JPH04129017U - Floor heating device for heat pump - Google Patents

Abstract

(57) [Summary] [Purpose] To stabilize floor heating temperature and improve temperature adjustment accuracy without being affected by fluctuations in cooling water temperature due to fluctuations in gas engine rotation speed. [Structure] Cooling water for the gas engine in the heat pump device 2 is retained in the buffer tank 21. High temperature water is circulated from the high temperature layer in the buffer tank 21 into the floor heating panel 4 by the circulation pump 22. The flow rate of high temperature water flowing into the floor heating panel 4 from the buffer tank 21 is controlled by the flow rate adjustment valve 2.
Adjusted by 3. The flow rate adjustment valve 23 is connected to the floor heating panel 4
is controlled by the controller 27 so that the surface temperature is quickly and accurately stabilized at the set temperature. This control by the controller 27 is performed based on detection signals from the hot water temperature sensor 24 and the surface temperature sensor 25. [Effect] The buffer tank 21 absorbs temperature fluctuations in the gas engine cooling water and can supply stable high-temperature hot water to the floor heating panel 4, so the surface temperature of the floor heating panel 4 is stabilized. By controlling the flow rate adjustment valve 23, the control accuracy of the surface temperature of the floor heating panel 4 is improved.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is based on the gas engine exhaust gas of a heat pump device using a gas engine. In addition to performing floor heating using heat, improvements have been made to stabilize the temperature of the floor heating. This invention relates to a heat pump floor heating system.

0002

[Conventional technology]

Heat pumps traditionally used for air conditioning are generally driven by electric motors. The compressor compresses the refrigerant and radiates heat, and the expander absorbs external heat. It is configured to do so. Also, a gas engine is used instead of the electric motor. It is also known that This gas engine dissipates the heat generated when gas is combusted. In order to do this, the structure is such that cooling water is circulated around the engine housing. Sara In addition, the system is configured so that the cooling water that absorbs the heat generated by this gas engine is used for floor heating. A heated floor heating system is provided.

0003 Figure 3 is a schematic diagram of a floor heating system that uses exhaust heat from a gas engine. be. The gas heat pump (represented by GHP in the figure) 2 is connected to the outdoor unit 1 (not shown). The refrigerant circulates between the outdoor unit 1 and the indoor unit. illustration Although omitted, the outdoor unit 1 is provided with the gas engine and the outdoor heat exchanger, The indoor unit is equipped with an indoor heat exchanger. As mentioned above, the gas engine During cooling, the refrigerant that has absorbed heat in the indoor heat exchanger is transferred to the outdoor heat exchanger. During heating, the refrigerant that absorbs heat from the outside air is used for indoor heat exchange with the outdoor heat exchanger. Dissipate heat using a heat exchanger. On the other hand, the cooling water for the gas engine of the gas heat pump 2 flows through the circulation pipes 5 and 6. It is configured to circulate within a floor heating panel (hereinafter abbreviated as a floor heating panel) 4. It is. The cooling water is circulated by an electric pump (not shown) installed in the outdoor unit 1. It is done. The cooling water heated by the exhaust heat of the gas engine is heated inside the floor heating panel 4. The cooling water after the heat radiation is used again to cool the gas engine. This way During heating operation, the exhaust heat from the gas engine can be effectively used for floor heating. can.

0004 When floor heating is required, a remote control device 3 with a built-in control circuit is provided. The solenoid valve 7 is opened by operating a switch (not shown). When the solenoid valve is opened, the gas Cooling water warmed by engine exhaust heat is supplied to the floor heating panel 4. Also, floor heating The temperature of the chamber is adjusted by opening and closing the solenoid valve 7 according to the control flowchart shown in FIG. This is done by supplying and stopping cooling water. In other words, the water temperature on the outflow side of the floor heating panel 4 (this is the outlet hot water temperature) is detected by the temperature sensor 8 (step 11), and this outlet When the hot water temperature is higher than the remote control setting temperature set in the remote control device 3 (Fig. (indicated by "-"), the solenoid valve 7 is closed in step 14 and the hot water is supplied to the floor heating panel. 4. Make sure that it does not flow into 4. As a result, the temperature of the floor heating panel 4 becomes higher than the set temperature. Prevent it from rising. Also, when the surface temperature is less than the remote control setting temperature (Fig. (indicated by "+" inside), open solenoid valve 7 in step 13 to supply hot water to the floor heating panel. 4 to raise the temperature of the floor heating panel 4. Repeat this kind of control This brings the surface temperature of the floor heating panel 4 close to the remote control set temperature.

[0005]

[Problem that the idea aims to solve]

However, in the conventional example, the temperature of the cooling water supplied to the floor heating panel 4 is Since the temperature depends on the rotation speed of the gas engine, the temperature required by underfloor heating is always achieved. There is no guarantee that it will be possible. In other words, the indoor unit 3 and the floor heating panel 4 are operated for heating at the same time. In this case, priority is given to the operation of indoor unit 3, so if the set temperature of indoor unit 3 is high, The rotational speed of the gas engine also increases. In this state, set temperature of floor heating panel 4 If the temperature is set low, the temperature of the cooling water flowing into the floor heating panel 4 is high, so the floor heating panel In order to maintain the set temperature of the channel 4, the solenoid valve 7 must be opened and closed frequently. This causes problems such as the temperature of the floor heating panel 4 becoming unstable. In addition, in the conventional example, only the hot water temperature on the outlet side of the floor heating panel 4 is detected and the remote controller is installed. Since the configuration was such that the opening and closing of the flow rate regulating valve 7 was controlled according to the difference from the constant temperature, the floor heating pattern It takes time for the surface temperature of Panel 4 to stabilize around the remote control setting temperature. there were. Moreover, hot water flows into the floor heating panel 4 by opening and closing the flow rate adjustment valve 7. Since the configuration was such that the temperature was adjusted only by turning on or off, the surface temperature The range of change in temperature was large, and a stable surface temperature could not be obtained.

[0006]

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a gas engine in a gas heat pump. High-temperature cooling water is interposed between the installed cooling water pipe and the floor heating panel. a buffer tank for sending only the water to the floor heating panel, and a buffer tank for sending the a pump for circulating the cooling water to the floor heating panel; and the buffer tank. Controls the flow rate of hot water interposed between the floor heating panel and flowing into the floor heating panel. and a temperature setting device that sets the temperature of the floor heating panel by external operation. a surface temperature sensor that detects the surface temperature of the floor heating panel; and a surface temperature sensor that detects the surface temperature of the floor heating panel. Hot water temperature sensor that detects the temperature of high temperature cooling water flowing from the tank to the floor heating panel The temperature of the floor heating panel is set based on the surface temperature and hot water temperature. a controller that controls the flow rate regulating valve so as to stabilize the temperature at a set temperature by the device; and the controller subtracts the set temperature from the surface temperature. circulation pump control means for operating the circulation pump when the temperature difference is below a certain value; and when the circulation pump is in operation, based on the difference between the surface temperature and the set temperature. A target temperature that calculates the optimal temperature of hot water flowing into the floor heating panel and sets this as the target temperature. temperature calculation means, and the flow rate regulating valve only when the hot water temperature is higher than the target temperature. a flow rate adjustment valve opening control means for flowing hot water into the floor heating panel while adjusting the opening of the floor heating panel; It is equipped with the following.

[0007]

[Effect]

Cooling water heated by the exhaust heat of the gas engine remains in the buffer tank, The high-temperature cooling water flows out from the buffer tank in sequence, and is heated by a pump to the floor heating panels. sent to Le. Therefore, fluctuations in cooling water temperature due to fluctuations in gas engine rotational speed are This buffer tank absorbs the cooling water and supplies it to the underfloor heating panel at a stable high temperature. only is supplied. Further, the controller controls the operation timing of the circulation pump and the flow rate adjustment. The surface temperature of the floor heating panel is set by controlling the opening degree of the valve on the floor heating panel side. The temperature can be approached accurately and in a short time, and the range of surface temperature fluctuations can be reduced. This allows the surface temperature to be stabilized at the set temperature with little error.

[0008]

【Example】

Below, an embodiment of the heat pump floor heating device according to the present invention will be explained using drawings. I will explain. Figure 1 is a schematic configuration diagram of the heat pump floor heating device of this embodiment. Components that are the same as those in the conventional example shown in FIG. Ru. As shown in Fig. 1, the heat pump floor heating device of this embodiment is a gas heat pump. Buffer tank to which the cooling water pipes 5 and 6 of the gas engine (not shown) in the pump 2 are connected. It is equipped with a link 21. This buffer tank 21 stores cooling water for the gas engine. The high-temperature water is then sent out sequentially. That is, the buffer tank 21 Inside, there is a layer of high temperature water at the top, and a layer of low temperature water as you go to the bottom. Cooling water flows out through the cooling water pipe 6 and is used to cool the gas engine.

[0009] The hot water supply pipe 28 from the top layer of the buffer tank 21 to the floor heating panel 4 has a flow A quantity adjustment valve 23 and a circulation pump (for example, using an electric pump) 22 are interposed. ing. After the heat has been radiated by the floor heating panel 4, the cooling water is sent to the buffer via the outflow pipe 29. Return to tank 21. The flow rate adjustment valve 23 is a solenoid-driven three-way valve with variable opening. The current value (or pulse current duty) supplied to the node from the controller 27 The valve opening changes in proportion to the T ratio), allowing the flow of cooling water flowing into the floor heating panel 4. It is a variable adjustment. In other words, the solenoid of the flow rate adjustment valve 23 is in a de-energized state. In this case, the return path 30 side port is fully open, and the buffer tank 21 side port is fully closed. becomes. In this state, when the circulation pump 22 is operating, the floor heating panel 4 The hot water inside is returned from the outflow pipe 29 to the hot water supply pipe 28 via the return path 30. As a result, the hot water within the floor heating panel 4 circulates in a closed loop. Then, by energizing the solenoid of the flow rate adjustment valve 23, this energized current value is The opening degree of the floor heating panel 4 side port increases in proportion to this, and the return increases in inverse proportion to this. The opening degree of the channel 30 side port becomes smaller. As a result, the buffer tank 21 side port Hot water is supplied from the buffer tank 21 to the floor heating panel 4 at a flow rate proportional to the opening degree of the It will be done.

0010 Near the connection port of the hot water supply pipe 28 to the floor heating panel 4, there is water flowing into the floor heating panel 4. Temperature sensor for detecting the temperature of hot water (hereinafter referred to as hot water temperature sensor) 24 is provided on the surface of the floor heating panel 4 to detect the surface temperature. A sensor (hereinafter referred to as a surface temperature sensor) 25 is attached. The detection signal of the hot water temperature sensor 24 is input to the controller 27, and the surface temperature The detection signal of the temperature sensor 25 is input to the remote control 26, and the is input to the controller 27.

[0011] Although not shown, the remote control 26 has an on/off switch that instructs the start and stop of the floor heating. It is equipped with a heat switch and a temperature setting device to set the desired temperature for the floor heating. The controller 27 is composed of an electronic circuit, and the temperature detected by the surface temperature sensor 25 is The surface temperature of the floor heating panel 4 and the hot water temperature detected by the hot water temperature sensor 24 Circulation pump control that operates the circulation pump 22 based on the When the temperature is inside, it flows into the floor heating panel 4 based on the difference between the surface temperature and the set temperature. Target temperature calculation that calculates the optimal temperature of hot water and sets it as the target temperature, and the target temperature Therefore, only when the temperature of the hot water is higher, the opening degree of the flow rate adjustment valve is adjusted and the floor heating power is adjusted. Flow rate adjustment valve opening control is executed to allow hot water to flow into the channel. Specifics of these controls The details will be explained in the operation description below.

0012 The operation of this embodiment will be explained below using the flowchart of FIG. When the indoor unit 3 is in heating operation, the gas engine in the gas heat pump 2 The cooling water of the engine is heated by the exhaust heat, and this heated cooling water passes through the cooling water pipe 5. and flows into the buffer tank 21. Inside the buffer tank 21, there is high temperature cooling water. Cooling water stays in the upper layer, and the low temperature coolant stays in the lower layer, and the top layer has the highest temperature. It has become. In this state, when the on/off switch of the remote controller 26 is turned on, the controller The controller 27 is a floor heating panel detected by the surface temperature sensor 25 in step 31. The input signal of the surface temperature No. 4 (indicated as "panel temperature" in FIG. 2) is read. Then, in step 32, the remote control settings further set in the remote control 26 are Read the temperature and find the difference between the two temperatures. Here, from the surface temperature (panel temperature) If the difference in temperature after subtracting the set temperature is 1°C or less, in step 33 the circulation pump 2 2 is activated (ON) to cause hot water to flow into the floor heating panel 4. Conversely, the temperature difference is higher than 1°C, the surface temperature of the floor heating panel 4 is prevented from increasing further. To stop the heating, the circulation pump 22 is stopped (OFF) in step 34 and the Stop the flow of hot water to 4. In this case, the hot water inside the floor heating panel 4 stagnates, As heat is dissipated, the surface temperature decreases. When the circulation pump 22 is stopped, The energization to the flow rate adjustment valve 23 is also stopped.

[0013] When the temperature difference is 1°C or less, the surface temperature is slightly adjusted to be equal to the set temperature. Since it is necessary to adjust the flow rate adjustment valve 23, the process in steps 35 to 39 Controls the valve opening. That is, first, in step 35, the supply is supplied to the floor heating panel 4. Calculate the optimal temperature for hot water and use this as the target temperature for hot water. This hot water target temperature is Generally, the temperature is higher than the set temperature, and in order to bring the surface temperature closer to the set temperature. This is the minimum temperature required for optimal hot water. This is calculated using a predetermined relational expression. Melt.

[0014] Then, in step 36, the hot water temperature detected by the hot water temperature sensor 24 (in FIG. In step 37, read the "hot water inlet temperature") and set the hot water target. The temperature difference obtained by subtracting the hot water temperature (hot water inlet temperature) from the temperature is a positive value (“+” in the figure). ) or a negative value (displayed as "-" in the figure). Ru. Here, if the temperature difference is positive, the temperature of the hot water flowing into the floor heating panel 4 is higher than that of the hot water. Since the temperature will be lower than the standard temperature, the temperature of the hot water flowing into the floor heating panel 4 must be increased. It is not possible to reach the set temperature if the Therefore, in step 38, the flow rate adjustment valve (Fig. The opening degree of the buffer tank 21 side port of 23 (indicated as "electronic three-way valve") is increased by a predetermined unit (for example, 1% when fully open). Therefore, the buffer tank 21, high temperature hot water flows into the floor heating panel 4. At this time, from the buffer tank The flow rate of high-temperature hot water to be supplied is determined by opening the buffer tank side port of the flow rate adjustment valve 23. proportional to the degree. At this valve opening, the hot water temperature (hot water inlet temperature) is still If the hot water temperature is lower than the hot water target temperature, steps 37 and 38 are performed again and the flow is The opening degree of the buffer tank side port of the amount adjustment valve 23 is further increased by a predetermined unit. Below After that, by repeating steps 37 and 38, the hot water temperature (hot water inlet temperature) is The inflow amount of high-temperature hot water is increased by a constant amount until it matches the hot water target temperature.

[0015] Conversely, if the temperature difference is negative, the temperature of the hot water flowing into the floor heating panel 4 is equal to the hot water target. The temperature of the hot water flowing into the floor heating panel 4 must be lowered. If so, the set temperature cannot be reached. Therefore, in step 39, the flow rate regulating valve 23 is Decrease the opening degree of the buffer tank side port by a predetermined unit. Therefore, the buffer data The flow rate of high temperature hot water supplied from the tank 21 is determined by the opening degree of the buffer tank side port. The temperature decreases in proportion to the amount of decrease, and the temperature of the hot water flowing into the floor heating panel 4 decreases a little. So Therefore, with the valve opening at this time, the hot water temperature (hot water inlet temperature) is still lower than the hot water target temperature. If the flow rate adjustment valve 23 is high, the processes of steps 37 and 39 are performed again, and the The opening degree of the buffer tank side port is further reduced by a predetermined unit. After that, step 37 By repeating steps 39 and 39, the hot water temperature (hot water inlet temperature) matches the hot water target temperature. Reduce the inflow amount of high-temperature hot water by a certain amount until

[0016] In this way, the floor heating system of this embodiment can be operated by changing the operating state of the indoor unit 3. Even if the gas engine rotational speed fluctuates and the gas engine cooling water temperature fluctuates, By absorbing fluctuations in cooling water temperature in the buffer tank 21, temperature changes can be reduced. It is possible to supply high-temperature cooling water at a stable temperature with little temperature to the floor heating panel 4. In addition, the surface temperature of the floor heating panel 4 can be finely adjusted by adjusting the opening degree of the flow rate adjustment valve 13. This allows the surface temperature of the floor heating panel 4 to match the set temperature with high precision. Moreover, the temperature fluctuation width can be reduced.

[0017]

[Effect of the idea]

As explained in detail above, the present invention is a cooling system heated by the exhaust heat of a gas engine. By installing a buffer tank that retains water, the rotation speed of the gas engine can be changed. Fluctuations in cooling water temperature due to movement are absorbed by this buffer tank, and the floor heating panel can supply only stable high-temperature cooling water. Additionally, the circulation pump operates to send hot water from the buffer tank to the floor heating panel. By controlling the timing and the opening degree of the flow rate adjustment valve on the floor heating panel side, the floor heating is controlled. The surface temperature of the wall can be brought close to the set temperature with high accuracy in a short time, and the surface temperature can be The surface temperature can be stabilized at the set temperature with less error by reducing the fluctuation range of Wear.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a heat pump floor heating device according to the present invention.

FIG. 2 is a control flowchart by a controller constituting the same embodiment.

FIG. 3 is a schematic configuration diagram of a conventional heat pump floor heating device.

FIG. 4 is a control flowchart in the conventional example.

[Explanation of symbols]

1... Outdoor unit 2... Gas heat pump 4... Floor heating panels 5, 6... Cooling water piping 21... Buffer tank 22
...Circulation pump 23...Flow rate adjustment valve 24...Hot water temperature sensor 25...
Surface temperature sensor 26...remote controller 27...controller

Claims (1)

[Scope of utility model registration request] 1. A floor heating device for a heat pump, which is provided in a heat pump device driven by a gas engine and circulates cooling water of the gas engine within a floor heating panel, wherein the cooling water provided in the gas engine a buffer tank interposed between the water pipe and the floor heating panel for sending only high-temperature cooling water to the floor heating panel; and a pump for circulating the cooling water from the buffer tank to the floor heating panel. a flow rate adjustment valve that is interposed between the buffer tank and the floor heating panel and controls the flow rate of hot water flowing into the floor heating panel; and a temperature setting device that sets the temperature of the floor heating panel by external operation. , a surface temperature sensor that detects the surface temperature of the floor heating panel, a hot water temperature sensor that detects the temperature of high temperature cooling water flowing into the floor heating panel from the buffer tank, and based on the surface temperature and hot water temperature, In order to stabilize the floor heating panel temperature at the temperature set by the temperature setting device,
a controller that controls the flow rate adjustment valve, and the controller includes a circulation pump control means that operates the circulation pump when a temperature difference obtained by subtracting the set temperature from the surface temperature is a certain value or less; when the circulation pump is in operation, target temperature calculation means calculates the optimal temperature of hot water flowing into the floor heating panel based on the difference between the surface temperature and the set temperature and sets this as a target temperature; A floor heating device for a heat pump, comprising a flow rate adjustment valve opening degree control means that controls the opening degree of the flow rate adjustment valve and causes hot water to flow into a floor heating panel only when the hot water temperature is high.