JP5734882B2 - Hot water storage water heater - Google Patents

Hot water storage water heater Download PDF

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JP5734882B2
JP5734882B2 JP2012011432A JP2012011432A JP5734882B2 JP 5734882 B2 JP5734882 B2 JP 5734882B2 JP 2012011432 A JP2012011432 A JP 2012011432A JP 2012011432 A JP2012011432 A JP 2012011432A JP 5734882 B2 JP5734882 B2 JP 5734882B2
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和也 佐山
和也 佐山
本間　誠
誠 本間
誠 森田
誠 森田
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Corona Corp
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本発明は、貯湯タンク内に貯湯されている湯水を加熱手段で沸き上げる貯湯式給湯装置に関するものである。   The present invention relates to a hot water storage type hot water supply apparatus for boiling hot water stored in a hot water storage tank by a heating means.

従来より、この種の貯湯式給湯装置においては、特許文献１に示されるように、湯水を貯湯する貯湯タンクと、前記貯湯タンク内の湯水を沸き上げる加熱手段と、前記貯湯タンク内の湯水を給湯する給湯管と、沸き上げ運転の昼夜運転比率が異なる複数の沸き上げモードのうち一つを選択可能な沸き上げモード選択手段と、を備え、過去の給湯実績に応じた給湯使用量に所定の放熱ロス係数を乗じて沸き上げ目標湯量を算出し、選択された沸き上げモードに応じて沸き上げ目標湯量を沸き上げるようにするものがある。   Conventionally, in this type of hot water storage type hot water supply apparatus, as shown in Patent Document 1, a hot water storage tank for storing hot water, heating means for boiling hot water in the hot water storage tank, and hot water in the hot water storage tank are provided. A hot water supply pipe for supplying hot water and a boiling mode selection means that can select one of a plurality of boiling modes with different day / night operation ratios of the boiling operation, and a predetermined amount of hot water used according to past hot water supply results There is one that calculates the boiling target hot water amount by multiplying the heat dissipation loss coefficient of the above and raises the boiling target hot water amount according to the selected boiling mode.

特開２００４−２３３００３号公報Japanese Patent Laid-Open No. 2004-233003

ところが、この従来のものでは、所定の放熱ロス係数が一定であるため、複数の沸き上げモードのうちの一つである深夜のみモードで湯切れをしないように所定の放熱ロス係数を決めると、深夜時間帯に加えて昼間時間帯でも沸き上げる標準モードでは、放熱ロスが相対的に少なくなるため、湯余りが生じてしまう。逆に標準モードに合わせて所定の放熱ロス係数を決めると、深夜のみモードでは、湯切れが生じてしまうという問題があった。   However, in this conventional one, since the predetermined heat dissipation loss coefficient is constant, when the predetermined heat dissipation loss coefficient is determined so as not to run out of water only at midnight, which is one of a plurality of boiling modes, In the standard mode that heats up in the daytime time zone in addition to the midnight time zone, the heat dissipation loss is relatively reduced, resulting in a surplus of hot water. Conversely, if a predetermined heat dissipation loss coefficient is determined in accordance with the standard mode, there is a problem that hot water runs out in the midnight only mode.

そこで、本発明は上記課題を解決するため、湯水を貯湯する貯湯タンクと、前記貯湯タンク内の湯水を沸き上げる加熱手段と、前記貯湯タンク内の湯水を給湯する給湯管と、前記貯湯タンク内の湯水を前記加熱手段で沸き上げる沸き上げ運転の昼夜運転比率が異なる複数の沸き上げモードのうち一つを選択する沸き上げモード選択手段と、過去複数日分の給湯使用量を記憶する給湯使用量記憶手段と、前記過去複数日分の給湯使用量から沸き上げ必要湯量を算出すると共に、この沸き上げ必要湯量に所定の放熱ロス係数を乗じて沸き上げ目標湯量を算出する沸き上げ目標湯量算出手段と、前記沸き上げ目標湯量を前記選択された沸き上げモードに応じて夜間、または夜間および昼間に沸き上げるよう制御する沸き上げ制御手段と、を備え、前記沸き上げ目標湯量算出手段は、前記沸き上げモード選択手段で選択された沸き上げモードに応じて前記所定の放熱ロス係数を変更するようにした。   Therefore, in order to solve the above problems, the present invention provides a hot water storage tank for storing hot water, a heating means for boiling hot water in the hot water storage tank, a hot water supply pipe for supplying hot water in the hot water storage tank, and the hot water storage tank. Boiling mode selection means for selecting one of a plurality of boiling modes having different day / night operation ratios of boiling operation in which boiling water is boiled by the heating means, and hot water use for storing the amount of hot water used for a plurality of past days Calculate the required amount of boiling water from the amount storage means and the amount of hot water used for the past multiple days, and multiply the required amount of boiling water by a predetermined heat dissipation loss coefficient to calculate the boiling target hot water amount calculation And a boiling control means for controlling the boiling target hot water amount to be heated at night or at night and during the day according to the selected boiling mode, Boiling target hot water calculating means and adapted to change the predetermined heat radiation loss coefficient according to boiling the mode selected by said water heating mode selection means.

また、前記沸き上げ目標湯量算出手段は、昼間の運転比率が少ないあるいはない沸き上げモードでは、前記所定の放熱ロス係数を大きい値として沸き上げ目標湯量を多めにするものとした。   Further, the boiling target hot water amount calculation means is configured to increase the boiling target hot water amount by setting the predetermined heat dissipation loss coefficient to a large value in a boiling mode in which the daytime operation ratio is small or not.

本発明によれば、所定の放熱ロス係数を沸き上げモードに応じて変更することで、各沸き上げモードにおける湯余りや湯切れを防止することができると共に、貯湯式給湯装置の総合的な運転効率を向上させることができる。   According to the present invention, by changing the predetermined heat dissipation loss coefficient according to the heating mode, it is possible to prevent remaining hot water and running out of water in each heating mode, and to comprehensively operate the hot water storage type hot water supply device. Efficiency can be improved.

本発明の一実施形態の概略構成図Schematic configuration diagram of one embodiment of the present invention 同一実施形態の制御手段のブロック図Block diagram of control means of the same embodiment

次に、本発明の一実施形態のヒートポンプ式給湯装置を図面に基づいて説明する。
１は湯水を貯湯する貯湯タンク、２は貯湯タンク１下部へ給水する給水管、３は貯湯タンク１上部から出湯する出湯管、４は給水管２から分岐された給水バイパス管、５は出湯管３からの湯と給水バイパス管４からの水とを給湯設定温度に混合する給湯混合弁、６は給湯混合弁５で混合された湯水を給湯栓（図示せず）に供給する給湯管、７は給湯管６から流出する給湯の流量をカウントする給湯流量センサ、８は給湯管６から給湯される湯水の温度を検出する給湯温度センサである。 Next, a heat pump hot water supply apparatus according to an embodiment of the present invention will be described with reference to the drawings.
1 is a hot water storage tank for storing hot water, 2 is a water supply pipe for supplying water to the lower part of the hot water storage tank 1, 3 is a hot water discharge pipe for discharging hot water from the upper part of the hot water storage tank 1, 4 is a water supply bypass pipe branched from the water supply pipe 2, and 5 is a hot water discharge pipe A hot water mixing valve 6 for mixing hot water from 3 and water from the water supply bypass pipe 4 to a hot water set temperature; Is a hot water supply flow rate sensor for counting the flow rate of hot water flowing out of the hot water supply pipe 6, and 8 is a hot water supply temperature sensor for detecting the temperature of hot water supplied from the hot water supply pipe 6.

９は貯湯タンク１内の湯水を加熱する加熱手段としてのヒートポンプ式加熱手段で、冷媒を圧縮する圧縮機１０と、圧縮された高温冷媒と貯湯タンク１からの湯水とを熱交換する冷媒水熱交換器１１と、冷媒水熱交換器１１で放熱された冷媒を減圧する膨張弁１２と、低温低圧の冷媒を蒸発する蒸発器１３とを環状に接続して構成され、一定の加熱能力で作動するように制御されるもので、貯湯タンク１下部から取り出した湯を加熱して貯湯タンク１上部に戻すようにしているため沸き上げる湯量を自在にコントロールできるものである。   Reference numeral 9 denotes a heat pump heating means as a heating means for heating hot water in the hot water storage tank 1, and refrigerant water heat for exchanging heat between the compressor 10 for compressing the refrigerant and the compressed high-temperature refrigerant and the hot water from the hot water storage tank 1. An exchanger 11, an expansion valve 12 that depressurizes the refrigerant radiated by the refrigerant water heat exchanger 11, and an evaporator 13 that evaporates the low-temperature and low-pressure refrigerant are connected in a ring shape, and operate with a constant heating capacity. Since the hot water taken out from the lower part of the hot water storage tank 1 is heated and returned to the upper part of the hot water storage tank 1, the amount of hot water to be heated can be freely controlled.

１４は貯湯タンク１下部の湯水を冷媒水熱交換器１１へ循環させて貯湯タンク１上部に戻す加熱循環回路、１５は加熱循環回路１４途中に設けられた加熱循環ポンプ、１６は冷媒水熱交換器１１へ入水する湯水の温度を検出する入水温度センサ、１７は冷媒水熱交換器１１で加熱された湯水の温度を検出する沸き上げ温度センサである。   14 is a heating circulation circuit that circulates the hot water in the lower part of the hot water storage tank 1 to the refrigerant water heat exchanger 11 and returns it to the upper part of the hot water storage tank 1, 15 is a heating circulation pump provided in the middle of the heating circulation circuit 14, and 16 is refrigerant water heat exchange. An incoming water temperature sensor 17 for detecting the temperature of hot water entering the vessel 11, and a boiling temperature sensor 17 for detecting the temperature of the hot water heated by the refrigerant water heat exchanger 11.

１８は貯湯タンク１の外周側面上下に複数設けられ、貯湯タンク１内の湯水の温度を検出し、貯湯量を検出する貯湯温度センサで、ここでは、頂部貯湯温度センサ１８ａ、上部貯湯温度センサ１８ｂ、中間貯湯温度センサ１８ｃ、下部貯湯温度センサ１８ｄの４個の貯湯温度センサ１８が設けられており、下部貯湯温度センサ１８ｄは給湯があった際の最低温度を検出することで給水管２からの給水温度を検出する給水温度検出手段を兼ねているものである。   Reference numeral 18 denotes a hot water storage temperature sensor which is provided in plural above and below the outer peripheral side surface of the hot water storage tank 1 and detects the temperature of hot water in the hot water storage tank 1 to detect the amount of hot water storage. Here, the top hot water storage temperature sensor 18a and the upper hot water storage temperature sensor 18b. There are four hot water storage temperature sensors 18, an intermediate hot water storage temperature sensor 18 c and a lower hot water storage temperature sensor 18 d, and the lower hot water storage temperature sensor 18 d detects the lowest temperature when hot water is supplied, thereby It also serves as a feed water temperature detecting means for detecting the feed water temperature.

１９はリモコンで、給湯装置に関する各種の情報（給湯設定温度、残湯量、給湯装置の作動状態、沸き上げモード等）を表示する表示部２０と、給湯設定温度を設定操作するための増減設定スイッチ２１と、複数の沸き上げモードからいずれか一つの沸き上げモードを選択設定する沸き上げモード設定スイッチ２２を備えている。   Reference numeral 19 denotes a remote controller, which is a display unit 20 for displaying various information related to the hot water supply device (hot water set temperature, amount of remaining hot water, operating state of the hot water supply device, boiling mode, etc.), and an increase / decrease setting switch for setting the hot water supply set temperature. 21 and a boiling mode setting switch 22 for selectively setting any one of the plurality of boiling modes.

２３は給湯流量センサ７、給湯温度センサ８、入水温度センサ１６、沸き上げ温度センサ１７、貯湯温度センサ１８の検出値が入力され、給湯混合弁５、圧縮機１０、膨張弁１２、加熱循環ポンプ１５の作動を制御すると共に、リモコン１９と通信可能に接続された制御手段である。この制御手段２３は、予め給湯装置の作動を制御するためのプログラムが記憶されていると共に、演算、比較、記憶機能、時計機能を有しているものである。   Reference numeral 23 denotes a hot water supply flow rate sensor 7, a hot water supply temperature sensor 8, an incoming water temperature sensor 16, a boiling temperature sensor 17, and a hot water storage temperature sensor 18, and the hot water mixing valve 5, the compressor 10, the expansion valve 12, and the heating circulation pump. The control means is connected to the remote controller 19 so as to be communicable with each other. The control means 23 stores a program for controlling the operation of the hot water supply device in advance, and has a calculation, comparison, storage function, and clock function.

２４は沸き上げ運転の昼夜運転比率が異なる複数の沸き上げモードのうち一つをリモコン１９の沸き上げモード設定スイッチ２２の操作に応じて選択設定する沸き上げモード選択手段で、複数の沸き上げモードとして、ここでは昼間の運転比率がなく電力料金単価の廉価な深夜時間帯にのみ沸き上げ運転を行う深夜のみモード、昼間の運転比率があり深夜時間帯に沸き上げきられなかった分を昼間時間帯に沸き上げる標準モード、昼間の運転比率が標準モードより高く、より積極的に昼間時間帯の沸き上げ運転を行う多めモード、が予め用意されている。   Reference numeral 24 denotes a heating mode selection means for selecting and setting one of a plurality of boiling modes having different day / night operation ratios of the boiling operation according to the operation of the heating mode setting switch 22 of the remote controller 19. In this case, there is no daytime operation ratio, and only the midnight mode is used for heating operation only during the low-night time zone where the unit price of electricity is low, and the daytime hour is the daytime operation ratio that cannot be heated during the midnight time zone. A standard mode for boiling up in the belt and a higher mode in which the daytime operation ratio is higher than that in the standard mode and the heating operation in the daytime time zone is more positive are prepared in advance.

２５は過去複数日分の給湯使用量を記憶する給湯使用量記憶手段で、ここでは、給湯流量センサ７で検出した給湯流量と、記憶されていた給水温度と、リモコン１９で設定された給湯設定温度とから１日の給湯に供された給湯使用量を一定温度（ここでは４３℃）での給湯使用量に換算し、過去複数日分記憶するものである。   Reference numeral 25 denotes hot water supply amount storage means for storing hot water supply use amounts for the past plural days. Here, the hot water supply flow rate detected by the hot water supply flow rate sensor 7, the stored hot water temperature, and the hot water supply setting set by the remote controller 19. The amount of hot water used for one day of hot water supply is converted from the temperature into the amount of hot water used at a constant temperature (43 ° C. in this case) and stored for a plurality of past days.

２６は給湯使用量記憶手段２５で記憶している過去複数日分の一定温度換算の給湯使用量から翌日に必要な沸き上げ必要湯量を算出すると共に、沸き上げ必要湯量に所定の放熱ロス係数を乗じて沸き上げ目標湯量を算出する沸き上げ目標湯量算出手段で、ここでは過去複数日分の平均給湯使用量と給湯使用量のバラツキを算出し、平均給湯使用量に所定の定数を乗じたバラツキを加算して沸き上げ必要湯量を算出し、さらに所定の放熱ロス係数を沸き上げ必要湯量に乗じて沸き上げ目標湯量を算出するようにしている。   26 calculates the required amount of boiling water required for the next day from the constant temperature conversion amount of hot water used for the past several days stored in the hot water usage amount storage means 25, and sets a predetermined heat dissipation loss coefficient to the required amount of boiling water. This is a means for calculating the target hot water volume for boiling, which calculates the target hot water volume for boiling.In this case, the average hot water usage and the variation in hot water usage over the past several days are calculated, and the average hot water usage is multiplied by a predetermined constant. Is added to calculate the amount of hot water required for boiling, and the target amount of hot water to be heated is calculated by multiplying the required amount of hot water for heating with a predetermined heat dissipation loss coefficient.

ここで、沸き上げ目標湯量算出手段２６は、所定の放熱ロス係数を複数の沸き上げモード毎に記憶しているもので、沸き上げモードが標準モードでは所定の放熱ロス係数を標準値、沸き上げモードが昼間運転比率がない深夜のみモードでは所定の放熱ロス係数を標準値よりも大きい値、沸き上げモードが昼間運転比率が標準モードより高い多めモードでは所定の放熱ロス係数を標準値より小さい値として記憶しており、沸き上げモード選択手段２４で選択された沸き上げモードに応じた所定の放熱ロス係数を用いて沸き上げ目標湯量を算出するようにしている。   Here, the boiling target hot water amount calculating means 26 stores a predetermined heat dissipation loss coefficient for each of a plurality of boiling modes, and when the heating mode is the standard mode, the predetermined heat dissipation loss coefficient is a standard value and the boiling is increased. When the mode has no daytime operation ratio, the predetermined heat dissipation loss coefficient is larger than the standard value in the midnight only mode, and when the heating mode is higher than the standard mode in the boiling mode, the predetermined heat dissipation loss coefficient is smaller than the standard value. And the boiling target hot water amount is calculated using a predetermined heat dissipation loss coefficient corresponding to the boiling mode selected by the boiling mode selection means 24.

２７は過去の給湯使用量あるいは給水温度または外気温度等の給湯負荷から沸き上げ目標温度を決定する沸き上げ目標温度決定手段、２８は貯湯温度センサ１８ａ〜ｄの検出値と、予め貯湯温度センサ１８ａ〜ｄ毎に割り当てられた貯湯容量とから貯湯タンク１内の貯湯熱量および沸き上げ不要な所定温度以上の貯湯量を検出する貯湯量検出手段である。   Reference numeral 27 denotes a boiling target temperature determining means for determining a boiling target temperature from a past hot water supply usage amount or a hot water supply load such as a supply water temperature or an outside air temperature. It is a hot water storage amount detecting means for detecting the amount of hot water stored in the hot water storage tank 1 and the amount of hot water stored at a predetermined temperature or higher that does not require boiling from the hot water storage capacity assigned for each of the .about.d.

２９は深夜時間帯に沸き上げ運転を開始する沸き上げ開始時刻を算出するピークシフト時刻算出手段で、貯湯タンク１の容量から貯湯量検出手段２８で検出する深夜時間帯の開始時刻の貯湯量を減算した沸き上げ量をヒートポンプ式加熱手段９の一定の加熱能力で除して沸き上げ必要時間を算出し、深夜時間帯の終了時刻（昼間時間帯の開始時刻）から逆算して沸き上げ開始時刻を算出するものである。   29 is a peak shift time calculating means for calculating the boiling start time for starting the boiling operation in the midnight time zone. The hot water storage amount at the start time of the midnight time zone detected by the hot water storage amount detecting means 28 from the capacity of the hot water storage tank 1 is indicated. The required boiling time is calculated by dividing the subtracted boiling amount by the constant heating capacity of the heat pump heating means 9, and the boiling start time is calculated backward from the end time of the midnight time zone (daytime start time) Is calculated.

３０は昼間の沸き上げ運転が必要な量を算出する昼間沸き上げ量算出手段で、沸き上げ目標湯量を熱量換算した量から深夜時間帯の終了時刻（昼間時間帯の開始時刻）に貯湯量検出手段２８で検出する貯湯熱量を減算して、昼間沸き上げ量を算出しており、沸き上げモードが昼間の沸き上げ運転を行わないモードであった場合は、昼間沸き上げ量をゼロとしている。   Numeral 30 is a daytime boiling amount calculation means for calculating the amount required for daytime boiling operation. The amount of stored hot water is detected at the end time of the midnight time zone (daytime start time) from the amount of heating target hot water amount converted to heat. The daytime boiling amount is calculated by subtracting the amount of stored hot water detected by the means 28. If the boiling mode is a mode in which no daytime heating operation is performed, the daytime boiling amount is set to zero.

３１は沸き上げ目標湯量を選択された沸き上げモードに応じて深夜時間帯、または深夜時間帯と昼間時間帯に沸き上げ目標温度まで沸き上げるようヒートポンプ式加熱手段９を制御する沸き上げ制御手段で、沸き上げ開始時刻となるとヒートポンプ式加熱手段９と加熱循環ポンプ１５を駆動制御して沸き上げ運転を開始し、沸き上げ目標湯量を沸き上げるか、深夜時間帯の終了時刻となると沸き上げ終わっていなくともヒートポンプ式加熱手段９と加熱循環ポンプ１５を駆動停止して沸き上げ運転を停止すると共に、昼間沸き上げ量がある場合は、給湯が行われた後に貯湯タンク１内が沸き上げ可能な量の水があることを検出すると所定のタイミングで昼間の沸き上げ運転を開始し、昼間沸き上げ量を沸き上げると昼間の沸き上げ運転を停止するものである。   31 is a boiling control means for controlling the heat pump heating means 9 so that the boiling target hot water is heated up to the boiling target temperature in the late-night time zone or in the late-night time zone and daytime time zone according to the selected boiling mode. When the boiling start time is reached, the heating pump heating means 9 and the heating circulation pump 15 are driven and controlled to start the boiling operation, and the boiling target hot water amount is heated or the boiling is finished when the end time of the midnight time zone is reached. At least the heat pump type heating means 9 and the heating circulation pump 15 are stopped to stop the boiling operation, and when there is a daytime boiling amount, the amount that can be heated in the hot water storage tank 1 after hot water is supplied When it is detected that there is water in the daytime, the daytime boiling operation is started at a predetermined timing, and when the daytime boiling amount is boiled, the daytime boiling operation is stopped. Is shall.

このように、所定の放熱ロス係数を沸き上げ運転の昼夜運転比率の異なる沸き上げモード毎に変更するようにしたので、沸き上げ運転の昼間運転比率が高く、沸き上げ運転による貯湯動作と給湯による消費動作とが時間的に近接するため放熱ロスが少ない沸き上げモードでは、所定の放熱ロス係数を小さい値とすることで沸き上げる湯量を少なめにして湯余りを防止することができ、沸き上げ運転の昼間運転比率が低いまたはないため、沸き上げ運転による貯湯動作と給湯による消費動作とが時間的に離れているため放熱ロスが多い沸き上げモードでは、所定の放熱ロス係数を大きい値とすることで沸き上げる湯量を多めにして湯切れを防止することができ、貯湯式給湯装置の総合的な運転効率を向上させることができるものである。   In this way, the predetermined heat dissipation loss coefficient is changed for each heating mode with different daytime / nighttime operation ratios for boiling operation, so the daytime operation ratio for boiling operation is high, and the hot water storage operation and hot water supply by boiling operation In the boiling mode with little heat loss due to close proximity to the consumption operation, the amount of hot water to be heated can be reduced by setting the specified heat loss coefficient to a small value to prevent excess hot water. Since the daytime operation ratio is low or absent, the hot water storage operation by boiling operation and the consumption operation by hot water supply are separated in time, so in the heating mode with a large heat dissipation loss, the specified heat dissipation loss coefficient should be a large value Therefore, it is possible to prevent the hot water from running out by increasing the amount of hot water to be boiled, and to improve the overall operation efficiency of the hot water storage type hot water supply apparatus.

なお、本発明は上記一実施形態に限定されるものではなく、加熱手段として電気ヒータを用いてもよく、給湯使用量、沸き上げ必要湯量、沸き上げ目標湯量を所定温度の湯量として計算に用いているが、熱量換算して計算に用いてもよい。   The present invention is not limited to the above-described embodiment, and an electric heater may be used as the heating means. The amount of hot water used, the amount of hot water required for boiling, and the amount of hot water to be heated are used for calculation as the amount of hot water at a predetermined temperature. However, it may be used for calculation in terms of calorific value.

１ 貯湯タンク
６ 給湯管
９ ヒートポンプ式加熱手段
２４ 沸き上げモード選択手段
２５ 給湯使用量記憶手段
２６ 沸き上げ目標湯量算出手段
３１ 沸き上げ制御手段 DESCRIPTION OF SYMBOLS 1 Hot water storage tank 6 Hot-water supply pipe 9 Heat pump type heating means 24 Boiling mode selection means 25 Hot-water supply usage storage means 26 Boiling target hot water amount calculation means 31 Boiling control means

Claims (2)

湯水を貯湯する貯湯タンクと、前記貯湯タンク内の湯水を沸き上げる加熱手段と、前記貯湯タンク内の湯水を給湯する給湯管と、前記貯湯タンク内の湯水を前記加熱手段で沸き上げる沸き上げ運転の昼夜運転比率が異なる複数の沸き上げモードのうち一つを選択する沸き上げモード選択手段と、過去複数日分の給湯使用量を記憶する給湯使用量記憶手段と、前記過去複数日分の給湯使用量から沸き上げ必要湯量を算出すると共に、この沸き上げ必要湯量に所定の放熱ロス係数を乗じて沸き上げ目標湯量を算出する沸き上げ目標湯量算出手段と、前記沸き上げ目標湯量を前記選択された沸き上げモードに応じて夜間、または夜間および昼間に沸き上げるよう制御する沸き上げ制御手段と、を備え、前記沸き上げ目標湯量算出手段は、前記沸き上げモード選択手段で選択された沸き上げモードに応じて前記所定の放熱ロス係数を変更するようにしたことを特徴とする貯湯式給湯装置。   A hot water storage tank for storing hot water, a heating means for boiling hot water in the hot water storage tank, a hot water supply pipe for supplying hot water in the hot water storage tank, and a boiling operation for boiling hot water in the hot water storage tank with the heating means A heating mode selection means for selecting one of a plurality of boiling modes having different day / night operation ratios, a hot water usage storage means for storing hot water usage for the past plural days, and hot water for the past plural days A heating target hot water amount calculation means for calculating a boiling target hot water amount from a use amount and calculating a boiling target hot water amount by multiplying the boiling hot water amount by a predetermined heat dissipation loss coefficient, and the boiling target hot water amount is selected. A boiling control means for controlling to boil at night or at night and during the day according to the boiling mode, and the boiling target hot water calculating means Hot water storage type water heater, wherein in response to the boiling mode is selected by the mode selection means that you have to change the predetermined heat radiation loss coefficient. 前記沸き上げ目標湯量算出手段は、昼間の運転比率が少ないあるいはない沸き上げモードでは、前記所定の放熱ロス係数を大きい値として沸き上げ目標湯量を多めにすることを特徴とする請求項１記載の貯湯式給湯装置。   2. The boiling target hot water amount calculating means increases the boiling target hot water amount by setting the predetermined heat dissipation loss coefficient to a large value in a boiling mode in which the daytime operation ratio is small or not. Hot water storage water heater.
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