JP5892371B2 - Water heating system - Google Patents

Description

  The present invention relates to a feed water heating system using a heat pump.

  Conventionally, as disclosed in Patent Document 1 below, a system capable of heating water supplied to a water supply tank (23) of a boiler (24) using a heat pump (12) is known. In this system, the water supply tank (23) can supply water from a water supply source (21) via a water supply channel, and can also supply water via a heat pump water heater (12) branched from the water supply channel. When the water supply tank (23) falls below the first water level (52L), water supply from the heat pump water heater (12) is started, and when the water supply tank (23) exceeds the second water level (52H) higher than the first water level, the heat pump Water supply from the water heater (12) is stopped. When the water level is lower than the third water level (32L), which is lower than the first water level, water supply from the water supply source (21) is started, and the fourth water level is higher than the third water level but lower than the first water level. If it exceeds (32H), the water supply from a water supply source (21) will be stopped.

JP 2010-25431 A (Claim 4, FIG. 2-3)

  In the invention described in Patent Document 1, depending on the water level in the water supply tank, whether to supply water via a heat pump, to supply water directly, or to stop all water supply can be switched.

  However, when water is supplied via the heat pump, the output of the heat pump is constant, and water supply to the water supply tank cannot be performed quickly and efficiently according to the usage load of the stored water in the water supply tank.

  Therefore, the problem to be solved by the present invention is to quickly and efficiently supply water to the water supply tank according to the use load of the stored water in the water supply tank in the water supply heating system using the heat pump.

The present invention has been made to solve the above problems, and the invention according to claim 1 is characterized in that a compressor, a condenser, an expansion valve, and an evaporator are sequentially connected in an annular manner to circulate a refrigerant, and the evaporation. A heat pump that draws heat from a heat source fluid that is passed through a condenser and heats water that is passed through the condenser, wherein the output can be changed by changing the number of revolutions of the motor of the compressor with an inverter And a water supply tank capable of supplying water through a water supply channel via the condenser of the heat pump and capable of supplying water through a replenishment water channel without passing through the condenser, and a boiler supplied from the water supply tank. based on the water level in the tank, and water supply to the water supply tank through the water supply passage to control the rotational speed of the motor of the compressor, the water supply condition from the water supply tank to the boiler or the voice, Based on the operating conditions, a water heating system and controls the water supply to the water supply tank through the supply water path.

  According to invention of Claim 1, while changing the output of a heat pump based on the water level in a water supply tank, while supplying water to a water supply tank via a water supply channel, it is based on the water supply state to a boiler, or the driving | running state of a boiler. The water supply to the water supply tank via the replenishment water channel can be controlled. Thereby, the water supply to the water supply tank according to the load of a boiler can be performed rapidly.

  According to a second aspect of the present invention, the amount of water flow to the condenser is adjusted so that the water temperature on the outlet side of the condenser of the heat pump is maintained at a set temperature during water supply to the water supply tank via the water supply passage. The feed water warming system according to claim 1, wherein:

  According to the second aspect of the present invention, the amount of water flow to the condenser is adjusted so that the water temperature at the outlet side of the condenser of the heat pump is maintained at the set temperature during the water supply to the water supply tank via the water supply channel. Thus, the water supply temperature via the water supply channel can be maintained as desired.

  According to a third aspect of the present invention, the heat pump can be switched between a low load operation and a high load operation with a higher output than this, and water supply to the water supply tank via the water supply path is performed by the water supply tank. When the water level is lower than the first water level (H1), the heat pump is operated with a low load, and when the water level is lower than the switching water level (H1 ′) lower than the first water level, the heat pump is operated with a high load. It stops when it exceeds the 2nd water level (H2) higher than a water level, The feed water heating system of Claim 1 or Claim 2 characterized by the above-mentioned.

  According to invention of Claim 3, based on the water level in a water supply tank, it can supply water to a water supply tank simply and efficiently, controlling a heat pump in three positions, high load operation, low load operation, and a stop. .

  Furthermore, in the invention according to claim 4, the heat pump can be switched between a low load operation, a medium load operation with a higher output than this, and a high load operation with a higher output than this, and the heat pump is connected via the water supply channel. The water supply to the water supply tank is performed while operating the heat pump at a low load when the water level of the water supply tank is lower than the first water level, and when the water level is lower than the predetermined water level lower than the first water level but higher than the switching water level, The feed water warming system according to claim 3, wherein the heat pump is operated while operating at a medium load, and when the temperature falls below the switching water level, the heat pump is operated while operating at a high load.

  According to the fourth aspect of the present invention, water can be easily and efficiently supplied to the water supply tank while controlling the heat pump at the four positions of high load operation, medium load operation, low load operation and stop.

  ADVANTAGE OF THE INVENTION According to this invention, in the feed water heating system using a heat pump, the water supply to a water supply tank can be rapidly and efficiently performed according to the use load of the stored water in a water supply tank.

It is the schematic which shows one Example of the feed water heating system of this invention. It is a figure which shows an example of the control method of the heat pump in the feed water heating system of FIG.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic view showing an embodiment of a feed water warming system 1 of the present invention.

  The feed water warming system 1 of the present embodiment is a system that can heat the feed water to the feed water tank 3 of the boiler 2 with the heat pump 4. The feed water tank 3 that stores the feed water to the boiler 2, and the feed water tank 3 A replenishment water tank 5 for storing water supply, a heat pump 4 for heating water supplied from the replenishment water tank 5 to the water supply tank 3, and a heat source water tank for storing heat source water (for example, waste hot water) as a heat source of the heat pump 4. 6.

  The boiler 2 is a steam boiler, and heats the feed water from the feed water tank 3 into steam. The steam from the boiler 2 is sent to various steam use facilities (not shown), but drain (condensed water of steam) from the steam use facility may be returned to the water supply tank 3.

  The boiler 2 is typically controlled in combustion quantity so as to maintain the steam pressure as desired. Here, control is performed at three positions: a high combustion state (100% combustion), a low combustion state (50% combustion), and a stop. This control is performed by a boiler control panel (not shown) grasping the use load of the steam based on the pressure of the steam to the steam using facility and adjusting the combustion amount of the burner of the boiler 2.

  The boiler 2 is controlled to supply water to the boiler 2 so as to maintain a desired water level in the can. Specifically, the pump 7 provided in the water supply path from the water supply tank 3 to the boiler 2 is controlled based on the water level in the can body by the boiler control panel.

  The water supply tank 3 can be supplied with water from the make-up water tank 5 via the heat pump 4 through the water supply path 8 and can be supplied through the make-up water path 9 without going through the heat pump 4. By controlling the operation of the water supply pump 10 provided in the water supply path 8 and the makeup water pump 11 provided in the makeup water path 9, via either one or both of the water supply path 8 and the makeup water path 9, Water can be supplied from the makeup water tank 5 to the water supply tank 3. In the water supply passage 8, a waste heat recovery heat exchanger 12 and a heat pump 4 are sequentially provided downstream from the water supply pump 10.

  In the present embodiment, the feed water pump 10 can control the rotation speed by an inverter. By changing the rotation speed of the water supply pump 10, the amount of water supplied to the water supply tank 3 via the water supply path 8 can be adjusted. On the other hand, the makeup water pump 11 is on / off controlled in the present embodiment, but may be inverter-controlled in the same manner as the feed water pump 10 in some cases.

  The makeup water tank 5 stores water supplied to the water supply tank 3. In this embodiment, soft water is used as the water supply to the makeup water tank 5. That is, the soft water from which the water hardness has been removed by the water softener (not shown) is supplied to the makeup water tank 5 and stored. By controlling the water supply from the water softener based on the water level of the makeup water tank 5, the water level of the makeup water tank 5 is maintained as desired.

  The heat pump 4 is a vapor compression heat pump, and is configured by sequentially connecting a compressor 13, a condenser 14, an expansion valve 15, and an evaporator 16 in an annular shape. The compressor 13 compresses the gas refrigerant to a high temperature and a high pressure. The condenser 14 condenses and liquefies the gas refrigerant from the compressor 13. Further, the expansion valve 15 allows the liquid refrigerant from the condenser 14 to pass through, thereby reducing the pressure and temperature of the refrigerant. The evaporator 16 then evaporates the refrigerant from the expansion valve 15.

  Therefore, in the heat pump 4, in the evaporator 16, the refrigerant takes heat from the outside and vaporizes, while in the condenser 14, the refrigerant dissipates heat to the outside and condenses. In this embodiment, the heat pump 4 draws heat from the heat source water as a heat source in the evaporator 16 and heats the water in the water supply channel 8 in the condenser 14.

  The heat pump 4 may be provided with a supercooler 17 between the condenser 14 and the expansion valve 15 as desired. The supercooler 17 is an indirect heat exchanger between the refrigerant from the condenser 14 to the expansion valve 15 and the feed water to the condenser 14. The subcooler 17 can supercool the refrigerant from the condenser 14 to the expansion valve 15 by supplying water to the condenser 14, and can supply the refrigerant to the condenser 14 by the refrigerant from the condenser 14 to the expansion valve 15. The water supply can be heated. The refrigerant of the heat pump 4 releases latent heat in the condenser 14 and releases sensible heat in the subcooler 17.

  In addition, in the heat pump 4, an accumulator is installed on the inlet side of the compressor 13, an oil separator is installed on the outlet side of the compressor 13, or the outlet side of the condenser 14 (the condenser 14 and the subcooler 17 A receiver may be installed between the two).

  By the way, the heat pump 4 can change the output (the capacity | capacitance of the compressor 13) in steps. In the present embodiment, the heat pump 4 can be switched between a low load operation and a high load operation with a higher output by changing the rotation speed of the motor of the compressor 13 with an inverter. For example, full load operation (100% output) is performed in a high load operation, and low load operation (for example, 50% output) is performed in a low load operation rather than a high load operation.

  The heat source water tank 6 stores heat source water as a heat source of the heat pump 4. The heat source water is, for example, waste hot water (hot water discharged from a factory or the like). The heat source water tank 6 is provided with a heat source water supply path 18 and an overflow path 19 for overflowing a predetermined amount or more of water.

  The water in the heat source water tank 6 passes through the evaporator 16 of the heat pump 4 through the heat source supply path 20 and then passes through the waste heat recovery heat exchanger 12. The heat source supply path 20 is provided with a heat source supply pump 21 on the upstream side of the evaporator 16. By operating the heat source supply pump 21, the heat source water from the heat source water tank 6 is discarded with the evaporator 16. The heat recovery heat exchanger 12 can be passed through in order.

  The waste heat recovery heat exchanger 12 is an indirect heat exchanger for supplying water from the makeup water tank 5 to the supercooler 17 and heat source water from the evaporator 16. In the case of the present embodiment, the water supply from the makeup water tank 5 to the water supply tank 3 through the water supply channel 8 is sequentially passed from the makeup water tank 5 through the waste heat recovery heat exchanger 12, the supercooler 17 and the condenser 14. Then, the water is supplied to the water supply tank 3.

  In the water supply path 8, a water temperature sensor 22 is provided on the outlet side of the condenser 14. The water temperature sensor 22 detects the water temperature after passing through the condenser 14. Based on the temperature detected by the water temperature sensor 22, the water supply pump 10 is controlled. Here, the feed water pump 10 is inverter-controlled so as to maintain the temperature detected by the water temperature sensor 22 at a set temperature T1 (for example, 75 ° C.). That is, the flow rate of water supplied to the water supply tank 3 through the water supply path 8 is adjusted so that the temperature detected by the water temperature sensor 22 is maintained at the set temperature T1. However, in some cases, such flow rate adjustment control by the water temperature sensor 22 can be omitted.

  A water level detector 23 is provided in the water supply tank 3. The configuration of the water level detector 23 is not particularly limited. In the present embodiment, an electrode type water level detector is used. That is, a plurality of electrode rods 24 to 26 having different lengths are inserted and held in the water supply tank 3 with their lower end portions having different height positions. Specifically, the water supply stop electrode rod 24, the water supply start electrode rod 25, and the load switching electrode rod 26 are inserted into the water supply tank 3 with the height position of the lower end portion lowered in order. Each electrode rod 24-26 detects the presence or absence of the water level in a lower end part by whether the lower end part is immersed in water.

  The heat source water tank 6 is provided with a water level detector 27 in order to confirm the presence or absence of heat source water as a heat source of the heat pump 4. The configuration of the water level detector 27 is not particularly limited. In the present embodiment, an electrode type water level detector is used. That is, the low water level detection electrode rod 28 is inserted into the heat source water tank 6, and it is monitored whether the water level of the heat source water is below the setting. The heat source water tank 6 may be provided with a heat source temperature sensor 29 that detects the temperature of the heat source water.

  Next, control (operation method) of the feed water heating system 1 of the present embodiment will be described. A series of control described below is automatically performed using a controller (not shown).

  Drawing 2 is a figure showing an example of a control method of heat pump 4 in feed water warming system 1 of this example. As shown in this figure, the heat pump 4 (particularly, the compressor 13) and the water supply pump 10 are controlled based on the water level of the water supply tank 3.

  Here, the heat pump 4 is switched between operation and stop depending on whether or not the compressor 13 is activated. In addition, as described above, in this embodiment, the heat pump 4 performs high load operation (typically full load operation = 100% output), low load operation (for example, 50% output), and stop (0% output). Controlled in three positions.

  On the other hand, the water supply pump 10 is interlocked with the operation of the heat pump 4, the water supply pump 10 is also operated while the heat pump 4 is being operated, and the water supply pump 10 is also stopped while the heat pump 4 is being stopped. However, as described above, the rotation speed of the water supply pump 10 is inverter-controlled so as to maintain a desired temperature detected by the water temperature sensor 22 during operation. As a result, it is possible to supply water to the water supply tank 3 through the water supply path 8 at a higher flow rate during high load operation of the heat pump 4 than during low load operation.

  Now, when the water supply stop electrode rod 24 detects the water level and the water level in the water supply tank 3 is sufficient (when the water level in the water supply tank 3 is higher than the second water level H2), the water supply to the water supply tank 3 is Since it is unnecessary, the heat pump 4 is stopped (that is, the water supply pump 10 is also stopped).

  When the water level from the water supply tank 3 to the boiler 2 is lowered, the water level in the water supply tank 3 falls below the first water level H1, and the water supply start electrode rod 25 no longer detects the water level, the heat pump 4 is turned on. Operate with low load. As a result, water is supplied to the water supply tank 3 through the water supply path 8, but when the water level in the water supply tank 3 exceeds the second water level H2 and the water supply stop electrode rod 24 detects the water level, the heat pump 4 is stopped.

  Even if the water level in the water supply tank 3 falls below the first water level H1 and the heat pump 4 is operated at a low load, the water level cannot be recovered, the water level in the water supply tank 3 falls below the switching water level H1 ′, and the load switching electrode rod 26 is at the water level. When it is no longer detected, the heat pump 4 is switched to high load operation. As a result, water is supplied to the water supply tank 3 through the water supply channel 8 at a flow rate higher than that during low-load operation, but the water level in the water supply tank 3 exceeds the first water level H1, and the water supply start electrode rod 25 detects the water level. Then, the heat pump 4 is switched to low load operation, and when the water level in the water supply tank 3 exceeds the second water level H2 and the water supply stop electrode rod 24 detects the water level, the heat pump 4 is stopped.

  When the heat pump 4 is operated to supply water from the make-up water tank 5 to the water supply tank 3 through the water supply path 8, the water supplied from the make-up water tank 5 is used as the waste heat recovery heat exchanger 12, the supercooler 17, and the condenser. 14 is gradually heated and supplied to the water supply tank 3 at a predetermined temperature. Compared with the case where water is circulated between the water supply tank 3 and the heat pump 4, the water supply is heated by a single pass (once through) from the makeup water tank 5 to the water supply tank 3, so that it passes through the heat pump 4. It is possible to secure a temperature difference between before and after the water supply and improve the coefficient of performance (COP) of the heat pump 4.

  By the way, during operation of the heat pump 4, that is, during water supply to the water supply tank 3 through the water supply path 8, the water temperature in the heat source water tank 6 is monitored by the heat source temperature sensor 29, and the low load operation of the heat pump 4 is performed based on the temperature. The hour output may be adjusted. That is, in the above embodiment, the low load operation is set to 50% output of the full load operation, but this output% may be changed according to the temperature detected by the heat source temperature sensor 29. The higher the temperature of the heat source water as the heat source of the heat pump 4, the lower the output% during low load operation. By adjusting the output at the time of low load operation of the heat pump 4 in consideration of the temperature of the heat source water, it is possible to stabilize the water supply flow rate to the water supply tank 3 via the water supply path 8 regardless of the temperature change of the heat source water. it can.

  Further, the output during low load operation of the heat pump 4 may be set to a higher output when the water level in the water supply tank 3 is lower than when the water level is increased. That is, when the water level in the water supply tank 3 falls below the first water level H1, the output (for example, the rotational speed) of the compressor 13 during the low load operation when the heat pump 4 is switched from the stopped state to the low load operation is the water supply When the water level in the tank 3 exceeds the first water level H1, the heat pump 4 may be set to a higher output than the output of the compressor 13 during the low load operation when the heat pump 4 is switched from the high load operation to the low load operation. . By raising the output of the heat pump 4 when the water level is lowered, the water level can be quickly recovered.

  Further, when the water level in the heat source water tank 6 falls and the low water level detection electrode rod 28 no longer detects the water level, the operation of the heat pump 4 is stopped and the heat source supply pump 21 is stopped to supply the heat source water to the evaporator 16. It is better to stop the supply. This prevents the heat pump 4 from being wasted.

  The water supply from the makeup water tank 5 to the water supply tank 3 via the water supply channel 8 is performed as described above, but the water supply from the makeup water tank 5 to the water supply tank 3 via the makeup water channel 9 is performed from the water supply tank 3. Control is performed based on the state of water supply to the boiler 2 or the operating state of the boiler 2.

  For example, on-off control of the makeup water pump 11 is performed based on the feed water flow rate from the feed water tank 3 to the boiler 2. Specifically, a flow switch, a flow sensor 30 and the like are provided in the water supply path from the water supply tank 3 to the boiler 2, and when the water supply to the boiler 2 exceeds the upper limit flow rate, the make-up water pump 11 is operated and the lower limit flow rate is reduced. If it falls below, the makeup water pump 11 may be stopped. If the water supply flow rate from the water supply tank 3 to the boiler 2 is grasped and it is determined that the water supply to the water supply tank 3 by the water supply path 8 via the heat pump 4 is not enough, the water supply tank 3 is also supplied via the supply water path 9. Water is supplied. In some cases, the makeup water pump 11 may be controlled based on the operation signal of the feed pump 7 provided in the feed channel from the feed tank 3 to the boiler 2 instead of the flow switch or the flow sensor 30.

  Further, water supply to the water supply tank 3 through the supply water channel 9 may be performed by controlling the supply water pump 11 based on the operation state of the boiler 2 (high combustion, low combustion or stop signal of the boiler control panel). Good. For example, the makeup water pump 11 may be operated only when the boiler 2 is in a high combustion state. Alternatively, as described below, the makeup water pump 11 may be inverter-controlled based on the operation state of the boiler 2.

  In other words, the replenishing water pump 11 can be controlled at three positions: a rotational speed for low combustion, a rotational speed for high combustion higher than this, and a stop speed. And when the boiler 2 has stopped, the makeup water pump 11 may also be stopped according to it and the water supply to the water supply tank 3 via the makeup water channel 9 may be stopped. Further, when the boiler 2 is in a low combustion state, the supply water pump 11 may be supplied to the water supply tank 3 through the supply water passage 9 while operating the supply water pump 11 at a low combustion rotational speed. Furthermore, when the boiler 2 is in a high combustion state, water may be supplied to the water supply tank 3 via the supply water passage 9 while operating the supply water pump 11 at a high combustion rotational speed accordingly.

  The feed water warming system 1 of the present invention is not limited to the configuration of the above embodiment, and can be changed as appropriate. For example, in the above-described embodiment, an example in which the switching water level H1 ′ is set to one and the heat pump 4 is controlled at three positions of high load operation, low load operation, and stop has been described. You may control in four positions or more.

  Specifically, the load switching electrode rod 26 is a first load switching electrode rod and a second load switching electrode rod, and the heat pump 4 is operated at a high load (typically full load operation = 100% output). Then, the control is performed in four positions: a medium load operation (for example, 80% output) with a lower output, a low load operation (for example, 50% output) with a lower output, and a stop.

  Then, water supply to the water supply tank 3 through the water supply path 8 is performed while the heat pump 4 is operated at a low load when the water level of the water supply tank 3 falls below the first water level H1, and is lower than the first water level H1, but is the switching water level H1 ′. If it falls below the higher predetermined water level, it will carry out while carrying out medium load operation, and if it falls below switching water level H1 ', it will carry out while carrying out high load operation of heat pump 4.

  Specifically, if the water supply stop electrode rod 24, the water supply start electrode rod 25, the first load switching electrode rod, and the second load switching electrode rod are installed in the water supply tank 3 with the lower end portion lowered in order. Good. When the water level is lowered, the heat pump 4 operates at a low load when the water supply start electrode rod 25 no longer detects the water level, and switches to the medium load operation when the first load switching electrode rod no longer detects the water level, and switches to the second load. When the electrode bar no longer detects the water level, it switches to high load operation. Conversely, when the water level rises, the heat pump 4 switches to the medium load operation when the first load switching electrode detects the water level, switches to the low load operation when the water supply start electrode rod 25 detects the water level, and the water supply stop electrode rod 24 moves to the water level. Stops when it is detected. Other configurations are the same as those of the above-described embodiment and modification examples, and thus the description thereof is omitted.

  Further, the heat pump 4 is not limited to a single stage, and may be a plurality of stages. When the heat pump 4 has a plurality of stages, adjacent stage heat pumps may be connected using an indirect heat exchanger, or may be connected using a direct heat exchanger (intercooler). In the latter case, an intermediate cooler that receives the refrigerant from the compressor of the lower heat pump and the refrigerant from the expansion valve of the upper heat pump and directly exchanges heat between the two refrigerants is provided. And the evaporator of the upper heat pump. As described above, the multi-stage (multi-stage) heat pump 4 includes a single-stage multi-stage heat pump, a multi-element (multi-element) heat pump, or a combination of them.

  Further, if water can be supplied to the water supply tank 3 through the water supply channel 8 via the condenser 14 and water can be supplied through the replenishment water channel 9 without going through the condenser 14, the specifics of the water supply channel 8 and the water supply channel 9 are specified. The configuration is not limited to the configuration of the above embodiment and can be changed as appropriate. For example, in the above-described embodiment, the water supply channel 8 and the supply water channel 9 are provided in parallel so as to connect the supply water tank 5 and the water supply tank 3, respectively, but one end portion of the water supply channel 8 and the supply water channel 9 ( One or both of the end portion on the make-up water tank 5 side and the other end portion (the end portion on the water supply tank 3 side) may be a common conduit. In other words, one end of the makeup water channel 9 may be provided so as to branch from the water supply channel 8 instead of being connected to the makeup water tank 5, and the other end of the makeup water channel 9 is connected to the water supply tank 3. Instead, it may be provided so as to join the water supply path 8 before the water supply tank 3. When one end portion of the replenishment water channel 9 is provided so as to branch from the water supply channel 8 instead of being connected to the replenishment water tank 5, the water supply pump 10 is provided in the water supply channel 8 downstream from the branching unit, while the replenishment water channel 9 may be provided with a supplementary water pump 11, but a pump is provided only in the common pipe upstream of the branching portion, and the valves provided in the water supply passage 8 and / or the supplementary waterway 9 downstream of the branching portion are opened. By adjusting the degree, the flow rate through the water supply channel 8 and the replenishment channel 9 may be adjusted.

  Moreover, in the said Example, although the supplementary water tank 5 was installed in order to store the water supply to the water supply tank 3, installation of the supplementary water tank 5 may be abbreviate | omitted by the case, and the water supply path 8 and the supplement may be directly from a water supply source. Water may be passed through the water channel 9.

  Moreover, in the said Example, in order to adjust the water supply flow volume to the water supply tank 3 via the water supply path 8, the water supply pump 10 was inverter-controlled, However, The water supply pump 10 was provided in the water supply path 8 while performing on-off control. The opening degree of the valve may be adjusted. That is, if the flow rate of the water supply through the water supply path 8 can be adjusted based on the temperature detected by the water temperature sensor 22, the flow rate adjustment method can be changed as appropriate.

  Similarly, in order to adjust the feed water flow rate to the feed water tank 3 via the make-up water channel 9, instead of performing the inverter control of the make-up water pump 11, an on-off control of the make-up water pump 11 is provided in the make-up water channel 9. The valve opening may be adjusted.

  Moreover, in the said Example, although it was made possible to supply water from the makeup water tank 5 to the water supply tank 3 via the water supply channel 8 and / or the makeup water channel 9, these water supply may be performed directly from a water softener. For example, in FIG. 1, instead of omitting the installation of the water supply pump 10 by connecting the base ends of the water supply channel 8 and the makeup water channel 9 together to the water softener, the opening of an electric valve (motor valve) provided in the water supply channel 8 Instead of adjusting the degree and omitting the installation of the makeup water pump 11, the opening and closing and the opening degree of the valve provided in the makeup water channel 9 may be controlled.

  Furthermore, although the said Example demonstrated the example which used heat-source water as a heat source of the heat pump 4, as a heat-source fluid of the heat pump 4, not only heat-source water but various fluids, such as air and waste gas, can be used.

DESCRIPTION OF SYMBOLS 1 Supply water heating system 2 Boiler 3 Supply water tank 4 Heat pump 5 Supply water tank 6 Heat source water tank 7 Pump 8 Supply water path 9 Supply water channel 10 Supply water pump 11 Supply water pump 12 Waste heat recovery heat exchanger 13 Compressor 14 Condenser 15 Expansion Valve 16 Evaporator 17 Supercooler 18 Supply path 19 Overflow path 20 Heat source supply path 21 Heat source supply pump 22 Water temperature sensor 23 Water level detector 24 Water supply stop electrode rod 25 Water supply start electrode rod 26 Load switching electrode rod 27 Water level detector 28 Low Water level detection electrode rod 29 Heat source temperature sensor 30 Flow rate sensor H1 First water level H1 ′ Switching water level H2 Second water level

Claims (4)

A compressor, a condenser, an expansion valve, and an evaporator are sequentially connected in an annular manner to circulate the refrigerant, draw up heat from a heat source fluid that passes through the evaporator, and heat water that passes through the condenser A heat pump capable of changing the output by changing the rotation speed of the motor of the compressor with an inverter ,
A water supply tank capable of supplying water by a water supply channel via a condenser of the heat pump, and capable of supplying water by a replenishment water channel without using the condenser,
A boiler that is supplied with water from this water supply tank,
Based on the water level of the water supply tank, controlling the water supply to the water supply tank via the water supply path and the rotation speed of the motor of the compressor ,
A water supply and heating system characterized by controlling water supply to the water supply tank via the makeup water channel based on a water supply state from the water supply tank to the boiler or an operating state of the boiler. The amount of water flow to the condenser is adjusted so that the outlet water temperature of the condenser of the heat pump is maintained at a set temperature during water supply to the water supply tank via the water supply path. Water supply heating system described in 1. The heat pump can be switched between a low load operation and a high load operation with a higher output than this,
The water supply to the water supply tank via the water supply channel is performed while the heat pump is operated at a low load when the water level of the water supply tank is lower than the first water level (H1), and the switching water level (H1 ′ lower than the first water level). When the temperature is lower than), the heat pump is operated while performing a high load operation, and when the temperature is higher than the second water level (H2) higher than the first water level, the heat pump is stopped. system. The heat pump can be switched between a low load operation, a medium load operation with a higher output than this, and a high load operation with a higher output than this,
The water supply to the water supply tank via the water supply path is performed while operating the heat pump at a low load when the water level of the water supply tank is lower than the first water level, and is lower than the first water level but higher than the switching water level. 4. The feed water heating system according to claim 3, wherein the heat pump is operated while operating at a medium load when the water level is below, and the heat pump is operated at a high load when the water level is below the switching water level.

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