JP2004144400A - Waste heat recovering device - Google Patents

Waste heat recovering device Download PDF

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Publication number
JP2004144400A
JP2004144400A JP2002310461A JP2002310461A JP2004144400A JP 2004144400 A JP2004144400 A JP 2004144400A JP 2002310461 A JP2002310461 A JP 2002310461A JP 2002310461 A JP2002310461 A JP 2002310461A JP 2004144400 A JP2004144400 A JP 2004144400A
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Prior art keywords
exhaust
heat
heat exchange
refrigerant
building
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Japanese (ja)
Inventor
Yoji Akaha
赤羽 洋二
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Denso Aircool Corp
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Denso Aircool Corp
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Priority to JP2002310461A priority Critical patent/JP2004144400A/en
Publication of JP2004144400A publication Critical patent/JP2004144400A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F12/00Use of energy recovery systems in air conditioning, ventilation or screening
    • F24F12/001Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
    • F24F12/002Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an intermediate heat-transfer fluid
    • 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]
    • Y02B30/56Heat recovery units

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Building Environments (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waste heat recovering device that can be installed in simple constitution without being restricted by layout of a discharge air port and a supply air port in a building. <P>SOLUTION: A discharge air side heat exchanger 9 and a supply air side heat exchanger 10 are piping-connected to each other at both ends of a heat exchanger 12 to form a closed circuit. Cooling medium is fed by a circulation pump 16 provided in liquid phase side connection piping 14, and phase change is repeated, while it is circulated in the closed circuit to be heat-exchanged, thereby waste heat is recovered. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する利用分野】
本発明は、例えばテナントビル、飲食店、一般住宅などの建物の換気用に用いられる排熱回収装置に係り、詳しくは建物内の内気を建物外へ排気する際に排熱回収し、回収された排熱により建物内へ給気される外気を暖気する排熱回収装置に関する。
【0002】
【従来の技術】
外食チェーン店などの厨房では、調理装置を長時間稼動させておくことから、健全な労働環境を維持するため換気が義務付けられており、換気する際の排気風量も法定されている。例えば、中華料理用の厨房では中華レンジ系統の法定排気風量は3600m/h、オーブン系統の法定排気風量は650m/h等となっている。
【0003】
厨房内の換気を行う場合、外気をそのまま厨房内へ給気することによる不快感を解消したり、寒冷地での暖房費の削減を図るため、排気用ダクト及び給気用ダクトにヒートパイプを用いた熱交換器が設けられている(例えば特許文献1参照)。具体的には、厨房内の排気より回収した熱により外気を暖めて給気するようにしている。ヒートパイプは、熱伝導率が良く、熱の長距離輸送が可能であり、輸送速度も速いため熱交換器に好適に用いられる。ヒートパイプ内には作動流体(例えばフロンガス、COガス等)が封入されており、パイプを傾斜させて設けることにより自重により自然流下し、高温排気を通過させる際に潜熱を奪って液体から気体へ相変化し、低温給気を通過させる際に潜熱を奪われて気体が液体へ相変化することにより熱交換が行われる。
【0004】
尚、冷媒が封入された重力式ヒートパイプを用いた建物の空調システムとしては、ビルの屋上に設けられた冷却器と同一若しくは各階層毎に設けた空調器との間で冷媒の相変化を利用して建物の空調を行う空調システムが提案されている(例えば特許文献2参照)。
【0005】
【特許文献1】
特公平7−39912号公報(図3)
【特許文献2】
特開平5−312361号公報
【0006】
【発明が解決しようとする課題】
新築の建物や住宅などにおいては、予め厨房の排気口の近くに給気口を設けて排気ダクト及び給気ダクトを並設しておくことができるため、特許文献1に示すヒートパイプを備えた熱交換器を、図4のように排気ダクト101及び給気ダクト102に各々交差して設けることができる。熱交換器103はヒートパイプ107内に封入された冷媒が自然流下式で相変化によりパイプ内を循環するようになっているため、ヒートパイプ107は液相側が気相側より低くなるように傾けて設置される。ヒートパイプ107の液相側104が排気ダクト101に交差し、気相側105が給気ダクト102に交差するように配置されて熱交換を行うようになっている。
【0007】
しかしながら、排気ダクト101と給気ダクト102とを近接して配置する必要があり、厨房106や客室等のレイアウトを行う上で設計上の制約となる。また、テナントや貸し店舗などの既存設備を用いる場合、排気口と給気口とが離れた場所に配置されている場合があり、排気ダクト101−給気ダクト102間に特許文献1に示す熱交換器103が設置できない場合があった。特に、冷媒が相変化により循環するヒートパイプ107は傾斜して配置する必要があるため、ダクトどうしが離れていると設置できなくなる場合があった。
【0008】
また、特許文献2の空調システムは、ヒートパイプに封入された冷媒の相変化を利用しているが、建物の屋上に配置された冷却器と各部屋に設けられた室内ユニットとの間で熱交換を行う大型の空調システムを想定したものであり、店舗用や一般住宅用としては不向きである。
【0009】
本発明の目的は、上記従来技術の課題を解決し、建物の排気口と給気口のレイアウトに制約されることなく簡易な構成で設置でき、換気に伴う不快感を解消し併せて暖房効率を向上させて消費エネルギーを削減できる排熱回収装置を提供することにある。
【0010】
【課題を解決するための手段】
上記課題を解決するため、本発明は次の構成を備える。
建物内の内気を建物外へ排気する際に排熱回収し、回収された排熱を利用して建物内へ給気される外気を暖気する排熱回収装置において、建物内の内気を排出する排気ダクトの排気路と熱交換器が交差して配設された熱交換部と、建物内に外気を取り込む給気ダクトの給気路と熱交換器が交差して配設された熱交換部とが設けられ、前記排気側熱交換部と給気側熱交換部とが熱交換器の両端を配管接続されて冷媒が封入された閉回路が形成され、液相側接続配管に設けられた循環用ポンプにより冷媒を送り出して相変化を繰り返して前記閉回路内を循環する際に熱交換が行われて排熱回収することを特徴とする。
また、前記循環用ポンプにより液相側接続配管内の冷媒が前記排気側熱交換部へ送り込まれ、該排気側熱交換部で高温の排気から吸熱して蒸気化し、該蒸気化した冷媒が気相側接続配管を通じて給気側熱交換部へ送り込まれ、該給気側熱交換部で低温の給気へ放熱して液化した冷媒が再度液相側接続配管へ自然流下して循環するサイクルを繰り返すことにより排熱回収することを特徴とする。
【0011】
【発明の実施の形態】
以下、本発明の好適な実施の形態について添付図面と共に詳述する。本実施例では、レストランの厨房に設置された排熱回収装置を例示して説明する。
図1は排熱回収装置の模式説明図、図2は排熱回収装置の配管経路を示す説明図、図3はレストランの厨房に設置された排熱回収装置の一例を示すレイアウト図である。
【0012】
先ず、図3を参照して外食チェーン店用の厨房のレイアウト図を参照して説明する。店舗内は厨房1と客室2とが間仕切り(ドア及び仕切り壁)3で仕切られている。厨房1内には排気口4と給気口5とが離れた位置に設けられている。排気口4には、厨房1内の熱気を排気する排気ダクト6が接続されている。排気ダクト6は、厨房1内の各種調理器(レンジグリル6a、オーブン6b、バーナー6c等)の上方に設けられた各フードと排気口4とを接続している。排気ダクト6内に設けられた図示しない排気ファンを回転させて、各種調理器で発生した熱気を含む内気を建物外へ排出するようになっている。また、給気口5には、給気ダクト7が接続されている。給気ダクト7には給気ファン8が2箇所に設けられており、該給気ファン8を回転させて、外気を厨房1内に取り込むようになっている。
【0013】
排気側熱交換部9は建物内の内気を排出する排気ダクト6の排気路に設けられており、給気側熱交換部10は建物内に外気を取り込む給気ダクト7の給気路に設けられている。排熱回収装置11は、排気側熱交換部9と給気側熱交換部10との間で冷媒を循環させて厨房内の熱気を建物外へ排気する際に排熱回収し、回収された排熱を利用して厨房1内へ給気される外気を暖気するものである。
【0014】
図1及び図2において、排気側熱交換部9は、排気ダクト6の排気路と単数又は複数の熱交換器12が交差して配設されている。また、給気側熱交換部10は、給気ダクト7の給気路と単数又は複数の熱交換器12が交差して配設されている。排気側熱交換部9と給気側熱交換部10とは、熱交換器12の一端(気相側端部)どうしが気相側接続配管13により接続され、他端(液相側端部)どうしが液相側接続配管14により接続されて単数又は複数の閉回路が形成されている。この閉回路内には冷媒(例えばフロンガスやCOガス等)が封入されている。熱交換器12としては、鋼管の周面にスパイン状フィンが形成されたものや、プレートフィンが多数嵌め込まれたものなどが用いられる。
【0015】
また、排気側熱交換部9は、厨房から排出される内気より排熱回収するため、熱交換器12の外周に汚れが付着し易い。このため、熱交換器に洗浄液を吐出して洗浄する洗浄機構(図示せず)を備えていても良い。また、給気側熱交換部10の給気方向上流側には、塵や虫などの進入を防止するためのフィルター15が設けられている。
【0016】
また、液相側接続配管14の一部には冷媒循環用ポンプ16が設けられている。冷媒循環用ポンプ16は、液相側接続配管14内の冷媒を排気側熱交換部9へ送り出して閉回路内を循環させる。循環用ポンプ16により液相側接続配管14内の冷媒が排気側熱交換部9へ送り込まれ、該排気側熱交換部9で高温の排気から吸熱して蒸気化する。蒸気化した冷媒は気相側接続配管13を通じて給気側熱交換部10へ送り込まれ、該給気側熱交換部10で低温の給気へ放熱して液化する。液化した冷媒は再度液相側接続配管14へ自然流下して回収される。このような循環サイクルを繰り返すことにより排熱回収する。これにより、厨房1で換気を行う際に、排気ダクト6より排出される排気は排気側熱交換部9を通過する際に冷やされて排気され、給気ダクト7より取り込まれる給気は給気側熱交換部10を通過する際に暖気されて取り込まれる。
尚、冷媒循環用ポンプ16は、給気側熱交換部10より低い位置に設けられているのが望ましい。給気側熱交換部10の熱交換器12において気相から液相へ相変化した冷媒を自然流下させて効率的に回収し、液相側接続配管14内を通じて再度排気側熱交換部9の熱交換器12へ送り込むためである。
【0017】
以上のように、排気側熱交換部9と給気側熱交換部10とが熱交換器12の両端を配管接続されて冷媒が封入された閉回路が形成されているので、建物の排気口4と給気口5のレイアウトに制約されることなく簡易な構成で排熱回収装置11が設置でき、換気に伴う不快感を解消することができる。また、空調機との組み合わせで暖房効率を向上させて消費エネルギーを削減できる。よって、新築の建物のみならずテナントビル、貸し店舗、中古住宅などの既存の建物にも排熱回収装置11を設置することができ、省エネルギー化を図ることができる。
また、液相側接続配管14の一部に冷媒循環用ポンプ16を設けることにより、閉回路内を循環する冷媒の必要循環量を確保することができる。
【0018】
図2において、排熱回収条件を例示すると、内気温度(排気温度)を35℃、排気温度を15℃、外気温度を−5℃、給気温度を15℃で熱交換が行われるように設計されている。排気側熱交換部9及び給気側熱交換部10には熱交換器12が4本ずつ設けられ、即ち冷媒が循環する4つの閉回路が設けられている。1回路当たりの温度効率を20%と仮定し、システム全体の温度効率が50%となるように設計されている。厨房内で消費される燃料消費量を142,400kal/hとすると50%に相当する71,200kal/hを回収できる。
【0019】
以上、本発明の好適な実施例について述べてきたが、本発明は上述した実施例に限定されるのものではなく、排気側熱交換部9や給気側熱交換部10に設けられる熱交換器12の数(閉回路の数)も4本に限らず、それより少なくても多くても良い。熱交換器12に封入される冷媒はフロンガスやCOガスに限らず、排熱により相変化する媒体であれば他の媒体であっても良い。また、排熱回収装置11は、飲食業務用の厨房に限らず、一般家庭用の厨房にも適用でき、厨房に限らず、浴室や居間などであっても良い等、法の精神を逸脱しない範囲で多くの改変を施し得るのはもちろんである。
【0020】
【発明の効果】
本発明は上述したように、排気側熱交換部と給気側熱交換部とが熱交換器の両端を配管接続されて冷媒が封入された閉回路が形成されているので、建物の排気口と給気口のレイアウトに制約されることなく簡易な構成で排熱回収装置が設置でき、換気に伴う不快感を解消することができる。また、空調機との組み合わせで暖房効率を向上させて消費エネルギーを削減できる。よって、新築の建物のみならず既存の建物にも排熱回収装置を設置することができ、省エネルギー化を図ることができる。
また、液相側接続配管の一部に循環用ポンプを設けることにより、閉回路内を循環する冷媒の必要循環量を確保することができる。
【図面の簡単な説明】
【図1】排熱回収装置の模式説明図である。
【図2】排熱回収装置の配管経路を示す説明図である。
【図3】レストランに設置された排熱回収装置の一例を示すレイアウト図である。
【図4】従来の排熱回収装置の説明図である。
【符号の説明】
1 厨房
2 客室
3 間仕切り
4 排気口
5 給気口
6 排気ダクト
7 給気ダクト
8 給気ファン
9 排気側熱交換部
10 給気側熱交換部
11 排熱回収装置
12 熱交換器
13 気相側接続配管
14 液相側接続配管
15 フィルター
16 冷媒循環用ポンプ
[0001]
FIELD OF THE INVENTION
The present invention relates to an exhaust heat recovery device used for ventilation of a building such as a tenant building, a restaurant, a general house, and more particularly, to exhaust heat recovery when exhausting the inside air of a building to the outside of the building, and recovering the exhaust heat. The present invention relates to an exhaust heat recovery device that warms outside air supplied into a building by exhaust heat.
[0002]
[Prior art]
In kitchens such as restaurant chains, the cooking equipment is operated for a long time, so ventilation is obligatory to maintain a healthy working environment. For example, in a kitchen for Chinese cuisine, the legal exhaust air volume of the Chinese range system is 3600 m 3 / h, and the legal exhaust air volume of the oven system is 650 m 3 / h.
[0003]
When ventilating the kitchen, use heat pipes in the exhaust duct and the air supply duct to eliminate discomfort caused by supplying the outside air to the kitchen as it is and to reduce heating costs in cold regions. The used heat exchanger is provided (for example, refer to Patent Document 1). Specifically, outside air is warmed and supplied by heat recovered from exhaust gas in the kitchen. The heat pipe is suitable for use in a heat exchanger because it has good heat conductivity, can transport heat over long distances, and has a high transport speed. A working fluid (for example, chlorofluorocarbon gas, CO 2 gas, etc.) is sealed in the heat pipe. When the pipe is inclined, it flows down naturally by its own weight. When the low-temperature supply air is passed, the latent heat is deprived, and the gas changes into a liquid to perform heat exchange.
[0004]
In addition, as an air conditioning system for a building using a gravitational heat pipe filled with a refrigerant, a phase change of the refrigerant is performed between an air conditioner provided at the same level as a cooler provided at the roof of the building or at each level. An air conditioning system for performing air conditioning of a building using the same has been proposed (for example, see Patent Document 2).
[0005]
[Patent Document 1]
Japanese Patent Publication No. 7-39912 (FIG. 3)
[Patent Document 2]
JP-A-5-321361
[Problems to be solved by the invention]
In a newly-built building or house, an air supply port is provided in advance near an exhaust port of a kitchen, and an exhaust duct and an air supply duct can be arranged in parallel. A heat exchanger can be provided to intersect the exhaust duct 101 and the air supply duct 102 as shown in FIG. In the heat exchanger 103, since the refrigerant sealed in the heat pipe 107 circulates in the pipe by a phase change in a natural flow manner, the heat pipe 107 is inclined such that the liquid phase side is lower than the gas phase side. Installed. The liquid side 104 of the heat pipe 107 intersects with the exhaust duct 101, and the gas phase 105 intersects with the air supply duct 102 so as to exchange heat.
[0007]
However, it is necessary to arrange the exhaust duct 101 and the air supply duct 102 close to each other, which is a design constraint when laying out the kitchen 106 and the guest room. In addition, when using existing facilities such as tenants and rental stores, the exhaust port and the air supply port may be arranged at places separated from each other, and the heat disclosed in Patent Document 1 is provided between the exhaust duct 101 and the air supply duct 102. There were cases where the exchanger 103 could not be installed. In particular, since the heat pipe 107 through which the refrigerant circulates due to the phase change needs to be arranged at an angle, it may not be possible to install the heat pipe 107 if the ducts are separated from each other.
[0008]
Further, the air conditioning system of Patent Document 2 utilizes a phase change of a refrigerant sealed in a heat pipe. However, heat is generated between a cooler arranged on the roof of a building and an indoor unit provided in each room. It is intended for a large air-conditioning system to be replaced, and is not suitable for shops or general houses.
[0009]
An object of the present invention is to solve the above-mentioned problems of the prior art, to be able to be installed with a simple configuration without being restricted by the layout of the exhaust port and the air supply port of a building, to eliminate discomfort due to ventilation, and to improve the heating efficiency. It is an object of the present invention to provide an exhaust heat recovery device capable of improving energy consumption and reducing energy consumption.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configuration.
An exhaust heat recovery device that recovers exhaust heat when exhausting the inside air inside the building to the outside of the building and uses the recovered exhaust heat to warm the outside air supplied into the building, discharges the inside air inside the building. A heat exchange section where the exhaust path of the exhaust duct and the heat exchanger cross each other, and a heat exchange section where the heat exchanger and the air supply path of the air supply duct that take in outside air into the building cross each other. The exhaust-side heat exchange unit and the supply-side heat exchange unit are connected to both ends of the heat exchanger by a pipe, so that a closed circuit in which a refrigerant is sealed is formed, and the liquid-side connection pipe is provided. When the refrigerant is sent out by the circulation pump to repeat the phase change and circulate in the closed circuit, heat is exchanged and exhaust heat is recovered.
Further, the refrigerant in the liquid-phase connection pipe is sent to the exhaust-side heat exchange section by the circulation pump, and the exhaust-side heat exchange section absorbs heat from the high-temperature exhaust gas to vaporize, and the vaporized refrigerant is vaporized. The refrigerant is sent to the air supply side heat exchange section through the phase side connection pipe, and the refrigerant radiated to the low temperature air supply and liquefied by the air supply side heat exchange section flows down again to the liquid side connection pipe and circulates. It is characterized by exhaust heat recovery by repeating.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, an exhaust heat recovery apparatus installed in a restaurant kitchen will be described as an example.
FIG. 1 is a schematic explanatory diagram of the exhaust heat recovery device, FIG. 2 is an explanatory diagram showing a piping path of the exhaust heat recovery device, and FIG. 3 is a layout diagram showing an example of the exhaust heat recovery device installed in a restaurant kitchen.
[0012]
First, a layout diagram of a kitchen for a restaurant chain store will be described with reference to FIG. In the store, a kitchen 1 and a guest room 2 are partitioned by partitions (doors and partition walls) 3. In the kitchen 1, an exhaust port 4 and an air supply port 5 are provided at separate positions. An exhaust duct 6 for exhausting hot air in the kitchen 1 is connected to the exhaust port 4. The exhaust duct 6 connects each hood provided above various cookers (range grill 6a, oven 6b, burner 6c, etc.) in the kitchen 1 to the exhaust port 4. By rotating an exhaust fan (not shown) provided in the exhaust duct 6, inside air including hot air generated by various cookers is discharged to the outside of the building. An air supply duct 7 is connected to the air supply port 5. The air supply duct 7 is provided with air supply fans 8 at two places, and the air supply fans 8 are rotated to take in outside air into the kitchen 1.
[0013]
The exhaust-side heat exchange section 9 is provided in the exhaust path of the exhaust duct 6 that discharges inside air in the building, and the supply-side heat exchange section 10 is provided in the supply path of the intake duct 7 that takes in outside air into the building. Have been. The exhaust heat recovery device 11 recovers and recovers the exhaust heat when circulating the refrigerant between the exhaust-side heat exchange unit 9 and the supply-side heat exchange unit 10 to exhaust the hot air in the kitchen to the outside of the building. This is to heat the outside air supplied into the kitchen 1 using the exhaust heat.
[0014]
In FIGS. 1 and 2, the exhaust-side heat exchange section 9 is provided such that an exhaust path of the exhaust duct 6 and one or more heat exchangers 12 intersect. The air supply side heat exchange section 10 is provided with an air supply path of the air supply duct 7 and one or more heat exchangers 12 intersecting. The exhaust-side heat exchange section 9 and the supply-side heat exchange section 10 are connected at one end (gas-phase side end) of the heat exchanger 12 by a gas-phase side connection pipe 13 and at the other end (liquid-phase side end). 1) One or more closed circuits are formed by connecting the liquid-side connection pipes 14 to each other. Refrigerant (for example, chlorofluorocarbon gas or CO 2 gas) is sealed in the closed circuit. As the heat exchanger 12, a steel pipe in which spine-like fins are formed on the peripheral surface, a steel pipe in which many plate fins are fitted, and the like are used.
[0015]
Further, since the exhaust-side heat exchange section 9 recovers exhaust heat from the inside air exhausted from the kitchen, dirt easily adheres to the outer periphery of the heat exchanger 12. Therefore, a cleaning mechanism (not shown) for discharging the cleaning liquid to the heat exchanger for cleaning may be provided. A filter 15 for preventing dust and insects from entering is provided upstream of the air supply side heat exchange unit 10 in the air supply direction.
[0016]
A refrigerant circulation pump 16 is provided in a part of the liquid-side connection pipe 14. The refrigerant circulation pump 16 sends out the refrigerant in the liquid-side connection pipe 14 to the exhaust-side heat exchange section 9 and circulates through the closed circuit. The refrigerant in the liquid-phase connection pipe 14 is sent into the exhaust-side heat exchange unit 9 by the circulation pump 16, and the exhaust-side heat exchange unit 9 absorbs heat from the high-temperature exhaust gas to vaporize. The vaporized refrigerant is sent to the air-supply-side heat exchange unit 10 through the gas-phase-side connection pipe 13, and the heat is radiated to the low-temperature air supply and liquefied by the air-supply-side heat exchange unit 10. The liquefied refrigerant flows down to the liquid-side connection pipe 14 again and is collected. The exhaust heat is recovered by repeating such a circulation cycle. Thus, when ventilation is performed in the kitchen 1, the exhaust gas discharged from the exhaust duct 6 is cooled and exhausted when passing through the exhaust-side heat exchange unit 9, and the air supplied from the air supply duct 7 is supplied by the air supply. When passing through the side heat exchange unit 10, the air is heated and taken in.
It is desirable that the refrigerant circulation pump 16 is provided at a position lower than the air supply side heat exchange unit 10. In the heat exchanger 12 of the air supply side heat exchange unit 10, the refrigerant that has changed its phase from the gas phase to the liquid phase is allowed to flow naturally and is efficiently collected, and is again passed through the liquid phase connection pipe 14 to the exhaust side heat exchange unit 9. This is for sending the heat to the heat exchanger 12.
[0017]
As described above, since the exhaust-side heat exchange unit 9 and the supply-side heat exchange unit 10 are connected by pipes at both ends of the heat exchanger 12, a closed circuit in which the refrigerant is sealed is formed. The exhaust heat recovery apparatus 11 can be installed with a simple configuration without being restricted by the layout of the air supply port 4 and the air supply port 5, and the discomfort associated with ventilation can be eliminated. In addition, the heating efficiency can be improved in combination with the air conditioner to reduce energy consumption. Therefore, the exhaust heat recovery device 11 can be installed not only in a newly-built building but also in an existing building such as a tenant building, a rental store, or a second-hand house, and energy saving can be achieved.
In addition, by providing the refrigerant circulation pump 16 in a part of the liquid-side connection pipe 14, a required circulation amount of the refrigerant circulating in the closed circuit can be secured.
[0018]
In FIG. 2, when the exhaust heat recovery conditions are exemplified, the inside air temperature (exhaust gas temperature) is designed to be 35 ° C., the exhaust gas temperature is 15 ° C., the outside air temperature is −5 ° C., and the supply air temperature is 15 ° C. The heat exchange is performed. Have been. The exhaust-side heat exchange section 9 and the supply-side heat exchange section 10 are each provided with four heat exchangers 12, that is, provided with four closed circuits through which the refrigerant circulates. The temperature efficiency per circuit is assumed to be 20%, and the temperature efficiency of the entire system is designed to be 50%. Assuming that the amount of fuel consumed in the kitchen is 142,400 kal / h, 71,200 kal / h corresponding to 50% can be recovered.
[0019]
The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and the heat exchange provided in the exhaust-side heat exchange unit 9 and the supply-side heat exchange unit 10 is described. The number of devices 12 (the number of closed circuits) is not limited to four, and may be less or more. The refrigerant sealed in the heat exchanger 12 is not limited to Freon gas or CO 2 gas, but may be another medium as long as the medium undergoes a phase change due to exhaust heat. In addition, the exhaust heat recovery device 11 can be applied not only to a kitchen for eating and drinking business, but also to a kitchen for general home use, and is not limited to the kitchen, and may be a bathroom or a living room, and does not deviate from the spirit of the law. Of course, many modifications can be made within the scope.
[0020]
【The invention's effect】
As described above, in the present invention, since the exhaust-side heat exchange unit and the air-supply-side heat exchange unit are connected by piping at both ends of the heat exchanger to form a closed circuit in which the refrigerant is sealed, the exhaust port of the building is The exhaust heat recovery device can be installed with a simple configuration without being limited by the layout of the air supply port and the discomfort caused by ventilation can be eliminated. In addition, the heating efficiency can be improved in combination with the air conditioner to reduce energy consumption. Therefore, the exhaust heat recovery device can be installed not only in a newly built building but also in an existing building, and energy saving can be achieved.
In addition, by providing a circulation pump in a part of the liquid phase side connection pipe, a required circulation amount of the refrigerant circulating in the closed circuit can be secured.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view of an exhaust heat recovery device.
FIG. 2 is an explanatory diagram showing a piping route of the exhaust heat recovery device.
FIG. 3 is a layout diagram illustrating an example of an exhaust heat recovery device installed in a restaurant.
FIG. 4 is an explanatory diagram of a conventional exhaust heat recovery device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Kitchen 2 Guest room 3 Partition 4 Exhaust port 5 Air supply port 6 Exhaust duct 7 Air supply duct 8 Air supply fan 9 Exhaust side heat exchange part 10 Air supply side heat exchange part 11 Exhaust heat recovery device 12 Heat exchanger 13 Gas phase side Connection pipe 14 Liquid phase connection pipe 15 Filter 16 Refrigerant circulation pump

Claims (2)

建物内の内気を建物外へ排気する際に排熱回収し、回収された排熱を利用して建物内へ給気される外気を暖気する排熱回収装置において、
建物内の内気を排出する排気ダクトの排気路と熱交換器が交差して配設された熱交換部と、建物内に外気を取り込む給気ダクトの給気路と熱交換器が交差して配設された熱交換部とが設けられ、前記排気側熱交換部と給気側熱交換部とが熱交換器の両端を配管接続されて冷媒が封入された閉回路が形成され、液相側接続配管に設けられた循環用ポンプにより冷媒を送り出して相変化を繰り返して前記閉回路内を循環する際に熱交換が行われて排熱回収することを特徴とする排熱回収装置。
In an exhaust heat recovery device that recovers exhaust heat when exhausting the inside air inside the building to the outside of the building and uses the recovered exhaust heat to warm the outside air supplied into the building,
The heat exchange section is located at the intersection of the heat exchanger and the exhaust path of the exhaust duct that discharges inside air in the building, and the heat exchanger intersects with the supply path of the air supply duct that takes in outside air into the building. A heat exchange section is provided, and the exhaust-side heat exchange section and the supply-side heat exchange section are connected by piping at both ends of the heat exchanger to form a closed circuit in which a refrigerant is sealed, and a liquid phase An exhaust heat recovery apparatus, wherein when a refrigerant is sent out by a circulation pump provided in a side connection pipe and a phase change is repeated to circulate through the closed circuit, heat exchange is performed to recover exhaust heat.
前記循環用ポンプにより液相側接続配管内の冷媒が前記排気側熱交換部へ送り込まれ、該排気側熱交換部で高温の排気から吸熱して蒸気化し、該蒸気化した冷媒が気相側接続配管を通じて給気側熱交換部へ送り込まれ、該給気側熱交換部で低温の給気へ放熱して液化した冷媒が再度液相側接続配管へ自然流下して循環するサイクルを繰り返すことにより排熱回収することを特徴とする請求項1記載の排熱回収装置。The refrigerant in the liquid-phase connection pipe is sent to the exhaust-side heat exchange unit by the circulation pump, and the refrigerant in the exhaust-side heat exchange unit absorbs heat from the high-temperature exhaust gas and vaporizes. A cycle in which the refrigerant that is sent to the air supply side heat exchange section through the connection pipe, radiates heat to the low-temperature air supply in the air supply side heat exchange section, and is liquefied and flows naturally again to the liquid side connection pipe to circulate is repeated. The exhaust heat recovery device according to claim 1, wherein the exhaust heat recovery is performed by:
JP2002310461A 2002-10-25 2002-10-25 Waste heat recovering device Withdrawn JP2004144400A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011101694A1 (en) * 2010-02-16 2011-08-25 Pal Peter Set of equipment for reducing the energy consumption of buildings containing source units and building engineering units generating waste heat
CN106196309A (en) * 2016-09-30 2016-12-07 山东大学 A kind of collection air-treatment, energy regenerating, the multi-functional new wind all-in-one of oxygen supplement
CN111013322A (en) * 2019-12-24 2020-04-17 浙江大学 Novel air separation purification device and method based on double waste heat utilization
JP2020186906A (en) * 2009-11-19 2020-11-19 フィパック・リサーチ・アンド・ディベロップメント・カンパニー Method and apparatus for operating ducted fumehoods with increased energy efficiency
JP2022034891A (en) * 2020-08-19 2022-03-04 ミサワホーム株式会社 Room ventilation structure

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020186906A (en) * 2009-11-19 2020-11-19 フィパック・リサーチ・アンド・ディベロップメント・カンパニー Method and apparatus for operating ducted fumehoods with increased energy efficiency
WO2011101694A1 (en) * 2010-02-16 2011-08-25 Pal Peter Set of equipment for reducing the energy consumption of buildings containing source units and building engineering units generating waste heat
CN106196309A (en) * 2016-09-30 2016-12-07 山东大学 A kind of collection air-treatment, energy regenerating, the multi-functional new wind all-in-one of oxygen supplement
CN106196309B (en) * 2016-09-30 2022-12-16 山东大学 Fresh air all-in-one machine integrating air treatment, energy recovery and oxygenation functions
CN111013322A (en) * 2019-12-24 2020-04-17 浙江大学 Novel air separation purification device and method based on double waste heat utilization
JP2022034891A (en) * 2020-08-19 2022-03-04 ミサワホーム株式会社 Room ventilation structure
JP7547117B2 (en) 2020-08-19 2024-09-09 ミサワホーム株式会社 Room ventilation structure and building

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