JP6536387B2 - Hot water supply system - Google Patents

Description

  The present invention relates to a hot water supply system.

  As a hot water supply system, a heat pump type hot water supply system as described in Patent Document 1 below is known. In the conventional heat pump type hot water supply system, the target temperature is set so as to boil the heat required for the next day in the late night time zone where the electricity rate is low, and the water in the hot water storage tank is boiled by the heat source of the air heat source. The

JP, 2010-169294, A

  In the conventional general hot water supply system, the boiling operation is finished at the latest possible time of the late night time zone where the unit price of electricity is low, in order to suppress the heat radiation from the hot water stored in the hot water storage tank. As you adjust the boiling start time.

  In the hot water supply system described in Patent Document 1 and the conventional general hot water supply system, the system corresponds to two charge rates, ie, a daytime charge with a high electricity rate unit price and a midnight charge with a low electricity charge unit rate, The optimization of the heating control was to reduce the electricity bill charged.

  However, when the electricity charge system is diversified along with so-called liberalization of electricity, the conventional hot water supply system may not be able to say that the reduction effect of the electricity bill charged is not sufficient, and in some cases the electricity bill is expensive. It is possible to become

  This invention is made in view of such a subject, The objective is to provide the hot-water supply system which can reduce the electricity bill charged even if the electricity bill system diversifies. It is in.

In order to solve the above problems, a hot water supply system (3) according to the present invention includes a hot water storage tank (5) for storing hot water, a heat pump type heating device (4) for heating hot water stored in the hot water storage tank, and a heat pump type heating. And a control device (6) for controlling the device. The control device stores the operating efficiency of the heat pump type heating device stored in advance, the amount of heat required to boil the hot water stored in the hot water storage tank, and the electricity rate information charged for the power for driving the heat pump type heating device. Based on the amount of electricity consumed by the heat pump type heating device to heat the hot water stored in the hot water storage tank multiplied by the electricity rate unit price specified by the electricity rate information, the time and charge required for the boiling are charged. Then, the correlation of the electricity charges is calculated, and the operating conditions of the heat pump heating device are determined based on the calculation result. The control device acquires electricity bill information as information that changes corresponding to at least one conversion of time zone, day of the week, sunshine hours, and weather forecast.

  According to the present invention, since the correlation between the time required for boiling and the electricity bill to be charged is calculated by multiplying the amount of power consumption required to boil the hot water by the electricity bill unit price, the electricity bill Even if the unit price is subdivided for each time zone, the correlation can be derived by integrating the multiplication value of the power consumption and the electricity bill unit price in each time zone. Since the power consumption is calculated based on the operating efficiency and the required heat quantity, it is possible to cope with seasonal fluctuations and fluctuations in the amount of hot water used. Therefore, even when the electricity charge system is diversified, the electricity charge to be charged can be reduced.

  According to the present invention, it is possible to provide a hot water supply system capable of reducing the charged electricity bill even when the electricity bill system is diversified.

It is a figure which shows the structure of the hot-water supply system which is embodiment of this invention. It is a figure for demonstrating ECU shown by FIG. FIG. 5 is a flowchart for explaining the operation of the ECU shown in FIGS. 1 and 2; FIG. It is a figure for demonstrating an example of the electricity bill unit price. It is a figure for demonstrating an example of the relationship between heating capacity and efficiency. It is a figure for demonstrating an example of the electricity bill calculation charged. It is a figure for demonstrating an example of the relationship between boiling temperature and efficiency. It is a figure for demonstrating the electricity bill fluctuation at the time of changing boiling temperature. It is a figure for demonstrating the relationship between heating capacity and boiling time. It is a figure for demonstrating an example of the instruction | indication value of heating capability. It is a figure for demonstrating the relationship of the boiling temperature and efficiency in, when changing a refrigerant | coolant.

  Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. In order to facilitate understanding of the description, the same constituent elements in the drawings are denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  As shown in FIG. 1, the hot water supply system 3 includes a heat pump type heating device 4, a hot water storage tank 5, an ECU (Electronic Control Unit) 6, and a remote control 7. The ECU 6 is an embodiment of the control device in the present invention, and the remote control 7 is an embodiment of the input device in the present invention.

  The heat pump type heating device 4 includes a compressor 41, a water refrigerant heat exchanger 42, an expansion valve 43, an air heat exchanger 44, and a circulation pump 45. The refrigerant compressed by the compressor 41 to a high temperature and pressure is sent to the water refrigerant heat exchanger 42. In the water refrigerant heat exchanger 42, the high-temperature and high-pressure refrigerant and the hot and cold water in the hot water storage tank 5 exchange heat. The refrigerant that has passed through the water refrigerant heat exchanger 42 is sent to the expansion valve 43. The refrigerant is depressurized at the expansion valve 43 and becomes low temperature and low pressure. The refrigerant that has become low temperature and pressure in the expansion valve 43 is sent to the air heat exchanger 44. In the air heat exchanger 44, the refrigerant is evaporated and returned to the compressor 41. In the present embodiment, a carbon dioxide refrigerant is charged as the refrigerant, and is configured to be in a supercritical state on the high pressure side.

  The hot water storage tank 5 includes a tank body 51. Hot and cold water is stored in the tank main body 51, and by driving the circulation pump 45, hot and cold water is circulated between the water refrigerant heat exchanger 42 and the tank. As described above, since the high temperature and high pressure refrigerant is sent to the water refrigerant heat exchanger 42, the hot and cold water can be heated. Hot and cold water stored in the hot water storage tank 5 is supplied to the hot water supply target terminal.

  The ECU 6 is a device that controls the heat pump type heating device 4. The ECU 6 obtains temperature information from temperature sensors provided in each part, drives units of each part such as the compressor 41 and the circulation pump 45, and controls so that hot water of a predetermined temperature is stored in the hot water storage tank 5 at a predetermined time. ing.

  The remote control 7 is for inputting information for operating the hot water supply system 3. The remote controller 7 is configured to be able to input power ON / OFF, a set hot water temperature and the like. The remote controller 7 is also configured to be able to input electricity bill information. The information input to the remote control 7 is output to the ECU 6.

  As shown in FIG. 2, the ECU 6 receives information input from the remote controller 7, temperature information detected by various temperature sensors, efficiency information stored in advance, and the like. Specifically, the ECU 6 receives information such as a unit price of electricity for each time zone, a required heat amount calculated based on a hot water outlet temperature, a hot water outlet flow rate and a can body temperature, and a correspondence relationship between capacity and efficiency.

  Subsequently, the operation of the ECU 6 will be described with reference to FIG. In step S101, a unit price of electricity is acquired. In step S102 following step S101, the electricity bill unit price for each time zone is specified. An example of the electricity rate unit price is shown in FIG. As shown in FIG. 4, electricity unit price A from 23:00 to 9:00 the next morning, electricity unit price B from 9:00 to 16:00, and electricity unit price from 16:00 to 20:00 C, 20:00 to 23:00 The electricity unit price is B. Therefore, the time for which the electricity bill unit price A is applied is 10 hours, the time for which the electricity bill unit price B is applied is 10 hours, and the time for which the electricity bill unit price C is applied is 4 hours. In the present embodiment, it is assumed that the unit price A of electricity is the cheapest, and then the unit price B of electricity and the unit price C of electricity are higher in this order.

  Returning to FIG. 3, the description will be continued. In step S103, the outlet temperature, outlet flow rate, and can temperature are acquired. In step S104, the required heat amount is calculated based on the outlet temperature, the outlet flow rate, and the can temperature.

  In step S105, the efficiency with respect to the heating capacity is acquired. The efficiency is the energy consumption efficiency and the heating capacity per unit power consumption, and may be referred to as COP (Coefficient of Performance) in the present specification and in the drawings. FIG. 5 shows an example of the relationship between the heating capacity and the COP. The relationship between the heating capacity and the COP has a different profile depending on the water temperature and the outside air temperature. For example, if the outside air temperature is 10 ° C is L01, the outside air temperature is 30 ° C, such as L02. It becomes a relationship. The data of such a relationship is written as a map in the memory of the ECU 6. In the following description, the heating capacity is fixed at 1.0, and the COP is also 1.0, in order to simplify the contents and make them easy to understand.

  Returning to FIG. 3, the description will be continued. The processes in steps S101 and S102, the processes in steps S103 and S104, and the processes in step S105 may be performed in parallel in time series or may be processed in series in time series. If the process of step S106 is in time, for example, the specification of the electricity rate unit price may hold the processing result already executed unless the electricity rate unit price is updated.

In step S106, the relationship between the time required for boiling the required heat amount calculated in step S104 and the electricity bill to be charged is calculated. More specifically, it is calculated by the following equation.
Charged electricity rate = consumed energy × electricity rate unit price = ((heat required per hour / COP × electricity rate unit price) dt
= ((Required heat quantity / time / COP × electricity unit price) dt

  An example of the relationship between the time required for boiling of the required heat amount and the electricity bill to be charged, which is calculated in step S104, is shown as L03 in FIG. If the required heat quantity is boiled in 10 hours, it will be boiled only in the time zone to which the cheapest electricity bill unit price A is applied, and the electricity bill corresponding to the broken line shown by "A" in FIG. Boiling the required amount of heat in 20 hours results in boiling between the time zone in which the cheapest electricity bill unit price A is applied and the time zone in which the next lowest electricity bill unit price B is applied, as shown in "A + B" in FIG. The electricity charge corresponding to the broken line indicated by is charged. Boiling the required amount of heat in 24 hours, the time zone in which the cheapest electricity rate unit price A is applied, the time zone in which the next lowest electricity rate unit price B is applied, and the time zone in which the highest electricity rate unit price C is applied It will heat up by the electricity cost corresponding to the broken line shown by "A + B + C" of FIG. 6 will be charged. In the example shown in FIG. 6, since the electricity rate corresponding to the broken line indicated by “A” is the lowest, it is selected to be heated in 10 hours to which the electricity rate unit price A is applied.

  If the capacity of the hot water storage tank 5 is sufficient for the required amount of hot water, the boiling temperature can be lowered to raise the COP. As indicated by L04 in FIG. 7, the COP rises when the boiling temperature is lowered. Therefore, for example, as shown in L05 of FIG. 8, the electricity bill to be charged is generally lower than L03.

  Returning to FIG. 3, the description will be continued. In step S107 following step S106, a heating capacity instruction value is determined. The relationship between the time required for boiling the required heat amount and the heating capacity is as shown in FIG. The ECU 6 has maps such that L06, L07 and L08 are obtained for each required heat amount. In the case of this example, assuming that the map of L06 is used, the heating capacity is the required heat quantity / the time required for boiling, so the heating capacity X equivalent to 10 hours is determined as the indicated value.

  In step S108 following step S107, the boiling time is determined. As shown in FIG. 10, the heating is started at 23:00, and the heat pump heating device is operated with the heating capacity X so that the heating is completed at 9:00 the next morning.

  In the above-described embodiment, since the correlation between the time required for boiling and the electricity bill to be charged is calculated by multiplying the amount of power consumption required to boil the hot water by the unit price of electricity, Even if the charge unit price is subdivided for each time zone, the correlation can be derived by integrating the multiplication value of the power consumption and the electricity charge unit price in each time zone. Since the power consumption is calculated based on the operating efficiency and the required heat quantity, it is possible to cope with seasonal fluctuations and fluctuations in the amount of hot water used. Therefore, even when the electricity charge system is diversified, the electricity charge to be charged can be reduced.

  Further, in the present embodiment, when determining the operating conditions of the heat pump type heating device 4, the ECU 6 changes at least one of the heating capacity of the heat pump type heating device 4, the boiling temperature, and the boiling start time. It is decided. In the above example, the heating capacity is fixed to make the explanation easy to understand, but the heating capacity may be changed to determine the operating conditions. If the heating capacity is suppressed, the COP can be increased. The boiling temperature can be reduced by reducing the capacity of the hot water storage tank 5 if the capacity of the hot water storage tank 5 is sufficient. As the boiling start time, an appropriate time is set according to the level of the electricity charge unit price set for each time zone.

  Further, in the present embodiment, the ECU 6 supplies hot water by using the heating capacity, the boiling temperature, the outside air temperature of the place where the heat pump type heating device 4 is installed, and the hot water supplied from the hot water storage tank 5 It is stored in advance as information indicating a change corresponding to at least one change of the water supply temperature when used in the target terminal. By holding such a correspondence as a map, it is possible to set a COP according to the situation and accurately calculate the time necessary for boiling the necessary heat quantity.

  Further, in the present embodiment, the ECU 6 can determine the necessary amount of heat using the amount of hot water remaining in the hot water storage tank 5 and the learning result of the amount of hot water used. Based on the learning results of the amount of hot water used, it is not necessary to boil the full capacity of the tank, and the required amount of hot water can be grasped when the amount is smaller than the tank capacity. The electricity bill to be charged can be reduced.

  Further, in the present embodiment, the ECU 6 can acquire the electricity bill information as information that changes in response to at least one conversion of the time zone, the day of the week, the sunshine duration, and the weather forecast. Even if there is diversity in electricity rates, acquiring diversity information will enable operations that support diverse electricity rates.

  Further, in the present embodiment, the electricity charge information can be input to the remote control 7. As a response to the case where electricity rate information can not be obtained through the communication line, or to a simulation to consider changing the electricity rate plan, it is more convenient to configure the user to enter the electricity rate information to the remote control 7 Can be enhanced.

  Further, in the present embodiment, the refrigerant used in the heat pump type heating device 4 is carbon dioxide, or in the heat pump type heating device 4, it is a refrigerant whose high pressure becomes supercritical. As shown in FIG. 11, in the case of the carbon dioxide refrigerant, the relationship between the boiling temperature and the COP is as shown in L10, and in the case of the fluorocarbon refrigerant, it is as in L09. In the case of the carbon dioxide refrigerant, since the height range of the boiling temperature can be widely coped with, the effect of this embodiment capable of changing the boiling temperature can be further enhanced.

  In addition, this invention is not limited to above-described embodiment, In the range described in the claim, it can change suitably. Moreover, said each embodiment is not mutually irrelevant and can be combined suitably, unless the combination is clearly impossible. Further, in each of the above-described embodiments, elements constituting the embodiment are not necessarily essential unless clearly indicated as being particularly essential or unless it is considered to be obviously essential in principle. Further, in the above embodiments, when numerical values such as the number, numerical value, amount, range, etc. of constituent elements of the embodiment are mentioned, it is clearly indicated that they are particularly essential and clearly limited to a specific number in principle. It is not limited to the specific number except when it is done. In particular, when a plurality of values are exemplified for a certain amount, it is also possible to adopt a value between the plurality of values, unless otherwise noted and unless the principle is clearly impossible. . Further, in the above embodiments, when referring to the shape, positional relationship, etc. of the component etc., unless otherwise specified or in principle when limited to a specific shape, positional relationship, etc., the shape, etc. It is not limited to the positional relationship and the like.

3: Hot water supply system 4: Heat pump type heating device 5: Hot water storage tank 6: ECU
7: Remote control

Claims (2)

It is a hot water supply system (3),
With hot water storage tank (5) to store hot water,
A heat pump type heating device (4) for heating the hot water stored in the hot water storage tank;
A control device (6) for controlling the heat pump type heating device;
The controller is
Based on the operation efficiency of the heat pump type heating device stored in advance, the amount of heat necessary to boil the hot water stored in the hot water storage tank, and the electricity charge information charged for the power for driving the heat pump type heating device ,
The time and charge required for boiling are multiplied by multiplying the amount of power consumption required to boil the hot water stored in the hot water storage tank by the heat pump type heating device by the electricity rate unit price specified by the electricity rate information Calculate the correlation of electricity rates,
The operating condition of the heat pump type heating device is determined based on the calculation result, and
The hot-water supply system which acquires the said electricity bill information as information which changes corresponding to conversion of a time zone, a day of the week, sunshine hours, and a weather forecast .   The control device determines the operating condition by changing at least one of the heating capacity of the heat pump heating device, the boiling temperature, and the boiling start time in determining the operating condition of the heat pump heating device. The hot water supply system according to claim 1.

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