JP2020020540A - Hot-water heating apparatus - Google Patents

Abstract

To prevent a cold wind from being blown out of a fan convector 10 during a defrosting operation.SOLUTION: A heat source unit 1 comprises a heat source control part 36 which controls operation of the heat source unit, and reception means. An indoor unit 10 comprises an indoor control part 37 which controls an indoor fan 12 in accordance with a temperature detected by a cold wind preventive thermistor 15, and transmission means. A control line is also provided for transmitting an output signal of the indoor unit to the heat source unit only in one direction. During a heating operation, the heat source control part actuates the indoor fan when the temperature detected by the cold wind preventive thermistor is equal to or higher than a predetermined temperature, and freezing of an evaporator or coolant piping is detected by an outdoor heat exchanging sensor 23. The heat source control part includes defrosting operation means 42 by which when a defrosting condition is established, a defrosting preparation operation in which a compressor is stopped or reduced to a low rotation speed and operation of a circulation pump is continued is implemented for a predetermined time, the circulation pump is stopped after the end of the defrosting preparation operation and the compressor is operated at a predetermined rotation speed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hot water heating device that includes a heat source unit that supplies hot water, and controls the heat source unit based on a signal output in one direction from an indoor unit to the heat source unit.

  Conventionally, a heating-only heat source device for generating hot water, a main remote control having an operation switch for instructing start or stop of the operation of the heat source device and a hot water temperature setting switch for setting hot water temperature, and the like, are provided. There is a hot water supply system that circulates the heated water between a heating indoor unit and a heat source unit installed in the room and radiates heat by the indoor unit to heat the room. In the supply system, the communication between the indoor unit and the heat source unit is performed by a control line (E) that connects the indoor unit and the heat source unit and transmits only a signal indicating the presence or absence of an operation request output from the indoor unit to the heat source unit in one direction. -Con communication line), and the operation start or stop of the heat source unit can be controlled by a signal output from the indoor unit. (For example, refer to Patent Document 1.) Also, in order to melt the frost adhering to the evaporator by the heating operation and perform an efficient operation, a hot water heating system having a function of a defrosting operation of periodically heating the evaporator is provided. There is. (For example, see Patent Document 2)

JP 2004-183941 A JP-A-2006-200302

  By the way, in the above-mentioned hot water heating system, in the normal defrosting operation, the refrigeration circuit is switched to temporarily heat the evaporator, and the circulation pump is stopped so that the indoor heat does not flow back to the refrigeration circuit. When the heat source unit and the indoor unit are connected by a terminal control line of one-way communication and control the start or stop of the heat source unit by a signal output from the indoor unit, the indoor unit changes the operating state of the heat source unit. Since it cannot be known, the indoor unit cannot know that the heat source unit is performing the defrosting operation. Therefore, there is a problem that the indoor fan gives a user uncomfortable feeling by continuously blowing out the warm air having a relatively low temperature until the cold air prevention thermistor drops to a predetermined temperature.

  Further, if the communication between the heat source unit and the indoor unit is two-way communication, the above-described problem does not occur by immediately stopping the indoor fan when the heat source unit starts the defrosting operation. Two-way communication not only raises costs, but also controls the two-way communication only between the own-brand heat source unit and the corresponding own-brand indoor unit. The indoor unit cannot be used in combination with the heat source unit of the own brand, and there is a problem that versatility is lacking.

  The present invention, in order to solve the above problems, in the heat source device, a refrigeration circuit in which a compressor, a condenser, an expansion valve, and an evaporator communicate with a refrigerant pipe, an outdoor heat exchange sensor that detects the temperature of the evaporator, The condenser comprises a water-refrigerant heat exchanger for performing heat exchange between the refrigeration circuit and the hot water circuit, and flows into the indoor heat exchanger, the indoor fan, and the indoor heat exchanger in the indoor unit. A hot AC input sensor for detecting the temperature of hot water, the hot water circuit is formed by connecting the water-refrigerant heat exchanger, the indoor heat exchanger, and a circulation pump with hot water piping, A heat source control unit that controls the operation of the heat source unit, and a receiving unit that receives an operation request signal output from the indoor unit, wherein the indoor unit has a temperature detected by the thermal AC input sensor. An indoor control unit that controls the operation of the indoor fan, And a terminal control line for transmitting an output signal from the transmission unit of the indoor unit to the reception unit of the heat source unit only in one direction, during a heating operation. The indoor control unit operates the indoor fan when the temperature detected by the thermal AC input sensor is equal to or higher than a predetermined temperature, and the heat source control unit operates the compressor, the expansion valve, and the circulation pump. When the outdoor heat exchange sensor detects a predetermined temperature and the defrosting condition is satisfied, the compressor is stopped or the compressor is stopped down to a low rotation speed, and the circulation pump is frozen. A defrosting preparation operation is performed in which the operation is continued to reduce the hot water temperature detected by the hot AC input sensor to less than the predetermined temperature, and after the defrosting preparation operation is completed, the circulation pump is stopped and the compressor is rotated at a predetermined speed. number And to include the defrosting operation means for operating.

  Before the start of the defrosting operation, by performing a defrosting preparation operation in which the operation of the circulation pump is continued for a predetermined time, the cold water after stopping the compressor is circulated to the hot water circuit, and the heat AC input sensor is cooled early, By stopping the indoor fan early, it is possible to prevent the indoor unit from blowing the cold air for a long time to make the user uncomfortable.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the hot water heating apparatus of one Embodiment of this invention. FIG. FIG.

Next, a hot water heating apparatus according to an embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a heat pump unit serving as a heat pump type heat source device that generates hot water. The heat pump unit 1 includes a compressor 2, a condenser 3, an expansion valve 4, and an evaporator 5, each of which has a variable capacity for compressing a refrigerant. A refrigeration circuit 7 is formed by being connected in a ring by a pipe 6. In addition, as the refrigerant circulating in the refrigeration circuit 7, any refrigerant such as an HFC refrigerant and a carbon dioxide refrigerant can be used.

  The condenser 3 comprises a first water-refrigerant heat exchanger 9 for exchanging heat between the refrigeration circuit 7 and the hot water circuit 8. An indoor unit 10 such as a fan convector has a fin tube type indoor heat exchanger 11, a cross flow type indoor fan 12, a thermal valve (not shown), and an indoor temperature sensor (not shown) for detecting the indoor temperature. (Not shown), etc., and heating is performed by sucking indoor air by the rotation of the indoor fan 12 and blowing out the air heated by the indoor heat exchanger 11 into the room. The indoor heat exchanger 11 is annularly connected to the first water-refrigerant heat exchanger 9 and the hot water pipe 13. In the heat source unit 1, the upstream-side hot water circuit 8 of the first water-refrigerant heat exchanger 9 has an indoor unit-side circulation pump 14. In the indoor unit 10, the hot water pipe 13 has a cold air prevention thermistor 15 as a heat exchange input sensor on the upstream side of the indoor heat exchanger 11, and detects the temperature of the hot water flowing into the indoor heat exchanger 11, When the temperature is lower than a predetermined temperature (approximately 40 ° C.), the rotation of the indoor fan 12 is stopped, and the relatively low temperature air blows from the indoor unit 10, so that the user may feel cold and feel uncomfortable. To prevent.

  The evaporator 5 comprises a second water-refrigerant heat exchanger 17 for exchanging heat between the refrigeration circuit 7 and the heat source side circulation circuit 16. Reference numeral 18 denotes an underground heat exchanger installed underground as a heat source for heating the refrigerant flowing through the second water-refrigerant heat exchanger 17, and the second water-refrigerant heat exchanger 17 and the underground heat exchanger 18 The heat source side pipe 19 is annularly connected to form the heat source side circulation circuit 16, and the heat source side pipe 19 circulates an antifreeze liquid to which the heat medium side ethylene glycol, propylene glycol, or the like is added to the heat source side circulation circuit 16. A heat source side circulating pump 20 for changing the rotation speed to be rotated and a heat source side cistern 21 for storing antifreeze and adjusting the pressure of the heat source side circulating circuit 16 are provided.

  Reference numeral 22 denotes a discharge temperature sensor for detecting the temperature of the refrigerant discharged from the compressor 2, and reference numeral 23 denotes outdoor heat for detecting the temperature of the refrigerant in a gas-liquid mixed state from the expansion valve 4 to the evaporator 5 during the heating operation. By detecting the temperature of the outdoor heat exchange sensor 23 with the exchange sensor, it is known that frost or ice has been generated in the evaporator 5 or the refrigerant pipe 6 near the evaporator 5 when the heating operation is continued in a state where the outside air temperature is low. be able to.

  Reference numeral 24 denotes a return temperature sensor provided on the upstream side of the indoor unit-side circulation pump 14 of the hot water pipe 13. The return temperature sensor 24 changes the rotation of the compressor 2 in accordance with the return hot water temperature detected by the return temperature sensor 24, and To adjust. Reference numeral 25 denotes an indoor cistern for storing hot water and adjusting the pressure of the hot water circuit 8, and stores water or antifreeze to adjust the pressure of the hot water circuit 8.

  Reference numeral 26 denotes a wireless terminal remote controller for remotely controlling the indoor unit 10. The terminal remote controller 26 includes an operation switch 27 for causing the indoor unit 10 to perform a heating operation, a stop switch 28 for stopping the operation of the indoor unit 10, and an indoor temperature. And a display unit 30 for displaying a set temperature and an operation state of the room.

  Reference numeral 31 denotes a main remote controller installed in a room such as a living room. The main remote controller 31 supplies power to the electric system of the main remote controller 31 and the heat pump unit 1 by pressing to put the heat pump unit 1 in a standby state, and a heat pump unit. 1, an operation switch 33 for starting the operation of the indoor unit 10, a supply water temperature setting switch 34 for setting the temperature of hot water or cold water supplied to the indoor unit 10, and a set temperature of the hot water supplied to the indoor unit 10 and an operation state of the heat pump unit 1. And a display unit 35 for displaying.

  36 receives signals from various sensors in the heat pump unit 1, signals output from the indoor control unit 37 of the indoor unit 10, and signals from the main remote controller 31, and receives the signals from the compressor 2, the expansion valve 4, and the heat source side circulation pump 20. The heat source control unit controls the driving of the load-side circulation pump 14. The heat source control unit 36 mainly includes a microcomputer (not shown) and includes a receiving circuit 38 and the like. The main remote controller 31 is connected by a bidirectional communication line 39 and exchanges signals with each other. Between the heat source control unit 36 and the indoor control unit 37, there is a signal indicating whether or not there is an operation request from the indoor control unit 37. They are connected by a terminal control line 40 (E-con communication line) that transmits only one direction. The microcomputer and the signal receiving circuit 38 function as a receiving unit that receives a signal output from the indoor unit 10. Further, the indoor control unit 37 includes a transmission unit mainly including a microcomputer (not shown) and including a transmission circuit 41 and the like. In addition, the E-con communication is a common specification of major gas companies and heating equipment manufacturers, etc., and means communication for starting and stopping the operation of the heat source unit by a one-way signal output from a terminal. The -con communication line can be used at low cost and has high versatility. Reference numeral 42 denotes a defrosting operation means provided in the heat source control unit 36. The defrosting operation means 42 performs a defrosting operation when frost or ice is generated in the evaporator 5 or the refrigerant pipe 6 in the vicinity, thereby enabling the heating operation to be continued. .

  Next, the operations of the heating operation and the defrosting operation in the hot water heating apparatus according to the embodiment will be described with reference to FIGS. Here, it is assumed that the power switch 32 of the main remote controller 31 is turned on, and the heat pump unit 1 is in a standby state.

  When the operation switch 27 of the terminal remote controller 26 is operated by the user and an instruction to start the heating operation is issued, the indoor control unit 37 receives the instruction signal to that effect and sends a signal to the heat source control unit 36 to start the heating operation. Output. In the heat source side control unit 36, the compressor 2, the expansion valve 4, the load side circulation pump 14, and the heat source side circulation pump 20 are appropriately driven to start the heating operation. When the hot water circuit 8 is heated by the operation of the heat source device 1 and the temperature of the cold air prevention thermistor 15 reaches 40 ° C., the indoor fan 12 is started to heat the indoor air and perform heating. (S1)

  If the outside air temperature decreases and the amount of heat absorbed from around the indoor heat exchanger 11 decreases, frost and ice adhere to the evaporator 5 and the refrigerant pipe 6 near the evaporator. Thereby, the heat exchange function of the evaporator 5 is further reduced, so that a defrosting operation (de-icing operation) is required. It is determined whether the outdoor heat exchange temperature detected by the outdoor heat exchange sensor 23, which is the defrosting condition, drops to a predetermined temperature of 0 ° C. (S2) Here, if the outdoor heat exchange temperature is high, there is no fear of frost or ice, so the process proceeds to s9 of No. In s9, it is determined whether there is an instruction to stop the operation. If Yes, the process proceeds to s10 to stop the operation. If the heating operation is continued, No returns to s2. When the outdoor heat exchange temperature falls below the freezing point in s2, the defrosting condition is satisfied, so in Yes, the process proceeds to s3 to switch to the defrosting preparation operation. In the defrosting preparation operation, the expansion valve 4 is fully opened, the rotation speed of the compressor 2 is stopped at the minimum rotation speed of 20 Hz or stopped, and the process proceeds to s4.

  In s4, it is determined whether the terminal connected to the hot water circuit 8 is the fan convector 10. If the fan convector 10 is in operation, the process proceeds to s5 in Yes, and the operation is continued without stopping the load side circulating pump 14 (2 minutes in this embodiment), so that the comparison from the heat source unit 1 is performed. By continuing to cool the hot water to the hot water circuit 8, the cool air prevention thermistor 15 can be cooled quickly and the indoor fan 12 can be stopped quickly. This can prevent the indoor unit from blowing the cool air for a long time to make the user uncomfortable.

  When the fan control vector 10 is not operating in s4, the process skips s5 and proceeds to s6. The hot water circuit 8 may be used not only with the fan convector 10 but also with no indoor fan 12 such as a floor heating panel or a radiator for heating, and the heat source control unit 36 is provided when there is no operation request signal from the indoor unit 10. (When only the floor heating panel and the heating radiator are connected instead of the indoor unit 10), when the defrosting condition is satisfied, the defrosting preparation operation is not required. , The time required for the defrosting operation can be reduced.

  In s6, the load-side circulation pump 14 is stopped, and the rotation of the compressor 2 is increased to 60 Hz, thereby heating the vicinity of the evaporator 5 to perform defrosting and deicing, and the process proceeds to s7. In s7, it is determined whether or not the defrosting has been completed, based on an increase in the outdoor heat exchange temperature. In this embodiment, when the outdoor heat exchange temperature exceeds 8 ° C., it is determined that the defrost termination condition has been satisfied, and the process proceeds to s8 with Yes to return to the normal heating operation. If No in s7 and the increase in the outdoor heat exchange temperature is insufficient, the defrosting operation is continued. Although not shown in FIG. 2-3, the heat source-side circulation pump 20 ends the defrost operation from the start of the defrost preparation operation (s3) in order to prevent the heat source-side circulation circuit 16 from depriving the heat. Stop until (s8).

  As described above, before starting the defrosting operation, by performing the defrosting preparation operation in which the operation of the load-side circulation pump 14 is continued for a predetermined time, the cold water after the compressor 2 is stopped is circulated to the hot water circuit 8, By cooling the cool air prevention thermistor 15 early and stopping the indoor fan 12 early, it is possible to prevent the indoor unit 10 from blowing the cool air for a long time to make the user uncomfortable.

  In addition, by using the E-con communication line as the terminal control line 40, the configuration of the indoor control unit 37 and the heat source control unit 36 can be simplified, thereby reducing the cost. Further, an indoor unit 10 made by another company, which is connected to the indoor unit 10 by E-con communication, can be used.

  Further, in the present embodiment, the power switch 32 of the main remote controller 31 has been described as being on and the heat pump unit 1 is in the standby state, but the power switch 32 of the main remote controller 31 has not been turned on. Even when the operation switch 27 of the terminal remote controller 26 is operated by the user, the operation based on the signal from the indoor control unit 37 of the indoor unit 10 is performed in the same manner as described above. 1 may be started, so that the heat pump unit 1 can surely execute the operation desired by the user operated by the terminal remote controller 26.

  Further, in the present embodiment, the underground heat source type heat pump unit 1 is shown as the heat source unit 1 of the hot water heating apparatus, but the present invention is also applied to a hot water heating unit using an air heat source type heat pump unit as a heat source unit. can do.

1 heat pump unit (heat source unit)
2 Compressor 3 Condenser 4 Expansion valve 5 Evaporator 7 Refrigeration circuit 8 Hot water circuit 9 First water-refrigerant heat exchanger 10 Fan convector (indoor unit)
11 indoor heat exchanger 12 indoor fan 15 cool air prevention thermistor (heat AC input sensor)
23 outdoor heat exchange sensor 36 heat source control unit 37 indoor control unit 38 reception circuit 40 terminal control line 41 transmission circuit 42 defrosting operation means

Claims (3)

In the heat source unit, a refrigeration circuit in which a compressor, a condenser, an expansion valve, and an evaporator are communicated with a refrigerant pipe, and an outdoor heat exchange sensor that detects a temperature of the evaporator,
The condenser comprises a water-refrigerant heat exchanger that performs heat exchange between the refrigeration circuit and the hot water circuit,
The indoor unit includes an indoor heat exchanger, an indoor fan, and a heat exchange input sensor that detects a temperature of hot water flowing into the indoor heat exchanger,
The hot water circuit is formed by connecting the water-refrigerant heat exchanger, the indoor heat exchanger, and a circulation pump with a hot water pipe,
The heat source unit includes a heat source control unit that controls the operation of the heat source unit, and a receiving unit that receives an operation request signal output from the indoor unit,
The indoor unit includes an indoor control unit that controls the operation of the indoor fan according to a temperature detected by the thermal AC input sensor, and a transmission unit that outputs a signal to the heat source unit,
A terminal control line that transmits an output signal from the transmitting unit of the indoor unit to the receiving unit of the heat source unit only in one direction,
During the heating operation, the indoor control unit operates the indoor fan when the temperature detected by the thermal AC input sensor is equal to or higher than a predetermined temperature,
The heat source control unit operates the compressor, the expansion valve, and the circulation pump,
Freezing of the evaporator or the refrigerant pipe, when the outdoor heat exchange sensor detects a predetermined temperature and the defrost condition is satisfied,
The defrost preparation operation is performed in which the compressor is stopped or reduced to a low rotation speed, the operation of the circulation pump is continued, and the hot water temperature detected by the hot AC input sensor is reduced to less than the predetermined temperature. A hot-water heating apparatus comprising: a defrosting operation unit that stops the circulation pump after the completion of the preparation operation and that operates the compressor at a predetermined rotation speed.   The hot water heating apparatus according to claim 1, wherein the defrosting preparation operation is performed for a predetermined time.   The said heat source control part did not perform the said defrost preparation driving | operation, when the said defrost condition is satisfied, when there is no signal of an operation request | requirement from the said indoor unit, The Claim 1 or Claim characterized by the above-mentioned. Item 3. A hot water heating device according to item 2.

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