JP4389566B2 - Water heater - Google Patents
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- JP4389566B2 JP4389566B2 JP2003404618A JP2003404618A JP4389566B2 JP 4389566 B2 JP4389566 B2 JP 4389566B2 JP 2003404618 A JP2003404618 A JP 2003404618A JP 2003404618 A JP2003404618 A JP 2003404618A JP 4389566 B2 JP4389566 B2 JP 4389566B2
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Description
この発明は、給湯装置に関し、特に浴槽や台所等への給湯が可能な貯湯タンクを備えた給湯装置に関するものである。 The present invention relates to a hot water supply apparatus, and more particularly to a hot water supply apparatus provided with a hot water storage tank capable of supplying hot water to a bathtub, a kitchen or the like.
給湯装置として、従来から貯湯タンクを備えたものがある（例えば、特許文献１参照）。この給湯装置における浴槽又は台所等への給湯は、貯湯タンクの下部に供給される水圧で湯が押上げられ、出湯管（給湯管）を介して行うことになる。また貯湯タンクの湯を浴槽へ供給する湯張りを行った後は、浴槽に連結された循環路内をこの浴槽内の湯を循環させて、所定温度以下となれば、この循環路に介設された電気ヒータ等にて循環路内を循環している湯を暖めて浴槽の湯を保温するものである。
しかしながら、給湯を行う場合、上記特許文献１の電気ヒータを使用した電気給湯機（温水器）や、ヒートポンプ式加熱源を使用したヒートポンプ式給湯機では、給湯圧力が低い場合があり、このようなときには、台所での蛇口や浴室等でのシャワーからの時間あたりの出湯量が少なく、使用者にとっては使いずらいものとなる。このため、従来では、給湯圧力を上げるために、別途出湯出口側に給湯加圧用ポンプを配置することもあった。 However, in the case of performing hot water supply, in the electric water heater (water heater) using the electric heater of Patent Document 1 and the heat pump hot water heater using a heat pump heating source, the hot water supply pressure may be low. Sometimes, the amount of hot water per hour from a shower in a kitchen faucet or bathroom is small, making it difficult for the user to use. For this reason, conventionally, in order to increase the hot water supply pressure, a hot water supply pressurizing pump is sometimes separately provided on the outlet side of the hot water.
ところが、給湯加圧用ポンプの取付作業は、この給湯機の施工時（据付時）に行うことになる。すなわち、給湯加圧用ポンプは給湯機としての製品を構成するものではなく、製品に別途この給湯加圧用ポンプを取付ける必要がある。そのため、ポンプ用のスペースを必要とし、しかも、施工工数が増加すると共に、コスト高となっていた。 However, the hot water supply pressurizing pump is attached at the time of installation (installation) of the water heater. That is, the hot water supply pressurizing pump does not constitute a product as a hot water supply machine, and it is necessary to attach this hot water supply pressurizing pump separately to the product. Therefore, a space for the pump is required, and the number of construction steps is increased and the cost is high.
この発明は、上記従来の欠点を解決するためになされたものであって、その目的は、台所等への給湯を安定した給湯圧力で行うことができ、しかもコスト低減を図ることが可能な給湯装置を提供することにある。 The present invention has been made to solve the above-described conventional drawbacks, and an object of the present invention is to provide hot water supply that can perform hot water supply to a kitchen or the like with a stable hot water supply pressure and can reduce costs. To provide an apparatus.
そこで請求項１の給湯装置は、貯湯タンク１の上部に出湯路１３を、また下部に水道水供給路をそれぞれ接続し、出湯路１３を介して浴槽２及び浴槽２以外の台所等に水道水供給路からの水圧で給湯する給湯運転を行うことが可能な給湯装置であって、貯湯タンク１の上部の高温湯を、貯湯タンク１の下部に返流させる循環路１４を設けると共に、この循環路１４に上流側から順に循環ポンプ１８と外部熱交換器２０とを介設し、循環ポンプ１８の駆動により外部熱交換器２０において、高温水と浴槽２内の湯との熱交換を行う追い焚き運転を可能にし、また、上記循環路１４における循環ポンプ１８と外部熱交換器２０との間の位置と上記出湯路１３とを切換手段Ｓを介して連結し、上記切換手段Ｓの一方への切換時に、台所等への給湯の際に上記循環ポンプ１８の駆動による給湯加圧運転を行うことを可能とし、上記切換手段Ｓの他方への切換時に、上記追い焚き運転と共に、水道水供給路からの水圧により台所等へ給湯する給湯運転を行うことを可能としたことを特徴としている。
Therefore hot water supply apparatus according to claim 1, the hot water passage 13 to the upper portion of the hot water storage tank 1, also tap water supply channel is connected to the lower tap water in the kitchen or the like other than the tub 2 and tub 2 via a tapping line 13 A hot water supply apparatus capable of performing a hot water supply operation in which hot water is supplied with water pressure from a supply path, and is provided with a circulation path 14 for returning the high temperature hot water in the upper part of the hot water storage tank 1 to the lower part of the hot water storage tank 1 and this circulation. A circulation pump 18 and an external heat exchanger 20 are provided in order from the upstream side of the passage 14, and the external heat exchanger 20 is configured to exchange heat between the high-temperature water and hot water in the bathtub 2 by driving the circulation pump 18. Further, it is possible to perform a whirling operation, and the position between the circulation pump 18 and the external heat exchanger 20 in the circulation path 14 and the hot water discharge path 13 are connected via the switching means S to one of the switching means S. Of hot water supply to the kitchen, etc. The hot water supply pressurization operation by driving the circulation pump 18 can be performed, and when the switching means S is switched to the other, the reheating operation and the hot water supply to the kitchen etc. by the water pressure from the tap water supply path are performed. It is characterized by enabling driving .
上記請求項１の給湯装置では、台所等への給湯時に上記循環用ポンプ１８の駆動による給湯加圧を行うので、この給湯時における給湯加圧不足を解消することができる。また、このような給湯加圧には、追い焚き運転に使用する循環用ポンプ１８を使用するものであり、加圧用のポンプを別途設ける必要がない。しかも、ふろ追い焚き運転のためにヒータ等の加熱源を必要としない。 In the hot water supply apparatus of the first aspect, since hot water pressurization is performed by driving the circulation pump 18 when hot water is supplied to a kitchen or the like, the lack of hot water pressurization during hot water supply can be solved. In addition, the hot water supply pressurization uses the circulation pump 18 used for the reheating operation, and it is not necessary to separately provide the pressurization pump. In addition, a heating source such as a heater is not required for the chasing operation.
また、上記給湯装置では、追い焚き運転時において、循環用ポンプ１８の駆動による給湯加圧を行わない台所等への給湯を可能としたので、追い焚き運転時における循環用ポンプ１８による循環路１４内での湯の循環を安定して行うことができる。
Further, in the hot water supply apparatus, hot water supply to a kitchen or the like in which hot water supply pressurization is not performed by driving the circulation pump 18 is possible during the reheating operation, and therefore the circulation path 14 by the circulation pump 18 during the reheating operation. The circulation of hot water inside can be performed stably.
請求項２の給湯装置は、上記切換手段Ｓに三方弁２３を使用することを特徴としている。
The hot water supply apparatus according to claim 2 is characterized in that a three-way valve 23 is used for the switching means S.
上記請求項２の給湯装置では、切換手段Ｓに三方弁２３を使用するので、切換操作を簡単にかつ確実行うことができる。
In the hot water supply apparatus of the second aspect , since the three-way valve 23 is used for the switching means S, the switching operation can be performed easily and reliably.
請求項１の給湯装置によれば、給湯時における給湯加圧不足を解消することができるので、給湯不足になることなく、使用者は安定した出湯量の湯を使用することができる。また、このような給湯加圧には、追い焚き運転に使用する循環用ポンプを使用するものであり、加圧用のポンプを別途設ける必要がない。このため、施工時における加圧用のポンプ等の取付作業がなく、施工時間の短縮を図ると共に、ポンプ用のスペースの確保も必要がなく、さらにはコストの低減を達成できる。ふろ追い焚き運転のために別途ヒータ等の加熱源を必要とせず、低コスト化を図ることができる。 According to the hot water supply apparatus of the first aspect, since the lack of hot water supply during hot water supply can be solved, the user can use a stable amount of hot water without shortage of hot water supply. In addition, for such hot water supply pressurization, a circulation pump used for the reheating operation is used, and it is not necessary to separately provide a pressurization pump. For this reason, there is no attachment work of the pressurization pump etc. at the time of construction, it is possible to shorten the construction time, it is not necessary to secure a space for the pump, and further reduction in cost can be achieved. A separate heating source such as a heater is not required for the bathing operation, and the cost can be reduced.
また、上記給湯装置によれば、追い焚き運転時における循環用ポンプによる循環路内での湯の循環を安定して行うことができる。このため、追い焚き運転の信頼性を損なわずに安定した運転（追い焚き運転）を行うことができる。
Moreover, according to the said hot water supply apparatus, the circulation of the hot water in the circulation path by the circulation pump at the time of reheating operation can be performed stably. For this reason, it is possible to perform a stable operation (a chasing operation) without impairing the reliability of the chasing operation.
請求項２の給湯装置によれば、切換手段に三方弁を使用するので、切換操作を簡単にかつ確実に行うことができ。このため、切換操作が安定して、使用状況に応じて最適な状態で運転することができる。
According to the hot water supply apparatus of the second aspect , since the three-way valve is used as the switching means, the switching operation can be performed easily and reliably. For this reason, the switching operation is stable, and the vehicle can be operated in an optimum state according to the use situation.
次に、この発明の給湯装置の具体的な実施の形態について、図面を参照しつつ詳細に説明する。図１は給湯装置の要部簡略図である。この給湯装置は、貯湯タンク１を備え、この貯湯タンク１の湯を浴槽２に供給（給湯）したり、台所やシャワーに供給（給湯）したりすることができる。 Next, specific embodiments of the hot water supply apparatus of the present invention will be described in detail with reference to the drawings. FIG. 1 is a simplified view of a main part of a hot water supply apparatus. This hot water supply apparatus includes a hot water storage tank 1 and can supply (hot water supply) hot water in the hot water storage tank 1 to the bathtub 2 or supply (hot water supply) to a kitchen or a shower.
この場合、図２に示す冷凍サイクル３を有する熱源ユニット４を使用して、貯湯タンク１に湯を溜めるものである。冷凍サイクル３は、圧縮機５と、水熱交換器６と、膨張弁７と、蒸発器８とを順に接続して構成される。そして、貯湯タンク１に循環路９が連結され、この循環路９に、水循環用ポンプ１０と熱交換路１１とが介設されている。この場合、熱交換路１１は水熱交換器６にて構成される。 In this case, hot water is stored in the hot water storage tank 1 using the heat source unit 4 having the refrigeration cycle 3 shown in FIG. The refrigeration cycle 3 is configured by connecting a compressor 5, a water heat exchanger 6, an expansion valve 7, and an evaporator 8 in this order. A circulation path 9 is connected to the hot water storage tank 1, and a water circulation pump 10 and a heat exchange path 11 are interposed in the circulation path 9. In this case, the heat exchange path 11 is constituted by the water heat exchanger 6.
このため、圧縮機５を駆動すると共に、水循環用ポンプ１０を駆動すると、貯湯タンク１の底部に設けた取水口から貯溜水（温水）が循環路９に流出し、これが熱交換路１１を流通する。そのときこの温水は水熱交換器６によって加熱され（沸上げられ）、湯入口から貯湯タンク１の上部に返流される。これによって、貯湯タンク１に高温の温水を貯めるものである。 For this reason, when the compressor 5 is driven and the water circulation pump 10 is driven, the stored water (warm water) flows out from the water intake provided at the bottom of the hot water storage tank 1 to the circulation path 9, and this flows through the heat exchange path 11. To do. At this time, the hot water is heated (boiling) by the water heat exchanger 6 and returned to the upper part of the hot water storage tank 1 from the hot water inlet. As a result, hot water is stored in the hot water storage tank 1.
また、貯湯タンク１には、図１に示すように、出湯路（出湯管）１３及び循環路１４が連結されている。出湯路１３は、貯湯タンク１の上部に接続される本体配管１５と、この本体配管１５から分岐部１６を介して分岐される分岐管１７ａ、１７ｂとを有する。一方の分岐管１７ａはふろ混合弁（図示省略）に接続され、他方の分岐管１７ｂは給湯混合弁（図示省略）に接続される。ここで、ふろ混合弁とは、貯湯タンク１からの湯と水道水とを混合して、その混合した温水を上記浴槽に給湯するものである。また、給湯混合弁とは、貯湯タンク１からの湯と水道水とを混合して、台所の蛇口や洗面所のシャワー等に給湯するものである。 In addition, as shown in FIG. 1, a hot water storage passage (hot water discharge pipe) 13 and a circulation passage 14 are connected to the hot water storage tank 1. The hot water outlet 13 has a main body pipe 15 connected to the upper part of the hot water storage tank 1, and branch pipes 17 a and 17 b branched from the main body pipe 15 via a branch portion 16. One branch pipe 17a is connected to a bath mixing valve (not shown), and the other branch pipe 17b is connected to a hot water supply mixing valve (not shown). Here, the bath mixing valve mixes hot water from the hot water storage tank 1 and tap water, and supplies the mixed hot water to the bathtub. The hot water supply mixing valve mixes hot water from the hot water storage tank 1 with tap water and supplies hot water to a kitchen faucet, a shower in a bathroom, and the like.
循環路１４は、循環用ポンプ１８と、外部熱交換器２０にて構成される熱交換路１９とが介設されている。すなわち、循環路１４は、熱交換路１９に貯湯タンク１の上部の湯を熱交換路１９に供給する流出路２１と、熱交換路１９から流出した湯を貯湯タンク１に戻す流入路２２とを有し、流出路２１に循環用ポンプ１８が介設されている。また、流出路２１には、後述する切換手段Ｓを構成する三方弁２３が介設されている。そして、この三方弁２３は接続路２４を介して上記出湯路１３の本体配管１５に接続されている。 The circulation path 14 is provided with a circulation pump 18 and a heat exchange path 19 constituted by an external heat exchanger 20. That is, the circulation path 14 includes an outflow path 21 for supplying hot water from the upper part of the hot water storage tank 1 to the heat exchange path 19 to the heat exchange path 19, and an inflow path 22 for returning hot water flowing out from the heat exchange path 19 to the hot water storage tank 1. The circulation pump 18 is interposed in the outflow path 21. Further, the outflow passage 21 is provided with a three-way valve 23 constituting switching means S described later. The three-way valve 23 is connected to the main body pipe 15 of the hot water supply path 13 through a connection path 24.
また、浴槽２には、追い焚き用循環路２６が接続されている。すなわち、追い焚き用循環路２６は、浴槽２に配置された接続用アダプタ２７を介して接続される往路配管２８と復路配管２９を備え、この往路配管２８と復路配管２９とは、上記外部熱交換器２０にて構成される熱交換路３０を介して接続されている。また、往路配管２８には循環用ポンプ３１が介設されている。 Further, a recirculation circuit 26 is connected to the bathtub 2. That is, the recirculation circuit 26 includes an outward piping 28 and a return piping 29 connected via a connection adapter 27 disposed in the bathtub 2, and the outward piping 28 and the return piping 29 are connected to the external heat pipe. It is connected via a heat exchange path 30 constituted by the exchanger 20. In addition, a circulation pump 31 is interposed in the forward piping 28.
このため、貯湯タンク１の湯が熱交換路１９に供給される流路となるように、切換手段Ｓを構成する上記三方弁２３を切換えて循環用ポンプ１８を駆動すると、図１の矢印Ａのように、貯湯タンク１の上部の高温の湯が流出路２１から熱交換路１９に流れ、この熱交換路１９から流入路２２を介して、貯湯タンク１に返流する。すなわち、循環路１４内を貯湯タンク１の湯が循環する。また、追い焚き用循環路２６の循環用ポンプ３１を駆動すると、図２の矢印Ｂのように、浴槽２の湯が往路配管２８から熱交換路３０に流れ、この熱交換路３０から復路配管２９を介して浴槽２に返流する。すなわち、追い焚き用循環路２６内を浴槽２の湯が循環する。そして、循環路１４の熱交換路１９を流れる貯湯タンク１からの湯と、追い焚き用循環路２６の熱交換路３０を流れる浴槽２からの湯とが熱交換を行って、この浴槽２からの湯が加熱されて浴槽２に戻る。このため、浴槽２の湯の追い焚き運転（ふろ追い焚き運転）を行うことができる。すなわち、この図１に示す状態では、ふろ混合弁を介しての浴槽２への給湯及び給湯混合弁を介しての台所等の蛇口からの出湯が停止した状態、つまり追い焚き単独運転を行っている。 Therefore, when the circulating pump 18 is driven by switching the three-way valve 23 constituting the switching means S so that the hot water in the hot water storage tank 1 becomes a flow path supplied to the heat exchange path 19, the arrow A in FIG. As described above, the hot water in the upper part of the hot water storage tank 1 flows from the outflow passage 21 to the heat exchange passage 19 and returns to the hot water storage tank 1 from the heat exchange passage 19 via the inflow passage 22. That is, the hot water in the hot water storage tank 1 circulates in the circulation path 14. When the circulation pump 31 of the recirculation circuit 26 is driven, the hot water in the bathtub 2 flows from the forward piping 28 to the heat exchange channel 30 as shown by an arrow B in FIG. It returns to the bathtub 2 via 29. That is, the hot water in the bathtub 2 circulates in the recirculation circuit 26. Then, the hot water from the hot water storage tank 1 flowing through the heat exchange path 19 of the circulation path 14 and the hot water from the bathtub 2 flowing through the heat exchange path 30 of the recirculation circulation path 26 exchange heat, and from this bathtub 2 The hot water is heated and returned to the bathtub 2. For this reason, the hot water reheating operation of the bathtub 2 can be performed. That is, in the state shown in FIG. 1, the hot water supply to the bathtub 2 through the bath mixing valve and the hot water supply from the faucet of the kitchen or the like through the hot water mixing valve are stopped, that is, the reheating independent operation is performed. Yes.
ところで、分岐管１７ｂを介しての台所等の蛇口からの出湯を行う状態（つまり、矢印Ｃのように貯湯タンク１の上部の湯が出湯管１３を流れて、蛇口等から出湯する状態であって、給湯状態）では、貯湯タンク１の下部に接続される図示省略の水道水供給路からの水圧で湯が押上げられることになる。この際、貯湯タンク１の湯が接続路２４に供給される流路となるように三方弁２３を切換えて循環用ポンプ１８を駆動すると、矢印Ｄのように貯湯タンク１から流出路２１に流出した湯は、接続路２４を介して出湯路１３の本体配管１５に流入する。このため、分岐管１７ｂを介しての台所等の蛇口からの出湯において、循環用ポンプ１８による給湯加圧運転を行うことができる。 By the way, the state in which the hot water from the faucet of the kitchen or the like is discharged via the branch pipe 17b (that is, the hot water in the upper part of the hot water storage tank 1 flows through the hot water pipe 13 as shown by arrow C and the hot water is discharged from the faucet or the like). In the hot water supply state), the hot water is pushed up by water pressure from a tap water supply path (not shown) connected to the lower part of the hot water storage tank 1. At this time, when the circulation pump 18 is driven by switching the three-way valve 23 so that the hot water in the hot water storage tank 1 becomes a flow path supplied to the connection path 24, the hot water tank 1 flows out into the outflow path 21 as indicated by an arrow D. The hot water flows into the main pipe 15 of the hot water outlet 13 through the connection path 24. For this reason, hot water pressurization operation by the circulation pump 18 can be performed in hot water from a faucet such as a kitchen via the branch pipe 17b.
また、この給湯装置においては、追い焚き運転中に、上記給湯状態としたり、給湯状態において追い焚き運転を行うようにしたりすることができる。すなわち、三方弁２３を図１に示す状態として、循環用ポンプ１８を駆動して追い焚き運転を行い、この状態で、台所等の蛇口を開状態とすれば、図４に示すように、貯湯タンク１からの湯が、出湯路１３を矢印Ｃのように流れ、給湯状態とすることができる。この際、循環用ポンプ１８による給湯加圧運転を行わない。 In this hot water supply apparatus, the hot water supply state can be set during the reheating operation, or the reheating operation can be performed in the hot water supply state. That is, when the three-way valve 23 is in the state shown in FIG. 1 and the circulating pump 18 is driven to perform a reheating operation, and the faucet of the kitchen or the like is opened in this state, as shown in FIG. Hot water from the tank 1 flows through the hot water outlet 13 as shown by an arrow C, and a hot water supply state can be obtained. At this time, hot water pressurizing operation by the circulation pump 18 is not performed.
上記給湯装置によれば、台所等への給湯時に上記循環用ポンプ１８の駆動による給湯加圧を行うので、この給湯時における給湯加圧不足を解消することができる。これにより、給湯不足になることなく、使用者は安定した出湯量の湯を使用することができる。また、このような給湯加圧には、追い焚き運転に使用する循環用ポンプ１８を使用するものであり、加圧用のポンプを別途設ける必要がない。このため、施工時における加圧用のポンプ等の取付作業がなく、施工時間の短縮を図ると共に、ポンプ用のスペースの確保も必要がなく、さらにはコストの低減を達成できる。 According to the hot water supply apparatus, hot water supply pressurization is performed by driving the circulation pump 18 when hot water is supplied to a kitchen or the like, so that lack of hot water supply pressurization during hot water supply can be resolved. Thereby, the user can use hot water with a stable amount of hot water without shortage of hot water supply. In addition, the hot water supply pressurization uses the circulation pump 18 used for the reheating operation, and it is not necessary to separately provide the pressurization pump. For this reason, there is no attachment work of the pressurization pump etc. at the time of construction, it is possible to shorten the construction time, it is not necessary to secure a space for the pump, and further reduction in cost can be achieved.
また、追い焚き運転時において、循環用ポンプ１８の駆動による給湯加圧を行わない台所等への給湯を可能としたので、追い焚き運転時における循環用ポンプ１８による循環路１４内での湯の循環を安定して行うことができる。このため、追い焚き運転の信頼性を損なわずに安定した運転（追い焚き運転）を行うことができる。さらに、切換手段Ｓに三方弁２３を使用するので、ふろ追い焚き運転と給湯加圧運転との切換操作を簡単にかつ確実に行うことができ。このため、切換操作が安定して、使用状況に応じて最適な状態で運転することができる。 In addition, since the hot water supply to the kitchen or the like that does not perform hot water pressurization by driving the circulation pump 18 is possible during the reheating operation, the hot water in the circulation path 14 by the circulation pump 18 during the reheating operation can be obtained. Circulation can be performed stably. For this reason, it is possible to perform a stable operation (a chasing operation) without impairing the reliability of the chasing operation. Furthermore, since the three-way valve 23 is used for the switching means S, the switching operation between the bathing operation and the hot water supply pressurizing operation can be performed easily and reliably. For this reason, the switching operation is stable, and the vehicle can be operated in an optimum state according to the use situation.
以上にこの発明の具体的な実施の形態について説明したが、この発明は上記形態に限定されるものではなく、この発明の範囲内で種々変更して実施することができる。例えば、図３と図４における給湯状態は、分岐管１７ｂを使用した給湯混合弁を介しての台所等の蛇口から出湯する状態であったが、分岐管１７ａを使用したふろ給湯混合弁を介しての浴槽２に湯を供給する状態であってもよい。また、熱源ユニット４として、上記実施の形態では、ヒートポンプ式のものを使用したが、ヒータや火力等を使用した他の熱源ユニットを使用してもよい。また、切換手段Ｓとしては、三方弁を使用することなく、複数の開閉弁を備えた切換回路等にて構成してもよい。さらに、ヒートポンプ式を使用する場合においても、冷凍サイクル３の冷媒として、ジクロロジフルオロメタン（Ｒ−１２）やクロロジフルオロメタン（Ｒ−２２）や１，１，１，２−テトラフルオロエタン（Ｒ−１３４ａ）等のような冷媒であっても、炭酸ガス、エチレン、エタン、酸化窒素等の自然系冷媒であってもよい。 Although specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, the hot water supply state in FIGS. 3 and 4 is a state in which hot water is discharged from a faucet of a kitchen or the like through a hot water supply mixing valve using the branch pipe 17b, but through a bath hot water supply mixing valve using the branch pipe 17a. It may be in a state where hot water is supplied to all bathtubs 2. Moreover, although the heat pump type thing was used as the heat source unit 4 in the said embodiment, you may use the other heat source unit which uses a heater, a thermal power, etc. Further, the switching means S may be configured by a switching circuit having a plurality of on-off valves without using a three-way valve. Further, even when the heat pump type is used, as a refrigerant of the refrigeration cycle 3, dichlorodifluoromethane (R-12), chlorodifluoromethane (R-22), 1,1,1,2-tetrafluoroethane (R— 134a) or a natural refrigerant such as carbon dioxide, ethylene, ethane, or nitric oxide.
１・・貯湯タンク、２・・浴槽、１３・・出湯路、１４・・循環路、１８・・循環用ポンプ、１９・・熱交換路、２０・・外部熱交換器、２３・・三方弁、Ｓ・・切換手段 1 .... Hot water storage tank, 2 .... Bathtub, 13 .... Hot water supply path, 14 .... Circulation path, 18 .... Circulation pump, 19 .... Heat exchange path, 20 .... External heat exchanger, 23 ... Three-way valve , S ... switching means
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| JP2003404618A JP4389566B2 (en) | 2003-12-03 | 2003-12-03 | Water heater |
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| JP3778115B2 (en) * | 2002-03-27 | 2006-05-24 | 松下電器産業株式会社 | Heat pump water heater |
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