JP5955249B2 - Heat pump system - Google Patents

Description

  The present invention relates to a heat pump system.

  Conventionally, a heat pump system including a heat pump device that is a heat pump type heat source device for supplying heat and an auxiliary heat source device (for example, a boiler, an electric heater, etc.) other than the heat pump type is known. For example, the conventional heat pump shown in the following Patent Document 1 compares the heating cost by the heat pump type heat source device and the heating cost by the auxiliary heat source device in order to reduce the running cost, and operates the heat source device advantageous in terms of cost. Is configured to do.

JP-A-01-208646

  However, in a heat pump system in which a determination cycle (priority heat source determination cycle) for determining a heat source device to be preferentially operated is constant, a cost curve indicating a temporal change in the heating cost of the heat pump device and the heating cost of the boiler over time A heat source device that should be preferentially operated can only be determined after a certain period of time has elapsed from the point where the cost curve showing the change intersects. Therefore, when the conventional technique shown in Patent Document 1 is applied to such a heat pump system, the operation of the heat source device, which is disadvantageous in terms of cost, is continued until a certain time has elapsed from the time when the two curves intersect. There was a problem that there was a possibility that it was not possible to meet the need for further energy saving.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the heat pump system which can aim at the further energy saving.

  In order to solve the above-described problems and achieve the object, the present invention provides a heat pump type first heat source device, a second heat source device other than the heat pump type, the first heat source device, and the second heat source device. A heat pump system that supplies a fluid heated by the first heat source device or the second heat source device, the control device having a constant period And calculating a first cost corresponding to the energy consumed by the first heat source device and a second cost corresponding to the energy consumed by the second heat source device, and the first cost. And the second cost is calculated over time, and the difference between the first cost fluctuation rate based on the plurality of first costs obtained during the period and the period is obtained between the periods. A second based on a plurality of said second costs The cost fluctuation rate difference at the same time point with respect to the strike fluctuation rate is calculated over time, and at the time of the cycle before the time point when the first cost and the second cost are the same, When the cost is higher than the second cost, the operation of the second heat source device is continued based on at least the cost difference and the cost fluctuation rate difference, or the first heat source device is used instead of the second heat source device. It is determined whether to operate, and the heat source device is controlled according to the determination result.

  According to this invention, the heating cost of the first heat source device that changes over time and the heating cost of the second heat source device that changes over time are advantageous in terms of cost at a timing before the time at which the heating cost becomes the same. Since the heat source device is predicted and controlled, there is an effect that further energy saving can be achieved.

FIG. 1 is a block diagram showing a configuration of a heat pump system according to an embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of the control device shown in FIG. FIG. 3 is a diagram illustrating a relationship of heating costs calculated by the heating cost difference calculation unit when the outside air temperature increases with time. FIG. 4 is a diagram illustrating a relationship of heating costs calculated by the heating cost difference calculation unit when the outside air temperature is decreasing with time. FIG. 5 is a flowchart showing a priority heat source determination procedure in the heat pump system according to the embodiment of the present invention.

  Embodiments of a heat pump system according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment.
FIG. 1 is a block diagram showing a configuration of a heat pump system according to an embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of the control device shown in FIG. FIG. 3 is a diagram illustrating a relationship of heating costs calculated by the heating cost difference calculation unit when the outside air temperature increases with time. FIG. 4 is a diagram illustrating a relationship of heating costs calculated by the heating cost difference calculation unit when the outside air temperature is decreasing with time. FIG. 5 is a flowchart showing a priority heat source determination procedure in the heat pump system according to the embodiment of the present invention.

  The heat pump system shown in FIG. 1 flows through a heat pump device 1, a boiler 2 that is an auxiliary heat source other than the heat pump type, a mixing tank 4 that stores hot water heated by the heat pump device 1 or the boiler 2, and a fluid pipe 7. A heat release device 3 that exchanges heat between hot water and hot water supply water (not shown) and a control device 100 that controls the heat pump system are provided. The heat pump device 1, the boiler 2, the heat radiator 3, and the mixing tank 4 are connected by a fluid pipe 7.

  An operation unit 101 is connected to the control device 100, and operation information 101 a (for example, a set temperature) set by the operation unit 101, outside air temperature information 6 a detected by the outside air temperature sensor 6, and hot water temperature sensor 5 The detected hot water temperature information 5a is input. The control device 100 generates various operation commands for the heat pump system based on these pieces of information, and controls the heat pump device 1, the boiler 2, and the like. In the illustrated example, the hot water temperature information 5a is acquired by the hot water temperature sensor 5 provided in the vicinity of the heat pump device 1, but the position of the hot water temperature sensor 5 is not limited to the location of the illustrated example. Any location of the fluid piping 7 may be used as long as the hot water heated by the heat pump device 1 and the boiler 2 can be detected.

  The heat pump device 1 draws heat from a low-temperature side heating fluid (air or the like) by a cycle consisting of evaporation, compression, condensation, and expansion steps, and heats the high-temperature side heated fluid (low-temperature water supplied from the fluid piping 7). Etc.), and heats the low-temperature water supplied from the fluid piping 7 based on the heat pump operation command (H / P operation command 41a) from the control device 100. The heated hot water is supplied to the mixing tank 4 and the like via the fluid pipe 7.

  The boiler 2 is an auxiliary heat source that burns fuel such as oil or gas and heats low-temperature water or the like supplied from the fluid pipe 7 by the combustion heat. Various known forms can be applied to the boiler 2. Yes, an electric heater or other heat device can be used instead of the boiler 2. The boiler 2 heats the low-temperature water supplied from the fluid piping 7 based on the boiler operation command 41 b from the control device 100. The heated hot water is supplied to the mixing tank 4 and the like via the fluid pipe 7.

  The temperature of the hot water heated by the heat pump device 1 or the boiler 2 is detected by the hot water temperature sensor 5 through the fluid pipe 7.

  FIG. 2 shows a detailed configuration of the control device 100. The control device 100 includes a heating cost determination unit 10, a heating cost fluctuation rate determination unit 30, a priority heat source determination unit 40, and a control unit 41 as main components.

  The heating cost determination unit 10 includes a heating cost difference calculation unit 11, a heating cost difference threshold storage unit 12, a cost difference calculation unit 13, a cost difference comparison unit 14, and a cost comparison unit 21.

  The heating cost difference calculation unit 11 includes an H / P cost calculation unit 15 and a boiler cost calculation unit 16.

  The H / P cost calculation unit 15 includes an electricity bill unit price storage unit 17, a tapping temperature data acquisition unit 19, and an outside air temperature data acquisition unit 20. The electricity bill unit price is stored in the electricity bill unit price storage unit 17 in advance, and the H / P cost calculation unit 15 stores, for example, the outside air temperature information 6 a taken into the tapping temperature data acquisition unit 19 and the outside air temperature data acquisition unit 20. The heating cost (heating cost H) of the heat pump device 1 is calculated based on the taken-out hot water temperature information 5 a and the electricity bill unit price recorded in the electricity bill unit price storage unit 17.

  The H / P cost calculation unit 15 calculates the heating cost H in an arbitrary period. This arbitrary period is a time obtained by dividing a priority heat source determination period T (see FIG. 3) for determining a heat source device to be operated with priority by an arbitrary number n (n is an integer of 2 or more). This is referred to as “calculation cycle”. For example, the cost calculation period when the priority heat source determination period T is 10 minutes and the arbitrary number n is 5 is 2 minutes, and the H / P cost calculation unit 15 calculates the heating cost H every 2 minutes.

  The boiler fee unit price storage unit 18 of the boiler cost calculation unit 16 records the boiler fee unit price in advance, and the boiler cost calculation unit 16 determines the heating cost (heating cost B) of the boiler 2 based on the boiler fee unit price. The calculation cycle of the heating cost B is a cost calculation cycle similarly to the H / P cost calculation unit 15.

  The heating cost H obtained by the H / P cost calculation unit 15 is input to the cost comparison unit 21, the cost difference calculation unit 13, and the H / P cost fluctuation rate calculation unit 35. Further, the heating cost B obtained by the boiler cost calculation unit 16 is input to the cost comparison unit 21, the cost difference calculation unit 13, and the boiler cost fluctuation rate calculation unit 36.

  The cost comparison unit 21 determines whether or not the heating cost H is greater than the heating cost B, and the comparison result is input to the priority heat source determination unit 40 as the cost comparison result 21a.

  The cost difference calculation unit 13 obtains a difference between the heating cost H and the heating cost B, and the difference is input to the cost difference comparison unit 14 as a cost difference 13a.

  A heating cost difference threshold 12a (first threshold) is recorded in the heating cost difference threshold storage unit 12 in advance, and the heating cost difference threshold 12a is used for calculation by the cost difference comparison unit 14.

  In the cost difference comparison part 14, it is judged whether the cost difference 13a is more than the heating cost difference threshold value 12a, and the comparison result is input to the priority heat source determination part 40 as the heating cost difference 11a.

  The heating cost variation rate determination unit 30 includes a heating cost variation rate difference calculation unit 31, a heating cost variation rate difference threshold storage unit 32, a cost variation rate difference calculation unit 33, and a cost variation rate comparison unit 34.

  The heating cost fluctuation rate difference calculation unit 31 includes an H / P cost fluctuation rate calculation unit 35 and a boiler cost fluctuation rate calculation unit 36.

  In the H / P cost storage unit 37 of the H / P cost variation rate calculation unit 35, a plurality of heating costs H calculated in the above-described cost calculation cycle are recorded. Then, the H / P cost fluctuation rate 35a is determined by these heating costs H. The H / P cost fluctuation rate 35a is obtained by, for example, an equation of H / P cost fluctuation rate = (heating cost Hn−heating cost H (n−1)) / heating cost Hn * 100 (where n is an integer of 2 or more). ).

  With this calculation, when the value of the H / P cost fluctuation rate 35a is negative, the heating cost H tends to decrease with time. Therefore, the H / P heating cost curve 102 shown in FIG. 4 shows a tendency to decrease with time as in the illustrated example. On the other hand, by this calculation, when the value of the H / P cost fluctuation rate 35a is positive, the heating cost H tends to increase with time. Therefore, the H / P heating cost curve 102 shown in FIG. 4 shows a tendency to increase with time as in the illustrated example.

  In the boiler cost storage unit 38 of the boiler cost fluctuation rate calculation unit 36, a plurality of heating costs B calculated in the above-described cost calculation cycle are recorded. Therefore, the boiler cost fluctuation rate calculation unit 36 sets these heating costs B. Thus, the boiler cost fluctuation rate 36a is obtained. The boiler cost fluctuation rate 36a is obtained by, for example, an expression of (heating cost Bn−heating cost B (n−1)) / heating cost Bn * 100 (where n is an integer of 2 or more).

  The H / P cost fluctuation rate 35a obtained by the H / P cost fluctuation rate calculation unit 35 and the boiler cost fluctuation rate 36a obtained by the boiler cost fluctuation rate calculation unit 36 are input to the cost fluctuation rate difference calculation unit 33. The cost variation rate difference calculation unit 33 obtains a difference (cost variation rate difference 33a) between the H / P cost variation rate 35a and the boiler cost variation rate 36a in the above-described priority heat source determination cycle T.

  In the heating cost fluctuation rate difference threshold storage unit 32, a heating cost fluctuation rate difference threshold 32a (second threshold) is recorded in advance.

  The cost fluctuation rate comparison unit 34 compares the cost fluctuation rate difference 33 a from the cost fluctuation rate difference calculation unit 33 with the heating cost fluctuation rate difference threshold 32 a read from the heating cost fluctuation rate difference threshold storage unit 32. Then, the determination result by the cost variation rate comparison unit 34 (whether the cost variation rate difference 33a is equal to or greater than the heating cost variation rate difference threshold 32a) is input to the priority heat source determination unit 40 as the heating cost variation rate difference 30a.

  The priority heat source determination unit 40 determines a heat source device to be preferentially operated based on the heating cost difference 11a from the cost difference comparison unit 14 and the heating cost variation rate difference 30a from the cost variation rate comparison unit 34. The determination result is output to the control unit 41. The control unit 41 generates and outputs an operation command (H / P operation command 41a or boiler operation command 41b) corresponding to the determination result of the priority heat source determination unit 40.

  Next, the relationship among the heating cost H, the heating cost B, the H / P cost variation rate 35a, and the boiler cost variation rate 36a will be described.

  FIG. 3 shows time-dependent changes in heating costs of the heat pump device 1 and the boiler in a time zone in which the outside air temperature rapidly rises (for example, a time zone from early morning to daytime), with time on the horizontal axis and cost on the vertical axis. A curve is shown.

  The H / P heating cost curve 102 indicated by a solid line in FIG. 3 is a curve showing the change over time of the heating cost of the heat pump apparatus 1, and the boiler heating cost curve 103 indicated by a dotted line is the time course of the heating cost of the boiler. It is a curve which shows a change.

  In the time zone in which the outside air temperature rapidly increases as in the illustrated example, the H / P cost fluctuation rate 35a obtained from the plurality of heating costs H is a negative value, and the boiler cost obtained from the plurality of heating costs B The value is larger than the fluctuation rate 36a. Therefore, the H / P heating cost curve 102 decreases to the right as in the illustrated example, and the heating cost of the heat pump device 1 tends to decrease over time.

  On the other hand, the heating cost of the boiler 2 is less changed over time than the heating cost of the heat pump device 1 in the time zone in which the outside air temperature rapidly increases. Therefore, the boiler heating cost curve 103 has a smaller variation rate than the H / P heating cost curve 102, and shows a tendency to be almost flat as in the illustrated example. In addition, although the boiler heating cost curve 103 of the example of illustration is made into the curve which is substantially flat for convenience of explanation, the change rate may become large depending on conditions.

  Thus, in the time zone when the outside air temperature rapidly increases, the H / P cost fluctuation rate 35a is a negative value and a value larger than the boiler cost fluctuation rate 36a. Accordingly, the two cost curves intersect at a certain time (time Ta) as shown in the example. Time Ta indicates a time point at which the heating cost H that changes over time and the heating cost B that changes over time are the same. In the illustrated example, the boiler heating cost curve 103 is lower than the H / P heating cost curve 102 in the time zone before the time Ta, and the H / P heating cost curve 102 is lower than the boiler heating cost curve 103 in the time zone after the time Ta. Is also low. Accordingly, it is more advantageous to operate the boiler 2 in the time zone before the time Ta which is the time of the cost change point, and the cost of the entire system is more advantageous in the time zone after the time Ta. Cost is advantageous. For this reason, if the boiler 2 is operated before the time Ta, and the heat source device to be controlled can be switched from the boiler 2 to the heat pump device 1 at the time Ta, the unnecessary cost of the entire system can be saved. Can do.

  However, in the heat pump system in which the above-described priority heat source determination cycle T is constant, the determination of the heat source device that should operate preferentially at the time Ta is not always performed. More specifically, before the time Ta when the two curves intersect, the heating cost H1 and the heating cost B1 are obtained at the time T1 according to the priority heat source determination period T, and the heating cost H2 and the heating are determined at time T2 according to the priority heat source determination period T. Cost B2 is required. As a result of performing the priority heat source determination based on these heating costs, the boiler operation command 41b is transmitted to the boiler 2 which is advantageous in terms of cost at the times T1 and T2. However, the heating cost H3 and the heating cost B3 are not obtained until the time T3 according to the priority heat source determination period T is reached. That is, since the priority heat source determination is not performed between time Ta and time T3, the operation of the boiler 2 that is disadvantageous in terms of cost is continued.

  In order to solve such a problem, in the heat pump system according to the present embodiment, for example, at the time T2 of the priority heat source determination period T immediately before the time Ta, the cost-effective boiler 2 is operating (time Even when the heating cost H is higher than the heating cost B at a time prior to Ta), when the following conditions are satisfied, the heat source device to be operated with priority at time T2 is switched from the boiler 2 to the heat pump device 1. It is configured.

The condition is when the following (1) and (2) are satisfied.
(1) The cost difference 13a at time T2 is equal to or less than the heating cost difference threshold 12a.
(2) The cost fluctuation rate difference 33a when the H / P cost fluctuation rate 35a at time T2 is negative is equal to or greater than the heating cost fluctuation rate difference threshold 32a.

  In addition, when the heat source device to be controlled is switched from the boiler 2 to the heat pump device 1 at time T2, the heating cost of the heat pump device 1 is disadvantageous between time T2 and time Ta, but from time T2 to time Ta. Since the time is shorter than the heat source selection period (time from time Ta to time T3) where the heating cost is not low, the cost of the entire system is reduced compared to when the boiler 2 is operated from time Ta to time T3. It can be expected to reduce.

  Further, when the time between time T2 and time Ta is longer than the illustrated example (that is, when the position of time T2 is closer to time T1 than the illustrated example), when the above two conditions are not satisfied at time T2. There is also. Even in that case, since the time from time Ta to time T3 is shortened, if it is determined that the heating cost H is smaller than the heating cost B at the time T3, the heat source to be controlled is the boiler 2 at time T3. To the heat pump device 1.

  In FIG. 4, the horizontal axis represents time and the vertical axis represents cost. For example, the time-dependent change in the heating cost of the heat pump device 1 and the boiler 2 in the time zone in which the outside air temperature rapidly decreases (for example, the time zone from evening to midnight). The curve shown is shown.

  In the time zone in which the outside air temperature rapidly increases as in the illustrated example, the H / P cost fluctuation rate 35a obtained from the plurality of heating costs H is a positive value, and the boiler cost obtained from the plurality of heating costs B The value is larger than the fluctuation rate 36a. Therefore, the H / P heating cost curve 102 rises to the right as in the illustrated example, and the heating cost of the heat pump apparatus 1 tends to increase with time.

  In this way, in the time zone in which the outside air temperature falls rapidly, the H / P cost fluctuation rate 35a is a positive value and a value larger than the boiler cost fluctuation rate 36a. Two cost curves intersect at a certain time Ta. In the example of FIG. 4, the boiler heating cost curve 103 is higher than the H / P heating cost curve 102 in the time zone before the time Ta, and the H / P heating cost curve 102 is the boiler heating cost curve 103 in the time zone after the time Ta. Higher than. Therefore, it is more advantageous to operate the heat pump apparatus 1 in the time zone before the time Ta, and the cost of the entire system is more advantageous to operate the boiler 2 in the time zone after the time Ta. For this reason, if the heat pump device 1 is operated before the time Ta, and the heat source device to be controlled can be switched from the heat pump device 1 to the boiler 2 at the time Ta, the cost of the entire system can be saved. be able to.

  Therefore, in the heat pump system according to the present embodiment, when the heat pump device 1 that is advantageous in terms of cost is operating at time T2 of the priority heat source determination period T before time Ta and immediately before time Ta (time) Even when the heating cost B is higher than the heating cost H at a time prior to Ta), the heat source device to be controlled is switched from the heat pump device 1 to the boiler 2 at time T2 when the following condition is satisfied. ing.

The condition is when the following (1) and (2) are satisfied.
(1) The cost difference 13a at time T2 is equal to or less than the heating cost difference threshold 12a.
(2) The cost fluctuation rate difference 33a when the H / P cost fluctuation rate 35a at time T2 is positive is equal to or greater than the heating cost fluctuation rate difference threshold 32a.

  Note that when the heat source device to be controlled is switched from the heat pump device 1 to the boiler 2 at time T2, the heating cost of the boiler 2 is disadvantageous between time T2 and time Ta, but the time from time T2 to time Ta Since the heating cost is shorter than the heat source selection period (time from time Ta to time T3) where the heating cost is not low, the cost of the entire system is reduced as compared with the case where the heat pump device 1 is operated from time Ta to time T3. It can be expected to reduce.

  Further, when the time between time T2 and time Ta is longer than the illustrated example (that is, when the position of time T2 is closer to time T1 than the illustrated example), when the above two conditions are not satisfied at time T2. There is also. Even in that case, the time from the time Ta to the time T3 is shortened. Therefore, if it is determined that the heating cost B is smaller than the heating cost H at the time T3, the heat source device to be controlled is the heat pump device at the time T3. 1 is switched to boiler 2.

  As described above, the heat pump system according to the present embodiment uses the above-described conditions, and the heat source device that is expected to be advantageous in the cost of the entire system immediately before reaching the time Ta at which the two cost curves intersect. Or immediately after reaching the time Ta at which the two cost curves intersect, the heat source apparatus having an advantageous cost for the entire system is selected.

  Hereinafter, the operation of the heat pump system according to the present embodiment will be described with reference to FIG.

  The heating cost difference calculation unit 11 calculates a heating cost B (boiler heating cost) by the boiler 2 and a heating cost H (H / P heating cost) by the heat pump device 1 at a preset cost calculation cycle (step S1). ).

  For example, the boiler heating cost and the H / P heating cost are calculated a plurality of times between times T1 and T2 of the priority heat source determination period T set in advance in the control device 100 (step S2, No), and each H / P heating is performed. The cost is stored in the H / P cost storage unit 37, and each boiler heating cost is stored in the boiler cost storage unit 38 (step S3).

  At the time (for example, T2) of the priority heat source determination cycle T (step S2, Yes), the heating cost variation rate determination unit 30 calculates the H / P cost variation rate 35a and the boiler cost variation rate 36a (step S4).

  Moreover, in the heating cost determination part 10, it is determined whether the H / P heating cost calculated by step S1 is larger than a boiler heating cost, and when H / P heating cost is larger than a boiler heating cost (step S5, Yes) The result is input to the priority heat source determination unit 40 as the cost comparison result 21a.

  Moreover, in the heating cost determination part 10, it is determined whether the cost difference 13a of the H / P heating cost calculated in step S1 and a boiler heating cost is below the heating cost difference threshold value 12a, and the determination result is a heating cost difference. 11a is input to the priority heat source determination unit 40.

  The heating cost fluctuation rate determination unit 30 determines whether the cost fluctuation rate difference 33a between the H / P cost fluctuation rate 35a and the boiler cost fluctuation rate 36a is equal to or greater than the heating cost fluctuation rate difference threshold 32a. The determination result is input to the priority heat source determination unit 40 as the heating cost fluctuation rate difference 30a.

  And in the priority heat source determination part 40, the following processes (priority heat source determination process) are performed based on the information from the heating cost determination part 10 and the video display apparatus 30.

  From the cost comparison result 21a, the H / P heating cost is larger than the boiler heating cost (step S5, Yes), the heating cost difference 11a is equal to or less than the heating cost difference threshold 12a (step S6, Yes), and the H / P The H / P cost fluctuation rate 35a from the cost fluctuation rate calculation unit 35 is a negative value (step S7, Yes), and the heating cost fluctuation rate difference 30a causes the cost fluctuation rate difference 33a to be equal to or higher than the heating cost fluctuation rate difference threshold 32a. (Yes in step S8), the priority heat source determination unit 40 determines that the heat source device to be prioritized is the heat pump device 1, and the control unit 41 generates the H / P operation command 41a according to the determination result. The As a result, the heat source device is switched from the boiler 2 to the heat pump device 1 (step S9).

  When the cost difference 13a is not less than or equal to the heating cost difference threshold 12a at step S6 (step S6, No), or when the H / P cost fluctuation rate 35a is not a negative value at step S7 (step S7, No), or step When the cost variation rate difference 33a is not equal to or greater than the heating cost variation rate difference threshold 32a in S8 (No in step S8), the priority heat source determination unit 40 determines that there is no need to switch the heat source device, and the control unit 41 determines this determination result. Accordingly, the boiler operation command 41b is continuously generated. As a result, the operation of the boiler 2 is continued (step S10).

  In step S5, the H / P heating cost is equal to or less than the boiler heating cost (step S5, No), the cost difference 13a is equal to or less than the heating cost difference threshold 12a (step S11, Yes), and the H / P cost fluctuation rate 35a is If it is a positive value (step S12, Yes) and the cost fluctuation rate difference 33a is equal to or greater than the heating cost fluctuation rate difference threshold 32a (step S13, Yes), the heat source device to be prioritized in the priority heat source determination unit 40 is the boiler 2. The controller 41 generates a boiler operation command 41b according to the determination result.

  If the cost difference 13a is not equal to or less than the heating cost difference threshold 12a in step S11 (step S11, No), or if the H / P cost variation rate 35a is not a positive value in step S12 (step S12, No), or step When the cost variation rate difference 33a is not equal to or greater than the heating cost variation rate difference threshold 32a in S13 (No in step S13), the priority heat source determination unit 40 determines that there is no need to switch the heat source device, and the control unit 41 determines this determination result. Accordingly, the H / P operation command 41a is continuously generated.

  As described above, the heat pump system according to the present embodiment includes the heat pump type first heat source device (1), the second heat source device (2) other than the heat pump type, the first heat source device, and the first heat source device. A heat pump system that supplies a fluid heated by the first heat source device or the second heat source device, and the control device 100 has a constant period ( During the priority heat source determination cycle T), the first cost (H) according to the energy consumed by the first heat source device and the second cost (B) according to the energy consumed by the second heat source device ) And a cost difference 13a at the same point in time over the first cost and the second cost, and the first cost based on the plurality of first costs obtained during the period Cost fluctuation rate (35a) and obtained during the period The cost variation rate difference 33a at the same point in time with the second cost variation rate (36a) based on the plurality of second costs is calculated, and the first cost and the second cost are the same. When the first cost is greater than the second cost at the time of the cycle before the time point (Ta) (for example, time T2), the second heat source is based on at least the cost difference 13a and the cost fluctuation rate difference 33a. It is determined whether to continue the operation of the heater or to operate the first heat source device instead of the second heat source device, and to control the heat source device according to the determination result. Thus, by considering not only the comparison result of the heating cost of each heat source device but also the comparison result of the heating cost fluctuation rate of each heat source device, the heating cost that changes over time in the time zone in which the outside air temperature is rising A heat source that is advantageous in terms of cost can be predicted after time Ta at a timing before time Ta when H and heating cost B that changes with time are the same. The heat source device can be controlled. As a result, the cost of the entire system can be reduced and further energy saving can be achieved.

  In addition, the control device 100 includes a cost comparison unit 21 that compares the heating cost H and the heating cost B, a cost difference calculation unit 13 that calculates a cost difference 13a, a cost difference 13a from the cost difference calculation unit 13, and a heating cost. The cost difference comparison unit 14 that compares the difference threshold value 12a, the cost variation rate difference calculation unit 33 that calculates the cost variation rate difference 33a, the cost variation rate difference 33a from the cost variation rate difference calculation unit 33, and the heating cost variation rate The heating cost H is larger than the heating cost B by the comparison result of the cost fluctuation rate comparison unit 34 and the cost comparison unit 21 for comparing the difference threshold 32a, and the cost difference 13a is the heating cost difference threshold by the comparison result of the cost difference comparison unit 14. 12a or less, the H / P cost fluctuation rate 35a is a negative value, and the cost is calculated according to the comparison result of the cost fluctuation rate comparison unit 34. If Doritsu difference 33a is heated cost volatility difference threshold value 32a above, the heat source unit to be prioritized is configured with the determined priority heat source determining unit 40 that the heat pump apparatus 1, the. Therefore, even when the boiler 2 is operating at a timing before the time Ta shown in FIG. 3, it is predicted that the heat source device that is advantageous in terms of cost after the time Ta is the heat pump device 1. The heat source device can be switched from the boiler 2 to the heat pump device 1.

  Further, in the heat pump system according to the present embodiment, when the first cost is smaller than the second cost at the time of the cycle before the time when the first cost and the second cost are the same, Based on at least the cost difference and the cost fluctuation rate difference, it is determined whether to continue the operation of the first heat source device or to operate the second heat source device instead of the first heat source device. It is comprised so that a heat source device may be controlled according to. Thus, by considering not only the comparison result of the heating cost of each heat source unit but also the comparison result of the heating cost fluctuation rate of each heat source unit, the heating that changes with time in the time zone in which the outside air temperature tends to decrease A heat source that is advantageous in terms of cost can be predicted after the time Ta at a timing before the time Ta at which the cost H and the heating cost B that changes with time are the same, and at a timing earlier than the time Ta. The heat source can be controlled. As a result, the cost of the entire system can be reduced and further energy saving can be achieved.

  In addition, the control device 100 includes a cost comparison unit 21 that compares the heating cost H and the heating cost B, a cost difference calculation unit 13 that calculates a cost difference 13a, a cost difference 13a from the cost difference calculation unit 13, and a heating cost. The cost difference comparison unit 14 that compares the difference threshold value 12a, the cost variation rate difference calculation unit 33 that calculates the cost variation rate difference 33a, the cost variation rate difference 33a from the cost variation rate difference calculation unit 33, and the heating cost variation rate The cost fluctuation rate comparison unit 34 for comparing the difference threshold 32a and the comparison result of the cost comparison unit 21 indicate that the heating cost H is smaller than the heating cost B, and the cost difference 13a is determined based on the comparison result of the cost difference comparison unit 14. 12a or less, the H / P cost fluctuation rate 35a is a positive value, and the cost is calculated based on the comparison result of the cost fluctuation rate comparison unit 34. If Doritsu difference 33a is heated cost volatility difference threshold value 32a above, the heat source unit to be prioritized is configured with the determined priority heat source determining unit 40 that the heat pump apparatus 1, the. Therefore, even when the boiler 2 is operating at a timing before the time Ta shown in FIG. 4, it is predicted that the heat source device advantageous in terms of cost after the time Ta is the boiler 2, and the heat source to be controlled The device can be switched from the heat pump device 1 to the boiler 2.

  Further, the embodiment of the present invention shows an example of the contents of the present invention, and can be combined with another known technique, and a part thereof is not deviated from the gist of the present invention. Of course, it is possible to change the configuration such as omission.

  As described above, the present invention is applicable to a heat pump system, and is particularly useful as an invention that can achieve further energy saving.

  DESCRIPTION OF SYMBOLS 1 Heat pump apparatus, 2 Boiler, 3 Heat release device, 4 Mixing tank, 5 Hot water temperature sensor, 5a Hot water temperature information, 6 Outside air temperature sensor, 6a Outside air temperature information, 7 Fluid piping, 10 Heating cost judgment part, 11 Heating cost difference Calculation unit, 11a heating cost difference, 12 heating cost difference threshold storage unit, 12a heating cost difference threshold value, 13 cost difference calculation unit, 13a cost difference, 14 cost difference comparison unit, 15 H / P cost calculation unit, 16 boiler cost calculation Unit, 17 electricity unit price storage unit, 18 boiler unit price storage unit, 19 hot water temperature data acquisition unit, 20 outside air temperature data acquisition unit, 21 cost comparison unit, 21a cost comparison result, 30 heating cost fluctuation rate determination unit, 30a heating Cost fluctuation rate difference, 31 Heating cost fluctuation rate difference calculation unit, 32 Heating cost fluctuation rate Difference threshold storage unit, 32a Heating cost fluctuation rate difference threshold, 33 Cost fluctuation rate difference calculation unit, 33a Cost fluctuation rate difference, 34 Cost fluctuation rate comparison unit, 35 H / P cost fluctuation rate calculation unit, 35a H / P cost fluctuation Rate, 36 boiler cost fluctuation rate calculation unit, 36a boiler cost fluctuation rate, 37 H / P cost storage unit, 38 boiler cost storage unit, 40 priority heat source determination unit, 41 control unit, 41a H / P operation command, 41b boiler operation Command, 100 control device, 101 operation unit, 101a operation information, 102 H / P heating cost curve, 103 boiler heating cost curve, B heating cost, H heating cost, T priority heat source determination cycle.

Claims (4)

A heat pump type first heat source device; a second heat source device other than the heat pump type; and a control device that performs operation control of the first heat source device and the second heat source device. Or a heat pump system for supplying fluid heated by the second heat source device,
The controller is
Calculating a first cost according to the energy consumed by the first heat source device and a second cost according to the energy consumed by the second heat source device during a certain period; Calculating a cost difference at the same time point of the first cost and the second cost,
Time course of a first cost variation rate based on the plurality of first costs obtained during the period and a second cost variation rate based on the plurality of second costs obtained during the period To calculate the cost fluctuation rate difference at the same time,
If the first cost is greater than the second cost at the time of the cycle before the time when the first cost and the second cost are the same, at least the cost difference and the cost fluctuation rate difference To determine whether to continue the operation of the second heat source device or to operate the first heat source device instead of the second heat source device,
A heat pump system that controls a heat source device according to the determination result. The controller is
A cost comparison unit for comparing the first cost and the second cost;
A cost difference calculation unit for calculating the cost difference;
A cost difference comparison unit that compares the cost difference from the cost difference calculation unit with a first threshold;
A cost fluctuation rate difference calculation unit for calculating the cost fluctuation rate difference;
A cost fluctuation rate comparison unit that compares the cost fluctuation rate difference from the cost fluctuation rate difference calculation unit with a second threshold value different from the first threshold value;
The first cost is greater than the second cost based on the comparison result of the cost comparison unit, the cost difference is equal to or less than the first threshold value based on the comparison result of the cost difference comparison unit, and the first cost fluctuation If the rate is a negative value and the cost variation rate difference is greater than or equal to the second threshold based on the comparison result of the cost variation rate comparison unit, it is determined that the heat source device to be prioritized is the first heat source device. A priority heat source determination unit to
The heat pump system according to claim 1, further comprising: A heat pump type first heat source device; a second heat source device other than the heat pump type; and a control device that performs operation control of the first heat source device and the second heat source device. Or a heat pump system for supplying fluid heated by the second heat source device,
The controller is
Calculating a first cost according to the energy consumed by the first heat source device and a second cost according to the energy consumed by the second heat source device during a certain period; Calculating a cost difference at the same time point of the first cost and the second cost,
Time course of a first cost variation rate based on the plurality of first costs obtained during the period and a second cost variation rate based on the plurality of second costs obtained during the period To calculate the cost fluctuation rate difference at the same time,
When the first cost is smaller than the second cost at the time of the cycle before the time when the first cost and the second cost are the same, at least the cost difference and the cost fluctuation rate difference To determine whether to continue the operation of the first heat source device or to operate the second heat source device instead of the first heat source device,
A heat pump system that controls a heat source device according to the determination result. The controller is
A cost comparison unit for comparing the first cost and the second cost;
A cost difference calculation unit for calculating the cost difference;
A cost difference comparison unit that compares the cost difference from the cost difference calculation unit with a first threshold;
A cost fluctuation rate difference calculation unit for calculating the cost fluctuation rate difference;
A cost fluctuation rate comparison unit that compares the cost fluctuation rate difference from the cost fluctuation rate difference calculation unit with a second threshold value different from the first threshold value;
The first cost is smaller than the second cost based on the comparison result of the cost comparison unit, the cost difference is equal to or less than the first threshold value based on the comparison result of the cost difference comparison unit, and the first cost fluctuation When the rate is a positive value and the cost variation rate difference is greater than or equal to the second threshold based on the comparison result of the cost variation rate comparison unit, it is determined that the heat source device to be prioritized is the second heat source device. A priority heat source determination unit to
The heat pump system according to claim 3, further comprising:

Images