JP2006138513A - Heat pump type hot water supply heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve hot water storing efficiency of a device as a whole by reducing a pressure increase at the time when a volume of the water is expanded because of temperature raise without increasing costs. <P>SOLUTION: In the hot water storing operation of this hot water supply heating device, a volume of water is expanded by about 3%, for example, in a process of heating the water from 20°C to 85°C. An over pressure relief valve 63 is opened at determined 190 kPa (about 1.9 kgf/cm<SP>2</SP>) by the expansion to discharge the hot water in the hot water storage tank 40 to the outside of the device through an overflow pipe 62. In this time, a temperature detecting sensor 64 detects 50°C or more, a control device S2 receiving detection output judges that overflow motion is performed by opening the over pressure relief valve 63. Here the control device S2 controls an opening and closing valve 59 for refill to be opened for a time when a timer counts, for example, 10 seconds, to discharge a small amount of water of low temperature in the hot water storage tank 40 to an expansion tank 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a heat pump type hot water heater / heater using a refrigerant such as HFC or CO ₂ . Specifically, hot water for hot water storage and heating is created by a heat pump unit, and when a pressure higher than a certain pressure is applied to the hot water storage tank, an overpressure relief valve is opened to open the hot water storage tank via the overflow pipe. The present invention relates to a heat pump type hot water heater / heater that discharges high temperature water to the outside.

  In this type of conventional heat pump hot water supply and heating system, low temperature water at the bottom of the hot water storage tank is sent to the heat pump unit, and hot water obtained by heat exchange is returned to the top of the hot water storage tank to store and store hot water. A technique for using water for hot water supply or a bath is known (see, for example, Patent Document 1).

The hot water storage circuit is a semi-enclosed circuit. When the water temperature rises, the volume expands and the water pressure in the circuit rises. Generally, the overpressure relief valve installed at the top of the hot water storage tank overflows the volume expansion. The water is discharged out of the tank unit.
JP 2004-218912 A

  Therefore, since a small amount of high temperature water is discharged as overflow water from the upper part of the hot water storage tank during the hot water storage operation, a part of the high temperature water obtained by the heat pump unit is discharged, which is useless. In order to increase the hot water storage efficiency of the entire apparatus, it is effective to cover the overflow water with low-temperature water below the hot water storage tank. For this reason, it is conceivable to newly provide an overflow pipe with a valve at the lower part of the hot water storage tank. However, the addition of parts causes a cost increase.

  Therefore, an object of the present invention is to improve the hot water storage efficiency of the entire apparatus by performing pressure relief when the volume expands due to high temperature of the water during a hot water storage operation without increasing the cost.

  For this reason, the first invention is to make hot water for hot water storage and heating by a heat pump unit, and when a pressure higher than a certain pressure is applied to the hot water storage tank, an overpressure relief valve is opened and this is connected via an overflow pipe. In a heat pump type hot water heater / heater configured to discharge hot water in a hot water storage tank to the outside, a temperature detection sensor that detects a temperature of the hot water flowing in the overflow pipe, and the hot water storage when the temperature detection sensor detects a predetermined temperature or more An on-off valve that discharges hot water at a temperature lower than the hot water in the tank to the outside of the hot water storage tank, a timer that keeps time from when the on-off valve is opened, and a control that closes the on-off valve when this timer times out And a control device for performing the operation.

  According to a second aspect of the present invention, hot water for hot water storage and heating is made by a heat pump unit, and when a pressure higher than a certain pressure is applied to the hot water storage tank, an overpressure relief valve is opened to cause the hot water storage tank to pass through the overflow pipe. In the heat pump type hot water supply and heating device that discharges the high temperature water inside, a temperature detection sensor that detects the temperature of the hot water flowing in the overflow pipe, and when the water level in the expansion tank becomes below a predetermined level, it opens. A replenishing on-off valve that is replenished and is opened to discharge hot water at a temperature lower than the hot water in the hot water storage tank from the hot water storage tank into the expansion tank when the temperature detection sensor detects a predetermined temperature or higher; A timer that counts when the replenishing on / off valve is opened, and controls to close the on / off valve when the timer counts a predetermined time. Characterized by providing a control device.

  According to a third aspect of the present invention, a compressor, a parallel circuit of a first water refrigerant heat exchanger for heating and a second water refrigerant heat exchanger for hot water storage, each connected with a pressure reducing device, and an air heat exchanger are sequentially annular The first hot water that circulates the hot water by the operation of the first circulation pump between the heat pump unit having a refrigerant circuit connected thereto, the expansion tank, the first water refrigerant heat exchanger, the floor heating panel, and the bathroom heating device. In a heat pump type hot water supply and heating apparatus, comprising a circulation path and a tank unit having a second hot water circulation path for circulating hot water between the second water refrigerant heat exchanger and the hot water storage tank by a second circulation pump. When the above pressure is applied to the hot water storage tank, an overpressure relief valve opens to discharge the hot water in the hot water tank to the outside, and a temperature for detecting the temperature of the hot water flowing in the overflow pipe. A temperature detection sensor and a valve that opens and replenishes when the water level in the expansion tank becomes a predetermined level or lower, and when the temperature detection sensor detects a predetermined temperature or higher, the temperature is lower than the hot water in the hot water storage tank. A replenishing on-off valve that opens to discharge the warm water from the hot water storage tank into the expansion tank, a timer that counts when the replenishing on-off valve is opened, and closes the on-off valve when the timer counts a predetermined time And a control device for controlling.

  According to a fourth aspect of the present invention, hot water for hot water storage and heating is made by a heat pump unit, and when a pressure higher than a predetermined pressure is applied to the hot water storage tank, an overpressure relief valve opens to cause the hot water storage tank to pass through an overflow pipe. In a heat pump type hot water supply and heating device that discharges high temperature water to the outside, a pressure sensor provided in a water supply circuit to the hot water storage tank, and a high temperature in the hot water storage tank when the pressure sensor detects a predetermined pressure or more An on-off valve that discharges hot water having a temperature lower than water to the outside of the hot water storage tank, a timer that counts when the on-off valve is opened, and a control device that controls the on-off valve to close when the timer counts a predetermined time; Is provided.

  According to a fifth aspect of the present invention, hot water for hot water storage and heating is made by a heat pump unit, and when a pressure higher than a predetermined pressure is applied to the hot water storage tank, an overpressure relief valve opens to cause the hot water storage tank to pass through the overflow pipe. In the heat pump hot water supply and heating device that discharges the high-temperature water inside, the pressure sensor provided in the water supply circuit to the hot water storage tank and replenished when the water level in the expansion tank falls below a predetermined level A replenishing on-off valve that opens to discharge hot water at a temperature lower than the high-temperature water in the hot water storage tank from the hot water storage tank into the expansion tank when the pressure sensor detects a predetermined pressure or higher. A timer that counts when the on-off valve is opened, and a control device that controls the on-off valve to close when the timer counts a predetermined time. The features.

  In a sixth aspect of the present invention, a compressor, a parallel circuit of a first water refrigerant heat exchanger for heating and a second water refrigerant heat exchanger for hot water storage, each connected to a decompression device, and an air heat exchanger are sequentially annularized. The first hot water that circulates the hot water by the operation of the first circulation pump between the heat pump unit having a refrigerant circuit connected thereto, the expansion tank, the first water refrigerant heat exchanger, the floor heating panel, and the bathroom heating device. In a heat pump type hot water supply and heating apparatus, comprising a circulation path and a tank unit having a second hot water circulation path for circulating hot water between the second water refrigerant heat exchanger and the hot water storage tank by a second circulation pump. When the above pressure is applied to the hot water storage tank, an overpressure relief valve opens to discharge the hot water in the hot water storage tank to the outside, a pressure sensor provided in the water supply circuit to the hot water storage tank, A valve for opening and replenishing when the water level in the expansion tank becomes lower than a predetermined level, and when the pressure sensor detects a predetermined pressure or higher, hot water having a temperature lower than the high temperature water in the hot water storage tank is supplied from the hot water storage tank. A replenishing on-off valve that opens to be discharged into the expansion tank, a timer that counts when the replenishing on-off valve is opened, and a control device that controls the on-off valve to close when the timer counts a predetermined time; Is provided.

  According to a seventh aspect of the present invention, hot water for hot water storage and heating is made by a heat pump unit, and when a pressure higher than a certain pressure is applied to the hot water storage tank, an overpressure relief valve opens to cause the hot water storage tank to pass through the overflow pipe. In the heat pump type hot water supply and heating device that discharges the hot water in the outside to the outside, the on-off valve that can discharge the hot water having a temperature lower than the hot water in the hot water storage tank to the outside of the hot water storage tank, and the hot water storage operation is started And a control device that controls to open the on-off valve for a predetermined time every predetermined time.

  According to an eighth aspect of the present invention, hot water for hot water storage and heating is produced by a heat pump unit, and when a pressure higher than a certain pressure is applied to the hot water storage tank, an overpressure relief valve opens to cause the hot water storage tank to pass through the overflow pipe. In the heat pump hot water supply and heating device that discharges the high-temperature water inside, a valve for opening and replenishing when the water level in the expansion tank becomes lower than a predetermined level, from the high-temperature water in the hot water storage tank A replenishment on / off valve that opens to discharge low temperature hot water from the hot water storage tank into the expansion tank, and a control that controls the replenishment on / off valve to open only for a predetermined time every predetermined time after the hot water storage operation is started. An apparatus is provided.

  According to a ninth aspect of the invention, a compressor, a parallel circuit of a first water-refrigerant heat exchanger for heating and a second water-refrigerant heat exchanger for storing hot water, each connected to a decompression device, and an air heat exchanger are sequentially annularly arranged. The first hot water that circulates the hot water by the operation of the first circulation pump between the heat pump unit having a refrigerant circuit connected thereto, the expansion tank, the first water refrigerant heat exchanger, the floor heating panel, and the bathroom heating device. An expansion tank comprising: a heat pump hot water supply / heater apparatus comprising: a circulation path and a tank unit having a second hot water circulation path for circulating hot water between the second water refrigerant heat exchanger and the hot water storage tank by a second circulation pump. A valve for opening and replenishing when the water level in the tank becomes below a predetermined level, and opening to replenish hot water having a temperature lower than the hot water in the hot water storage tank from the hot water tank into the expansion tank A valve, And a controller for controlling the replenishment on-off valve to open only for a predetermined time every predetermined time after the hot water storage operation is started.

  According to the present invention, during hot water storage operation, pressure relief when the volume expands due to high temperature of water can be performed without increasing the cost, and the hot water storage efficiency of the entire apparatus can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram showing an overall system of a heat pump hot water supply / room heating system. In FIG. 1, A is a heat pump unit, B is a tank unit, C1 is a first hot water circulation path for hot water heating, C2 is a second hot water circulation path for hot water storage, and R is a refrigerant circuit built in the heat pump unit A. is there. In the refrigerant circuit R, a refrigerant such as HFC or CO ₂ can be used, but CO ₂ is used in the present embodiment.

  1 and 2 are floor heating panels provided in the first hot water circulation path C1, and 3 and 4 are floor heating remote controllers (hereinafter referred to as "floor heating remote controllers") provided corresponding to the floor heating panels 1 and 2. In the first hot water circulation path C1, the first and second heat pumps 5 and 6, a first circulation pump 7 such as a DC pump whose conveyance capacity can be adjusted, an expansion tank 8, and a first water refrigerant heat exchanger 9 for heating. The water flow path 9B and the bypass valve 11 provided in the bypass path 10 are provided.

The refrigerant circuit R includes a two-stage compression compressor 21 capable of adjusting the capacity of suction and compression of CO ₂ refrigerant into a high temperature and high pressure, a first opening / closing valve 22 for heating, and the first water refrigerant heat exchanger 9. Heat exchange between the refrigerant flow path 9A, the primary flow path 23A of the internal heat exchanger 23 and the first expansion valve (pressure reducing device) 24, the second open / close valve 25 for hot water storage, and the refrigerant and water. Air for performing heat exchange between the outside air and the refrigerant, and a parallel circuit of the second branch passage P2 including the refrigerant flow path 26A of the second water refrigerant heat exchanger 26 for hot water storage and the second expansion valve (decompression device) 27 to be stored. The heat exchanger 28, the secondary flow path 23 </ b> B of the internal heat exchanger 23, and the accumulator 29 are sequentially pipe-connected in a ring shape.

  The first hot water circuit C1 is provided with a thermistor 30 for detecting the temperature of hot water flowing out from the water flow path 9B of the first water refrigerant heat exchanger 9, and a fan coil 31 for bathroom heating. 33 is a bathroom heating remote controller (hereinafter referred to as “bathroom heating remote controller”), 34 is a thermal valve provided at the inlet of the fan coil 31, and 35 is one of hot water flowing out from the expansion tank 8 by the first circulation pump 7. The thermal valve 36 for supplying a part to the floor heating panels 1 and 2 is a thermistor 36 for detecting the temperature of hot water flowing into the floor heating panels 1 and 2.

  In the second hot water circulation path C <b> 2, the water flow path 26 </ b> B of the second water refrigerant heat exchanger 26 and the hot water storage tank 40 are annularly connected via a second circulation pump 41. Reference numeral 42 denotes a thermistor that detects the temperature of hot water flowing out from the water flow path 26B of the second water refrigerant heat exchanger 26.

  Between the upper part and the middle part of the hot water storage tank 40, a primary flow path 43A of the water heat exchanger 43 and a third circulation pump 45 for remedy are connected. A bathtub 47 is connected to the secondary flow path 43 </ b> B of the water heat exchanger 43 via a fourth circulation pump 46. Reference numeral 50 denotes a first mixing valve composed of an automatic fixed mixing valve (temperature is adjusted in advance) that mixes high-temperature water and medium-temperature water in the hot water storage tank 40 to obtain approximately 65 ° C. hot water. The tap water from the water supply pipe 53 via the valve (which cannot be electrically controlled) 52 and the hot water from the first mixing valve 50 are mixed to obtain, for example, 36 ° C. to 48 ° C. (or 60 ° C.) hot water via the hot water supply pipe 54. 55 is a second mixing valve that can supply hot water, and the tap water from the water supply pipe 53 via the pressure reducing valve 52 and the hot water from the first mixing valve 50 are mixed to form hot water of about 42 ° C. It is a 3 mixing valve. The second and third mixing valves 51 and 55 are electric variable mixing valves whose temperature is variable.

  The hot water produced by the third mixing valve 55 passes through the fourth circulation pump 46 which is stopped by opening the on-off valves 56, 57 and without passing through the fourth circulation pump 46. The hot water filling operation of the bathtub 47 is performed through the secondary flow path 43B. The water supply pipe 53 is branched and connected to the lower part of the hot water storage tank 40, the second mixing valve 51, and the third mixing valve 55, and is connected to the expansion tank 8 through a replenishment opening / closing valve 59. . That is, when the water level sensor 60 in the expansion tank 8 detects that the water level in the expansion tank 8 is below a certain level, the control device S2, which will be described later, controls to open the replenishment opening / closing valve 59, and the water supply from the water supply pipe 53 is controlled. It is the structure which supplies water.

  The hot water storage tank 40 has a capacity of, for example, 370 liters. The hot water storage tank 40 has hot water temperature detection sensors T1, T2, T3, T4, T5 and T6 spaced from the bottom to the top of the hot water storage tank 40. When the detected hot water temperature of each of the detection sensors is 55 ° C. or higher, the hot water of 55 ° C. or higher is stored from the upper end of the hot water storage tank 40 to the position, and the controller S2 determines that there is remaining hot water. . At this time, the detection sensor T1 is disposed at a position where the amount of remaining hot water is 300 liters, T2 is also 250 liters, T3 is 200 liters, T4 is 150 liters, T5 is 100 liters, and T6 is 50 liters. A hot water temperature detection sensor 61 detects the hot water temperature near the outlet of the second circulation pump 41.

  And the consumer signs a lighting contract according to the time with the electric power company, calculates the amount of water to be heated from the amount of hot water stored at a predetermined time and the time required to boil up the total amount at a predetermined time in the low-night time period when the fee is low, and the heating ends The hot water storage operation is started from the time calculated in reverse from the time in consideration of the necessary time, and is controlled by the control device S2 so as to stop as soon as the whole amount has been heated up (the detected temperature of the hot water temperature detection sensor 61 is 55 ° C. or higher). At the same time, the hot water storage operation is started when the remaining hot water volume is less than 100 liters, and the control device S2 controls to stop the hot water storage operation when the remaining hot water volume exceeds 150 liters.

  62 is an overflow pipe connected to the upper part of the hot water storage tank 40. When the temperature of the water becomes high, the volume expands and the water pressure in the water circuit rises, so this volume expansion is taken as overflow water outside the apparatus (outside the tank unit B). An overpressure relief valve 63 for discharging is provided. 64 is a temperature detection sensor that is disposed downstream of the overpressure relief valve 63 in the overflow pipe 62 and detects the temperature of hot water flowing in the overflow pipe 62. When the detection sensor 64 detects, for example, 50 ° C. or higher, The control device S2 determines that the overpressure relief valve 63 is open and an overflow operation is being performed.

The pressure reducing valve 52 disposed in the middle of the water supply pipe 53 is set so as to reduce the water supply pressure of tap water to 170 kPa (about 1.7 kgf / cm ² ). ) 63 is set to open at 190 kPa (about 1.9 kgf / cm ² ). When the water supply pressure is sufficient, the internal pressure of the hot water storage tank 40 is normally 170 kPa, and even if the pressure increases, it is always 190 kPa. Kept below.

  By manually opening the overpressure relief valve 63, initial water filling to the hot water storage tank 40 (air discharge from the overpressure relief valve 63) and draining from the hot water storage tank 40 (air from the overpressure relief valve 63) Inhalation) is possible.

  The heat pump unit A and the tank unit B are provided with control devices S1 and S2 each composed of a microcomputer or the like. The control devices S1 and S2 include floor heating remote controllers 3 and 4, a bath remote controller (hereinafter referred to as “bath remote controller”) 65 provided in the bathroom, and a kitchen remote controller (hereinafter referred to as “kitchen remote controller”) provided in the kitchen. 66, the operation and frequency control of the compressor 21 and the first to fourth circulation pumps 7 and 41 according to the operation signal and temperature signal from the fan coil 31 and the temperature signal of the thermistors 30, 36 and 42. , 45, 46, thermal control valves 5, 6, 35, opening and closing control of the first and second opening / closing valves 22, 25, opening control of the expansion valves 24, 27, etc. Will be explained.

<Hot water storage operation>
In late night hours when the price is low, calculate the amount of water to be heated from the amount of hot water stored at a predetermined time, and the time required to boil up the entire amount. Be started. Further, in other time zones, when the remaining hot water amount is less than 100 liters, that is, when the detection sensor T5 detects that the hot water temperature is less than 55 ° C., the hot water storage operation is started.

  That is, hot water is stored in the hot water storage tank 40 based on the detection output from the detection sensor, the control device S2 operates the second circulation pump 41, and in the second hot water circulation path C2, the hot water storage tank 40 → second circulation. Hot water for hot water supply flows in the order of the pump 41 → the water flow path 26 B of the second water refrigerant heat exchanger 26 → the hot water storage tank 40, and is stored in the hot water storage tank 40.

  In the heat pump unit A, the compressor 21 is operated by the control device S1 and the second opening / closing valve 25 is opened. In the refrigerant circuit R, the refrigerant flow path of the compressor 21 → the second opening / closing valve 25 → the second water refrigerant heat exchanger 26. The refrigerant flows in the order of 26A → second expansion valve 27 → air heat exchanger 28 → secondary flow path 23B of the internal heat exchanger 23 → accumulator 29 → compressor 21. At this time, since heating is not performed, the first on-off valve 22 and the first expansion valve 24 are closed. In addition, the refrigerant simply passes through the secondary flow path 23B of the internal heat exchanger 23, and does not affect others.

  The temperature of the hot water supplied to the hot water storage tank 40 is 85 ° C., but the control device S1 controls the frequency of the compressor 21 and the valve opening of the second expansion valve 27 so that the temperature detected by the thermistor 42 becomes this temperature. Control is performed.

In this hot water storage operation, for example, in the process where water at 20 ° C. becomes 85 ° C., the volume of water expands by about 3%, but this expansion causes the overpressure relief valve 63 to be set to 190 kPa (about 1.9 kgf). / Cm ² ), the hot water in the hot water storage tank 40 is discharged out of the apparatus (outside of the tank unit B) through the overflow pipe 62, but the efficiency is poor when draining the high temperature water. Therefore, when the temperature detection sensor 64 detects 50 ° C. or higher when the hot water is discharged to the outside of the apparatus through the overflow pipe 62, the control device S2 that has received the detection output determines that the overflow operation is being performed. .

  In this case, the control device S2 controls the replenishment opening / closing valve 59 so that it opens until the timer TM1 counts, for example, 10 seconds, and discharges a small amount of low-temperature water in the hot water storage tank 40 to the expansion tank 8. Thereby, the internal pressure of the hot water storage tank 40 can be reduced, and the drainage of high temperature water from the upper part of the hot water storage tank 40 can be stopped.

<Water supply operation, hot water filling operation and memorial operation>
The hot water stored in the hot water storage tank 40 is mixed with the medium hot water by the first mixing valve 50 to be heated to approximately 65 ° C., and then the tap water from the water supply pipe 53 through the pressure reducing valve 52 and the first mixing are mixed. The hot water from the valve 50 is mixed by the second mixing valve 51 to allow hot water supply to the kitchen or the like via the hot water supply pipe 54 as hot water of 36 ° C. to 48 ° C. (or 60 ° C.). When this hot water supply is performed, water is supplied from the water supply pipe 53 to the lower part of the hot water storage tank 40.

  Also, hot water of approximately 65 ° C. produced by mixing by the first mixing valve 50 and tap water from the water supply pipe 53 via the pressure reducing valve 52 are mixed by the third mixing valve 55 to be about 42 ° C. The warm water passes through the secondary flow path 43B of the water heat exchanger 43 through the fourth circulation pump 46 which is stopped and not through the fourth circulation pump 46 when the on-off valves 56 and 57 are opened. Thus, the hot water filling operation of the bathtub 47 is performed.

  In addition, the control device S2 operates the third and fourth circulation pumps 45 and 46 to exchange heat between the hot water in the hot water storage tank 40 and the hot water in the bathtub 47 in the water heat exchanger 43, and the hot water in the bathtub 47 A memorial can also be performed.

  When the boiling of the whole amount is completed in the midnight time zone (when the hot water temperature detection sensor 61 detects 55 ° C. or more), and when the remaining hot water amount is 150 liters or more in other time zones, that is, the detection sensor When T4 detects 55 ° C. or higher, the control devices S1 and S2 control so that the hot water storage operation is stopped.

<Simultaneous operation of heating and hot water storage>
In this case, the circulation path of the hot water for heating and the circulation path of the hot water for hot water storage are as described above. In the refrigerant circuit R, the compressor 21 → the first on-off valve 22 → the refrigerant flow path 9A of the first water refrigerant heat exchanger 9 → the primary flow path 23A of the internal heat exchanger 23 → the first expansion valve 24 → the air heat exchanger. The refrigerant flows in the order of 28 → secondary flow path 23B of the internal heat exchanger 23 → accumulator 29 → compressor 21 and the refrigerant flow path 26A of the compressor 21 → second on-off valve 25 → second water refrigerant heat exchanger 26. The refrigerant flows in the order of the second expansion valve 27, the air heat exchanger 28, the secondary flow path 23 B of the internal heat exchanger 23, the accumulator 29, and the compressor 21.

  Further, the control devices S1 and S2 perform frequency control of the compressor 21 and valve opening control of the first expansion valve 24 and the second expansion valve 27 so that the thermistors 30, 36, and 42 respectively have the target temperatures described above. Is called. Basically, by controlling the first and second expansion valves 24 and 27, the refrigerant is distributed to the first branch path (heating side) P1 and the second branch path P2 (hot water storage side) at a ratio of 1: 1. Even when simultaneous operation is performed, sufficient capacity can be obtained on the heating side and the hot water storage side.

<Floor heating operation>
When performing floor heating by the floor heating panel 1, the operation switch of the floor heating remote controller 3 attached to the wall surface of the room is turned on. Then, the control device S2 controls to open the corresponding thermal valve 5 and operates the first circulation pump 7. In the first hot water circulation path C1, the expansion tank 8 → the first circulation pump 7 → the first Hot water flows in the order of the water flow path 9B of the water-refrigerant heat exchanger 9 → the thermal valve 5 → the floor heating panel 1 → the expansion tank 8. The bypass pipe 10 takes time to open the thermal valve 5 and bypasses part of the hot water via the bypass valve 11 so that it can cope with the case where the thermal valve 5 is broken. A small amount of warm water flows.

  When the operation switch of the floor heating remote controller 3 is turned on, the control device S1 controls the compressor 21 of the heat pump unit A to operate and opens the first on-off valve 22 and the first expansion valve 24, In the refrigerant circuit R, the compressor 21 → the first on-off valve 22 → the refrigerant flow path 9A of the first water / refrigerant heat exchanger 9 for heating → the primary flow path 23A of the internal heat exchanger 23 → the first expansion valve 24 → air The refrigerant flows in the order of the heat exchanger 28 → the secondary flow path 23B of the internal heat exchanger 23 → the accumulator 29 → the compressor 21. At this time, since hot water is not stored, the second on-off valve 25 and the second expansion valve 27 are closed.

  The temperature of the hot water supplied to the floor heating panel 1 is 60 to 70 ° C., but the frequency control of the compressor 21 and the opening of the first expansion valve 24 are performed so that the temperature of the hot water detected by the thermistor 30 becomes this temperature. The degree control is performed by the control device S1. Further, in the floor heating control, a room temperature thermistor (not shown) mounted on the floor heating remote controller 3 detects the room temperature, and controls the opening and closing of the thermal valve 5 based on the deviation between the set temperature and the room temperature. This is done by controlling the amount of hot water to the control device S2.

  When floor heating is simultaneously performed by the floor heating panel 2, the operation valve of the floor heating remote controller 4 is turned on to similarly control the opening and closing of the thermal valve 6 so that hot water is simultaneously supplied to the floor heating panels 1 and 2. In addition, by individually controlling the amount of hot water to the floor heating panels 1 and 2, it is possible to individually control the floor heating.

<Bathroom heating operation>
When bathroom heating is performed by the fan coil 31, an operation switch (not shown) of the bathroom heating remote controller 33 is turned on. Then, the thermal valve 34 at the inlet of the fan coil 31 opens, and the control device S2 operates the first circulation pump 7. Accordingly, in the first hot water circulation path C1, hot water flows in the order of the expansion tank 8 → the first circulation pump 7 → the water flow path 9B of the first water refrigerant heat exchanger 9 → the thermal valve 34 → the fan coil 31 → the expansion tank 8. . The bypass pipe 10 bypasses part of the hot water via the bypass valve 11 so that it takes time to open the thermal valve 34 and can cope with the case where the thermal valve 34 is broken. There is a small amount of warm water.

  At this time, the operation of the heat pump unit A and the refrigerant circulation are the same as in the floor heating operation, and no hot water is stored, so the second on-off valve 25 and the second expansion valve 27 are closed.

  The temperature of the hot water supplied to the fan coil 31 is 80 ° C., and the hot water control for that is the same as in the floor heating operation. In addition, bathroom heating control based on a command from the bathroom heating remote controller 33 detects the room temperature by a room temperature thermistor (not shown) mounted on the fan coil 31, controls the fan rotation speed, and controls the opening and closing of the thermal valve 34. Is done.

<Simultaneous operation of floor heating and bathroom heating>
When floor heating by the floor heating panels 1 and 2 and bathroom heating by the fan coil 31 are performed simultaneously, the operation switches of the respective remote controllers 3, 4 and 33 are turned on. Then, the thermal valve 34 at the inlet of the fan coil 31 is opened, and the control device S2 controls the thermal valves 5 and 6 to open, operates the first circulation pump 7, and expands in the first hot water circuit C1. Hot water flows in the order of tank 8 → first circulation pump 7 → water flow path 9B of first water refrigerant heat exchanger 9 → thermal valves 5, 6 → floor heating panels 1 and 2 → expansion tank 8, and expansion tank 8 → Hot water flows in the order of the first circulation pump 7 → the water flow path 9B of the first water / refrigerant heat exchanger 9 → the thermal valve 34 → the fan coil 31 → the expansion tank 8.

  The bypass pipe 10 bypasses a part of the hot water so that it takes time to open the thermal valves 5, 6, 34, and can cope with even when the thermal valves 5, 6, 34 are out of order. Bypassing through the valve 11, a small amount of warm water flows.

  The operation of the heat pump unit A and the refrigerant circulation are the same as in the floor heating operation or bathroom heating operation, and hot water is not stored, so the second on-off valve 25 and the second expansion valve 27 are closed.

  Next, in the first embodiment, a temperature detection sensor 64 that detects the temperature of hot water flowing in the overflow pipe 62 is provided, and when the temperature detection sensor 64 detects, for example, 50 ° C. or more, the control device S2 performs overpressure. In the second embodiment, the relief valve 63 is open and it is determined that the overflow operation is performed. In the second embodiment, the pressure sensor 70 is provided in the water supply circuit to the hot water storage tank 40 instead of the temperature detection sensor 64. This is an example of determining that an overflow operation is being performed by the pressure sensor 70 and the control device S2, and will be described in detail below.

Water is supplied to the lower part of the hot water storage tank 40 through a water supply pipe 53. A pressure sensor 70 is provided in the vicinity of the hot water storage tank 40 of the water supply pipe 53 as shown by a dotted line in FIG. As described above, in the hot water storage operation, the volume of water expands in the process of increasing the temperature of the water to become hot water. By this expansion, the overpressure relief valve 63 is set to 190 kPa (about 1.9 kgf / cm). ² ) The hot water in the hot water storage tank 40 is discharged to the outside of the apparatus (outside the tank unit B) through the overflow pipe 62 which is opened in ² ). At this time, since the pressure sensor 70 detects a pressure equal to or higher than a predetermined value, the control device S2 receiving the detection output determines that an overflow operation is being performed.

  Then, the control device S2 controls the replenishment opening / closing valve 59 to open until, for example, the timer TM1 counts 10 seconds, and discharges a small amount of low-temperature water in the hot water storage tank 40 to the expansion tank 8. Thereby, the internal pressure of the hot water storage tank 40 can be reduced, and the drainage of high temperature water from the upper part of the hot water storage tank 40 can be stopped.

  Next, a third embodiment in which the temperature detection sensor 64 and the pressure sensor 70 are not provided will be described. First, as described above, in the low-night time zone when the charge is low, calculate the amount of boiling from the amount of hot water stored at a predetermined time, and the time required to boil up the whole amount, and consider the necessary time from the boiling end time. Hot water storage operation is started from the time calculated backward. In other time zones, when the remaining hot water amount in the hot water storage tank 40 is less than 100 liters, that is, when the detection sensor T5 detects that the hot water temperature is less than 55 ° C., the hot water storage operation is started. For example, every 10 minutes after the hot water storage operation is started, the controller S2 controls the replenishment opening / closing valve 59 to open for 10 seconds, for example, and discharges the low temperature water in the hot water storage tank 40.

  These times are measured by a timer (not shown), and the internal pressure of the hot water storage tank 40 can be periodically reduced, and discharge of hot hot water from the upper part of the hot water storage tank 40 can be prevented as much as possible without increasing the cost.

  Conventionally, it has dealt with the volume expansion of the water in the hot water storage tank by discharging the hot water, but it was useless because the hot water was discharged. According to this, since it is possible to reduce the discharge of high temperature water as much as possible, the hot water storage efficiency of the entire apparatus can be improved. Moreover, the low-temperature water in the hot water storage tank 40 is transferred from the hot water storage tank 40 to the hot water storage tank 40 by using the replenishment opening / closing valve 59 already installed to open and replenish when the water level in the expansion tank 8 becomes a predetermined level or less. Since it is the structure opened so that it may discharge | emit in the expansion tank 8, it can carry out without raising a cost.

  Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the various alternatives and modifications described above are within the scope of the present invention. Or a modification is included.

It is a whole system diagram of a heat pump type hot water supply and heating device. It is a control block diagram.

Explanation of symbols

DESCRIPTION OF SYMBOLS 8 Expansion tank 21 Compressor 9 1st water-refrigerant heat exchanger 22 1st on-off valve 23 Internal heat exchanger 24 1st expansion valve 25 2nd on-off valve 26 2nd water-refrigerant heat exchanger 27 2nd expansion valve 28 Air heat Exchanger 29 Accumulator 59 Replenishment open / close valve 62 Overflow pipe 63 Overpressure relief valve 64 Temperature detection sensor 70 Pressure sensor A Heat pump unit B Tank unit C1 First hot water circulation path C2 for hot water heating C2 Second hot water circulation path for hot water storage R Refrigerant circuit S2 controller TM1 timer

Claims (9)

  Hot water for hot water storage and heating is created by a heat pump unit. When a pressure higher than a certain level is applied to the hot water storage tank, the overpressure relief valve opens and the hot water in the hot water storage tank is discharged to the outside via an overflow pipe. In the heat pump hot water supply and heating device that discharges to the temperature pump, a temperature detection sensor that detects the temperature of the hot water flowing in the overflow pipe, and a temperature lower than the high-temperature water in the hot water storage tank when the temperature detection sensor detects a predetermined temperature or higher Provided an on-off valve that discharges hot water from the hot water storage tank, a timer that counts when the on-off valve is opened, and a control device that controls the on-off valve to close when the timer counts a predetermined time. A heat pump type hot water supply and heating device characterized by the above.   Hot water for hot water storage and heating is created by a heat pump unit. When a pressure higher than a certain level is applied to the hot water storage tank, the overpressure relief valve opens and the hot water in the hot water storage tank is discharged to the outside via an overflow pipe. In the heat pump type hot water heater / heater configured to discharge to the temperature pump, a temperature detection sensor for detecting the temperature of the hot water flowing in the overflow pipe, and a valve for opening and replenishing when the water level in the expansion tank falls below a predetermined level When the temperature detection sensor detects a predetermined temperature or more, a replenishing on-off valve that opens to discharge hot water having a temperature lower than the high-temperature water in the hot water storage tank from the hot water storage tank to the expansion tank, and the replenishing on-off valve A timer that counts from the time of opening and a control device that controls the on-off valve to close when the timer counts a predetermined time are provided. Heat pump water heater heating system, characterized in that the.   A compressor, a parallel circuit of a first water refrigerant heat exchanger for heating and a second water refrigerant heat exchanger for hot water storage, each connected to a decompressor, and a refrigerant circuit formed by sequentially connecting an air heat exchanger in an annular shape A heat pump unit comprising: an expansion tank; a first hot water circulation path for circulating hot water between the first water refrigerant heat exchanger, a floor heating panel and a bathroom heating device by operating a first circulation pump; and the second In a heat pump type hot water supply and heating device including a tank unit having a second hot water circulation path for circulating hot water by a second circulation pump between a water refrigerant heat exchanger and a hot water storage tank, a pressure higher than a certain pressure is An overflow pipe that discharges high-temperature water in the hot water storage tank to the outside by opening an overpressure relief valve when applied to the tank, and a temperature detection sensor that detects the temperature of the hot water flowing in the overflow pipe; A valve that opens and replenishes when the water level in the expansion tank becomes lower than a predetermined level, and stores hot water having a temperature lower than the hot water in the hot water storage tank when the temperature detection sensor detects a predetermined temperature or higher. A replenishing on-off valve that opens to discharge from the tank into the expansion tank, a timer that counts when the replenishing on-off valve opens, and a control that controls the on-off valve to close when the timer counts a predetermined time A heat pump type hot water supply and heating device, characterized in that a device is provided.   Hot water for hot water storage and heating is created by a heat pump unit. When a pressure higher than a certain level is applied to the hot water storage tank, the overpressure relief valve opens and the hot water in the hot water storage tank is discharged to the outside via an overflow pipe. In a heat pump type hot water supply and heating device that discharges to a hot water tank, a pressure sensor provided in a water supply circuit to the hot water storage tank, and hot water having a temperature lower than the high temperature water in the hot water storage tank when the pressure sensor detects a predetermined pressure or more An on-off valve that discharges the hot water outside the hot water storage tank, a timer that counts when the on-off valve is opened, and a controller that controls the on-off valve to close when the timer counts a predetermined time. Heat pump type hot water supply and heating system.   Hot water for hot water storage and heating is created by a heat pump unit. When a pressure higher than a certain level is applied to the hot water storage tank, the overpressure relief valve opens and the hot water in the hot water storage tank is discharged to the outside via an overflow pipe. In the heat pump type hot water supply and heating device that discharges to the pressure tank, there are a pressure sensor provided in the water supply circuit to the hot water storage tank, and a valve that opens and replenishes when the water level in the expansion tank falls below a predetermined level. When the pressure sensor detects a predetermined pressure or more, a replenishing on-off valve that opens to discharge hot water at a temperature lower than the hot water in the hot water storage tank from the hot water storage tank to the expansion tank, and the replenishing on-off valve opens. A timer that counts from time to time and a control device that controls to close the on-off valve when the timer counts a predetermined time are provided. Toponpu type hot-water supply heating system.   A compressor, a parallel circuit of a first water refrigerant heat exchanger for heating and a second water refrigerant heat exchanger for hot water storage, each connected to a decompressor, and a refrigerant circuit formed by sequentially connecting an air heat exchanger in an annular shape A heat pump unit comprising: an expansion tank; a first hot water circulation path for circulating hot water between the first water refrigerant heat exchanger, a floor heating panel and a bathroom heating device by operating a first circulation pump; and the second In a heat pump type hot water supply and heating device including a tank unit having a second hot water circulation path for circulating hot water by a second circulation pump between a water refrigerant heat exchanger and a hot water storage tank, a pressure higher than a certain pressure is An overflow pipe that discharges high-temperature water in the hot water tank to the outside by opening an overpressure relief valve when applied to the tank, a pressure sensor provided in a water supply circuit to the hot water tank, and the expansion tank A valve for opening and replenishing when the water level in the tank becomes lower than a predetermined level, and when the pressure sensor detects a predetermined pressure or higher, hot water having a temperature lower than the high temperature water in the hot water storage tank is transferred from the hot water storage tank to the expansion tank. A replenishing on-off valve that is opened to be discharged into the interior, a timer that counts when the replenishing on-off valve is opened, and a control device that controls the on-off valve to be closed when the timer counts a predetermined time. A heat pump type hot water supply and heating device characterized by that.   Hot water for hot water storage and heating is created by a heat pump unit, and when a pressure higher than a certain pressure is applied to the hot water storage tank, the overpressure relief valve opens and the hot water in the hot water storage tank is externally discharged via an overflow pipe. In the heat pump type hot water supply and heating device that discharges to the hot water storage device, an on-off valve that can discharge hot water having a temperature lower than the hot water in the hot water storage tank to the outside of the hot water storage tank, and a predetermined time every predetermined time after the hot water storage operation is started And a control device that controls to open the on-off valve only.   Hot water for hot water storage and heating is created by a heat pump unit, and when a pressure higher than a certain pressure is applied to the hot water storage tank, the overpressure relief valve opens and the hot water in the hot water storage tank is externally discharged via an overflow pipe. In the heat pump type hot water supply and heating device that is discharged to the valve, it is a valve for opening and replenishing when the water level in the expansion tank falls below a predetermined level, and hot water having a temperature lower than that of the hot water in the hot water storage tank is A replenishing on-off valve that opens to discharge from the hot water storage tank into the expansion tank, and a control device that controls the replenishing on-off valve to open for a predetermined time every predetermined time after the hot water storage operation is started are provided. A heat pump type hot water supply and heating device characterized by the above.   A compressor, a parallel circuit of a first water refrigerant heat exchanger for heating and a second water refrigerant heat exchanger for hot water storage, each connected to a decompressor, and a refrigerant circuit formed by sequentially connecting an air heat exchanger in an annular shape A heat pump unit comprising: an expansion tank; a first hot water circulation path for circulating hot water between the first water refrigerant heat exchanger, a floor heating panel and a bathroom heating device by operating a first circulation pump; and the second In a heat pump hot water supply and heating device including a tank unit having a second hot water circulation path for circulating hot water between a water-refrigerant heat exchanger and a hot water storage tank by a second circulation pump, the water level in the expansion tank is below a predetermined level A replenishing on-off valve that opens to replenish hot water at a temperature lower than the hot water in the hot water storage tank from the hot water tank into the expansion tank, and a hot water storage operation. start And a control device that controls the replenishment on-off valve to open for a predetermined time every predetermined time.

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