JP2004232911A

JP2004232911A - Water heater

Info

Publication number: JP2004232911A
Application number: JP2003020017A
Authority: JP
Inventors: Masahiro Ohama; 昌宏尾浜; Takeji Watanabe; 竹司渡辺; Yoshitsugu Nishiyama; 吉継西山; Seiichi Yasuki; 誠一安木; Keijiro Kunimoto; 啓次郎國本; Koji Oka; 浩二岡; Tetsuei Kuramoto; 哲英倉本
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2003-01-29
Filing date: 2003-01-29
Publication date: 2004-08-19
Anticipated expiration: 2023-01-29
Also published as: JP3744495B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water heater allowing an increase in hot water supply performance in heating in a hot water storage type multi-functional water heater. <P>SOLUTION: This water heater comprises a heating means 11, a hot water storage tank 4 storing hot water heated by the heating means 11, a radiating means 17 using hot water in the hot water storage tank 4 as a heat source, and a control means 28 controlled so that a heated amount by the heating means 11 is larger than a radiating amount by the radiating means 17. Since the water heater is controlled so that the heated amount by the heating means 11 can be increased larger than the radiating amount by the radiating means 17, the possibility of shortage of hot water can be reduced even if heating is continuously performed for a long time. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は貯湯式の給湯機に関するものである。
【０００２】
【従来の技術】
従来、この種の貯湯式の給湯機は特許文献１に示すものがある。以下、その構成について図４を参照しながら説明する。図４に示すように、加熱手段としてのヒートポンプユニットは、圧縮機１、給湯用冷媒対水熱交換器２、大気熱交換器３などが順次接続されて構成される。そして、貯湯槽４から循環ポンプ５で送られてきた水は前記給湯用冷媒対水熱交換器２で冷媒熱により加熱されて貯湯槽４の上から貯湯される（給湯加熱運転）。さらに、放熱手段側循環ポンプ６によって送られてきた浴槽７の湯と、貯湯側循環ポンプ８によって送られてきた貯湯槽４の上部の湯とが、放熱手段用熱交換器９で熱交換して風呂追い焚きするものである。ところで、この図４の場合は風呂追い焚きをする場合であるが、貯湯槽４の温水を熱源として暖房（例えば床暖房）を行う場合には、図５に示すような構成が考えられる。つまり、図４の浴槽７の代わりに暖房手段１０を接続した構成である。
【０００３】
【特許文献１】
特開２００２−２４３２７４号公報
【０００４】
【発明が解決しようとする課題】
給湯負荷はある程度予測できるので貯湯式の給湯機でも湯切れすることは少なし、逆に、予測される給湯負荷（家族の人数など）に対して、給湯能力が満足するように貯湯槽の大きさを選択して設置することが一般的である。一方、暖房負荷はその予測が難しい。一日のうち何時間使用されるかわからないが、機器としては最大の暖房負荷に対しても満足する必要がある。しかしながら、上記のような構成では、例えば、朝早くから暖房が続いたときで、最大の給湯負荷である浴槽７への湯張りがあると貯湯槽４に貯湯された熱量が不足して、湯切れする場合がある。これを防ぐために、浴槽７への湯張りが開始されてから、上記給湯加熱運転を行っても給湯負荷に対して、給湯加熱能力が追いつかず、結局湯切れを起こす場合があるという課題を有している。湯切れを起こさない方法として、貯湯槽４の大きさを最大暖房負荷に合わせて大きくしても良いが、貯湯槽４の大きさがあまりにも大きくなりすぎ、広い設置スペースが必要であったり、機器コストが高くなるという課題を有している。
【０００５】
本発明は上記課題を解決するもので、長時間の暖房が続いた場合でも湯切れが少ない給湯機を提供することを目的とする。
【０００６】
【課題を解決するための手段】
前記従来の課題を解決するために、本発明の多機能給湯機は、加熱手段と、前記加熱手段で加熱した温水を貯湯する貯湯槽と、前記貯湯槽の温水を熱源とする放熱手段と、放熱手段における放熱量よりも加熱手段における加熱量を大きくなるように制御する制御手段とを具備したものである。
【０００７】
これによって、放熱手段からの放熱が長く続いた場合（例えば長時間の暖房が続いた場合）でも湯切れの起こることを少なくすることができる。
【０００８】
【発明の実施の形態】
本発明は各請求項に記載の形態で実施できるものであり、請求項１記載の発明は、加熱手段と、前記加熱手段で加熱した温水を貯湯する貯湯槽と、前記貯湯槽の温水を熱源とする放熱手段と、放熱手段における放熱量よりも加熱手段における加熱量を大きくなるように制御するため、長時間の暖房が続いた場合でも湯切れの起こることを少なくすることができる。
【０００９】
請求項２記載の発明は、加熱量を検出する加熱能力検出手段として、加熱手段の入口と出口の水温を検出する加熱用入口水温検出手段および加熱用出口水温検出手段と、前記加熱手段を流れる水の流量を検出する加熱用流量検出手段とを具備しているため、加熱量を正確に把握することができ、長時間の暖房が続いた場合でも湯切れの起こることを少なくすることができる。
【００１０】
請求項３記載の発明は、放熱量を検出する放熱能力検出手段として、貯湯槽の温水と放熱手段の熱媒体とが熱交換する熱交換器の熱源側入口と出口に設けた熱源側入口水温検出手段と熱源側出口水温検出手段と、前記熱交換器の熱源側水回路を循環する温水の循環量を検出する熱源側流量検出手段とを具備しているため、放熱量を正確に把握することができ、長時間の暖房が続いた場合でも湯切れの起こることを少なくすることができる。
【００１１】
請求項４記載の発明は、放熱量を検出する放熱能力検出手段として、貯湯槽の温水と放熱手段の熱媒体とが熱交換する熱交換器の利用側入口と出口に設けた利用側入口温度検出手段と利用側出口温度検出手段と、前記熱交換器の利用側回路を循環する熱媒体の循環量を検出する利用側流量検出手段とを具備しているため、放熱量を正確に把握することができ、長時間の暖房が続いた場合でも湯切れの起こることを少なくすることができる。
【００１２】
請求項５記載の発明は、前述の構成に加え、加熱手段をヒートポンプとすることによって、高能力省エネルギー化をはかる。
【００１３】
請求項６記載の発明は、圧縮機の能力を制御することによって加熱量の制御を行うため、暖房負荷に対して加熱量を制御するので、長時間の暖房が続いた場合でも湯切れの起こることを少なくすることができる。
【００１４】
【実施例】
以下、本発明の実施例について図面を用いて説明する。図１は本発明の多機能給湯機の構成図、図２は同多機能給湯機の第１の他の実施例における構成図、図３は同多機能給湯機の第２の他の実施例の構成図である。
【００１５】
図１において、１１は加熱手段であり、圧縮機１、放熱器１２、減圧装置１３、大気熱を吸熱する大気熱交換器３からなるヒートポンプサイクルを構成したヒートポンプ熱源である。そして、高圧側の冷媒圧力が臨界圧力以上となる二酸化炭素を冷媒とする。４は貯湯槽であり、下部から給水管４ａを通って給水し、上部の出湯管４ｂから端末へ出湯する。５は循環ポンプ、１４は給湯熱交換器であり、放熱器１２と熱交換関係を有して、放熱器１２を流れる冷媒と給湯熱交換器１４を流れる水を対向流で熱交換する構成である。そして、貯湯槽４の下部から循環ポンプ５，給湯熱交換器１４，貯湯槽４の上部を順次接続する給湯回路を構成する。１５は加熱用出口水温検出手段であり、ヒートポンプ熱源で加熱する湯温を検出するため給湯熱交換器１４の出口に設けられている。１６は湯水制御手段であり、給湯熱交換器１４の出口湯水が所定温度にとなるように循環ポンプ５の回転数を制御して給湯回路の循環流量を制御する。１７は放熱手段となる、例えば床暖房機であり、貯湯槽４の上部の温水が循環して暖房する。つまり、放熱用ポンプ１８によって送られてきた放熱手段１７の熱媒体と、貯湯水ポンプ１９によって送られてきた貯湯槽４の上部の湯とが、熱交換器２０で熱交換して暖房するものである。つまり、本発明の構成は、給湯機能と暖房機能（例えば床暖房）を備えた多機能の給湯機である。
【００１６】
また、本実施例では加熱量を検出する加熱能力検出手段２１として、給湯熱交換器１４の入口と出口に設けた加熱用入口水温検出手段２２と加熱用出口水温検出手段１５と給湯熱交換器１４を循環する水の循環量を検出する加熱用流量検出手段２３とを備えている。また、放熱量を検出する放熱能力検出手段２４として、貯湯槽４の温水と放熱手段１７の熱媒体とが熱交換する熱交換器２０の熱源側入口と出口に設けた熱源側入口水温検出手段２５と熱源側出口水温検出手段２６と熱交換器２０の熱源側を循環する温水の循環量を検出する熱源側流量検出手段２７とを備えている。さらに制御手段２８は周波数制御手段２９によって、圧縮機１の回転数を所定回転数に設定することによって能力を制御する。
【００１７】
以上のように構成された多機能給湯機について、以下にその動作、作用を説明する。図１において、ヒートポンプ熱源で大気熱を利用して給湯運転する場合について説明する。圧縮機１から吐出する臨界圧力以上の高温高圧の冷媒が放熱器１２に流入し、ここで貯湯槽４の下部から送られてきた水と給湯熱交換器１４を介して熱交換する。そして、放熱器１２に流入する高温冷媒で給湯熱交換器１４の出口湯水が所定温度となるように循環ポンプ５の回転数を制御し、所定の温度の湯が貯湯槽４の上部から流入し貯湯される。
【００１８】
次に、放熱手段１７を使用する場合（例えば床暖房）について説明する。放熱手段１７で放熱し中低温になり放熱用ポンプ１８によって送られてきた熱媒体は、貯湯水ポンプ１９によって送られてきた貯湯槽４の上部の高温の湯と、熱交換器２０で熱交換して放熱手段１７に戻る。一方、貯湯水ポンプ１９によって送られてきた貯湯槽４の上部の高温の湯は中温となって貯湯槽４に戻る。なお、放熱手段１７を循環する熱媒体としては不凍液や水がある。
【００１９】
放熱手段１７を使用中に貯湯槽４の保有熱量が少なくなったときには上記給湯運転を行う。この場合、制御手段２８は放熱能力検出手段２４である熱源側入口水温検出手段２５と熱源側出口水温検出手段２６から得た温度差と熱源側流量検出手段２７から得た水の循環量から放熱量を計算する。さらに、制御手段２８は加熱能力検出手段２１である加熱用入口水温検出手段２２と加熱用出口水温検出手段１５から得た温度差と加熱用流量検出手段２３から得た水の循環量から加熱量を計算する。そして、計算で求めた前記放熱量よりも前記加熱量が小さければ制御手段２８は周波数制御手段２９に対して、圧縮機１の能力が大きくなるように制御する。
【００２０】
上記のように、放熱手段１７における放熱量よりも加熱手段１１における加熱量を大きくなるように制御するため、長時間の暖房が続いた場合でも湯切れの起こることを少なくすることができる。
【００２１】
また、本実施例では、放熱量を検出する放熱能力検出手段２４として、貯湯槽４の温水と放熱手段１７の熱媒体とが熱交換する熱交換器２０の熱源側入口と出口に設けた熱源側入口水温検出手段２５と熱源側出口水温検出手段２６と熱交換器２０の熱源側を循環する温水の循環量を検出する熱源側流量検出手段２７とから構成しているが、図２に示すように、放熱量を検出する放熱能力検出手段２４として、貯湯槽４の温水と放熱手段１７の熱媒体とが熱交換する熱交換器２０の利用側入口と出口に設けた利用側入口温度検出手段３０と利用側出口温度検出手段３１と熱交換器２０の利用側を循環する熱媒体の循環量を検出する利用側流量検出手段３２とから構成して、利用側入口温度検出手段３０と利用側出口温度検出手段３１から得た温度差と利用側流量検出手段３２から得た熱媒体の循環量から放熱量を計算しても、前述と同様の作用、効果が得られる。
【００２２】
さらに、前述の図１および図２のように、直接加熱能力検出手段２１や放熱能力検出手段２４で加熱量と放熱量を求めなくても、運転状態に対する加熱量や放熱量を予め求めておいて、加熱能力記憶手段３３と放熱能力記憶手段３４に記憶させておけば、間接的な運転状態から加熱量や放熱量が推定できる。例えば、図３に示すように、外気温度を検出する外気温度検出手段３５と加熱用入口水温検出手段２２と加熱用出口水温検出手段１５と圧縮機１の回転数とから加熱量が推定できるので、この関係を加熱能力記憶手段３３に記憶させる。また、熱源側入口水温検出手段２５と利用側入口温度検出手段３０と貯湯水ポンプ１９の出力などから放熱量が推定できるので、この関係を放熱能力記憶手段３４に記憶させる。そして、放熱手段１７を使用中に貯湯槽４の保有熱量が少なくなったときの給湯運転を行う場合に、加熱能力記憶手段３３と放熱能力記憶手段３４とから求めた加熱量と放熱量を用いても、前述と同様の作用、効果が得られる。
【００２３】
また、本実施例では放熱手段１７を床暖房に使用する場合について説明したが、放熱手段を風呂追い焚きに使用しても良い。この場合、長時間の風呂追い焚きが続いた場合でも湯切れが起こることがないという効果がある。
【００２４】
【発明の効果】
以上のように、本発明によれば、放熱手段における放熱量よりも加熱手段における加熱量を大きくなるように制御するため、放熱手段からの放熱が長く続いた場合（例えば長時間の暖房が続いた場合）でも湯切れの起こることを少なくすることができる。
【図面の簡単な説明】
【図１】本発明の多機能給湯機の構成図
【図２】同、多機能給湯機における第１の他の実施例を示す構成図
【図３】同、多機能給湯機における第２の他の実施例を示す構成図
【図４】従来例における多機能給湯機の構成図
【図５】従来例における第２の多機能給湯機の構成図
【符号の説明】
４貯湯槽
１１加熱手段
１７放熱手段
２８制御手段[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hot water supply type hot water supply apparatus.
[0002]
[Prior art]
Conventionally, this type of hot water storage type hot water heater is disclosed in Patent Document 1. Hereinafter, the configuration will be described with reference to FIG. As shown in FIG. 4, the heat pump unit as a heating means is configured by sequentially connecting a compressor 1, a hot water supply refrigerant-water heat exchanger 2, an atmospheric heat exchanger 3, and the like. The water sent from the hot water storage tank 4 by the circulation pump 5 is heated by the refrigerant heat in the hot water supply refrigerant-to-water heat exchanger 2 and stored in the hot water storage tank 4 (hot water supply heating operation). Further, the hot water in the bath tub 7 sent by the heat radiating means side circulation pump 6 and the hot water in the upper part of the hot water storage tank 4 sent by the hot water storage side circulation pump 8 exchange heat in the heat exchanger 9 for heat radiating means. It is a thing to heat a bath. By the way, the case of FIG. 4 is a case where a bath is reheated, and a configuration as shown in FIG. 5 is conceivable in a case where heating (for example, floor heating) is performed using hot water in the hot water storage tank 4 as a heat source. That is, the heating unit 10 is connected in place of the bathtub 7 in FIG.
[0003]
[Patent Document 1]
JP-A-2002-243274
[Problems to be solved by the invention]
The hot water supply load can be predicted to some extent, so it is unlikely that the hot water supply will run out even with a hot water supply type water heater. Conversely, the size of the hot water storage tank will be large enough to satisfy the predicted hot water supply load (such as the number of family members). It is common to select and install. On the other hand, the heating load is difficult to predict. I don't know how many hours a day it will be used, but the equipment needs to meet the maximum heating load. However, in the above-described configuration, for example, when heating is continued from early in the morning, if there is hot water in the bathtub 7 which is the maximum hot water supply load, the amount of heat stored in the hot water storage tank 4 becomes insufficient, and the hot water runs out. May be. In order to prevent this, there is a problem that even if the hot water supply heating operation is performed after the hot water supply to the bathtub 7 is started, the hot water supply heating capacity cannot catch up with the hot water supply load, and the hot water may eventually run out. are doing. As a method of preventing running out of hot water, the size of the hot water storage tank 4 may be increased according to the maximum heating load, but the size of the hot water storage tank 4 becomes too large, and a large installation space is required. There is a problem that the equipment cost increases.
[0005]
An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a water heater in which hot water runs out even when heating is continued for a long time.
[0006]
[Means for Solving the Problems]
In order to solve the conventional problems, the multifunctional water heater of the present invention includes a heating unit, a hot water storage tank that stores hot water heated by the heating unit, and a heat radiation unit that uses hot water in the hot water storage tank as a heat source. Control means for controlling the amount of heat in the heating means to be larger than the amount of heat radiation in the heat radiating means.
[0007]
Thereby, even when the heat radiation from the heat radiating means continues for a long time (for example, when heating for a long time continues), it is possible to reduce the possibility of running out of hot water.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention can be embodied in the form described in each claim, and the invention described in claim 1 is a heating means, a hot water storage tank for storing hot water heated by the heating means, and a heat source for storing hot water in the hot water storage tank. And the amount of heat in the heating means is controlled to be larger than the amount of heat radiated by the heat radiating means, so that running out of hot water can be reduced even when heating is continued for a long time.
[0009]
According to a second aspect of the present invention, as the heating capacity detecting means for detecting the heating amount, the heating inlet water temperature detecting means and the heating outlet water temperature detecting means for detecting the inlet and outlet water temperatures of the heating means, and the heating means flow through the heating means. Since the apparatus is provided with the heating flow rate detecting means for detecting the flow rate of water, it is possible to accurately grasp the heating amount, and it is possible to reduce the possibility of running out of hot water even when heating is continued for a long time. .
[0010]
According to a third aspect of the present invention, a heat source side inlet water temperature provided at a heat source side inlet and an outlet of a heat exchanger for exchanging heat between hot water in a hot water tank and a heat medium of the heat radiating means as a heat radiation capability detecting means for detecting a heat radiation amount. Since it is provided with the detecting means, the heat source side outlet water temperature detecting means, and the heat source side flow detecting means for detecting the circulation amount of the hot water circulating in the heat source side water circuit of the heat exchanger, the heat radiation amount can be accurately grasped. It is possible to reduce running out of hot water even when heating is continued for a long time.
[0011]
According to a fourth aspect of the present invention, as a heat radiation capability detecting means for detecting a heat radiation amount, a use side entrance temperature provided at a use side entrance and an exit side of a heat exchanger for exchanging heat between hot water in a hot water tank and a heat medium of the heat radiation means. Since it is provided with the detecting means, the use side outlet temperature detecting means, and the use side flow rate detecting means for detecting the circulating amount of the heat medium circulating in the use side circuit of the heat exchanger, the heat radiation amount can be accurately grasped. It is possible to reduce running out of hot water even when heating is continued for a long time.
[0012]
The invention according to claim 5 achieves high-capacity energy saving by using a heat pump as the heating means in addition to the above configuration.
[0013]
In the invention according to claim 6, since the amount of heating is controlled by controlling the capacity of the compressor, the amount of heating is controlled with respect to the heating load. Can be reduced.
[0014]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a multi-function water heater of the present invention, FIG. 2 is a configuration diagram of a first other embodiment of the multi-function water heater, and FIG. 3 is a second other embodiment of the multi-function water heater. FIG.
[0015]
In FIG. 1, reference numeral 11 denotes a heating means, which is a heat pump heat source constituting a heat pump cycle including a compressor 1, a radiator 12, a pressure reducing device 13, and an atmospheric heat exchanger 3 for absorbing atmospheric heat. Then, carbon dioxide whose refrigerant pressure on the high pressure side is equal to or higher than the critical pressure is used as the refrigerant. Reference numeral 4 denotes a hot water storage tank, which supplies water from a lower part through a water supply pipe 4a, and taps water from an upper part of the hot water supply pipe 4b to a terminal. Reference numeral 5 denotes a circulation pump, and reference numeral 14 denotes a hot water supply heat exchanger, which has a heat exchange relationship with the radiator 12 and exchanges heat between the refrigerant flowing through the radiator 12 and the water flowing through the hot water supply heat exchanger 14 in a counterflow manner. is there. And the hot water supply circuit which connects the circulation pump 5, the hot water supply heat exchanger 14, and the upper part of the hot water storage tank 4 sequentially from the lower part of the hot water storage tank 4 is comprised. Reference numeral 15 denotes a heating outlet water temperature detecting means, which is provided at the outlet of the hot water supply heat exchanger 14 for detecting the temperature of the hot water to be heated by the heat pump heat source. Reference numeral 16 denotes hot water control means, which controls the number of revolutions of the circulation pump 5 so that the hot water at the outlet of the hot water supply heat exchanger 14 has a predetermined temperature to control the circulation flow rate of the hot water supply circuit. Reference numeral 17 denotes a floor heater, for example, which serves as a heat radiating unit, and circulates and heats hot water above the hot water storage tank 4. That is, the heat medium of the heat radiating means 17 sent by the heat radiating pump 18 and the hot water in the upper part of the hot water storage tank 4 sent by the hot water storage pump 19 exchange heat with the heat exchanger 20 for heating. It is. That is, the configuration of the present invention is a multifunctional water heater having a hot water supply function and a heating function (for example, floor heating).
[0016]
Further, in this embodiment, as the heating capacity detecting means 21 for detecting the amount of heating, a heating inlet water temperature detecting means 22, a heating outlet water temperature detecting means 15 provided at an inlet and an outlet of the hot water supply heat exchanger 14, and a hot water supply heat exchanger. And a heating flow rate detecting means 23 for detecting a circulating amount of water circulating in the heating apparatus 14. Further, as a heat radiation ability detecting means 24 for detecting a heat radiation amount, a heat source side inlet water temperature detecting means provided at a heat source side inlet and an outlet of a heat exchanger 20 in which hot water in the hot water storage tank 4 and a heat medium of the heat radiating means 17 exchange heat. 25, a heat source side outlet water temperature detecting means 26, and a heat source side flow rate detecting means 27 for detecting the amount of hot water circulating on the heat source side of the heat exchanger 20. Further, the control means 28 controls the capacity by setting the rotation speed of the compressor 1 to a predetermined rotation speed by the frequency control means 29.
[0017]
The operation and operation of the multifunctional water heater configured as described above will be described below. Referring to FIG. 1, a case in which a hot water supply operation is performed using atmospheric heat with a heat pump heat source will be described. The high-temperature and high-pressure refrigerant discharged from the compressor 1 and having a temperature equal to or higher than the critical pressure flows into the radiator 12, and exchanges heat with the water sent from the lower part of the hot water storage tank 4 through the hot water supply heat exchanger 14. The rotation speed of the circulation pump 5 is controlled so that the hot water at the outlet of the hot water supply heat exchanger 14 becomes a predetermined temperature with the high-temperature refrigerant flowing into the radiator 12, and hot water at a predetermined temperature flows in from the upper part of the hot water storage tank 4. Hot water is stored.
[0018]
Next, a case where the heat radiating means 17 is used (for example, floor heating) will be described. The heat medium which is radiated by the heat radiating means 17 to have a medium / low temperature and sent by the heat radiating pump 18 exchanges heat with the high temperature hot water in the upper part of the hot water storage tank 4 sent by the hot water pump 19 in the heat exchanger 20. Then, the process returns to the heat radiation means 17. On the other hand, the high-temperature hot water in the upper portion of the hot water tank 4 sent by the hot water pump 19 returns to a medium temperature and returns to the hot water tank 4. The heat medium circulating through the heat radiating means 17 includes antifreeze and water.
[0019]
When the amount of heat stored in the hot water storage tank 4 decreases while the heat radiating means 17 is used, the above hot water supply operation is performed. In this case, the control means 28 discharges from the temperature difference obtained from the heat source side inlet water temperature detecting means 25 and the heat source side outlet water temperature detecting means 26, which are the heat radiation ability detecting means 24, and the circulation amount of water obtained from the heat source side flow rate detecting means 27. Calculate the calorific value. Further, the control means 28 determines the heating amount based on the temperature difference obtained from the heating inlet water temperature detecting means 22 and the heating outlet water temperature detecting means 15 which are the heating capacity detecting means 21 and the circulation amount of the water obtained from the heating flow rate detecting means 23. Is calculated. Then, if the heating amount is smaller than the calculated heat release amount, the control unit 28 controls the frequency control unit 29 so that the capacity of the compressor 1 is increased.
[0020]
As described above, since the amount of heat in the heating unit 11 is controlled to be larger than the amount of heat radiation in the heat radiation unit 17, it is possible to reduce running out of hot water even when heating is continued for a long time.
[0021]
Further, in this embodiment, the heat source provided at the heat source side inlet and the outlet of the heat exchanger 20 in which the hot water in the hot water tank 4 and the heat medium of the heat radiating means 17 exchange heat as the heat radiating ability detecting means 24 for detecting the heat radiating amount. It is composed of a side inlet water temperature detecting means 25, a heat source side outlet water temperature detecting means 26, and a heat source side flow rate detecting means 27 for detecting the amount of hot water circulating on the heat source side of the heat exchanger 20, as shown in FIG. As described above, as the heat radiation capability detecting means 24 for detecting the heat radiation amount, the use side entrance temperature detection provided at the use side entrance and the exit of the heat exchanger 20 in which the hot water in the hot water tank 4 and the heat medium of the heat radiation means 17 exchange heat. And a utilization-side exit temperature detection means 31 for detecting the amount of heat medium circulating on the utilization side of the heat exchanger 20. Temperature obtained from the side outlet temperature detecting means 31 Be calculated heat radiation amount from the circulation amount of heat medium obtained difference from the use-side flow rate detecting unit 32, the same action as described above, effects are obtained.
[0022]
Further, as shown in FIGS. 1 and 2 described above, even if the heating amount and the heat radiation amount are not calculated by the direct heating capability detecting means 21 or the heat radiation capability detecting means 24, the heating amount and the heat radiation amount for the operating state are obtained in advance. If the heating capacity storage means 33 and the heat dissipation capacity storage means 34 are stored, the heating amount and the heat dissipation amount can be estimated from the indirect operation state. For example, as shown in FIG. 3, the heating amount can be estimated from the outside air temperature detecting means 35 for detecting the outside air temperature, the heating inlet water temperature detecting means 22, the heating outlet water temperature detecting means 15, and the rotation speed of the compressor 1. This relationship is stored in the heating capacity storage means 33. Further, since the amount of heat radiation can be estimated from the output of the heat source side inlet water temperature detecting means 25, the use side inlet temperature detecting means 30, and the hot water pump 19, this relation is stored in the heat radiation capacity storage means. Then, when performing the hot water supply operation when the amount of heat held in the hot water storage tank 4 is reduced while using the heat radiating means 17, the heating amount and the heat radiating amount obtained from the heating capacity storing means 33 and the heat radiating capacity storing means 34 are used. The same operation and effect as described above can be obtained.
[0023]
Further, in the present embodiment, the case where the heat radiating means 17 is used for floor heating has been described, but the heat radiating means 17 may be used for bath reheating. In this case, there is an effect that the hot water does not run out even when the bath is reheated for a long time.
[0024]
【The invention's effect】
As described above, according to the present invention, since the heating amount in the heating unit is controlled to be larger than the heat dissipation amount in the heat radiating unit, the case where the heat dissipation from the heat radiating unit continues for a long time (for example, the heating for a long time is continued) ) Can reduce the possibility of running out of hot water.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a multi-function water heater according to the present invention. FIG. 2 is a configuration diagram showing a first other embodiment of the multi-function water heater. FIG. 3 is a second diagram of the multi-function water heater. FIG. 4 is a configuration diagram of a multifunction water heater in a conventional example. FIG. 5 is a configuration diagram of a second multifunction water heater in a conventional example.
4 Hot water storage tank 11 Heating means 17 Heat radiating means 28 Control means

Claims

Heating means, a hot water tank for storing hot water heated by the heating means, a heat radiating means using hot water in the hot water tank as a heat source, and a heating amount in the heating means larger than a heat radiation amount in the heat radiating means. A water heater provided with control means for controlling.

As a heating ability detecting means for detecting a heating amount, a heating inlet water temperature detecting means and a heating outlet water temperature detecting means for detecting water temperatures at an inlet and an outlet of the heating means, and a heating means for detecting a flow rate of water flowing through the heating means. The water heater according to claim 1, further comprising a flow rate detecting means.

As a heat radiation capacity detecting means for detecting a heat radiation amount, a heat source side inlet water temperature detecting means and a heat source side outlet water temperature detecting means provided at a heat source side inlet and an outlet of a heat exchanger in which hot water in a hot water tank and a heat medium of a heat radiating means exchange heat. The water heater according to claim 1 or 2, further comprising means and a heat source side flow rate detecting means for detecting a circulation amount of the hot water circulating in the heat source side water circuit of the heat exchanger.

As a heat radiation capacity detecting means for detecting a heat radiation amount, a use side entrance temperature detection means and a use side exit temperature detection provided at a use side entrance and an exit of a heat exchanger in which hot water in a hot water tank and a heat medium of a heat radiating means exchange heat. The water heater according to claim 1 or 2, further comprising means and a use-side flow rate detection means for detecting a circulation amount of the heat medium circulating in the use-side circuit of the heat exchanger.

The water heater according to any one of claims 1 to 4, wherein the heating means is a heat pump.

The water heater according to claim 5, further comprising control means for controlling a heating amount by controlling a capacity of the compressor.