JP5795275B2 - Hot water heater - Google Patents

Description

  The present invention relates to a hot water heater that heats and circulates a thermal fluid by exchanging heat with a heat source.

  Conventionally, in this type, a heat exchanger built in a heat source unit and heated by a burner, a circulation pump, and a plurality of branch paths having a heat medium supply valve and a radiator are connected in an annular shape. Then, the heat medium circulation path is formed, the burner and the circulation pump are operated by the operation signal on the radiator side, the heat medium supply valve is opened, and the heat medium (water or antifreeze liquid etc.) of the heat exchanger is used as the radiator. This is used to heat the room indoors. Compare the room temperature detected by the room temperature thermistor built in the radiator installed in the room with the set room temperature set by the remote controller. Some controlled the output of the machine and the rotation speed of the circulation pump. (See Patent Document 1)

JP-A-2-213619

  By the way, in this conventional device, the room temperature is detected by a room temperature thermistor built in a radiator installed indoors, but the accurate room temperature cannot be detected depending on the position where the radiator is installed. Even when the room temperature detected by the thermistor rises to the set room temperature, only the area around the radiator feels warm, or conversely, the area around the radiator feels too warm.

In order to solve the above-mentioned problems, the present invention is configured in particular in claim 1 to include a heat source device, a heat exchanger, a circulation pump, a radiator, hot water temperature detecting means for detecting the temperature of hot water, and hot water. operating portion and an outer air temperature sensor for detecting the outside air temperature, and a control unit, thermal fluid heated by heat exchange the heat source unit in said heat exchanger having a hot water temperature setting switch for setting the temperature the in hot water heating system which circulates to the radiator by the circulation pump, wherein the control unit is configured to set the output of the heat source apparatus by the difference between hot water temperature and the hot water set temperature, the output of the heat source apparatus When the heating load estimated by the outside air temperature detected by the outside air temperature sensor is used for setting the rotation speed of the circulation pump in response to the heating load and the estimation.

  According to the first aspect of the present invention, the heating load is estimated based on the output of the heat source unit set by the difference between the hot water temperature and the set temperature of the hot water and the outside air temperature, and the circulation is performed corresponding to the estimated heating load. Since the number of rotations of the pump is set, even if the outside air temperature is high, if the output of the heat source machine is large, the heating load is judged to be large and the number of revolutions of the circulation pump is set high. If the output of the machine is small, the heating load is judged to be small and the rotation speed of the circulation pump is set low, thereby controlling the rotation speed of the circulation pump in accordance with the heating load and consuming unnecessary power of the circulation pump. Can be suppressed.

  In addition, even if the hot water circulation circuit is composed of a large number of systems, the rotation speed of the circulation pump can be controlled according to the heating load, and wasteful power consumption of the circulation pump can be suppressed regardless of the number of systems of the hot water circulation circuit. It is something that can be done.

  Also, a room temperature thermistor that detects the room temperature is no longer necessary, and because the room temperature thermistor is not installed properly, even if the room temperature detected by the room temperature thermistor rises to the set room temperature, only the area around the radiator feels warm, On the other hand, it does not feel that the area around the radiator is too warm.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the hot water heating apparatus of one Embodiment of this invention. The flowchart figure at the time of the heating operation.

Next, a hot water heater according to an embodiment of the present invention will be described with reference to FIG.
Reference numeral 1 denotes a hot water heater main body according to the present embodiment, which is installed outside the room. Heat water exchanged and heated by the hot water heater main body 1 is supplied from a forward pipe 2 to a radiator 3 such as a floor heating panel or a panel heater. A hot water circulation circuit 5 is formed from the return pipe 4 to the hot water heater main body 1 after passing through and dissipating heat.

  The hot water heater main body 1 includes a blower 6 that blows combustion air, a constant oil level device 7 that always stores a certain amount of kerosene, a fuel pump 8 that supplies kerosene of the constant oil level device 7, and a blower 6, a heat source unit 9 composed of a burner that burns with combustion air blown by the fuel 6 and kerosene supplied by the fuel pump 8, a can body 10 for storing hot water circulating in the hot water circulation circuit 5, and the outgoing pipe 2 side The hot water thermistor 11 as a hot water temperature detecting means for detecting the temperature t of the hot water in the can body 10 and the combustion exhaust gas generated by the combustion flame of the heat source device 9 and the combustion of the heat source device 9 are provided in the can body 10. A heat exchanger 12 that is heated to exchange heat with the hot water in the can 10, an exhaust path 13 such as an exhaust pipe that guides the combustion exhaust gas that has passed through the heat exchanger 12 to the outside of the hot water heating apparatus body 1, and the can 10 warm water in the warm water circulation circuit 5 A circulation pump 14 to the ring, provided between the circulating pump 14 and the boiler body 10, in which the steam-water separator 15 that separates the hot air in the hot water has been built.

Reference numeral 16 denotes a remote controller for remotely operating the hot water heating apparatus body 1. The remote controller 16 heats the heat exchanger 12 by combustion of the heat source unit 9 to heat the hot water in the can body 10, and also supplies the hot water in the can body 10. An operation switch 17 for instructing the start or stop of the heating operation for circulating the radiator 3 to heat the air-conditioned space such as the room, and the temperature of the hot water in the can 10 heated by the heat exchanger 12 are set. A hot water temperature setting switch 18 as a hot water temperature setting means and a display unit 19 for displaying the temperature T set by the hot water temperature setting switch 18 are provided.
In this embodiment, the set temperature T of the hot water can be set between 20 ° C. and 80 ° C. with the hot water temperature setting switch 18.
Reference numeral 20 denotes an operation unit provided in the hot water heating apparatus main body 1 and includes an operation switch, a hot water temperature setting switch, and a display unit, like the remote controller 16.

Reference numeral 21 denotes a control unit for controlling the hot water heating apparatus main body 1 mainly using a microcomputer. The control unit 21 receives signals from various switches of the remote controller 16 or the operation unit 20 and signals from the hot water thermistor 11, and receives the blower 6, the fuel pump 8, and the circulation. The pump 14 is controlled.
Reference numeral 22 denotes an outside air temperature sensor provided in the hot water heater main body 1, which outputs the detected outside air temperature as a signal to the control unit 21.

  The control unit 21 can control the capacity of the blower 6 and the fuel pump 8 to vary the combustion amount within a range between a preset small combustion amount and a large combustion amount, during the heating operation. Is for controlling the amount of combustion so that the hot water temperature t in the can body 10 detected by the hot water thermistor 11 becomes a temperature in the vicinity of the set temperature T set by the hot water temperature setting switch 18 of the remote controller 16. At the start, the combustion amount of the heat source unit 9 is set to a large combustion amount so that the hot water temperature t in the can body 10 quickly rises to the set temperature T set by the hot water temperature setting switch 18, and then in the can body 10 If the hot water temperature t of the can 10 approaches the set temperature T, the combustion amount of the heat source unit 9 is gradually decreased, and if it is possible to maintain the hot water temperature t in the can 10 at the set temperature T, it is set in advance. Lower the combustion amount to a small amount When the hot water temperature t in the can body 10 reaches a temperature a predetermined temperature a higher than the set temperature T, combustion of the heat source unit 9 is stopped, and the hot water temperature t in the can body 10 is set to a predetermined temperature from the set temperature T. When the temperature a reaches a low temperature, combustion of the heat source unit 9 is started, and the amount of combustion is appropriately controlled so that the hot water temperature t in the can body 10 approaches the set temperature T.

Next, the heating operation will be described.
As shown in FIG. 2, first, when the operation switch 17 is turned on (S1), the control unit 21 compares the set temperature T set by the hot water temperature setting switch 18 with the hot water temperature t in the can 10 ( S2) If the hot water temperature t in the can body 10 is lower than the set temperature T + the predetermined temperature a, the output of the heat source unit 9 is increased to operate (S3), and then the process returns to (S2). If the hot water temperature t in 10 is equal to or higher than the set temperature T + predetermined temperature a, the heat source machine is stopped (S4), and the circulation pump 14 is operated at a higher rotational speed. (S5)

  Then, after a predetermined time has passed in that state (S6), the control unit 21 compares the hot water temperature t with the set temperature T (S7) and determines that the hot water temperature t in the can 10 is equal to or higher than the set temperature T. Next, it is determined whether the hot water temperature t in the can body 10 is equal to or higher than the set temperature T + predetermined temperature a (S8), and if the hot water temperature t in the can body 10 is equal to or higher than the set temperature T + predetermined temperature a, 9 is stopped (S9), and if the hot water temperature t in the can 10 is lower than the set temperature T + predetermined temperature a in (S8), the output of the heat source unit 9 is operated at a low level. (S10)

If it is determined in (S7) that the hot water temperature t in the can body 10 is lower than the set temperature T, then the control unit 21 determines the temperature difference between the hot water temperature t in the can body 10 and the set temperature T. (S11) When the temperature difference is determined to be small, the output of the heat source unit 9 is operated with a small output (S10), and when the temperature difference is determined to be medium, the output of the heat source unit 9 is operated within (S12). If it judges that, it will operate with the output of heat source machine 9 large. (S13)
In this embodiment, if the temperature difference between the hot water temperature t in the can 10 and the set temperature T is less than 10 ° C., the temperature difference is determined to be small, and the temperature difference between the hot water temperature t and the set temperature T is 10 ° C. or more. When the temperature difference is less than 20 ° C., the temperature difference is determined to be medium, and when the temperature difference between the hot water temperature t and the set temperature T is 20 ° C. or more, the temperature difference is determined to be large.

  Next, the control unit 21 sets the number of rotations of the circulation pump 14 based on the outside air temperature detected by the outside air temperature sensor 22, and stops the heat source unit 9 (S9) or operates the output of the heat source unit 9 with a small amount (S10). ), When it is determined that the outside air temperature is high or intermediate (S14), the rotation speed of the circulation pump 14 is set to a small value (S15), and when it is determined that the outside air temperature is low, the rotation speed of the circulation pump 14 is set. Is set inside. (S16)

  Further, when the output of the heat source unit 9 is operated in the middle (S12), when it is determined that the outside air temperature is high (S17), the rotational speed of the circulation pump 14 is set small (S1), and the outside air temperature is When it is determined to be intermediate, the rotation speed of the circulation pump 14 is set to medium (S16), and when it is determined that the outside air temperature is low, the rotation speed of the circulation pump 14 is set to a large value. (S18)

  When the output of the heat source unit 9 is operated at a high level (S13), when it is determined that the outside air temperature is high (S19), the rotational speed of the circulation pump 14 is set to the inside (S16), and the outside air temperature is When it is determined to be intermediate, the rotational speed of the circulation pump 14 is set to a large value (S18), and when it is determined that the outside air temperature is low, the rotational speed of the circulation pump 14 is set to the maximum. (S20)

  In this embodiment, when the outside air temperature is higher than 5 ° C, it is judged that the outside air temperature is high. When the outside air temperature is below 5 ° C and above -5 ° C, the outside air temperature is judged as intermediate and the outside air temperature is below -5 ° C. It is judged that the outside temperature is low.

  When the operation switch 17 is turned off after setting the output of the heat source unit 9 and the rotation speed of the circulation pump 14 (S21), the control unit 21 stops the heat source unit 9 and the circulation pump 14 and ends the heating operation. If the operation switch 17 is not turned off after setting the output of the heat source unit 9 and the rotational speed of the circulation pump 14 (S22), the process returns to (S7).

  As described above, the heating load is estimated based on the output of the heat source unit 9 and the outside air temperature, and the number of rotations of the circulation pump 14 is set based on the estimation. Therefore, if the output of the heat source unit 9 is large even if the outside air temperature is high, heating is performed. It is determined that the load is large, and the rotational speed of the circulation pump 14 is set high. Conversely, even if the outside air temperature is low, if the output of the heat source unit 9 is small, it is determined that the heating load is small and the rotational speed of the circulation pump 14 is set. By setting it low, the number of revolutions of the circulation pump 14 can be controlled in accordance with the heating load, and wasteful power consumption of the circulation pump 14 can be suppressed.

  Further, even if the hot water circulation circuit 5 is composed of a large number of systems, the number of revolutions of the circulation pump 14 can be controlled according to the heating load, and the wasteful power of the circulation pump 14 can be used regardless of the number of systems of the hot water circulation circuit 5. It is possible to suppress the consumption.

  In addition, since a room temperature thermistor for detecting the room temperature is not required, there is no inaccurate room temperature detection due to the position of the room temperature thermistor in the room, and even if the room temperature detected by the room temperature thermistor rises to the set room temperature. There is no state where only the periphery of the radiator feels warm, and conversely, the periphery of the radiator does not feel too warm.

  In the present embodiment, the heat source unit 9 is a burner that performs combustion, but the present invention is not limited to this, and a hot water device using a heat pump unit or an electric heater may be used.

DESCRIPTION OF SYMBOLS 9 Heat source machine 12 Heat exchanger 14 Circulation pump 11 Hot water temperature detection means 18 Hot water temperature setting switch 20 Operation part 21 Control part 22 Outside temperature sensor

Claims (1)

A heat source device, a heat exchanger, a circulation pump, a radiator, a hot water temperature detecting means for detecting the temperature of hot water, an operation unit having a hot water temperature setting switch for setting the temperature of hot water, and an outside air temperature are detected. and outside air temperature sensor, and a control unit, at a thermal fluid which is heated by heat exchange the heat source apparatus at the heat exchanger in the hot water heating system which circulates to the radiator by the circulation pump, wherein control unit is configured to set the output of the heat source apparatus by the difference between hot water temperature and the hot water set temperature, the heating load is estimated and the output of the heat source apparatus, by the outside air temperature detected by the outside air temperature sensor, the A hot water heating apparatus, wherein the number of rotations of the circulation pump is set in accordance with the estimated heating load.

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