JPH11337188A - Storage type hot water supply equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To boil up hot water in a hot water storage tank efficiently by selecting heat pump heat collecting operation or solar heat collecting operation exhibiting higher operational efficiency depending on the relationship between outer air temperature and hot water temperature. SOLUTION: A compressor, a condenser and an evaporator are coupled in series while encapsulating refrigerant to constitute a heat pump heat collector. A solar heat collector is coupled in parallel with the evaporator. A solenoid valve couples any one of the evaporator or the solar heat collector selectively with the compressor and the condenser. A controller determines heat pump heat collecting operation or solar heat collecting operation exhibiting higher operational efficiency depending on the relationship between outer air temperature detected through an evaporator temperature sensor and hot water temperature detected through a hot, water temperature sensor. A region H where the operational efficiency of heat pump heat collecting operation is high, a region S where the operational efficiency of solar heat collecting operation is high, and the border line A thereof are determined experimentally and stored in the memory means of the controller.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-water storage type hot water supply apparatus for efficiently raising and boiling water in a hot-water storage tank by selectively using a heat pump heat collecting operation and a solar heat collecting operation.

[0002]

2. Description of the Related Art Conventionally, as described in, for example, Japanese Patent Publication No. 19458/1992, the heat pump heat collection operation and the solar (solar heat) heat collection operation are selectively used in combination to raise water in a hot water storage tank. 2. Description of the Related Art There is known a hot water storage type hot water supply apparatus that performs hot boiling.

[0003] This hot water storage type hot water supply apparatus includes a heat pump heat collector having a compressor, a condenser and an evaporator, through which a refrigerant is circulated, and a solar heat collector connected in parallel to the evaporator. The condenser is configured to exchange heat with hot water in the hot water storage tank. By selectively switching one of the evaporator and the solar collector to the compressor and the condenser, the heat pump collector is connected. The water in the hot water storage tank is heated and boiled by one of the heat operation and the solar heat collection operation.

On a sunny day, for example, when a heat collection temperature detected by a heat collection temperature detection sensor provided in the solar heat collector is higher than a set temperature, a solar heat collection operation is performed,
The water in the hot water tank is heated and boiled using solar heat. Further, for example, on a cloudy day or a rainy day, when the heat collection temperature is lower than the set temperature, the heat pump heat collection operation is performed, and the temperature of the hot water in the hot water storage tank is raised using atmospheric heat.

[0005]

When the outside air temperature is high and the water temperature of the hot water tank is low, both the solar heat collecting operation and the heat pump heat collecting operation have an operation efficiency including a heat collection efficiency and a heat exchange efficiency. In particular, the solar heat collecting operation can raise the temperature of the hot water in the hot water tank efficiently at low running cost at low running cost, but when the outside air temperature is low and the hot water temperature in the hot water tank is high, the solar heat collecting operation and the heat pump In both the heat operation and the heat operation, the operation efficiency is reduced. In particular, the decrease in the operation efficiency in the solar heat collection operation has a larger characteristic than that in the heat pump heat collection operation.

[0006] In spite of the characteristics of the operating efficiency related to the outside air temperature and the hot and cold water temperature, the conventional hot water supply type hot water supply system does not consider the outside air temperature and the hot and cold water temperature, but collects the heat of the solar heat collector. Since the solar heat collecting operation and the heat pump heat collecting operation are automatically selected and executed on condition that the temperature is higher or lower than the set temperature, the conditions of the solar heat collecting operation are satisfied from the heat collecting temperature. Even if the outside air temperature is low or the water temperature is high, the operation efficiency of the heat pump heat collection operation may be good, or the outside air temperature may be high or the water temperature may be high even if the conditions of the solar heat collection operation are not satisfied from the heat collection temperature. If it is low, the operation efficiency of solar heat collection operation may be good,
Nevertheless, there is a disadvantage that the operation is not performed by the operation method with high operation efficiency, and the water in the hot water tank cannot be efficiently heated and boiled.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hot water supply type hot water supply device capable of efficiently raising and boiling water in a hot water storage tank.

[0008]

According to a first aspect of the present invention, there is provided a hot-water storage type hot water supply apparatus comprising a compressor, a condenser, and an evaporator, wherein a heat pump collector in which a refrigerant is circulated and a heat pump collector in parallel with the evaporator. A solar collector connected to the compressor, switching means for selectively switching one of the evaporator and the solar collector to the compressor and the condenser, and hot and cold water by heat exchange with the condenser. A hot water tank whose temperature rises and rises, an outside air temperature detecting means for detecting an outside air temperature, a hot water temperature detecting means for detecting a temperature of hot water in the hot water tank, and an outside air temperature detected by the outside air temperature detecting means. Operation control means for operating the heat pump heat collection operation and the solar heat collection operation in an operation mode with high operation efficiency in accordance with the relationship with the water temperature detected by the water temperature detection means. is there.

In accordance with the relationship between the outside air temperature and the temperature of the hot water in the hot water storage tank, the operation is performed in a heat pump heat collecting operation or a solar heat collecting operation with a more efficient operation method. If the operation efficiency of the heat pump heat collection operation is higher due to the high temperature, the heat pump heat collection operation is executed.Also, since the outside air temperature is high or the water temperature is low, the heat pump heat collection operation is When the operation efficiency is good, the solar heat collection operation is performed. This efficiently raises the temperature of the hot water in the hot water storage tank.

According to a second aspect of the present invention, in the hot water supply type hot water supply device of the first aspect, the outside air temperature detecting means is an evaporator temperature detection sensor provided in the evaporator.

An evaporator temperature detecting sensor provided in the evaporator detects an evaporator temperature for controlling defrosting of the evaporator, and no refrigerant flows to the evaporator when the operation is stopped or during the solar heat collecting operation. This detects the outside air temperature.

According to a third aspect of the present invention, there is provided a hot water supply type hot water supply apparatus comprising a compressor, a condenser, and an evaporator, and a heat pump heat collector in which a refrigerant is circulated, and a solar collector connected in parallel to the evaporator. A heat exchanger, switching means for selectively switching one of an evaporator and a solar collector to the compressor and the condenser, a hot water storage tank for storing hot water, and heat exchange with the condenser. A heat exchanger that raises and raises the temperature of the hot water in the hot water storage tank, hot water inlet temperature detection means for detecting the hot water inlet temperature from the hot water storage tank entering the heat exchanger, and an outlet temperature of the refrigerant exiting the condenser. And a heat pump heat collection operation in accordance with a relationship between the hot water inlet temperature detected by the hot water inlet temperature detecting means and the refrigerant outlet temperature detected by the refrigerant outlet temperature detecting means. And solar heat collection operation It is driven at a driving efficient operating mode of the out those that and a operation control means.

In accordance with the relationship between the inlet temperature of the hot water in the hot water tank entering the heat exchanger and the outlet temperature of the refrigerant exiting the condenser, a heat pump heat collecting operation or a solar heat collecting operation can be performed with a more efficient operation method. For example, during the solar heat collecting operation, if the outlet temperature of the refrigerant after the heat exchange is lower than the inlet temperature of the hot water entering the heat exchanger and the operation efficiency is deteriorated, the heat pump heat collecting operation is performed. I do. This efficiently raises the temperature of the hot water in the hot water storage tank.

According to a fourth aspect of the present invention, there is provided a hot water storage type hot water supply apparatus according to any one of the first to third aspects, wherein the operation control means includes a solar heat collection operation mode in which only the solar heat collection operation is performed. If the operation efficiency of the heat collecting operation is reduced, the solar heat collecting operation is stopped.

In the solar heat collecting operation mode in which only the solar heat collecting operation is performed, if the operation efficiency of the solar heat collecting operation is reduced, the solar heat collecting operation is stopped without continuing the operation while the operation efficiency is poor.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a first embodiment. FIG. 1 shows the operation efficiency of a solar heat collecting operation and a heat pump heat collecting operation according to the relationship between the outside air temperature and the hot and cold water temperature of a hot water supply type hot water supply apparatus. FIG. 2 is a configuration diagram of the hot water supply type hot water supply apparatus, and FIG. 3 is a time chart showing an operation state of each operation mode of the hot water supply type hot water supply apparatus.

In FIG. 2, reference numeral 11 denotes a hot water storage tank, which employs a hot water supply system of a first push-up type. A water supply pipe 12 connected to a water supply pipe is connected to a lower part of the hot water storage tank 11 and a hot water supply is provided at an upper part. A hot water supply pipe 13 connected to the pipeline is connected. The water supply pipe is connected to the water pipe via a water stop valve 14 and a strainer (not shown), and the hot water supply pipe is connected to a water stop valve 15.
Is connected to a hot water supply tap installed in, for example, a bathroom, a kitchen, and a washroom.

A drain pipe 17 having a drain valve 16 is connected to the lower part of the hot water storage tank 11, and a pressure relief valve (not shown) for releasing the expansion of water when boiling is connected to the hot water supply pipe 13.

A circulation pipe 18 is connected near the lower part of the hot water storage tank 11, and a circulation pump 19 for forcibly circulating the hot water in the hot water storage tank 11 is provided in the circulation pipe 18.

Reference numeral 21 denotes a heat pump collector, which is a compressor.
22, a condenser 23, an expansion valve 24, an evaporator (evaporator) 25, and a gas-liquid separator 26 are sequentially connected in series via pipes 27, 28, 29, and 30 to form a closed circuit. Is enclosed. The compressor 22 has a motor that can be controlled by an inverter. The condenser 23 is connected to the circulation pipe 18,
The circulation pipe 18 and the condenser 23 constitute a heat exchanger 31. The evaporator 25 has a blower fan 32 for sending outside air and a blower motor 33 for rotating the blower fan 32.

A solar collector 34 is connected in parallel with the evaporator 25 via pipes 35 and 36 connected to pipes 28 and 29, respectively. The solar collector 34 is installed in a place with good sunlight conditions, for example, on a roof.

The piping 28 and the piping 35 are provided with solenoid valves 37 and 38 as switching means for switching and connecting one of the evaporator 25 and the solar collector 34 to the compressor 22 and the condenser 23, respectively. It is arranged. That is, by opening the solenoid valve 37 and closing the solenoid valve 38, the refrigerant flows to the evaporator 25 and the heat pump heat collection operation is performed.
By closing 37 and opening the solenoid valve 38, the refrigerant flows to the solar heat collector 34 and the solar heat collecting operation is executed.

Further, on the outer wall of the trunk of hot water storage tank 11, hot water storage tank 11 is provided.
A plurality of hot water temperature detecting sensors 41 are provided as hot water temperature detecting means for detecting the hot water temperature and the remaining hot water amount in the hot water, and a hot water temperature detecting sensor 42 for detecting the hot water temperature guided into the hot water storage tank 11. Are arranged.

Further, the evaporator 25 is provided with an evaporator temperature detecting sensor 43 as an outside air temperature detecting means which is also used for detecting the temperature of the evaporator 25 and detecting the outside air temperature. The solar heat collector 34 is provided with a heat collecting temperature detection sensor 44 for detecting a heat collecting temperature.

Reference numeral 51 denotes a control device as operation control means. The control device 51 includes a plurality of hot and cold temperature detection sensors 4.
1, feedwater temperature detection sensor 42, evaporator temperature detection sensor 43,
A detection signal is input from the heat collection temperature detection sensor 44 and the like.
The control device 51 controls the drive of the circulation pump 19, the compressor 22, the blower motor 33, the solenoid valves 37 and 38, and the like.

The control unit 51 determines whether the heat pump heat collection operation or the solar heat collection operation is in accordance with the relationship between the outside air temperature detected by the evaporator temperature detection sensor 43 and the hot water temperature detected by the hot water temperature detection sensor 41. It has a function of operation control means for judging an operation method with high operation efficiency and operating the operation.
Further, the function of the operation control means has a function of stopping the solar heat collecting operation when it is determined that the operation efficiency of the solar heat collecting operation has decreased in the solar heat collecting operation mode in which only the solar heat collecting operation is performed. doing.

Then, the solar heat collecting operation will be described. The electromagnetic valve 37 is closed and the electromagnetic valve 38 is opened.
The compressor 22 is driven. As a result, the refrigerant flows through the compressor 22, the condenser 23, the solar collector 34, and the gas-liquid separator 26 in this order, as indicated by the solid arrows in FIG.

The refrigerant vaporized by the solar heat in the solar collector 34 is sent to the condenser 23 and liquefied, and the heat of the refrigerant is
The heat is given to the hot water in the circulation pipe 18 from the heat exchanger 23 and heat exchange is performed.

At this time, the circulation pump 19 is driven, and hot water (water) on the lower side of the hot water storage tank 11 is passed through the circulation pipe 18.
The hot water is forcibly circulated back to the inside of the hot water tank 11 again, and the entire amount of hot water in the hot water tank 11 is boiled while preventing the remaining hot water and the lower water in the hot water tank 11 from mixing.

In the heat pump heat collecting operation, the solenoid valve 37 is opened and the solenoid valve 38 is closed, and the compressor 22 and the blower fan 32 are driven. As a result, the compressor 22, the condenser,
The refrigerant flows in the order of 23, expansion valve 24, evaporator 25, and gas-liquid separator 26.

The refrigerant, which has undergone heat exchange with the outside air by the evaporator 25 and is vaporized, is compressed by the compressor 22 and liquefied by the condenser 23, and the heat of the refrigerant is transferred from the condenser 23 to the hot and cold water in the circulation pipe 18. Given and heat exchanged.

At this time, the circulation pump 19 is driven, and hot water (water) on the lower side of the hot water storage tank 11 is passed through the circulation pipe 18.
The hot water is forcibly circulated back to the inside of the hot water tank 11 again, and the entire amount of hot water in the hot water tank 11 is boiled while preventing the remaining hot water and the lower water in the hot water tank 11 from mixing.

Next, in FIG. 3, the control device 51 has, as operation modes, a standard operation mode, a solar heat collection operation mode, and a heat pump heat collection operation mode. An operation for raising the temperature is performed.

In the standard operation mode, if the water supply temperature detected by the water supply temperature detection sensor 42 of the hot water storage tank 11 is lower than the set value in the time period from 7:00 to 8:00, the hot water is surely supplied by evening. The heat pump heat collecting operation is performed in advance to secure the temperature, and the operation is not performed when the supply water temperature is higher than a set value. In the time zone from 8:00 to 12:00,
When the heat collection temperature detected by the heat collection temperature detection sensor 44 of the solar heat collector 34 is higher than a set value, the solar heat collection operation is performed, and when it is low, the heat pump heat collection operation is performed. In the time zone after 12:00, the heat pump heat collecting operation is performed until the temperature reaches the set temperature.

In the solar heat collecting operation mode, when the heat collecting temperature detected by the heat collecting temperature detecting sensor 44 of the solar heat collector 34 is higher than the set value in the time period from 7:00 to 17:00. The solar heat collecting operation is performed, and when the heat collecting temperature is lower than the set value, the solar heat collecting operation is stopped. 1
When the temperature reaches the set temperature by 7:00 or at 17:00, the solar heat collection operation is stopped.

In the heat pump heat collecting operation mode,
The heat pump operation is performed from 7:00 until the temperature reaches the set temperature.

Next, FIG. 1 shows a region H where the operation efficiency of the heat pump heat collection operation is high and a region S where the operation efficiency of the solar heat collection operation is high according to the relationship between the outside air temperature and the hot and cold water temperature. Boundary line A between region H and region S
Is shown. Boundary line A between these regions H and S
Are obtained by experiments and stored in the storage means of the control device 51.

For example, when the outside air temperature is 0.degree.
At 0 ° C. or lower, the operating efficiency of the solar heat collecting operation is higher at 20 ° C. or lower, and the operating efficiency of the heat pump heat collecting operation is higher at 20 ° C. or higher.

Similarly, at an outside air temperature of 40.degree.
When the temperature is 0 ° C or less, the operation efficiency of the solar heat collection operation is higher.
When the temperature exceeds 0 ° C., the operation efficiency of the heat pump heat collecting operation becomes higher.

In the solar heat collecting operation, the amount of heat collected in the solar heat collecting operation decreases with a decrease in the outside air temperature, and the amount of reduction is larger than that in the heat pump heat collecting operation. , The lower region S
Indicates that the solar heat collecting operation is high, and the upper region H has a high heat pump heat collecting operation.

Accordingly, in the standard operation mode, the controller 51 temporarily operates the solar heat collector 34 during the time period from 8:00 to 12:00 when the operation is selectively switched between the solar heat collecting operation and the heat pump heat collecting operation. Even if the heat collection temperature detected by the heat collection temperature detection sensor 44 is higher than the set value, for example, because the outside air temperature is low or the water temperature is high, the heat pump heat collection operation is performed based on the relationship between the outside air temperature and the water temperature. If it is determined that the temperature is in the region H where the operation efficiency is high, the heat pump heat collecting operation is performed, and conversely, if the heat collecting temperature detected by the heat collecting temperature detection sensor 44 of the solar heat collector 34 is lower than the set value. However, if the outside air temperature is high or the temperature of the hot and cold water is low, and if it is determined that the temperature is in the region S where the operation efficiency of the solar heat collecting operation is high from the relationship between the outside air temperature and the hot water temperature, the solar heat collecting operation is performed. Perform

As described above, since the operation method of the heat pump heat collection operation and the solar heat collection operation having the highest operation efficiency is determined according to the relationship between the outside air temperature and the hot water temperature of the hot water storage tank 11, the operation is performed. The water in the hot water storage tank 11 can be heated and boiled well.

In the solar heat collecting operation mode,
If the relationship between the outside air temperature and the hot and cold water temperature is in the region S where the solar heat collecting operation is efficient, the solar heat collecting operation is performed. If the relationship becomes the region H where the heat pump heat collecting operation is efficient, the solar heat collecting operation is stopped. I do. Therefore, during the solar heat collecting operation, if the relationship between the outside air temperature and the hot and cold water temperature deviates from the region S where the solar heat collecting operation has a high operating efficiency due to, for example, a decrease in the outside air temperature or an increase in the temperature of the hot and cold water, By stopping the thermal operation, it is possible to prevent the operation from continuing while the operation efficiency is poor, and to save energy.

Further, since the evaporator temperature detection sensor 43 provided in the evaporator 25 can be used as the outside air temperature detection means,
No special sensor is required and the configuration can be simplified.

In the standard operation mode, the time period for selectively switching between the solar heat collecting operation and the heat pump heat collecting operation is set to be long in summer when the outside air temperature is high and short in winter when the outside air temperature is low. By doing so, the solar heat collecting operation can be operated efficiently.

Next, FIGS. 4 and 5 show a second embodiment. FIG. 4 is a configuration diagram of a hot water supply type hot water supply apparatus. FIG. FIG. 5 is a characteristic diagram showing the operating efficiency of a solar heat collecting operation and a heat pump heat collecting operation according to the relationship with the outlet temperature of the solar cell. Note that the same configurations and operational effects as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the second embodiment, the temperature T1 of the hot water from the hot water storage tank 11 entering the heat exchanger 31 and the outlet temperature T2 of the refrigerant exiting the condenser 23 of the heat exchanger 31 depend on the relationship. In addition, an operation method with high operation efficiency among the heat pump heat collection operation and the solar heat collection operation is determined.

That is, a hot water inlet temperature detecting sensor 61 as hot water inlet temperature detecting means for detecting the hot water inlet temperature T1 from the hot water storage tank 11 entering the heat exchanger 31, and the heat exchanger 31
A refrigerant outlet temperature detection sensor 62 as a refrigerant outlet temperature detecting means for detecting an outlet temperature T2 of the refrigerant exiting the condenser 23 is connected to the controller 51 by the hot water inlet temperature detection sensor 61 and the refrigerant outlet temperature detection sensor 62. Have been.

The controller 51 includes a hot water inlet temperature detection sensor 61
In accordance with the relationship between the inlet / outlet temperature T1 of the hot water and the outlet temperature T2 of the refrigerant detected by the refrigerant outlet temperature detection sensor 62, the operation method of the heat pump heat collection operation and the solar heat collection operation with high operation efficiency It has a function of an operation control means for operating the vehicle by the operation.

In this case, the region H in which the operation efficiency of the heat pump heat collecting operation is good is the case where the relationship between the inlet temperature T1 of hot water and the outlet temperature T2 of the refrigerant in the heat exchanger 31 is T1> T2, The region S where the operation efficiency of the thermal operation is good is a case where the relationship between the inlet temperature T1 of the hot and cold water in the heat exchanger 31 and the outlet temperature T2 of the refrigerant satisfies T1 ≦ T2.

In the standard operation mode, during the time period (from 8 o'clock to 12 o'clock) in which the solar heat collecting operation and the heat pump heat collecting operation are selectively switched, the heat collecting temperature of the solar heat collector 34 is temporarily set. Even when the heat collection temperature detected by the detection sensor 44 is higher than the set value, for example, since the outside air temperature is low or the water temperature is high, the inlet temperature T1 of the hot water in the heat exchanger 31 and the outlet temperature T2 of the refrigerant are Is T1> T2
Is determined to be in the region H where the operation efficiency of the heat pump heat collection operation is good, and the heat pump heat collection operation is performed.
Conversely, even when the heat collection temperature detected by the heat collection temperature detection sensor 44 of the solar heat collector 34 is lower than the set value, for example, because the outside air temperature is high or the water temperature is low, the heat exchanger
When the relation between the inlet temperature T1 of the hot water and the outlet temperature T2 of the refrigerant at 31 satisfies T1 ≦ T2, it is determined that the solar heat collecting operation is in the region S where the operation efficiency is high, and the solar heat collecting operation is performed.

As described above, according to the relationship between the inlet temperature T1 of the hot and cold water entering the heat exchanger 31 and the outlet temperature T2 of the refrigerant exiting the condenser 23, the operating efficiency of the heat pump heat collecting operation and the solar heat collecting operation is determined. Since the operation is performed by judging a good operation method, the temperature of the hot water in the hot water storage tank 11 can be raised efficiently.

In the solar heat collecting operation mode,
Hot water inlet temperature T1 and refrigerant outlet temperature T2 in heat exchanger 31
If the relationship is within the region S where the operation efficiency of the solar heat collection operation is high, the solar heat collection operation is performed. If the relationship becomes the region H where the operation efficiency of the heat pump heat collection operation is high, the solar heat collection operation is stopped. For this reason, during the solar heat collecting operation, if the temperature falls outside the region S in which the solar heat collecting operation is efficient due to the relationship of T1> T2 due to, for example, a decrease in the outside air temperature or an increase in the temperature of hot and cold water, By stopping the operation, it is possible to prevent the operation from continuing with the operation efficiency being poor, and to save energy.

Next, FIGS. 6 and 7 show a third embodiment, FIG. 6 is a schematic flowchart of the operation of the hot water supply apparatus, and FIG. 7 is a detailed flowchart of the operation of the hot water supply apparatus. . Note that the same configuration, operation, and effect as those of the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

In the third embodiment, for example, an obstacle is determined by the orientation of the solar collector 34 installed eastward or westward corresponding to the orientation of the roof and the angle of sunlight in each season. The time period during which the solar heat collecting operation can be efficiently performed is automatically changed and set in accordance with the installation location of the solar heat collector 34 in the case where the sunlight is blocked.

That is, the controller 51 has a memory (not shown), and updates the heat collecting temperature detected by the heat collecting temperature detecting sensor 44 of the solar heat collector 34 for each week, for example, for one week. It has a function of storing and automatically changing and setting a time zone for executing the solar heat collecting operation based on the stored contents.

For example, as for the orientation of the solar collector 34, the solar collector 34 is installed facing east, and it is confirmed from the stored contents of the memory that the heat collecting temperature in the morning is high. Is set to change the time period for solar heat collection operation to be earlier, and if it is installed westward and it is confirmed from the memory contents that the heat collection temperature in the afternoon is high, the time period for solar heat collection operation Is set to be delayed, so that the solar heat collecting operation can be efficiently executed in accordance with the orientation of the installed state of the solar heat collector 34.

When the solar collector 34 is installed in a case where the sunlight is blocked by an obstacle depending on the angle of the sunlight in each season, the heat collecting temperature is low during the time when the sunlight is blocked by the obstacle. Therefore, if a time zone with low heat collection temperature is confirmed in a part of the solar heat collection operation time zone from the stored contents of the memory, the time zone is changed to be omitted in advance from the solar heat collection operation time zone By setting, the solar heat collecting operation can be efficiently executed according to the angle of sunlight and the presence or absence of an obstacle.

Then, in the flowchart of FIG.
The outline of the operation control of the hot water supply type hot water supply device by the control device 51 will be described. When the boiling start time comes, the feedwater temperature detection sensor 42
The season is determined based on the temperature of the water supplied to the hot water storage tank 11 detected in step (1). For example, if the temperature is 10 ° C. or less, winter;
If the temperature is 0 ° C or higher, it is determined that summer is reached.

The time t of the heat pump heat collection operation corresponding to each determined season is set (step 2).

The time s for the solar heat collecting operation is calculated and set based on the time until the completion of boiling and the time t for the heat pump heat collecting operation (step 3).

The time period during which the solar heat collecting operation is efficient is read from the contents stored in the memory, and the time period during which the solar heat collecting operation is performed is set (step 4).

In accordance with these settings, while automatically selecting the solar heat collecting operation or the heat pump heat collecting operation (step 5), the temperature of the hot water in the hot water storage tank 11 is raised to a predetermined temperature (step 6). .

The details of the operation control of the hot water supply type hot water supply device by the control device 51 will be described with reference to the flowchart of FIG. The boiling start time is 7:00 and the boiling completion time is 18
And the boiling time is x = 11 hours.

Hot water storage tank detected by water supply temperature detection sensor 42
Is the temperature of the water supplied to the inside of the chamber 11 below 10 ° C (Step 1
1) If it is 10 ° C or higher, is it 20 ° C or lower (Step 12)
Judge. This means that if the temperature is 10 ° C or less,
If the temperature is in the range of ２０20 ° C., it is determined to be spring or autumn;

If the water supply temperature is 10 ° C. or less in winter, the time t1 of the heat pump heat collecting operation is set to 10 hours (step 13). Based on the boiling time x and the time t1 of the heat pump heat collecting operation, the time s1 of the solar heat collecting operation is s1 =
It is set to 4 hours from the equation x-t1 + 3 (correction value) (step 14). The time period of the solar heat collecting operation time s1 is allocated according to the efficient time period of the solar heat collecting operation read out from the memory contents.
Set time (step 15).

Similarly, when the feedwater temperature is in the range of 10 ° C. to 20 ° C., the time t2 of the heat pump heat collecting operation is set to 9 hours (step 16). Based on the boiling time x and the time t2 of the heat pump heat collecting operation, the time s of the solar heat collecting operation is obtained.
2 is set to 5 hours from the equation s2 = x-t2 + 3 (correction value) (step 17). The time zone of the solar heat collecting operation time s2 is allocated in accordance with the efficient time zone of the solar heat collecting operation read out from the stored contents of the memory.
The time is set from 15:00 to 15:00 (step 18).

Similarly, when the supply water temperature is in the range of 20 ° C. or more, the time t3 of the heat pump heat collection operation is set to 8 hours (step 19). Based on the boiling time x and the time t3 of the heat pump heat collecting operation, the time s3 of the solar heat collecting operation is set to 6 hours from the formula of s3 = x-t3 + 3 (correction value) (step 20). The time period of the solar heat collecting operation time s3 is allocated in accordance with the efficient time period of the solar heat collecting operation read out from the stored contents of the memory, and is set, for example, from 9:00 to 15:00 (step 21).

In response to such a setting, until the start time of the solar heat collecting operation is reached (step 22), the water in the hot water storage tank 11 is heated and boiled by the heat pump heat collecting operation (step 23).

At the start time of the solar heat collecting operation, it is determined whether the heat collecting temperature detected by the heat collecting temperature detecting sensor 44 of the solar heat collector 34 is, for example, 50 ° C. or more (step 2).
Four).

For example, if the weather is good and the heat collecting temperature is 50 ° C. or more, the solar heat collecting operation is performed (step 25), the end time of the solar heat collecting operation is reached (step 26), or the weather is deteriorated. The solar heat collecting operation is continued until the heat collecting temperature becomes 50 ° C. or less.

For example, if the weather is bad and the heat collecting temperature is 50 ° C. or less, the heat pump heat collecting operation is performed (step 2).
7) Is it the end time of solar heat collection operation (Step 2)
8) Or the heat collection temperature is 50
The heat pump heat collection operation is continued until the temperature reaches ℃ or more.

When the end time of the heat pump heat collection operation is reached, the temperature of the hot water in the hot water storage tank 11 is raised to a predetermined temperature by the heat pump heat collection operation thereafter (step 29).

As described above, the heat collecting temperature detected by the heat collecting temperature detecting sensor 44 of the solar heat collector 34 is updated and stored in the memory of the control device 51 for each time period, for example, for one week, and the stored contents are stored. In order to automatically change and set the time zone for performing the solar heat collection operation based on, for example, the orientation of the installation state of the solar heat collector 34 installed eastward or westward, the angle of sunlight for each season The solar heat collecting operation can be efficiently executed in an efficient time period of the solar heat collecting operation according to the installation location of the solar heat collector 34 in a case where the sunlight is blocked by the obstacle.

Further, the length of the solar heat collecting operation time can be adjusted according to the change of the season, and the solar heat collecting operation can be efficiently executed.

By taking into account the outside air temperature and the hot and cold water temperature of the hot water storage tank 11, the time zone of the heat pump heat collection operation can be set in detail by the outside air temperature and the hot and cold water temperature of the hot water storage tank 11 on the operation day.
The solar heat collection operation can be made as long as possible.

Alternatively, the installation direction and the operation time zone of the solar heat collector 34 may be directly input, and the operation may be executed in a fixed operation pattern.

Next, FIG. 8 shows a fourth embodiment, and FIG. 8 is a configuration diagram of a hot water supply type hot water supply apparatus. Note that the same configuration, operation, and effect as those of the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

When two or more solar collectors 34 are used,
Conventionally, a non-return valve for a refrigerant and a heat collection temperature detection sensor 44 for detecting a heat collection temperature are provided to a solar heat collector 34 downstream of the refrigerant circuit.
Therefore, two types of solar collectors 34 are required on the upstream side and the downstream side of the refrigerant circuit, and in order to distinguish the two types of solar collectors 34 on the upstream side and the downstream side, The diameter of the piping of the refrigerant circuit entering the solar collector 34 is increased, and the diameter of the piping of the refrigerant circuit exiting from the solar collector 34 on the downstream side is reduced to prevent erroneous piping.

In the fourth embodiment, a plurality of solar heat collectors 34 are shared, and the solar heat collectors 34
The thicknesses of the pipes 35 and 36 connected to are also made common.

That is, a check valve 72 and a heat collection temperature detection sensor 73 are provided in a heat pump unit 71 having a heat pump heat collector 21. The check valve 72 is connected in the middle of the pipe 36 that exits the solar heat collector 34 and enters the compressor 22, and the heat collection temperature detection sensor 73 detects the temperature of the surface of the pipe 36.

When the weather is good, for example, the temperature of the surface of the pipe 36 detected by the heat collecting temperature detecting sensor 73 becomes zero.
° C or higher, so the efficiency of solar heat collection operation is high and the solar heat collection operation can be performed. Conversely, if the weather worsens,
Since the temperature is 0 ° C. or lower, the efficiency of the solar heat collecting operation is low, and the operation is switched to the heat pump heat collecting operation or the solar heat collecting operation is stopped.

As described above, by providing the check valve 72 and the heat collecting temperature detecting sensor 73 in the heat pump unit 71, the solar heat collector 34 can be shared by one type, and inventory management becomes easy, and There is no need to vary the thickness of 35 and 36, and only one type of piping 35 and 36 is required. Furthermore, the cable connected to the heat collection temperature detection sensor 73 can be shortened, and maintenance of the heat collection temperature detection sensor 73 can be performed without climbing on a roof or the like.

[0085]

According to the hot water storage type hot water supply device of the first aspect, the operation with high operation efficiency among the heat pump heat collection operation and the solar heat collection operation according to the relationship between the outside air temperature and the hot water temperature of the hot water storage tank. Since the operation is performed by the method, for example, when the operation efficiency of the heat pump heat collection operation is higher because the outside air temperature is low or the hot and cold water temperature is high, the heat pump heat collection operation is performed, and the outside air temperature is high. When the operation efficiency of the solar heat collection operation is higher because the water temperature is low, the solar heat collection operation is performed, so that the water in the hot water storage tank can be efficiently heated and boiled.

According to the hot water storage type hot water supply device of the second aspect,
In addition to the effect of the hot water storage type hot water supply device according to the first aspect, since the evaporator temperature detection sensor provided in the evaporator can also be used as the outside air temperature detection means, no special sensor is required and the configuration can be simplified.

According to the hot water storage type hot water supply device of the third aspect,
Depending on the relationship between the inlet temperature of the hot water in the hot water tank entering the heat exchanger and the outlet temperature of the refrigerant exiting the condenser, the operation can be performed in a heat pump heat collecting operation or a solar heat collecting operation with a more efficient operation method. For example, during the solar heat collecting operation, the outlet temperature of the refrigerant after the heat exchange does not become lower than the inlet temperature of the hot water in the heat exchanger, and the operation efficiency does not deteriorate. Can be heated to boiling.

According to the hot water storage type hot water supply device of the fourth aspect,
In addition to the effects of the hot water storage type hot water supply device according to any one of claims 1 to 3, in the solar heat collecting operation mode in which only the solar heat collecting operation is performed, if the operation efficiency of the solar heat collecting operation is reduced, the solar heat collecting operation is performed. Since the operation is stopped, it is possible to prevent the operation from being continued while the operation efficiency is poor.

[Brief description of the drawings]

FIG. 1 is a characteristic diagram showing the operating efficiency of a solar heat collecting operation and a heat pump heat collecting operation according to the relationship between the outside air temperature and the hot and cold water temperature of a hot water supply type hot water supply apparatus according to one embodiment of the present invention.

FIG. 2 is a configuration diagram of the hot water storage type hot water supply apparatus.

FIG. 3 is a time chart showing an operation state in each operation mode of the hot water storage type hot water supply apparatus.

FIG. 4 is a configuration diagram of a hot water supply type hot water supply apparatus according to a second embodiment of the present invention.

FIG. 5 is a characteristic diagram showing operating efficiency of a solar heat collecting operation and a heat pump heat collecting operation according to the relationship between the inlet temperature of the hot water and the outlet temperature of the refrigerant in the condenser of the hot water storage type hot water supply apparatus.

FIG. 6 is a flowchart illustrating an outline of operation control of a hot water supply type hot water supply device by a control device according to a third embodiment of the present invention.

FIG. 7 is a flowchart illustrating details of operation control of the hot water supply type hot water supply device by the control device.

FIG. 8 is a configuration diagram of a hot water supply type hot water supply apparatus according to a fourth embodiment of the present invention.

[Explanation of symbols]

11 Hot water storage tank 21 Heat pump collector 22 Compressor 23 Condenser 25 Evaporator 31 Heat exchanger 34 Solar collector 37, 38 Solenoid valve as switching means 41 Hot water temperature detection sensor as hot water temperature detecting means 43 Outside air temperature detection Evaporator temperature detection sensor as means 51 Control device having the function of operation control means 61 Hot water inlet temperature detection sensor as hot water inlet temperature detection means 62 Refrigerant outlet temperature detection sensor as refrigerant outlet temperature detection means

Claims (4)

[Claims] 1. A heat pump collector having a compressor, a condenser, and an evaporator, wherein a refrigerant is circulated; a solar collector connected in parallel to the evaporator; Switching means for selectively switching one of an evaporator and a solar collector to a condenser; a hot water storage tank in which hot water is heated and boiled by heat exchange with the condenser; and detecting an outside air temperature. An outside air temperature detecting means, a hot water temperature detecting means for detecting a temperature of hot water in the hot water storage tank, and a relation between an outside air temperature detected by the outside air temperature detecting means and a hot water temperature detected by the hot water temperature detecting means. Depending on,
A hot water supply type hot water supply device comprising: operation control means for operating the heat pump heat collection operation and the solar heat collection operation in an operation mode with high operation efficiency. 2. The hot water supply type hot water supply apparatus according to claim 1, wherein the outside air temperature detecting means is an evaporator temperature detecting sensor provided in the evaporator. 3. A heat pump collector having a compressor, a condenser, and an evaporator, in which a refrigerant is circulated; a solar collector connected in parallel to the evaporator; Switching means for selectively switching one of the evaporator and the solar heat collector to the heat exchanger; a hot water tank for storing hot water; and heat exchange between the condenser and the hot water in the hot water tank. A heat exchanger that boils, hot water inlet temperature detecting means for detecting hot water inlet temperature from a hot water tank entering the heat exchanger, and a refrigerant outlet temperature detecting means for detecting an outlet temperature of the refrigerant exiting the condenser. An operation of the heat pump heat collection operation and the solar heat collection operation according to the relationship between the hot water inlet temperature detected by the hot water inlet temperature detecting means and the refrigerant outlet temperature detected by the refrigerant outlet temperature detecting means. Efficient driving Hot water storage type water heater, characterized in that it comprises a driving control means for driving the formula. 4. The solar heat collecting operation mode in which only the solar heat collecting operation is performed, wherein the operation control means stops the solar heat collecting operation if the operation efficiency of the solar heat collecting operation is reduced. 4. The hot-water storage type hot-water supply device according to any one of 1 to 3.