JP2007057148A

JP2007057148A - Heat pump water heater

Info

Publication number: JP2007057148A
Application number: JP2005242109A
Authority: JP
Inventors: 康孝 ▲徳▼永; Yasutaka Tokunaga; Kenji Shirai; 健二白井; Masayuki Hamada; 真佐行濱田
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2005-08-24
Filing date: 2005-08-24
Publication date: 2007-03-08

Abstract

<P>PROBLEM TO BE SOLVED: To accurately detect a decrease in heating ability by using a temperature detecting means installed at the entrance of an evaporator. <P>SOLUTION: The temperature detecting means installed at the entrance of the evaporator is used to enhance the accuracy of detecting a decrease in the heating ability and to prevent malfunctions due to frost growth. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、圧縮機、給湯用熱交換器、膨張弁、及び蒸発器を配管で接続したヒートポンプ回路と貯湯槽、流体循環ポンプを配管で接続した流体回路を有したヒートポンプ給湯装置の除霜運転に関する。 The present invention relates to a defrosting operation of a heat pump water heater having a compressor, a hot water supply heat exchanger, an expansion valve, and a heat pump circuit in which an evaporator is connected by a pipe, a hot water tank, and a fluid circuit in which a fluid circulation pump is connected by the pipe. About.

従来の技術では、蒸発器の温度を検出するためのセンサが二つ設置されている場合、通常は蒸発器の出口に設置された温度検知手段を用いて除霜運転開始の判定を行い、除霜運転を開始する。除霜運転開始後も蒸発器の出口に設置された温度検知手段を用いて除霜運転の終了判定を行うことが提案されている（例えば、特許文献1参照）。
特開２００５−１４７６０９号公報 In the conventional technology, when two sensors for detecting the temperature of the evaporator are installed, the temperature detection means usually installed at the outlet of the evaporator is used to determine the start of the defrosting operation. Start frost operation. It has been proposed to determine the end of the defrosting operation using the temperature detection means installed at the outlet of the evaporator even after the start of the defrosting operation (see, for example, Patent Document 1).
JP-A-2005-147609

しかしながら、前記従来の構成では、着霜などによる蒸発器の吸入圧力低下に伴う加熱能力の低下の際、ガス不足や蒸発器のパスバランスが崩れた際に蒸発器の出口に設置された温度検知手段では加熱能力の低下を正確に検知することが難しいという課題があった。本発明は、上記従来の課題を解決するもので、蒸発器の入口に設置した温度検知手段を用いて、加熱能力の低下を正確に検知することを目的とする。 However, in the conventional configuration, when the heating capacity is reduced due to a decrease in the suction pressure of the evaporator due to frost formation or the like, the temperature detection installed at the outlet of the evaporator when the gas shortage or the path balance of the evaporator is broken There is a problem that it is difficult for the means to accurately detect a decrease in heating capacity. SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to accurately detect a decrease in heating capacity using a temperature detection means installed at the inlet of an evaporator.

前記従来の課題を解決するために、本発明のヒートポンプ式給湯装置は、圧縮機、給湯用熱交換器、膨張弁、および蒸発器を配管で接続したヒートポンプ回路と、貯湯槽、流体循環ポンプ、給湯用熱交換器を配管で接続した循環回路を有したヒートポンプ給湯装置であって、蒸発器の入口に設置された温度検知手段を用いて除霜運転の開始条件を判定し、流体循環ポンプの流量を低下させた後、膨張弁の開度を開くものである。 In order to solve the conventional problems, a heat pump type hot water supply apparatus of the present invention includes a heat pump circuit in which a compressor, a hot water heat exchanger, an expansion valve, and an evaporator are connected by piping, a hot water storage tank, a fluid circulation pump, A heat pump hot water supply apparatus having a circulation circuit in which a heat exchanger for hot water supply is connected by piping, using a temperature detection means installed at the inlet of the evaporator to determine the defrosting operation start condition, After reducing the flow rate, the opening of the expansion valve is opened.

また、除霜運転開始後、蒸発器の出口に設置された温度検知手段を用いて除霜運転の終了条件を判定し、除霜運転を終了するものである。 In addition, after the start of the defrosting operation, the end condition of the defrosting operation is determined by using the temperature detection means installed at the outlet of the evaporator, and the defrosting operation is ended.

本発明のヒートポンプ式給湯装置は、除霜運転開始する条件判定に蒸発器の入口に設置された温度検知手段を用いることにより、加熱能力の低下を検知する精度を向上させ、霜の成長による機能不全を防止することができる。また、除霜運転の終了判定を蒸発器の出口に設置された温度検知手段を用いることにより、着霜状態を検知する精度を向上させ機能回復を円滑に行うことができる。 The heat pump type hot water supply apparatus of the present invention uses the temperature detection means installed at the inlet of the evaporator for the condition determination for starting the defrosting operation, thereby improving the accuracy of detecting a decrease in heating capacity and the function due to the growth of frost. Failure can be prevented. Moreover, the accuracy of detecting a frosting state can be improved and function recovery can be performed smoothly by using the temperature detection means installed at the outlet of the evaporator for determining whether the defrosting operation has ended.

第１の発明は、圧縮機、給湯用熱交換器、膨張弁、および蒸発器を配管で接続したヒートポンプ回路と、貯湯槽、流体循環ポンプ、給湯用熱交換器を配管で接続した循環回路を有したヒートポンプ給湯装置であって、蒸発器の入口に設置された温度検知手段を用いて除霜運転の開始条件を判定し、流体循環ポンプの流量を低下させた後、膨張弁の開度を開くことにより、加熱能力の低下を検知する精度を向上させ、霜の成長による機能不全を防止することが可能となる。 A first invention includes a heat pump circuit in which a compressor, a hot water heat exchanger, an expansion valve, and an evaporator are connected by piping, and a circulation circuit in which a hot water tank, a fluid circulation pump, and a hot water heat exchanger are connected by piping. The heat pump hot water supply device has a temperature detection means installed at the inlet of the evaporator to determine the defrosting operation start condition, and after reducing the flow rate of the fluid circulation pump, the opening of the expansion valve By opening, it is possible to improve the accuracy of detecting a decrease in heating capacity and prevent malfunction due to frost growth.

第２の発明は、第１の発明の判定方法により開始した除霜運転開始後、蒸発器の出口に設置された温度検知手段を用いて除霜運転の終了条件を判定し、除霜運転を終了すること
により、着霜状態を検知する精度を向上させ、機能回復を円滑に行うことが可能となる。 2nd invention determines the completion | finish conditions of defrost operation using the temperature detection means installed in the exit of an evaporator after the defrost operation start started by the determination method of 1st invention, and performs defrost operation. By ending, the accuracy of detecting the frosting state can be improved, and the function recovery can be performed smoothly.

（実施の形態１）
図１〜３は本発明の実施の形態１におけるヒートポンプ給湯装置と運転制御を示したものである。 (Embodiment 1)
1-3 show the heat pump hot-water supply apparatus and operation control in Embodiment 1 of this invention.

図１は、インバータ式圧縮機１１、給湯用熱交換器１２、減圧装置１３、蒸発器１４を冷媒配管１５により環状に接続して構成されたヒートポンプサイクルと、給湯用の液体を蓄える貯湯槽１６と、前記貯湯槽内の液体が前記給湯装置を介し循環できる液体配管１８と、前記液体配管に貯湯槽内の液体を流通させるポンプ１７と、前記蒸発器１４の入口に設置された温度検知手段２１と、前記蒸発器１４の出口に設置された温度検知手段２２と、前記ポンプの回転数を制御するマイクロコンピュータ３０を備えている。 FIG. 1 shows a heat pump cycle constituted by connecting an inverter type compressor 11, a hot water supply heat exchanger 12, a pressure reducing device 13, and an evaporator 14 in an annular shape by a refrigerant pipe 15, and a hot water storage tank 16 for storing hot water supply liquid. A liquid pipe 18 through which the liquid in the hot water tank can circulate through the hot water supply device, a pump 17 for circulating the liquid in the hot water tank through the liquid pipe, and temperature detection means installed at the inlet of the evaporator 14 21, temperature detecting means 22 installed at the outlet of the evaporator 14, and a microcomputer 30 for controlling the rotational speed of the pump.

図２は従来の運転制御の構成図であり、蒸発器１４の出口に設置された温度検知手段２２を用いて、除霜運転開始条件計算３１を行い、除霜運転開始判定３２により除霜運転３４を行う運転制御を有している。 FIG. 2 is a configuration diagram of the conventional operation control. The defrosting operation start condition calculation 31 is performed using the temperature detection means 22 installed at the outlet of the evaporator 14, and the defrosting operation start determination 32 is performed. The operation control which performs 34 is provided.

次に本実施例の作用を説明する。図３は、図１の構成により蒸発器１４の入口に設置された温度検知手段２３を用いて、除霜運転開始条件計算３１を行い、除霜運転開始判定３２により除霜運転３４を開始する制御を有していることで、加熱能力の低下を検知する精度を向上させ、霜の成長による機能不全を防止することができる。したがって、湯切れなどヒートポンプ給湯装置としての機能をそこなうことなく運転を継続することが可能となる。 Next, the operation of this embodiment will be described. 3 performs the defrosting operation start condition calculation 31 using the temperature detection means 23 installed at the inlet of the evaporator 14 with the configuration of FIG. 1, and starts the defrosting operation 34 by the defrosting operation start determination 32. By having control, the precision which detects the fall of a heating capability can be improved, and the malfunction by the growth of frost can be prevented. Therefore, it is possible to continue the operation without deteriorating the function as a heat pump hot water supply device such as running out of hot water.

（実施の形態２）
実施の形態1での判定方法により開始した除霜運転開始後、蒸発器の出口に設置された温度検知手段を用いて除霜運転の終了条件を判定し、除霜運転を終了することにより、着霜状態を検知する精度を向上させ、機能回復を円滑に行うことが可能となる。したがって、除霜運転終了後の湯切れなどヒートポンプ給湯装置としても機能を損なうことなく運転を継続することが可能となる。 (Embodiment 2)
After starting the defrosting operation started by the determination method in Embodiment 1, using the temperature detection means installed at the outlet of the evaporator to determine the end condition of the defrosting operation, by ending the defrosting operation, It is possible to improve the accuracy of detecting the frosting state and smoothly perform the function recovery. Therefore, the operation can be continued without impairing the function of the heat pump hot water supply device such as running out of hot water after the completion of the defrosting operation.

本発明の実施の形態１システムの構成ブロック図Embodiment 1 System Configuration Block Diagram of the Present Invention 本発明の実施の形態１におけるアルゴリズムのフローチャートFlowchart of algorithm in Embodiment 1 of the present invention 従来のアルゴリズムのフローチャートConventional algorithm flow chart

符号の説明Explanation of symbols

１１インバータ式圧縮機
１２給湯熱交換器
１３減圧装置（電気式膨張弁）
１４蒸発器
１５冷媒配管
１６貯湯槽
１７ポンプ（ウォータポンプ）
１８液体配管
１９ファン
２０ファンモータ
２１蒸発器入口温度センサ
２２蒸発器出口温度センサ
３０マイクロコンピュータ
３１蒸発器出口温度検知手段を用いた演算手段
３２除霜運転開始判定
３３通常運転
３４除霜運転
３５蒸発器出口温度検知手段を用いた演算手段
３６除霜運転終了判定
３７蒸発器入口温度検知手段を用いた演算手段 11 Inverter compressor 12 Hot water supply heat exchanger 13 Pressure reducing device (electric expansion valve)
14 Evaporator 15 Refrigerant Piping 16 Hot Water Tank 17 Pump (Water Pump)
DESCRIPTION OF SYMBOLS 18 Liquid piping 19 Fan 20 Fan motor 21 Evaporator inlet temperature sensor 22 Evaporator outlet temperature sensor 30 Microcomputer 31 Calculation means using evaporator outlet temperature detection means 32 Defrosting operation start determination 33 Normal operation 34 Defrosting operation 35 Evaporation Calculation means using evaporator outlet temperature detection means 36 Determination of completion of defrosting operation 37 Calculation means using evaporator inlet temperature detection means

Claims

圧縮機、給湯用熱交換器、膨張弁、および蒸発器を配管で接続したヒートポンプ回路と、貯湯槽、流体循環ポンプ、前記給湯用熱交換器を配管で接続した循環回路を有したヒートポンプ給湯装置であって、前記蒸発器の入口に設置された温度検知手段より除霜運転の開始条件を判定し、前記流体循環ポンプの流量を低下させた後、前記膨張弁の開度を開くことを特徴とするヒートポンプ給湯装置。 A heat pump water heater having a heat pump circuit in which a compressor, a hot water heat exchanger, an expansion valve, and an evaporator are connected by piping, a hot water storage tank, a fluid circulation pump, and a circulation circuit in which the hot water heat exchanger is connected by piping The temperature detecting means installed at the inlet of the evaporator determines the defrosting operation start condition, reduces the flow rate of the fluid circulation pump, and then opens the opening of the expansion valve. Heat pump water heater.

除霜運転開始後、前記蒸発器の出口に設置された温度検知手段により除霜運転の終了条件を判定し、除霜運転を終了することを特徴とする請求項１記載のヒートポンプ給湯装置。 The heat pump hot-water supply device according to claim 1, wherein after the defrosting operation is started, a defrosting operation end condition is determined by temperature detection means installed at an outlet of the evaporator, and the defrosting operation is ended.