JP3644373B2 - Heat pump floor heating system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat pump type floor heating apparatus.
[0002]
[Prior art]
A water circulation path is configured by connecting a pump and a floor heating device by piping, and by driving the pump, hot water heated by a water heat exchanger as a heating source is circulated and supplied into the water circulation path. A configured heat pump type floor heating apparatus is conventionally known. That is, in such a heat pump type floor heating device, the outdoor heat exchanger on the heat source side functions as an evaporator and the water heat exchanger on the use side functions as a condenser to supply hot water to the floor heating equipment. Then, floor heating is performed.
[0003]
[Problems to be solved by the invention]
By the way, when the floor heating is started up, the temperature of the water in the water circulation path or the floor for heating may be low (for example, 10 ° C. or less). In such a state, the conventional heat pump floor If floor heating is performed with a heating device, the amount of condensation in the water heat exchanger increases, and the high pressure on the water heat exchanger side cannot be maintained, and a normal refrigeration cycle may not be formed. In such a case, sufficient efficiency cannot be obtained, and the warming up of the floor may be deteriorated.
[0004]
The present invention has been made to solve the above-described conventional drawbacks, and an object of the present invention is to provide a heat pump type floor heating apparatus capable of shortening the start-up time and performing efficient floor heating. It is to provide.
[0005]
[Means for Solving the Problems]
Therefore, in the heat pump type floor heating apparatus according to the first aspect, the water circulation path 10 is configured by connecting the pump 3 and the floor heating apparatus 4 with piping, and the pump 3 is driven to exchange water heat as a heating source. In the heat pump type floor heating apparatus configured to circulate and supply the hot water W heated by the vessel 11 into the water circulation path 10, the detection means 27 for detecting the condensation temperature of the water heat exchanger 11, and the detection means 27 Control means 30 for controlling the water circulation amount of the water circulation path 10 based on the detected temperature, and at the start of the floor heating operation, when the detection temperature of the detection means 27 is low, the water circulation amount is lowered than when it is high. It is a feature.
[0006]
In the heat pump type floor heating apparatus according to the first aspect, when the detection temperature of the detection means 27 is low at the start-up of the floor heating operation, the amount of water circulation in the water circulation path 10 is reduced more than when the detection temperature is high. A normal refrigeration cycle that maintains the high pressure state of the water heat exchanger 11 can be formed at an early stage by reducing the amount of condensation in the exchanger 11.
[0007]
The heat pump type floor heating apparatus according to claim 2 is characterized in that when the detected temperature of the detected temperature is lower than a set reference value, the water circulation of the water circulation path 10 is stopped.
[0008]
In the heat pump type floor heating apparatus according to the second aspect, when the detected temperature is lower than the set reference value, the water circulation of the water circulation path 10 is stopped. Therefore, until the normal refrigeration cycle is formed, the water 3 in the water circulation path 10 of the hot water W by the pump 3 is stopped. It is possible to stop the circulation in
[0009]
The heat pump type floor heating apparatus according to claim 3 is characterized in that a plurality of set reference values having a height difference are set, and the water circulation amount is controlled for each set reference value.
[0010]
In the heat pump type floor heating apparatus according to the third aspect, the water circulation amount of the water circulation path 10 can be controlled for each set reference value, whereby the water circulation amount can be changed step by step, and normal refrigeration can be performed. The cycle can be reliably formed.
[0011]
The heat pump type floor heating device according to claim 4 is characterized in that the control of the water circulation amount is canceled when the detected temperature exceeds a set water temperature.
[0012]
In the heat pump type floor heating apparatus according to claim 4, when the set temperature of water in the water circulation path 10 is set to a low temperature, that is, when the bed temperature is kept relatively low, the water circulation is performed when the detected temperature exceeds the set water temperature. The amount control can be released. For this reason, when the detected temperature exceeds the set water temperature, circulation at 100% is possible without suppressing the amount of water circulation in the water circulation path 10.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, specific embodiments of the heat pump type floor heating apparatus of the present invention will be described in detail with reference to the drawings. FIG. 1 is a simplified overall view of a heat pump floor heating apparatus. This heat pump type floor heating apparatus includes a water circulation path 10 and heats the floor by circulating hot water heated in the refrigerant system circuit 2 through the water circulation path 10.
[0014]
The water circulation path 10 includes a pump 3, a floor heating device (floor heating panel) 4, and an expansion tank 5. The floor heating device 4 includes a hot water circulation pipe 6, and an inlet 6 a of the hot water circulation pipe 6 The discharge side of the pump 3 is connected by a hot water return pipe 7, and the outlet 6 b of the hot water circulation pipe 6 and the expansion tank 5 are connected by a hot water return pipe 8. The expansion tank 5 and the suction port of the pump 3 are connected by a pipe 9. That is, the water circulation path 10 is configured by connecting the pump 3 and the floor heating device 4 with the pipes 7, 8, 9 and the like. The water circulation path 10 has a heat exchange path 12 that constitutes a part of the water heat exchanger 11 (heating source) of the refrigerant system circuit 2, and heat exchange with the condensed refrigerant is performed in the heat exchange path 12. Is heated.
[0015]
The refrigerant system circuit 2 includes a compressor 15, a water heat exchanger 11, a heat exchanger 16, an expansion valve 17, a four-way switching valve 18, and an accumulator 19. That is, one primary port of the four-way switching valve 18 is connected to the discharge pipe 20 of the compressor 15, and the other primary port of the four-way switching valve 18 is connected to the suction pipe 21 of the compressor 15. The suction pipe 21 is provided with the accumulator 19. One secondary port of the four-way switching valve 18 is connected to the water heat exchanger 11 by a first gas pipe 22, and the other secondary port of the four-way switching valve 18 is connected to the heat exchanger 16 by a second gas pipe 23. Connected at. Further, the water heat exchanger 11 and the expansion valve 17 are connected by a first liquid pipe 24, and the expansion valve 17 and the heat exchanger 16 are connected by a second liquid pipe 25. A fan 26 is attached to the heat exchanger 16.
[0016]
By the way, this heat pump type floor heating apparatus sets a setting reference value and a detection means 27 for detecting the condensation temperature of the water heat exchanger 11 as shown in FIG. 2 for the control at the start of the floor heating operation. Setting means 28 for comparing, a comparison means 29 for comparing the set reference value of the setting means 28 with the detected temperature of the detection means 27, and a control for controlling the water circulation amount of the water circulation path 10 based on the comparison of the comparison means 29. Means 30. And at the time of floor heating rising, when the detection temperature of the said detection means is low, the said water circulation amount is reduced rather than when it is high. That is, according to the control means 30, the setting reference value is set by the setting means 28, the setting reference value is input to the comparison means 29, and the detected temperature is compared with the set reference value by the comparison means 29. . If the detected temperature is equal to or lower than the set reference value, the rotational drive of the pump 3 is stopped. That is, the water circulation of the water circulation path 10 is stopped. Conversely, if the detected temperature exceeds the set reference value, the pump 3 is driven to rotate and the water circulation path 10 is circulated. In addition, the detection means 27 is a temperature detection thermistor attached to the said water heat exchanger 11, for example, and the control means 30 is comprised by CPU which controls the whole of this heat pump type floor heating apparatus.
[0017]
Next, the floor heating operation of this heat pump type floor heating apparatus will be described. First, the compressor 15 is driven with the four-way switching valve 18 switched as shown in FIG. Then, the refrigerant flows to the four-way switching valve 18, the water heat exchanger 11, the expansion valve 17, the heat exchanger 16, and the four-way switching valve 18, and the water heat exchanger 11 functions as a condenser, and the heat exchanger. 16 functions as an evaporator. Therefore, when the pump 3 is driven, the hot water W in the expansion tank 5 flows into the outgoing pipe 7, circulates through the hot water circulation pipe 6, is returned to the return pipe 8, and then flows through the heat exchange path 12. . At this time, as described above, the hot water flowing through the heat exchange path 12 is heated by the water heat exchanger 11 functioning as a condenser, and then supplied to the expansion tank 5. Heated with warm water W. According to the heat pump type floor heating device, when the four-way switching valve 18 is switched from the state shown in FIG. 1 and the compressor 15 is driven, the refrigerant is changed to the four-way switching valve 18, the heat exchanger 16, the expansion valve. If the heat exchanger 16 functions as a condenser and the water heat exchanger 11 functions as an evaporator, the hot water W is cooled. This makes it possible to perform floor cooling operation.
[0018]
By the way, at the time of starting up the floor heating operation, the water temperature in the water circulation path 10 and the bed temperature are often low (for example, 10 ° C.) or less. In such a case, the amount of condensation in the water heat exchanger 11 is small. It becomes large and cannot obtain a sufficient high pressure, and it becomes difficult for the refrigerant system circuit 2 to form a normal refrigeration cycle, and there is a possibility that the start-up is extremely poor. However, in the heat pump type floor heating apparatus, it is possible to make the start-up good by performing the following control by the control means 30 and the like, which will be described with reference to FIG. Tc1 (for example, 30 ° C.) in FIG. 3 represents a set reference value when the condensation temperature is increasing, and Tc2 (20 ° C.) in FIG. 3 is a set reference value when the condensing temperature is decreasing. Show. When the condensing temperature is rising, the condensing temperature of the water heat exchanger 10 is detected, and when the detected temperature is lower than a set reference value Tc1 (for example, 30 ° C.), the water circulation path is not performed without driving the pump 3. During this time, the condensation temperature of the water heat exchanger 10 is sufficiently increased, and when the set reference value Tc1 is exceeded, the pump 3 is rotationally driven to start the water circulation in the water circulation path 10. . On the other hand, when the condensation temperature falls and exceeds 20 ° C., the water circulation of the water circulation path 10 is continued. When the condensation temperature becomes 20 ° C. or less, the driving of the pump 3 is stopped and the water circulation of the water circulation path 10 is stopped. . Therefore, in a water circulation state, a sufficiently high pressure can be obtained, a normal refrigeration cycle can be formed, efficient floor heating can be performed, and the rise can be improved.
[0019]
Next, FIG. 4 shows another control method. In this case, a plurality of set reference values having a height difference are set, and the water circulation amount is controlled for each set reference value. In this case, Tc1 (for example, 25 ° C.), Tc2 (for example, 30 ° C.), Tc3 (for example, 35 ° C.), Tc4 (for example, 40 ° C.), Tc5 (for example, 20 ° C.), Tc6 (for example, 25 ° C.) , Tc7 (for example, 30 ° C.), and Tc8 (for example, 35 ° C.), Tc1-Tc5 or less, the rotation speed of the pump 3 is R ₀ rpm, Tc1-Tc5 is exceeded, and Tc2-Tc6 is less than Tc2-Tc6 the number of revolutions and R ₁ rpm, Tc2-Tc6 the rotational speed of the pump 3 in the Tc3-Tc7 less beyond the R ₂ rpm, R ₃ a rotational speed of the pump 3 in Tc4-TC8 less beyond the Tc3-Tc7 and rpm, the rotational speed of the pump 3 and R ₄ rpm if it exceeds Tc4-TC8. In this case, for example, R _{0 is set} to ₀ rpm, R _{1 is set} to 10% of the normal speed of the pump 3, R _{2 is set} to 20% of the normal speed, and R _{3 is set} to 50% of the normal speed. the R ₄ and the rotational speed of the normal.
[0020]
That is, if the condensation temperature is increasing, the detection temperature of 25 ° C. or less, while stopping the rotation of the pump 3, i.e. the water circulation of water circulation route 10 maintaining the state stopped, if it exceeds 25 ° C., R ₁ Rotate the pump 3 at (normal 10%), circulate with a slight circulation amount, and if the condensation temperature rises and exceeds 30 ° C, rotate the pump 3 at R ₂ (normal 20%) If the condensing temperature rises and exceeds 35 ° C., the pump 3 is rotated at R ₃ (regular 50%) to further increase the water circulation amount of the water circulation route 10. When the condensation temperature rises and exceeds 40 ° C., the pump 3 is rotated at R ₄ (regular 100%). Conversely, TC8 if below the condensation temperature is lowered, the pump 3 is rotated at R _3, if the Tc7 below, the pump 3 is rotated at R _2, if the Tc6 below, the pump 3 R _When it is rotated at ₁ and becomes Tc5 or less, the pump 3 is driven and stopped.
[0021]
If such control is performed, it is possible to change the water circulation amount of the water circulation path 10 by changing the rotation speed of the pump 3 in accordance with the detected condensation temperature, and it is easy to form a normal refrigeration cycle. Thus, it is possible to more reliably reduce the startup time.
[0022]
By the way, in the control method shown in FIGS. 3 and 4, a set reference value is set and control is performed based on the set reference value. When the detected temperature is low, the amount of water circulation from the pump 3 to the water circulation path 10 may be lower than when the detected temperature is high. By controlling in this way, the water circulation amount can be changed to a continuous straight line without changing in a stepped manner, and a smooth operation becomes possible. Further, if the start-up is completed and the normal floor heating operation is started, that is, a timer unit is provided, and the above control may be canceled when a predetermined time has elapsed from the start of the floor heating operation.
[0023]
Next, although not shown in the drawings, as another embodiment, the control of the water circulation amount may be canceled when the detected temperature exceeds the set water temperature. That is, when the floor heating temperature by this heat pump type floor heating device may be relatively low, for example, when the set value of the return water temperature is 30 ° C., and the detected condensation temperature is 32 ° C., for example, The control of the water circulation amount of the water circulation path 10 by the pump 3 is canceled. This is because even if the floor heating temperature is low and the condensation temperature is low, a normal refrigeration cycle in this state can be sufficiently formed, and a normal refrigeration cycle can be formed. It is because it is not preferable for floor heating operation to stop the water circulation of the water circulation path 10 by the pump 3 or to reduce the water circulation amount.
[0024]
Although specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. That is, the setting reference value set by the setting means 28 can be changed according to the desired floor heating temperature, room temperature, etc., and the number of setting reference values set in FIG. 4 can be freely increased or decreased. In addition, the number of rotations of the pump 3 at each stage can be freely changed. Further, in the above embodiment, the increase or decrease (adjustment) of the water circulation amount of the water circulation path 10 is performed by controlling the number of revolutions of the pump 3. It is also possible to adjust the water circulation amount of the water circulation path 10 by controlling the flow rate with this flow rate adjusting mechanism without controlling the rotation speed of the pump 3 via a valve. Further, it can be changed as the set water temperature when the control of the water circulation amount is canceled when the detected temperature exceeds the set water temperature. Moreover, in the said embodiment, although the temperature of the water heat exchanger 11 is measured and the condensation temperature is grasped | ascertained, the condensation temperature is detected by other methods, for example, detecting the water temperature of the hot water going-out pipe 7, etc. Can also be grasped.
[0025]
【The invention's effect】
According to the heat pump type floor heating apparatus of the first aspect, the amount of hot water circulating in the water circulation path can be reduced when the floor heating is started up. A normal refrigeration cycle that maintains the high pressure state of the exchanger can be formed. As a result, the rise time can be shortened and efficient floor heating can be performed.
[0026]
According to the heat pump type floor heating apparatus of the second aspect, the circulation of the hot water in the water circulation path by the pump can be stopped until the normal refrigeration cycle is formed, and an efficient start-up can be performed.
[0027]
According to the heat pump type floor heating apparatus of the third aspect, the rotational speed can be changed stepwise, and a normal refrigeration cycle can be reliably formed.
[0028]
According to the heat pump type floor heating apparatus of claim 4, when the detected temperature exceeds the set water temperature, the water circulation amount of the water circulation path can be circulated with 100% circulation amount, and the floor temperature can be lowered. It is possible to operate according to the situation.
[Brief description of the drawings]
FIG. 1 is a simplified overall view showing an embodiment of a heat pump type floor heating apparatus of the present invention.
FIG. 2 is a simplified block diagram of the heat pump floor heating apparatus.
FIG. 3 is a relationship diagram between a pump and a condensation temperature showing a control method of the heat pump type floor heating apparatus.
FIG. 4 is a relationship diagram between a pump and a condensation temperature showing another control method of the heat pump type floor heating apparatus.
[Explanation of symbols]
3 Pump 4 Floor heating device 10 Water circulation path 11 Water heat exchanger 27 Detection means 30 Control means W Hot water

Claims (4)

The water circulation path (10) is configured by connecting the pump (3) and the floor heating device (4) with piping, and the pump (3) is driven to drive the water heat exchanger (11) as a heating source. In the heat pump floor heating apparatus configured to circulate and supply the hot water (W) heated by the water into the water circulation path (10), the detection means (27) for detecting the condensation temperature of the water heat exchanger (11); And a control means (30) for controlling the water circulation amount of the water circulation path (10) based on the detection temperature of the detection means (27), and the detection temperature of the detection means (27) is low at the start of floor heating operation. Sometimes, the heat pump floor heating device is characterized in that the amount of water circulation is lowered than when it is high. The heat pump floor heating device according to claim 1, wherein when the detected temperature of the detected temperature is lower than a set reference value, water circulation in the water circulation path (10) is stopped. The heat pump type floor heating apparatus according to claim 1, wherein a plurality of set reference values having a height difference are set, and the water circulation amount is controlled for each set reference value. The heat pump type floor heating apparatus according to any one of claims 1 to 3, wherein when the detected temperature exceeds a set water temperature, the control of the water circulation amount is canceled.

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