JP5136451B2 - Water heater - Google Patents

Description

  The present invention relates to a water heater that uses boiled hot water stored in a hot water storage tank.

  Conventionally, this kind of hot water supply has a thing like FIG. 3, for example (for example, refer patent document 1).

FIG. 3 shows a conventional water heater described in Patent Document 1. As shown in FIG. As shown in FIG. 3, a hot water tank 1 and a heating means 2 for heating the water in the hot water tank 1 are provided, and one day is divided into a plurality of time zones, and the amount of heat used in each time zone is stored. The heating heat amount determining means 3 for controlling the heating means 2 is provided so that the necessary heat amount can be secured for each time zone.
JP 2007-147246 A

  However, in the above-described conventional configuration, hot water is prevented from running out by keeping the required amount of water heated up before the corresponding time zone. However, if the usage pattern is constant every day, the amount of hot water stored and used Although the amount will match, if the irregularity is high, there will be a problem that the hot water will run out without boiling where it must be boiled, or the water will boil up and not be used.

  In order to avoid this, there is a problem that if a certain amount of allowance is observed for each time zone, the amount of boiling becomes excessive as a result and waste increases.

  The present invention solves the above-described conventional problems, and provides a hot water supply apparatus that can increase or decrease the amount of hot water that can be used in consideration of the characteristics of the hot water usage pattern and can achieve high efficiency without causing hot water to run out. For the purpose.

  In order to solve the above-mentioned conventional problems, the water heater of the present invention includes a hot water storage tank, heating means for heating the water in the hot water storage tank, boiling heat amount determination means for determining the amount of boiling heat by the heating means, The utilization heat amount measuring means for measuring the amount of heat used by the hot water supply by the user and the boiling heat amount determination means are configured to determine the utilization heat amount measured by the utilization heat amount measurement means up to the previous day for a predetermined period of time. Based on the stored contents of the used heat quantity storage means, the basic heating heat quantity calculating means for calculating the heating heat quantity for the day from the average value and the deviation value of the used heat quantity per day, based on the stored contents of the used heat quantity storage means, Boiling heat amount correction means for correcting a calculation result by the basic boiling heat amount calculation means based on variations in daily usage patterns is provided.

  As a result, the amount of hot water to be boiled is determined based on the average value and the deviation value of the total amount of hot water used in a day, and the amount of hot water is increased or decreased according to the irregularity of the usage pattern. When difficult irregularities are high, it is increased so that it is safer against running out of hot water, and when irregularities are low, it is reduced to contribute to improving efficiency. And operation control that can achieve both energy savings.

According to the present invention, the supply amount of hot water that can be used in consideration of the characteristics of the hot water usage pattern is increased or decreased,
It is possible to provide a water heater that can obtain high efficiency without causing hot water to run out.

  1st invention is a hot water storage tank, the heating means which heats the water of the said hot water tank, the boiling heat amount determination means which determines the amount of boiling heat by the said heating means, and the utilization heat quantity which measures the hot water use heat amount by a user The measuring means and the heating heat quantity determining means are used heat quantity storage means for storing the used heat quantity measured up to the previous day measured by the used heat quantity measuring means at predetermined time intervals for a predetermined period, and the used heat quantity. Based on the storage contents of the storage means, the basic boiling heat amount calculating means for calculating the heating heat amount for the day from the average value and deviation value of the daily used heat amount, and the basic based on the variation of the daily use pattern A heating heat quantity correction unit for correcting the calculation result by the boiling heat quantity calculation unit is provided.

  As a result, the amount of boiling water is increased with respect to the basic boiling heat amount so that it is safer against running out of hot water when the irregularity is difficult to predict, and it is decreased when the irregularity is low. Since it contributes to efficiency improvement, it becomes possible to perform operation control that can achieve both user-friendliness and energy-saving performance adapted to the user's usage pattern.

  The second invention is characterized in that the heating means is configured to use a heat pump cycle. As a result, it is possible to apply a boiling temperature as low as possible only when the amount of hot water used is large, resulting in high efficiency. The characteristics of can be drawn to the maximum.

  The third invention is characterized in that the heat pump cycle is a supercritical refrigerant circuit in which the high side pressure exceeds the critical pressure during operation, and since the boiling temperature can be increased, the amount of heat that can be used is increased. The ability to prevent running out of hot water can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration of a water heater in the first embodiment of the present invention.

  In FIG. 1, a hot water tank 1, a heat pump unit 2 as a heating means for heating the water in the hot water tank 1, and hot water tank temperature detection as a use calorific value measuring means for detecting the temperature of hot water coming out of the hot water tank 1 when hot water is supplied. Means 4, a feed water flow rate detecting means 5 for detecting the feed water flow rate flowing into the hot water tank 1 at the time of hot water supply, a feed water temperature detecting means 6, a hot water tank hot water temperature detecting means 4 serving as a heat quantity measuring means, and a feed water flow rate detecting means. Heating amount determining means 3 is provided for determining the amount of heat used from the means 5 and the feed water temperature detecting means 6 and determining the amount of heat heated for the day based on the stored amount of heat used for a certain period in the past.

  Further, the heating heat quantity determination means 3 obtains the heating heat quantity based on the average value and the deviation value of the used heat quantity for the past week stored in the used heat quantity storage means 7 for storing the used heat quantity. The basic boiling heat amount calculation means 8 divides a day into a plurality of time zones, calculates the degree of use pattern variation from the average value and deviation value of the past week for each time zone, and calculates the basic boiling heat amount calculation. It comprises boiling heat amount correcting means 9 for correcting the amount of heating heat obtained by the means 8.

  About the hot water heater comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

As a basic operation, the hot water tank 1 is filled with a lot of low-temperature water before boiling, and when the operation is started, it is sent from the heat pump outlet 11 to the heat pump unit 2 by the circulating pump 10 for boiling. The heated hot water is returned to the hot water tank 1 from the heat pump return port 12.

  Accordingly, hot water is stored in the hot water tank 1 sequentially from above. When hot water is used after boiling, hot water in the hot water storage tank 1 is sent from the hot water supply port 13, and this hot water is adjusted to the hot water temperature set by the hot water and the hot water mixing valve 15 from the hot water supply pipe 14. Supplied from the hot water tap 16. Further, water corresponding to the amount of hot water used for hot water supply flows from the water supply port 17 at the lower part of the hot water tank 1 through the water supply pipe 14.

  Here, the water heater of the present embodiment contributes to energy saving by reducing the excess of hot water by determining the appropriate amount of boiling water for the day according to how the user uses the hot water, and is easy to use due to running out of hot water. It has a function to prevent deterioration.

  FIG. 2 shows a conceptual diagram of stored values and calculated values of the amount of heat used.

  In FIG. 2, 18 is the amount of heat used from one day before to seven days ago for each of the time zones (1) to (6) stored in the used heat amount storage means 6. The values of these used heat amounts are calculated by multiplying the difference between the hot water tank temperature and the feed water temperature by the feed water flow rate from the outputs of the hot water tank hot water temperature detecting means 4, the feed water flow rate detecting means 5 and the feed water temperature detecting means 6. It is.

  The basic boiling heat amount calculation means 8 calculates the daily total value 19 by summing up the amount of heat used in the past week for each day, and calculates the daily average value / standard deviation 20 from these daily total values 19. Based on the daily average value / deviation value 20, the average value and the standard deviation are summed as the amount of heat to be heated that day, and this is used as the basic amount of heat to be heated.

  Further, the boiling heat quantity correction means 9 calculates the coefficient of variation by dividing the standard deviation by the average value using the average value / standard deviation 21 for each time period obtained for each time period (1) to (6). These are averaged to obtain an average variation coefficient 22 for each time zone. This value indicates the variation in usage pattern, and the larger the value, the greater the risk of running out of hot water. Based on the magnitude of this value, the basic boiling heat amount obtained by the basic boiling heat amount calculation means 8 is corrected.

  That is, if the value is small, the basic boiling heat amount is corrected to be small in accordance with the value to improve energy saving, and conversely if large, the basic boiling heat amount is corrected to be large to reduce the risk of running out of hot water.

  As described above, the amount of boiling water determined by the average value and standard deviation of the daily heat usage for one week is changed to the irregularity of the usage pattern obtained from the average value and standard deviation of the heat usage divided for each time zone. Therefore, it is adapted to the usage pattern because it contributes to efficiency improvement by increasing it to be safer against hot water when it is difficult to predict irregularities and reducing it when it is low Operation control that can achieve both usability and energy saving is possible.

  The refrigeration cycle of the heat pump unit 2 preferably uses carbon dioxide as a refrigerant and is operated at a pressure exceeding the critical pressure. Since the boiling temperature can be increased by using carbon dioxide as a refrigerant, it is possible to increase the amount of heat that can be used and to prevent the hot water from running out.

As described above, since the water heater according to the present invention can realize a control method that achieves both high efficiency and convenience, it can be applied to a hot water storage tank of a domestic water heater as described above, as well as a heat source and a hot water tank. It can also be applied to large-scale applications such as for business use in a system having a high level of convenience for facility managers.

Configuration diagram of a water heater in Embodiment 1 of the present invention Conceptual diagram of stored value and calculated value of the same amount of heat used Configuration of a conventional water heater

DESCRIPTION OF SYMBOLS 1 Hot water tank 2 Heating means 3 Boiling calorie | heat amount determination means 4 Hot water tank hot water temperature detection means (utilization calorie | heat amount measurement means)
5 Supply water flow rate detection means (utilization heat quantity measurement means)
6 Water supply temperature detection means (utilization heat quantity measurement means)
7 Use heat quantity storage means 8 Basic boiling heat quantity calculation means 9 Boiling heat quantity correction means

Claims (3)

A hot water storage tank, heating means for heating the water in the hot water tank, boiling heat amount determining means for determining the amount of boiling heat by the heating means, utilization heat amount measuring means for measuring the amount of heat used by the user for hot water supply, and the boiling The increased heat amount determining means includes a used heat amount storage means for storing the used heat amount up to the previous day measured by the used heat amount measuring means for a predetermined period of time, and a stored content of the used heat amount storage means. Based on the basic heating heat amount calculation means for calculating the heating heat amount of the day from the average value and deviation value of the daily use heat amount, and based on the variation of the daily use pattern, the basic heating heat amount calculation means A water heater comprising a boiling heat amount correction means for correcting a calculation result. The water heater according to claim 1, wherein the heating means is configured to use a heat pump cycle. The water heater according to claim 2, wherein the heat pump cycle is a supercritical refrigerant circuit in which a high side pressure exceeds a critical pressure during operation.

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