the measurement basic unit by the method desired by the user, it becomes possible to predict (calculate) the total amount of hot water supply in accordance with the site. In addition, when there is unexpected data in the calculation of these average values, it is preferable that the data can be excluded from the calculation of the measurement basic unit.

  The calculation unit 420 calculates the required total amount of hot water supply based on the number of people information acquired by the number of people information acquisition unit 408 and the measurement basic unit calculated by the basic unit index data table 416. At this time, for example, when the annual average value or the average value for each day of the week is used as the measurement basic unit, the calculation unit 420 automatically corresponds (when the measurement basic unit calculated for each day of the week is used). It can be constructed to refer to the basic unit index data table 416 (of the day of the week). In addition, when using a measurement basic unit that is ranked A as 1.2 times, B as 1.0 times, and C as 0.8 times, which rank should be used as the measurement basic unit for the predicted day? It is preferable that the user can input from the outside with a button or the like.

  The correction unit 422 obtains a difference between the total hot water supply amount (predicted value) calculated per day by the arithmetic unit 420 and the reference value of the total hot water supply amount per day stored in the reference value data table 414, and uses this difference as a difference. Based on this, the threshold value (predetermined hot water storage amount) for determining whether or not the combustion hot water heater 132 can be operated is increased and decreased for correction. Specifically, the difference in the total hot water supply amount is converted into the height when hot water is stored in the hot water storage tank 110. Then, the object for referring to the hot water storage temperature is changed to another hot water storage temperature sensor 112b located at a position away from the hot water storage temperature sensor 112a at the standard time by this height.

  FIG. 10 is a diagram illustrating Example 2 to which the second embodiment is applied. In particular, FIG. 10A is a diagram illustrating a flow for changing (correcting) the operating condition of the combustion type water heater 132, and FIG. 10B is a diagram illustrating measurement (calculation) data according to the second embodiment. Hereinafter, specific numerical values will be shown as the second embodiment, and the correction of the operating condition of the combustion type water heater 132 will be described in detail.

  First, the number of people information acquisition unit 408 acquires the number of people information predicted the next day from the number of people management system 358 (S430). Here, as shown in FIG. 10B, it is assumed that the number information is 88 people.

  Next, the calculation part 420 calculates | requires a measurement basic unit from the past number information stored in the basic unit index data table 416, and the performance data of hot water supply usage (S432). Here, it is assumed that an average value 206 L / person / day calculated from past number information and actual data of hot water consumption is used as a measurement basic unit. Note that S430 and S432 are in no particular order.

  Next, the total hot water supply amount required for the next day is calculated from the number information acquired in S430 by the calculation unit 420 and the measurement basic unit obtained in S432 (S434). That is, since the number information is 88 people and the measurement basic unit is 206 L / person / day, the total amount of hot water required for the next day is calculated to be 18111 L / day by multiplying them.

Next, the correction unit 422 determines the difference between the total hot water supply amount 18111L (predicted value) required on the next day and the reference value 20000L / day of the total hot water supply amount stored in the reference value data table 416 (reference value-predicted value). , 1889L / day is obtained (S436). Next, the difference 1889 L / day obtained by the correction unit 422 is divided by the bottom area 1.5 m ² of the hot water storage tank 110 stored in the reference value data table 416, and the height when the hot water is stored in the hot water storage tank 110 is 1259 mm. (S438).

  Next, as shown in FIG. 6, the correction | amendment part 422 changes the object which refers measured temperature to the other hot water storage temperature sensor 112b in the height of 1259 mm from the hot water storage temperature sensor 112a of a standard time (S440). That is, whether or not the combustion type water heater 132 is operable is determined based on the hot water storage temperature measured by the hot water storage temperature sensor 112b.

The second embodiment of the present invention has been described in detail above. According to the second embodiment, whether or not the combustion water heater 132 can be operated is determined in consideration of at least the number of people information output from the number of people management system 358 and the total hot water supply amount predicted (calculated) based on the measurement basic unit. The threshold value (predetermined hot water storage amount) determined can be increased or decreased for correction. Thereby, unnecessary operation of the combustion type water heater 132 can be eliminated, and further reduction of running cost, improvement of energy consumption, and reduction of CO ₂ emission can be achieved.

[Third embodiment]
FIG. 11 is a diagram illustrating a schematic configuration of a hybrid hot water supply system 500 according to the third embodiment. FIG. 12 is a functional block diagram of the control device 560 according to the third embodiment. The same parts as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

  In the first embodiment, the threshold value (predetermined hot water storage amount) of the hot water storage tank 110 for determining whether the combustion hot water heater 132 is operable is corrected based on the water supply temperature, the outside air temperature, and the like. In the third embodiment, the threshold value of the hot water storage tank 110 (predetermined hot water storage amount) for determining whether or not the combustion hot water heater 132 can be operated based on the total hot water supply amount predicted (calculated) from the user's approximate use temperature. Increase or decrease to correct. That is, the third embodiment is different from the first embodiment in that the second water supply means 540, the second water supply pipe 542, and the mixing valve 544 are further provided and the control device 560 is different.

  The second water supply means 540 is not controlled by the control device 560, but the user adjusts the mixing valve 544 by operating the currant (hot water supply load 142) at hand, and mixes the hot and cold water to a desired temperature. adjust. That is, the hot water supply pipe 140 and the second water supply pipe 542 are arranged in parallel up to the user's hand, and the user arbitrarily mixes hot water supply (high temperature water) and water supply (low temperature water). To reiterate, the third embodiment focuses on the fact that the user's desired temperature, that is, the user's approximate use temperature varies depending on the season and temperature.

  The control device 560 includes a control unit 200, a temperature data acquisition unit 210, a calendar 610 as a calendar information acquisition unit, a device memory 612, a use temperature prediction unit 618, a calculation unit 620, and a correction unit 622. The device memory 612 has a reference value data table 614.

  The calendar 610 holds calendar information. Then, the calendar information of the day on which the total hot water supply amount is predicted is transferred to the use temperature prediction unit 618. The calendar information may be a date, but may be divided into seasonal units, monthly units, weekly units, or the like. Furthermore, it is possible to classify special periods such as mid-term, which is the period between spring, summer, autumn and winter, the rainy season, Golden Week, and Bonsai New Year. In the present embodiment, a description will be given taking seasonal units as an example.

  FIG. 13 is a diagram showing details of the reference value data table 614 according to the third embodiment. As shown in FIG. 13, the reference value data table 614 stores an initial set value of the reference use temperature, a use temperature for each season (summer, intermediate, winter), and the like. The initial set value of the reference usage temperature is set assuming the severest winter season, which is the most severe condition. Further, although not shown, the use temperature for each of the water supply temperature and the outside air temperature may be stored in the reference value data table 614. In this embodiment, the total amount of hot water supply per day is a 60 ° C. converted value (the amount of hot water required for 60 ° C. hot water).

  The use temperature prediction unit 618 refers to the reference value data table 614 in which the use temperature and the like for each season (summer, intermediate, and winter) are stored, or the water supply temperature acquired (received) by the temperature data acquisition unit 210 or The user's approximate use temperature is predicted from the outside air temperature or the calendar information of the calendar 610.

  The calculating part 620 calculates the total amount of hot water supply required based on the predicted use temperature. Further, the correction unit 622 obtains a difference between the total hot water supply amount (predicted value) per day by the calculation unit 620 and the reference value of the total hot water supply amount per day stored in the reference value data table 614, and based on this difference. Then, the threshold value (predetermined hot water storage amount) for determining whether or not the combustion type water heater 132 is operable is increased or decreased for correction. Specifically, the difference in the total hot water supply amount is converted into the height when hot water is stored in the hot water storage tank 110. Then, the object for referring to the hot water storage temperature is changed to another hot water storage temperature sensor 112b located at a position away from the hot water storage temperature sensor 112a at the standard time by this height.

  FIG. 14 is a diagram illustrating Example 3 to which the third embodiment is applied. In particular, FIG. 14A is a diagram illustrating a flow of changing (correcting) the operating condition of the combustion type water heater 132, and FIG. 14B is a diagram illustrating measurement (calculation) data according to the third embodiment. Hereinafter, specific numerical values will be shown as the third embodiment, and the correction of the operating condition of the combustion type water heater 132 will be described in detail.

  First, the use temperature prediction unit 618 predicts the approximate use temperature of the user from the water supply temperature or the outside air temperature, or calendar information (S630). Here, as shown in FIG.14 (b), utilization temperature shall be 38 degreeC.

Next, the calculation unit 620 calculates the required total hot water supply amount from the predicted use temperature, the total hot water supply amount per day (reference value) and the reference use temperature stored in the reference value data table 614 ( S632). That is, since the predicted use temperature is 38 ° C., the total hot water supply amount per day (reference value) is 20000 L / day, and the reference use temperature is 42 ° C., the required total hot water supply amount is calculated as follows.
20000 L / day × 38 ° C./42° C. = 18095 L / day

Next, the correction unit 622 determines the difference between the required total hot water supply amount 18095 L / day (predicted value) and the reference value 20000 L / day of the total hot water supply amount stored in the reference value data table 416 (reference value−predicted value). ), 1905 L / day is obtained (S634). Next, the height when the correction unit 622 divides the obtained difference 1905 L / day by the bottom area 1.5 m ² of the hot water storage tank 110 stored in the reference value data table 416 and stores the hot water in the hot water storage tank 110. Converted to 1270 mm (S636).

  Next, as shown in FIG. 11, the correction unit 622 changes the target for referring to the measured temperature from the hot water storage temperature sensor 112a at the standard time to another hot water storage temperature sensor 112b at a height of 1270 mm (S638). That is, whether or not the combustion type water heater 132 is operable is determined based on the hot water storage temperature measured by the hot water storage temperature sensor 112b.

The third embodiment of the present invention has been described in detail above. According to the third embodiment, the threshold value (predetermined hot water storage amount) for determining whether or not the combustion hot water heater 132 can be operated in consideration of the total hot water supply amount predicted (calculated) based on the approximate usage temperature of the user. ) To increase or decrease. Thereby, unnecessary operation of the combustion type water heater 132 can be eliminated, and further reduction of running cost, improvement of energy consumption, and reduction of CO ₂ emission can be achieved.

[Other embodiments]
FIG. 15 is a diagram illustrating a hybrid hot water supply system 700 according to another embodiment. In the first to third embodiments, the configuration using the sealed hot water storage tank 110 has been described. In the present embodiment, a hybrid hot water supply system 700 that employs an open hot water storage tank 710 will be described. In addition, about the part which overlaps with the said 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The hybrid hot water supply system 700 includes a water supply means 102, a water supply temperature sensor 106, a water inlet pipe 720, a heat pump hot water heater 122, a combustion hot water heater 132, a hot water outlet pipe 724, a hot water storage tank 710, a water level detection sensor 712 as a hot water storage amount determination means, A hot water supply pipe 140, a hot water supply temperature sensor 144, an outside air temperature sensor 150, and a control device 160 are included.

  The water inlet pipe 720 enters the water flowing in from the water supply means 102 into the heat pump hot water heater 122 or the combustion hot water heater 132. The hot water supply pipe 724 discharges hot water generated by the heat pump hot water heater 122 and the combustion hot water heater 132 to the hot water storage tank 710.

  The hot water storage tank 710 is an open type, and high temperature water generated by the heat pump hot water heater 122 and the combustion hot water heater 132 is stored therein. That is, the hot water storage tank 710 is not directly supplied with low-temperature water like the sealed hot water storage tank 110.

  Therefore, in the open-type hot water storage tank 710, the water level detection sensor 712 detects the water level (the height of the water surface 726), whereby the amount of stored hot water is determined. Then, the operation of the heat pump hot water heater 122 and the combustion hot water heater 132 is controlled based on the detected hot water storage amount. Note that the amount of hot water stored in the hot water storage tank 710 may be determined by inserting a water pressure sensor at the height of the hot water supply pipe 140 and detecting the water pressure.

  Therefore, the method for changing the operating condition of the combustion type hot water heater 132 described above in the first to third embodiments is also used in the hybrid water supply system 700 (open hot water storage tank 710) in the present embodiment. It can be similarly applied by switching the threshold value of water level (predetermined hot water storage amount) for determining whether or not the hot water heater 132 can be operated.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  INDUSTRIAL APPLICABILITY The present invention can be used for a hybrid hot water supply system including a combustion hot water heater as an auxiliary heat source for a heat pump hot water heater.

DESCRIPTION OF SYMBOLS 100, 300, 500, 700 ... Hybrid hot water supply system, 102 ... Water supply means, 104 ... Water supply piping, 106 ... Water supply temperature sensor, 110, 710 ... Hot water storage tank, 112 ... Hot water storage temperature sensor, 120 ... Water supply piping, 122 ... Heat pump type Hot water heaters 124, 724 ... Hot water piping, 130 ... Second incoming water piping, 132 ... Combustion hot water heater, 134 ... Second hot water piping, 140 ... Hot water supply piping, 142 ... Hot water supply load, 144 ... Hot water temperature sensor, 150 ... Outside air Temperature sensor, 160, 360, 560 ... control device, 200 ... control unit, 210 ... temperature data acquisition unit, 212, 412, 612 ... device memory, 214, 414, 614 ... reference value data table, 216 ... heat pump characteristic table, 218 ... Heating capacity acquisition unit, 220, 420, 620 ... Calculation unit, 222, 422, DESCRIPTION OF SYMBOLS 22 ... Correction | amendment part, 342 ... Flowmeter, 358 ... Person number management system, 408 ... Person number information acquisition part, 410 ... Flow volume data acquisition part, 416 ... Basic unit index data table, 418 ... Basic unit index part, 540 ... No. 2 water supply means, 542 ... 2nd water supply pipe, 544 ... mixing valve, 610 ... calendar, 618 ... utilization temperature prediction part, 712 ... water level detection sensor, 720 ... water intake pipe, 726 ... water surface

Claims (8)

A hybrid hot water system comprising a combustion water heater as an auxiliary heat source for a heat pump water heater,
A hot water storage tank,
A heat pump type water heater for discharging water to the hot water storage tank;
Hot water storage amount judging means for judging whether or not the hot water storage amount of the hot water storage tank is equal to or greater than a predetermined hot water storage amount;
A combustion hot water supply device for discharging hot water to the hot water storage tank when the hot water storage amount determining means determines that the hot water storage amount is less than the predetermined hot water storage amount;
Water supply temperature acquisition means for acquiring the water supply temperature;
Outside temperature acquisition means for acquiring outside temperature;
A heat pump characteristic table in which the correspondence between the heating capacity of the heat pump water heater and the outside air temperature is stored;
With reference to the heat pump characteristic table, a heating capacity acquisition unit that acquires the heating capacity corresponding to the acquired outside air temperature;
An operation for calculating a flow rate of hot water that can be discharged by the heat pump water heater per unit time based on at least the acquired water temperature and heating capacity, and the hot water temperature of the heat pump water heater with respect to the hot water storage tank. And
A correction unit that calculates a difference between the calculated hot water flow rate and a preset reference value of the hot water flow rate, and corrects the predetermined hot water storage amount based on the difference;
A hot water supply system characterized by comprising: A hybrid hot water system comprising a combustion water heater as an auxiliary heat source for a heat pump water heater,
A hot water storage tank,
A heat pump type water heater for discharging water to the hot water storage tank;
Hot water storage amount judging means for judging whether or not the hot water storage amount of the hot water storage tank is equal to or greater than a predetermined hot water storage amount;
A combustion hot water supply device for discharging hot water to the hot water storage tank when the hot water storage amount determining means determines that the hot water storage amount is less than the predetermined hot water storage amount;
Number of people management system that can input and output the number of people information predicted to use the hybrid hot water system,
A basic unit indexing unit that calculates the amount of hot water used per person at a given time,
An arithmetic unit that calculates a required total hot water supply amount based on at least the predicted number of people information and the hot water supply usage per person,
A correction unit that obtains a difference between the calculated total hot water supply amount and a preset reference value of the total hot water supply amount, and corrects the predetermined hot water storage amount by increasing or decreasing based on the difference;
A hot water supply system characterized by comprising: It further comprises a basic unit index data table for storing past number information and actual data of hot water consumption in association with each other,
3. The hybrid hot water supply system according to claim 2, wherein the basic unit indexing unit obtains the amount of hot water used per person based on the past number of people information and the actual data. A hybrid hot water system comprising a combustion water heater as an auxiliary heat source for a heat pump water heater,
A hot water storage tank,
A heat pump type water heater for discharging water to the hot water storage tank;
Hot water storage amount judging means for judging whether or not the hot water storage amount of the hot water storage tank is equal to or greater than a predetermined hot water storage amount;
A combustion hot water supply device for discharging hot water to the hot water storage tank when the hot water storage amount determining means determines that the hot water storage amount is less than the predetermined hot water storage amount;
A feed water temperature obtaining means for obtaining a feed water temperature, an outside air temperature obtaining means for obtaining an outside air temperature, or a calendar information obtaining means for obtaining calendar information;
A use temperature prediction unit that predicts an approximate use temperature of the user from the acquired water supply temperature or outside air temperature, or the calendar information;
An arithmetic unit that calculates a required total hot water supply amount based on at least the predicted use temperature;
A correction unit that obtains a difference between the calculated total hot water supply amount and a preset reference value of the total hot water supply amount, and corrects the predetermined hot water storage amount by increasing or decreasing based on the difference;
A hot water supply system characterized by comprising:   The said correction | amendment part converts the calculated | required difference into the height at the time of storing hot water in the said hot water storage tank, and increases / decreases the said predetermined | prescribed hot water storage amount by this height. The hybrid hot water supply system according to claim 1. The hot water storage tank is hermetically sealed,
A plurality of temperature sensors arranged at different heights as the hot water storage amount judging means are provided,
The hybrid hot water supply system according to any one of claims 1 to 5, wherein the correction by the correction unit is performed by selecting the temperature sensor that determines the predetermined hot water storage amount.   The hybrid hot water supply system according to claim 6, wherein the temperature sensor is disposed inside the hot water storage tank or attached to an outer surface of the hot water storage tank. The hot water storage tank is an open type,
The hybrid hot water supply system according to any one of claims 1 to 5, wherein the hot water storage amount determination means is a water level detection sensor.

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