JP2006343058A - Hot water supply apparatus - Google Patents

Hot water supply apparatus Download PDF

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JP2006343058A
JP2006343058A JP2005170642A JP2005170642A JP2006343058A JP 2006343058 A JP2006343058 A JP 2006343058A JP 2005170642 A JP2005170642 A JP 2005170642A JP 2005170642 A JP2005170642 A JP 2005170642A JP 2006343058 A JP2006343058 A JP 2006343058A
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hot water
temperature
storage tank
heat
water storage
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Hirotaka Kaneko
Tomoaki Kitano
Kazuo Uchitani
和雄 内谷
智章 北野
浩孝 金子
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Matsushita Electric Ind Co Ltd
松下電器産業株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/08Energy efficient heating, ventilation or air conditioning [HVAC] relating to domestic heating, space heating, domestic hot water heating [DHW] or supply systems
    • Y02B30/12Hot water central heating systems using heat pumps

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently operate a heat pump even when medium temperature water is produced. <P>SOLUTION: This hot water supply apparatus comprises a hot water storage tank 2; a heat pump circuit equipped with a compressor 1; a primary side circulating circuit 10 discharging hot water from the upper part of the hot water storage tank 2 and returning the hot water to the hot water storage tank 2 through a heat exchanger 11 for a heat radiating means; a secondary side circulating circuit 14 connected to the heat radiating means 13 through the heat exchanger 11 for the heat radiating means; a circulating pump 12 provided at the primary side circulating circuit 10; and a hot water storage tank lower part temperature detecting means provided at the lower part of the hot water storage tank 2. During the operation of the circulating pump 12, the compressor is controlled according to a temperature change rate computed from the temperature detected by the hot water storage tank lower part temperature detecting means 9. The heat pump can thereby be efficiently operated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、給湯装置に関するものである。 The present invention relates to a water heater.

従来この種の給湯装置では、貯湯槽の比較的上部に設けられた温度検知手段によりタンク上部の湯温を検出し、検出された温度が所定温度以下になるとヒートポンプ回路により沸き増しを行うことで、湯量を確保していた。 Conventionally in this kind of hot water supply device detects the hot water temperature of the tank top by temperature detecting means provided in a relatively upper portion of the hot water tank, the detected temperature by performing the increased boiling by comprising the heat pump circuit below a predetermined temperature , it was to secure the amount of hot water.

図7は、特許文献1に記載された従来の給湯装置を示すものである。 Figure 7 shows a conventional water heater described in Patent Document 1. 図7に示すように、圧縮機1を備えたヒートポンプ回路と、貯湯槽2、循環ポンプ3からなる給湯回路と、貯湯槽上部に備えられ湯温を検知する貯湯槽上部温度検知手段4と、水−冷媒熱交換器5により加熱され、貯湯槽上部に流入する湯温を検知する上部流入温度検知手段6により構成されている。 As shown in FIG. 7, a heat pump circuit including a compressor 1, the hot water storage tank 2, a hot water supply circuit comprising a circulation pump 3, a hot water tank upper temperature detecting means 4 for detecting the temperature of hot water provided in the hot water tank top, water - is heated by the refrigerant heat exchanger 5, is constituted by an upper inlet temperature detecting means 6 for detecting the temperature of hot water flowing into the hot water storage tank top. 貯湯槽上部温度検知手段4により検出された湯温が所定の温度を下回ると、圧縮機1の回転数を最大にして沸き増し運転を開始する。 When the hot water detected by the hot water storage tank upper temperature detector 4 temperature is below a predetermined temperature, the rotational speed of the compressor 1 starts the reheating operation to maximize. このとき、貯湯槽上部温度検知手段4により検知された貯湯層2の上部温度と、水−冷媒熱交換器5を流れる流体の出口温度が等しくなるように、上部流入温度検知手段6が検知して、循環ポンプ3の回転数を制御する。 At this time, the upper temperature of the hot water storage tank upper temperature sensing means hot water storage layer 2 which is detected by 4, water - so the exit temperature of the fluid flowing through the refrigerant heat exchanger 5 is equal detects the upper inlet temperature detecting means 6 Te, and it controls the rotation speed of the circulation pump 3. よって、残湯温度と同じ湯温かつ最大の加熱能力で追焚きを行うことができるため、出湯時の湯温変化がなく湯の利便性が向上させることができる。 Therefore, it is possible to perform the reheating in the same hot water warm one maximum heating capacity and the remaining hot water temperature can be hot water temperature changes without hot water convenience when tapping improves.
特開平8−296895号公報 JP-8-296895 discloses

しかしながら、上記従来の構成ではヒートポンプ給湯器に床暖房や浴室乾燥機などの放熱手段が接続された場合には、放熱手段に放熱することにより中温水が大量に生成され、貯湯槽に混合層が形成され、さらにはその混合層の温度に合わせて沸き上げを行う可能性もあるため沸き上げ温度自体が下がってしまい、必要湯量を十分に確保できないということが考えられた。 However, the if the heat radiating means such as a floor heating or bathroom dryer is connected to the heat pump water heater in the conventional configuration, medium-temperature water can be mass produced by radiating the heat dissipating means, a mixed layer in the hot water storage tank is formed, further the possibility of performing boiling in accordance with the temperature of the mixed layer also will be the boiling temperature itself falls due to, it was thought that can sufficiently secure the necessary amount of hot water.

また、放熱手段における負荷が大きい場合やふろへの湯張り等で大量に給湯される場合等、貯湯槽上部に設けられた温度検出手段により沸き増し運転の開始を制御しているため、特に外気温が低くヒートポンプによる加熱能力が比較的小さい条件において、十分に使用熱量を賄うことができず、貯湯槽内の湯量が徐々に減少し、放熱手段の運転を停止せざるを得ない可能性もあった。 Also, like the case that large quantities hot water in hot water filling, etc. to the case or bath load is large in the heat radiation unit, for controlling the start of the reheating operation by the temperature detection means provided in the hot water tank top, in particular the outer in air temperature is relatively low condition heating capacity by the heat pump low, it can not cover the full use heat, hot water in the hot water tank is gradually decreased, also stopping forced possible the operation of the heat dissipating means there were.

さらにはヒートポンプへの入水温度(水−冷媒熱交の水入口温度)が中温水となり、ヒートポンプ効率の比較的低い条件での運転を継続しなければならない状況も考えられた。 Further incoming water temperature to the heat pump - becomes medium-temperature water (water water inlet temperature of the coolant heat exchange) is also considered shall continue to operate at a relatively low condition status of the heat pump efficiency.

前記従来の課題を解決するために、本発明の給湯装置は、貯湯槽と、圧縮機を備えるヒートポンプ回路と、前記貯湯槽の上部から出湯して熱交換器を介して前記貯湯槽に戻す1次側循環回路と、前記熱交換器を介して放熱手段に接続する2次側循環回路と、1次側循環回路に設けられた循環ポンプと、貯湯槽の下部に設けられた貯湯槽下部温度検知手段とを備え、前記循環ポンプの動作中に、前記貯湯槽下部温度検知手段による温度から算出した温度変化率に応じて圧縮機を制御するものである。 In order to solve the above conventional problems, the water heater of the present invention comprises a hot water tank, back heat pump circuit comprising a compressor, the hot water storage tank via the heat exchanger and hot water from the upper portion of the hot water storage tank 1 and next-side circulation circuit, and the secondary side circulation circuit connected to the heat dissipating means through the heat exchanger, the primary side and the circulation pump provided in the circulation circuit, the hot water storage tank lower temperature provided at the lower portion of the hot water storage tank and a detecting means, during operation of the circulation pump, and controls the compressor in response to the temperature change rate calculated from the temperature by the hot water storage tank lower temperature detecting means.

これにより、放熱手段との熱交換により生成された中温水による貯湯槽の温度変化を推定することができ、かつ今後の使用湯量を推定することで、適切なタイミング、つまり後に湯切れにならないように前もって、かつヒートポンプ効率のよい入水温度(水−冷媒熱交の水入口側温度)で必要湯量を沸き増しすることができるため、湯切れや放熱手段の運転の停止といった使用者の不便を防ぐことができる。 Thus, according to the hot water in which is generated by heat exchange with the heat dissipating means can estimate the temperature change of the hot water storage tank, and to estimate the future use hot water, the right time, so as not to water shortage after clogging prevent it is possible to increase the water heating required hot water with - (water inlet side temperature of the refrigerant heat exchange water), the inconvenience of the user, such as stopping the operation of the hot water out and heat dissipating means in advance, and good incoming water temperature of the heat pump efficiency be able to.

本発明の給湯装置は、放熱手段が接続される等、放熱負荷が大きい場合でも、あらかじめ湯切れのないように沸き増しすることができ、かつ効率よい条件でヒートポンプを運転することができる。 Hot water supply device of the present invention, such as the heat dissipating means is connected, even if the heat radiation load is large, can be increased boiling so as not advance water shortage, and it is possible to operate the heat pump in efficient conditions.

第1の発明は、貯湯槽と、圧縮機を備えるヒートポンプ回路と、前記貯湯槽の上部から出湯して熱交換器を介して前記貯湯槽に戻す1次側循環回路と、前記熱交換器を介して放熱手段に接続する2次側循環回路と、1次側循環回路に設けられた循環ポンプと、貯湯槽の下部に設けられた貯湯槽下部温度検知手段とを備え、前記循環ポンプの動作中に、前記貯湯槽下部温度検知手段による温度から算出した温度変化率に応じて圧縮機を制御する給湯装置である。 A first invention is a hot water tank, a heat pump circuit including a compressor, a primary circulation circuit for returning the hot water storage tank via the heat exchanger and hot water from the upper portion of the hot water storage tank, the heat exchanger and secondary circulation circuit connected to the heat dissipating means via includes a circulation pump provided on the primary side circulation circuit, and a hot water tank bottom temperature detecting means provided in the lower portion of the hot water storage tank, operation of the circulation pump during a hot water supply device for controlling a compressor according to the temperature change rate calculated from the temperature by the hot water storage tank lower temperature detecting means.

これによって、放熱手段との熱交換により生成された中温水による貯湯槽の温度変化を推定することができ、かつ今後の使用湯量を推定することで、適切なタイミング、つまり後に湯切れにならないように前もって、かつヒートポンプ効率のよい入水温度(水−冷媒熱交の水入口側温度)で必要湯量を沸き増しすることができるため、湯切れや放熱手段の運転の停止といった使用者の不便を防ぐことができる。 This makes it possible to estimate the temperature change of the hot water storage tank by the hot water in which is generated by heat exchange with the heat radiating means, and to estimate the future use hot water, the right time, so as not to water shortage after clogging prevent it is possible to increase the water heating required hot water with - (water inlet side temperature of the refrigerant heat exchange water), the inconvenience of the user, such as stopping the operation of the hot water out and heat dissipating means in advance, and good incoming water temperature of the heat pump efficiency be able to.

第2の発明は、熱交換器から貯湯槽へ流入する温水温度を検知する流入温度検知手段を備え、循環ポンプの動作中に、温度検知手段により検知される温度変化率と、かつ前記流入温度検知手段による検知温度に応じて圧縮機を制御する請求項1記載の給湯装置である。 The second invention comprises an inlet temperature detection means for detecting a temperature of hot water flowing from the heat exchanger to the hot water storage tank, during operation of the circulation pump, the temperature change rate is detected by the temperature detecting means, and the inlet temperature a hot water supply apparatus according to claim 1, wherein for controlling the compressor in accordance with the detected temperature by the detection means.

これによって、放熱手段との熱交換により生成された中温水による貯湯槽の温度変化を推定することができ、かつ今後の使用湯量を推定することで、適切なタイミング、つまり後に湯切れにならないように前もって、かつヒートポンプ効率のよい入水温度(水−冷媒熱交の水入口側温度)で必要湯量を沸き増しすることができるため、湯切れや放熱手段の運転の停止といった使用者の不便を防ぐことができる。 This makes it possible to estimate the temperature change of the hot water storage tank by the hot water in which is generated by heat exchange with the heat radiating means, and to estimate the future use hot water, the right time, so as not to water shortage after clogging prevent it is possible to increase the water heating required hot water with - (water inlet side temperature of the refrigerant heat exchange water), the inconvenience of the user, such as stopping the operation of the hot water out and heat dissipating means in advance, and good incoming water temperature of the heat pump efficiency be able to.

さらに、1次側循環回路の熱交換器出口側に設けられた温度検出手段により圧縮機を制御することができるので、給湯により下部から比較的低温の新鮮水が流入した場合等においても以降の貯湯槽の温度をより正確に推定することができ、同様に適切なタイミングで効率よくヒートポンプを運転することができる。 Further, the primary side circulation circuit since the temperature detecting means provided in the heat exchanger outlet side can control the compressor, the hot water supply by even later in such a case where a relatively low temperature of fresh water from the lower flowing can estimate the temperature of the hot water storage tank more accurately, can be operated efficiently heat pump in a similar appropriate timings.

第3の発明は、流入温度検知手段による検知温度が限界所定温度に達したときに圧縮機を停止する請求項2記載の給湯装置である。 The third invention is a hot water supply device according to claim 2, wherein for stopping the compressor when the temperature detected by the inlet temperature detecting means reaches the limit prescribed temperature.

これによって、流入温度検知手段による検知温度は、水−冷媒熱交換器へ流入する水温に大きく影響を及ぼす温度であるため、あらかじめ早い段階で圧縮機を停止することにより、ヒートポンプ効率の比較的低い条件での沸き上げを予防することができる。 Thereby, the temperature detected by the inlet temperature sensing means, water - because it is greatly influences the temperature of the water temperature flowing into the refrigerant heat exchanger, by stopping the compressor in advance an early stage, a relatively low heat pump efficiency it is possible to prevent the boiling of the condition.

第4の発明は、貯湯槽に貯えられる温水の熱量を測定する熱量測定手段を備え、循環ポンプの動作中に、温度検知手段により検出される温度変化率と、前記熱量測定手段により測定される貯湯槽の蓄熱量に応じて圧縮機を制御する請求項1記載の給湯装置である。 The fourth invention is measured with a calorimetric means for measuring the amount of heat of the hot water to be stored in the hot water storage tank, during operation of the circulation pump, the temperature change rate detected by the temperature detecting means, by the calorimetry means a hot water supply apparatus according to claim 1, wherein for controlling the compressor in accordance with the amount of stored heat of the hot water storage tank.

これによって、放熱手段の連続運転や給湯等によりタンク上部にまで中温水が達する可能性がある状況においても、貯湯槽における総熱容量を算出することで、今後の使用湯量を推定したうえで適切なタイミングで効率よく必要湯量を沸き増しすることができるので、湯切れや放熱手段の運転の停止といった使用者の不便を防ぐことができる。 Thus, even in the continuous operation or circumstances that can lead to the medium-temperature water reaches the top of the tank by the hot water supply or the like of the heat radiating means, by calculating the total heat capacity of the hot water storage tank, suitable in terms of estimated future use hot water it is possible to increase the boiling efficiently requires hot water at the time, it is possible to prevent the inconvenience of a user such as stop of the operation of the hot water out and heat radiation means.

第5の発明は、熱量測定手段により測定される熱量が所定値に達したとき圧縮機を停止する請求項4記載の給湯装置である。 A fifth invention is a hot water supply device according to claim 4, wherein the stopping of the compressor when the amount of heat that is measured by calorimetry means reaches a predetermined value.

これによって、必要な湯量だけを確実に沸き上げし、さらにヒートポンプ効率の比較的低い条件で不必要な沸き増しを行うことがなくなるので効率よくヒートポンプを運転することができる。 Thus, by boiling only hot water necessary to ensure, it can further be operated efficiently heat pump since it is unnecessary to perform additional boiling unnecessary at a relatively low condition of the heat pump efficiency.

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。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 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。 It should be understood that the present invention is not limited by the embodiments. また、実施の形態で具体的に示す温度もこれを指定するものではない。 Also, it does not specify this also the temperature shown specifically in the embodiment.

(実施の形態1) (Embodiment 1)
図1は、本発明の第1の実施の形態における給湯装置の図を示すものである。 Figure 1 shows a diagram of a water heater in the first embodiment of the present invention.

図1において、2は水または加熱された湯を蓄えるための貯湯槽である。 1, 2 is a hot water tank for storing water or heated water. 貯湯槽2には複数の配管が接続されており、循環ポンプ3により水−冷媒熱交換器5へ送られた水は圧縮機1を備えるヒートポンプ回路により加熱される。 The hot water storage tank 2 is connected to a plurality of pipes, the water by a circulating pump 3 - water sent to the refrigerant heat exchanger 5 is heated by the heat pump circuit comprising a compressor 1. 貯湯槽2に蓄えられた湯は、ふろ16への給湯や、放熱手段13(例えば、床暖房や浴室乾燥機など)により利用される。 The hot water stored in the hot water storage tank 2, and hot water to the bath 16, is utilized by the heat dissipating unit 13 (e.g., floor heating or bathroom dryers, etc.). 貯湯槽2の上部からは放熱手段13へ放熱するための1次側循環回路10が備えられており、1次側循環ポンプ12により貯湯槽2に蓄えた湯が放熱手段用熱交換器11へ送られる。 From the top of the hot water tank 2 is provided with a primary side circulation circuit 10 for radiating the heat dissipating unit 13, the hot water stored in the hot water storage tank 2 by the primary side circulation pump 12 to the heat means heat exchanger 11 Sent. 熱交換器11には2次側循環回路14が接続されており、2次側循環ポンプ15により放熱手段用熱交換器11で受け取った熱を放熱手段13へと放熱することができる構成となっている。 The heat exchanger 11 is connected to the secondary circulation circuit 14, a configuration that can be dissipated to the heat dissipating unit 13 heat received by radiation means for heat exchanger 11 to the secondary side circulation pump 15 ing. また、貯湯槽下部に配置された貯湯槽下部温度検知手段9による検知温度から算出した温度変化率をもとに制御手段8により圧縮機1を制御することができる。 Further, it is possible to control the compressor 1 by the control unit 8 based on the temperature change rate calculated from the temperature detected by the hot water storage tank bottom temperature detecting means 9 arranged on the lower hot water storage tank.

以上のように構成された給湯装置の動作・作用について、以下図2のフローチャートを用いて説明する。 The operation and function of the configured water heater as described above will be described with reference to the following flowcharts FIG.

まず、1次側循環ポンプが動作しているかどうかを確認する(ステップS1)。 First checks whether the primary side circulation pump is operating (Step S1). ただしこれは連続運転に限定せず、例えば床暖房では温度制御により安定時にはONとOFFの繰り返しになることもあるため、そのような間欠運転の場合にも1次側循環ポンプを動作中と判断する場合も含むものとする。 However, this is not limited to continuous operation, for example because in floor heating, sometimes becomes the repetition of ON and OFF during stable with temperature control, determines that in operation the primary side circulation pump in the case of such intermittent operation also intended to include the case of. 1次側循環ポンプが動作中でない場合は、他制御に基づいた通常運転へと移行、またはその運転を継続する(ステップS2)。 If the primary side circulation pump is not in operation, the process proceeds to normal operation based on the other control, or continues its operation (step S2).

次に、1次側循環ポンプが動作中の場合、当日に湯の沸き増しが必要かどうかということを、前日までの実績や学習機能等から判断する(ステップS3)。 Then, the primary side circulation pump may in operation, that is whether hot water reheating is necessary on the day, judging from experience and training functions of the previous day (step S3). 当日の沸き増しが不必要の場合、他制御に基づいた通常運転へと移行、またはこれまでの運転を継続する(ステップS2)。 If the day of the reheating is unnecessary, transition to the normal operation based on the other control, or continue to operate far (Step S2). 沸き増し運転が必要と判断すると、貯湯槽下部温度検知手段9により貯湯槽下部温度T1を検知し(ステップS4)、T1が所定温度に達しているかどうかを判断する(ステップS4)。 When reheating operation is deemed necessary, the hot water tank bottom temperature detecting means 9 detects a hot water storage tank lower temperature T1 (step S4), T1 determines whether the reached a predetermined temperature (step S4). T1が所定温度以上(例えばT1≧70℃)のときは、他制御に基づいた通常運転へと移行、またはこれまでの運転を継続する。 T1 is the time over a predetermined temperature (e.g., T1 ≧ 70 ° C.), shifts to the normal operation based on the other control, or continue to operate far. これは、貯湯槽2には十分な湯量があると判断することができ、さらには、この条件においてヒートポンプにより加熱運転を行おうとしても効率が低くなってしまうためである。 This can be determined that the hot water tank 2 has enough hot water, and further, because the thus efficiency becomes lower even attempt to heating operation by the heat pump in this condition. また、T1が所定温度未満(例えばT1<70℃)のとき、貯湯槽下部温度検知手段9による検知温度から温度変化率αを算出する。 Further, T1 is time lower than the predetermined temperature (e.g., T1 <70 ℃), calculates the temperature change rate α from the temperature detected by the hot water storage tank bottom temperature detecting means 9. ここで温度変化率αとは、ある一定時間t(例えばt=30秒)の間の、貯湯槽下部温度検知手段9により検知される貯湯槽下部の温度変化量ΔT1と定義する。 Here, the temperature change rate alpha, defined as a certain time t (for example t = 30 seconds) between the hot water storage tank lower part of the temperature change amount ΔT1 sensed by the hot water storage tank bottom temperature detecting means 9. つまり、温度変化率α=ΔT1/tと表すことができ、例えば過去30秒間に貯湯槽下部温度検知手段9による検知温度T1が40℃から55℃に変化したとすると、このときの温度変化率αは、α=(55−40)/30=0.5と算出される。 In other words, it can be expressed as temperature coefficient α = ΔT1 / t, for example, the last 30 seconds hot water storage tank temperature T1 detected by the lower temperature sensing means 9 is to have changed to 55 ° C. from 40 ° C., a temperature change rate at this time alpha is calculated as α = (55-40) /30=0.5. そこでさらに、貯湯槽下部温度T1と温度変化率αの条件を判断し(ステップS7〜ステップS10)、圧縮機の周波数の制御、または運転の停止を行う(ステップS11〜ステップS14)。 Therefore further determines hot water storage tank condition of the lower temperature T1 and the temperature change rate alpha (step S7~ step S10), and performs the stop control, or operating frequency of the compressor (step S11~ step S14).

以下そのステップについて具体例を示す。 Hereinafter a specific example for that step.

まず貯湯槽下部温度T1の温度が比較的低く(例えばT1<30℃)、かつその温度が上昇している場合(α≧0)、圧縮機の周波数をUP、または最大加熱能力での運転を行う。 First the temperature of the hot water storage tank lower temperature T1 is relatively low (e.g., T1 <30 ° C.), and if the temperature is rising (alpha ≧ 0), the operation of the frequency of the compressor UP or maximum heating capacity, do. これは、今後ヒートポンプにより沸き増しを行う場合、条件から入水温度の上昇が予想される。 This is expected to rise in the incoming water temperature when, from the condition for performing increasing boiling by the heat pump future. つまり、ヒートポンプとしては効率が下がっていく方向であるため、少しでも効率のよい条件でより多くの沸き増しを済ませてしまおうというものである。 In other words, as the heat pump for efficiency is going down direction, it is that Let's finish more of reheating in efficient conditions even a little.

次に、貯湯槽下部温度T1の温度が比較的低く(例えばT1<30℃)、かつその温度が下降している場合(α<0)、今後もある程度効率のよい沸きまし運転が期待できる。 Then, the temperature of the hot water storage tank lower temperature T1 is relatively low (e.g., T1 <30 ° C.), and if the temperature is falling (alpha <0), can be expected operation has boiling good to some extent the efficiency in the future. よって、その環境条件においてCOP(成績係数=加熱能力/消費電力)が最適になる圧縮機周波数にて運転を行う。 Therefore, performing the operation by the compressor frequency in its environmental conditions COP (coefficient of performance = heating capability / power consumption) is optimal.

また、貯湯槽下部温度T1の温度が中温域にあり(例えば30℃≦T1<70℃)、かつその温度が上昇している場合(α≧0)、圧縮機の周波数をDOWN、あるいは圧縮機の運転を一時的に停止する。 Also, when the temperature of the hot water tank bottom temperature T1 is in the intermediate temperature range (e.g., 30 ℃ ≦ T1 <70 ℃), and its temperature is elevated (alpha ≧ 0), the frequency of the compressor DOWN or compressor, to temporarily stop the operation. これは、入水温度は中温域でヒートポンプの効率は比較的それほど高くはないものの、湯量が不十分になることが予想される場合は圧縮機の周波数をDOWNさせることで効率低下を防いだり、一定時間圧縮機の運転を停止することで温度変化率αが給湯などにより反転(α<0)してから運転できるようにする。 This, although the incoming water temperature efficiency of the heat pump in a medium temperature range is relatively so high no Dari prevent efficiency decrease by causing DOWN frequency of the compressor when it is expected that hot water is insufficient, a certain time rate of temperature change by stopping the operation of the compressor alpha is to be operated from the inverted (α <0) or the like hot water.

最後に、貯湯槽下部温度T1が中温域にあり(例えば30℃≦T1<70℃)、かつその温度が下降している場合は(α<0)、時間をおくことで効率のよい温度域での運転ができる期待がある。 Finally, if the hot water storage tank lower temperature T1 is in the intermediate temperature range (e.g., 30 ℃ ≦ T1 <70 ℃), and its temperature is lowered in (alpha <0), a good temperature range efficiency by placing the time there is an expectation that can be operated in. そのため、とりあえずは圧縮機の周波数をDOWNさせて比較的効率の高い条件で沸き増しをしたり、またはT1が十分に下がることが期待できる場合には、T1が所定の温度未満(たとえばT1<30℃)になるまで圧縮機を停止する。 Therefore, when the time being the or an increased boiling at a relatively high efficiency conditions by DOWN the frequency of the compressor, or T1 can be expected may fall sufficiently, T1 is lower than a predetermined temperature (e.g., T1 <30 until ° C.) to stop the compressor.

以上のように圧縮機の制御を行いながら、定期的に、または連続的にT1の温度を検知し、さらには温度変化率αを計算することでより効率のよい条件での沸き増し運転を行うことができる。 While control of the compressor as described above, periodically or continuously detecting a temperature of T1, further performs the additional boiling operation in a more efficient conditions by calculating the temperature change rate α be able to.

(実施の形態2) (Embodiment 2)
図2は、本発明の第2の実施の形態における給湯装置の図を示すものである。 Figure 2 shows a diagram of a water heater according to the second embodiment of the present invention.

図2において、1次側循環回路10上の、貯湯槽2の下部に流入する箇所に貯湯槽下部流入温度検知手段17が取り付けられ、放熱手段用熱交換器11により放熱されてできた中温水の温度(貯湯槽に流入する温度T2)を検知することができる構成となっている。 In Figure 2, on the primary side circulation circuit 10, the hot water storage tank lower inlet temperature detecting means 17 at a location that flows into the lower portion of the hot water storage tank 2 is mounted, hot water in which Deki is radiated by the radiation unit heat exchanger 11 temperature has a structure which can be detected (temperature T2 flowing into the hot water storage tank). 他の箇所については図1と同様の構成である。 The other portion is the same configuration as FIG.

以上のように構成された給湯装置について、以下その動作、作用を説明する。 The constructed hot water supply apparatus as described above, the following operation will be explained.

ステップS5までの動作に関しては実施の形態1と同様であるため省略する。 For the operation up to step S5 is omitted because it is similar to the first embodiment. ステップS5においてT1が高温水でない場合(たとえばT1<70℃)、貯湯槽下部流入温度T2を検知する(ステップS5−2)。 T1 in step S5 may not be hot water (eg T1 <70 ° C.), for detecting a hot water tank bottom inlet temperature T2 (step S5-2). T1は貯湯槽下部の温度に影響を及ぼす温度であり、つまり同時にヒートポンプの運転効率に対して影響をもつため、T2の温度を含め圧縮機の制御を行うことは有効である。 T1 is temperature affect the temperature of the lower hot water storage tank, since it has an effect on the operating efficiency of the words at the same time the heat pump, it is effective for controlling the compressor, including the temperature of T2. またT2は中温域(たとえば40℃〜60℃)で安定している場合が多く、T1のように給湯による新鮮水の流入で急激に温度変化することもあまりないのが特徴である。 The T2 is often stabilized at intermediate temperatures (e.g. 40 ° C. to 60 ° C.), it is also characterized by not much to temperature changes abruptly in the inflow of fresh water by the hot water supply as T1. そこで、T2が比較的高温で安定した場合(例えばT2>50℃で60秒間安定)、タンクには今後も比較的高温の湯が流入していくことが推定される。 Therefore, if T2 is relatively stable at elevated temperatures (e.g., T2> 50 ° C. for 60 seconds stable), it is estimated that continue to flow into the relatively high-temperature hot water in the future in the tank. この条件は、例えば放熱手段が床暖房であり、連続運転により温度的に安定した場合などに考えられる。 This condition, for example, the heat dissipation means is a floor heating is considered or when a temperature stable by continuous operation. そしてその場合、圧縮機を停止するか、またはこれまでの運転を継続し、効率が低い条件でのヒートポンプの運転をあらかじめ制限してしまう。 In which case, either stop the compressor, or to continue the operation so far, the efficiency will advance limit operation of the heat pump at low conditions. また、T2が比較的低い場合(例えばT2≦50℃)には、実施の形態1同様に温度変化率αの算出(ステップ6)へと移行し、移行同様の動作を行う。 Also, if T2 is relatively low (e.g., T2 ≦ 50 ° C.), the operation proceeds to calculation of the Embodiment 1 similarly temperature coefficient α embodiment (Step 6), the transition similar operation.

(実施の形態3) (Embodiment 3)
図3は、本発明の第3の実施の形態における給湯装置の図を示すものである。 Figure 3 shows a diagram of a water heater according to the third embodiment of the present invention.

図3において、貯湯槽2には貯湯槽下部温度検知手段9を含む熱量測定手段18が備えられ、それらにより検知された温度から貯湯槽2の蓄熱容量を算出できる構成としている。 3, the hot water storage tank 2 is provided with a calorimetric device 18 comprising a hot water tank bottom temperature detecting means 9, from the temperature sensed by their configured to be capable of calculating the heat storage capacity of the hot water storage tank 2. 熱量測定手段18については、その検知方法は特に限定せず、例えばここではサーミスタ(温度検知手段)であるものとする。 The calorimetric means 18, the detection method is not particularly limited, for example, assumed here is a thermistor (temperature detecting means). また他の箇所については、図1と同様の構成である。 With respect to the other portions, the same configuration as FIG.

以上のように構成された給湯装置について、以下その動作、作用を説明する。 The constructed hot water supply apparatus as described above, the following operation will be explained.

ステップS1において1次側循環ポンプがONであると判断した場合、熱量検知手段18により貯湯槽2の蓄熱容量を測定する(ステップS1−2)。 If the primary side circulation pump in step S1 is judged to be ON, the measured heat storage capacity of the hot water tank 2 by heat detection means 18 (step S1-2). 例えば、貯湯槽2の側面に設置されたサーミスタ(温度検知手段)で貯湯槽2内の湯の温度を検知し、貯湯槽2内の総蓄熱量を算出する。 For example, to detect the temperature of the hot water in the hot water tank 2 by a thermistor placed on the side surface of the hot water storage tank 2 (temperature sensing means), calculates the total amount of heat stored in the hot water tank 2. その総蓄熱量と前日までの実績や学習機能によるデータとを比較することで、今後沸き増しが必要かどうかをより正確に判断することができる。 By comparing the data by the experience and learning function of up to the total amount of stored heat and the day before, it can be determined whether it is necessary to reheating the future more accurately. これにより、無駄な沸き増しをする必要がなくなる。 As a result, the need to be there is no unnecessary additional boiling.

そして、ステップS4以降は実施の形態1と同様に動作するものとする。 Then, after step S4 is assumed to operate in the same manner as the first embodiment. これらの動作により、必要な湯量だけを確実に沸き上げし、さらにヒートポンプ効率の比較的低い条件で不必要な沸き増しを行うことがなくなるので効率よくヒートポンプを運転することができる。 By these operations, and boiled only hot water necessary to ensure, it can further be operated efficiently heat pump since it is unnecessary to perform additional boiling unnecessary at a relatively low condition of the heat pump efficiency.

以上のように、本発明にかかる給湯装置は、必要な湯量だけを確実に沸き上げし、さらにヒートポンプ効率の比較的低い条件で不必要な沸き増しを行うことがなくなるので、床暖房等の放熱手段を備えたものだけでなく、ふろの追い炊き機能を備えたもの等、貯湯槽内に中温水が生成される可能性がある給湯装置に利用することができる。 As described above, the water heater according to the present invention is to boiling only hot water necessary to ensure, since further it is unnecessary to perform increasing boiling unnecessary at a relatively low condition of the heat pump efficiency, heat dissipation of floor heating, etc. not just those with means can be utilized such as those having a reheating function of bath, the water heater that may be medium-temperature water is generated in the hot water storage tank.

本発明の実施の形態1における給湯装置の構成図 Configuration diagram of a water heater in the first embodiment of the present invention 本発明の実施の形態1における動作を示したフローチャート Flowchart illustrating the operation of the first embodiment of the present invention 本発明の実施の形態2における給湯装置の構成図 Configuration diagram of a water heater according to the second embodiment of the present invention 本発明の実施の形態2における動作を示したフローチャート Flowchart illustrating the operation of the second embodiment of the present invention 本発明の実施の形態3における給湯装置の構成図 Configuration diagram of a water heater according to a third embodiment of the present invention 本発明の実施の形態3における動作を示したフローチャート Flowchart illustrating the operation of the third embodiment of the present invention 従来の給湯装置の構成図 Block diagram of a conventional water heater

符号の説明 DESCRIPTION OF SYMBOLS

1 圧縮機 2 貯湯槽 3 循環ポンプ 4 貯湯槽上部温度検知手段 5 水−冷媒熱交換器 6 貯湯槽上部流入温度温度検知手段 7 運転制御器 8 制御手段 9 貯湯槽下部温度検知手段 10 1次側循環回路 11 放熱手段用熱交換器 12 1次側循環ポンプ 13 放熱手段 14 2次側循環回路 15 2次側循環ポンプ 16 ふろ 17 貯湯槽下部流入温度検知手段 18 熱量測定手段 1 compressor 2 hot water storage tank 3 circulating pump 4 the hot water tank upper temperature detecting means 5 water - refrigerant heat exchanger 6 the hot water storage tank upper inlet temperature temperature detecting means 7 operation controller 8 controller 9 hot water tank bottom temperature detecting means 10 primary circulation circuit 11 radiating means for heat exchanger 12 the primary side circulation pump 13 heat dissipating means 14 secondary circulation circuit 15 secondary circulation pump 16 bath 17 hot water storage tank lower inlet temperature detecting means 18 calorimetry means

Claims (5)

  1. 貯湯槽と、圧縮機を備えるヒートポンプ回路と、前記貯湯槽の上部から出湯して放熱手段用熱交換器を介して前記貯湯槽に戻す1次側循環回路と、前記放熱手段用熱交換器を介して放熱手段に接続する2次側循環回路と、1次側循環回路に設けられた1次側循環ポンプと、貯湯槽の下部に設けられた貯湯槽下部温度検知手段とを備え、前記1次側循環ポンプの動作中に、前記貯湯槽下部温度検知手段による温度から算出した温度変化率に応じて圧縮機を制御する給湯装置。 And the hot water storage tank, a heat pump circuit including a compressor, a primary circulation circuit for returning the hot water storage tank via the heat exchanger for heat dissipation means by tapping the top of the hot water storage tank, a heat exchanger for the heat radiation means includes a secondary circulation circuit connected to the radiating means through a primary circulation pump provided on the primary side circulation circuit, and a hot water tank bottom temperature detecting means provided in the lower portion of the hot water storage tank, the 1 during operation of the next side circulation pump, the hot water supply device for controlling a compressor according to the temperature change rate calculated from the temperature by the hot water storage tank lower temperature detecting means.
  2. 放熱手段用熱交換器から貯湯槽へ流入する温水温度を検知する貯湯槽下部流入温度検知手段を備え、1次側循環ポンプの動作中に、温度検知手段により検知される温度変化率と、かつ前記流入温度検知手段による検知温度に応じて圧縮機を制御する請求項1記載の給湯装置。 Comprising a hot water tank bottom inlet temperature detecting means for detecting the temperature of hot water flowing from the heat exchanger for heat radiation means to the hot water storage tank, during operation of the primary side circulation pump, the temperature change rate is detected by the temperature detecting means, and hot water supply device according to claim 1 for controlling a compressor in accordance with the temperature detected by the inlet temperature detecting means.
  3. 貯湯槽下部流入温度検知手段による検知温度が限界所定温度に達したときに圧縮機を停止する請求項2記載の給湯装置。 Hot water supply apparatus according to claim 2, wherein the temperature detected by the hot water storage tank lower inlet temperature detecting means stops the compressor when it reaches the limit prescribed temperature.
  4. 貯湯槽に貯えられる温水の熱量を測定する熱量測定手段を備え、1次側循環ポンプの動作中に、温度検知手段により検出される温度変化率と、前記熱量測定手段により測定される貯湯槽の蓄熱量に応じて圧縮機を制御する請求項1記載の給湯装置。 Comprising a heat measurement means for measuring the amount of heat of the hot water to be stored in the hot water storage tank, during operation of the primary side circulation pump, the temperature change rate detected by the temperature detecting means, a hot water tank that is measured by the calorimetric means hot water supply device according to claim 1 for controlling a compressor in accordance with the amount of stored heat.
  5. 熱量測定手段により測定される熱量が所定値に達したとき圧縮機を停止する請求項4記載の給湯装置。 Hot water supply device according to claim 4, wherein stopping the compressor when the amount of heat that is measured by calorimetry means reaches a predetermined value.
JP2005170642A 2005-06-10 2005-06-10 Hot water supply apparatus Pending JP2006343058A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011129248A1 (en) * 2010-04-15 2011-10-20 三菱電機株式会社 Controller for water heater system, program for controlling water heater system, and method for operating water heater system
JP2015194299A (en) * 2014-03-31 2015-11-05 ダイキン工業株式会社 Water heater

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011129248A1 (en) * 2010-04-15 2011-10-20 三菱電機株式会社 Controller for water heater system, program for controlling water heater system, and method for operating water heater system
CN102893097A (en) * 2010-04-15 2013-01-23 三菱电机株式会社 Controller for water heater system, program for controlling water heater system, and method for operating water heater system
JP5389257B2 (en) * 2010-04-15 2014-01-15 三菱電機株式会社 Hot water supply system control device and the hot water supply system control program and hot water system operating method
CN102893097B (en) * 2010-04-15 2015-08-05 三菱电机株式会社 Hot water supply system and hot water supply system control device control program, and method of operating a hot water supply system
US9562696B2 (en) 2010-04-15 2017-02-07 Mitsubishi Electric Corporation Hot water supply system control apparatus and hot water supply system control program and hot water supply system operating method
JP2015194299A (en) * 2014-03-31 2015-11-05 ダイキン工業株式会社 Water heater

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