JP2007057168A - Hot water storage type water heater - Google Patents

Hot water storage type water heater Download PDF

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JP2007057168A
JP2007057168A JP2005243988A JP2005243988A JP2007057168A JP 2007057168 A JP2007057168 A JP 2007057168A JP 2005243988 A JP2005243988 A JP 2005243988A JP 2005243988 A JP2005243988 A JP 2005243988A JP 2007057168 A JP2007057168 A JP 2007057168A
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hot water
heat pump
water storage
heat
storage type
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JP4619239B2 (en
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Yoshihiko Maekawa
善彦 前川
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Hanshin Electric Co Ltd
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Hanshin Electric Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type water heater capable of accurately detecting degradation of heating capacity of a heat pump in association with a secular change or the like. <P>SOLUTION: The hot water storage type water heater including a heat pump of a power operation type in a heat pump unit 2 which heats water flowing in a circulation circuit 20 for delivering water on a lower part in the hot water storage tank 1 to an upper part in the hot water storage tank 1 to make high temperature hot water, is provided with a calculation means for calculating an effective output heat quantity of the heat pump which is a sum of an increased heat quantity which increases after a boiling instruction is made to the heat pump and a reduced heat quantity which is reduced by discharge of hot water during boiling arranged in a control device 3. When the heat pump effective output heat quantity calculated by the calculation means, does not reach a predetermined heat quantity within a predetermined period after the boiling instruction is made to the heat pump, it is determined that heating capacity of the heat pump is degraded, and a target boiling temperature when the boiling instruction is made to the heat pump is corrected to be high. Furthermore, when a difference between the heat pump effective output heat quantity and the predetermined heat quantity exceeds a predetermined threshold, that is notified to a user through display means 53, 55. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、電力によってヒートポンプを稼動させ、制御装置により指令された目標蓄熱量になるまで給水を加熱して貯湯タンク内に貯め置く貯湯式給湯装置に関し、特に、当該ヒートポンプの加熱能力低下を精度良く検出し、利用者に報知できるようにした貯湯式給湯装置に関する。   The present invention relates to a hot water storage hot water supply apparatus that operates a heat pump with electric power and heats the water supply until it reaches a target heat storage amount commanded by the control device and stores it in a hot water storage tank, and in particular, accurately reduces the heating capacity of the heat pump. The present invention relates to a hot water storage type hot water supply apparatus that can detect well and notify a user.

従来から、電力稼動のヒートポンプで加熱した高温の湯を貯湯タンク内に貯える貯湯式給湯装置がある。特にこのタイプの給湯装置として、貯湯タンク内の最下部の水をヒートポンプにより加熱し、高温の湯として貯湯タンク内の最上部に送ることで、温度の異なる水の比重差を利用し、貯湯タンク内の上部側に高温の湯を貯え、貯湯タンク内の下部側の水と混合しないようにしているものが知られている。また、貯湯タンク内の湯を出力する(例えば、蛇口等を開き貯湯タンク外で湯を消費する)場合には、貯湯タンクの最上部に接続した出湯配管から給湯し、貯湯タンクの最下部に接続した給水配管から貯湯タンク内に水を供給するようになっている。最近ではさらに、一般に暖房熱源としての機能も有しているのが普通である他、浴槽内に注湯もでき、また、使用者の好みの設定温度で注湯した湯が浴槽内で冷めた時、貯湯タンク内の湯に熱結合した追い焚き用熱交換器を介して浴槽内の湯を循環させ、追い焚きも可能なものもある。   2. Description of the Related Art Conventionally, there is a hot water storage type hot water supply device that stores high temperature hot water heated by an electric power operated heat pump in a hot water storage tank. In particular, as this type of hot water supply device, the bottom water in the hot water storage tank is heated by a heat pump and sent as hot water to the top of the hot water storage tank, making use of the difference in specific gravity of water at different temperatures. It is known that hot water is stored on the upper side of the inside so as not to mix with the water on the lower side in the hot water storage tank. When the hot water in the hot water storage tank is output (for example, the tap is opened and the hot water is consumed outside the hot water storage tank), hot water is supplied from the hot water outlet pipe connected to the uppermost part of the hot water storage tank. Water is supplied into the hot water storage tank from the connected water supply pipe. Recently, it is also common to have a function as a heating heat source. In addition, hot water can be poured into the bathtub, and hot water poured at the set temperature of the user's preference has cooled in the bathtub. Sometimes, the hot water in the bathtub is circulated through a heat exchanger for reheating that is thermally coupled to the hot water in the hot water storage tank, and reheating is also possible.

しかるに、こうした貯湯式給湯装置において重要な要因の一つに、ヒートポンプの加熱能力監視がある。経年的にその能力が低下して行くとするならば、少なくとも無駄な電力消費を招くことのないよう、使用者にメンテナンス要請の報知をなすためにもこうした加熱能力の判定は必要である。そこで従来からも、こうした観点に立ち、下記特許文献1に認められるように、装置起動後から最大限の制御能力で稼働しても、所定時間が経過するまでに貯湯タンク最上部の温度にあたるヒートポンプ吐出温度が所定温度に達しない場合にはヒートポンプ系統が故障していると判定するものがあった。
特開2002−213816号公報
However, one of the important factors in such a hot water storage type hot water supply apparatus is the heating capacity monitoring of the heat pump. If the capacity is reduced with time, it is necessary to determine the heating capacity in order to notify the user of a maintenance request so as not to cause unnecessary power consumption. Therefore, in the past, from the above viewpoint, as recognized in the following Patent Document 1, even if the apparatus is operated with the maximum control ability after starting the apparatus, the heat pump reaches the temperature at the top of the hot water storage tank until a predetermined time elapses Some have determined that the heat pump system has failed when the discharge temperature does not reach the predetermined temperature.
JP 2002-213816

しかし、この方法では、単純に温度上昇のみによる判定のため、精度が余り良くない上に、沸き上げ中に出湯を行うとそもそも正しい判定ができないという欠点があった。   However, this method has a drawback that accuracy is not so good because the determination is simply based on the temperature rise, and correct determination cannot be made in the first place when tapping hot water during boiling.

本発明はこの点に鑑み、ヒートポンプの加熱能力低下を精度良く検出し得る貯湯式給湯装置を提供せんとする。精度の良い検出ができれば、例えばヒートポンプの寿命期間を全うするまで、貯湯量不足等に起因する使用者の不快感を招かないようにしながら、なるべくヒートポンプを使い続けるような制御や、最終的にこれ以上使い続けると許容できない大きな電力損失となるとか、最早快適性は保持できないと判断せざるを得ない状況になったときに使用者にその旨報知する際にも、誤動作やご判断を招かないで済む。   In view of this point, the present invention is intended to provide a hot water storage type hot water supply apparatus that can accurately detect a reduction in heating capacity of a heat pump. If accurate detection is possible, for example, control that keeps using the heat pump as much as possible while avoiding user discomfort due to insufficient hot water storage, etc. until the life of the heat pump is completed. Do not inadvertently cause malfunctions or judgments when notifying the user of a situation where it is necessary to judge that the power loss will be unacceptable if the user continues to use the product or the comfort cannot be maintained. That's it.

本発明は上記目的を達成するために、
ヒートポンプへの沸き上げ指示を行った後の沸き上げにより増加して行く増加熱量と、沸き上げ中の出湯により減少して行く減少熱量との和としてヒートポンプの実効出力熱量を算出する算出手段と;
ヒートポンプへの沸き上げ指示後の所定期間内にこの算出手段が算出するヒートポンプ実効出力熱量が予め定めた熱量に到達しなかった場合、ヒートポンプの加熱能力低下と判断する判断手段と;
を有することを特徴とする貯湯式給湯装置を提案する。
In order to achieve the above object, the present invention
A calculating means for calculating an effective output heat amount of the heat pump as a sum of an increased heat amount that is increased by boiling after giving a boiling instruction to the heat pump and a reduced heat amount that is decreased by tapping during boiling;
Determining means for determining that the heat pump effective output heat quantity calculated by the calculating means does not reach a predetermined heat quantity within a predetermined period after the heating pump is instructed to be heated;
The hot water storage type hot water supply apparatus characterized by having is proposed.

本発明はさらに、上記構成要件を満足した上での特定の態様として、判断手段がヒートポンプの加熱能力低下と判断したとき以降は、ヒートポンプへの沸き上げ指示の際の目標沸き上げ温度を高めに補正することを特徴とする貯湯式給湯装置も提案する。   The present invention further provides a specific mode after satisfying the above-described structural requirements, and after the determination means determines that the heat capacity of the heat pump has been reduced, the target boiling temperature at the time of instructing the heating to the heat pump is increased. A hot water storage type hot water supply device characterized by correction is also proposed.

さらに、本発明のまた別な態様においては、算出手段が算出したヒートポンプ実効出力熱量と予め定めた熱量との差が所定の閾値を超えて大きくなった場合には、判断手段が加熱能力の著しい低下と判断して報知手段を稼働させ、利用者に対し、主としてメンテナンス要請のための報知を行うように構成した貯湯式給湯装置も提案する。   Furthermore, in another aspect of the present invention, when the difference between the heat pump effective output heat amount calculated by the calculation means and the predetermined heat amount exceeds a predetermined threshold value, the determination means has a remarkable heating capability. A hot water storage type hot water supply apparatus is also proposed in which the notification means is activated based on the determination that the battery has fallen, and the user is mainly notified for a maintenance request.

本発明によると、出湯により熱量が消費された分も含めての実効的な増加熱量にて加熱能力の判定を行うため、出湯量の使用状況に影響されることはなく、ヒートポンプの加熱能力低下を正確に検出できる。そのため、ヒートポンプを使用者に不快感を与えることなく使い続けるにも間違いのない制御がなし得るし、最終的に寿命と判断し、利用者へメンテナンスの必要性を伝達するにも、その正確性を期することができる。なお、この際に用いられる報知手段は、可視的なものでも可聴的なものでも、その双方であっても良く、それは機器の操作盤等に設置して置けば良い。   According to the present invention, since the heating capacity is determined based on the effective increased heat amount including the amount of heat consumed by the tapping water, the heating capacity of the heat pump is reduced without being affected by the usage status of the tapping volume. Can be detected accurately. As a result, it is possible to control the heat pump without causing any discomfort to the user, and there is no doubt that it will be possible to control the accuracy of the heat pump. Can be expected. Note that the notification means used at this time may be visible, audible, or both, and may be placed on an operation panel or the like of the device.

図1には本発明を適用可能な貯湯式給湯装置の一構成例が示されている。貯湯タンク1は通常、耐食性に優れた金属製(例えばステンレス製)で、外周部に図示しない断熱材が配置され、高温の給湯用水を長時間に亘って保温可能となっている。形状は一般に縦長形状であり、その底面には導入口11が設けられ、この導入口11には貯湯タンク1内の最下部に給水(一般に水道水)Wfを導入するための給水配管12が接続されている。   FIG. 1 shows a configuration example of a hot water storage type hot water supply apparatus to which the present invention can be applied. The hot water storage tank 1 is usually made of metal having excellent corrosion resistance (for example, made of stainless steel), and a heat insulating material (not shown) is arranged on the outer peripheral portion, so that hot water for hot water supply can be kept warm for a long time. The shape is generally vertically long, and an inlet 11 is provided on the bottom surface. A water supply pipe 12 for introducing water supply (generally tap water) Wf is connected to the inlet 11 at the bottom of the hot water storage tank 1. Has been.

給水配管12には給水温度検出手段である給水サーミスタ21が設けられており、給水配管12内の温度情報を制御装置3に出力するようになっている。そして、給水配管12の途中で給水サーミスタ21が設けられた位置より下流側には給水配管12を分岐して後述する混合弁16に接続するバイパス配管15が接続している。   The water supply pipe 12 is provided with a water supply thermistor 21 which is a water supply temperature detection means, and outputs temperature information in the water supply pipe 12 to the control device 3. A bypass pipe 15 that branches from the position where the water supply thermistor 21 is provided in the middle of the water supply pipe 12 and connects to the mixing valve 16 described later is connected to the downstream side.

貯湯タンク1の最上部には導出口13が設けられ、この導出口13には貯湯タンク1内の湯を導出するための給湯経路である導出管14が接続されている。そして、この経路途中に設けられている混合弁16は、開口面積比を調節することにより、導出管14からの湯とバイパス配管15から供給される水道水Wfとの混合比を調節できるようになっている。一般にこの混合弁16はサーボモータ等の駆動源(図示せず)により弁体を駆動して各経路の開度を調節する電動弁であり、制御装置3からの制御信号により作動すると共に、作動状態を制御装置3に帰還するようにもなっている。   A lead-out port 13 is provided at the uppermost part of the hot water storage tank 1, and a lead-out pipe 14, which is a hot water supply path for leading the hot water in the hot water storage tank 1, is connected to the lead-out port 13. The mixing valve 16 provided in the middle of the path can adjust the mixing ratio between the hot water from the outlet pipe 14 and the tap water Wf supplied from the bypass pipe 15 by adjusting the opening area ratio. It has become. In general, the mixing valve 16 is an electric valve that adjusts the opening degree of each path by driving a valve body by a drive source (not shown) such as a servomotor, and is operated by a control signal from the control device 3. The state is also returned to the control device 3.

混合弁16の出口側には蛇口、シャワー、風呂等の出湯口43への混合湯経路である出湯配管17が接続し、この配管17には出湯温度検出手段である出湯サーミスタ41と出湯量検出手段である流量カウンタ42が設けられており、出湯サーミスタ41は配管17内の温度情報を、流量カウンタ42は配管17内の流量情報を制御装置3に出力するようになっている。   The outlet side of the mixing valve 16 is connected to a tap hot water pipe 17 which is a mixed hot water path to the hot water outlet 43 of a faucet, a shower, a bath, etc., and the hot water thermistor 41 which is a hot water temperature detecting means and the amount of hot water detected are connected to this pipe 17. A flow rate counter 42 as means is provided, and the hot water thermistor 41 outputs temperature information in the pipe 17, and the flow rate counter 42 outputs information on the flow rate in the pipe 17 to the control device 3.

貯湯タンク1の下部には、貯湯タンク1内の最下部の水を吸入するための吸入口18が設けられ、貯湯タンク1の上部側には貯湯タンク1内の最上部に向けて湯を吐出するための吐出口19が設けられている。吸入口18と吐出口19とは循環回路20で接続されており、この循環回路20の一部は制御装置3により制御されるヒートポンプユニット2内に配置されている。   The lower part of the hot water storage tank 1 is provided with a suction port 18 for sucking the lowermost water in the hot water storage tank 1, and the hot water is discharged toward the uppermost part of the hot water storage tank 1 toward the uppermost part of the hot water storage tank 1. A discharge port 19 is provided for this purpose. The suction port 18 and the discharge port 19 are connected by a circulation circuit 20, and a part of the circulation circuit 20 is disposed in the heat pump unit 2 controlled by the control device 3.

循環回路20のヒートポンプユニット2内に配置された実質的なヒートポンプ部分には図示しない熱交換器が設けられており、吸入口18から吸入した貯湯タンク1内の水を望ましくは高温の二酸化炭素冷媒との熱交換により加熱し、吐出口19から貯湯タンク1内に戻すことにより、貯湯タンク1内の水を沸き上げるようになっている。ヒートポンプの冷媒に二酸化炭素を採用すると、超臨界域を用いることで図示しない電力稼動型圧縮機からの冷媒吐出温度を高くすることができるので、フロン冷媒等を採用した場合よりも高温の湯を効率良く沸き上げることができる。なお、ヒートポンプにより加熱された湯は、バイパス三方弁23を介し、必要に応じては吸入口18側にも湯を戻せるようになっている。   A substantial heat pump portion disposed in the heat pump unit 2 of the circulation circuit 20 is provided with a heat exchanger (not shown), and the water in the hot water storage tank 1 sucked from the suction port 18 is desirably high-temperature carbon dioxide refrigerant. The water in the hot water storage tank 1 is boiled by being heated by heat exchange with the water and returning to the hot water storage tank 1 from the discharge port 19. When carbon dioxide is used as the refrigerant for the heat pump, it is possible to increase the refrigerant discharge temperature from a power-operated compressor (not shown) by using the supercritical region. Boil up efficiently. The hot water heated by the heat pump can be returned to the suction port 18 side as needed via the bypass three-way valve 23.

貯湯タンク1の外壁面には複数の(本実施形態では六つの)水位サーミスタ31〜36が縦方向(貯湯タンク1の高さ方向)にほぼ等間隔に配置され、貯湯タンク1内に満たされた水の各水位レベルでの温度情報を制御装置3に出力するようになっている。従って制御装置3は、各水位サーミスタからの温度情報に基づき、貯湯タンク1内上方の沸き上げられた湯と貯湯タンク1内下方の沸き上げられる前の水との境界位置も検出できる。   A plurality of (six in this embodiment) water level thermistors 31 to 36 are arranged on the outer wall surface of the hot water storage tank 1 at substantially equal intervals in the vertical direction (the height direction of the hot water storage tank 1), and are filled in the hot water storage tank 1. The temperature information at each water level is output to the control device 3. Therefore, the control device 3 can also detect the boundary position between the hot water heated in the upper part of the hot water tank 1 and the water before being heated in the lower part of the hot water tank 1 based on the temperature information from each water level thermistor.

もちろん、貯湯タンク1の最上部外壁面に設けられている水位サーミスタ31は、導出口13から外部に向けて吸入される湯の温度である貯湯タンク1内最上部の水温を検出するタンク出力湯温サーミスタの機能も有している。   Of course, the water level thermistor 31 provided on the uppermost outer wall surface of the hot water storage tank 1 is a tank output hot water that detects the uppermost water temperature in the hot water storage tank 1 that is the temperature of the hot water drawn from the outlet 13 to the outside. It also has the function of a warm thermistor.

一般にはこの他、暖房用の配管系等も接続されるが、本発明には直接の関係はないためにこれらは省略する。   Generally, in addition to this, a piping system for heating and the like is also connected, but these are omitted because they are not directly related to the present invention.

制御装置3は、これまで述べてきた各サーミスタや流量カウンタ42からの出湯流量情報に加え、ヒートポンプユニット2等に備えられている外気温検出手段である外気温サーミスタ22からの情報を受け、また、台所とか風呂場内に設けられたリモートコントローラユニット(図中では台所リモコン52,風呂リモコン54と表示)等の操作盤に設けられた操作スイッチからの信号等に基づいて、ヒートポンプユニット2や混合弁16を制御するように構成されている。   The control device 3 receives information from the outside air temperature thermistor 22 which is an outside air temperature detecting means provided in the heat pump unit 2 and the like in addition to the hot water flow rate information from each thermistor and the flow rate counter 42 described so far. The heat pump unit 2 and the mixing valve are based on signals from operation switches provided on the operation panel of a remote controller unit (shown as kitchen remote control 52 and bath remote control 54 in the figure) provided in the kitchen or bathroom. 16 is configured to control.

さて、給湯装置の図示しない電源スイッチがオンにされている場合には、制御装置3は貯湯タンク1に設けられた各サーミスタからの温度情報等や、図示しない操作盤により設定された時刻情報等に基づいて、適宜にヒートポンプユニット2を作動させ、貯湯タンク1内の水を加熱して高温の湯(例えば90℃の湯)まで沸き上げる。ヒートポンプユニット2等、適当な箇所には、上述のように外気の温度を検出する外気温サーミスタ22も設けられており、季節によっては気温低下による循環回路20の凍結を防止すべく、上述のバイパス三方弁23を吸入口18側に切り換えることで、ヒートポンプを駆動し、凍結防止運転を行うこともできる。   When the power switch (not shown) of the hot water supply device is turned on, the control device 3 detects temperature information from each thermistor provided in the hot water storage tank 1, time information set by an operation panel (not shown), etc. Based on the above, the heat pump unit 2 is appropriately operated to heat the water in the hot water storage tank 1 and boil it up to high temperature hot water (for example, 90 ° C. hot water). As described above, the outside temperature thermistor 22 for detecting the temperature of the outside air is also provided at an appropriate location such as the heat pump unit 2, and the above bypass is used to prevent the circulation circuit 20 from freezing due to a temperature drop depending on the season. By switching the three-way valve 23 to the suction port 18 side, the heat pump can be driven to perform the freeze prevention operation.

また、流量カウンタ42が出湯配管17内の水(湯)の流れを検出したときには、出湯口43を介して使用者が湯が使用したと言うことである。そこでこのとき、制御装置3はそのときの設定温度に応じ、給水サーミスタ21、水位サーミスタ31および出湯サーミスタ41からの温度情報に基づき、混合弁16の開口面積比制御を行なって、設定温度になるべく近い温度の湯が出湯されるように図る。すなわち、設定温度が水位サーミスタ31の検出温度以下である場合には、制御装置3は、まず混合弁16をバイパス配管15と配管17とを連通状態とすると共に配管14方向を遮断状態とし、次に給水サーミスタ21の検出温度と水位サーミスタ31の検出温度とから混合弁16の開口面積比を概略調節し、その後出湯サーミスタ41からの温度情報に基づいて給湯温度が設定温度となるように混合弁16の開口面積比を微細に制御する。   Further, when the flow rate counter 42 detects the flow of water (hot water) in the hot water supply pipe 17, it means that the user has used hot water through the hot water outlet 43. Therefore, at this time, the control device 3 controls the opening area ratio of the mixing valve 16 based on the temperature information from the water supply thermistor 21, the water level thermistor 31, and the hot water thermistor 41 according to the set temperature at that time, so that the set temperature is reached. Try to get hot water at a near temperature. That is, when the set temperature is equal to or lower than the detected temperature of the water level thermistor 31, the control device 3 first sets the mixing valve 16 in the communication state between the bypass pipe 15 and the pipe 17 and shuts off the direction of the pipe 14 and then The ratio of the opening area of the mixing valve 16 is roughly adjusted from the detected temperature of the water supply thermistor 21 and the detected temperature of the water level thermistor 31, and then the mixing valve is set so that the hot water supply temperature becomes the set temperature based on the temperature information from the hot water thermistor 41. The aperture area ratio of 16 is finely controlled.

上述したヒートポンプへの沸き上げ指示は、原則としては電力料金設定が低い深夜時間帯の所定の時刻等になされる。但しもちろん、一般に湯切れを防止するために最低貯湯量が設定されており、深夜時間帯以外の時間帯においても湯量に不足を来した場合には沸き上げが開始される。   The above-described heating instruction to the heat pump is, as a general rule, given at a predetermined time in the midnight time zone when the power rate setting is low. However, of course, a minimum hot water storage amount is generally set in order to prevent running out of hot water, and boiling is started when the hot water amount is insufficient even in a time zone other than the midnight time zone.

しかるに、本発明の貯湯式給湯装置では、ヒートポンプへの沸き上げ指示が出されて制御が開始されると、制御装置3内に設けられている図示しない算出手段が沸き上げにより増加される熱量を随時算出する。この増加熱量の算出には、サーミスタ31〜36からの温度情報から得られる現在の有効貯湯量、タンク内平均温度を用いて、
熱量Q = 有効貯湯量 × 比重 × (タンク内平均温度 − 給水温度)
なる式が用いられる。この実施形態の場合、給水温度は給水サーミスタ21にて検出される水の温度となる。従って、経時的に沸き上げにより増加した増加熱量Qiは、現在の熱量Qeから沸き上げ開始時の熱量Qsを減算することにより求まる。算出手段は実質的には昨今では制御装置3内に組み込まれるマイクロコンピュータにより構成することができる。
However, in the hot water storage type hot water supply apparatus of the present invention, when a heating instruction is given to the heat pump and control is started, a calculation means (not shown) provided in the control device 3 increases the amount of heat increased by boiling. Calculate from time to time. For the calculation of this increased heat amount, the current effective hot water storage amount obtained from the temperature information from the thermistors 31 to 36, the average temperature in the tank,
Quantity of heat Q = Effective amount of stored hot water x Specific gravity x (Average tank temperature-Feed water temperature)
The following formula is used. In this embodiment, the water supply temperature is the temperature of water detected by the water supply thermistor 21. Therefore, the increased amount of heat Qi increased by boiling over time is obtained by subtracting the amount of heat Qs at the start of boiling from the current amount of heat Qe. The calculation means can be substantially constituted by a microcomputer incorporated in the control device 3 in recent years.

一方、沸き上げ実行中に出湯が行われて湯量の減少があった場合、制御装置3内の算出手段はこの減少熱量をも随時算出する。この減少熱量Qdの算出には、
熱量Qd = 使用湯量 × 比重 × (出湯温度 − 給水温度)
なる式を用いる。
On the other hand, when the hot water is discharged during the boiling operation and the amount of hot water is reduced, the calculation means in the control device 3 also calculates this reduced heat amount as needed. To calculate this reduced heat quantity Qd,
Quantity of heat Qd = Hot water used x Specific gravity x (Tempered water temperature-Feed water temperature)
The following formula is used.

このことから、算出手段により求められる、ヒートポンプが実際に熱エネルギを与えて加熱した実効出力熱量Qaは増加分、減少分の両者の和であるQi+Qdとなり、ヒートポンプによる沸き上げが所定時間以上に亘り連続で実行された際に、制御装置3内に設けられた図示しない判断手段は沸き上げ開始時から所定時間後に増加したこの実効出力熱量Qaが予め定めておいた所定の熱量Qtに達しない場合、ヒートポンプの加熱能力が低下していると判断する。   From this, the effective output heat quantity Qa, which is obtained by the calculation means and is actually heated by the heat pump, is Qi + Qd, which is the sum of both the increment and decrement, and boiling by the heat pump is over a predetermined time. When continuously executed, a judgment means (not shown) provided in the control device 3 is used when the effective output heat quantity Qa increased after a predetermined time from the start of boiling does not reach a predetermined predetermined heat quantity Qt. It is determined that the heating capacity of the heat pump is reduced.

判断手段はこれも昨今では制御装置3内に組み込まれるマイクロコンピュータにより構成することができるが、判断手段がヒートポンプの加熱能力低下と判断したとき以降は、例えば制御装置3がヒートポンプへの沸き上げ指示の際の目標沸き上げ温度を高めに補正するように構成できる。このようにすれば、ヒートポンプの寿命期間中、貯湯量不足等を来して使用者に不快感を与えるようなこともなく、そのまま使い続けられる。   The determination means can also be constituted by a microcomputer incorporated in the control device 3 recently. However, after the determination means determines that the heating capacity of the heat pump is reduced, for example, the control device 3 instructs the heat pump to boil up. In this case, the target boiling temperature can be corrected to be higher. In this way, the heat pump can be used as it is during the life of the heat pump without causing the user to feel uncomfortable due to insufficient hot water storage.

さらに望ましくは、算出手段が算出したヒートポンプ実効出力熱量と予め定めた熱量との差Qt-Qaが所定の閾値Δdを超えて大きくなった場合には、判断手段が加熱能力の著しい低下と判断し、利用者に対し、主としてメンテナンス要請のための報知を行うように構成することができる。   More preferably, if the difference Qt-Qa between the heat pump effective output calorie calculated by the calculating means and the predetermined heat quantity exceeds a predetermined threshold Δd, the judging means judges that the heating capacity is significantly reduced. It can be configured to notify the user mainly for a maintenance request.

このための報知手段には、適当な箇所に設けられている操作盤等に付属の表示装置、例えば上述した台所リモコン52に付属の表示装置53とか風呂リモコン54に付属の表示装置55等を利用でき、ここにその旨の報知をなすように構成できる。表示装置は可視表示装置でも可聴表示装置でも良いし、その双方であっても良い。   As a notification means for this purpose, a display device attached to an operation panel or the like provided at an appropriate place, for example, the display device 53 attached to the kitchen remote control 52 or the display device 55 attached to the bath remote control 54 is used. It can be configured so that a notification to that effect is made here. The display device may be a visual display device, an audible display device, or both.

このように、本発明によると、沸き上げ実行中に消費された熱量Qdがある場合には、現在の熱量Qeに加算してヒートポンプの実効出力熱量Qaを求め、それが所定の熱量Qtに到達したか否かでヒートポンプ能力の判定を行うため、温度補正制御を行うにも湯量の使用状況に影響された誤判定に基づくことない。また、最終的に報知手段を稼働させるように組んだ場合にも、報知をなすか否かの判断基準を間違えることがない。   As described above, according to the present invention, when there is a heat quantity Qd consumed during boiling, the effective output heat quantity Qa of the heat pump is obtained by adding to the current heat quantity Qe, and reaches the predetermined heat quantity Qt. Since the determination of the heat pump capacity is performed based on whether or not it is performed, the temperature correction control is not based on an erroneous determination that is influenced by the use amount of the hot water. Further, even when the notification means is finally operated, there is no mistake in the criteria for determining whether or not to notify.

なお、上述の実施形態では、簡便のため、湯の使用を出湯口43からの出湯にのみ纏めているが、台所での給湯と風呂での湯張りに分けて熱量算出を行ってもよい。さらに、最終的にヒートポンプが最早使用不能と判断される時の報知だけではなく、目標沸き上げ温度を高めに補正しての、ある意味では通常の動作中においても、その旨、使用者に報知するようにしても良い。   In the above-described embodiment, for the sake of simplicity, the use of hot water is summarized only for the hot water from the hot water outlet 43, but the calorific value may be calculated separately for hot water supply in the kitchen and hot water filling in the bath. In addition, not only when the heat pump is finally determined to be unusable, but also when the target boiling temperature is corrected to a higher level, in a sense during normal operation, the user is notified accordingly. You may make it do.

本発明に係る貯湯式給湯装置の一実施形態の概略構成図である。It is a schematic block diagram of one Embodiment of the hot water storage type hot water supply apparatus which concerns on this invention.

符号の説明Explanation of symbols

1 貯湯タンク
2 ヒートポンプユニット
3 制御装置
11 導入口
12 給水配管
13 導出口
14 導出管
15 バイパス配管
16 混合弁
17 注湯配管
18 吸入口
19 吐出口
20 循環回路
21 給水サーミスタ
22 外気温サーミスタ
23 バイパス三方弁
31〜36 水位サーミスタ
41 出湯サーミスタ
42 流量カウンタ
43 出湯口
1 Hot water storage tank 2 Heat pump unit 3 Control device
11 Introduction
12 Water supply piping
13 Outlet
14 Outlet tube
15 Bypass piping
16 Mixing valve
17 Pouring pipe
18 Suction port
19 Discharge port
20 Circulation circuit
21 Water supply thermistor
22 outside temperature thermistor
23 Bypass 3-way valve
31-36 Water level thermistor
41 Hot spring thermistor
42 Flow counter
43 Hot Spring

Claims (3)

貯湯タンク内の下部の水を該貯湯タンク内の上部に送る循環回路内を流れる水を加熱して高温の湯とする電力稼働型のヒートポンプを有する貯湯式給湯装置において;
該ヒートポンプへの沸き上げ指示を行った後に増加して行く増加熱量と、沸き上げ中の出湯により減少して行く減少熱量との和として該ヒートポンプの実効出力熱量を算出する算出手段と;
該ヒートポンプへの沸き上げ指示後の所定期間内に該算出手段が算出する該ヒートポンプ実効出力熱量が予め定めた熱量に到達しなかった場合、該ヒートポンプの加熱能力低下と判断する判断手段と;
を有することを特徴とする貯湯式給湯装置。
In a hot water storage type hot water supply apparatus having an electric power operation type heat pump that heats water flowing in a circulation circuit that sends water in the lower part of the hot water storage tank to the upper part of the hot water storage tank to produce hot water;
Calculating means for calculating an effective output heat amount of the heat pump as a sum of an increased heat amount that increases after the boiling instruction to the heat pump and a reduced heat amount that decreases due to the tapping hot water;
Determining means for determining that the heat pump effective output heat amount calculated by the calculating means does not reach a predetermined heat amount within a predetermined period after the heating pump is instructed to be heated;
A hot water storage type hot water supply apparatus characterized by comprising:
請求項1に記載の貯湯式給湯装置であって、
上記判断手段が上記ヒートポンプの加熱能力低下と判断したとき以降は、該ヒートポンプへの沸き上げ指示の際の目標沸き上げ温度を高めに補正すること;
を特徴とする貯湯式給湯装置。
The hot water storage type hot water supply device according to claim 1,
After the determination means determines that the heating capacity of the heat pump is reduced, the target boiling temperature at the time of the heating instruction to the heat pump is corrected to be higher;
Hot water storage type hot water supply device characterized by
請求項1に記載の貯湯式給湯装置であって、
上記算出手段が算出した上記ヒートポンプ実効出力熱量と上記予め定めた熱量との差が所定の閾値を超えて大きくなった場合には、上記判断手段が上記加熱能力の著しい低下と判断し、その旨を報知する報知手段を稼働させるようにしたこと;
を特徴とする貯湯式給湯装置。
The hot water storage type hot water supply device according to claim 1,
When the difference between the heat pump effective output heat calculated by the calculation means and the predetermined heat quantity exceeds a predetermined threshold value, the determination means determines that the heating capacity is significantly reduced, and accordingly That the notification means for notifying is activated;
Hot water storage type hot water supply device characterized by
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009047334A (en) * 2007-08-17 2009-03-05 Corona Corp Heat pump type water heater
JP2009264594A (en) * 2008-03-31 2009-11-12 Osaka Gas Co Ltd Hot water supply device
JP2011002139A (en) * 2009-06-18 2011-01-06 Corona Corp Heat pump type water heater
JP2021076341A (en) * 2019-11-13 2021-05-20 三菱電機株式会社 Storage type water heater

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JPS643459A (en) * 1987-06-23 1989-01-09 Mitsubishi Electric Corp Heat pump hot water feeding apparatus
JPH01167552A (en) * 1987-12-23 1989-07-03 Mitsubishi Electric Corp Heat pump hot water feeder
JP2004116942A (en) * 2002-09-27 2004-04-15 Matsushita Electric Ind Co Ltd Heat pump type water heater
JP2004116891A (en) * 2002-09-26 2004-04-15 Daikin Ind Ltd Heat pump type hot water supply machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS643459A (en) * 1987-06-23 1989-01-09 Mitsubishi Electric Corp Heat pump hot water feeding apparatus
JPH01167552A (en) * 1987-12-23 1989-07-03 Mitsubishi Electric Corp Heat pump hot water feeder
JP2004116891A (en) * 2002-09-26 2004-04-15 Daikin Ind Ltd Heat pump type hot water supply machine
JP2004116942A (en) * 2002-09-27 2004-04-15 Matsushita Electric Ind Co Ltd Heat pump type water heater

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009047334A (en) * 2007-08-17 2009-03-05 Corona Corp Heat pump type water heater
JP2009264594A (en) * 2008-03-31 2009-11-12 Osaka Gas Co Ltd Hot water supply device
JP2011002139A (en) * 2009-06-18 2011-01-06 Corona Corp Heat pump type water heater
JP2021076341A (en) * 2019-11-13 2021-05-20 三菱電機株式会社 Storage type water heater
JP7268583B2 (en) 2019-11-13 2023-05-08 三菱電機株式会社 Storage hot water heater

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