JP2008275271A - Heat pump hot water supply floor heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve operation efficiency, by optimizing operation control for two kinds of uses of hot water supply and floor heating, in a heat pump hot water supply floor heating device of a two-cycle direct hot water supply system. <P>SOLUTION: This invention is the heat pump hot water supply floor heating device having a single system heat pump refrigerating circuit 41, a double system heat pump refrigerating circuit 42, a floor heating circuit 50, and an operation control means 55. The operation control means can perform optimal temperature control, by respectively setting a control quantity of a compressor rotating speed to the water outlet temperature of a hot water supply heat exchanger 3 in both a single system and a double system, setting a target value of the compressor rotating speed to a higher value among a hot water supply temperature target value and a floor heating forward temperature target value in the single system and to the hot water supply temperature target value in the double system, setting a control quantity of hot water supply expansion valve openings 4a and 4b to an evaporator overheating degree or the compressor delivery temperature in both the single system and the double system, and setting a control quantity of floor heating expansion valve opening to the floor heating forward temperature and a target value to the floor heating forward temperature target value, with the target value as a predetermined target value, when simultaneously operating the hot water supply and the floor heating. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat pump hot water supply floor heating apparatus, and more particularly to operation control when hot water supply and floor heating are performed simultaneously.

  In recent years, with the spread of heat pump water heaters, those having a floor heating function in addition to a hot water supply function have been proposed.

  As such a heat pump water heater, for example, high-temperature water (about 65 to 85 ° C.) heated by a hot water supply water heat exchanger by performing a heat pump operation for a long time (about 5 to 6 hours) every day at night is about 370 to 460 L. Water stored in a large hot water storage tank and mixed with the hot water every time it is used to make hot water at an appropriate temperature of about 40 ° C, and hot water for heating the floor while the water stored in the expansion tank is circulated by the pump There has been disclosed a heat pump hot water supply and heating device provided with a floor heating function of heating with a refrigerant heat exchanger and radiating heat with a floor heating panel (see Patent Document 1).

  On the other hand, in order to reduce the size and weight of the hot water storage tank, the heating capacity of the heat pump is greatly improved compared to the conventional hot water storage type, and the function of directly supplying hot water heated according to the operating temperature by operating the heat pump when using hot water is used. In addition, a heat pump hot water heater with a heating function is disclosed (see Patent Document 2).

  This heat pump water heater / heater uses the 1st heat pump cycle for floor heating and the 2nd heat pump cycle for hot water supply during simultaneous operation of hot water supply and heating, and the amount of hot water used increases, and the heating capacity of the 2nd heat pump cycle is insufficient. Sometimes, a part of the floor heating refrigerant is shifted to hot water supply, or the floor heating is temporarily stopped and the system 1 heat pump cycle is used for hot water supply.

JP-A-2005-274021 JP 2004-278876 A

  By the way, in the hot water storage type heat pump hot water supply and heating apparatus of Patent Document 1, since a large hot water storage tank is required, a heat pump unit and a tank unit are separately provided, and a large installation area and sufficient ground strength are required. Also, because it has only the ability to store hot water over a long period of time, if hot water storage operation and floor heating operation are performed at the same time, there is a risk of lowering the hot water storage capacity or lowering the floor heating temperature, and the amount of hot water used during the day is large. In such a case, the tank may run out.

  On the other hand, since the direct hot water supply type heat pump hot-water heater of Patent Document 2 includes two large-capacity heat pump devices, the possibility of a decrease in hot water storage capacity when hot water storage operation and floor heating operation are performed simultaneously is eliminated. Moreover, since the heat pump operation is performed at the time of use, the risk of running out of tank hot water is also eliminated.

  However, since the additional function of floor heating in the two-cycle direct hot water heat pump has been proposed since the date has been shallow, the characteristics of the two cycles have not been fully utilized, and thus more appropriate operation control is required. .

  It is an object of the present invention to improve operation efficiency by optimizing operation control for two types of uses of hot water supply and floor heating in a two-cycle direct hot water supply type heat pump hot water supply floor heating apparatus.

  The present invention relates to a direct hot water supply type, two-cycle, large capacity heat pump for the problem of running out of hot water in a hot water storage type heat pump hot water supply / heating device having a conventional floor heating function and a lack of heating capacity during simultaneous operation of hot water supply and floor heating. It can be solved by applying. Moreover, in such a heat pump hot-water hot water floor heating apparatus, as a result of examining the control of the rotational speed of the compressor and the expansion valve opening, the heat pump hot water hot water floor heating apparatus that has solved the conventional problems by performing the control according to the following configuration Is to provide.

  That is, the present invention includes a first compressor, a first hot water supply heat exchanger, a first hot water supply expansion valve, a first evaporator, a floor heating heat exchanger, and a floor heating expansion valve. The first hot water supply heat exchanger and the first hot water supply expansion valve include a 1-system heat pump refrigerant circuit connected in parallel with the floor heating heat exchanger and the floor heating expansion valve, a second compressor, A hot water heated by a second heat pump refrigerant circuit including a second hot water supply heat exchanger, a second hot water supply expansion valve, and a second evaporator, and the first and second hot water supply heat exchangers A hot water supply circuit for directly supplying hot water from a hot water fitting, a floor heating circuit for circulating hot water heated by a heat exchanger for floor heating, rotational speeds of the first and second compressors, and for the first and second hot water supply Operation control in a heat pump hot water floor heater having an operation control means for controlling the opening of an expansion valve and an expansion valve for floor heating When the hot water supply and floor heating are operated simultaneously, the stage sets the control amount of the compressor rotation speed to the water outlet temperature of the heat exchanger for hot water supply for both system 1 and system 2, and sets the target value for the compressor rotation speed to the hot water supply system 1 The higher of the temperature target value and the floor heating return temperature target value, the second system is the hot water supply temperature target value, and the control amount of the opening of the hot water expansion valve is the first system and the second system, the evaporator superheat or compressor discharge temperature The target value is a predetermined target value, the control amount of the floor heating expansion valve opening is the floor heating forward temperature, and the target value is the floor heating forward temperature target value.

  According to this, at the time of simultaneous operation of hot water supply and floor heating, the heat pump refrigerant circuit of the first system has the rotational speed of the first compressor, the opening degrees of the first hot water supply expansion valve and the floor heating expansion valve, 2 In the heat pump refrigerant circuit of the system, the rotation speed of the second compressor and the second hot water supply expansion valve are controlled based on a control table that defines a control amount and a target value, respectively. Can be simultaneously controlled to the respective target temperatures. Thereby, the optimal control of the 2-cycle system at the time of simultaneous operation of hot water supply and floor heating can be achieved, and the operation efficiency can be improved.

In this case, a temperature thermistor may be provided at each of the water-side heat transfer tube outlet of the first hot water supply heat exchanger and the water-side heat transfer tube outlet of the second hot water supply heat exchanger. In this way, the heat exchange water outlet temperature heated by the heat exchanger for hot water supply can be individually detected by the first and second systems, so that the water side heat transfer tube outlet temperature is set to the target value by the respective compressor rotation speeds. The hot water temperature can be stabilized, and the operation control means may be provided with a correction function for changing the floor heating forward temperature target value according to the use conditions. . According to this, for example, the floor heating forward temperature target value can be appropriately changed based on the change in the floor heating return temperature, so that the floor heating temperature can be stabilized.

  Further, the first and second hot water supply heat exchangers are integrated, and a heat exchange thermistor is provided at a position immediately after the water supply side heat transfer tubes of the first and second hot water supply heat exchangers merge. Also good. Thus, by integrating the heat exchanger for hot water supply, not only can the structure be simplified, but also the surface area of the heat exchanger can be reduced, so that heat dissipation loss can be reduced.

  The operation control means includes a first compressor, a first hot water supply heat exchanger, a first hot water supply expansion valve, a first evaporator, a floor heating heat exchanger, and a floor heating expansion. A 1-system heat pump refrigerant circuit comprising a valve, wherein the first hot water supply heat exchanger and the first hot water supply expansion valve are connected in parallel to the floor heating heat exchanger and the floor heating expansion valve; A second heat pump refrigerant circuit comprising a second compressor, a second hot water supply heat exchanger, a second hot water supply expansion valve, and a second evaporator; and first and second hot water supply heat exchangers A direct hot water supply circuit for directly supplying hot water heated by a hot water supply fitting, a floor heating circuit for circulating hot water heated by a heat exchanger for floor heating, first and second hot water heat exchangers, a hot water mixing valve, A hot water storage tank configured to store hot water heated by the first and second hot water supply heat exchangers, a hot water storage circuit including an in-machine circulation pump, A tank hot water supply circuit that mixes hot water heated by the first and second hot water supply heat exchangers and hot water stored in a hot water storage tank and supplies hot water from a hot water supply fitting; rotational speeds of the first and second compressors; The present invention can also be applied to a heat pump hot water supply floor heating apparatus that includes operation control means for controlling the opening degree of the first and second hot water supply expansion valves and the floor heating expansion valve.

  Thus, if the hot water storage tank has a function of storing hot water, for example, immediately after the start of the heat pump refrigerant circuit, when the heating capacity is not sufficient, the hot water of the hot water storage tank is mixed with the hot water of the direct hot water supply operation. Therefore, the hot water supply performance can be improved.

  According to the present invention, in a two-cycle direct hot water supply type heat pump hot water supply floor heating apparatus, it is possible to optimize operation control for two types of uses, hot water supply and floor heating, and to improve operation efficiency.

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

  In FIG. 1, the heat pump hot water supply floor heating apparatus includes a heat pump refrigerant circuit 40, a hot water supply circuit 45, a floor heating circuit 50, and an operation control means 55 including two cycles of a 1-system heat pump refrigerant circuit 41 and a 2-system heat pump refrigerant circuit 42. It is configured.

  The components of the heat pump refrigerant circuit 40, the hot water supply circuit 45, and the floor heating circuit 50 are integrally housed in the same box, and the operation control means 55 includes a hot water supply remote controller 55a and a floor heating remote controller 55b. . In addition, the kitchen faucet 14 which is a use terminal of the hot water supply circuit 45, the bathtub 23 provided with the bath circulation adapter 22, and the floor heating panels 33 and 34 are prepared separately from the heat pump hot water floor heater, and are used in the place where they are used. 6. It is used by being connected to the kitchen hot metal fitting 13, the hot and cold water fitting 21, the bath hot metal fitting 25, the floor heating hot water supply fittings 31, 32, and the floor heating return fitting 35, respectively.

  The heat pump refrigerant circuit 40 functions as a heating source for floor heating and hot water supply, and the 1-system heat pump refrigerant circuit 41 is disposed on the refrigerant side disposed in the compressor 1a, the refrigerant on-off valve 2a, and the hot water supply heat exchanger 3. The heat transfer pipe 3a, the hot water supply expansion valve 4a, and the evaporator 5a are sequentially connected by a refrigerant pipe, and the hot water supply closed cycle, and the floor disposed in the compressor 1a, the refrigerant on-off valve 2c, and the floor heating heat exchanger 27. The heating refrigerant pipe 27a, the floor heating expansion valve 4c, and the evaporator 5a are each configured by a closed floor heating cycle in which refrigerant pipes are sequentially connected, and a refrigerant is enclosed therein.

  Here, the compressor 1a and the evaporator 5a are used as common parts for a hot water supply closed cycle and a floor heating closed cycle, and are used for hot water supply by opening / closing the refrigerant on / off valves 2a and 2c and opening / closing the floor heating expansion valve 4c. Switching between a closed cycle and a closed cycle for floor heating is performed. The floor heating heat exchanger 27 and the floor heating expansion valve 4c are provided in parallel with the hot water supply heat exchanger 3 and the hot water supply expansion valve 4a.

  The system 2 heat pump refrigerant circuit 42 is configured such that the compressor 1b, the refrigerant on-off valve 2b, the refrigerant side heat transfer pipe 3b arranged in the hot water supply heat exchanger 3, the hot water supply expansion valve 4b, and the evaporator 5b are sequentially provided by refrigerant pipes. It consists of a connected hot water supply closed cycle, in which refrigerant is enclosed.

  The compressors 1a and 1b have a large capacity that can be adapted to a direct hot water heat pump water heater that directly supplies hot water heated by the hot water heat exchanger 3, and a rotational speed that can change the rotational speed according to the amount of hot water supplied. This is a controlled compressor. That is, the rotation speed of the compressors 1a and 1b is controlled from a low speed (eg, 700 rpm) to a high speed (eg, 7000 rpm) by PWM control, voltage control (eg, PAM control), and a combination control thereof. It has become.

  The hot water supply heat exchanger 3 includes refrigerant side heat transfer tubes 3a and 3b and water supply side heat transfer tubes 3c and 3d, and performs heat exchange between the refrigerant side heat transfer tubes 3a and 3b and the water supply side heat transfer tubes 3c and 3d. It is configured as follows.

  The expansion valves 4a, 4b, and 4c depressurize the medium-temperature and high-pressure refrigerant sent through the hot water supply heat exchanger 3 and the floor heating heat exchanger 27, and send them to the evaporators 5a and 5b as low-pressure refrigerant that easily evaporates. In the case of a heat pump hot water floor heater, the expansion valves 4a, 4b and 4c function to adjust the amount of refrigerant circulating in the heat pump circuit by changing the opening of the refrigerant passage in accordance with the heating capacity, and in the closed cycle for hot water supply An electric expansion valve having a variable squeezing amount and good responsiveness is suitable because it also serves as a defrosting device that fully opens the amount and sends a large amount of medium temperature refrigerant to the evaporators 5a and 5b to melt frost.

  The evaporators 5a and 5b are air refrigerant heat exchangers that take in outside air by rotating a fan (not shown) and exchange heat between the air and the refrigerant.

  Next, heat pump operation during hot water supply and floor heating operation will be described.

  In the hot water supply operation, the high-temperature and high-pressure refrigerant compressed by the compressors 1a and 1b flows into the refrigerant-side heat transfer tubes 3a and 3b of the hot-water supply heat exchanger 3 through the refrigerant on-off valves 2a and 2b. After the feed water flowing through 3c and 3d is heated and decompressed by the expansion valves 4a and 4b, the refrigerant that has become low-temperature and low-pressure gas by the evaporators 5a and 5b returns to the compressors 1a and 1b. By repeating this refrigerant circulation, the feed water can be continuously heated to supply hot water.

  In the hot water supply operation, the compressors 1a and 1b are operated by performing rotational speed control according to the hot water supply load such as the water supply temperature and the hot water supply temperature.

  The hot water heated in the hot water supply heat exchanger 3 joins from the water supply side heat transfer tubes 3c and 3d and is used after passing through the hot water mixing valve 10, the hot water mixing valve 11, the flow rate adjusting valve 12, and the kitchen tapping metal fitting 13. Hot water is supplied from the kitchen faucet 14 as a terminal.

  In the meantime, the hot water mixing valve 10 controls the opening of the mixing valve so that the detected temperature of the mixed water thermistor 10 s at the outlet becomes a target value, and the hot water mixed valve 11 is hot water mixed by the hot water mixing valve 10. When the temperature is higher, the water from the water supply fitting 6 is mixed to make the water warm to an appropriate temperature. Is to adjust.

  Next, in the floor heating operation, the 1-system heat pump refrigerant circuit 41 is operated, and the high-temperature and high-pressure refrigerant compressed by the compressor 1a flows into the floor heating refrigerant pipe 27a through the refrigerant on-off valve 2c and is used for floor heating. After the heat medium flowing through the heat transfer tube 27b is heated and decompressed by the expansion valve 4c, the refrigerant that has become low-temperature and low-pressure gas by the evaporator 5a returns to the compressor 1a. By repeating this refrigerant circulation, the floor heating heat medium is continuously heated.

  The heat medium heated in the floor heating heat exchanger 27 passes through the floor heating heat transfer pipe 27b, the branch pipe 28, the floor heating on-off valves 29 and 30, and the floor heating hot water supply fittings 31 and 32, and the floor heating panel. After the floor is heated by the heat radiation pipes 33a and 34a of 33 and 34, a heating medium circulation cycle of the floor heating return metal fitting 35, the floor heating tank 36, the floor heating circulation pump 37, and the floor heating heat exchanger 27 is formed. The floor heating circulation pump 37 is circulated to continuously heat the floor heating heat exchanger 27 and release the heat from the floor heating panels 33 and 34.

  The use of the floor heating panels 33 and 34 can be selected to use one each or use two at the same time by opening and closing the on-off valves 29 and 30 for floor heating.

  Next, the hot water supply circuit of the water system will be described.

  The hot water supply circuit includes a kitchen hot water supply circuit, a bath hot water supply circuit, a bath remedy circuit, and a hot water tank remedy circuit depending on applications.

  As hot water supply means, a direct hot water supply circuit for directly supplying hot water heated to the required temperature by the heat exchanger 3 for hot water supply by a heat pump operation, and low temperature water from the hot water in the hot water storage tank 15 stored in advance. There is a tank hot water supply circuit that mixes and supplies hot water at an appropriate temperature.

  The kitchen hot water supply circuit includes a water supply fitting 6, a pressure reducing valve 7, a water supply amount sensor 8, a water check valve 9, water supply side heat transfer tubes 3c and 3d, a hot water mixing valve 10, a hot water mixing valve 11, a flow rate adjusting valve 12, a kitchen hot water. The metal fittings 13 are sequentially connected via a water pipe. The water supply fitting 6 is connected to a water supply source such as a water supply, and the kitchen tap metal fitting 13 is connected to a kitchen faucet 14 or the like.

  The bath hot water supply circuit includes a water supply fitting 6, a pressure reducing valve 7, a water supply amount sensor 8, a water check valve 9, water supply side heat transfer tubes 3c and 3d, a hot water supply mixing valve 10, a hot water mixing valve 11, a flow rate adjustment valve 12, a bath note. A hot water valve 17, a flow switch 18, a bath circulation pump 19, a water level sensor 20, and a hot water inlet / outlet fitting 21 are sequentially connected through a water pipe.

  The bath memorial circuit has a structure in which an incoming / outgoing hot water fitting 21, a water level sensor 20, a bath circulation pump 19, a flow switch 18, a bath water pipe 24b of a bath heat exchanger 24, and a bath hot water fitting 25 are sequentially connected via a water pipe. Has been. The hot water fitting 21 is connected to the bathtub 23 via a bath circulation adapter 22, and hot water is supplied from the water level sensor 20 side to the bathtub 23 side during bath hot water supply, and from the bathtub 23 side to the water level sensor 20 side during bath replenishment. It is configured to circulate water.

  In addition, when bathing, the bath circulation pump 19 is operated to circulate the bath water using the bath chasing circuit, and the heat pump operation is performed using the heat pump refrigerant circuit 40. A hot water circulation cycle of the heat pipes 3c and 3d, the bath heat exchanger on / off valve 26, the bath refrigerant pipe 24a and the in-machine circulation pump 16 is formed, and the hot water heated by the hot water supply heat exchanger 3 is generated by the operation of the in-machine circulation pump 16 The remaining hot water in the bathtub 23 circulating in the bath water pipe 24b is heated by the bath heat exchanger 24 and returned to the bathtub 23 for bath renewal.

  The hot water storage tank memorial circuit is configured by sequentially connecting a hot water storage tank 15, an in-machine circulation pump 16, water supply side heat transfer tubes 3c and 3d of the hot water supply heat exchanger 3, and a hot water supply mixing valve 10 via a water pipe.

  In the reheating operation of the hot water storage tank, the lower low temperature water of the hot water storage tank 15 is sent to the water supply side heat transfer pipes 3c and 3d by the operation of the in-machine circulation pump 16 and heated to become high temperature water. Hot water is stored on the upper side. By repeating this circulation heating, the hot water gradually becomes hot water from the upper side of the hot water storage tank 15, and eventually the hot water storage tank is filled with high temperature water of a predetermined temperature, and the hot water storage tank reheating operation is completed.

  Next, the operation control means 55 controls the operation / stop of the 1st system and 2nd system heat pump refrigerant circuits 41, 42 and the rotational speed control of the compressors 1a, 1b according to the operation settings of the hot water remote controller 55a and the floor heating remote controller 55b. As well as opening / closing the refrigerant on / off valves 2a, 2b, 2c, opening control of the expansion valves 4a, 4b, 4c, opening / closing of the bath heat exchange on / off valve 26, opening / closing of the floor heating on / off valves 29, 30, the in-machine circulation pump 16 The operation and stop of the bath circulation pump 19 and the floor heating circulation pump 37, and the opening and closing control of the hot water supply mixing valve 10, hot water mixing valve 11, flow rate adjusting valve 12, and bath pouring valve 17 are carried out. The tension operation, the bath reheating operation, the hot water tank renewal operation, the floor heating operation, and the like are smoothly performed.

  Further, the operation control means 55 controls the rotation speed of the compressors 1a and 1b, and immediately after the start of operation, operates at a predetermined high-speed rotation in order to shorten the heating start-up time, and heats during stable operation with a relatively light heat load. Control to drive at low and medium speeds according to the temperature.

  Furthermore, the heat pump hot water supply floor heating device includes discharge port thermistors 1s and 1t that detect the discharge temperatures of the compressors 1a and 1b, evaporator thermistors 5s and 5t that detect frost formation and superheat degree of the evaporators 5a and 5b, and water supply. Water supply thermistor 8s for detecting the temperature of the water supplied from the metal fitting 6, heat exchanger thermistors 3s and 3t for detecting the outlet temperature of the hot water supply heat exchanger 3, and a mixed water thermistor 10s for detecting the water temperature at the outlet of the hot water supply mixing valve 10 , A hot water thermistor 11 s for detecting the hot water temperature after water supply adjustment, a plurality of tank thermistors 15 s for detecting the hot water temperature and the amount of hot water in the hot water storage tank 15, a bath thermistor 18 s for detecting the temperature of hot water for bath hot water, and floor heating Return temperature thermistor 27s for detecting the temperature of the heat medium heated by the heat exchanger 27 for return, and the return heat medium after radiating heat from the floor heating panels 33, 34 Return temperature thermistor 36s for detecting the temperature, and the water level sensor 20 for detecting the water level in the bathtub 23 is provided for each detection signal is configured to be inputted to the operation control unit 55. The operation control means 55 controls each device based on these signals.

  Further, the pressure reducing valve 7 controls, for example, a high water pressure of about 200 to 500 kPa, which is supplied from a water supply source, to a constant water pressure suitable for use of about 170 kPa. Is intended to prevent water from flowing back in only one direction.

  In this embodiment, the hot water supply heat exchanger 3 is divided into a 1-system heat pump refrigerant circuit and a 2-system heat pump refrigerant circuit, and heat exchange thermistors 3s, 3t are provided in the water supply side heat transfer tubes 3c, 3d, respectively. The heat exchanger 3 for hot water supply is integrated with the 1 and 2 systems, and the heat exchange water outlet temperature is reduced by providing a heat exchange thermistor after the outlet of the water supply side heat transfer tubes 3c and 3d. And cost reduction, and one heat exchanger thermistor can be reduced.

  Next, for one embodiment of temperature control in the heat pump hot water supply floor heating apparatus of the present invention, refer to the 1st and 2nd system heat pump refrigerant circuits 41 and 42, the hot water supply circuit 45, the floor heating circuit 50 and the operation control means 55 in FIG. The temperature control table shown in FIG.

  FIG. 2 shows a temperature control table in each operation of hot water supply, floor heating, hot water supply + floor heating. In the temperature control table of FIG. 2, the hot water supply heat exchanger water outlet temperature is simply expressed as the heat exchanger water outlet temperature.

  The temperature control at the time of each operation of hot water supply, floor heating, hot water supply + floor heating is the rotation speed of the 1-system, 2-system compressors 1a, 1b, and the expansion valves 4a for the 1-system hot water supply, 2-system hot water supply and floor heating. This is performed by controlling the opening degree of 4b and 4c so that the control amount becomes the control target value.

  First, in the hot water supply operation, the compressor rotational speed is controlled so that the controlled amount of the heat exchange water outlet temperature becomes the target hot water supply temperature target value in both the first and second systems. The opening degrees of the hot water supply system 1 and the hot water supply expansion valves 4a and 4b are controlled by the controlled value of the evaporator superheat degree or the compressor discharge temperature as the target value of the evaporator superheat degree target value or the compressor discharge temperature target value. It is controlled as follows. Note that a highly efficient refrigeration cycle can be formed by controlling the degree of superheat of the evaporator and the discharge temperature of the compressor to predetermined target values.

  Next, in the case of floor heating operation, the compressor rotation speed of the first system is controlled such that the controlled amount of floor heating going temperature becomes the target value of the floor heating going temperature, and the first system floor heating expansion valve 4c. The degree of opening is controlled so that the evaporator superheat degree of the control amount or the compressor discharge temperature becomes the target value of the evaporator superheat degree target value or the compressor discharge temperature target value.

  Further, in the case of simultaneous operation of hot water supply + floor heating, the compressor rotation speed of system 1 is the higher one of the target hot water supply temperature target value and the floor heating forward temperature target value of the controlled amount of heat exchange water outlet temperature. The two-system compressor rotation speed is controlled such that the controlled amount of heat exchange water outlet temperature becomes the target hot water supply temperature target value. The opening degrees of the hot water supply system 1 and the hot water supply expansion valves 4a and 4b are controlled by the controlled value of the evaporator superheat degree or the compressor discharge temperature as the target value of the evaporator superheat degree target value or the compressor discharge temperature target value. It is controlled as follows. The degree of opening of the 1st floor heating expansion valve 4c is controlled so that the controlled amount of floor heating going temperature becomes the floor heating going temperature target value after the target value is corrected.

  In the temperature control table of FIG. 2, in the case of simultaneous operation of hot water supply and floor heating, the target value of the compressor rotation speed of system 1 is the higher of the hot water supply temperature target value and the floor heating forward temperature target value. The target value of the machine rotation speed is the hot water supply temperature target value, the control amount of the floor heating expansion valve opening is the floor heating forward temperature, and the target value is the corrected floor heating forward temperature target value. During simultaneous operation, the floor heating temperature is not lowered by the hot water supply temperature. Also, regarding the hot water supply temperature, when the 1-system compressor rotation speed is controlled so that the floor heating going-out temperature target value is higher than the hot-water supply temperature target value and the heat exchanger outlet temperature becomes the floor heating going-out temperature target value, The target value for the rotation speed of the second compressor is the hot water supply temperature target value, and since the hot water mixing valve 11 after the heat exchange outlet is adjusted to an appropriate temperature by adding water, there is no problem at all and an appropriate temperature can be obtained for both hot water and floor heating. Optimal temperature control can be performed.

  Here, the floor heating forward temperature target value is corrected because of the relationship between the hot water supply load, the floor heating load, the amount of remaining hot water in the tank, etc. It is assumed that the value is set low.

  FIG. 3 shows a flowchart of a hot water supply operation when hot water is used, and the hot water supply operation when hot water is used by the kitchen faucet 14 will be described with reference to the hot water supply circuit 45 of FIG. 1 and the flowchart of FIG.

  When the kitchen faucet 14 is opened and the use of hot water is started (step 60), the water supply amount sensor 8 detects the flow rate and determines the start of hot water supply. 55 starts the compressors 1a and 1b and starts the heat pump operation. The water supply fitting 6, the pressure reducing valve 7, the water supply amount sensor 8, the water check valve 9, the water supply side heat transfer tubes 3c and 3d, the hot water supply mixing valve 10, The hot water supply operation is started directly by the hot water supply circuit of the hot water mixing valve 11, the flow rate adjusting valve 12, the kitchen tap metal 13, and the kitchen faucet 14 (step 61).

  Here, the operation control means 55 operates the compressors 1a and 1b with the rotation speed control means, circulates the compressed high-temperature and high-pressure refrigerant, and simultaneously opens the refrigerant on-off valves 2a and 2b and closes the refrigerant on-off valve 2c. Thus, the refrigerant circulates in the hot water supply heat exchanger 3, but the refrigerant is not circulated in the floor heating heat exchanger 27. Further, the expansion valves 4a and 4b are adjusted to be opened, and the expansion valve 4c is closed.

  That is, the high-temperature and high-pressure refrigerant compressed by the compressors 1a and 1b is sent to the refrigerant-side heat transfer tubes 3a and 3b of the hot water supply heat exchanger 3 to heat the feed water flowing through the water-supply-side heat transfer tubes 3c and 3d to However, the refrigerant sent to the hot water supply heat exchanger 3 is sufficiently hot and high in pressure immediately after the start of operation, and the temperature is low, and the hot water supply heat exchanger 3 is cooled to heat the water. Since the heating capacity is not sufficient, in parallel with the direct hot water supply operation (step 61), a tank hot water supply operation (step 62) for supplying hot water (for example, 60 to 65 ° C.) previously stored in the tank hot water storage operation is performed. The hot water from the tank hot water is mixed with the hot water supplied from the hot water supply heat exchanger 3 by the hot water mixing valve 10, and further from the hot water mixing valve 11 from the side of the supplied water amount sensor 8 so as to reach an appropriate temperature (about 40 ° C.). After an appropriate amount of cold water is mixed, hot water is supplied to the kitchen faucet 14 through the flow rate adjustment valve 12 and the kitchen outlet 13.

  After the start of the direct hot water supply operation, the refrigerant becomes high temperature and high pressure with the passage of time, and the heat radiation amount generated from the refrigerant increases accordingly, and the heating ability to water increases, but the heat exchange thermistors 3s, 3t, By detecting the mixed water thermistor 10s, the hot water supply thermistor 11s, and the feed water amount sensor 8, the hot water temperature and flow rate are determined (step 63), and if not specified, the compressor rotation is performed so that the hot water temperature becomes an appropriate value (about 40 ° C.). Correction is performed by controlling the speed and the expansion valve and adjusting the hot water supply mixing valve 10 and the water supply mixing valve 11 (step 64).

  Here, as described in FIG. 2, the compressor rotation speed control and the expansion valve control (step 64) are controlled so that the water outlet temperature of the hot water supply heat exchanger 3 becomes the hot water supply temperature target value. The expansion valve opening degree is controlled so that the evaporator superheat degree or the compressor discharge temperature becomes the evaporator superheat degree target value or the compressor discharge temperature target value.

  Further, the direct hot water supply temperature is determined (step 65), and if the direct hot water supply temperature is lower than the appropriate value (about 40 ° C.) and below the specified value, the direct hot water supply operation and the tank hot water supply operation are continued simultaneously. When the temperature reaches an appropriate value (about 40 ° C.) and is within the specified range, the tank hot water supply operation is stopped (step 66), only the direct hot water supply operation is performed (step 67), the faucet is closed, and the hot water supply use is completed (step 68). Continue hot water supply operation until

  In the direct hot water supply operation, the 1-system heat pump refrigerant circuit 41 and the 2-system heat pump refrigerant circuit 42 in FIG. 1 are operated together, and the compressors 1a, 1b perform rotation speed control by the operation control means and are supplied from a water source or the like as a water source. In summer, when the feed water temperature is high, a small heating amount is required, so the rotation speed is slowed down. In winter, when the feed water temperature is low, a large heating amount is needed, so the rotation speed is increased. Further, the operation control means adjusts the opening degree of the expansion valves 4a and 4b during the start-up operation to be small so as to reduce the circulation amount of the refrigerant, thereby increasing the temperature of the refrigerant and shortening the heating rise time of the heat pump. To control.

  When the kitchen faucet 14 is closed and the use of hot water is finished (step 68), the operation control means 55 stops the heat pump operation and stops the direct hot water supply operation (step 69), but at the same time, the hot water storage temperature of the hot water storage tank 15 by the tank thermistor 15s. The hot water storage amount is judged (step 70), and if it is within the specified range, the tank hot water storage operation is terminated (step 73). If it is less than the specified value, the tank hot water storage operation (step 71) is performed. The amount is determined (step 72), and the tank hot water storage operation is terminated (step 73) after reaching the regulation.

  Next, with reference to FIG. 1, the floor heating single operation will be described with reference to FIGS. 4 and 5.

  As described in FIG. 2, the temperature control of the floor heating operation in this embodiment is performed by controlling the compressor rotation speed so that the floor heating forward temperature becomes the floor heating forward temperature target value, and the expansion valve opening is controlled by the evaporator overheating. The floor heating temperature is controlled by controlling the temperature or the compressor discharge temperature to be a predetermined target value.

FIG. 4 shows an example of the initial set value of the floor heating forward temperature target value in the floor heating operation.
The initial target value of the temperature target value is determined in three stages mainly depending on the room temperature. However, if the outside air temperature exceeds 11 ° C in consideration of the heat radiation of the room, the initial set value is 5 ° C. It is set down. That is, when the outside air temperature is relatively high, there is little heat radiation from the room to the outside, and sufficient comfort can be obtained even if the floor heating temperature is set somewhat lower. Therefore, this is an example in which the initial target temperature is set lower.

  The operation control means initially sets the floor heating forward temperature target value according to the temperature setting table of FIG. 4, and uses the floor heating forward temperature target value as an initial set value until a predetermined time (for example, 20 minutes) after the floor heating operation starts. After the predetermined time elapses, the floor heating forward temperature target value is changed according to the use conditions.

The operation and temperature control during floor heating single operation will be described with reference to FIGS. The floor heating button of the floor heating remote control 55b is turned on to start the use of floor heating (step 80), the floor heating range is selected from the two zones 33 and 34, the floor heating return temperature and the floor heating usage time. Is set (step 81), the system 1 heat pump refrigerant circuit and the floor heating circulation pump 37 are started to operate. (Step 82)
That is, in FIG. 1, in the 1-system heat pump refrigerant circuit 41, the refrigerant on-off valve 2a is closed and the refrigerant on-off valve 2c is opened, and the compressor 1a → the refrigerant on-off valve 2c → the floor heating refrigerant pipe 27a → the floor heating expansion valve. The floor heating heating operation is performed in the heat pump circuit of 4c → evaporator 5a → compressor 1a.

  In the floor heating circuit 50, either or both of the floor heating on-off valves 29 and 30 are opened by the selection of the floor heating remote controller 55b, and the floor heating tank 36 → Floor heating circulation pump 37 → floor heating heat transfer pipe 27b → floor heating on / off valve 29, 30 → floor heating hot water supply fittings 31 and 32 → radiation pipes 33a and 34a → floor heating return fitting 35 → floor heating tank 36 In the closed circuit, a heat medium (not shown) circulates, and the heat medium heated by the floor heating heat exchanger 27 heats and radiates the floor by the floor heating panels 33 and 34.

  For the heat medium circulating in the floor heating circuit 50, the forward temperature of the floor heating heat transfer tube 27b is detected by the forward temperature thermistor 27s, and the return temperature of the floor heating tank 36 is detected by the return temperature thermistor 36s. Each temperature information is transmitted to the operation control means 55 as needed.

  Returning to FIG. 5, at the time of start-up operation immediately after the start of the floor heating operation, the control amount of the system 1 compressor is set to the floor heating forward temperature, and the target value is set to the floor heating forward temperature initial set value to thereby operate the floor heating. It is intended to shorten the time required to reach the appropriate temperature.

  The forward temperature control operation is based on detection of the floor heating return temperature and the floor heating return temperature (step 83), for example, when the floor heating return temperature is less than [the floor heating return temperature target value −1 ° C.]. Increase the temperature target value, lower the floor heating return temperature target value when the floor heating return temperature is higher than the floor heating return temperature target value, and maintain the current floor heating return temperature target value in other cases, The floor heating forward temperature target value is changed every predetermined time (for example, 10 minutes) (step 84).

  In addition, the floor heating outbound temperature target value is provided with a minimum value (for example, 30 ° C.) and a maximum value (for example, 70 ° C.), and after the floor heating outbound temperature target value is changed (step 84), the floor heating outbound temperature target value is determined. (Step 85) is performed, and when the changed floor heating going temperature target value is equal to or higher than the minimum value (for example, 30 ° C.), the compressor rotational speed control is performed so that the floor heating going temperature becomes the floor heating going temperature target value. At the same time, expansion valve opening degree control (step 86) is performed so that the evaporator superheat degree or the compressor discharge temperature becomes the evaporator superheat degree target value or the compressor discharge temperature target value, and the operation is continued. When the going-out temperature target value is less than the minimum value (for example, 30 ° C.), the operation of the system 1 heat pump refrigerant circuit is stopped and only the floor heating circulation pump 37 is operated (step 87).

  Further, the floor heating usage time set time elapse determination (step 88) is performed by measuring the time of the timer (step 83). If it is within the set time, the floor heating forward temperature target value correction (step 84) is performed every predetermined time. When the set time is exceeded, the heat pump operation and the floor heating pump operation are stopped and the floor heating operation ends (step 89).

  In the flowchart, each operation is described in series, but this is for convenience and does not necessarily define the order. For example, the determination of the set time elapse (step 88) is always performed, and 1 There is a case where the specified time is reached before the system heat pump operation stop (step 87) and the floor heating operation is ended (step 89).

  Next, temperature control when the hot water supply operation and the floor heating operation using the kitchen faucet are performed simultaneously in FIG. 6 will be described. The details of the single operation of hot water supply and floor heating have been described with reference to FIG. 4 and FIG.

  When the kitchen faucet 14 is opened and hot water usage starts (step 90), the tank hot water supply operation (step 91) and the direct hot water supply operation (step 93) by the heat pump operation (step 92) are performed in parallel.

  The heat pump refrigerant circuit 40 performs compressor rotation speed control and expansion valve opening control (step 94) so as to increase the hot water supply heating capacity in order to shorten the rise time, and in the direct hot water supply temperature determination (step 95), the appropriate hot water supply temperature (about When the temperature reaches 40 ° C., the tank hot water supply operation is stopped (step 96), and the hot water supply is continued only by the direct hot water supply operation (step 97).

  On the other hand, in parallel with the hot water supply operation, when the floor heating button is turned on to start using the floor heating (step 100), the refrigerant on-off valve 2c and the floor heating expansion valve 4c are opened, and the floor heating pump is operated (step 101) and the floor heating operation (step 102) is started.

  The floor heating forward temperature target value is set to an initial set value for a predetermined time (for example, 20 minutes) after the start of the floor heating operation (step 103), and after the predetermined time (for example, 20 minutes) has elapsed, the corrected floor heating forward temperature target value is To do.

Further, the operation control is performed as follows using the temperature control table described in detail with reference to FIG. (Step 104)
The compressor rotation speed of system 1 is controlled so that the heat exchange water outlet temperature becomes the higher of the hot water supply temperature target value and the floor heating forward temperature target value (step 104a). It is controlled so that the water outlet temperature becomes the hot water supply temperature target value. The opening degrees of the 1-system hot water supply expansion valve 4a and the 2-system expansion valve 4b are set to the evaporator superheat degree target value or the compressor discharge temperature target value where the evaporator superheat degree or the compressor discharge temperature is a predetermined target value. (Step 104b). The opening degree of the 1st floor heating expansion valve 4c is controlled so that the floor heating forward temperature becomes the corrected floor heating forward temperature target value (step 104c).

  The correction of the floor heating forward temperature target value here is performed based on the relationship between the hot water supply load, the floor heating load, the amount of remaining hot water in the tank, etc. This is a low setting.

  Specifically, for example, when the target hot water supply temperature target value for system 1 is 60 ° C. and the target heating floor temperature is 50 ° C., the compressor rotation speed of system 1 is controlled at 60 ° C., so the hot water supply is heated. There is no problem if hot water is supplied as it is. On the other hand, since the floor heating going-out temperature needs to be lowered by 10 ° C., the amount of refrigerant circulation on the side of the floor heating refrigerant pipe 27a is reduced by reducing the opening of the 1st floor heating expansion valve 4c from the current level. Heating temperature can be lowered. On the other hand, when the target hot water temperature target value for system 1 is 50 ° C. and the target temperature for floor heating outgoing temperature is 60 ° C., the compressor for system 1 and the expansion valve for floor heating are controlled at 60 ° C. no problem. Here, the hot water supply temperature of the kitchen hot metal fitting 13 or the incoming / outgoing hot metal fitting 21 needs to be lowered by 10 ° C., but can be kept at 50 ° C. by increasing the amount of water supplied from the hot water mixing valve 11.

  As described above, the target value of the first system compressor rotational speed is the higher of the hot water supply temperature target value and the floor heating forward temperature target value, and the second system compressor rotational speed target value is the hot water supply temperature target value. Since the control amount of the opening degree of the heating expansion valve 4c is the floor heating forward temperature and the target value is the corrected floor heating forward temperature target value, the floor heating temperature becomes the hot water supply temperature during simultaneous operation of hot water supply and floor heating. There is no fear of being pulled down. In addition, with respect to the hot water supply temperature, the 1-system compressor rotation speed was controlled so that the floor heating forward temperature target value was higher than the hot water supply temperature target value and the floor heating forward temperature target value was higher when the heat exchanger outlet temperature was higher. Even in this case, the target value of the rotation speed of the second compressor is the hot water supply temperature target value, and there is no problem because the hot water mixing valve 11 after the heat exchange outlet is adjusted to an appropriate temperature by adding water. An appropriate temperature can be obtained and optimum temperature control can be performed.

  In use of hot water, the hot water supply operation (step 105) is continued while temperature control (step 104) is continued. When the faucet is closed and hot water use ends (step 106), determination of hot water temperature and amount of hot water (step 106). 107), if necessary, a tank hot water storage operation (step 108) is performed to sufficiently store hot water, and then the hot water storage operation is terminated (step 109).

  In the floor heating operation, the floor heating operation is continued (step 110) while the temperature control (step 104) is continued, and the change of the floor heating forward temperature target value and the temperature control are repeated. In the floor heating going temperature determination (step 111), when the changed floor heating going temperature target value reaches less than the specified value, the heat pump operation is stopped and only the floor heating pump is operated. Further, a set time elapse determination of the floor heating use time is performed (step 113). If the set time is exceeded, the heat pump operation and the floor heating pump operation are stopped and the floor heating operation is ended (step 114).

  As described above in detail, the present invention relates to operation control in the case of simultaneous use of hot water supply and floor heating in a heat pump hot water floor heater having a direct hot water supply circuit in two cycles, and has a direct hot water supply circuit. If there is, it can be applied regardless of the size of the hot water storage tank or the presence or absence of hot water storage at night, and has the same effect.

It is a schematic diagram which shows one Example of schematic structure of the heat pump hot-water supply floor heating apparatus of this invention. It is a temperature control figure which shows one Example of the temperature control in the heat pump hot-water supply floor heating apparatus of this invention. It is a flowchart which shows one Example of the hot water supply operation at the time of the hot water use in the heat pump hot water supply floor heating apparatus of this invention. It is a temperature setting table | surface which shows one Example of the initial value of the floor heating going temperature target value in the heat pump hot-water supply floor heating apparatus of this invention. It is a flowchart which shows one Example of the floor heating driving | operation in the heat pump hot water supply floor heating apparatus of this invention. It is a flowchart which shows one Example of the simultaneous operation | movement with the hot water supply operation and floor heating operation in the heat pump hot water supply floor heating apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b Compressor 2a, 2b, 2c Refrigerant on-off valve 3 Heat exchanger for hot water supply 4a, 4b, 4c Expansion valve 5a, 5b Evaporator 10 Hot water mixing valve 11 Hot water mixing valve 15 Hot water storage tank 27 Heat exchanger 33 for floor heating , 34 Floor heating panel 40 Heat pump refrigerant circuit 41 1 system heat pump refrigerant circuit 42 2 system heat pump refrigerant circuit 45 hot water supply circuit 50 floor heating circuit 55 operation control means

Claims (5)

A first compressor, a first hot water supply heat exchanger, a first hot water supply expansion valve, a first evaporator, a floor heating heat exchanger, and a floor heating expansion valve, the first hot water supply 1 system heat pump refrigerant circuit connected in parallel with the heat exchanger for floor heating and the expansion valve for floor heating, the heat exchanger for heating and the first hot water supply expansion valve;
A second heat pump refrigerant circuit configured to include a second compressor, a second hot water supply heat exchanger, a second hot water supply expansion valve, and a second evaporator;
A direct hot water supply circuit for directly supplying hot water heated by the first and second hot water supply heat exchangers from a hot water fitting;
A floor heating circuit for circulating hot water heated by the heat exchanger for floor heating;
In a heat pump hot water supply floor heating apparatus comprising operation control means for controlling rotation speeds of the first and second compressors, opening degrees of the first and second hot water supply expansion valves and the floor heating expansion valve. ,
When the hot water supply and the floor heating are simultaneously operated, the operation control means sets the control amount of the compressor rotational speed to the water outlet temperature of the hot water heat exchanger for both the first and second systems, and sets the target value of the compressor rotational speed to 1 The system is the higher of the hot water supply temperature target value and the floor heating forward temperature target value, the 2 system is the hot water supply temperature target value,
The control amount of the hot water supply expansion valve is set to the degree of evaporator superheat or compressor discharge temperature in both systems 1 and 2, and the target value is a predetermined target value. A heat pump hot water supply floor heating apparatus characterized in that a temperature and a target value are set as a floor heating forward temperature target value. 2. The heat pump hot water supply floor heating apparatus according to claim 1, wherein temperature thermistors are respectively provided at a water side heat transfer tube outlet of the first hot water supply heat exchanger and a water side heat transfer tube outlet of the second hot water supply heat exchanger. The heat pump hot water supply floor heating device according to claim 1, wherein the operation control means has a correction function of changing the floor heating forward temperature target value according to a use condition. The first and second hot water supply heat exchangers are integrated, and a heat exchange thermistor is provided at a position immediately after the water supply side heat transfer tubes of the first and second hot water supply heat exchangers merge. The heat pump hot water supply floor heating apparatus according to claim 1, wherein A first compressor, a first hot water supply heat exchanger, a first hot water supply expansion valve, a first evaporator, a floor heating heat exchanger, and a floor heating expansion valve, the first hot water supply A heat exchanger for heat and a first hot water supply expansion valve connected in parallel with the heat exchanger for floor heating and the expansion valve for floor heating;
A second heat pump refrigerant circuit composed of a second compressor, a second hot water supply heat exchanger, a second hot water supply expansion valve, and a second evaporator;
A direct hot water supply circuit for directly supplying hot water heated by the first and second hot water supply heat exchangers from a hot water fitting;
A floor heating circuit for circulating hot water heated by the heat exchanger for floor heating;
A first and second hot water supply heat exchanger, a hot water mixing valve, a hot water storage tank for storing hot water heated by the first and second hot water supply heat exchangers, and a hot water storage circuit comprising an in-machine circulation pump;
A tank hot water supply circuit that mixes hot water heated by the first and second hot water supply heat exchangers and hot water stored in the hot water storage tank and supplies hot water from the hot water fitting;
In a heat pump hot water supply floor heating apparatus comprising operation control means for controlling rotation speeds of the first and second compressors, opening degrees of the first and second hot water supply expansion valves and the floor heating expansion valve. ,
When the hot water supply and the floor heating are simultaneously operated, the operation control means sets the control amount of the compressor rotational speed to the water outlet temperature of the hot water heat exchanger for both the first and second systems, and sets the target value of the compressor rotational speed to 1 The system is the higher of the hot water supply temperature target value and the floor heating forward temperature target value, the 2 system is the hot water supply temperature target value,
The control amount of the hot water supply expansion valve is set to the degree of evaporator superheat or compressor discharge temperature in both systems 1 and 2, and the target value is a predetermined target value. A heat pump hot water supply floor heating apparatus characterized in that a temperature and a target value are set as a floor heating forward temperature target value.

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