JP5164634B2 - Heat pump water heater - Google Patents

Description

  The present invention relates to a heat pump water heater.

  A conventional heat pump water heater has a separate structure in which a hot water storage unit using a hot water storage tank having a large capacity (370 L to 560 L as an example) and a heat pump unit are separately provided. There is a hot water storage heat pump water heater that boils hot water in the middle of the night and stores it in a hot water storage tank, and uses the stored hot water during the day. In addition, the hot water is heated directly during the daytime when hot water is used, and the hot water directly heated is used to directly reduce the size of the hot water storage tank (45L-100L). There is a heat pump water heater.

  There exists Unexamined-Japanese-Patent No. 2003-156254 (patent document 1) as an example of the said hot water storage type heat pump water heater. Patent Document 1 is a hot water storage type having a 370 L large-capacity hot water storage tank, and basically performs tank boiling once a day at night.

  As the boiling control, when the amount of hot water used per day is 250 L or more, the entire amount of 370 L is heated, and then the boiling is performed when the amount of remaining hot water becomes 150 L or less. Also, when it is less than 250L, it is heated up to 250L and then heated up when the amount of remaining hot water becomes 75L or less. Is controlling.

  Next, as an example of a direct hot water supply type heat pump water heater, there is JP-A-2003-279133 (Patent Document 2). In Patent Document 2, hot water storage operation is performed in advance to store hot water (about 60 to 90 ° C) in a small hot water storage tank of 60 to 100L, and when using hot water, the heating temperature of the heat pump is set to an appropriate temperature (about 40 ° C). At the beginning of the operation that does not reach, the hot water from the hot water storage tank is mixed with the heating water of the 2-cycle heat pump to supply the water at an appropriate temperature, and when the heating temperature by the 2-cycle heat pump operation reaches the appropriate temperature, the hot water from the hot water storage tank is stopped. It is used by directly supplying hot water (about 40 ° C.) heated at the operation. Also, the amount of tank boiling and the boiling temperature are determined by the user's mode settings such as “saving” and “use more”. In general, the operating efficiency of heat pump operation, that is, the coefficient of performance (generally referred to as COP), is that the lower the heating temperature, the smaller the number of revolutions of the compressor and the less mechanical loss. Therefore, the lower the heating temperature, the coefficient of performance (COP). Can be improved. Further, the smaller the amount of hot water stored in the hot water storage tank, the smaller the amount of heat released, and the more energy can be saved.

JP 2003-156254 A JP 2003-279133 A

  In the conventional heat pump water heater, in the case of the hot water storage type, since it operates only at night, there is an advantage that the electricity bill can be inexpensive. However, since it has a large hot water storage tank of 370L to 560L, a heat pump unit is required separately from the hot water storage unit, and there are restrictions on installation such as installation area and installation strength. There was a risk of occurrence.

  On the other hand, in the case of the direct hot water supply type, the hot water storage unit and the heat pump unit can be integrated by greatly reducing the size of the hot water storage tank, and there is an advantage that the restrictions on installation and the risk of running out of hot water are eliminated. However, since direct hot water supply is the main component, the heat pump has to be set to two cycles, which increases costs and makes it impossible to use cheap electricity charges at night.

  As described above, the conventional heat pump water heater has advantages in both the hot water storage type and the direct hot water supply type, but has problems such as installation restrictions, running out of water, and electricity charges.

  On the other hand, to reduce the power consumption of heat pump water heaters, there are improvements in heat pump efficiency and heat insulation performance in hot water storage tanks. However, it is necessary to confirm long-term reliability such as the development of compressors in order to improve heat pump efficiency. It is difficult to obtain a sufficient effect for the examination period.

  Therefore, improvement of the heat retention performance of the hot water storage tank has been regarded as a more important issue. However, in the conventional heat pump water heater, the tank boiling amount and the boiling temperature are determined separately, and there are about two stages depending on the use mode. Since it was performed only roughly, it could not be said that it was sufficient as detailed power saving control corresponding to diversity, such as family members and daily changes in hot water usage.

  Also, since heat pump water heaters require a rise time of several minutes for the heating temperature to reach an appropriate temperature, it is important to minimize the number of heat pump operations, especially in the case of direct water heating, In this machine, this point was not the optimum operation control.

  In order to solve the above-mentioned conventional problems, an object of the present invention is to obtain a heat pump water heater that prevents hot water shortage and improves energy saving by optimizing the hot water storage temperature and amount of hot water in a hot water storage tank. .

The present invention relates to a compressor, a water-refrigerant heat exchanger that performs heat exchange between water and a refrigerant, a decompression device that depressurizes refrigerant from the water-refrigerant heat exchanger, and air that performs heat exchange between air and the refrigerant. A heat pump refrigerant circuit connected to a refrigerant heat exchanger, the water refrigerant heat exchanger, a hot water storage tank for storing water heat-exchanged in the water refrigerant heat exchanger, and a circulation pump for circulating water in the hot water storage tank A heat pump water heater comprising a hot water storage circuit, a tank hot water circuit for supplying hot water in the hot water storage tank from a hot water supply terminal, and an operation control means for controlling the operation of the heat pump water heater. In some cases, the operation of the heat pump refrigerant circuit is determined according to the hot water usage mode and time zone.

  According to the present invention, by optimizing the hot water storage temperature and amount of hot water stored in a hot water storage tank, it is possible to obtain a heat pump water heater that prevents hot water shortage and has improved energy saving.

  Hereinafter, embodiments of the heat pump water heater of the present invention will be described with reference to the drawings.

  An embodiment of the present invention will be described below with reference to FIGS.

  FIG. 1 shows an example of a component structure when the present invention is applied to a direct hot water supply type heat pump water heater. The heat pump water heater includes a heat pump refrigerant circuit 30, a hot water supply circuit 40, and an operation control means 50.

  The heat pump refrigerant circuit 30 includes a compressor 1, a refrigerant-side heat transfer tube 2a disposed in a water-refrigerant heat exchanger 2 that performs heat exchange between water and a refrigerant, a decompressor 3 that decompresses refrigerant from the water-refrigerant heat exchanger, and air The air refrigerant heat exchanger 4 that exchanges heat with the refrigerant is sequentially connected via refrigerant pipes, and the refrigerant is enclosed therein.

  The compressor 1 is capable of capacity control, and is operated with a large capacity when supplying a large amount of hot water. Here, the compressor 1 can perform rotation speed control from low speed (for example, 700 rotations / minute) to high speed (for example, 7000 rotations / minute) by PWM control, voltage control (for example, PAM control) and combination control thereof. ing.

  The water refrigerant heat exchanger 2 includes a refrigerant side heat transfer tube 2a and a water supply side heat transfer tube 2b, and is configured to exchange heat between the refrigerant side heat transfer tube 2a and the water supply side heat transfer tube 2b.

  As the decompression device 3, an electric expansion valve is generally used, and the medium temperature and high pressure refrigerant sent through the water refrigerant heat exchanger 2 is decompressed and sent to the air refrigerant heat exchanger 4 as a low pressure refrigerant that easily evaporates and the refrigerant circulation amount And the function of a defrosting device that melts frost by fully opening the throttle amount and sending a large amount of medium temperature refrigerant to the air refrigerant heat exchanger 4.

  The air refrigerant heat exchanger 4 takes in outside air by rotation of a blower fan (not shown), exchanges heat between the air and the refrigerant, and absorbs heat from the outside air.

  Next, the hot water supply circuit 40 includes a water circulation circuit for performing hot water storage, direct hot water supply, tank hot water supply, bath hot water filling, and bath reheating.

  The hot water storage tank 9 for storing the water heat-exchanged by the water refrigerant heat exchanger has a capacity of 150L to 250L and is significantly smaller than the conventional hot water storage tanks (370L to 560L), so that it can be integrated with the heat pump refrigerant circuit 30. Plan.

  Next, the basis for selecting the tank capacity will be described. Generally, it is said that the usage amount of the appropriate temperature water (about 40 ° C.) in a family of 3 to 4 people is about 400 L to 450 L per day including 180 L of bath water. In winter when the amount of heat used by hot water is the highest, the total amount of hot water stored at night, the amount of hot water stored as needed, and the amount of direct hot water is selected as a guideline at 400 ° C. In addition, when there are many hot water storage operations and direct hot water supply operations at any time, the electricity charge during the daytime is higher than that at night. Limit the amount used to 20% or less. Assuming that the amount of heat of heating of water is almost proportional to the amount of electricity, the tank capacity (L) x 90 ° C x 1.2 times is added to winter water (about 9 ° C) and used as a suitable temperature water of 40 ° C. When the tank capacity is determined to be ℃ × 450L, the tank capacity is 153L, but the minimum value is set to 150L in consideration of the decrease in the number of family members.

  The upper limit of the tank capacity is selected from the viewpoint of weight reduction. Even if the mass of the conventional hot water storage heat pump water heater is the lightest, the total of the hot water storage unit and the heat pump unit is 120 kg or more, and it reaches about 500 kg when the machine is full. It was. Therefore, by integrating the hot water storage unit and the heat pump unit and reducing the size of the tank, the total product is 100 kg or less and the tank capacity is 250 L. As a result, even when the aircraft is in full use, the total mass is about 350 kg, which is 30% lower than before.

  In other words, by setting the tank capacity to 150L to 250L, the tank capacity is reduced by 60% to 30% compared to the conventional model, and the weight during use is reduced by 30%. Can be planned.

  The daytime electricity usage was set to 20% or less of the nighttime electricity usage. However, the daytime electricity usage is not limited to this, and the daytime electricity usage is less than the total daytime electricity usage. It may be 20% or less, and a ratio of 20% may be selected between about 10% and 30% depending on whether the electricity cost or the amount of hot water is given priority. In addition, since the effect of daytime operation is less at 10% or less, and the electricity cost increases by daytime operation at 30% or more, the range between about 10% and 30% is an appropriate range.

  The hot water storage circuit is a water circuit for circulating low temperature water at the bottom of the hot water storage tank 9 and storing it as hot water from the upper part of the hot water storage tank by the tank boiling operation. The hot water storage tank 9, the tank circulation pump 10, the hydrothermal AC sensor 11, and the water supply side A heat transfer pipe 2b, a hot water supply mixing valve 12, and a hot water storage tank 9 are sequentially connected via a water pipe.

  Next, the direct hot water supply circuit includes a water supply fitting 5, a pressure reducing valve 6, a water supply water amount sensor 7, a water supply check valve 8, a water heat AC amount sensor 11, a water supply side heat transfer pipe 2b, a hot water supply mixing valve 12, a hot water mixing valve 14, A flow rate adjusting valve 15 and a kitchen tapping metal fitting 16 are sequentially connected via a water pipe. The water supply fitting 5 is connected to a water supply source such as a water supply, and the kitchen tap metal fitting 16 is connected to a kitchen faucet 17 or the like.

  Next, the tank hot water supply circuit includes a water supply fitting 5, a pressure reducing valve 6, a water supply amount sensor 7, a water supply check valve 8, a hot water storage tank 9, a hot water supply mixing valve 12, a hot water mixing valve 14, a flow rate adjusting valve 15, and a kitchen hot water supply fitting 16. Are sequentially connected via a water pipe.

  Next, the bath hot water filling circuit includes a water supply fitting 5, a pressure reducing valve 6, a water supply amount sensor 7, a water supply check valve 8, a hydrothermal AC amount sensor 11, a water supply side heat transfer tube 2b, a hot water supply mixing valve 12, and a hot water mixing valve 14. , A flow rate adjustment valve 15, a bath pouring valve 18, a flow switch 19, a bath circulation pump 20, a water level sensor 21, a bath inlet / outlet fitting 22, a bath circulation adapter 23, and a bathtub 24 are sequentially connected via a water pipe. Yes. During bath hot water filling, hot water supply from the hot water storage tank 9 to the bathtub 24 is performed in a range where the amount of hot water in the hot water storage tank 9 does not fall below the minimum required amount, together with direct hot water supply by the bath hot water filling circuit.

  Next, the bath memory circuit includes a bath 24, a bath circulation adapter 23, a bath inlet / outlet fitting 22, a water level sensor 21, a bath circulation pump 20, a flow switch 19, a bath water heat transfer tube 26b of a bath heat exchanger 26, a bath. A hot metal fitting 25, a bath circulation adapter 23, and a bathtub 24 are sequentially connected through a water pipe. At the time of bathing, hot water heated by the water / refrigerant heat exchanger 2 by operating the heat pump operation and the tank circulation pump 10 and opening the hot water on / off valve 28 together with the water circulation of the bath water by the bath chasing circuit. Is circulated through a hot water heat transfer pipe 26a provided in the bath heat exchanger 26, heat is exchanged between the hot water heat transfer pipe 26a and the bath water heat transfer pipe 26b, and the bath circulating water is heated.

  Next, the operation control means 50 performs operation / stop of the heat pump refrigerant circuit 30 and control of the rotation speed of the compressor 1 according to operation settings of the kitchen remote controller 51 and the bath remote controller 52, and also adjusts the refrigerant throttle amount of the decompression device 3. Operation / stop of the tank circulation pump 10 and bath circulation pump 20 and hot water mixing valve 12, hot water mixing valve 14, flow rate adjusting valve 15, bath pouring valve 18 and hot water on / off valve 28 to control hot water storage operation and direct hot water supply Operation, tank hot water supply operation, bath hot water operation, and bath memorial operation are performed.

  Moreover, the operation control means 50 controls the rotation speed of the compressor 1, and immediately after the start of operation, the operation control means 50 operates at a predetermined high speed rotation speed in order to shorten the heating start-up time. In this case, control is performed so that the engine is operated at a low speed corresponding to the heating temperature.

  Further, the operation control means 50 has a night hot water storage operation means and an optional heat pump operation means, sets five or more tank boiling levels combining the boiling amount of the hot water storage tank and the boiling temperature, and the tank boiling The hot water storage operation is performed once a day based on the raised level.

  Further, the heat pump water heater includes a thermistor (not shown) for detecting the temperature of each part and a discharge pressure of the compressor 1 in addition to the tank thermistors 9a to 9e for detecting the hot water storage temperature and the amount of hot water stored in the hot water storage tank 9. A pressure sensor (not shown) for detecting the water level, a water level sensor 21 for detecting the water level in the bathtub 24, and the like are provided, and each detection signal is input to the operation control means 50. The operation control means 50 controls each component based on these signals. The hot water supply mixing valve 12 is initially open between the water / refrigerant heat exchanger 2 side and the hot / cold water mixing valve 14 side and between the hot water tank 9 side and the hot / cold water mixing valve 14 side at the beginning of the hot water supply operation. When hot water is supplied from both the exchanger 2 and the hot water storage tank 9 and the heating temperature in the water / refrigerant heat exchanger 2 by the heat pump reaches the hot water supply temperature (about 40 ° C.), the hot water storage tank 9 side and the hot water mixing valve 14 side are closed. Thus, hot water is supplied only from the water / refrigerant heat exchanger 2.

  Moreover, the hot water on-off valve 28 is provided between the water refrigerant heat exchanger 2 and the bath heat exchanger 26, and is opened when bathing is performed to perform bath bathing operation, and at other times, the water circuit is closed. Therefore, the water supply check valve 8 is for preventing water from flowing back only in one direction and preventing backflow.

  Next, regarding the operation of the heat pump water heater of the present embodiment, referring to the heat pump refrigerant circuit 30 and the hot water supply circuit 40 of FIG. 1, the flowchart of FIG. 2, the time table of FIG. 3, and the tank boiling level of FIG. This will be described based on an example.

  FIG. 2 is an example of a flowchart showing a hot water supply operation and subsequent operation control when the kitchen faucet 17 and the like are opened and hot water is used in an intermediate period (spring, autumn).

  When the kitchen faucet 17 is opened and the use of hot water is started (step 61), the operation control means 50 starts tank hot water supply by the tank hot water supply circuit, and supplies hot water (about 65 ° C.) to the hot water storage tank 9 (about 17 ° C.). Are mixed with the hot water mixing valve 14 and hot water is supplied from the kitchen faucet 17 and the like as appropriate temperature water (about 40 ° C.) (step 62).

  At the same time, the tank thermistors 9a to 9e detect the temperature and measure the amount of remaining hot water in the tank (step 63), determine the time table in FIG. 3 (step 64), and perform the heat pump operation as needed for each time zone in advance by the time table. Determine the operating conditions of the means.

  Here, an example of the time table will be described with reference to FIG. First, there are three items as the remaining tank amount, usage mode, and time zone.

  The total capacity of the tank is 200L, the remaining hot water volume is divided into three stages of 100L or more, 50-100L, 50L or less, the use mode is divided into bath hot water and other, and the time zone is from 7am to 13:00, 13:00 It is divided into 3 stages from -21pm and after 21:00. Here, bath hot water is separated from others because hot water bathing (approx. 30 minutes) uses an extremely large amount of hot water compared to washing and dishwashing (within approximately 5 minutes) during hot water supply. is there.

  In case 6, the amount of remaining hot water is 100L or more, so the heat pump does not operate and only the tank hot water is available. However, in case 5, the amount of remaining hot water is 100L or more, but the bath is filled with hot water at 13:00. If it is before, there is a high possibility of refilling at night, so hot water is supplied directly to secure the remaining hot water. In cases 2 and 4, when the amount of remaining hot water is reduced during use other than bath hot water filling, in this case, hot water storage operation is performed after the use of hot water depending on the time zone. In cases other than bathing with hot water, hot water storage operation is not performed directly, but in the case of washing, dishwashing, etc., it is often used for a very short time (about 1 minute). In this case, the hot water storage operation (about 20 minutes as 100 L) is more efficient than the direct hot water supply operation. FIG. 3 is an example for explaining the time table, and the sorting method and the operating conditions are not limited thereto.

  Returning to FIG. 2, according to the time table determination (step 64), any one of hot water storage operation (step 65), direct hot water supply operation (step 66), and heat pump operation (step 67) is performed. In the case of direct hot water supply operation (step 66), the operation is performed in parallel with the tank hot water supply. In the case of hot water storage operation (step 65), use of hot water is completed (step 68), and the tank hot water supply is stopped (step 69). Is called.

  Further, since the control from (Step 62) to (Step 67) is performed on the electronic circuit by the heat pump operation means as needed, in the case of direct hot water supply, the heat pump operation is started almost simultaneously with the tank hot water supply.

  Next, a case where the direct hot water supply operation is performed in parallel with the tank hot water supply operation will be described. The operation control means 50 includes a water supply fitting 5, a pressure reducing valve 6, a water supply amount sensor 7, a water supply check valve 8, a hot water storage tank 9, a hot water supply mixing valve 12, a hot water mixing valve 14, a flow rate adjusting valve 15, a kitchen tapping metal fitting 16, a kitchen faucet. The tank hot water supply operation is started by the tank hot water supply circuit 17 (step 62). Simultaneously, the compressor 1 is operated to start the operation of the refrigerant circuit 30 of the heat pump, and the water supply fitting 5, the pressure reducing valve 6, the water supply water amount sensor 7, the water supply check valve 8, the water heat AC amount sensor 11, and the water supply side heat transfer tube. The direct hot water supply operation is started by the direct hot water supply circuit of 2b, the hot water mixing valve 12, the hot water mixing valve 14, the flow rate adjusting valve 15, the kitchen outlet 16 and the kitchen faucet 17 (step 66).

  Here, the heat pump refrigerant circuit 30 sends the high-temperature high-pressure refrigerant compressed by the compressor 1 to the refrigerant-side heat transfer tube 2a of the water-refrigerant heat exchanger 2, and the water flowing in the water-supply-side heat transfer tube 2b is heated to mix hot water. Although it flows out to the valve 12 side, at the time of start-up immediately after operation, the refrigerant sent to the water-refrigerant heat exchanger 2 is not sufficiently high-temperature and high-pressure, so the temperature is low and the whole water-refrigerant heat exchanger 2 is cooled. The heating ability to heat water is not enough. As the time elapses, the refrigerant becomes high temperature and pressure, and accordingly, the amount of heat released from the generated refrigerant increases, and the ability to heat water increases.

  Since it takes about 1 minute for the heating capacity of the heat pump operation to reach an appropriate temperature state, the operation control means 50 increases the amount of hot water supplied to the tank when the mixed hot water temperature after the hot water supply mixing valve 12 is lower than the appropriate temperature, and is higher than the optimal temperature. In this case, the hot water supply mixing valve 12 is operated so as to reduce the amount of hot water supply in the tank, and the flow rate ratio is adjusted to obtain an appropriate temperature. Furthermore, it is possible to adjust the hot water supply temperature to the terminal in use by adjusting the amount of water supplied from the hot water mixing valve 14.

  The use of hot water as described above and the heat pump operation means are repeatedly performed as needed, and when the daily hot water use is completed (step 70), the amount of remaining hot water in the tank is measured (step 71), and boiling in the forced forced hot water storage operation means at night is performed. The raising level is determined (step 72).

  Next, an example of tank boiling operation condition setting for each tank boiling level during the forced night hot water storage operation with a tank capacity of 200 L will be described with reference to FIG. The conditions for determining the tank boiling level are divided into levels 1 to 9 according to the combination of the remaining hot water temperature and the remaining hot water amount, and the tank boiling operating conditions as shown in the right column are determined. The remaining hot water temperature is an estimate of the boiling temperature of the previous day. In this example, there are three types of boiling temperatures of 65 ° C, 75 ° C, and 90 ° C. To do.

  The amount of remaining hot water is divided into 150L or more, 50-150L, and less than 50L, and estimates the daily usage. For example, when the amount of remaining hot water is 150 L or more as in Level 1, Level 4 and Level 7, the amount of hot water used is less than 50 L, and heating is not required regardless of the remaining hot water temperature. When the amount of remaining hot water is less than 50L, the amount of hot water used is 100L or more, and the entire amount of 200L is boiled regardless of the remaining hot water temperature.

  When the state of 150L or more or less than 50L continues for 3 consecutive days, the boiling temperature is changed regardless of the outside air temperature or the like. For example, if level 4 continues for 3 consecutive days, the level is changed to level 2. Similarly, if level 7 continues for 3 consecutive days, the level is changed to level 5. Here, setting level 2 instead of level 4 to level 3 means that the amount of heat stored in level 2 is 65 ° C x 150L = 9750 kcal compared to the amount of heat used in level 4 of 75 ° C x 50L = 3750 kcal. by. If level 3 continues for 3 consecutive days, the level is changed to level 5. If level 6 continues for 3 consecutive days, the level is changed to level 8.

  In addition, the tank boiling start time can be improved by reducing the amount of heat released from the tank after hot water storage as it is delayed, but it is necessary to consider the required boiling time determined by the boiling temperature and the amount of boiling. . It should be noted that the tank boiling level determination condition in FIG. 4 is an example in consideration of the fact that there are many changes in the amount of hot water used every day, and both the level determination condition and the boiling operation condition are not limited to this method.

  Returning to FIG. 2, the tank boiling level is determined (step 72), and when the boiling start time according to the tank boiling operation condition is reached, the heat pump operation is started and the night hot water storage operation is started (step 73). Next, it is determined whether or not the boiling has been completed (step 74). When the boiling temperature and the boiling amount according to the tank boiling operation conditions are reached, it is determined that the boiling has been completed, the tank boiling is completed, and the heat pump operation is stopped ( Step 75).

  As described above, in this embodiment, in the heat pump water heater in which the hot water storage tank is miniaturized and the heat pump refrigerant circuit and the hot water storage tank are integrated, the heat pump operation time in the daytime is a predetermined ratio to the heat pump operation time in the nighttime or the day. It is related with the control means to suppress. Using a heat pump refrigerant circuit, the hot water storage tank has a capacity of about 150L to 250L larger than the conventional direct hot water supply type (60 to 100L) and smaller than the hot water storage type (370L to 560L), and a hot water storage unit and a heat pump unit The operation control means is provided with heat pump operation means at any time together with nighttime hot water storage operation means to eliminate hot water outage, and the daytime heat pump operation time is changed to night heat pump operation time. On the other hand, the electricity bill is reduced by keeping the ratio below 10% to 30%.

  Further, according to this embodiment, by setting the tank boiling level of five or more stages combining the boiling amount and the boiling temperature of the hot water storage tank, and performing the night hot water storage operation means based on the tank boiling level. The hot water storage temperature and the amount of hot water storage can be optimized. In addition to optimizing nighttime hot water storage operation and setting the daytime heat pump operation ratio corresponding to hot water storage tank capacity and nighttime discount electricity billing system, it is possible to save energy and save electricity bill. .

  The present invention can be applied not only to the direct hot water supply type heat pump water heater described in the first embodiment but also to a hot water storage type heat pump water heater. Hereinafter, an embodiment when the present invention is applied to a hot water storage type heat pump water heater will be described with reference to FIG.

  FIG. 5 shows an example of a component structure when the present invention is applied to a hot water storage type heat pump water heater. The heat pump water heater is composed of the heat pump refrigerant circuit 30, the hot water supply circuit 40, and the operation control means 50, which is the same as the direct hot water supply system. The difference is that the hot water supply circuit 40 has tank hot water storage, tank hot water, bath hot water, bath. It is composed of a remedy circuit and does not have a direct hot water supply circuit.

  Since most of the component configurations of the heat pump water heater are similar, each reference numeral is the same as in FIG. 1 of the first embodiment, and only differences will be described.

  The heat pump refrigerant circuit 30 is different from the capacity of the compressor 1 and the structure of the water refrigerant heat exchanger 2 due to the difference in heating capacity, but the circuit is the same as in FIG.

  The hot water supply circuit 40 does not have the hot water mixing valve 12 of FIG. 1 of the first embodiment, but has a tank hot water storage valve 13a and a tank hot water supply valve 13b instead.

  At the time of tank hot water storage, the tank hot water valve 13a is opened simultaneously with the heat pump operation, the tank hot water valve 13b is closed, the hot water storage tank 9, the tank circulation pump 27, the hydrothermal AC sensor 11, the water refrigerant heat exchanger 2, and the tank hot water valve. 13a, in the water circulation circuit of the hot water storage tank 9, the cold water in the lower side of the hot water storage tank 9 is heated by the water refrigerant heat exchanger 2 to store hot water from the upper side of the hot water storage tank 9.

  At the time of tank hot water supply, the heat pump operation is not performed, the tank hot water valve 13a is closed, the tank hot water valve 13b is opened, the water supply fitting 5, the pressure reducing valve 6, the water supply amount sensor 7, the hot water storage tank 9, the tank hot water supply valve 13b, hot water mixing Hot water is supplied from the upper side of the hot water storage tank 9 by the water circulation circuit of the valve 14, the flow rate adjusting valve 15, the kitchen outlet 16, and the kitchen faucet 17. The tank hot water storage valve 13a and the tank hot water supply valve 13b may be integrated like the hot water supply mixing valve 12 described in FIG.

  In the same way as when using the kitchen faucet 17, the hot water bathing is not performed by operating the heat pump, but only by hot water supply in the tank, hot water stored in the hot water storage tank 9 is mixed with hot water from the hot water mixing valve 14, and the bathtub 24 is used as appropriate temperature water. Hot water supply. The bath chasing is the same as that in the first embodiment, and a description thereof will be omitted.

  As in the first embodiment, the structure of the hot water storage tank 9 is 150L to 250L, and the heat pump refrigerant circuit unit and the hot water storage tank unit are integrated to reduce the size and weight, and the operation control means is a daytime heat pump operation. The time is reduced to 10% to 30% at night or on the previous day to save electricity costs.

  Next, the operation of the hot water storage type heat pump water heater of this embodiment will be described with reference to the flowchart of FIG.

  The difference from the first embodiment in the use of hot water and the subsequent operation control is that the operation conditions after the time table determination (step 64) are only hot water storage operation (step 65) and heat pump operation unnecessary (step 66), and direct hot water supply operation. There is no point. That is, in the case of a hot water storage type heat pump water heater, direct hot water supply is not performed. Therefore, as shown in FIG. 7, the time table has no direct hot water supply, either hot water storage operation or no operation at any time, and any time hot water storage operation. By changing the amount of stored hot water depending on the time zone, more appropriate efficient operation can be performed. For the forced night hot water storage operation, the level determination conditions and the tank boiling operation conditions in FIG. 4 are applied in the same manner as the direct hot water heat pump water heater described in the first embodiment.

  As described above, in the hot water storage type heat pump water heater, as in the case of the direct hot water supply type heat pump water heater, the tank boiling level is set and an appropriate nighttime forced hot water storage operation is performed. The operation can be performed, and more effective heat pump operation, optimization of the hot water storage temperature and the amount of stored hot water can achieve energy saving effects such as the effect of preventing hot water out of the day and the effect of suppressing the amount of heat released from the hot water storage tank.

  In addition, according to the present embodiment, in the hot water storage type heat pump water heater, as in the case of the direct hot water supply type, effects such as relaxation of installation restrictions, energy saving, elimination of hot water, optimization of hot water temperature and amount of hot water, and saving of electricity charges, etc. Can be obtained.

It is a schematic diagram which shows one Example of the heat pump refrigerant circuit of the direct hot water supply type heat pump water heater of this invention, a hot water supply circuit, an operation control means, and component structure. It is a flowchart which shows one Example of the hot water supply operation at the time of hot water use of the direct hot water supply type heat pump water heater of this invention, and subsequent operation control. An example of the time table which selects the daytime operation control by the time slot | zone of the direct hot water supply type heat pump water heater of this invention is shown. An example of the tank boiling level setting table | surface which determines the tank boiling condition at the time of forced nighttime hot water storage driving | operation of the direct hot water supply type heat pump water heater of this invention is shown. It is a schematic diagram which shows one Example of the heat pump refrigerant circuit of the hot water storage type heat pump water heater of this invention, a hot water supply circuit, an operation control means, and component structure. It is a flowchart which shows one Example of the hot water supply operation at the time of the hot water use of the hot water storage type heat pump water heater of this invention, and subsequent operation control. An example of the time table which selects the daytime operation control by the time slot | zone of the hot water storage type heat pump water heater of this invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Water refrigerant heat exchanger 3 Pressure reducing device 4 Air refrigerant heat exchanger 5 Water supply metal fitting 6 Pressure reducing valve 7 Water supply water amount sensor 9 Hot water tank 10 Tank circulation pump 12 Hot water mixing valve 13a Tank hot water valve 13b Tank hot water valve 14 Hot water mixing Valve 15 Flow rate adjustment valve 16 Kitchen outlet 17 Kitchen faucet 20 Bath circulation pump 24 Bath 26 Heat exchanger 30 for bath 30 Heat pump refrigerant circuit 40 Hot water supply circuit 50 Operation control means 51 Kitchen remote control 52 Bath remote control

Claims (6)

A compressor, a water-refrigerant heat exchanger that performs heat exchange between water and the refrigerant, a decompression device that depressurizes the refrigerant from the water-refrigerant heat exchanger, and an air-refrigerant heat exchanger that performs heat exchange between air and the refrigerant A heat pump refrigerant circuit connected to
A hot water storage circuit having the water refrigerant heat exchanger, a hot water storage tank for storing water heat-exchanged in the water refrigerant heat exchanger, and a circulation pump for circulating water in the hot water storage tank;
A tank hot water supply circuit for supplying hot water in the hot water storage tank from a hot water supply terminal;
In a heat pump water heater provided with operation control means for controlling the operation of the heat pump water heater,
The operation control means determines whether or not to operate the heat pump refrigerant circuit according to a hot water use mode and a time zone during hot water supply.   In claim 1,
  A direct hot water supply circuit for exchanging heat with the water refrigerant heat exchanger to supply hot water from a hot water supply terminal,
  The operation control means determines whether to perform tank hot water supply or direct hot water supply according to the amount of hot water stored during hot water supply.   In claim 1,
  The operation control means divides the amount of hot water stored during hot water supply into a plurality of stages, and determines whether or not the heat pump refrigerant circuit is operated according to the hot water usage mode even if the hot water storage amount is the same. Heat pump water heater.   In claim 1,
  The operation control means divides the hot water storage temperature of the hot water storage tank into a plurality of stages, and determines the boiling temperature according to the hot water storage temperature classification during night hot water storage operation.   In claim 1,
  The operation control means divides the amount of hot water stored in the hot water storage tank into a plurality of stages, and determines the amount of boiling in accordance with the classification of the amount of hot water stored during night hot water storage operation.   In claim 1,
  The operation control means divides the hot water storage temperature and hot water storage amount of the hot water storage tank into a plurality of stages, respectively, determines the boiling temperature according to the hot water storage temperature during night hot water storage operation, the same boiling amount and When the boiling temperature continues at least three times, the amount of boiling and the boiling temperature are changed based on the amount of hot water stored in the hot water storage tank and the hot water storage temperature.

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