JP3931894B2 - Water heater - Google Patents

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JP3931894B2
JP3931894B2 JP2004214024A JP2004214024A JP3931894B2 JP 3931894 B2 JP3931894 B2 JP 3931894B2 JP 2004214024 A JP2004214024 A JP 2004214024A JP 2004214024 A JP2004214024 A JP 2004214024A JP 3931894 B2 JP3931894 B2 JP 3931894B2
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hot water
heat source
source side
bath
temperature
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JP2006038243A (en
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昌宏 尾浜
竹司 渡辺
立群 毛
誠一 安木
一彦 丸本
隆幸 高谷
哲英 倉本
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2309/00Gas cycle refrigeration machines
    • F25B2309/06Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
    • F25B2309/061Compression machines, plants or systems characterised by the refrigerant being carbon dioxide with cycle highest pressure above the supercritical pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2339/00Details of evaporators; Details of condensers
    • F25B2339/04Details of condensers
    • F25B2339/047Water-cooled condensers

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  • Control For Baths (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Description

本発明は風呂の追い焚き機能を備える貯湯式の給湯機に関するものである。 The present invention relates to a hot water storage type water heater having a bath retreat function.

従来、この種の給湯機として、貯湯槽の温水を利用した浴槽の追い焚き機能を持ったものがある(例えば、特許文献1参照)。 Conventionally, as this type of water heater, there is one having a reheating function of a bathtub using hot water of a hot water tank (see, for example, Patent Document 1).

図2は、特許文献1に記載された従来の給湯機を示すものである。同図に示すように、この給湯機は、圧縮機1、冷媒対水熱交換器である給湯熱交換器2及び蒸発器3などを備えたヒートポンプユニット4と、貯湯槽5及び水対水熱交換器である風呂熱交換器6などを備えた給湯ユニット7とから構成している。前記貯湯槽5は給湯熱交換器2を用いて前記ヒートポンプユニット4により加熱された湯を貯湯するものである。また、風呂熱交換器6は、貯湯槽5内の湯を循環させて浴槽8内の湯を加熱するものである。すなわち、貯湯槽5の上部から熱源側循環ポンプ9から汲み出された湯は、風呂熱交換器6に導かれて、利用側循環ポンプ10から汲み出された浴槽8内の湯または水を加熱した後に、貯湯槽5に戻る。また、貯湯槽5の湯は浴槽注湯配管11を通して浴槽8へ注湯され、さらに、蛇口12を開くことにより給湯ができるように構成したものである。
特開2002−243275号公報
FIG. 2 shows a conventional water heater described in Patent Document 1. As shown in FIG. As shown in the figure, this hot water supply machine includes a compressor 1, a heat pump unit 4 including a hot water supply heat exchanger 2 and an evaporator 3 which are refrigerant to water heat exchangers, a hot water tank 5 and water to water heat. The hot water supply unit 7 includes a bath heat exchanger 6 that is an exchanger. The hot water storage tank 5 stores hot water heated by the heat pump unit 4 using the hot water supply heat exchanger 2. The bath heat exchanger 6 heats the hot water in the bathtub 8 by circulating the hot water in the hot water tank 5. That is, hot water pumped from the heat source side circulation pump 9 from the upper part of the hot water tank 5 is led to the bath heat exchanger 6 to heat the hot water or water in the bathtub 8 pumped from the use side circulation pump 10. After that, the hot water tank 5 is returned to. Further, the hot water in the hot water tank 5 is poured into the bathtub 8 through the bathtub pouring pipe 11, and the hot water can be supplied by opening the faucet 12.
JP 2002-243275 A

しかしながら、前記従来の構成では、次のような課題を有していた。一般的に給湯負荷としては夕方から夜にかけて集中するので、貯湯槽5の残湯量はこの時間帯に最も少なくなる。特に浴槽8へ湯張りのための注湯や、その前後に、台所での給湯負荷や風呂でのシャワー等による給湯負荷が続けてあった場合には、貯湯槽5の残湯量が極端に減少する場合がある。このような状況下で、さらに、風呂の追い焚き運転の要求が重なった場合には貯湯槽5の上部の湯が使用されるので、給湯時に所定の給湯温度の湯が蛇口12から出ずに湯切れが発生することがある。また、場合によっては風呂の追い焚きそのものができなかったり、風呂の追い焚き能力が極端に低下し、なかなか浴槽8の温度が上昇しないとい
う課題があった。
However, the conventional configuration has the following problems. Since the hot water supply load is generally concentrated from evening to night, the amount of hot water remaining in the hot water tank 5 is the smallest during this time period. The amount of hot water remaining in the hot water tank 5 is extremely reduced especially when hot water is poured into the bathtub 8 for hot water filling, and before and after that, hot water supply load in the kitchen or shower in the bath continues. There is a case. Under such circumstances, when the request for reheating the bath overlaps, the hot water in the upper part of the hot water tank 5 is used, so that hot water having a predetermined hot water temperature does not come out of the tap 12 during hot water supply. Hot water runs out. Moreover, depending on the case, there was a problem that the bath reheating itself could not be performed, or the bath reheating ability was extremely lowered, and the temperature of the bathtub 8 did not easily increase.

本発明は上記課題を解決するもので、貯湯槽5の残湯量が少なくなったときには、風呂の加熱能力を減少し湯切れの可能性を少なくし、かつ、風呂の追い焚き運転ができない状態を少なくして、快適性と利便性の向上を図った給湯機を提供することを目的とする。   The present invention solves the above-mentioned problem. When the amount of remaining hot water in the hot water storage tank 5 decreases, the heating capacity of the bath is reduced, the possibility of running out of hot water is reduced, and the bath cannot be reheated. The object is to provide a water heater that is reduced in comfort and convenience.

前記従来の課題を解決するために、本発明の給湯機は、給湯加熱手段と、前記給湯加熱手段で加熱した温水を貯湯する貯湯槽と、前記貯湯槽から循環させる熱源側の温水と浴槽から循環させる利用側の水又は温水とが熱交換する風呂熱交換器と、前記貯湯槽に貯湯された温水を前記風呂熱交換器へ循環させる熱源側循環手段と、前記浴槽から水又は温水を前記風呂熱交換器へ循環させる利用側循環手段と、前記風呂熱交換器の熱源側出口温度を検出する熱源側出口温度検出手段と、前記風呂熱交換器の利用側入口温度を検出する利用側入口温度検出手段と、前記貯湯槽の残湯量を検出する残湯量検出手段と、前記熱源側循環手段および前記利用側循環手段の動作を制御する制御手段とを備え、前記残湯量検出手段が検出した残湯量が所定値より少ないときには多いときより、前記熱源側出口温度検出手段が検出する前記風呂熱交換器の熱源側出口温度と前記利用側入口温度検出手段が検出する前記風呂熱交換器の利用側入口温度との温度差が小さくなるように、前記熱源側循環手段の回転数を制御することを特徴とするものである。 In order to solve the conventional problems, a water heater of the present invention includes a hot water heating means, a hot water storage tank for storing hot water heated by the hot water heating means, a hot water on the heat source side circulated from the hot water storage tank, and a bathtub. A bath heat exchanger that exchanges heat with water or hot water on the use side to be circulated, heat source side circulation means that circulates hot water stored in the hot water storage tank to the bath heat exchanger, and water or hot water from the bathtub Use side circulation means for circulating to the bath heat exchanger, heat source side outlet temperature detection means for detecting the heat source side outlet temperature of the bath heat exchanger, and use side inlet for detecting the use side inlet temperature of the bath heat exchanger A temperature detecting means; a remaining hot water amount detecting means for detecting a remaining hot water amount in the hot water storage tank; and a control means for controlling the operation of the heat source side circulating means and the use side circulating means. The amount of remaining hot water is a predetermined value The temperature between the heat source side outlet temperature of the bath heat exchanger detected by the heat source side outlet temperature detection means and the usage side inlet temperature of the bath heat exchanger detected by the usage side inlet temperature detection means is higher than when it is low. The number of rotations of the heat source side circulation means is controlled so that the difference becomes small .

これによって、貯湯槽の残湯量が少なくなったときには風呂の加熱能力を減少して湯の使用量を少なくすることで、湯切れの可能性を少なくし、かつ、風呂の追い焚き運転ができない状態を少なくすることができる。   As a result, when the amount of hot water remaining in the hot water tank decreases, the heating capacity of the bath is reduced to reduce the amount of hot water used, thereby reducing the possibility of running out of hot water and preventing the bath from being reheated. Can be reduced.

本発明の給湯機は、貯湯槽の残湯量が少なくなったときには、風呂の加熱能力を減少して湯の使用量を少なくすることで、湯切れの可能性を少なくし、かつ、風呂の追い焚き運転ができない状態を少なくして、快適性と利便性の向上を図ることができる。   The water heater of the present invention reduces the possibility of running out of hot water by reducing the amount of hot water used by reducing the heating capacity of the bath when the amount of hot water remaining in the hot water storage tank is small, and further replenishing the bath. It is possible to improve comfort and convenience by reducing the state in which the user cannot perform the whispering operation.

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、第1の発明は、給湯加熱手段と、前記給湯加熱手段で加熱した温水を貯湯する貯湯槽と、前記貯湯槽から循環させる熱源側の温水と浴槽から循環させる利用側の水又は温水とが熱交換する風呂熱交換器と、前記貯湯槽に貯湯された温水を前記風呂熱交換器へ循環させる熱源側循環手段と、前記浴槽から水又は温水を前記風呂熱交換器へ循環させる利用側循環手段と、前記風呂熱交換器の熱源側出口温度を検出する熱源側出口温度検出手段と、前記風呂熱交換器の利用側入口温度を検出する利用側入口温度検出手段と、前記貯湯槽の残湯量を検出する残湯量検出手段と、前記熱源側循環手段および前記利用側循環手段の動作を制御する制御手段とを備え、前記残湯量検出手段が検出した残湯量が所定値より少ないときには多いときより、前記熱源側出口温度検出手段が検出する前記風呂熱交換器の熱源側出口温度と前記利用側入口温度検出手段が検出する前記風呂熱交換器の利用側入口温度との温度差が小さくなるように、前記熱源側循環手段の回転数を制御することを特徴とするもので、湯槽の残湯量が少なくなったときには、風呂の加熱能力を減少して湯の使用量を少なくするので、湯切れの可能性を少なくし、かつ、風呂の追い焚き運転ができない状態を少なくして、快適性と利便性の向上を図ることができる。 The present invention can be carried out in the form described in each claim, and the first invention is a hot water supply heating means, a hot water storage tank for storing hot water heated by the hot water supply heating means, and a heat source circulated from the hot water storage tank. A bath heat exchanger for exchanging heat between the hot water on the side and the water on the use side or hot water circulated from the bathtub, heat source side circulation means for circulating the hot water stored in the hot water storage tank to the bath heat exchanger, and the bathtub The use side circulation means for circulating water or hot water from the bath heat exchanger to the bath heat exchanger, the heat source side outlet temperature detection means for detecting the heat source side outlet temperature of the bath heat exchanger, and the use side inlet temperature of the bath heat exchanger Use side inlet temperature detection means for detecting the amount of remaining hot water in the hot water storage tank, control means for controlling the operation of the heat source side circulation means and the use side circulation means, Detected by hot water detection means When the amount of hot water is less than a predetermined value, the heat source side outlet temperature detection means detects the heat source side outlet temperature detected by the heat source side outlet temperature detection means and the use side inlet temperature detection means detects the bath heat exchanger use side. The number of rotations of the heat source side circulation means is controlled so that the temperature difference from the inlet temperature is small. When the remaining amount of hot water in the hot water tank decreases, the heating capacity of the bath is reduced to reduce the hot water capacity. Since the amount of water used is reduced, the possibility of running out of hot water is reduced, and the state in which the bath cannot be reheated is reduced, thereby improving comfort and convenience.

また、風呂熱交換器で熱交換した後に貯湯槽に戻る湯温を所定の温度範囲にすることができるので、貯湯槽に戻った湯を再沸き上げするときの効率を高くすることができる。Moreover, since the hot water temperature which returns to a hot water tank after exchanging heat with a bath heat exchanger can be made into a predetermined temperature range, the efficiency at the time of reboiling the hot water which returned to the hot water tank can be made high.

また、浴槽の温度に応じて風呂熱交換器の熱源側出口温度を調整できるので、貯湯槽のIn addition, the heat source side outlet temperature of the bath heat exchanger can be adjusted according to the temperature of the bathtub,
湯を有効に利用でき、かつ、貯湯槽に戻った湯を再沸き上げするときの効率を高くすることができる。Hot water can be used effectively, and the efficiency at the time of reboiling the hot water returned to the hot water tank can be increased.

また、貯湯槽の湯の使用量を少なくするので、湯切れの可能性を少なくし、かつ、風呂の追い焚き運転ができない状態を少なくすることができる。Further, since the amount of hot water used in the hot water tank is reduced, the possibility of running out of hot water is reduced, and the state in which the bath cannot be reheated can be reduced.

第2の発明は、特に、第1の発明の残湯量検出手段は、貯湯槽に設けられた前記貯湯槽の温度を検出する複数の残湯温度検出手段とすることにより、通常の給湯負荷や風呂の追い焚きに必要な湯温または湯量を確保し、更に、風呂の加熱能力を制御するので、湯切れの可能性を少なくし、かつ、風呂の追い焚き運転ができない状態を少なくしすることができる。 In the second invention, in particular, the remaining hot water amount detecting means of the first invention is a plurality of remaining hot water temperature detecting means for detecting the temperature of the hot water storage tank provided in the hot water storage tank. To secure the hot water temperature or amount necessary for bathing, and to control the heating capacity of the bath, reduce the possibility of running out of hot water, and reduce the state where bath bathing cannot be performed. Can do.

第3の発明は、風呂熱交換器の熱源側出口温度を低くするように熱源側循環手段の回転数を制御することにより、貯湯槽の湯を有効に利用でき、かつ、貯湯槽に戻った湯を再沸き上げするときの効率を高くすることができる。 In the third invention, by controlling the rotation speed of the heat source side circulation means so as to lower the heat source side outlet temperature of the bath heat exchanger, the hot water in the hot water tank can be used effectively and returned to the hot water tank. Efficiency when re-boiling hot water can be increased.

第4の発明は、熱源側出口温度検出手段が検出する風呂熱交換器の熱源側出口温度と利用側入口温度検出手段が検出する風呂熱交換器の利用側入口温度との温度差が小さくなるように、熱源側循環手段の回転数を制御する残湯量を第一の所定の残湯量とし、前記第一の所定の残湯量よりも多い量に設定された第二の所定の残湯量を有し、残湯量が前記第二の所定の残湯量よりも少ないときは、貯湯槽を沸き上げる給湯加熱運転を行うことにより、通常の給湯負荷や風呂の追い焚きに必要な湯量を確保するので、湯切れの可能性を少なくし、かつ、風呂の追い焚き運転ができない状態を少なくしすることができる。 In the fourth invention, the temperature difference between the heat source side outlet temperature of the bath heat exchanger detected by the heat source side outlet temperature detecting means and the user side inlet temperature of the bath heat exchanger detected by the user side inlet temperature detecting means becomes small. As described above, the amount of remaining hot water for controlling the rotation speed of the heat source side circulation means is set as a first predetermined remaining hot water amount, and a second predetermined remaining hot water amount set to an amount larger than the first predetermined remaining hot water amount is provided. and, when the remaining hot water is less than the second predetermined remaining hot water by performing the hot-water supply heating operation to raise boiling the hot water storage tank, since to secure the amount of hot water required for reheating of conventional hot-water supply load and the bath, The possibility of running out of hot water is reduced, and the state in which the bath cannot be rerun is reduced.

第5の発明は、熱源側出口温度検出手段が検出する風呂熱交換器の熱源側出口温度と利用側入口温度検出手段が検出する風呂熱交換器の利用側入口温度との温度差が小さくなるように、熱源側循環手段の回転数を制御する残湯量を第一の所定の残湯量とし、前記第一の所定の残湯量よりも少ない量に設定された第三の所定の残湯量を有し、残湯量が前記第三の所定の残湯量よりも少ないときは、熱源側循環手段を停止させるようにすることにより、最低限の給湯負荷に対応する湯を確保することができるので、湯切れの可能性を少なくすることができる。 In the fifth invention, the temperature difference between the heat source side outlet temperature of the bath heat exchanger detected by the heat source side outlet temperature detecting means and the user side inlet temperature of the bath heat exchanger detected by the user side inlet temperature detecting means becomes small. As described above, the amount of remaining hot water for controlling the rotation speed of the heat source side circulation means is set as a first predetermined remaining hot water amount, and a third predetermined remaining hot water amount set to an amount smaller than the first predetermined remaining hot water amount is provided. and, when the remaining hot water is less than the third predetermined remaining hot water, by so as to stop the heat-source-side circulating means, it is possible to secure a hot water corresponding to the minimum hot water supply load, the hot water The possibility of cutting can be reduced.

第6の発明は、風呂熱交換器の熱源側入口温度が浴槽の温度よりも所定の温度差以上高くない場合に、熱源側循環手段を停止させるようにすることにより、無駄な風呂追い焚き運転を防止できる。 According to a sixth aspect of the present invention, when the heat source side inlet temperature of the bath heat exchanger is not higher than the temperature of the bathtub by a predetermined temperature difference or more, the heat source side circulation means is stopped so that the wasteful bath reheating operation is performed. Can be prevented.

第7の発明は、熱源側循環手段を停止させる場合に、そのことを知らせる警報装置を備えることにより、残湯量が少なくなったことを利用者に知らせることができるので、湯切れに対する対処ができ、利便性を改善することができる。 In the seventh aspect of the present invention, when the heat source side circulation means is stopped, the user can be notified that the amount of remaining hot water has decreased by providing an alarm device for notifying the fact, so that it is possible to cope with hot water shortage. , Can improve convenience.

第8の発明は、前述の構成に加え、給湯加熱手段をヒートポンプサイクルとすることによって、高能力省エネルギー化をはかる。 In addition to the above-described configuration, the eighth invention achieves high-performance energy saving by using a hot water supply heating means as a heat pump cycle.

第9の発明は、ヒートポンプサイクルに封入する冷媒を二酸化炭素としているので、高温高効率化と地球環境保全をはかるができる。 In the ninth aspect of the invention, since the refrigerant sealed in the heat pump cycle is carbon dioxide, high temperature and high efficiency can be achieved and the global environment can be protected.

以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。   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.

(実施の形態1)
図1は、本発明の第1の実施の形態における給湯機の構成図である。図1において、給湯機の熱源である給湯加熱手段13は、圧縮機1、給湯熱交換器2、減圧装置14および大気熱を吸熱する蒸発器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。貯湯槽5への給水は貯湯槽5下部に接続された給水管15を通ってなされ、貯湯槽5上部の高温の湯は出湯管16を通り混合弁17で給水と混合することによって所定の温度の湯にしてから給湯管18を通って端末(蛇口12)から給湯される。また、貯湯槽5の下部から循環ポンプ19,給湯熱交換器2および貯湯槽5の上部を順次接続する沸き上げ回路を構成することによって、貯湯槽5から循環ポンプ19で送られてきた水は前記給湯熱交換器2で冷媒熱により加熱されて貯湯槽5の上から貯湯される。20は沸き上げ温度検出手段であり、ヒートポンプ熱源で加熱した湯温を検出するため給湯熱交換器2の水側の出口に設けられている。
(Embodiment 1)
FIG. 1 is a configuration diagram of a water heater in the first embodiment of the present invention. In FIG. 1, hot water heating means 13 that is a heat source of a hot water heater is a heat pump heat source that constitutes a heat pump cycle including a compressor 1, a hot water supply heat exchanger 2, a decompression device 14, and an evaporator 3 that absorbs 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. Water supply to the hot water tank 5 is made through a water supply pipe 15 connected to the lower part of the hot water tank 5, and hot water at the upper part of the hot water tank 5 passes through the hot water discharge pipe 16 and is mixed with the water supply by a mixing valve 17 to a predetermined temperature. Then, hot water is supplied from the terminal (faucet 12) through the hot water supply pipe 18. In addition, by forming a boiling circuit that sequentially connects the lower part of the hot water tank 5 to the circulation pump 19, the hot water supply heat exchanger 2, and the upper part of the hot water tank 5, the water sent from the hot water tank 5 by the circulation pump 19 is Hot water is stored in the hot water storage tank 5 by being heated by the refrigerant heat in the hot water supply heat exchanger 2. A boiling temperature detecting means 20 is provided at the water-side outlet of the hot water supply heat exchanger 2 in order to detect the hot water temperature heated by the heat pump heat source.

風呂加熱手段21は、水水熱交換器である風呂熱交換器6と、それに接続された熱源側と利用側水回路と、それら水回路にそれぞれ設けられた熱源側循環ポンプ9と利用側循環ポンプ10などからなる。そして、浴槽8の加熱は、熱源側循環ポンプ9で貯湯槽5から風呂熱交換器6に送られてきた高温の温水と、利用側循環ポンプ10で浴槽8から風呂熱交換器6に送られてきた水又は温水とが熱交換することによって行われる。また22、23、24は貯湯槽5の上下方向の異なる位置に取り付けられた第一、第二、第三の残湯温度検出手段である。さらに、制御手段25は、前記風呂加熱手段21における加熱能力を制御するものである。   The bath heating means 21 includes a bath heat exchanger 6 that is a water / water heat exchanger, a heat source side and a use side water circuit connected thereto, and a heat source side circulation pump 9 and a use side circulation respectively provided in the water circuits. It consists of a pump 10 and the like. Heating of the bathtub 8 is sent from the hot water tank 5 to the bath heat exchanger 6 by the heat source side circulation pump 9 and from the bathtub 8 to the bath heat exchanger 6 by the use side circulation pump 10. This is done by exchanging heat with warm water or hot water. Reference numerals 22, 23, and 24 denote first, second, and third remaining hot water temperature detecting means attached at different positions in the vertical direction of the hot water tank 5. Furthermore, the control means 25 controls the heating capacity in the bath heating means 21.

以上のように構成された給湯機について、以下にその動作、作用を説明する。図1において、先ず、給湯加熱運転について説明する。いま、貯湯槽5を沸き上げる要求(図示せず)があると、ヒートポンプ熱源で大気熱を利用した給湯加熱運転を行う。この場合、圧縮機1から吐出された臨界圧力以上の高温高圧の冷媒が給湯熱交換器2に流入し、ここで貯湯槽5の下部から送られてきた水と熱交換し放熱した後、減圧装置14で減圧し、さらに、蒸発器3で大気から熱を吸熱し、ガス化して圧縮機1に戻る。この時、給湯熱交換器2に流入する高温冷媒で給湯熱交換器2の出口水温が所定温度となるように循環ポンプ19の回転数を制御し、所定の温度の湯が貯湯槽5の上部から流入し貯湯される。   About the hot water heater comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. In FIG. 1, first, the hot water supply heating operation will be described. If there is a request (not shown) for boiling the hot water storage tank 5, a hot water supply heating operation using atmospheric heat is performed with a heat pump heat source. In this case, the high-temperature and high-pressure refrigerant discharged from the compressor 1 is heated to a hot water supply heat exchanger 2 where heat is exchanged with the water sent from the lower part of the hot water tank 5 to dissipate the heat. The pressure is reduced by the apparatus 14, and heat is absorbed from the atmosphere by the evaporator 3, gasified, and returned to the compressor 1. At this time, the number of revolutions of the circulation pump 19 is controlled so that the outlet water temperature of the hot water supply heat exchanger 2 becomes a predetermined temperature with the high-temperature refrigerant flowing into the hot water supply heat exchanger 2, and hot water of a predetermined temperature is It flows in from and is stored.

次に、通常(残湯が十分ある場合)の風呂加熱運転について説明する。いま、風呂の加熱要求(図示せず)があると、制御手段25は利用側循環ポンプ10と熱源側循環ポンプ9とを駆動する。そして、利用側循環ポンプ10によって浴槽8から送られてきた水は、熱源側循環ポンプ9によって送られてきた貯湯槽5上部の高温の湯と、風呂熱交換器6で熱交換して加熱されて浴槽8に戻る。   Next, normal bath heating operation (when there is sufficient remaining hot water) will be described. Now, when there is a bath heating request (not shown), the control means 25 drives the use side circulation pump 10 and the heat source side circulation pump 9. And the water sent from the bathtub 8 by the use side circulation pump 10 is heated by exchanging heat with the hot water in the upper part of the hot water tank 5 sent by the heat source side circulation pump 9 in the bath heat exchanger 6. Return to bathtub 8.

この時、風呂熱交換器6の熱源側入口水温つまり貯湯槽5の上部の温度が同じであれば、一般的に、熱源側循環ポンプ9の流量が多い方が風呂の加熱能力が大きく、風呂熱交換器6で放熱して貯湯槽5の下部に戻る湯の温度も高い。逆に、熱源側循環ポンプ9の流量が少ない方が風呂の加熱能力が小さく、風呂熱交換器6で放熱して貯湯槽5の下部に戻る湯の温度も低い。   At this time, if the heat source side inlet water temperature of the bath heat exchanger 6, that is, the temperature of the upper part of the hot water storage tank 5 is the same, generally, the larger the flow rate of the heat source side circulation pump 9, the larger the heating capacity of the bath. The temperature of the hot water that radiates heat in the heat exchanger 6 and returns to the lower part of the hot water tank 5 is also high. On the other hand, the smaller the flow rate of the heat source side circulation pump 9, the smaller the heating capacity of the bath, and the lower the temperature of hot water that radiates heat in the bath heat exchanger 6 and returns to the lower part of the hot water tank 5.

一方、熱源側循環ポンプ9の流量が同じであれば、一般的に、貯湯槽5の上部の温度が高い場合、つまり風呂熱交換器6の熱源側入口水温が高い場合の方が風呂の加熱能力が大きく、風呂熱交換器6で放熱して貯湯槽5の下部に戻る湯の温度も高い。逆に、貯湯槽5の上部の温度が低い場合、つまり風呂熱交換器6の熱源側入口水温が低い場合の方が風呂の加熱能力が小さく、風呂熱交換器6で放熱して貯湯槽5の下部に戻る湯の温度も低い。この貯湯槽5下部に戻った湯は必要に応じて前述した給湯加熱運転で所定温度まで加熱されて貯湯槽5の上部に貯湯される。この給湯加熱運転の時の運転効率は、給湯熱交換器2
の入口水温つまり貯湯槽5の下部の温度が高くなると悪くなる。
On the other hand, if the flow rate of the heat source side circulation pump 9 is the same, generally, the temperature of the upper part of the hot water tank 5 is higher, that is, the heat source side inlet water temperature of the bath heat exchanger 6 is higher. The capacity of the hot water that is radiated by the bath heat exchanger 6 and returned to the lower part of the hot water tank 5 is high. On the contrary, when the temperature of the upper part of the hot water tank 5 is low, that is, when the temperature of the heat source side inlet water of the bath heat exchanger 6 is lower, the heating capacity of the bath is smaller. The temperature of the hot water that goes back to the bottom is also low. The hot water returned to the lower part of the hot water tank 5 is heated to a predetermined temperature by the hot water heating operation described above as needed and stored in the upper part of the hot water tank 5. The operating efficiency during this hot water heating operation is as follows:
As the inlet water temperature of the water, that is, the temperature of the lower part of the hot water storage tank 5 increases, the temperature becomes worse.

このように、風呂加熱の能力は大きければ良いというわけでなく、貯湯槽5の上部の高温の湯は風呂熱交換器6で放熱した後、貯湯槽5の下部に戻るが、その戻り温度がその後の給湯加熱運転の性能に影響する。さらに、貯湯槽5に戻る温度が高いとその後の給湯加熱運転の効率が悪くなるだけでなく、高温の湯が持っている熱エネルギーを十分使用していないことにもなる。逆に、貯湯槽5に戻る温度が低すぎると、風呂加熱能力が不足し、浴槽8の温度がなかなか上昇しないということになる。   Thus, the capacity of the bath heating is not necessarily large, and the hot water at the upper part of the hot water tank 5 is radiated by the bath heat exchanger 6 and then returns to the lower part of the hot water tank 5, but the return temperature is It affects the performance of the subsequent hot water heating operation. Further, if the temperature returning to the hot water tank 5 is high, not only the efficiency of the subsequent hot water heating operation is deteriorated, but also the thermal energy possessed by the hot water is not sufficiently used. On the other hand, if the temperature returning to the hot water tank 5 is too low, the bath heating capacity will be insufficient, and the temperature of the bathtub 8 will not rise easily.

そこで、図1に示すように風呂熱交換器6の熱源側出口温度を検出する熱源側出口温度検出手段26と風呂熱交換器6の利用側入口温度を検出する利用側入口温度検出手段27とを設け、この両者の温度差で熱源側の温水の流量を制御する。例えば、前記温度差ΔT=5(K)一定になるように制御すれば、浴槽8の温度が変化しても貯湯槽5への戻り温度も比較的低くすることができ、かつ、風呂加熱能力も比較的大きくすることができる。つまり、制御手段25は、熱源側出口温度検出手段26と利用側入口温度検出手段27とから得られた風呂熱交換器6の熱源側出口温度と利用側入口温度を検出し、この両者の温度差が5Kになるように熱源側循環ポンプ9の回転数を制御する。   Therefore, as shown in FIG. 1, a heat source side outlet temperature detecting means 26 for detecting the heat source side outlet temperature of the bath heat exchanger 6 and a use side inlet temperature detecting means 27 for detecting the use side inlet temperature of the bath heat exchanger 6; And the flow rate of the hot water on the heat source side is controlled by the temperature difference between the two. For example, if the temperature difference ΔT = 5 (K) is controlled to be constant, the return temperature to the hot water tank 5 can be made relatively low even if the temperature of the bathtub 8 changes, and the bath heating capability Can also be made relatively large. That is, the control means 25 detects the heat source side outlet temperature and the use side inlet temperature of the bath heat exchanger 6 obtained from the heat source side outlet temperature detection means 26 and the use side inlet temperature detection means 27, and the temperature of both of them. The rotational speed of the heat source side circulation pump 9 is controlled so that the difference becomes 5K.

次に、残湯が少ない場合の風呂加熱運転について説明する。前述したように貯湯槽5の表面に第一の残湯温度検出手段22を設ける。前記第一の残湯温度検出手段22を設ける位置は、浴槽8への湯張りである風呂注湯直後の給湯負荷と風呂加熱負荷と給湯加熱能力とから湯切れを考慮して設定する。いま、残湯量が第一の残湯温度検出手段22の設けている位置よりも多い場合は、前述した通常(残湯が十分ある場合)の風呂加熱運転を行う。そして、給湯負荷が多いか、または、さらに風呂加熱運転を続けることによって、残湯量が第一の残湯温度検出手段22を設ける位置より少なくなると、風呂加熱能力を減少させる。   Next, the bath heating operation when there is little remaining hot water will be described. As described above, the first remaining hot water temperature detecting means 22 is provided on the surface of the hot water tank 5. The position where the first remaining hot water temperature detecting means 22 is provided is set in consideration of running out of hot water from the hot water supply load immediately after pouring the bath, which is the hot water filling of the bathtub 8, the bath heating load, and the hot water supply heating capacity. If the amount of remaining hot water is larger than the position where the first remaining hot water temperature detecting means 22 is provided, the normal bath heating operation described above (when there is sufficient remaining hot water) is performed. When the hot water supply load is large or the bath heating operation is continued, the bath heating capacity is decreased when the remaining hot water amount becomes smaller than the position where the first remaining hot water temperature detecting means 22 is provided.

つまり、制御手段25は、第一の残湯温度検出手段22からの信号で残湯温度を検出し、第一の残湯温度検出手段22の設けている位置に残湯がなくなったことを検出すれば、風呂加熱能力が減少するように熱源側循環ポンプ9の回転数を制御する。   That is, the control means 25 detects the remaining hot water temperature based on the signal from the first remaining hot water temperature detection means 22 and detects that there is no remaining hot water at the position where the first remaining hot water temperature detection means 22 is provided. Then, the rotation speed of the heat source side circulation pump 9 is controlled so that the bath heating capacity is reduced.

すなわち、熱源側出口温度検出手段26と利用側入口温度検出手段27とから得られた風呂熱交換器6の熱源側出口温度と利用側入口温度を検出し、この両者の温度差が通常(残湯が十分ある場合)の風呂加熱運転の場合の5Kよりも小さい温度差(例えば2K)になるように熱源側循環ポンプ9の回転数を制御する。   That is, the heat source side outlet temperature and the use side inlet temperature of the bath heat exchanger 6 obtained from the heat source side outlet temperature detection means 26 and the use side inlet temperature detection means 27 are detected, and the temperature difference between the two is normal (residual). The number of rotations of the heat source side circulation pump 9 is controlled so that the temperature difference (for example, 2K) is smaller than 5K in the bath heating operation (when there is sufficient hot water).

この温度差の設定は、風呂熱交換器6に熱源として供給される貯湯槽5の上部の温度や、必要とされる浴槽8の加熱熱量や給湯加熱手段13の加熱能力などから設定すればよい。また、第一の残湯温度検出手段22の設けている位置における残湯の有無は、第一の残湯温度検出手段22の設けている位置の温度が所定の温度より高いか低いかで判断すればよい。例えば、50℃以上であれば残湯があるとし、50℃未満であれば残湯がないとする。   The temperature difference may be set based on the temperature of the upper part of the hot water tank 5 supplied as a heat source to the bath heat exchanger 6, the required heating heat of the bathtub 8, the heating capacity of the hot water supply heating means 13, and the like. . The presence or absence of remaining hot water at the position where the first remaining hot water temperature detecting means 22 is provided is determined by whether the temperature at the position where the first remaining hot water temperature detecting means 22 is provided is higher or lower than a predetermined temperature. do it. For example, it is assumed that there is remaining hot water at 50 ° C. or higher, and there is no remaining hot water at less than 50 ° C.

上記説明では風呂加熱能力を減少させるために、風呂熱交換器6の熱源側出口温度と利用側入口温度との温度差を通常(残湯が十分ある場合)の風呂加熱運転の場合よりも小さい温度差になるように制御させていた。風呂熱交換器6の熱源側入口温度(すなわち貯湯槽5の上部温度)と利用側入口温度(すなわち浴槽8の温度)が決まっていれば、風呂熱交換器6の加熱能力は、熱源側の流量と利用側の流量とで決定される。結局、風呂加熱能力を減少させるためには、熱源側の流量または利用側の流量のどちらか一方、または、両方とも少なくすればよい。図1の構成では、直接流量を計測する手段を備えていないが、
熱源側の出口温度の変化を計測して、流量の変化を間接的に求めればよい。
In the above description, in order to reduce the bath heating capacity, the temperature difference between the heat source side outlet temperature of the bath heat exchanger 6 and the use side inlet temperature is smaller than in the case of normal bath heating operation (when there is sufficient remaining hot water). The temperature difference was controlled. If the heat source side inlet temperature of the bath heat exchanger 6 (that is, the upper temperature of the hot water tank 5) and the use side inlet temperature (that is, the temperature of the bathtub 8) are determined, the heating capacity of the bath heat exchanger 6 is It is determined by the flow rate and the flow rate on the user side. Eventually, in order to decrease the bath heating capacity, either the heat source side flow rate or the usage side flow rate, or both, may be reduced. In the configuration of FIG. 1, there is no means for directly measuring the flow rate,
The change in the flow rate may be obtained indirectly by measuring the change in the outlet temperature on the heat source side.

つまり、風呂加熱能力を減少させるためには、風呂熱交換器6の熱源側出口温度を、通常(残湯が十分ある場合)の風呂加熱運転の場合よりも低くするようにすればよい。すなわち、制御手段25は、熱源側出口温度検出手段26から得られた風呂熱交換器6の熱源側出口温度を検出し、この温度が、通常(残湯が十分ある場合)の風呂加熱運転の場合の熱源側出口温度よりも低くなるように熱源側循環ポンプ9の回転数を制御する。   That is, in order to reduce the bath heating capacity, the heat source side outlet temperature of the bath heat exchanger 6 may be set lower than that in the normal bath heating operation (when there is sufficient remaining hot water). That is, the control means 25 detects the heat source side outlet temperature of the bath heat exchanger 6 obtained from the heat source side outlet temperature detection means 26, and this temperature is the normal bath heating operation (when there is sufficient remaining hot water). The number of rotations of the heat source side circulation pump 9 is controlled so as to be lower than the heat source side outlet temperature.

なお、熱源側出口温度を低くして貯湯槽5に戻すと言うことは、貯湯槽5の持っている熱量をより有効に使用していることになる。例えば、貯湯槽5の上部温度が65℃で浴槽8の温度が42℃とする。通常(残湯が十分ある場合)の風呂加熱運転の場合に風呂熱交換器6の熱源側出口温度と利用側入口温度との温度差ΔT=5(K)とし、残湯量が少なくなった場合に前記温度差を2(K)とすると、風呂熱交換器6の熱源側出口温度はそれぞれ47℃と44℃となる。この時、貯湯槽5に貯湯した熱量のうち有効に利用した熱量は次の比で表される。つまり、温度差5(K)時の利用熱量:温度差2(K)時の利用熱量=(65−47):(65−44)となり、能力を減少させた方が、約17%程度有効に利用できることになる。   Note that lowering the heat source side outlet temperature and returning it to the hot water storage tank 5 means that the amount of heat of the hot water storage tank 5 is used more effectively. For example, the upper temperature of the hot water tank 5 is 65 ° C. and the temperature of the bathtub 8 is 42 ° C. When the temperature difference between the heat source side outlet temperature of the bath heat exchanger 6 and the use side inlet temperature is ΔT = 5 (K) in the case of normal (when there is enough remaining hot water) bath heating operation, and the remaining hot water amount decreases If the temperature difference is 2 (K), the heat source side outlet temperature of the bath heat exchanger 6 is 47 ° C. and 44 ° C., respectively. At this time, the amount of heat utilized effectively among the amount of heat stored in the hot water tank 5 is expressed by the following ratio. In other words, the amount of heat used when the temperature difference is 5 (K): the amount of heat used when the temperature difference is 2 (K) = (65-47) :( 65-44). Will be available.

前述の風呂加熱の制御では貯湯槽5の熱量をより有効に利用はできるが、基本的に既に貯湯された熱を使用するだけであり、貯湯槽5の高温湯の量は減少していく。そこで、第一の残湯温度検出手段22の設けている位置と比較して同じかそれより下の位置に第二の残湯温度検出手段23を設ける。そして、残湯量が第二の残湯温度検出手段23を設けている位置より少なくなると、給湯加熱運転を行う。すなわち、貯湯槽5の下部の水を給湯加熱手段13で加熱し、高温の湯にして貯湯槽5の上部に貯湯する。このようにすれば、新たな高温の湯ができ、風呂加熱に必要な熱源となる高温湯が増加することになる。   In the above-described control of bath heating, the amount of heat in the hot water tank 5 can be used more effectively, but basically only the heat already stored is used, and the amount of hot water in the hot water tank 5 decreases. Therefore, the second remaining hot water temperature detecting means 23 is provided at the same position or lower than the position where the first remaining hot water temperature detecting means 22 is provided. When the amount of remaining hot water becomes smaller than the position where the second remaining hot water temperature detecting means 23 is provided, the hot water supply heating operation is performed. That is, the water in the lower part of the hot water storage tank 5 is heated by the hot water supply heating means 13 to be hot water and stored in the upper part of the hot water storage tank 5. If it does in this way, new hot water will be made and the hot water used as a heat source required for bath heating will increase.

上記のように、残湯量が第二の残湯温度検出手段23を設けている位置より少なくなった時に給湯加熱運転を行えば、風呂加熱に必要な熱源となる高温湯が増加するが、この増加量よりも多い給湯負荷があれば、残湯量は減少する。そこで、第一の残湯温度検出手段22の設けている位置より上の位置に第三の残湯温度検出手段24を設ける。この第三の残湯温度検出手段24の位置は最低限の給湯負荷を賄えるところに設ける。そして、残湯量が第三の残湯温度検出手段24を設けている位置より少なくなると、制御手段25は利用側循環ポンプ10と熱源側循環ポンプ9とを停止することによって風呂加熱運転を停止する。ただし、貯湯槽5に湯が貯まれば、風呂加熱運転を再開する。   As described above, if the hot water supply heating operation is performed when the amount of remaining hot water becomes smaller than the position where the second remaining hot water temperature detecting means 23 is provided, the hot water serving as a heat source required for bath heating increases. If there is a hot water supply load greater than the increased amount, the remaining hot water amount decreases. Therefore, the third remaining hot water temperature detecting means 24 is provided at a position above the position where the first remaining hot water temperature detecting means 22 is provided. The position of the third remaining hot water temperature detecting means 24 is provided where a minimum hot water supply load can be covered. When the amount of remaining hot water becomes smaller than the position where the third remaining hot water temperature detecting means 24 is provided, the control means 25 stops the bath heating operation by stopping the use side circulation pump 10 and the heat source side circulation pump 9. . However, if hot water is stored in the hot water tank 5, the bath heating operation is resumed.

浴槽8を加熱するためには当然、風呂熱交換器6の熱源側の入口温度である貯湯槽5の貯湯温度と浴槽8の温度との温度差が重要である。しかし、貯湯槽5に貯湯した湯の温度はわずかではあるが時間と共に低下する。また、浴槽8の温度も加熱せずに放置しておけば低下するが、風呂加熱すれば比較的高温になる場合もある。だから、風呂熱交換器6の熱源側の入口温度である貯湯槽5の貯湯温度と浴槽8の温度との温度差は状況によってまちまちである。同じ貯湯温度であっても、風呂の加熱ができる場合とできない場合がある。極端な場合は、風呂加熱のつもりが浴槽8から熱を奪う場合も考えられる。逆に、比較的低い貯湯温度であっても浴槽8の温度が低ければ風呂加熱が可能な場合がある。そこで、風呂加熱の要求があった場合に、前記温度差が所定の温度差以上であれば風呂加熱運転を行い、逆に、前記温度差が所定の温度差未満であれば風呂加熱運転を停止するようにすればよい。   Of course, in order to heat the bathtub 8, the temperature difference between the hot water storage temperature of the hot water storage tank 5 and the temperature of the bathtub 8, which is the inlet temperature on the heat source side of the bath heat exchanger 6, is important. However, although the temperature of the hot water stored in the hot water storage tank 5 is slight, it decreases with time. Moreover, although the temperature of the bathtub 8 will fall if it is left without heating, it may become comparatively high temperature if it heats a bath. Therefore, the temperature difference between the hot water storage temperature of the hot water storage tank 5 and the temperature of the bathtub 8 that is the inlet temperature on the heat source side of the bath heat exchanger 6 varies depending on the situation. There are cases where the bath can be heated or not even at the same hot water storage temperature. In an extreme case, it is conceivable that the purpose of the bath heating is to take heat from the bathtub 8. On the other hand, even if the hot water storage temperature is relatively low, bath heating may be possible if the temperature of the bathtub 8 is low. Therefore, when there is a request for bath heating, if the temperature difference is equal to or greater than the predetermined temperature difference, the bath heating operation is performed. Conversely, if the temperature difference is less than the predetermined temperature difference, the bath heating operation is stopped. You just have to do it.

そこで、風呂熱交換器6の熱源側の入口温度を検出するために、貯湯槽5と風呂熱交換器6とを接続する配管に熱源側入口温度検出手段28を設ける。風呂の加熱要求がある場合に、制御手段25は熱源側循環ポンプ9と利用側循環ポンプ10とを駆動し、熱源側入
口温度検出手段28と利用側入口温度検出手段27とから風呂熱交換器6の熱源側入口温度と利用側入口温度とを計測し、その温度差を演算する。
Therefore, in order to detect the inlet temperature on the heat source side of the bath heat exchanger 6, a heat source side inlet temperature detecting means 28 is provided in a pipe connecting the hot water tank 5 and the bath heat exchanger 6. When there is a request for heating of the bath, the control means 25 drives the heat source side circulation pump 9 and the use side circulation pump 10, and the heat source side inlet temperature detection means 28 and the use side inlet temperature detection means 27 make a bath heat exchanger. 6, the heat source side inlet temperature and the use side inlet temperature are measured, and the temperature difference is calculated.

そして、この温度差が前記所定の温度差(例えば10K)以上であれば風呂加熱運転をそのまま続け、前記所定の温度差未満であれば風呂加熱運転を停止する。このような制御をすれば、貯湯槽5の湯の持っている熱量を有効に利用することができる。上記説明では、熱源側入口温度検出手段28を貯湯槽5と風呂熱交換器6とを接続する配管に設けたが、風呂熱交換器6と貯湯槽5とを接続する貯湯槽5側の接続部である熱源接続口29近傍の貯湯槽5の表面温度を検出しても同様の作用、効果を得ることができる。   And if this temperature difference is more than the said predetermined temperature difference (for example, 10K), bath heating operation will be continued as it is, and if it is less than the said predetermined temperature difference, bath heating operation will be stopped. If such control is performed, the amount of heat of the hot water in the hot water storage tank 5 can be used effectively. In the above description, the heat source side inlet temperature detection means 28 is provided in the pipe connecting the hot water tank 5 and the bath heat exchanger 6, but the connection on the hot water tank 5 side connecting the bath heat exchanger 6 and the hot water tank 5. Even if the surface temperature of the hot water tank 5 in the vicinity of the heat source connection port 29 which is a part is detected, the same action and effect can be obtained.

前述したのように、残湯量が少なくなったり、熱源側と利用側の温度差が小さくなったときに風呂加熱運転を停止する。この場合、利用者に風呂加熱運転の停止を知らせる必要がある。そこで、警報装置30を設け、風呂加熱運転を停止するときは、音声でその旨を知らせたり、警報音を出したり、又は、画面上に表示しても良い。また、この警報装置30として特別ものを設けなくても、給湯機にリモコン(図示せず)があれば、リモコンに警報機能を付加することによって、共用化することも可能である。   As described above, the bath heating operation is stopped when the amount of remaining hot water decreases or the temperature difference between the heat source side and the use side decreases. In this case, it is necessary to inform the user that the bath heating operation is stopped. Therefore, when the alarm device 30 is provided and the bath heating operation is stopped, the fact may be notified by voice, an alarm sound may be output, or displayed on the screen. Even if a special device is not provided as the alarm device 30, if the hot water heater has a remote controller (not shown), it can be shared by adding an alarm function to the remote controller.

また、給湯加熱手段13としてヒートポンプ熱源を利用するため高能力あるいは低消費電力量を実現する。   Further, since a heat pump heat source is used as the hot water supply heating means 13, high capacity or low power consumption is realized.

さらに、ヒートポンプ熱源に封入する冷媒を二酸化炭素とすることによって、貯湯槽5に高温湯(およそ90℃)を貯湯する。そのため、貯湯槽5の蓄熱量が増加して、風呂加熱運転の放熱量、運転時間が増大する。また、地球環境保全にも貢献する。   Furthermore, hot water (approximately 90 ° C.) is stored in the hot water storage tank 5 by using carbon dioxide as the refrigerant sealed in the heat pump heat source. Therefore, the heat storage amount of the hot water storage tank 5 increases, and the heat radiation amount and operation time of the bath heating operation increase. It also contributes to global environmental conservation.

以上のように、本発明にかかる給湯機は、貯湯槽の残湯量が少なくなったときには、風呂の加熱能力を減少して湯の使用量を少なくすることで、湯切れの可能性を少なくし、かつ、風呂の追い焚き運転ができない状態を少なくして、快適性と利便性の向上を図ることができるものであるので、風呂加熱に限らず、貯湯熱を利用した暖房や浴室乾燥機などの用途にも適用できる。   As described above, the hot water supply device according to the present invention reduces the possibility of running out of hot water by reducing the heating capacity of the bath and reducing the amount of hot water used when the amount of hot water remaining in the hot water storage tank decreases. In addition, since it is possible to improve the comfort and convenience by reducing the state in which the bath cannot be rerun, it is not limited to bath heating, heating using hot water stored in the hot water, bathroom dryer etc. It can be applied to other uses.

本発明の実施の形態1における給湯機の構成図Configuration diagram of a water heater in Embodiment 1 of the present invention 従来の給湯機の構成図Configuration of a conventional water heater

符号の説明Explanation of symbols

5 貯湯槽
13 給湯加熱手段
21 風呂加熱手段
22 第一の残湯温度検出手段(残湯量検出手段)
24 第三の残湯温度検出手段(残湯量検出手段)
25 制御手段
5 Hot water storage tank 13 Hot water supply heating means 21 Bath heating means 22 First remaining hot water temperature detection means (remaining hot water amount detection means)
24 Third remaining hot water temperature detecting means (remaining hot water amount detecting means)
25 Control means

Claims (9)

給湯加熱手段と、前記給湯加熱手段で加熱した温水を貯湯する貯湯槽と、前記貯湯槽から循環させる熱源側の温水と浴槽から循環させる利用側の水又は温水とが熱交換する風呂熱交換器と、前記貯湯槽に貯湯された温水を前記風呂熱交換器へ循環させる熱源側循環手段と、前記浴槽から水又は温水を前記風呂熱交換器へ循環させる利用側循環手段と、前記風呂熱交換器の熱源側出口温度を検出する熱源側出口温度検出手段と、前記風呂熱交換器の利用側入口温度を検出する利用側入口温度検出手段と、前記貯湯槽の残湯量を検出する残湯量検出手段と、前記熱源側循環手段および前記利用側循環手段の動作を制御する制御手段とを備え、前記残湯量検出手段が検出した残湯量が所定値より少ないときには多いときより、前記熱源側出口温度検出手段が検出する前記風呂熱交換器の熱源側出口温度と前記利用側入口温度検出手段が検出する前記風呂熱交換器の利用側入口温度との温度差が小さくなるように、前記熱源側循環手段の回転数を制御することを特徴とする給湯機。 Hot water supply heating means, hot water storage tank for storing hot water heated by the hot water supply heating means, hot water on the heat source side circulated from the hot water storage tank, and water on the use side or hot water circulated from the bathtub for heat exchange Heat source side circulation means for circulating hot water stored in the hot water storage tank to the bath heat exchanger, use side circulation means for circulating water or hot water from the bathtub to the bath heat exchanger, and the bath heat exchange a heat source-side outlet temperature detecting means for detecting a heat source-side outlet temperature of the vessel, the usage-side inlet temperature detecting means for detecting a usage-side inlet temperature of the bath heat exchanger, the remaining hot water detection for detecting the remaining hot water of the hot water storage tank And a control means for controlling the operation of the heat source side circulation means and the use side circulation means, and the heat source side outlet temperature is higher than when the remaining hot water amount detected by the remaining hot water amount detection means is smaller than a predetermined value. Inspection The heat source side circulation means so that the temperature difference between the heat source side outlet temperature of the bath heat exchanger detected by the means and the use side inlet temperature of the bath heat exchanger detected by the use side inlet temperature detection means becomes small A water heater characterized by controlling the number of rotations . 残湯量検出手段は、貯湯槽に設けられた前記貯湯槽の温度を検出する複数の残湯温度検出手段である請求項1記載の給湯機。 The hot water supply device according to claim 1, wherein the remaining hot water amount detecting means is a plurality of remaining hot water temperature detecting means for detecting the temperature of the hot water storage tank provided in the hot water storage tank. 風呂熱交換器の熱源側出口温度を低くするように熱源側循環手段の回転数を制御する請求項1記載の給湯機。 The water heater according to claim 1, wherein the number of revolutions of the heat source side circulation means is controlled so as to lower the heat source side outlet temperature of the bath heat exchanger. 熱源側出口温度検出手段が検出する風呂熱交換器の熱源側出口温度と利用側入口温度検出手段が検出する風呂熱交換器の利用側入口温度との温度差が小さくなるように、熱源側循環手段の回転数を制御する残湯量を第一の所定の残湯量とし、前記第一の所定の残湯量よりも多い量に設定された第二の所定の残湯量を有し、残湯量が前記第二の所定の残湯量よりも少ないときは、貯湯槽を沸き上げる給湯加熱運転を行う請求項1〜3のいずれか1項記載の給湯機。 Heat source side circulation so that the temperature difference between the heat source side outlet temperature of the bath heat exchanger detected by the heat source side outlet temperature detecting means and the user side inlet temperature of the bath heat exchanger detected by the user side inlet temperature detecting means becomes small. The amount of remaining hot water for controlling the number of revolutions of the means is set as a first predetermined remaining hot water amount, and has a second predetermined remaining hot water amount set to an amount larger than the first predetermined remaining hot water amount. The hot water supply device according to any one of claims 1 to 3 , wherein when the amount is smaller than a second predetermined remaining hot water amount, a hot water supply heating operation for boiling the hot water storage tank is performed. 熱源側出口温度検出手段が検出する風呂熱交換器の熱源側出口温度と利用側入口温度検出手段が検出する風呂熱交換器の利用側入口温度との温度差が小さくなるように、熱源側循環手段の回転数を制御する残湯量を第一の所定の残湯量とし、前記第一の所定の残湯量よりも少ない量に設定された第三の所定の残湯量を有し、残湯量が前記第三の所定の残湯量
よりも少ないときは、熱源側循環手段を停止させるように制御する請求項1〜4のいずれか1項記載の給湯機。
Heat source side circulation so that the temperature difference between the heat source side outlet temperature of the bath heat exchanger detected by the heat source side outlet temperature detecting means and the user side inlet temperature of the bath heat exchanger detected by the user side inlet temperature detecting means becomes small. The amount of remaining hot water for controlling the number of revolutions of the means is set as a first predetermined remaining hot water amount, and has a third predetermined remaining hot water amount set to an amount smaller than the first predetermined remaining hot water amount. The water heater according to any one of claims 1 to 4 , wherein when the amount is smaller than a third predetermined remaining hot water amount, the heat source side circulation means is controlled to be stopped.
風呂熱交換器の熱源側入口温度が浴槽の温度よりも所定の温度差以上高くない場合に、熱源側循環手段を停止させる請求項1〜5のいずれか1項記載の給湯機。 If the heat source side inlet temperature of the bath heat exchanger is not higher than a predetermined temperature difference than the temperature of the bath, the water heater of any one of claims 1 to 5 for stopping the heat source side circulation means. 熱源側循環手段を停止させる場合に、そのことを知らせる警報装置を備えた請求項5または6記載の給湯機。 The hot water heater according to claim 5 or 6, further comprising an alarm device for informing that the heat source side circulation means is stopped. 給湯加熱手段は、圧縮機を有するヒートポンプサイクルとする請求項1〜7のいずれか1項記載の給湯機。 The hot water heater according to any one of claims 1 to 7 , wherein the hot water heater is a heat pump cycle having a compressor. ヒートポンプサイクルに封入する冷媒を二酸化炭素とする請求項8記載の給湯機。 The water heater according to claim 8, wherein the refrigerant sealed in the heat pump cycle is carbon dioxide.
JP2004214024A 2004-07-22 2004-07-22 Water heater Active JP3931894B2 (en)

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