JPS60205149A - Heat pump type water heater - Google Patents
Heat pump type water heaterInfo
- Publication number
- JPS60205149A JPS60205149A JP59064567A JP6456784A JPS60205149A JP S60205149 A JPS60205149 A JP S60205149A JP 59064567 A JP59064567 A JP 59064567A JP 6456784 A JP6456784 A JP 6456784A JP S60205149 A JPS60205149 A JP S60205149A
- Authority
- JP
- Japan
- Prior art keywords
- heat pump
- pump cycle
- electric heater
- temperature
- hot water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 238000010438 heat treatment Methods 0.000 claims abstract description 41
- 230000003111 delayed effect Effects 0.000 claims abstract description 10
- 230000005611 electricity Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 28
- 238000009835 boiling Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 7
- 230000017525 heat dissipation Effects 0.000 description 2
- 206010028813 Nausea Diseases 0.000 description 1
- 241000270666 Testudines Species 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 210000004251 human milk Anatomy 0.000 description 1
- 235000020256 human milk Nutrition 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008693 nausea Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
- F24D19/1054—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water the system uses a heat pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/156—Reducing the quantity of energy consumed; Increasing efficiency
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/16—Reducing cost using the price of energy, e.g. choosing or switching between different energy sources
- F24H15/164—Reducing cost using the price of energy, e.g. choosing or switching between different energy sources where the price of the electric supply changes with time
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/174—Supplying heated water with desired temperature or desired range of temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
- F24H15/223—Temperature of the water in the water storage tank
- F24H15/225—Temperature of the water in the water storage tank at different heights of the tank
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/258—Outdoor temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/355—Control of heat-generating means in heaters
- F24H15/37—Control of heat-generating means in heaters of electric heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/375—Control of heat pumps
- F24H15/38—Control of compressors of heat pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/40—Control of fluid heaters characterised by the type of controllers
- F24H15/486—Control of fluid heaters characterised by the type of controllers using timers
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
Description
く技術分野〉
本発明は、深夜電力でもって運転されるヒートポンプサ
イクル及び補助加熱源としての電気ヒータを併設して成
るヒートポンプ式温水器に関し、特にこのヒートポンプ
サイクル及び電気ヒータの運転制御に係る。
〈従来技術〉
ヒートポンプ式温水器では、大気の熱を奪い温水を作る
ため、加温能力は、外気温の影響を太き（受けることに
なる。即ち、第１図に示すごとくヒートポンプの加温能
力は、外気温の上昇とともに増加するが、給湯負荷は一
般に減少する。従って、外気温の低いところでは、ヒー
トポンプだけでは電力不足となって補助加熱源が必要と
なり、逆に外気温の高いところではヒートポンプの加温
能力は過剰となる。
この場合の補助加熱源としては燃焼機や電気ヒーター等
考えられるが、安全性、メンテナンスの点では電気ヒー
ターが優れる反面、この電気ヒーターは消費電力が太き
（燃焼器に比べて多少不経済な面もある。
この電気ヒーターのみならず、ヒートポンプサイクルも
電力の供給によって運転されることから、このヒートポ
ンプサイクル及び電気ヒーターの運転を使用料金の安い
深夜電力の供給によって行うことはエネルギーコストを
低減させる点で有効で、 ある。
しかしながら、深夜電力を利用する場合には、その供給
時間が８時間という制約を受けるため、そ、の時間内で
効率よく沸上げるには工夫が必要である。例えば、第２
図に示すようζこ外気温が低い時、ヒートポンプと補助
熱源を深夜電力供給開始と同時に運転すれば、加温能力
は太き（なるが第３図に示すように深夜電力供給時間帯
の前半で沸上がることになり、ヒートポンプの運転時間
が短くなると共に放熱時間が長くなり効率的とは言えな
い。また、外気温の高い時には、ヒートポンプだけで深
夜電力時間帯の前半で沸上がることになり、放熱などに
よるロスが大きくなる。このことは、温水タンク内に残
湯がある場合にはなお一層筋長される。
く目的〉
本発明は上記の点に鑑み、消費電力の大きい電気ヒータ
ーの運転を最少限度に抑えてできるだけヒートポンプサ
イクルの加熱によって貯湯槽の水を加熱し、しかもヒー
トポンプサイクル及び電気ヒーターの運転を深夜電力を
有効に使用し放熱ロスが少ないよう深夜電力供給終了時
に槽内湯温が設定温度に達するよう制御するヒートポン
プ式温水器を提供することを目的とする。
〈実施例〉
以下本発明の実施例を図面に従って説明する。
第４図は本発明実施例の回路図であって、この第４図に
おいて、１は圧縮器２、凝縮器３、膨張弁４、蒸発器５
を順次接続したヒートポンプサイクルであって、当該サ
イクルを運転することにより上記凝縮器３が加熱器とし
て作用する。
６は上記ヒートポンプサイクルｌによって加熱される被
加熱回路であって、この被加熱回路６は加熱したお湯を
貯留する貯湯槽７と、この貯湯槽７内の水に上記凝縮器
３の熱を与えるための受熱器８と、この被加熱回路６中
の水を強制的に循環させるためのポンプ９とから構成さ
れ、このポンプ８の駆動により貯湯槽６内の水か下部よ
り取り出されて受熱器８を通って再び貯湯槽６に戻ると
いうサイクルを繰り返す。
ＩＯは上記ヒートポンプサイクル１と被加熱回路６とを
繋ぐための熱交換器であって、この熱交換器ＩＯ内に上
記ヒートポンプサイクル１の凝縮器３と被加熱回路６の
受熱器８とが対向して熱伝的に内設されている。
１１は上記貯湯槽７内の下部に内設された電気ヒーター
であって、このヒーター１１は」二記ヒートポンプサイ
クル１による加熱能力が外気温の影響により給湯負荷よ
り下回わる場合にヒートポンプサイクルｌによる加熱と
併わせで補助的に貯湯槽７の水を加熱するものである。
１２は室外等に設けられた外気温センサー、Ｉ３はこの
外気温センサー１２の出力に応じて上記ヒートポンプサ
イクル１（具体的には圧縮器２）及び電気ヒーター１１
の運転制御を行う制御回路であって、この制御回路１３
は第５図に示すような構成になっている。
即ち、第５図は、上記制御回路１３を機能的に記載した
ブロツク図であって、この第３図において、１４は外気
温センサー１２からのデータ信号を適宜電気信号に変換
する入力部、１５はこの外気温に応じて、外気温に基（
ヒートポンプサイクルの加温能力が、給湯負荷を」二回
わる領域にあるか下回わる領域にあるかを判定する領域
判定手段、ｌ６は上記外気埠に応じて後述のシフト時間
に決定するに当って、外気温とシフト時間との相関関係
に基（データが収納されているデータ収納部、１７は外
気温TECHNICAL FIELD The present invention relates to a heat pump type water heater that includes a heat pump cycle operated using late-night electricity and an electric heater as an auxiliary heating source, and particularly relates to operation control of the heat pump cycle and electric heater. <Prior art> Heat pump water heaters absorb heat from the atmosphere to create hot water, so the heating capacity is greatly affected by the outside temperature. In other words, as shown in Figure 1, the heating capacity of the heat pump The capacity increases as the outside temperature rises, but the hot water supply load generally decreases.Therefore, in places where the outside temperature is low, the heat pump alone will not have enough power and an auxiliary heating source will be required, and conversely, in places where the outside temperature is high, In this case, the heating capacity of the heat pump becomes excessive. In this case, combustion equipment or electric heaters can be considered as auxiliary heating sources, but while electric heaters are superior in terms of safety and maintenance, they consume a lot of power. (It is also somewhat uneconomical compared to a combustor. Since not only this electric heater but also the heat pump cycle is operated by electricity supply, the heat pump cycle and electric heater can be operated by late-night electric power, which is cheaper to use.) However, when using late-night electricity, the supply time is limited to 8 hours, so it is difficult to efficiently boil the electricity within that time. In order to increase the
As shown in the figure, if the heat pump and auxiliary heat source are operated at the same time as the late-night power supply starts when the outside temperature is low, the heating capacity will increase (as shown in Fig. As a result, the operation time of the heat pump becomes shorter and the heat dissipation time becomes longer, which is not efficient.Furthermore, when the outside temperature is high, the heat pump alone will cause the heat pump to boil in the first half of the night when the power is on. , the loss due to heat radiation, etc. becomes large.This problem becomes even more serious when there is residual hot water in the hot water tank.Purpose> In view of the above points, the present invention has been developed to reduce the power consumption of electric heaters. The operation is kept to a minimum, and the water in the hot water storage tank is heated as much as possible by the heating of the heat pump cycle.In addition, the heat pump cycle and the electric heater are operated using late-night power effectively, so that the water temperature in the tank is kept low when the power supply ends in the middle of the night to reduce heat loss. An object of the present invention is to provide a heat pump type water heater that controls water to reach a set temperature. <Examples> Examples of the present invention will be described below with reference to the drawings. Fig. 4 is a circuit diagram of an example of the present invention. In FIG. 4, 1 indicates a compressor 2, a condenser 3, an expansion valve 4, and an evaporator 5.
The condenser 3 acts as a heater by operating the heat pump cycle. Reference numeral 6 denotes a heated circuit that is heated by the heat pump cycle 1, and this heated circuit 6 includes a hot water storage tank 7 that stores heated hot water, and a hot water storage tank 7 that applies heat from the condenser 3 to the water in the hot water storage tank 7. It consists of a heat receiver 8 for heating the heated circuit 6, and a pump 9 for forcibly circulating the water in the heated circuit 6. When the pump 8 is driven, the water in the hot water storage tank 6 is taken out from the lower part and sent to the heat receiver. 8 and returns to the hot water tank 6 again, and the cycle is repeated. IO is a heat exchanger for connecting the heat pump cycle 1 and the heated circuit 6, and the condenser 3 of the heat pump cycle 1 and the heat receiver 8 of the heated circuit 6 face each other in the heat exchanger IO. It is installed internally for heat conduction. Reference numeral 11 denotes an electric heater installed in the lower part of the hot water storage tank 7, and this heater 11 operates in the heat pump cycle 1 when the heating capacity of the heat pump cycle 1 described in 2 is lower than the hot water supply load due to the influence of the outside temperature. The water in the hot water storage tank 7 is heated in addition to the heating by the hot water storage tank 7. Reference numeral 12 denotes an outside temperature sensor installed outdoors, etc., and I3 controls the heat pump cycle 1 (specifically, the compressor 2) and the electric heater 11 according to the output of this outside temperature sensor 12.
A control circuit for controlling the operation of the control circuit 13.
has a configuration as shown in FIG. That is, FIG. 5 is a block diagram functionally illustrating the control circuit 13, and in FIG. is based on the outside temperature (
A region determination means 16 determines whether the heating capacity of the heat pump cycle is in a region where the hot water supply load is twice or less than the hot water supply load, and l6 is a region determining means for determining the shift time described later according to the outside air terminal. Based on the correlation between the outside temperature and the shift time (data storage section 17 is the outside temperature)
【の入力を受けて各領域に応じたシフト時間Ｈを演
算するシフト時間演算手段、１８は深夜電力供給開始時
よりの時間りを検出するタイマー、１９はこのタイマー
１８からの出力を受けて深夜電力開始時よりの時間りが
シフト時間に達したかどうかを知るために（Ｈ−ｂ）の
演算を行う減算手段、２０はこの減算手段１９の出力が
０になるか否かを判定する判定手段、２１はこの判定手
段２１の出力を受けて当該手段２０の出力が０になれば
領域によってヒートポンプ若しくは電気ヒータを運転す
る運転信号発生手段であって、当該手段２１の出力によ
って、ヒートポンプ若しくは電気ヒータが深夜電力供給
開始時よりシフト時間Ｈたけ遅れて運転が開始される。
次に上記構成の制御回路１３の制御動作について、第６
図のフローチャートを参考にして説明する。
先ず、外気温【が上記センサー１２によって測定され、
この外気温ｔが第２図に示すＴ１ の値を越えるか否か
が判定される（ｔ＜Ｔ１ｏｒｔ≧Ｔ、 ）。７このＴ１
は第５図に示すように、外気温によるヒートポンプの
加温能力が給湯負荷を上回わる点であって、外気温【が
このＴ１ を越えれば電気ヒーターによる補助加熱は必
要なく、下回われば必要となる。
ここでこのＴ１ を越える場合、越えない場合夫々で動
作が異なるので別個に説明する。
先ず、外気温【がＴｌ を下回わる場合について説明す
ると、この場合はヒートポンプサイクル１の加熱のみで
は給湯負荷に対応できないので外気温度に応じてシフト
時間Ｈを定め深夜電力供給時よりヒートポンプサイクル
ｌを運転すると共にこのシフト時間Ｈだけ遅らせて電気
ヒーター１１の運転を併わせで行わせ、深夜電力供給終
了時に設定湯温に沸き上げるようにヒートポンプサイク
ル】及び電気ヒーター１１を制御する。
即ち、第７図に示すように、先ず深夜電力開始と同時に
ヒートポンプサイクルｌを運転する。この時第４図に示
すポンプ９が駆動されて貯湯槽７内の水が回路６内を循
環しながら加熱され昇温してい（。一方で、第８図の線
図に基いて、外気温ＴＬに応じた電気ヒーター１１のシ
フト時間Ｈが記憶されたデータより定められ、深夜電力
供給開始時よりこのＨ時間経過したところでヒートポン
プサイクル１に加えて電気ヒーター１１の運転が開始す
る。すると、第７図に示す如（加温能力が上冒し、深夜
電力終了と同時に貯湯槽７内の湯温か設定温度に到達す
る。
尚、第８図に示す外気温ＴＬと電気ヒーターのシフト時
間Ｈとの相関曲線図は、所定容量の水を設定湯温にまで
深夜電力供給時間（８時間）内に加熱するとして、電気
ヒーターの運転開始時間をＨ時間だけ遅らせた時に深夜
電力供給終了時に設定湯温に沸き上かるように、水の温
度、貯湯容量、ヒートポンプサイクル及び電気ヒーター
の加温能力から実験的に定めた近似曲線である。
次に第２図において外気温がＴ を上回わる場合につい
て説明すると、この場合はヒートポンプサイクルの加温
能力が給湯負荷より上回わるので、電気ヒーターの補助
加熱は必要なく、外気温かＴ１より上がる程ヒートポン
プサイクルの加温能力が過剰となるので、ヒートポンプ
サイクルの運転開始時間を深夜電力供給開始時よりシフ
ト時間■４だけ遅らせて開始させる。
即ち第９図に示すように、外気温Ｔ、に応じてヒートポ
ンプのシフト時間Ｈを定め、第１Ｏ図に示すように深夜
電力開始時よりＨ時間だけ遅らせてヒートポンプサイク
ルの運転を開始し、深夜電力供給終了と同時に設定湯温
に沸き」−げるようにする。
尚、第９図に示すこの外気ｇ、Ｔ）ｌ とヒートポンプ
サイクルのシフト時間Ｈとの相関線図は」−配力８図の
外気温−電気ヒーターシフト時間線図と同様に実験的に
定められたものである。
従って上述のヒートポンプ式給湯機によれば、外気温に
応じて領域を分け゛〔、電気ヒーターの補助加熱の必要
のない領域においてはヒートポンプサイクルのみの運転
で、深夜電力供給終了時に設定湯温に沸き上がるように
ヒートポンプサイクルの運転開始時間をシフト時間Ｈだ
け遅らせ、又、電気ヒーターによる補助加熱が必要な時
は極力ヒートポンプサイクルを用いて運転すると共にヒ
ーターの補助加熱を併用する場合に、深夜電力供給終了
と同時に設定湯温に沸き上がるようにシフト時間Ｈだけ
電気ヒーターの運転開始時間を遅らせたので、料金の安
い深夜−力が供給される８時間内に、極力消費電力の大
きい電気ヒーターの運転を行なわずにヒートポンプによ
る加熱で賄うことができ、消費電力を減少させてエネル
ギーコストの低減を可能とすると共に、深夜電力供給終
了と同時に設定湯温に沸き上がるように領域に応じてヒ
ートポンプサイクル若しくは電気ヒーターの運転開始時
間をシフト時Ｈだけ遅らせたので、深夜電力供給終了時
間より早めに沸きあがって所定温度に維持Ｔるよう温度
制御する必要がなく、有効に深夜電力を利用することが
できる。
〈他の実施例〉
次に、貯湯槽ＩＩ内に残湯がある場合には加温量が残湯
量に応じて変える必要があるので、この場合の実施例に
ついて第１１図を用いて説明する。
尚、第４図図示の第１実施例と同一構成部分については
同符号を付し説明を省略する。
第１１図において、１４ａ、１４ｂ、１４ｃは貯湯槽１
１内の上位、中位、下位の夫々に設けられたサーミスタ
等の温度検出器、１５はこの温度検出器１４ａ、１４ｂ
、１４ｃの検知出力に基いて槽１１内の残湯量を検出す
るための残湯量検知回路、１６はこの残湯量検知回路１
５及び外気温センサー１２からの信号を受けてヒートポ
ンプサイクル１若しくは電気ヒーター１１の運転を制御
する制御回路である。その他の構成は第４図のものと同
一である。
上記構成のヒートポンプ式温水器の動作を説明すると、
サーミスタ＋４ａ、１４ｂ、＋４ｃで槽１１内の上部、
中部、下部の温度か測定さｎ、この検知結果が上記残湯
量検知回路１５へ送られて、これらサーミスタの温度を
適宜電気信号に変換し、この結果が制御回路１６に送ら
れると共に外気温センサー１２によって外気温度が入力
されて、この外気温及び残湯量に応じたヒートポンプサ
イクル１及び電気ヒーター１１の運転制御が行われる。
この場合制御回路１６は、残湯…検知のための各サーミ
スタ＋４ａ、＋４ｂ、１４ｃからの検出温度、外気温度
を読み取って、先ず外気温に基いて、電気ヒーターの補
助加熱が必要である領域かヒートポンプサイクルのみの
運転で良い領域かを判定する。ここで、外気温が電気ヒ
ーターの補助加熱が必要な領域である場合には、深夜電
力供給開始と同時にヒートポンプサイクルを運転し、一
方で残湯量に応じて電気ヒーターのシフト時間Ｈを定め
、深夜電力供給開始時よりＨ時間だけ遅らせて電気ヒー
ターを運転開始し、深夜電力供給終了と同時に設定温度
に沸き上がるようにする。つまり、深夜電力供給終了と
同時に設定湯温に沸き上かるようにシフト時間Ｈを定め
る。
このノット時間Ｈの判断基準は、第１２図の外気温−電
気ヒーターシフト時間線図による。即ち、第１２図に示
すように、残湯量に応して外気温−電気ヒーターシフト
線図はＡ −Ａ４と夫々異なす、との残湯量に応じて選
定された線図Ａ１−Ａ４個々において外気温に基いて′
嘔気ヒーターシフト時間Ｈが定められる。
具体的に一例を説明すると、
１、サーミスター４ａ、１４ｂ、１４ｃによりすべての
水位において４０℃以下であることが検知されると、残
湯量がほとんどないものとし、第１２図に示すように、
Ａ１線図が選定され、このＡ、に基いて外（（温がＴＬ
の場合にはシフト時間Ｈ１か定めらｎる。
このようにシフト時間Ｈか定められると、第１３図の沸
き上げ特性図に示すように深夜電力供給開始と同時にヒ
ートポンプサイクルが運転されて貯湯水が昇温し、供給
開始時よりＨ，時間経過後電気ヒーターの運転が開始さ
れて、Ｂ１に示すように昇温し、深夜電力供給終了時に
設定湯温に沸き上がる。
２、又、最上位のサーミスター４８のみ４０℃以上の水
があることを検知し、中部、低部にはない場合には、同
様にして第１２図に示すＡ２線図が選択されて、このＡ
２線図に基いて外気温ＴＬ に応じたシフト時間Ｈ２が
定められる。
このようにシフト時間Ｈ２が定められると、第１３図に
示すように電気ヒーターかＨ２時間だけ遅れて運転開始
され、Ｂ２に示すような沸き上げ特性となり深夜電力供
給終了時に設定湯温に到達する。
３、同様にして、最上部及び中部のサーミスタ＋４８
、＋４ｂが４０℃以上であることを検知すると、第１２
図において、Ａ３線図が選択されてシフト時間Ｈ３が定
められ、このシフト時間Ｈ３に応じて電気ヒーターが運
転制御されて第１３図のＢ３沸き上げ特性図を得る。
４、同様にしてすべてのサーミスタ１４ａ、＋４ｂ、１
４ｃにおいて、４０℃以上の水があると判定された場合
には、第１２図においてＡ４線図が選定されてシフト時
間Ｈ４が定められ、これに応じてＢ４の沸き上げ特性が
得られる。
以上のように、残湯量に応じて、１９湯量が多い場合に
はシフト時間Ｈを短か（、残湯量が少ない場合１こはシ
フト時間Ｈを多（とって、深夜電力供給終了と同時に設
定湯温に到達するようにする。
次に、外気温によって、ヒートポンプの加温能が給湯負
荷を上回わり電気ヒーターによる補助加熱の必要がない
領域であることが判定されると、電気ヒーターの運転は
行わずに外気温に応じたヒートポンプサイクルの運転開
始時間を深夜電力供給開始時間よりシフト時間Ｈだけ遅
らせて深夜電力供給終了時に設定湯温に達するようにす
る。
このヒートポンプサイクルのシフト時間Ｈの判断基準は
、第１４図の外気温−ヒートポンプサイクルシフト時間
線図において、各サーミスタの検知出力に基づ（残湯量
に応じた線図Ａ１〜Ａ４が選択され（選択基準は上記１
〜４に基づく）で、外気温ＴＨに対応するシフト時間Ｈ
１〜Ｈ４が定められ、このシフト時間Ｈ１〜Ｈ４分だけ
、ヒートポンプサイクルの運転開始時間が遅延されて運
転が行われて、深夜電力供給終了と同時に設定湯温に沸
き上がる。（沸き上げ特性線図第１５図参照）
尚、上記実施例においては残湯量を検知ファクターとし
てとらえたが、同様にして残湯温度をファクターとして
とらえ、この残湯温度に応じたシフト時間を定めて、深
夜電力供給終了時に設定温度に沸き上げるようにするこ
とも可能である。
尚、上記実施例では深夜電力供給時間内に当該電力を利
用して設定湯温に沸き上げるよう制御する例を示したが
、当該方法はこれに限らず、一定時間内にある設定され
た値に温度、湿度等を調整するもの全てに適用すること
ができる。
〈効果〉
以上本発明によれば、外気温の判定領域に応じてヒート
ポンプ若しくは電力ヒーターの運転時間を所定時間だけ
、遅らせて、深夜電力供給終了時に設定湯温に沸き上が
るよう制御する制御回路を設けたので、料金の安い深夜
電力を有効に利用してエネルギコストを低減できると共
に貯湯槽での放熱時間の短縮及び深夜電力ピーク時の回
避を実現することができる。Shift time calculating means that receives the input from [ and calculates the shift time H according to each area; 18 is a timer that detects the time since the start of power supply at midnight; 19 is a timer that receives the output from this timer 18 and calculates the shift time H according to each area. A subtractor 20 performs the calculation (H-b) in order to determine whether the time since the start of power has reached the shift time; 20 is a determination unit 20 that determines whether the output of the subtractor 19 becomes 0 or not; Means 21 is an operation signal generating means that receives the output of the determining means 21 and operates the heat pump or electric heater depending on the region when the output of the means 20 becomes 0. The heater starts operating a shift time H later than when power supply starts late at night. Next, the control operation of the control circuit 13 having the above configuration will be explained in the sixth section.
This will be explained with reference to the flowchart in the figure. First, the outside temperature is measured by the sensor 12,
It is determined whether this outside temperature t exceeds the value of T1 shown in FIG. 2 (t<T1ort≧T,). 7This T1
As shown in Figure 5, T1 is the point at which the heating capacity of the heat pump due to the outside temperature exceeds the hot water supply load; It becomes necessary. Here, the operations will be explained separately depending on whether T1 is exceeded or not. First, let us explain the case where the outside air temperature falls below Tl. In this case, the heat pump cycle 1 cannot handle the hot water supply load by heating alone, so the shift time H is determined according to the outside air temperature, and the heat pump cycle l starts when power is supplied late at night. At the same time, the electric heater 11 is operated with a delay of this shift time H, and the heat pump cycle and the electric heater 11 are controlled so that the hot water is heated to the set temperature when power supply ends in the middle of the night. That is, as shown in FIG. 7, first, the heat pump cycle 1 is operated at the same time as the power starts in the middle of the night. At this time, the pump 9 shown in Fig. 4 is driven, and the water in the hot water tank 7 is circulated within the circuit 6, heating and rising in temperature (on the other hand, based on the diagram in Fig. 8, the outside temperature is The shift time H of the electric heater 11 according to the TL is determined from the stored data, and the operation of the electric heater 11 is started in addition to the heat pump cycle 1 when this H time has elapsed since the start of power supply in the middle of the night. As shown in Fig. 7 (the heating capacity is exceeded, the hot water temperature in the hot water storage tank 7 reaches the set temperature at the same time as the power ends in the middle of the night. The correlation curve diagram shows that, assuming that a predetermined volume of water is heated to the set hot water temperature within the midnight power supply time (8 hours), if the electric heater operation start time is delayed by H hours, the set hot water temperature will change when the midnight power supply ends. This is an approximate curve determined experimentally based on the water temperature, hot water storage capacity, heat pump cycle, and heating capacity of the electric heater so that the temperature rises to a boiling point. To explain, in this case, the heating capacity of the heat pump cycle exceeds the hot water supply load, so there is no need for auxiliary heating by the electric heater, and as the outside temperature rises above T1, the heating capacity of the heat pump cycle becomes excessive, so the heat pump The cycle operation start time is delayed by shift time ■4 from the start of midnight power supply. That is, as shown in Fig. 9, the heat pump shift time H is determined according to the outside temperature T, and as shown in Fig. 1O. As shown in FIG. 9, the operation of the heat pump cycle is started with a delay of H hours from the start of the midnight power supply, and the water is brought to the set temperature at the same time as the midnight power supply ends. , T)l and the shift time H of the heat pump cycle is experimentally determined in the same way as the outside temperature - electric heater shift time diagram in the power distribution diagram 8. Therefore, the above-mentioned heat pump According to the type water heater, the areas are divided according to the outside temperature. In areas where auxiliary heating by the electric heater is not required, only the heat pump cycle is operated, and the heat pump cycle is activated so that the water reaches the set temperature when the power supply ends in the middle of the night. The start time of the cycle is delayed by shift time H, and when auxiliary heating with an electric heater is required, the heat pump cycle is used as much as possible, and when auxiliary heating of the heater is used, it is set at the same time as the power supply ends late at night. By delaying the start of operation of the electric heater by shift time H to allow the water to reach the same temperature, the heat pump can be operated without operating the electric heater, which consumes as much power as possible, during the 8-hour period when power is supplied late at night, when electricity is cheaper. In addition to reducing power consumption and reducing energy costs, the heat pump cycle or electric heater operation start time depending on the area so that the water reaches the set temperature as soon as the power supply ends in the middle of the night. Since the temperature is delayed by the shift time H, there is no need to control the temperature so that the temperature is heated earlier than the midnight power supply end time and maintained at a predetermined temperature T, and the late night power can be used effectively. <Other Examples> Next, when there is residual hot water in the hot water storage tank II, the amount of heating needs to be changed according to the amount of remaining hot water, so an example in this case will be explained using FIG. 11. . Components that are the same as those of the first embodiment shown in FIG. 4 are designated by the same reference numerals and their explanations will be omitted. In FIG. 11, 14a, 14b, and 14c are hot water storage tanks 1.
Temperature detectors such as thermistors provided at the upper, middle, and lower positions in 1, 15 are the temperature detectors 14a and 14b.
, 14c, a remaining hot water amount detection circuit for detecting the amount of remaining hot water in the tank 11 based on the detection output of 14c; 16 is this remaining hot water amount detection circuit 1;
This is a control circuit that controls the operation of the heat pump cycle 1 or the electric heater 11 in response to signals from the heat pump cycle 1 and the outside temperature sensor 12. The rest of the configuration is the same as that in FIG. 4. To explain the operation of the heat pump type water heater with the above configuration,
The upper part of the tank 11 with thermistors +4a, 14b, +4c,
The temperature of the middle and lower portions is measured, and the detection results are sent to the remaining hot water amount detection circuit 15, which converts the temperatures of these thermistors into electrical signals as appropriate, and the results are sent to the control circuit 16 and the outside temperature sensor. 12, the outside air temperature is input, and the operation of the heat pump cycle 1 and the electric heater 11 is controlled according to the outside air temperature and the amount of remaining hot water. In this case, the control circuit 16 reads the detected temperature from each thermistor +4a, +4b, and 14c for detecting remaining hot water and the outside air temperature, and first determines whether the area requires auxiliary heating with the electric heater based on the outside air temperature. Determine whether it is appropriate to operate only the heat pump cycle. Here, if the outside temperature is in a range that requires supplementary heating by the electric heater, the heat pump cycle is operated at the same time as power supply starts in the middle of the night, and the shift time H of the electric heater is determined depending on the amount of remaining hot water. The operation of the electric heater is started with a delay of H hours from the start of power supply, so that the temperature reaches the set temperature at the same time as the power supply ends in the middle of the night. In other words, the shift time H is determined so that the hot water reaches the set temperature at the same time as the late-night power supply ends. The criterion for determining the knot time H is based on the outside temperature-electric heater shift time diagram shown in FIG. That is, as shown in FIG. 12, the outside temperature-electric heater shift diagrams are different from A-A4 depending on the amount of remaining hot water, and the graphs A1-A4 are individually selected according to the amount of remaining hot water. Based on outside temperature′
A nausea heater shift time H is determined. To explain a specific example, 1. If the thermistors 4a, 14b, and 14c detect that the water level is 40°C or lower at all water levels, it is assumed that there is almost no remaining hot water, and as shown in Fig. 12,
The A1 diagram is selected, and based on this A, the outside ((temperature is TL
In this case, the shift time H1 is determined. When the shift time H is determined in this way, as shown in the boiling characteristic diagram in Figure 13, the heat pump cycle is operated at the same time as the power supply starts in the middle of the night, and the temperature of the stored hot water rises, and the time H has elapsed since the start of the supply. The rear electric heater starts operating, and the temperature rises as shown in B1, and the water reaches the set temperature at the end of the midnight power supply. 2. Also, if only the thermistor 48 at the top level detects that there is water at 40°C or higher, and there is no water at the middle or lower part, the A2 diagram shown in FIG. 12 is similarly selected, This A
The shift time H2 is determined according to the outside temperature TL based on the two-line diagram. When the shift time H2 is determined in this way, the electric heater starts operating with a delay of H2 hours as shown in Fig. 13, and the boiling characteristics as shown in B2 are achieved, and the set water temperature is reached when the power supply ends in the middle of the night. . 3. Similarly, the thermistor at the top and middle +48
, +4b is detected to be 40°C or higher, the 12th
In the figure, the A3 diagram is selected and the shift time H3 is determined, and the electric heater is controlled in accordance with this shift time H3 to obtain the B3 boiling characteristic diagram shown in FIG. 4. Similarly, all thermistors 14a, +4b, 1
4c, if it is determined that there is water at 40° C. or higher, the A4 diagram is selected in FIG. 12, the shift time H4 is determined, and the boiling characteristics of B4 are obtained accordingly. As mentioned above, depending on the amount of hot water remaining, 19 If the amount of hot water is large, the shift time H should be shortened (19 If the amount of remaining hot water is low, the shift time H should be set long) Next, when it is determined that the heating capacity of the heat pump exceeds the hot water supply load based on the outside temperature and there is no need for supplementary heating with the electric heater, the electric heater is turned off. The operation start time of the heat pump cycle according to the outside temperature is delayed by the shift time H from the midnight power supply start time without running, so that the set hot water temperature is reached when the midnight power supply ends.The shift time H of this heat pump cycle The judgment criteria are based on the detection output of each thermistor in the outside temperature vs. heat pump cycle shift time diagram in Fig. 14 (diagrams A1 to A4 corresponding to the amount of remaining hot water are selected (selection criteria are the above 1).
~4), the shift time H corresponding to the outside temperature TH
1 to H4 are determined, and the operation start time of the heat pump cycle is delayed by the shift time H1 to H4, and the hot water is heated to the set temperature at the same time as the midnight power supply ends. (See Figure 15 of the boiling characteristic diagram) In the above embodiment, the amount of remaining hot water was taken as a detection factor, but in the same way, the temperature of the remaining hot water was taken as a factor, and the shift time was determined according to the temperature of the remaining hot water. It is also possible to raise the temperature to a set temperature when power supply ends late at night. In addition, in the above embodiment, an example was shown in which the electric power is used to control the boiling water to a set temperature during the midnight power supply time, but the method is not limited to this, and the method is not limited to this. It can be applied to anything that adjusts temperature, humidity, etc. <Effects> According to the present invention, a control circuit is provided which delays the operation time of the heat pump or the electric heater by a predetermined period of time depending on the judgment range of the outside temperature, and controls the water to reach the set temperature when the power supply ends in the middle of the night. Therefore, it is possible to reduce energy costs by effectively using low-cost late-night electricity, and to shorten the heat dissipation time in the hot water tank and avoid peak electricity consumption at night.
第１図及び第２図は、ヒートポンプサイクルの加温能力
及び給湯負荷と外気温との関係線図、第３図は、深夜電
力供給時間と湯温との関係線図（一般例）、
第４図は、本発明実施例の回路図、
第５図は、本発明実施例に用いられる制御回路の機能ブ
ロック図、
第６図は、同上フローチャート、
第７図及び第１Ｏ図は、本発明実施例による深夜電力供
給時間と湯温との関係線図、
第８図は、電気ヒーターのシフト時間と外気温との関係
線図、
第９図は、ヒートポンプサイクルのシフト時間と外気温
との関係線図、
第１１図は、他の実施例の回路図、
第１２図は、他の実施例に用いられる電気ヒーターのシ
フト時間と外気温との関係線図、第１３図及び第１５図
は、同上深夜電力供給時間の湯温との関係線図、
第１４図は、同上ヒートポンプサイクルのシフト時間と
外気温との関係線図。
１：ヒートポンプサイクル、３：凝縮器（加熱器）、７
；貯湯槽、１１：電気ヒーター、１２：外気温センサー
、１３，１６：制御回路。
代理人 弁理士 福 士 愛 彦（他２名）温
能
力
一一一一一参 外【燻
：＄／ 図
第２図 ：≧’３＋’ｉ
：？、５ 区
亀凭ヒー９シフト時間
第８図
第９ 図
寿運良電力訊檜咄１硝
第７図
第１０ 凶
會乳し−９−シフト貸１八ｊ
第１２図
し−上イン７′シフトｙ１Ｎ５
第１４図
第１３図
別’＊ｔ７７４５１．檜時刑
第１５ 図Figures 1 and 2 are relationship diagrams between the heating capacity of the heat pump cycle, hot water supply load, and outside temperature; Figure 3 is a relationship diagram between late-night power supply time and hot water temperature (general example); 4 is a circuit diagram of an embodiment of the present invention, FIG. 5 is a functional block diagram of a control circuit used in an embodiment of the present invention, FIG. 6 is a flowchart of the same as above, and FIG. 7 and FIG. Figure 8 is a diagram showing the relationship between electric heater shift time and outside temperature according to the example; Figure 9 is a diagram showing the relationship between heat pump cycle shift time and outside temperature. Relationship diagram, Figure 11 is a circuit diagram of another embodiment, Figure 12 is a relationship diagram between electric heater shift time and outside temperature used in another embodiment, Figures 13 and 15. Figure 14 is a relationship diagram between the shift time of the heat pump cycle and outside air temperature. 1: Heat pump cycle, 3: Condenser (heater), 7
; hot water tank, 11: electric heater, 12: outside temperature sensor, 13, 16: control circuit. Agent Patent Attorney Aihiko Fukushi (and 2 others) Onriki 11111 Outside [Smoking: $/ Figure 2: ≧'3+'i:? , 5 Ward Turtle Heat 9 Shift Hours Figure 8 Figure 9 Figure Juunryo Electric Power Station 1 Glass Figure 7 Figure 10 Bad Breast Milk - 9 - Shift Rental 18j Figure 12 Shi - Upper Inn 7' Shift y1N5 Figure 14 Figure 13 Separate '*t77451. Hinoki Jigyo Figure 15
Claims (1)
ポンプサイクルの加熱器と、深夜電力を利用しこのヒー
トポンプサイクルの加熱器による加熱が不足する時に上
記槽内の水を補助的に加熱する電気ヒータとを併設して
成るヒートポンプ式温水器において、 下記１及び２の動作をヒートポンプサイクル及び電気ヒ
ータに行わせる制御回路を設けたことを特徴とするヒー
トポンプ式温水器。 ■、外気温によって、ヒートポンプサイクルの加温能力
が給湯負荷を下回わり電気ヒータによる補助加熱が必要
な時には、 深夜電力供給開始時よりヒートポンプサイクルのみの加
熱運転を行い、 深夜電力供給終了時に槽内湯温が設定温度に達するよう
に電気ヒータの運転開始時間を外気温に応じてヒートポ
ンプの運転開始時より所定時間遅らせる。 ■ 外気温によって、ヒートポンプサイクルの加温能力
が給湯負荷を上回わり電気ヒータによる補助加熱が必要
ない時には、 深夜電力供給終了時に槽内湯温が設定温度に達するよう
に、ヒートポンプサイクルの運転開始時間を深夜電力供
給開始時間より所定時間遅らせる。[Scope of Claims] 1. A heater for a heat pump cycle that heats water in a hot water tank using late-night electricity; A heat pump type water heater equipped with an electric heater for auxiliary heating of water, characterized in that the heat pump type water heater is equipped with a control circuit that causes the heat pump cycle and the electric heater to perform the following operations 1 and 2. . ■When the heating capacity of the heat pump cycle falls below the hot water supply load due to the outside temperature and auxiliary heating with an electric heater is required, the heating operation of only the heat pump cycle is performed from the start of power supply in the middle of the night, and the heating operation of the heat pump cycle is started when the power supply ends in the middle of the night. The electric heater's operation start time is delayed by a predetermined period of time from the heat pump's operation start time according to the outside temperature so that the indoor water temperature reaches a set temperature. ■ When the heating capacity of the heat pump cycle exceeds the hot water supply load due to the outside temperature and auxiliary heating by the electric heater is not required, the operation start time of the heat pump cycle is adjusted so that the hot water temperature in the tank reaches the set temperature when the power supply ends in the middle of the night. is delayed by a predetermined period of time from the midnight power supply start time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59064567A JPS60205149A (en) | 1984-03-29 | 1984-03-29 | Heat pump type water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59064567A JPS60205149A (en) | 1984-03-29 | 1984-03-29 | Heat pump type water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60205149A true JPS60205149A (en) | 1985-10-16 |
| JPH046851B2 JPH046851B2 (en) | 1992-02-07 |
Family
ID=13261934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59064567A Granted JPS60205149A (en) | 1984-03-29 | 1984-03-29 | Heat pump type water heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60205149A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6448542U (en) * | 1987-09-22 | 1989-03-24 | ||
| JPH01239349A (en) * | 1988-03-17 | 1989-09-25 | Daikin Ind Ltd | Heat pump type hot water feed apparatus |
| JP2007071472A (en) * | 2005-09-08 | 2007-03-22 | Toshiba Electric Appliance Co Ltd | Hot water supply device |
| JP2013130356A (en) * | 2011-12-22 | 2013-07-04 | Mitsubishi Electric Corp | Storage water heater |
| JP2016050751A (en) * | 2014-09-02 | 2016-04-11 | 株式会社デンソー | Heat pump type water heater |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5938544A (en) * | 1982-08-30 | 1984-03-02 | Mitsubishi Electric Corp | Storage type hot water feeder |
-
1984
- 1984-03-29 JP JP59064567A patent/JPS60205149A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5938544A (en) * | 1982-08-30 | 1984-03-02 | Mitsubishi Electric Corp | Storage type hot water feeder |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6448542U (en) * | 1987-09-22 | 1989-03-24 | ||
| JPH01239349A (en) * | 1988-03-17 | 1989-09-25 | Daikin Ind Ltd | Heat pump type hot water feed apparatus |
| JP2007071472A (en) * | 2005-09-08 | 2007-03-22 | Toshiba Electric Appliance Co Ltd | Hot water supply device |
| JP4484221B2 (en) * | 2005-09-08 | 2010-06-16 | 東芝機器株式会社 | Water heater |
| JP2013130356A (en) * | 2011-12-22 | 2013-07-04 | Mitsubishi Electric Corp | Storage water heater |
| JP2016050751A (en) * | 2014-09-02 | 2016-04-11 | 株式会社デンソー | Heat pump type water heater |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH046851B2 (en) | 1992-02-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS6111539A (en) | Controller and method for defrosting outdoor coil of heat pump | |
| JP2008008548A (en) | Electric water heater | |
| JPS60205149A (en) | Heat pump type water heater | |
| JP3904402B2 (en) | Home fuel cell system | |
| JP2000346449A (en) | Heat pump hot-water supplier | |
| JP2557251B2 (en) | Water heater | |
| JP2003050051A (en) | Heat pump type hot-water supplier | |
| JP2003247757A (en) | Solar heater | |
| JPS6018731Y2 (en) | heat pump water heater | |
| JP2004028456A (en) | Hot-water space heating system | |
| JPS60164150A (en) | Heat pump type hot water supplier | |
| JP3979770B2 (en) | Hot water storage hot water supply system | |
| JPS6030425B2 (en) | solar water heater | |
| JP3371703B2 (en) | Hot water storage system | |
| JPH0875248A (en) | Water heater | |
| JPS6235583B2 (en) | ||
| JPS58140553A (en) | Warm water apparatus | |
| JP2001194008A (en) | Electric water heater and operating method of the same | |
| JPH05256520A (en) | Heat pump hot water feeder | |
| JPS60164158A (en) | Heat pump type hot water supplier | |
| JPH0814657A (en) | Heat pump hot water supply system | |
| JP3297543B2 (en) | Electric water heater | |
| JPS58123046A (en) | Heat pump type hot water supplier | |
| JP2001227819A (en) | Hot-water supply device utilizing solar energy | |
| JPH05256521A (en) | Heat pump hot water feeder |