JP2004137748A

JP2004137748A - Snow melting equipment

Info

Publication number: JP2004137748A
Application number: JP2002303078A
Authority: JP
Inventors: Yasuo Uchikawa; 内川　靖夫; Masafumi Inoue; 井上　雅史
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2002-10-17
Filing date: 2002-10-17
Publication date: 2004-05-13

Abstract

【課題】散水による融雪の効率を安定的に高く保ちながら採取水保有熱量の有効利用を促進する。
【解決手段】取水源４から採取した水Ｗを第１融雪対象箇所１Ｇに対して散水する融雪用の散水手段１と、第２融雪対象箇所２Ｇに対して熱媒Ｍを放熱させる融雪用の放熱手段２と、取水源４から散水手段１に送る採取水Ｗ（Ｗａ）を採熱源として放熱手段２に対する供給熱媒Ｍを加熱するヒートポンプ３とを備える融雪設備において、取水源４における採取対象水Ｗの温度変化に応じヒートポンプ３の出力を調整して、散水手段１に対する供給採取水Ｗｃの温度ｔｚを設定適正温度ｔｚｚに調整する制御手段１２を設ける。
【選択図】　　　　図１An object of the present invention is to promote the effective use of the calorific value of collected water while keeping the efficiency of snowmelt by water spray stable.
A water spraying means for spraying water W collected from a water intake source to a first snow melting target location, and a snow melting means for dissipating a heat medium to the second snow melting target location. In a snow melting facility including a heat dissipating means 2 and a heat pump 3 for heating a supply heat medium M to the heat dissipating means 2 using the sampled water W (Wa) sent from the water intake source 4 to the water sprinkling means 1 as a heat source, the collection target of the water intake source 4 Control means 12 is provided for adjusting the output of the heat pump 3 in accordance with the temperature change of the water W to adjust the temperature tz of the supply and sampling water Wc to the water sprinkling means 1 to a set appropriate temperature tzz.
[Selection diagram] Fig. 1

Description

【０００１】
【発明の属する技術分野】
本発明は、取水源から採取した水を第１融雪対象箇所に対して散水する融雪用の散水手段と、第２融雪対象箇所に対して熱媒を放熱させる融雪用の放熱手段と、前記取水源から前記散水手段に送る採取水を採熱源として前記放熱手段に対する供給熱媒を加熱するヒートポンプとを備える融雪設備に関する。
【０００２】
【従来の技術】
従来、この種の融雪設備では、融雪用の散水手段に送る採取地下水を採熱源として融雪用放熱手段に対する供給熱媒をヒートポンプで加熱するのに、採熱源である地下水をほぼ一定の温度幅だけ降温させるようにヒートポンプで採熱し、その採熱後の地下水を散水手段に送って第１融雪対象箇所に散水するようにしていた。
【０００３】
即ち、散水手段からは取水源における採取対象地下水の温度よりも一定温度幅だけ降温させた地下水を散水するようにして、その降温分のヒートポンプでの採取熱量をもって放熱手段で無散水式の融雪を実施し、これにより、地下水の保有熱量を有効利用するように、また、その分、地下水の採取必要量を削減できるようにしていた（例えば、特許文献１参照。）。
【０００４】
【特許文献１】
特許第２９７３２７６号公報
【０００５】
【発明が解決しようとする課題】
しかし、地下水とはいえ取水源において温度の変動があり、このため、ヒートポンプでほぼ一定の温度幅だけ降温させた地下水を散水する上記の従来設備では、取水源における採取対象地下水の温度が低下したとき、散水する地下水の温度が過度に低くなって散水による融雪の効率が低下してしまう問題があり、場合によっては散水した地下水が融雪対象箇所で氷結する恐れもあった。
【０００６】
また、取水源における採取対象地下水の温度が上昇したときには、散水する地下水の温度が必要以上に高くなって地下水の保有熱を散水で無駄に捨ててしまう熱ロスを生じ、そのことで所期の目的である地下水保有熱量の有効利用が不充分になる問題があり、場合によっては散水した融雪対象箇所で多量の湯気が発生して交通障害等を招来する恐れもあった。
【０００７】
この実情に鑑み、本発明の主たる課題は、上記問題を合理的な改良を以って効果的に解消する点にある。
【０００８】
【課題を解決するための手段】
〔１〕請求項１に係る発明は融雪設備に係り、その特徴は、
取水源から採取した水を第１融雪対象箇所に対して散水する融雪用の散水手段と、第２融雪対象箇所に対して熱媒を放熱させる融雪用の放熱手段と、前記取水源から前記散水手段に送る採取水を採熱源として前記放熱手段に対する供給熱媒を加熱するヒートポンプとを備える融雪設備において、
前記取水源における採取対象水の温度変化に応じ前記ヒートポンプの出力を調整して、前記散水手段に対する供給採取水の温度を設定適正温度に調整する制御手段を設けてある点にある。
【０００９】
つまり、この構成によれば、取水源における採取対象水の温度が低下したときには、それに応じヒートポンプの出力を低下させてヒートポンプでの採熱量を減少させることで、散水手段に対し供給する採取水の過度の温度低下を回避することができ、一方、取水源における採取対象水の温度が上昇したときには、それに応じヒートポンプの出力を増大させてヒートポンプでの採熱量を増大させることで、その大きな採取熱量を放熱手段による無散水式融雪の方で充分に有効利用するようにしながら、散水手段に対し供給する採取水の必要以上の高温化を回避することができ、これにより、従来に比べ、散水による融雪の効率を安定的に高く保ち、また、散水した水の氷結も一層確実に防止するようにしながら、所期の目的である採取水保有熱量の有効利用を一層効果的に促進することができ、また、高温水の散水による融雪対象箇所での多量の湯気発生も一層確実に防止することができる。
【００１０】
なお、請求項１に係る発明の実施において、取水源から採取する水は、地下水、河川水、湖沼水、海水、下水など、融雪に使用可能な温度を有するものであれば、どのような水であってもよい。
【００１１】
また、取水源における採取対象水の温度変化に応じヒートポンプの出力を調整して散水手段に対する供給採取水の温度を設定適正温度に調整するための具体的調整方式としては、取水源における採取対象水の温度を検出してその検出温度に基づきヒートポンプの出力調整を行なう方式や、ヒートポンプで採熱した後の散水手段に対する供給採取水の温度を検出してその検出温度に基づきヒートポンプの出力調整を行なう方式など、種々の調整方式を採用できる。
【００１２】
設定適正温度を具体的にどの程度の温度にするかは設備の設置条件や融雪条件等に応じて適宜決定すればよく、散水による融雪を効率を良く行うことができ、かつ、必要以上に高温の水の散水による熱ロスを効果的に防止できる適当な温度を採用すればよい。
【００１３】
〔２〕請求項２に係る発明は、請求項１に係る発明の実施に好適な実施形態を特定するものであり、その特徴は、
前記取水源から採取した水を、採熱源として前記ヒートポンプに通過させる水と前記ヒートポンプを迂回させる水とに分流させて前記散水手段に送る構成にしてある点にある。
【００１４】
つまり、この構成では、ヒートポンプを通過させた採熱後の降温水とヒートポンプを迂回させた水との混合水の温度が設定適正温度になるようにヒートポンプの出力を調整する形態を採るが、取水源から採取した水を上記のように分流させて散水手段に送ることにより、取水源から採取した水の全量をヒートポンプを通じて散水手段に送る形態を採るのに比べ、散水手段からの散水量を確保しながらも散水手段に対する全体としての送水抵抗を小さくすることができて、散水手段への送水における圧力損失を効果的に低減することができ、これにより、散水手段への送水に要するポンプを所要動力の小さなもので済ませることができて、設備コスト、運転コスト、省エネ面で有利にすることができる。
【００１５】
なお、取水源から採取した水の分流に関しては、その分流比を固定にする構成、あるいは、その分流比を調整自在にする構成のいずれを採用してもよいが、取水源における採取対象水の温度が低下してヒートポンプに送る水の温度が低下傾向になるほどヒートポンプに送る水の流量を増大させる側に分流比を自動調整するようにし、これにより、採熱部での水温低下や冷媒温低下によるヒートポンプの自動停止を抑止して設備の運転安定性を高めるようにしてもよい。
【００１６】
また、ヒートポンプを通過させた採熱後の降温水の温度が所定の温度よりも低下するときは、ヒートポンプの出力調整により採熱後の水の温度を所定温度に維持するようにして、採熱部での水温低下や冷媒温低下によるヒートポンプの自動停止を抑止して設備の運転安定性を高めるようにしてもよい。
【００１７】
〔３〕請求項３に係る発明は、請求項２に係る発明の実施に好適な実施形態を特定するものであり、その特徴は、
前記取水源から採取した水を前記散水手段に導く管路に、その採取水を採熱源として前記ヒートポンプに通過させる水と前記ヒートポンプを迂回させる水とに分流する分流部を設けてある点にある。
【００１８】
つまり、この構成によれば、ヒートポンプを通過させる水とヒートポンプを迂回させる水とに分流させる形式を採りながらも、その分流は取水源から採取した水を散水手段に導く管路上での分流であることから、その分流部よりも上流側に装備する１つのポンプで採取水を散水手段に送ることができ、これにより、設備コストを低廉化することができる。
【００１９】
また、既設の散水式融雪設備に対し放熱手段とヒートポンプとを増設して設備を構築する場合では、前述のように散水手段に対する全体としての送水抵抗を分流により小さくし得ることも相俟って、既設の散水式融雪設備で使用していたポンプをそのまま使用する、または、ポンプの変更が必要であるとしても既設ポンプより少しだけ揚程の高いポンプに変更するだけで済ませることができ、これにより、設備コストを一層低廉化することができる。
【００２０】
〔４〕請求項４に係る発明は、請求項２に係る発明の実施に好適な実施形態を特定するものであり、その特徴は、
前記取水源から採取した水を受け入れる上流槽と、その上流槽から溢水堰を通じて流出する水を受け入れる下流槽とを設け、
前記上流槽から取り出した貯留水を採熱源として前記ヒートポンプに送った後、前記下流槽に戻すとともに、それに並行して、前記散水手段に送る水を前記下流槽から取り出す構成にしてある点にある。
【００２１】
つまり、この構成では、採熱源としてヒートポンプに送る水を上流槽から取り出すことと、それに伴って、散水手段に送る水を取り出す下流槽に対し上流槽から溢水堰を通じて水を流出させることとをもって、取水源からの採取水をヒートポンプに通過させる水とヒートポンプを迂回させる水とに分流する。
そして、ヒートポンプを通過させた採熱後の降温水を下流槽に戻すことで、その戻り降温水と溢水堰から下流槽へ流入した水との混合水を散水手段に送るようにし、この混合水の温度が設定適正温度になるようにヒートポンプの出力を調整する形態を採る。
【００２２】
この構成によれば、上流槽や下流槽を沈砂槽に兼用して取水源からの採取水に対し除砂処理を施すことができ、この兼用化により設備コストを低廉化することができて、除砂処理が必要な採取水（例えば地下水や湧水）を用いる場合に好適な設備にすることができる。
また、既設の散水式融雪設備に対し放熱手段とヒートポンプとを増設して設備を構築する場合には、既設の散水式融雪設備が備える沈砂槽を利用して上流槽や下流槽を形成することもでき、これによって設備コストを一層低廉化することもできる。
【００２３】
〔５〕請求項５に係る発明は、請求項１〜４のいずれか１項に係る発明の実施に好適な実施形態を特定するものであり、その特徴は、
前記制御手段を、前記取水源における採取対象水の温度変化に応じて、前記散水手段に対する供給水量を調整する構成にしてある点にある。
【００２４】
つまり、この構成によれば、取水源における採取対象水の温度がかなり高くなってヒートポンプを上限出力で運転しても散水手段に対する供給採取水の温度が必要以上に高温になる場合に、制御手段による上記の供給水量調整により散水手段に対する供給水量（換言すれば、取水源からの採取水量）を減少させて、必要以上の無駄な高温水散水を回避することができ、この点、採取水保有熱量の有効利用の面、及び、採取必要水量の削減の面で一層優れた融雪設備にすることができる。
【００２５】
また、取水源における採取対象水の温度がかなり低くなってヒートポンプを下限出力で運転しても散水手段に対する供給採取水の温度が過度に低温になる場合に、制御手段による上記の供給水量調整により散水手段に対する供給水量やヒートポンプに対する通過水量を増加させて、散水による融雪の能力低下やヒートポンプの停止を回避することができ、この点、融雪機能の安定性の面でも一層優れた融雪設備にすることができる。
【００２６】
なお、請求項５に係る発明の実施において、取水源から採取した水をヒートポンプに通過させる水とヒートポンプを迂回させる水とに分流させて散水手段に送る形態を採る場合には、前述の如くその分流比の調整も自在な構成にするのが望ましい。
【００２７】
【発明の実施の形態】
〔第１実施形態〕
図１は請求項３に係る発明を適用した融雪設備を示し、１は第１融雪対象箇所１Ｇに対して多数の散水ノズル１ａから水Ｗｃを散水することで第１融雪対象箇所１Ｇの融雪を行なう散水手段としての散水装置、２は第２融雪対象箇所２Ｇに対して熱媒放熱による融雪を行なう放熱手段としての融雪用熱交換器、３は融雪用熱交換器２に循環させる熱媒Ｍを加熱するヒートポンプであり、ヒートポンプ３には、圧縮機３ａ、凝縮器３ｂ、膨張弁３ｃ、蒸発器３ｄを主要構成品として冷媒回路３ｒを形成した蒸気圧縮式のヒートポンプを用いている。
【００２８】
４は散水装置１に供給する水Ｗｃの取水源である井戸、５は井戸４における採取対象水Ｗ（すなわち、採取対象の地下水）を取水ポンプＰ１により貯水槽６に送出する取水路であり、貯水槽６は井戸４から採取した水Ｗを貯留することでその採取水Ｗに対し沈砂処理を施す沈砂槽を兼ねている。
【００２９】
７は貯水槽６に貯留してある水Ｗを給水ポンプＰ２により散水装置１に対して送出するための送出管路で、この送出管路７の途中部分には、給水ポンプＰ２からの送出水Ｗをヒートポンプ側分流管路７ａを通じヒートポンプ３に通過させて散水装置１に送る水Ｗａと、短絡側分流管路７ｂを通じヒートポンプ３を迂回させて直接に散水装置１に送る水Ｗｂとに分流する分流部８を設けてある。
【００３０】
そして、ヒートポンプ側分流管路７ａを通じヒートポンプ３に通過させる水Ｗａは、採熱源としてヒートポンプ３の蒸発器３ｄで冷媒Ｒと熱交換させた後、短絡側分流管路７ｂの通過水Ｗｂと合流部９で合流させて散水装置１に送るようにしてある。
【００３１】
すなわち、蒸発器３ｄで採熱されて温度降下したヒートポンプ通過側の低温ｔｙの水Ｗａを、温度降下なく短絡側分流管路７ｂを通過した高温ｔｘの水Ｗｂと混合し、この混合により均温化した混合水Ｗｃを散水装置１に供給するようにしてある。
【００３２】
合流部９には三方弁１０を設けてあり、この三方弁１０により、ヒートポンプ３に通過させて散水装置１に送る水Ｗａとヒートポンプ３を迂回させて散水装置１に送る水Ｗｂとの分流比を初期設定的に設定する。
【００３３】
１１は融雪用熱交換器２とヒートポンプ３とに亘らせた熱媒循環路であり、循環ポンプＰ３の運転により熱媒循環路１１を通じてヒートポンプ３の凝縮器３ｂと融雪用熱交換器２との間で熱媒Ｍを循環させる。
【００３４】
すなわち、ヒートポンプ３において冷媒Ｒを圧縮機３ａ−凝縮器３ｂ−膨張弁３ｃ−蒸発器３ｄの順に循環させることで、ヒートポンプ側分流管路７ａの通過水Ｗａに対し蒸発器３ｄを採熱機能させながら、熱媒循環路１１の循環熱媒Ｍに対し凝縮器３ｂを加熱機能させて、融雪用熱交換器２に送る熱媒Ｍを加熱し、この加熱した熱媒Ｍを融雪用熱交換器２において放熱させることで第２融雪対象箇所２Ｇの融雪を行う。
【００３５】
Ｓは合流部９の下流側において散水装置１に対する供給水Ｗｃの温度ｔｚ（すなわち、前記混合水の温度）を検出する温度センサ、１２は設備の運転制御を司る制御器であり、この制御器１２は、温度センサＳによる検出温度ｔｚに応じヒートポンプ３の出力を調整して散水装置１に対する供給水Ｗｃの温度ｔｚを設定適正温度ｔｚｚに調整する。
【００３６】
つまり、この制御器１２は取水源４における採取対象水Ｗの温度変化に応じヒートポンプ３の出力を調整して散水装置１に対する供給採取水Ｗｃの温度ｔｚを設定適正温度ｔｚｚに調整する制御手段を構成し、井戸４における採取対象水Ｗの温度が低下したときには、制御器１２による上記出力調整によりヒートポンプ３の出力が低下側に調整されてヒートポンプ３での採熱量が減少側に調整されることで、散水装置１に対する供給水Ｗｃの過度の温度低下が回避され、また、井戸４における採取対象水Ｗの温度が上昇したときには、制御器１２による上記出力調整によりヒートポンプ３の出力が増大側に調整されてヒートポンプ３での採熱量が増大側に調整されることで、その大きな採取熱量を融雪用熱交換器２の方で充分に有効利用するようにしながら、散水装置１に対する供給水Ｗｃの必要以上の高温化が回避される。
【００３７】
なお、上記の例では、ヒートポンプ側分流管路７ａを通じヒートポンプ３に通過させて散水装置１に送る水Ｗａと、短絡側分流管路７ｂを通じヒートポンプ３を迂回させて直接に散水装置１に送る水Ｗｂとの分流比を三方弁１０により初期設定的に設定（すなわち、固定的に設定）するようにしたが、井戸４における採取対象水Ｗの温度が低下してヒートポンプ３に送る水Ｗａの温度ｔｘが低下傾向になるほどヒートポンプ３に送る水Ｗａの流量を増大させる側に上記三方弁１０により分流比を自動調整するようにし、これにより、蒸発器３ｄにおいて水温や冷媒温が下限温度よりも低下することによるヒートポンプ３の自動停止を抑止して、設備の運転安定性を高めるようにしてもよい。
【００３８】
また、この分流比の自動調整を行う場合、具体的な調整形態としては、採熱源としてヒートポンプ３に送る水Ｗａの温度ｔｘを検出して、その検出温度ｔｘに基づき三方弁１０を調整する形態や、ヒートポンプ３から送出される採熱後の水Ｗａの温度ｔｙを検出して、その検出温度ｔｙに基づき三方弁１０を調整する形態を採用すればよい。
【００３９】
〔第２実施形態〕
図２は請求項４に係る発明を適用した融雪設備を示し、２１は第１融雪対象箇所１Ｇに対して多数の散水ノズル２１ａから水Ｗを散水することで第１融雪対象箇所１Ｇの融雪を行なう散水手段としての散水装置、２２は第２融雪対象箇所２Ｇに対して熱媒放熱による融雪を行なう放熱手段としての融雪用熱交換器、２３は融雪用熱交換器２２に循環させる熱媒Ｍを加熱するヒートポンプであり、このヒートポンプ２３には、圧縮機２３ａ、凝縮器２３ｂ、膨張弁２３ｃ、蒸発器２３ｄを主要構成品として冷媒回路２３ｒを形成した蒸気圧縮式のヒートポンプを用いている。
【００４０】
２４は散水装置２１に供給する水Ｗｃの取水源である井戸、２５は井戸２４における採取対象水Ｗを取水ポンプＰ１により貯水槽２６に送る取水路であり、貯水槽２６は、第１溢水堰２７ａとその第１溢水堰２７ａよりも低い第２溢水堰２７ｂとにより、井戸２４からの採取水Ｗを受け入れる第１貯水槽２６Ａと、第１貯水槽２６Ａから第１溢水堰２７ａを通じて流出する水Ｗを受け入れる第２貯水槽２６Ｂと、第２貯水槽２６Ｂから第２溢水堰２７ｂを通じて流出する水Ｗｂを受け入れる第３貯水槽２６Ｃとに区画してある。
【００４１】
そして、第１貯水槽２６Ａは、井戸２４から採取した水Ｗを受け入れてその採取水Ｗに含まれる砂を沈砂させる沈砂槽として機能させ、第２貯水槽２６Ｂは、ポンプＰ２′により分流路２８を通じてヒートポンプ２３の蒸発器２３ｄに送る水Ｗａを取り出す分流用の上流槽として機能させ、また、第３貯水槽２６Ｃはヒートポンプ２３の蒸発器２３ｄから戻る水Ｗａを受け入れて、その戻り水Ｗａを第２貯水槽２６Ｂからの流入水Ｗｂと混合する合流用の下流槽として機能させるようにしてあり、散水装置２１に対しては、この第３貯水槽２６Ｃから取り出した混合水Ｗｃを給水ポンプＰ２″により送出路２９を通じて供給するようにしてある。
【００４２】
つまり、ヒートポンプ２３の蒸発器２３ｄに送る水Ｗａを第２貯水槽２６Ｂから取り出すことと、それに伴って、第３貯水槽２６Ｃに対し第２貯水槽２６Ｂから第２溢水堰２７ｂを通じて水Ｗｂを流出させることとをもって、井戸４からの採取水Ｗを採熱源としてヒートポンプ２３の蒸発器２３ｄに通過させる水Ｗａとヒートポンプ２３を迂回させる水Ｗｂとに分流し、そして、ヒートポンプ２３の蒸発器２３ｄで採熱されて温度降下した低温ｔｙの水Ｗａを第３貯水槽２６Ｃに戻すことで、その戻り降温水Ｗａを温度降下なく第２溢水堰２７ｂを通じて第２貯水槽２６Ｂから第３貯水槽２６Ｃへ流入する高温ｔｘの水Ｗｂと混合し、この混合により均温化した混合水Ｗｃを散水装置２１に供給するようにしてある。
【００４３】
３１は融雪用熱交換器２２とヒートポンプ２３とに亘らせた熱媒循環路であり、循環ポンプＰ３の運転により熱媒循環路３１を通じてヒートポンプ２３の凝縮器２３ｂと融雪用熱交換器２２との間で熱媒Ｍを循環させる。
【００４４】
すなわち、第１実施形態と同様、ヒートポンプ２３において冷媒Ｒを圧縮機２３ａ−凝縮器２３ｂ−膨張弁２３ｃ−蒸発器２３ｄの順に循環させることで、分流路２８の通過水Ｗａに対し蒸発器２３ｄを採熱機能させながら、熱媒循環路３１の循環熱媒Ｍに対し凝縮器２３ｂを加熱機能させて、融雪用熱交換器２２に送る熱媒Ｍを加熱し、この加熱した熱媒Ｍを融雪用熱交換器２２において放熱させることで第２融雪対象箇所２Ｇの融雪を行う。
【００４５】
Ｓは散水装置２１に対して供給する混合水Ｗｃの温度ｔｚを検出する温度センサ、３２は設備の運転制御を司る制御器であり、この制御器３２は、温度センサＳによる検出温度ｔｚに応じヒートポンプ２３の出力を調整して散水装置２１に対する供給水Ｗｃの温度ｔｚを設定適正温度ｔｚｚに調整し、取水源２４における採取対象水Ｗの温度変化に応じヒートポンプ２３の出力を調整して散水装置２１に対する供給採取水Ｗｃの温度ｔｚを設定適正温度ｔｚｚに調整する制御手段を構成する。
【００４６】
〔別の実施形態〕
次に別実施形態を列記する。
【００４７】
上記の第１及び第２実施形態では、取水源４，２４からの採取水Ｗを採熱源としてヒートポンプ３，２３を通過させて散水手段１，２１に送る水Ｗａとヒートポンプ３，２３を迂回させて直接に散水手段１，２１に送る水Ｗｂとに分流するようにしたが、これに代え、図３に示す如く、取水源４からの採取水Ｗの全量を採熱源としてヒートポンプ３の蒸発器３ｄに通過させた上で散水手段１に供給するようにし、この構成において、ヒートポンプ３を通過した採熱後の採取水Ｗｃの温度ｔｚを検出する温度センサＳ、及び、この温度センサＳによる検出温度ｔｚに応じヒートポンプ３の出力を調整して、散水手段１に送る水Ｗｃの温度ｔｚを設定適正温度ｔｚｚに調整する制御手段１２を設けるようにしてもよい。
【００４８】
なお、図３において、第１実施形態と同機能のものには第１実施形態で用いた符号と同じ符号を付してある。
【００４９】
取水源４，２４における採取対象水Ｗの温度変化に応じヒートポンプ３，２３の出力を調整して散水手段１，２１に送る水Ｗｃの温度ｔｚを設定適正温度ｔｚｚに調整するのに、前述の如くヒートポンプ３，２３で採熱した後の散水手段１，２１に対する供給採取水Ｗｃ　（第１，第２実施形態ではヒートポンプ３，２３を通過させた水Ｗａとヒートポンプ３，２３を迂回させた水Ｗｂとの混合水、図３に示す実施形態ではヒートポンプ３を通過させた水）の温度ｔｚを検出して、その検出温度ｔｚに基づきヒートポンプ３，２３の出力を調整する制御形態に代え、取水源４，２４における採取対象水Ｗの温度や貯水槽６，２６Ａにおける採取水Ｗの温度を検出して、その検出温度に基づきヒートポンプ３，２３の出力を調整する制御形態を採用するなど、その調整のための具体的な制御形態は種々の変更が可能である。
【００５０】
請求項５に係る発明の実施形態として、取水源４，２４における採取対象水Ｗの温度変化に応じヒートポンプ３，２３の出力を調整して散水手段１，２１に対する供給採取水Ｗｃの温度ｔｚを設定適正温度ｔｚｚに調整する制御手段１２，３２を、そのヒートポンプ出力の調整に加え、取水源４，２４における採取対象水Ｗの温度変化に応じ散水手段１，２１に対する取水源４，２４からの供給水量を調整する構成にしてもよい。
【００５１】
また、その場合、取水源４，２４における採取対象水Ｗの温度低下でヒートポンプ３，２３の出力が下限出力近傍まで低下側に調整されたときに散水手段１，２１に対する取水源４，２４からの供給水量を増加させたり、取水源４，２４における採取対象水Ｗの温度上昇でヒートポンプ３，２３の出力が上限出力近傍まで上昇側に調整されたときに散水手段１，２１に対する取水源４，２４からの供給水量を減少させたりする調整形態に限らず、場合によっては、取水源４，２４における採取対象水Ｗの温度変化に応じ、ヒートポンプ３，２３の出力調整と並行して散水手段１，２１に対する取水源４，２４からの供給水量を調整する調整形態を採るようにしてもよい。
【００５２】
取水源４，２４から融雪用の散水手段１，２１に送る水Ｗを採熱源として融雪用の放熱手段２，２２に対する供給熱媒Ｍを加熱するヒートポンプ３，２３には、蒸気圧縮式のヒートポンプに限らず、吸収式ヒートポンプなど、その他、種々の形式のヒートポンプを採用することができる。
【００５３】
本発明の実施において、第１及び第２融雪対象箇所１Ｇ，２Ｇは夫々、道路、屋外駐車場、屋外階段を初め、融雪が必要な箇所であれば、どのような箇所であってもよく、また、第１融雪対象箇所１Ｇと第２融雪対象箇所２Ｇとは互いに接する箇所、一方が他方を囲む配置関係の箇所、互いに離間した箇所など、どのような配置関係の箇所であってもよい。
【００５４】
本発明で言う融雪とは、降雪した雪を融かす狭義の融雪に限らず、道路などの凍結防止を含む広義のものである。
【図面の簡単な説明】
【図１】第１実施形態を示す設備構成図
【図２】第２実施形態を示す設備構成図
【図３】別の実施形態を示す設備構成図
【符号の説明】
１Ｇ　　　　　　第１融雪対象箇所
２Ｇ　　　　　　第２融雪対象箇所
１，２１　　　　散水手段
２，２２　　　　放熱手段
３，２３　　　　ヒートポンプ
４，２４　　　　取水源
７　　　　　　　管路
８　　　　　　　分流部
１２，３２　　　制御手段
２６Ｂ　　　　　上流槽
２６Ｃ　　　　　下流槽
２７ｂ　　　　　溢水堰
Ｍ　　　　　　　熱媒
Ｗ　　　　　　　採取水
Ｗａ　　　　　　ヒートポンプに通過させる水
Ｗｂ　　　　　　ヒートポンプを迂回させる水[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a water-spraying means for spraying water collected from a water intake source to a first snow-melting target, a heat-dissipating means for snow-melting a heat medium to a second snow-melting target, The present invention relates to a snow melting facility comprising: a heat pump that heats a heat medium supplied to the heat radiating means by using a collected water sent from a water source to the water sprinkling means as a heat collecting source.
[0002]
[Prior art]
Conventionally, in this type of snow melting equipment, the groundwater that is supplied to the snowmelting radiating means is heated by a heat pump using the collected groundwater sent to the watermelting means for snowmelting as a heat source. The heat was collected by a heat pump so as to lower the temperature, and the groundwater after the heat collection was sent to a water spraying unit to spray water to the first snow melting target.
[0003]
In other words, from the water sprinkling means, the groundwater whose temperature has been lowered by a certain temperature range from the temperature of the groundwater to be collected at the water intake source is sprinkled, and the amount of heat collected by the heat pump for the lowered temperature is used to disperse the waterless snowmelt by the heat radiating means. By doing so, the calorific value of the groundwater can be effectively used, and the required amount of groundwater can be reduced accordingly (for example, see Patent Document 1).
[0004]
[Patent Document 1]
Patent No. 2973276 [0005]
[Problems to be solved by the invention]
However, despite the groundwater, there is a fluctuation in the temperature at the water intake source.For this reason, the temperature of the groundwater to be collected at the water intake source was reduced in the above-mentioned conventional facility for spraying the groundwater whose temperature was lowered by an almost constant temperature range with a heat pump. Sometimes, there is a problem that the temperature of the sprinkled groundwater becomes excessively low and the efficiency of snowmelt by sprinkling is reduced, and in some cases, the sprinkled groundwater may freeze at a snowmelting target location.
[0006]
Also, when the temperature of the groundwater to be collected at the water intake source rises, the temperature of the groundwater to be sprinkled rises more than necessary, causing heat loss that wastes the retained heat of the groundwater by sprinkling. There is a problem that the purpose of effectively utilizing the calorific value of groundwater is insufficient, and in some cases, a large amount of steam is generated at a location where snow is melted, which may cause a traffic obstacle.
[0007]
In view of this situation, a main problem of the present invention is to solve the above problem effectively with a rational improvement.
[0008]
[Means for Solving the Problems]
[1] The invention according to claim 1 relates to a snow melting facility.
Water spraying means for spraying water collected from a water intake source to a first snow melting target location; a heat dissipating means for snow melting for releasing a heat medium to a second snow melting target location; and water spraying from the water intake source. A heat pump that heats a heat medium supplied to the heat radiating means with the collected water sent to the means as a heat source,
A control means is provided for adjusting the output of the heat pump in accordance with a change in the temperature of the water to be collected in the water intake source, and adjusting the temperature of the water to be supplied to the watering means to a set appropriate temperature.
[0009]
In other words, according to this configuration, when the temperature of the water to be collected at the water intake source is reduced, the output of the heat pump is correspondingly reduced to reduce the amount of heat collected by the heat pump, thereby obtaining the collected water to be supplied to the water sprinkling means. Excessive temperature drop can be avoided, but when the temperature of the water to be collected at the water intake source rises, the output of the heat pump is correspondingly increased to increase the amount of heat collected by the heat pump, thereby increasing the amount of heat collected. It is possible to avoid unnecessarily increasing the temperature of the collected water supplied to the water sprinkling means more than necessary, while making effective use of the non-sprinkling snow melting by the heat radiating means. While maintaining the efficiency of snowmelt stably and preventing ice from sprinkling water more reliably, the intended purpose of holding Effectively utilized can be more effectively promoted, also can be a large amount of steam generated in the snow melting target portion by sprinkling hot water to more reliably prevent the.
[0010]
In the practice of the invention according to claim 1, water collected from a water intake source may be any water having a temperature usable for snow melting, such as groundwater, river water, lake water, seawater, sewage, and the like. It may be.
[0011]
In addition, as a specific adjustment method for adjusting the output of the heat pump in accordance with the temperature change of the water to be collected at the water intake source to adjust the temperature of the water to be supplied to the watering means to the set appropriate temperature, the water to be collected at the water intake source is Or the output of the heat pump is adjusted based on the detected temperature.The output of the heat pump is adjusted based on the detected temperature by detecting the temperature of the water collected and supplied to the watering means after the heat is collected by the heat pump. Various adjustment methods such as a method can be adopted.
[0012]
The specific temperature to be set as the appropriate temperature may be appropriately determined according to the installation conditions of the equipment, snow melting conditions, and the like, so that snow melting by water spray can be performed efficiently and the temperature is higher than necessary. Any suitable temperature that can effectively prevent heat loss due to water spraying may be employed.
[0013]
[2] The invention according to claim 2 specifies an embodiment suitable for carrying out the invention according to claim 1, and its features are as follows.
The point is that the water collected from the water intake source is divided into water that passes through the heat pump as a heat collection source and water that bypasses the heat pump, and is sent to the water sprinkling means.
[0014]
In other words, in this configuration, the output of the heat pump is adjusted so that the temperature of the mixed water of the temperature-reduced water that has passed through the heat pump and the water that has bypassed the heat pump reaches the set appropriate temperature. By dividing the water collected from the water source as described above and sending it to the sprinkling means, the amount of water sprinkled from the water sprinkling means is secured compared to the case where the whole amount of water collected from the water intake source is sent to the water sprinkling means through a heat pump. However, it is possible to reduce the water resistance as a whole with respect to the watering means, and to effectively reduce the pressure loss in watering to the watering means, thereby requiring a pump required for watering to the watering means. Since only a small amount of power is required, it is possible to make an advantage in equipment cost, operation cost, and energy saving.
[0015]
In addition, with respect to the shunt of water collected from the intake source, either a configuration in which the shunt ratio is fixed or a configuration in which the shunt ratio can be adjusted may be adopted. As the temperature decreases and the temperature of the water sent to the heat pump tends to decrease, the split ratio is automatically adjusted to increase the flow rate of the water sent to the heat pump, thereby reducing the water temperature and the refrigerant temperature in the heat collection unit. , The automatic stop of the heat pump may be suppressed to improve the operation stability of the equipment.
[0016]
Further, when the temperature of the temperature-reducing water after heat passing through the heat pump falls below a predetermined temperature, the temperature of the water after heat collection is maintained at the predetermined temperature by adjusting the output of the heat pump, and the heat is collected. The operation stability of the equipment may be enhanced by suppressing the automatic stop of the heat pump due to a decrease in the water temperature or the refrigerant temperature in the section.
[0017]
[3] The invention according to claim 3 specifies an embodiment suitable for carrying out the invention according to claim 2, and its features are as follows.
A conduit that guides water collected from the water intake source to the water sprinkling means is provided with a branch portion that divides the collected water into water that passes through the heat pump as a heat source and water that bypasses the heat pump. .
[0018]
In other words, according to this configuration, while taking a form of diverting the water that passes through the heat pump and the water that bypasses the heat pump, the diverting is a diverting on a pipe that guides the water collected from the water intake source to the water sprinkling means. Therefore, the collected water can be sent to the water sprinkling means by one pump provided on the upstream side of the branch portion, thereby reducing the equipment cost.
[0019]
In addition, in the case of constructing equipment by adding a heat radiating means and a heat pump to the existing water-sprinking snow melting equipment, as described above, the overall water supply resistance to the water sprinkling means can be reduced by shunting. , It is possible to use the pump that was used for the existing water-sprinking snow melting equipment as it is, or even if it is necessary to change the pump, simply change it to a pump with a slightly higher head than the existing pump, In addition, the equipment cost can be further reduced.
[0020]
[4] The invention according to claim 4 specifies an embodiment suitable for carrying out the invention according to claim 2, and its features are as follows.
An upstream tank for receiving water collected from the water intake source and a downstream tank for receiving water flowing out of the upstream tank through the overflow weir are provided.
After the stored water taken out from the upstream tank is sent to the heat pump as a heat source, the water is returned to the downstream tank and, in parallel with this, water sent to the water sprinkling means is taken out from the downstream tank. .
[0021]
In other words, in this configuration, by taking out the water to be sent to the heat pump from the upstream tank as a heat source, and by causing the water to flow out from the upstream tank through the overflow weir to the downstream tank to take out the water to be sent to the water sprinkling means, The water sampled from the water intake source is divided into water that passes through the heat pump and water that bypasses the heat pump.
Then, by returning the temperature-reduced water that has passed through the heat pump to the downstream tank, the mixed water of the returned temperature-reduced water and the water that has flowed into the downstream tank from the overflow weir is sent to the sprinkling means. In this case, the output of the heat pump is adjusted so that the temperature of the heat pump becomes the set appropriate temperature.
[0022]
According to this configuration, the sand removal treatment can be performed on the water collected from the water intake source by using the upstream tank and the downstream tank also as the sedimentation tank, and this dual use can reduce the equipment cost, Suitable facilities can be provided when using collected water (for example, groundwater or spring water) that requires sand removal treatment.
In addition, when constructing equipment by adding heat radiation means and heat pumps to the existing water-sprinking snow melting equipment, use the sand settling tank provided in the existing water-sprinking snow melting equipment to form upstream and downstream tanks. Therefore, the equipment cost can be further reduced.
[0023]
[5] The invention according to claim 5 specifies an embodiment suitable for carrying out the invention according to any one of claims 1 to 4, and its features are as follows.
The control means is configured to adjust the amount of water supplied to the water sprinkling means in accordance with a change in the temperature of the water to be collected at the water intake source.
[0024]
In other words, according to this configuration, when the temperature of the water to be collected at the water intake source becomes considerably high and the temperature of the water to be supplied to the watering means becomes unnecessarily high even when the heat pump is operated at the upper limit output, the control means In this way, the amount of water supplied to the water sprinkling means (in other words, the amount of water collected from the water intake source) can be reduced by the above-mentioned water supply amount adjustment, and unnecessary unnecessary high-temperature water watering can be avoided. It is possible to provide a more excellent snow melting facility in terms of effective use of heat and reduction in required amount of collected water.
[0025]
In addition, when the temperature of the water to be collected at the water intake source is considerably low and the temperature of the water to be collected to the water sprinkling means is excessively low even when the heat pump is operated at the lower limit output, the supply water amount is adjusted by the control means. By increasing the amount of water supplied to the watering means and the amount of water passing through the heat pump, it is possible to avoid a decrease in the ability to melt snow due to water spraying and to stop the heat pump. In this regard, the snow melting facility is more excellent in terms of stability of the snow melting function. be able to.
[0026]
In the practice of the invention according to claim 5, in a case where the water collected from the water intake source is divided into water for passing through the heat pump and water for bypassing the heat pump and sent to the water spraying means, as described above, It is desirable to have a configuration in which the division ratio can be adjusted freely.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
[First Embodiment]
FIG. 1 shows a snow melting facility to which the invention according to claim 3 is applied. Reference numeral 1 denotes a first snow melting target location 1G which is sprayed with water Wc from a number of water spray nozzles 1a to thereby melt snow at a first snow melting target location 1G. A water spraying device 2 as a water spraying means for performing heat melting, and a heat medium M circulating through the heat exchanger 2 for snow melting as a heat radiating means for radiating the snow by radiating the heat medium to the second snow melting target portion 2G. As the heat pump 3, a vapor compression heat pump in which a refrigerant circuit 3r is formed with a compressor 3a, a condenser 3b, an expansion valve 3c, and an evaporator 3d as main components is used.
[0028]
4 is a well which is a water intake source of water Wc to be supplied to the water sprinkling device 1, 5 is a water intake channel which sends out the water W to be collected in the well 4 (that is, the groundwater to be collected) to the water storage tank 6 by the water pump P1. The water storage tank 6 also serves as a sand settling tank for storing the water W collected from the well 4 and subjecting the collected water W to a sand setting process.
[0029]
Reference numeral 7 denotes a delivery line for sending out the water W stored in the water storage tank 6 to the watering device 1 by the water supply pump P2. W is diverted into water Wa which is passed through the heat pump 3 through the heat pump side branch pipe 7a and is sent to the sprinkler 1 and water Wb which is sent directly to the sprinkler 1 by bypassing the heat pump 3 through the short circuit side branch pipe 7b. A diverter 8 is provided.
[0030]
Then, the water Wa passed through the heat pump 3 through the heat pump side branch pipe 7a is subjected to heat exchange with the refrigerant R in the evaporator 3d of the heat pump 3 as a heat collecting source, and then merges with the passing water Wb of the short circuit side branch pipe 7b. At 9, they are merged and sent to the sprinkler 1.
[0031]
That is, the low-temperature ty water Wa on the heat pump passing side, which has been cooled down by the evaporator 3d, is mixed with the high-temperature tx water Wb that has passed through the short-circuit side branch pipe 7b without a temperature drop. The mixed water Wc is supplied to the sprinkler 1.
[0032]
The junction 9 is provided with a three-way valve 10. The three-way valve 10 allows the water Wa to be sent to the water sprinkler 1 by passing through the heat pump 3 and the water Wb to be sent to the water sprinkler 1 by bypassing the heat pump 3. Is set as the initial setting.
[0033]
Reference numeral 11 denotes a heat medium circulation path extending between the snow melting heat exchanger 2 and the heat pump 3. The condenser 3b of the heat pump 3 and the snow melting heat exchanger 2 are operated through the heat medium circulation path 11 by operating the circulation pump P3. The heat medium M is circulated between them.
[0034]
That is, by circulating the refrigerant R in the heat pump 3 in the order of the compressor 3a-the condenser 3b-the expansion valve 3c-the evaporator 3d, the evaporator 3d has a function of collecting heat from the passing water Wa of the heat pump side branch pipe 7a. In the meantime, the condenser 3b functions to heat the circulating heat medium M in the heat medium circulation path 11 to heat the heat medium M to be sent to the snow melting heat exchanger 2, and the heated heat medium M is transferred to the snow melting heat exchanger. 2, the second snow melting target location 2G is melted by releasing heat.
[0035]
S is a temperature sensor that detects the temperature tz of the supply water Wc to the sprinkler 1 (that is, the temperature of the mixed water) on the downstream side of the junction 9, and 12 is a controller that controls the operation of the equipment. 12 adjusts the output of the heat pump 3 in accordance with the temperature tz detected by the temperature sensor S to adjust the temperature tz of the supply water Wc to the sprinkler 1 to the set appropriate temperature tzz.
[0036]
That is, the controller 12 adjusts the output of the heat pump 3 in accordance with a change in the temperature of the water W to be collected in the water intake source 4 and adjusts the temperature tz of the supply and collected water Wc to the sprinkler 1 to the set appropriate temperature tzz. When the temperature of the water W to be collected in the well 4 is reduced, the output of the heat pump 3 is adjusted to a lower side by the output adjustment by the controller 12, and the amount of heat collected by the heat pump 3 is adjusted to a lower side. Therefore, when the temperature of the water W to be collected in the well 4 is increased, the output of the heat pump 3 is increased by the output adjustment by the controller 12 when the temperature of the water W to be collected in the well 4 is increased. By adjusting the amount of heat collected by the heat pump 3 to the increasing side, the large amount of collected heat is more effectively utilized by the heat exchanger 2 for snow melting. While Unishi, excessive high temperature of supply water Wc is avoided for the water spraying unit 1.
[0037]
In the above example, the water Wa to be sent to the water spray device 1 through the heat pump 3 through the heat pump side branch line 7a and the water to be directly sent to the water spray device 1 by bypassing the heat pump 3 through the short side branch line 7b. Although the split ratio with respect to Wb is set initially (that is, fixedly set) by the three-way valve 10, the temperature of the water Wa to be sent to the heat pump 3 when the temperature of the water W to be collected in the well 4 decreases and the temperature of the water Wa sent to the heat pump 3 is lowered. As the flow rate of the water Wa sent to the heat pump 3 increases as the value of tx decreases, the three-way valve 10 automatically adjusts the split ratio, whereby the water temperature or the refrigerant temperature in the evaporator 3d is lower than the lower limit temperature. In this case, the automatic stop of the heat pump 3 may be suppressed to improve the operation stability of the equipment.
[0038]
In addition, when performing the automatic adjustment of the split ratio, as a specific adjustment mode, a temperature tx of water Wa sent to the heat pump 3 as a heat source is detected, and the three-way valve 10 is adjusted based on the detected temperature tx. Alternatively, a mode may be adopted in which the temperature ty of the water Wa after heat taken out from the heat pump 3 is detected and the three-way valve 10 is adjusted based on the detected temperature ty.
[0039]
[Second embodiment]
FIG. 2 shows a snow melting facility to which the invention according to claim 4 is applied. Reference numeral 21 denotes a first snow melting target location 1G that sprays water W from a number of water spray nozzles 21a to the first snow melting target location 1G. A water spraying device as a water spraying means for performing the operation, 22 is a heat exchanger for snow melting as a heat radiating means for performing snow melting by radiating the heat medium to the second snow melting target location 2G, and 23 is a heat medium M circulated to the heat exchanger 22 for snow melting. The heat pump 23 uses a vapor compression heat pump in which a refrigerant circuit 23r is formed by using a compressor 23a, a condenser 23b, an expansion valve 23c, and an evaporator 23d as main components.
[0040]
Reference numeral 24 denotes a well which is a source of water Wc to be supplied to the sprinkler 21, reference numeral 25 denotes a water intake passage for sending the water W to be collected in the well 24 to the water storage tank 26 by the water pump P1, and the water storage tank 26 is a first flood weir. 27a and a second overflow weir 27b lower than the first overflow weir 27a, a first water storage tank 26A for receiving the collected water W from the well 24, and water flowing out of the first water storage tank 26A through the first overflow weir 27a. It is partitioned into a second water storage tank 26B for receiving W and a third water storage tank 26C for receiving water Wb flowing out from the second water storage tank 26B through the second overflow weir 27b.
[0041]
The first water storage tank 26A receives the water W collected from the well 24 and functions as a sedimentation tank for setting the sand contained in the collected water W, and the second water storage tank 26B is operated by the pump P2 'to divide the water in the distribution channel 28. Through which the water Wa to be sent to the evaporator 23d of the heat pump 23 is taken out, and the third water storage tank 26C receives the water Wa returned from the evaporator 23d of the heat pump 23 and transfers the returned water Wa to the third water storage tank 26C. The mixed water Wc taken out of the third water storage tank 26C is supplied to a water supply pump P2 ″ for the sprinkler 21 by mixing the inflow water Wb from the second water storage tank 26B with the downstream water tank. To supply through the delivery path 29.
[0042]
That is, the water Wa sent to the evaporator 23d of the heat pump 23 is taken out from the second water storage tank 26B, and accordingly, the water Wb flows out from the second water storage tank 26B to the third water storage tank 26C through the second overflow weir 27b. In this case, the water W collected from the well 4 is divided into water Wa that passes through the evaporator 23d of the heat pump 23 and water Wb that bypasses the heat pump 23 as heat sources, and is collected by the evaporator 23d of the heat pump 23. By returning the heated low-temperature ty water Wa whose temperature has dropped to the third water tank 26C, the returned temperature-falling water Wa flows from the second water tank 26B to the third water tank 26C through the second overflow weir 27b without a temperature drop. The water Wb is mixed with the water Wb having a high temperature tx, and the mixed water Wc, which has been temperature-balanced by the mixing, is supplied to the sprinkler 21.
[0043]
Reference numeral 31 denotes a heat medium circulating path extending between the snow melting heat exchanger 22 and the heat pump 23. The condenser 23b of the heat pump 23 and the snow melting heat exchanger 22 pass through the heat medium circulating path 31 by the operation of the circulation pump P3. The heat medium M is circulated between them.
[0044]
That is, as in the first embodiment, the refrigerant R is circulated in the heat pump 23 in the order of the compressor 23a, the condenser 23b, the expansion valve 23c, and the evaporator 23d, thereby causing the evaporator 23d to pass through the passing water Wa of the branch flow path 28. While making the heat collecting function, the condenser 23b is made to heat the circulating heat medium M in the heat medium circulating path 31 to heat the heat medium M to be sent to the heat exchanger 22 for melting snow, and the heated heat medium M is melted in snow. The second heat-melting target portion 2G is melted by radiating heat in the heat exchanger 22 for use.
[0045]
S is a temperature sensor for detecting the temperature tz of the mixed water Wc to be supplied to the sprinkling device 21, 32 is a controller for controlling the operation of the equipment, and the controller 32 responds to the temperature tz detected by the temperature sensor S. The output of the heat pump 23 is adjusted to adjust the temperature tz of the supply water Wc to the water sprinkling device 21 to the set appropriate temperature tzz, and the output of the heat pump 23 is adjusted according to the temperature change of the water W to be collected in the water intake source 24. A control means for adjusting the temperature tz of the supply and sampling water Wc with respect to 21 to the set appropriate temperature tzz is constituted.
[0046]
[Another embodiment]
Next, another embodiment will be described.
[0047]
In the above-described first and second embodiments, the water Wa sent from the water intake sources 4 and 24 as the heat collection source is passed through the heat pumps 3 and 23, and the water Wa sent to the water spraying means 1 and 21 and the heat pumps 3 and 23 are bypassed. In this case, as shown in FIG. 3, the evaporator of the heat pump 3 uses the entire amount of the water W collected from the water intake source 4 as a heat source. In this configuration, the temperature sensor S detects the temperature tz of the collected water Wc after the heat has passed through the heat pump 3 and the temperature sensor S detects the temperature tz of the collected water Wc that has passed through the heat pump 3. A control unit 12 that adjusts the output of the heat pump 3 in accordance with the temperature tz and adjusts the temperature tz of the water Wc sent to the water sprinkling unit 1 to the set appropriate temperature tzz may be provided.
[0048]
In FIG. 3, components having the same functions as those in the first embodiment are denoted by the same reference numerals as those used in the first embodiment.
[0049]
In order to adjust the temperature tz of the water Wc sent to the watering means 1 and 21 to the set appropriate temperature tzz by adjusting the output of the heat pumps 3 and 23 according to the temperature change of the water W to be collected in the water intake sources 4 and 24, as described above. As described above, the supply water Wc supplied to the water sprinkling means 1 and 21 after the heat is collected by the heat pumps 3 and 23 (in the first and second embodiments, the water Wa that has passed through the heat pumps 3 and 23 and the water that has bypassed the heat pumps 3 and 23). In the embodiment shown in FIG. 3, the temperature tz of the mixed water with Wb, in the embodiment shown in FIG. 3, the water passed through the heat pump 3) is detected, and the output of the heat pumps 3, 23 is adjusted based on the detected temperature tz. A control mode is adopted in which the temperature of the sampling water W in the water sources 4, 24 and the temperature of the sampling water W in the water storage tanks 6, 26A are detected, and the outputs of the heat pumps 3, 23 are adjusted based on the detected temperatures. Various changes can be made to the specific control form for the adjustment, such as the use.
[0050]
As an embodiment of the invention according to claim 5, the output of the heat pumps 3, 23 is adjusted according to the temperature change of the water W to be collected in the water intake sources 4, 24 to adjust the temperature tz of the supply water Wc supplied to the watering means 1, 21. The control means 12, 32 for adjusting the temperature to the set appropriate temperature tzz, in addition to the adjustment of the output of the heat pump, adjusts the temperature of the water W to be collected in the water supply sources 4, 24 to the watering means 1, 21 from the water supply sources 4, 24. A configuration in which the amount of supplied water is adjusted may be adopted.
[0051]
Also, in this case, when the output of the heat pumps 3, 23 is adjusted to a lower side near the lower limit output due to a decrease in the temperature of the water W to be collected at the water sources 4, 24, the water sources 4, 24 for the watering means 1, 21 are provided. When the output of the heat pumps 3 and 23 is adjusted to the rising side near the upper limit output by increasing the supply water amount of the water or the temperature of the water W to be sampled at the water intake sources 4 and 24, the water supply source 4 for the watering means 1 and 21 is increased. The water supply means is not limited to an adjustment mode for reducing the amount of water supplied from the water pumps 24, 24, and in some cases, in accordance with a temperature change of the water W to be collected in the water intake sources 4, 24, in parallel with the output adjustment of the heat pumps 3, 23. It is also possible to adopt an adjustment mode for adjusting the amount of water supplied from the water intake sources 4 and 24 with respect to 1 and 21.
[0052]
The heat pumps 3, 23 for heating the supply heat medium M to the heat dissipating means 2, 22 for snow melting using the water W sent from the water intake sources 4, 24 to the water dispersing means 1, 21 for snow melting as a heat collecting source, include a vapor compression heat pump. However, various types of heat pumps, such as an absorption heat pump, can be adopted.
[0053]
In the practice of the present invention, the first and second snow melting target locations 1G and 2G may be any locations where snow melting is required, including roads, outdoor parking lots, and outdoor stairs, respectively. Further, the first snow-melting target location 1G and the second snow-melting target location 2G may be in any location such as a location in contact with each other, a location in which one surrounds the other, or a location separated from each other.
[0054]
The term “melting snow” as used in the present invention is not limited to melting snow in the narrow sense of melting snow that has fallen, but is in a broad sense including preventing freezing of roads and the like.
[Brief description of the drawings]
FIG. 1 is an equipment configuration diagram showing a first embodiment. FIG. 2 is an equipment configuration diagram showing a second embodiment. FIG. 3 is an equipment configuration diagram showing another embodiment.
1G First snow melting target location 2G Second snow melting target location 1, 21 Water spraying means 2, 22 Heat dissipating means 3, 23 Heat pump 4, 24 Water intake source 7 Pipe line 8 Dividing section 12, 32 Control means 26B Upstream tank 26C Downstream tank 27b Overflow Weir M Heat medium W Sampling water Wa Water passing through the heat pump Wb Water bypassing the heat pump

Claims

Water spraying means for spraying water collected from a water intake source to a first snow melting target location; a heat dissipating means for snow melting for releasing a heat medium to a second snow melting target location; and water spraying from the water intake source. A heat pump that heats a heat medium supplied to the heat radiating means with the collected water sent to the means as a heat source,
A snow melting facility provided with control means for adjusting the output of the heat pump in accordance with a change in the temperature of the water to be collected in the water intake source to adjust the temperature of the water to be supplied to the watering means to a set appropriate temperature.

2. The snow melting facility according to claim 1, wherein the water collected from the water intake source is divided into water that passes through the heat pump as a heat collection source and water that bypasses the heat pump, and is sent to the water spraying unit. 3.

3. A pipe for guiding water collected from the water intake source to the water sprinkling means, wherein a diversion section is provided for dividing the collected water into water that passes through the heat pump as a heat source and water that bypasses the heat pump. The described snow melting facility.

An upstream tank for receiving water collected from the water intake source and a downstream tank for receiving water flowing out of the upstream tank through the overflow weir are provided.
3. A configuration in which stored water taken out from the upstream tank is sent to the heat pump as a heat source, and then returned to the downstream tank, and water sent to the water sprinkling means is taken out from the downstream tank in parallel. The described snow melting equipment.

The snow melting facility according to any one of claims 1 to 4, wherein the control means is configured to adjust an amount of water supplied to the water sprinkling means in accordance with a temperature change of the water to be collected at the water intake source.