JP2005188820A - Hot water heater and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the control technology of a hot water floor heater capable of increasing a speed of temperature rise of the circulated water for heating, and shortening a setting time in starting the operation or in performing the change to rise a set temperature. <P>SOLUTION: This hot water heater comprises a transient target temperature setting means 34 for setting a refrigerant target temperature T<SB>rt</SB>and a hot water target temperature T<SB>wt</SB>to a temperature higher than a refrigerant target temperature T<SB>r0</SB>and a hot water set temperature T<SB>w0</SB>in stationary operation, when the operation is started or when the hot water set temperature T<SB>w0</SB>is switched by a temperature setting means 37, and when a circulated water temperature T<SB>w</SB>is lower than the hot water set temperature T<SB>w0</SB>, and a target temperature resetting means 35 for resetting the refrigerant target temperature T<SB>rt</SB>and the hot water target temperature T<SB>wt</SB>to the refrigerant target temperature T<SB>r0</SB>and the hot water set temperature T<SB>w0</SB>in stationary operation, when the circulated water temperature T<SB>w</SB>is over a value obtained by adding a specific raising value β to the hot water set temperature T<SB>w0</SB>in a stationary time. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a control technology for a hot water heating apparatus that heats circulating water using a heat pump and performs heating with the heated circulating water, and in particular, immediately after the start of the apparatus or immediately after a set temperature is changed. The present invention relates to a control technique in which rise time and settling time until circulating water reaches a desired temperature are short.

  As a control technique in a transient state at the time of starting or changing the set temperature of this type of hot water heating apparatus, one described in Patent Document 1 is known.

  The control technique described in Patent Document 1 is a technique for controlling a heat pump type hot water floor heater. In this case, the hot water floor heating apparatus heats the circulating water for floor heating by a heat pump cycle using a refrigerant. And floor heating is performed with the heated circulating water. The floor heating apparatus includes: a compressor that compresses refrigerant; a heat exchanger for floor heating that supplies heat of the refrigerant pressurized by the compressor to circulating water; a bed temperature detection unit that detects the bed temperature; and a set floor temperature; It consists of the structure provided with the operation control means which performs the operation control of a compressor according to the temperature difference with detection bed temperature.

When the operation control means increases the bed temperature detected by the bed temperature detection means toward the set bed temperature, the output (the number of revolutions) of the compressor until time t ₁ when the detected bed temperature reaches the set bed temperature. Is the maximum. Next, the maximum output state of the compressor is maintained until a certain set time t _m elapses after time t ₁ has elapsed. Then, after the set time t _m has elapsed, the control is switched to normal thermo-on / thermo-off control. The setting time t _m is determined according to the temperature difference [Delta] T _F set bed temperature Prefecture and detection bed temperature at a particular time after the start of operation. That is, when the temperature difference [Delta] T _F is large, a longer time setting t _m, when the temperature difference [Delta] T _F is small to shorten the set time t _m. Such control shortens the rise time until the floor surface temperature reaches the set temperature, and suppresses the floor surface temperature from excessively rising with respect to the set temperature.
JP 2000-28182 A

  In the conventional hot water heater, the output of the compressor is controlled by the detected bed temperature detected by the bed temperature detecting means. However, the circulating water that supplies heat to the floor heating device has a large heat capacity. Therefore, even when the rotation speed of the compressor is changed and the amount of heat supplied to the circulating water is reduced, the reaction until the bed temperature changes due to the influence is slow. That is, the control method of the conventional hot water floor heating apparatus is a control with a very long time constant in the floor temperature control. Therefore, there is a problem that it is difficult to control transient characteristics such as overshoot and undershoot of the bed temperature. The human sense of temperature is insensitive to slow changes in temperature, but sensitive to changes in temperature for a relatively short time. Therefore, accurate control of the floor temperature overshoot and undershoot is important for improving the comfort of the user of the hot water heater.

  Therefore, an object of the present invention is to quickly start up the circulating water temperature for heating at the start of operation of the hot water heating device or when the set temperature is increased, and to overshoot the circulating water temperature, The object of the present invention is to provide a control technology for a hot water floor heating apparatus with a small undershoot and a short settling time.

The first configuration of the hot water floor heating apparatus of the present invention includes an air refrigerant heat exchanger that performs heat exchange between outdoor air and refrigerant in the refrigerant circuit, and a compressor that pressurizes the refrigerant that has passed through the air refrigerant heat exchanger. A hot water refrigerant heat exchanger that heats the circulating water by heat exchange between the refrigerant pressurized by the compressor and the circulating water in the circulating water pipe, and the air that has been depressurized through the hot water refrigerant heat exchanger and the air refrigerant pressure reducing mechanism for sending the refrigerant heat exchanger, the circulating water temperature sensor for detecting the mounted on the back side or the outlet side of the hot water refrigerant heat exchanger circulating water temperature T _w, detecting the refrigerant temperature T _r of the compressor is discharged Refrigerant temperature sensor, temperature setting means for setting a hot water set temperature T _w0 that is a final temperature target value of the circulating water heated by the hot water refrigerant heat exchanger, the circulating water temperature T _w , This is the target temperature of the refrigerant discharged from the compressor. Based on the refrigerant target temperature _Trt and the hot water target temperature _Twt which is the target value of the temperature of the circulating water heated by the hot water refrigerant heat exchanger, the operation control of the compressor and the refrigerant pressure reducing mechanism is performed. In the hot water heating apparatus provided with a central control device and performing heating with the heated circulating water, the central control device switches the hot water set temperature _Tw0 when the operation is started or by the temperature setting means. when said circulating water temperature T _w is lower than the hot water set temperature T _w0, the coolant target temperature T _rt and the hot water target temperature T _wt, coolant target temperature T _r0 and hot water set at the time of steady operation even if the a transient target temperature setting means for setting a temperature higher than the temperature T _w0, when the circulating water temperature T _w exceeds the value obtained by adding a predetermined bulk upside β in hot water set temperature T _w0 in a steady state, the refrigerant target Characterized in that it includes a target temperature resetting means for resetting the temperature T _rt and the hot water target temperature T _wt the refrigerant target temperature T _r0 and hot water set temperature T _w0 during the steady operation.

Thus, when the circulating water temperature T _w immediately after switching of the hot water set temperature T _w0 is lower than the hot water set temperature T _w0, the refrigerant temperature T a _r and the circulating water temperature T _w, the refrigerant target temperature during steady operation T _r0 And the deviation of each temperature and target temperature becomes large by setting to temperature higher than warm water preset temperature _Tw0 . Thus, since the operation amount when the central control device controls the compressor and refrigerant pressure reducing mechanism is large, the rise time of the coolant temperature T _r and the circulating water temperature T _w is shortened. Therefore, early on it can be made closer to the hot water set temperature T _w0 the circulating water temperature T _w.

The target temperature resetting means, the circulating water temperature T _w is, when exceeding the value T _{w0 +} beta obtained by adding a predetermined bulk upside beta hot water set temperature T _w0, coolant target temperature T _rt and hot water target temperature T _{wt Are} reset to the refrigerant target temperature T _r0 during steady operation and the hot water set temperature T _w0 during steady operation. Here, the timing of resetting means switches the respective target temperature, T _w is not when reaching T _w0, by which the time has been reached T _{r0 +} beta, after switching the target temperature, circulating water _Undershoot that occurs at the temperature Tw can be suppressed.

That is, the circulation channel and each device through which the circulating water circulates usually have a certain large heat capacity. Thus, each target temperature circulating water temperature T _w is the switch when it reaches the hot water set temperature T _w0, next deviation 0 in the control of the circulating water temperature, the output of the compressor is reduced. Thereby, the heat supply amount from the refrigerant to the circulating water is reduced. However, because the heat capacity is large, the temperature of the circulating water channel and each device is not sufficiently increased, and the temperature of the circulating water is lowered and undershoot occurs. On the other hand, if to switch the target temperature when the circulating water temperature T _w exceeds T _{w0 +} beta, since the increase in the water circulation passage and the temperature of the devices come caught up, under-shoot of the circulating water temperature is suppressed .

  Here, as a control method when the central control device controls the compressor and the refrigerant pressure reducing mechanism, methods such as PID control and PI control are used.

  The value of the bulk value β may be constant. You may change according to the kind of heating panel attached to a circulation channel. You may change with warm water temperature at the time of change of warm water preset temperature. Moreover, you may change depending on external temperature or room temperature. The value of the bulkiness value β varies depending on the heat capacity of the circulation channel and various devices attached to the circulation channel. The

The second configuration of the hot-water floor heating device of the present invention, in the above-mentioned first configuration, the indoor temperature sensor for detecting the temperature (room temperature) T _i in the room where heating is performed, the outdoor air temperature (outdoor temperature) with an outdoor temperature sensor for detecting the T _o, the said central control unit calculates the difference temperature ΔT _io = _T i -T _o between the indoor temperature _{T i} and the outdoor temperature _{T o,} the difference temperature [Delta] T _An elevated value determining means for determining the elevated value β as a function of _io is provided.

Thus, by determining the bulk value β as a function of the difference temperature ΔT _io , the bulk value β can be adjusted according to the amount of heat necessary to heat the circulation channel and the equipment attached thereto. As a result, the undershoot that occurs after the circulating water temperature reaches the set temperature can be further reduced.

According to a third configuration of the hot water floor heating apparatus of the present invention, in the first or second configuration, the target temperature resetting unit is configured such that the hot water set temperature _Tw0 is changed and the compressor and the refrigerant pressure reducing mechanism are A predetermined time elapses after the operation control is started and before the refrigerant temperature T _r reaches a value obtained by adding a predetermined raised value β to the refrigerant target temperature T _r0 in a steady state, or the refrigerant temperature T _{r is} fixed. When the increase of the refrigerant temperature T _r stops before reaching the value obtained by adding the predetermined bulk value β to the normal refrigerant target temperature T _r0 , the refrigerant target temperature T _rt and the hot water target temperature T _wt are set at the time of the steady operation. It is forcibly reset to the refrigerant target temperature _Tr0 and the hot water set temperature _Tw0 .

  When the indoor heat capacity is very large compared to the output of the hot water heater (for example, when the room is very large relative to the heating capacity of the hot water heater, or the windows and doors of the room are open) In some cases, the circulating water temperature does not reach the hot water set temperature even when the hot water heater operates at the maximum output. In such a case, if the refrigerant target temperature and the circulating water target temperature are set to be higher than usual, the power consumption of the hot water heater becomes undesirably high.

Therefore, in such a case, the target temperature resetting unit is configured such that when a predetermined time elapses before the refrigerant temperature T _r reaches T _r0 + β after the operation control of the compressor and the refrigerant decompression mechanism is started, or the refrigerant temperature If the T _r has stopped rising of the refrigerant temperature T _r before reaching the value obtained by adding a predetermined bulk upside β to the refrigerant target temperature T _r0 of steady, heating load is determined to be excessive. Then, the refrigerant target temperature T _rt and the hot water target temperature T _wt are forcibly reset to the refrigerant target temperature T _r0 and the hot water set temperature T _w0 during steady operation. Thereby, useless consumption of electric power is suppressed.

A fourth configuration of the hot-water floor heating device of the present invention, in any one of the configurations of the first to third, the target temperature resetting means, the circulating water temperature T _w is heated set in the steady temperature T _w0 When the value obtained by adding a predetermined bulk value β to the refrigerant target temperature T _rt and the hot water target temperature T _wt is set to the refrigerant target temperature T _r0 and the hot water set temperature T _w0 during the steady operation for a predetermined time. It is characterized by resetting asymptotically in steps.

With this configuration, even when the target temperature resetting unit switches between the refrigerant target temperature _Trt and the hot water target temperature _Twt , the amount of change in each target temperature can be reduced. Therefore, since each target temperature is set to be rapidly small, it is possible to prevent the occurrence of a phenomenon that the operation of the compressor is stopped. That is, normally, the compressor is controlled by feedback control such as PID control based on the deviation between the refrigerant target temperature and the refrigerant temperature. When the refrigerant target temperature suddenly decreases and the deviation rapidly increases, the compressor May be controlled to stop. However, once the compressor is stopped, it cannot be started for a certain period of time to protect the compressor. Therefore, if the compressor stops, an undershoot with a large circulating water temperature occurs, which is not preferable from the viewpoint of comfort. Therefore, the refrigerant target temperature T _rt and the hot water target temperature T _wt are reset so as to gradually approach in steps so that the refrigerant target temperature T _r0 and the hot water set temperature T _w0 during steady operation are _reached in a predetermined time. Therefore, it is possible to avoid such a situation.

A first configuration of the method for controlling a hot water floor heating apparatus according to the present invention includes an air refrigerant heat exchanger that performs heat exchange between outdoor air and refrigerant in the refrigerant circuit, and refrigerant that has passed through the air refrigerant heat exchanger is added. A compressor that pressurizes, a hot water refrigerant heat exchanger that heats the circulating water by heat exchange between the refrigerant pressurized by the compressor and the circulating water in the circulating water pipe, and depressurizes the refrigerant that has passed through the hot water refrigerant heat exchanger. the refrigerant pressure reducing mechanism for sending the air-refrigerant heat exchanger, the circulating water temperature sensor for detecting the mounted on the back side or the outlet side of the hot water refrigerant heat exchanger circulating water temperature T _w, the refrigerant temperature T which the compressor is discharged Te Controlling a hot water heater having a refrigerant temperature sensor for detecting _r and a temperature setting means for setting a hot water set temperature _Tw0 that is a final temperature target value of circulating water heated by the hot water refrigerant heat exchanger A control method for starting operation, or Serial When the hot water set temperature T _w0 is the circulating water temperature T _w A when the switched by said temperature setting means is lower than the hot water set temperature T _w0, the refrigerant target temperature T _rt and the hot water target temperature T _wt Is set to a temperature higher than the refrigerant target temperature T _r0 and the warm water set temperature T _w0 during steady operation, and then the circulating water temperature T _w rises to the warm water set temperature T _w0 during steady operation. A second value for resetting the refrigerant target temperature T _rt and the hot water target temperature T _wt to the refrigerant target temperature T _r0 and the hot water set temperature T _w0 during the steady operation when a value obtained by adding a predetermined bulk value β is exceeded; It has the following steps.

The second configuration of the control method of the hot-water floor heating device of the present invention is the first configuration, the hot water heating system, an indoor temperature sensor for detecting the temperature (room temperature) T _i in the room where heating is performed , an outdoor temperature sensor for detecting the temperature (outdoor temperature) T _o of the outdoor air, has a, in the first step, the bulk upside β is between the indoor temperature T _i and the outdoor temperature T _o The temperature difference is determined by calculating a difference temperature ΔT _io = T _i −T _o and calculating a function of the difference temperature ΔT _io .

According to a third configuration of the control method of the hot water floor heating apparatus of the present invention, in the first or second configuration, after the first step, the refrigerant temperature _Tr is set to a predetermined refrigerant target temperature _Tr0 . When a predetermined time elapses before reaching the value obtained by adding the bulk value β, or before the refrigerant temperature T _r reaches the value obtained by adding the predetermined bulk value β to the steady-state refrigerant target temperature T _{r0. When} the rise of _r stops, the refrigerant target temperature T _rt and the hot water target temperature T _wt are forcibly reset to the refrigerant target temperature T _r0 and the hot water set temperature T _w0 during the steady operation. .

According to a fourth configuration of the method for controlling a hot water floor heating apparatus of the present invention, in any one of the first to third configurations, in the first step, the circulating water temperature _Tw is a hot water set temperature T at a normal time. _When the value obtained by adding a predetermined bulk value β to _w0 is exceeded, the refrigerant target temperature T _rt and the hot water target temperature T _wt are set to the refrigerant target temperature T _r0 and the hot water set temperature T during the steady operation for a predetermined time. It is characterized by resetting asymptotically in steps so as to become _w0 .

  As described above, according to the present invention, the rise time of the circulating water temperature can be shortened compared to the conventional case in a transient state immediately after the heating device is turned on or immediately after the set temperature of the heating is switched. it can. Further, undershoot that occurs after the circulating water temperature reaches the set temperature is suppressed. Thereby, the settling time until circulating water temperature converges to preset temperature can be shortened. As a result, since the heating temperature is set quickly and the temperature fluctuation is small, the comfort of the user of the hot water heater can be improved.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram illustrating a configuration of a hot water heater with an air conditioner according to a first embodiment of the present invention. In Example 1, as an example of the hot water heating apparatus 1, a hot water heating apparatus with an air conditioner having both functions of an air conditioner using a heat pump action of refrigerant and floor heating using hot water heat is shown.

  The hot water heater 1 includes an outdoor unit 2 installed outside, an indoor unit 3 installed near the ceiling of the wall surface of the air-conditioned room, and a floor heating device (floor heating panel) laid on the floor in the room 4 comprises three parts.

  A refrigerant pipe (refrigerant circulation path) 5 through which refrigerant circulates is provided between the outdoor unit 2 and the indoor unit 3. Connection valves 5c and 5d are provided at the entrance and exit of the refrigerant pipe 5 on the outdoor unit 2 side. Connection ports 5e and 5f are provided at the entrance and exit of the refrigerant pipe 5 on the indoor unit 3 side. The connection valve 5c and the connection port 5e, and the connection valve 5d and the connection port 5f are connected by a refrigerant pipe 5 made of a heat insulation pipe. By circulating the refrigerant through the refrigerant pipe 5, heat can be pumped from the outdoor unit 2 to the indoor unit 3 to heat the indoor air. Conversely, heat can be pumped from the indoor unit 3 to the outdoor unit 2 to cool the room. In the present invention, since the cooling function is not related, the cooling function is omitted in the following description.

  The refrigerant pipe 5 in the outdoor unit 2 includes a muffler 6, a strainer 7, an electronic expansion valve 8, a capillary tube 9, an air refrigerant heat exchanger 10, and a four-way valve 11 from the connection valve 5d side to the connection valve 5c side. The compressor 12, the four-way valve 11, and the hot water refrigerant heat exchanger 13 are connected in this order. An indoor heat exchanger 14 is connected to the refrigerant pipe 5 in the indoor unit 3.

  The air refrigerant heat exchanger 10 is provided with a propeller fan 15 to promote heat exchange between the outdoor air and the refrigerant. The propeller fan 15 blows outdoor air to the air refrigerant heat exchanger 10 to promote heat exchange. The indoor heat exchanger 14 is provided with a cross flow fan 19 for promoting heat exchange between the room air and the refrigerant and sending warm air into the room.

  On the other hand, a circulating water pipe 16 through which circulating water (hot water) circulates is provided between the outdoor unit 2 and the floor heating device 4. Connection valves 16a and 16b are provided at the entrance and exit of the circulating water pipe 16 on the outdoor unit 2 side. In the connection valves 16a and 16b, the circulating water pipe 16 on the floor heating device 4 side can be removed.

  The refrigerant pipe 5 is provided with a bypass pipe 5 ′ in parallel with the hot water refrigerant heat exchanger 13. The bypass pipe 5 ′ is provided with a check valve 20 that allows the refrigerant to pass only from the connection valve 5 c side to the four-way valve 11 side. The bypass pipe 5 ′ is a path through which the refrigerant passes during the cooling operation and is not directly related to the present invention, and thus the description thereof is omitted.

  The circulating water pipe 16 in the outdoor unit 2 is provided with a hot water refrigerant heat exchanger 13, a water supply tank 17, and a circulation pump 18 in this order from the connection valve 16a side. Circulating water in the circulating water pipe 16 is circulated by a circulation pump 18. The circulating water circulates in the order of the circulation pump 18 → the floor heating device 4 → the hot water refrigerant heat exchanger 13 → the feed water tank 17 → the circulation pump 18. The circulating water absorbs heat in the hot water refrigerant heat exchanger 13 and radiates heat in the floor heating device 4. Thereby, floor heating by warm water is performed.

  The discharge side pipe 5b that connects the compressor 12 and the four-way valve 11 is provided with a refrigerant temperature sensor 21 for detecting the temperature of the refrigerant. A circulating water temperature sensor 22 for detecting the temperature of the circulating water is provided in the vicinity of the outlet of the hot water refrigerant heat exchanger 13 on the connection valve 16a side. An outdoor temperature sensor 23 for detecting the temperature of outdoor air is provided inside the outdoor unit 2. An indoor temperature sensor 24 for detecting the temperature of room air is provided inside the indoor unit 3.

  In the outdoor unit 2, a central control device 25 for performing overall operation control of the hot water heating device 1 is provided. Inside the indoor unit 3, an indoor unit controller 26 that controls each device included in the indoor unit 3 is provided. The central controller 25 and the indoor unit controller 26 are connected by a control line 27 and can communicate data with each other.

  An indoor unit remote controller 28 is connected to the indoor unit controller 26 by a cable or wirelessly. The user can set the air conditioning temperature and the floor heating temperature using the indoor unit remote controller 28. Further, the floor heating device 4 is provided with a floor heating remote control 29. The floor heating remote controller 29 is connected to the central control device 25 by a cable or wirelessly. The user can set the floor heating temperature with the floor heating remote control 29.

  The central controller 25 cooperates with the indoor unit controller 26 to control the air conditioning temperature and floor heating temperature set by the indoor unit remote controller 28 or the floor heating remote controller 29, the refrigerant temperature sensor 21, the circulating water temperature sensor 22, the outdoor Based on the temperatures detected by the temperature sensor 23 and the indoor temperature sensor 24, operation control of the four-way valve 11, the compressor 12, the electronic expansion valve 8, the circulation pump 18, the propeller fan 15, and the cross flow fan 19 is performed. .

  Next, the heating operation in the hot water heater 1 will be briefly described. In the heating operation, the refrigerant in the refrigerant pipe 5 is heated by exchanging heat with outdoor air in the air refrigerant heat exchanger 10. The refrigerant heated by the air refrigerant heat exchanger 10 passes through the four-way valve 11 and is sent to the compressor 12 from the suction side pipe 5a. Here, the four-way valve 11 is a valve for switching the circulation direction of the refrigerant in the refrigerant pipe 5. At the time of heating, the air refrigerant heat exchanger 10 is connected to the suction side pipe 5 a of the compressor 12, and the hot water refrigerant heat exchanger 13 is connected to the discharge side pipe 5 b of the compressor 12. Conversely, during cooling, the air refrigerant heat exchanger 10 is connected to the discharge side pipe 5 b of the compressor 12, and the hot water refrigerant heat exchanger 13 is connected to the suction side pipe 5 a of the compressor 12.

  The refrigerant is compressed by the compressor 12, passes through the four-way valve 11, and is sent to the hot water refrigerant heat exchanger 13. In the hot water refrigerant heat exchanger 13, heat exchange between the refrigerant circulating in the refrigerant pipe 5 and the circulating water circulating in the circulating water pipe 16 is performed. Thereafter, the refrigerant is sent to the indoor heat exchanger 14 to radiate heat to the indoor air. Then, it passes through the muffler 6 and the strainer 7 and is sent to a refrigerant pressure reducing mechanism comprising an electronic expansion valve 8 and a capillary tube 9. The refrigerant depressurized by the refrigerant depressurization mechanism becomes lower in temperature than the outdoor air due to expansion. The cold refrigerant is sent to the air refrigerant heat exchanger 10 again and absorbs heat from the outdoor air. Heating by refrigerant circulation is performed by the heat pump cycle as described above.

  On the other hand, the circulating water heated in the hot water refrigerant heat exchanger 13 passes through the water supply tank 17 and the circulation pump 18 and is sent to the floor heating device 4. In the floor heating device 4, the circulating water dissipates heat and floor heating is performed. The circulating water cooled by heat radiation is sent again to the hot water refrigerant heat exchanger 13 to be heated. As described above, floor heating with hot water is performed.

  Next, functions related to the initial operation at the start of operation of the central controller 25 or when the set temperature is changed will be described. FIG. 2 is a functional block diagram relating to the transient control of the central controller and its peripheral devices. In FIG. 2, an electronic expansion valve 8, a compressor 12, a refrigerant temperature sensor 21, a circulating water temperature sensor 22, an outdoor temperature sensor 23, an indoor temperature sensor 24, a central controller 25, an indoor unit controller 26, an indoor unit remote controller 28, and The floor heating remote control 29 corresponds to that of the same number in FIG.

The central control device 25 includes an electronic expansion valve control unit 31, a compressor control unit 32, an elevated value determination unit 33, a transient target temperature setting unit 34, a target temperature resetting unit 35, an input / output interface 36, and a temperature setting unit 37. I have. The electronic expansion valve control unit 31 performs PID control on the opening degree of the electronic expansion valve 8 based on the deviation between the refrigerant target temperature set from the outside and the refrigerant temperature _Tr detected by the refrigerant temperature sensor 21. Compressor control unit 32, based on the deviation of the circulating water temperature T _w which circulating water temperature sensor 22 and the hot water target temperature is set from the outside is detected, performs the PID control of the rotation speed of the compressor 12.

The bulk upside determining means 33 calculates the difference temperature ΔT _io = _T i -T _o the outdoor temperature _{T o} of the indoor temperature _{T i} and the outdoor temperature sensor 23 that the indoor temperature sensor 24 detects detects this difference temperature [Delta] T _The bulk value β is determined and output as a function of _io . As a function for obtaining the bulk value β, a function that monotonously increases with respect to the value of the difference temperature ΔT _io is used. This is because the greater the difference temperature ΔT _io , the greater the amount of heat required to heat the circulating water pipe 16 and the devices attached thereto (floor heating device 4, water supply tank 17, etc.). As a function for determining the bulk value β, for example, a polynomial or step function of the difference temperature ΔT _io can be used.

In the present embodiment, the bulk value β is a function of the difference temperature ΔT _io , but the heat capacity of the circulating water pipe 16 and the equipment (floor heating device 4, water supply tank 17, etc.) attached thereto is not particularly problematic. The bulk value β may be a constant.

  The input / output interface 36 is an interface for performing communication with the indoor unit controller 26 in the central controller 25.

When the air conditioning temperature _Ta and the floor heating temperature _Tf set by the user are input from the indoor unit remote controller 28 or the floor heating remote controller 29, the temperature setting means 37 _{calculates the} hot water set temperature _Tw0 from these values. The refrigerant target temperature _Tr0 at the time of steady operation is obtained and output. Method for determining the air-conditioning temperature T _a and the floor heating temperature T _f hot water set temperature T _w0 and the refrigerant target temperature T _r0 of the steady operation from, for example, a method of referring to the temperature value table prepared in advance is used.

The transient target temperature setting means 34 receives the hot water set temperature _Tw0 and the refrigerant target temperature _Tr0 during steady operation from the temperature setting means 37. The circulating water temperature _Tw is input from the circulating water temperature sensor 22. Transient target temperature setting means 34, when you start the operation, or when the temperature setting means 37 hot water set temperature T _w0 circulating water temperature T _w in a case that has been switched is lower than the hot water set temperature T _w0, refrigerant The target temperature T _rt and the hot water target temperature T _wt are set to temperatures T _r0 + ΔT _r and T _w0 + ΔT _w that are higher than the refrigerant target temperature T _r0 and the hot water set temperature T _w0 during steady operation. Then, hot water target temperature _{T wt} of the compressor control unit 32 sets the _{T w0} + [Delta] T _w, to set the refrigerant target temperature _{T rt} of the electronic expansion valve control unit 31 to the _{T r0} + _{ΔT r.}

The target temperature resetting means 35 is input with the hot water set temperature _Tw0 and the refrigerant target temperature _Tr0 during steady operation from the temperature setting means 37. The circulating water temperature _Tw is input from the circulating water temperature sensor 22. Further, the bulk value β is input from the bulk value determining means 33. Target temperature resetting means 35, when the circulating water temperature T _w exceeds the value obtained by adding a predetermined bulk upside β in hot water set temperature T _w0 in a steady state, steady coolant target temperature T _rt and hot water target temperature T _wt The refrigerant target temperature _Tr0 and the hot water set temperature _Tw0 during operation are set. Then, hot water target temperature _{T wt} of the compressor control unit 32 is set to _{T w0,} it resets the refrigerant target temperature _{T rt} of the electronic expansion valve control unit 31 to the _{T r0.}

  In the hot water heating apparatus according to the first embodiment configured as described above, a control method at the start of operation or when the set temperature is changed will be described below.

  FIG. 3 is a flowchart showing the operation of the hot water heating apparatus 1 immediately after the start of the heating operation. The operation when changing the set temperature is the same as that immediately after the start of the heating operation.

First, when the heating operation is started, the temperature setting means 37 uses the air conditioning temperature _Ta and the floor heating temperature _Tf input from the indoor unit remote controller 28 or the floor heating remote controller 29, and the refrigerant target temperature T during steady operation. _Obtain and output _r0 and warm water set temperature _Tw0 . The bulk upside determining unit 33, based on the outdoor temperature T _o of the indoor temperature T _i and the outdoor temperature sensor 23 that the indoor temperature sensor 24 detects detects, determines the bulk upside beta (S1). Here, the hot water set temperature _Tw0 is higher than the floor heating temperature _Tf . Coolant target temperature T _r0 of steady-state operation is higher than the air-conditioning temperature T _a and the hot water set temperature T _w0.

Next, the transient target temperature setting means 34 determines the refrigerant target temperature T _rt as T _r0 + ΔT _r and determines the hot water target temperature T _wt as T _w0 + ΔT _w (S2). Then, the transient target temperature setting means 34 sets the hot water target temperature _Twt in the electronic expansion valve control unit 31, and sets the refrigerant target temperature _Trt in the compressor control unit 32 (S3).

Next, the compressor control unit 32 acquires the refrigerant temperature T _r [0] at time 0. The electronic expansion valve control unit 31 and the target temperature resetting means 35 acquire the circulating water temperature T _w [0] at time 0 (S4).

Next, the central controller 25 sets the value of the counter t representing the time to 1 and initializes it as T _r [1] = T _r [0], T _w [1] = T _w [0] ( S5).

Next, when circulating water temperature _Tw [t] is higher than circulating water target temperature _Tw0 (S6), the compressor control part 32 makes the compressor 12 an OFF state (S7), and transfers to step S15.

On the other hand, when the circulating water temperature T _w [t] is equal to or lower than the circulating water target temperature T _w0 (S6), the compressor control unit 32 turns on the compressor 12 (S8). And the compressor control part 32 determines and controls the rotation speed (omega) of the compressor 12 by deviation _Twt - _Tw [t] (S9). At this time, the electronic expansion valve control unit 31 determines and controls the opening degree θ of the electronic expansion valve 8 based on the deviation T _rt −T _r [t] (S10).

Next, the target temperature resetting means 35 determines whether T _w [t] is equal to or less than T _w0 + β (S11). When T _w [t]> T _w0 + β, the target temperature resetting unit 35 resets the refrigerant target temperature T _rt to T _r0 and resets the hot water target temperature T _wt to T _w0 . Further, the value of the counter t representing the time is reset to 0 (S14). Then, the process proceeds to step S15.

On the other hand, if T _w [t] ≦ T _w0 + β in step S11, the target temperature resetting means 35 determines whether T _w [t] is equal to or lower than T _w [t−1] (S12). If T _w [t] ≦ T _w [t−1], it is determined that the heating load is excessive, and the process proceeds to step S14.

On the other hand, in step _S12, if the _{T w [t]> T w} [t-1], the target temperature resetting means 35, the counter value t representing the time abort determines whether exceeds the time _{t max} (S13 ). Here, when t> t _max , it is determined that the heating load is excessive, and the process proceeds to step S14. On the other hand, if t ≦ t _max, the process proceeds to step S15.

When the above operation is completed, the central control device 25 increments the value of the counter t representing the time by 1 (S15). The compressor control unit 32 acquires the refrigerant temperature T _r [t] at time t. The electronic expansion valve control unit 31 and the target temperature resetting means 35 acquire the circulating water temperature T _w [t] at time 0 (S16). And it returns to operation | movement of step S6.

By the operation as described above, the circulating water temperature _Tw and the refrigerant temperature _Tr are controlled as shown in FIG. 4, for example. FIG. 4A shows a case where normal temperature control is performed with the target temperature fixed from the beginning, and FIG. 4B shows an example where the temperature control described in this embodiment is performed.

In the case of normal temperature control, when the operation of the compressor 12 is started, the refrigerant temperature _Tr rises and reaches the set value _Tr0 . On the other hand, the circulating water temperature _Tw gradually increases. In time t _2, the the circulating water temperature T _w approaches the set temperature, the rotational number of the compressor 12 omega gradually decreases. Circulating water temperature T _w at time t ₃ is stabilized at a set value, the rotation number of the compressor 12 omega reaches the final value. In this case, slow rise of the circulating water temperature T _w, settling a long constant-time t _3.

On the other hand, in the method of this embodiment, the initial refrigerant target temperature T _rt is set to be higher than T _r0 , so that there is a large deviation between the rising refrigerant temperature T _r and the refrigerant target temperature T _rt, and electronic expansion The opening degree θ of the valve 8 becomes narrower, and the differential pressure of the compressor 12 becomes larger. Therefore, fast rise of the refrigerant temperature _{T r,} the refrigerant temperature _{T r} within a short time _{t 1} 'than the time _{t 1} reaches the refrigerant target temperature _{T rt = T r0 + ΔT r} . Moreover, since it is set higher than the hot water set temperature T _w0 also steady state hot water target temperature T _wt, even faster rise of the hot water temperature T _w. At time _{t 2} ', the circulating water temperature _{T w} reaches a temperature _{T w0} + beta, hot water target temperature _{T wt} is re-set to the hot water set temperature _{T w0.} As a result, the hot water temperature _Tw falls and is set to the hot water set temperature _Tw0 at time t ₃ ′. At this time, if appropriately Sadamere values of bulk upside beta, under-shoot of the hot water temperature T _w is suppressed, the settling time t ₃ of the hot water temperature T _{w 'becomes} shorter.

It is a figure showing the structure of the hot water heating apparatus with an air-conditioner which concerns on Example 1 of this invention. It is a functional block diagram regarding the transient control of a central controller and its peripheral devices. It is a flowchart showing operation | movement of the hot water heating apparatus 1 immediately after heating operation start. It is a figure showing change of circulating water temperature _Tw and refrigerant temperature _Tr at the time of an operation start.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water heating apparatus 2 Outdoor unit 3 Indoor unit 4 Floor heating apparatus (floor heating panel)
5 Refrigerant pipe (refrigerant circuit)
5 'Bypass pipe 5a Suction side piping 5b Discharge side piping 5c, 5d Connection valve 5e, 5f Connection port 6 Muffler 7 Strainer 8 Electronic expansion valve (refrigerant decompression mechanism)
9 Capillary tube (refrigerant decompression mechanism)
DESCRIPTION OF SYMBOLS 10 Air refrigerant | coolant heat exchanger 11 Four-way valve 12 Compressor 13 Hot water refrigerant | coolant heat exchanger 14 Indoor heat exchanger 15 Propeller fan 16 Circulation water pipe 16a, 16b Connection valve 17 Water supply tank 18 Circulation pump 19 Crossflow fan 20 Check valve 21 Refrigerant Temperature sensor 22 Circulating water temperature sensor 23 Outdoor temperature sensor 24 Indoor temperature sensor 25 Central control device 26 Indoor unit controller 27 Control line 28 Indoor unit remote control 29 Remote control for floor heating 31 Electronic expansion valve control unit 32 Compressor control unit 33 Determination of bulkiness value Means 34 Transient target temperature setting means 35 Target temperature resetting means 36 Input / output interface 37 Temperature setting means

Claims (8)

An air refrigerant heat exchanger that exchanges heat between outdoor air and refrigerant in the refrigerant circulation path, a compressor that pressurizes the refrigerant that has passed through the air refrigerant heat exchanger, the refrigerant pressurized by the compressor and the circulation water pipe A hot water refrigerant heat exchanger that heats the circulating water by heat exchange with the circulating water, a refrigerant decompression mechanism that decompresses the refrigerant that has passed through the hot water refrigerant heat exchanger and sends the refrigerant to the air refrigerant heat exchanger, and the hot water refrigerant heat circulating water temperature sensor mounted on the back side or the outlet side of the exchanger for detecting the circulating water temperature T _w, the refrigerant temperature sensor for detecting the refrigerant temperature T _r of the compressor is discharged, it warmed in the hot water refrigerant heat exchanger Temperature setting means for setting a hot water set temperature _Tw0 which is a final temperature target value of the circulating water to be generated, and a refrigerant which is a target value of the circulating water temperature _Tw and the temperature of the refrigerant discharged from the compressor and the target temperature _{T rt,} the hot water-refrigerant heat Based on the hot water target temperature T _wt is a target value of the temperature of the warmed by circulating water at exchanger comprises a central control unit, for controlling the operation of said compressor the refrigerant pressure reducing mechanism, warmed In the hot water heating apparatus that performs heating with the circulating water,
The central controller is
When the operation is started, or when the hot water set temperature T _w0 is switched by the temperature setting means and the circulating water temperature T _w is lower than the hot water set temperature T _w0 , the refrigerant target temperature T _rt And a transient target temperature setting means for setting the hot water target temperature T _wt to a temperature higher than the refrigerant target temperature T _r0 and the hot water set temperature T _w0 during steady operation,
Wherein when the circulating water temperature T _w exceeds the value obtained by adding a predetermined bulk upside β in hot water set temperature T _w0 in a steady state, the refrigerant the refrigerant target temperature T _rt and the hot water target temperature T _wt during the steady operation and the target temperature resetting means for resetting the target temperature T _r0 and hot water set temperature T _w0,
A hot water heating apparatus comprising: Includes a room temperature sensor for detecting the room temperature (indoor temperature) T _i which heating is performed, the outdoor temperature sensor for detecting the temperature (outdoor temperature) T _o of the outdoor air, and
The central control unit calculates a difference temperature ΔT _io = T _i −T _o between the indoor temperature T _i and the outdoor temperature T _o , and determines the increase value β as a function of the difference temperature ΔT _io The hot water heater according to claim 1, further comprising a determining unit. The target temperature resetting means starts the operation control of the compressor and the refrigerant decompression mechanism after the hot water set temperature _Tw0 is changed, and then the refrigerant temperature _Tr is predetermined as the steady-state refrigerant target temperature _Tr0 . When a predetermined time elapses before reaching the value obtained by adding the bulk value β of the refrigerant, or before the refrigerant temperature _Tr reaches the value obtained by adding the predetermined bulk value β to the refrigerant target temperature T _r0 in the steady state When the increase in T _r stops, the refrigerant target temperature T _rt and the hot water target temperature T _wt are forcibly reset to the refrigerant target temperature T _r0 and the hot water set temperature T _w0 during the steady operation. The hot water heating apparatus according to claim 1 or 2. The target temperature resetting means, when the circulating water temperature T _w exceeds the value obtained by adding a predetermined bulk upside β in hot water set temperature T _w0 in a steady state, the refrigerant target temperature T _rt and the hot water target temperature T _{The wt} is reset so as to gradually approach in steps so that the refrigerant _reaches the refrigerant target temperature T _r0 and the hot water set temperature T _w0 during the steady operation at a predetermined time. A hot water heating apparatus according to claim 1. An air refrigerant heat exchanger that exchanges heat between outdoor air and refrigerant in the refrigerant circulation path, a compressor that pressurizes the refrigerant that has passed through the air refrigerant heat exchanger, the refrigerant pressurized by the compressor and the circulation water pipe A hot water refrigerant heat exchanger that heats the circulating water by heat exchange with the circulating water, a refrigerant decompression mechanism that decompresses the refrigerant that has passed through the hot water refrigerant heat exchanger and sends the refrigerant to the air refrigerant heat exchanger, and the hot water refrigerant heat circulating water temperature sensor mounted on the back side or the outlet side of the exchanger for detecting the circulating water temperature T _w, the refrigerant temperature sensor for detecting the refrigerant temperature T _r of the compressor is discharged, it warmed in the hot water refrigerant heat exchanger A control method for controlling a hot water heating apparatus comprising temperature setting means for setting a hot water set temperature _Tw0 that is a final temperature target value of the circulating water,
At the start of operation, or when said hot water set temperature T _w0 is said circulating water temperature A when the switched by the temperature setting means T _w is lower than the hot water set temperature T _w0, the refrigerant target temperature T _rt and the A first step of setting the hot water target temperature _Twt to a temperature higher than the refrigerant target temperature _Tr0 and the hot water set temperature _Tw0 during steady operation;
Thereafter, when the circulating water temperature _Tw rises and exceeds a value obtained by adding a predetermined raised value β to the warm water set temperature _Tw0 in a steady state, the refrigerant target temperature _Trt and the hot water target temperature _Twt are A control method for a hot water heater, comprising a second step of resetting to a refrigerant target temperature _Tr0 and a hot water set temperature _Tw0 during steady operation. The hot-water heating device is provided with an indoor temperature sensor for detecting the temperature (room temperature) T _i in the room where heating is performed, the outdoor temperature sensor for detecting the temperature (outdoor temperature) T _o of the outdoor air, and
In the first step, the bulk upside β calculates the difference temperature ΔT _io = _T i -T _o between the indoor temperature _{T i} and the outdoor temperature _{T o,} computes a function of the difference temperature [Delta] T _io The hot water heater control method according to claim 5, wherein the control method is determined by: After the first step, if the refrigerant temperature T _r has passed a predetermined time before reaching the value obtained by adding a predetermined bulk upside β to the refrigerant target temperature T _r0 in a steady state, or a refrigerant temperature T _r Gajo When the increase of the refrigerant temperature T _r stops before reaching the value obtained by adding the predetermined bulk value β to the normal refrigerant target temperature T _r0 , the refrigerant target temperature T _rt and the hot water target temperature T _wt are set at the time of the steady operation. The method of controlling a hot water heater according to claim 5 or 6, wherein the refrigerant is forcibly reset to the refrigerant target temperature _Tr0 and the hot water set temperature _Tw0 . In the first step, wherein when the circulating water temperature T _w exceeds the value obtained by adding a predetermined bulk upside β in hot water set temperature T _w0 in a steady state, the refrigerant target temperature T _rt and the hot water target temperature T _wt The resetting is performed so as to gradually approach in steps so that the refrigerant target temperature T _r0 and the hot water set temperature T _w0 during the steady operation are reached in a predetermined time. The control method of the hot water heating apparatus as described.

Images