JPH11182866A - Floor heating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor heating system excellent in floor heating temperature response employing a GHP for suppressing start/stop frequency of gas engine. SOLUTION: In a floor heating system 1, a hot water supply system is provided with a valve for controlling the floor heating of a plurality of rooms individually and the opening time of the valve is controlled in combination with the hot water delivery temperature (high and low stages). A water supply pump 21 is operated when only one room is heated. When the temperature is lower than a target level even in one room, temperature of floor heating circulation water is raised by increasing the output of a gas engine 102 and the water supply valve for the floor heating panel is opened for a long time for a low temperature room but opened for a short time for a high temperature room. When the temperature of a temperature sensor is higher than a reference level for in all rooms, temperature of floor heating circulation water is lowered by lowering output of the gas engine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a floor heating system for performing floor heating using a gas heat pump (hereinafter, also referred to as GHP) as a heat source. In particular, the present invention relates to a floor heating system which is excellent in responsiveness to the temperature of the floor heating and has been improved so that the frequency of starting and stopping the gas engine can be suppressed low.

[0002]

2. Description of the Related Art GHP is a cooling / heating system using an engine using city gas or the like as a fuel as a prime mover. This G
A system for performing floor heating using an HP as a heat source has recently begun to spread. In a floor heating system using GHP as a heat source, when the temperature of the room to be heated by the floor does not reach the user's instruction value (in the case of thermo-ON), high-temperature hot water is supplied and the floor heating is performed. When the temperature of the room has reached the instruction value of the user (when the thermostat is OFF), hot water of low temperature is discharged. In this system, the floor heating thermo ON
Regardless of / OFF, hot water is constantly circulating.

FIG. 2 is a schematic diagram showing a system configuration in a case where the number of target rooms for floor heating is one. GHP body 211
Has a gas engine or a heat exchanger (not shown) as a heat source device. The floor heating circulating water is sent to the floor heating panel 237 through the pipe 223 by the water supply pump 221.
The floor heating circulating water that has released heat into the room by the floor heating panel returns to the GHP body 211 through the pipe 225. The operation of the floor heating is operated by the floor heating remote controller 257 in the room. The floor heating remote controller 257 has a built-in temperature sensor (variable thermostat) for detecting the indoor temperature.

In the system shown in FIG. 2, the output of the GHP heat source unit is increased to raise the temperature of the floor heating circulating water (for example, 60 ° C.) in order to increase the indoor temperature when the thermo is turned on. The temperature of the floor heating circulating water is set to a low temperature (for example, 40 ° C.) in order to suppress a temperature decrease in the room (so as not to drop too much). As described above, there is no problem when only one room is to be heated.

[0005] FIG. 3 is a diagram schematically showing the overall configuration of a floor heating system having a normal heat source unit when the number of floor heating target rooms is two. In this case, the floor heating system includes two floor heating panels (first room panel 335, second room panel 3).
37), the floor heating circulating water can be sent. That is, water is supplied to the first chamber panel 335 from the water supply pump via the pipe 323 and the first valve 327. The second chamber panel 337 has a pipe 32 from the water supply pump.
3. Water is sent through the second valve 329. Return water from both chamber panels returns to the heat source unit 311 through the pipe 343. Here, the heat source unit 311 is a gas water heater or the like.

In the floor heating system of FIG. 3, the temperature of each room is controlled by controlling the opening and closing time of each of the water supply valves 327 and 329. That is, when the second chamber is sufficiently warm and the thermostat is OFF, the second valve 329 is opened, for example, only for 25% of the time (one minute for four minutes) to avoid excessive heat input to the second chamber. On the other hand, sufficient heat is supplied to the floor heating panel 335 of the first room that has not yet reached the set temperature, with the opening time of the water supply valve 327 being 100%. The temperature at the time of the floor heating circulating water is constant at 60 ° C. In other words, in this method, a valve is provided for each system in the hot water supply system, and the ratio of the valve opening time and the valve closing time within a predetermined time is changed while the supplied hot water temperature is constant,
By repeating this control periodically, the floor heating system performs individual control of a plurality of rooms.

[0007]

However, when this method is applied to a system using GHP as a heat source, the GHP outdoor unit main body repeatedly starts and stops every time floor heating is turned on / off. There is a problem that the load on the machine increases. Further, in the system using GHP as a heat source, the rise of tap water temperature is slower than in a system using a gas fired water heater as a heat source.
If the system is temporarily stopped to cope with F and is started when the thermostat is turned on again, there is a demerit that the tapping water temperature does not easily rise and the comfort is impaired.

The present invention has been made in view of such problems, and is a floor heating system for performing floor heating using GHP as a heat source. It is an object of the present invention to provide a floor heating system capable of reducing the temperature of the floor.

[0009]

In order to solve the above problems, a floor heating system according to the present invention comprises: a gas engine; a heat cycle having a compressor driven by the gas engine; A floor heating heat exchanger that exchanges heat with the heating circulating water, a water pump that circulates the floor heating circulating water, a plurality of floor heating panels arranged in multiple rooms, and a floor heating circulating water for each floor heating panel Floor heating comprising: a valve disposed in a pipe to be fed, a temperature sensor for detecting each room temperature, a control unit for controlling each device, and an operation unit for instructing a floor heating operation of each room by a user. A system;
If the floor heating operation command is issued to the operation unit in at least one room, the water pump is operated. If the temperature of the temperature sensor is lower than the target value in at least one room, the output of the gas engine is increased to increase the floor heating. The temperature of the circulating water is set to a high temperature. At this time, for a room with a low temperature sensor temperature (low temperature room), a water supply valve to the room floor heating panel is opened at a high time rate,
For a room with a high temperature sensor (high-temperature room), the water supply valve to the room floor heating panel is opened at a low rate, and when the temperature of the temperature sensor is higher than a reference value in all the rooms, the output of the gas engine is output. And lowering the temperature of the floor heating circulating water to a low temperature.

That is, in the floor heating system using the GHP, a valve is provided in the hot water supply system to individually control the floor heating of a plurality of rooms, and the valve opening time of the valve and tapping temperature (two steps of high temperature and low temperature) ) To control.

In the floor heating system of the present invention, when the above-mentioned floor heating circulating water temperature is low, each water supply valve can be kept open. Further, heat exchange between the heat medium of the heat cycle and the floor heating circulating water may be performed instead of the cooling water of the gas engine. Further, in addition to the cooling water of the gas engine, the heat medium of the heat cycle and the floor heating circulating water may also exchange heat.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram showing an overall configuration of a floor heating system according to one embodiment of the present invention. First, the GHP heat cycle 100 depicted at the top of the figure will be described. The heat cycle 100 includes a compressor 101 and a heat exchange unit 19.
(Condenser), expansion valve 115, evaporator 117, and pipes connecting them.

The compressor 101 is driven by a gas engine 102 (motor). The gas engine 102 is a reciprocating engine that receives supply of city gas from a gas supply pipe 103 and uses the gas as fuel. This gas engine 10
The speed (output) 2 is controlled by the gas flow control valve 104 of the gas supply pipe 103. Compressor 101
Sucks the heat medium from the suction port 101a, compresses the heat medium, and discharges the heat medium from the discharge port 101b.

The compressed heat medium passes through a pipe 17 and passes through a heat exchanger 19 (condenser) in the floor heating heat exchanger 11.
It exchanges heat with the floor heating circulating water to be cooled and condensed. The condensed heat medium is sent through the pipe 20 and expands in the expansion valve 115 and the evaporator 117. At this time, a large amount of heat is received from the outside air by the fan 118. The heat medium returns from the evaporator 117 to the compressor 101 again, and thereafter circulates similarly.

A gas engine 102 is installed in the floor heating heat exchanger 11.
There is another route to send the output of It is the cooling water of the gas engine 102 (normal temperature 70-80 ° C)
The gas is sent from the gas engine 102 to the floor heating heat exchanger 11 through the pipe 13, and heat is transferred to the floor heating circulating water by the heat exchange unit 15.

Next, the circulation path of the floor heating circulating water will be described. The floor heating circulating water, which has received heat from the heat medium of the heat cycle and the cooling water of the gas engine in the heat exchange unit 45 in the floor heating heat exchanger 11 and has been heated, is supplied to the water pump 2.
Pressurized at 1. Part of the floor heating circulating water is sent to the first chamber panel 35 through the pipe 23 and the first valve 27, and the panel discharges heat into the first chamber. In addition, a part of the floor heating circulating water is sent to the second chamber panel 37 through the pipe 25 and the second valve 29, and the panel radiates heat into the second chamber. The water from each floor heating panel 35, 37 is connected to a pipe 39,
It returns to the floor heating heat exchanger 11 through 41 and 43 again.

The water supply pump 21, the water supply valve 27,
29, gas supply regulating valve 104 for gas engine 102
Is controlled by the control unit 51.

In the first and second chambers, thermostats (temperature sensors 53 and 55) whose settings are variable are arranged, and the signals of the thermostats 53 and 55 are sent to the control unit 51. An operation unit 57 is connected to the control unit 51, and a user's command regarding the operation of the entire floor heating system is sent from the operation unit 57 to the control unit 51.

Next, the control operation of the control unit 51 will be described. First, when the floor heating is being operated even in one room, the water supply pump is always operated, and the valve opening time of the system connected to the room where the floor heating is stopped is set to 0%.

Next, a plurality of thermostats 53 and 55 are provided.
Are all thermo-ON, the opening of the gas supply adjusting valve 104 to the gas engine 102 is increased to increase the gas engine 10
By raising the output of step 2, the tapping temperature of the floor heating circulating water is raised to a high temperature (50 to 60 ° C.), and each of the water supply valves 27 and 29 is opened for 100% (normally open) so that each room is heated to the maximum To send.

On the other hand, when the thermo ON chamber and the thermo OFF chamber coexist, the tapping temperature is high, but the valve opening time is 100% in the thermo ON chamber and 25% in the thermo OFF chamber. Furthermore, when all of the plurality of chambers are in the thermo-OFF state, the output of the gas engine 102 is reduced and the outlet temperature is switched to a low temperature. At this time, the valve opening time is 100% for all rooms.

As described above, in the floor heating system of the present embodiment, the control is performed by combining the tap water temperature and the opening time of the hot water supply valve depending on the situation of the floor heating in a plurality of rooms. With this control, even a floor heating system based on GHP can individually cope with floor heating in a plurality of rooms. Also,
Even if the floor heating is turned off, only the target value of the hot water temperature needs to be changed, so that the burden on the GHP outdoor unit due to frequent start / stop can be avoided.

[0023]

As is apparent from the above description, according to the present invention, in a floor heating system for performing floor heating using GHP as a heat source, the responsiveness of the floor heating temperature is excellent, and the start / stop frequency of the gas engine is reduced. A floor heating system that can be kept low can be provided.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an overall configuration of a floor heating system according to one embodiment of the present invention.

FIG. 2 is a schematic diagram showing a system configuration in a case where the number of target rooms for floor heating is one.

FIG. 3 is a diagram schematically illustrating an overall configuration of a floor heating system having a normal heat source device when two floor heating target rooms are provided.

[Explanation of symbols]

Reference Signs List 1 floor heating system 11 floor heating heat exchanger 13 cooling water pipe 15 heat exchange section 17, 20 heating medium pipe 19 heat exchange section 21 water feed pump 23, 25, 31, 33, 39, 41, 43 floor heating circulation pipe 27, 29 Valve 35 First floor heating panel 37 Second floor heating panel 45 Heat exchange unit 51 Control unit 53, 55 Thermostat 57 Operation unit 100 Gas heat pump heat cycle 101 Compressor 102 Gas engine 103 Gas supply pipe 104 Flow control valve 115 Expansion valve 117 evaporator 118 fan

Claims (8)

[Claims] 1. A gas engine, a heat cycle having a compressor driven by the gas engine, a floor heating heat exchanger for exchanging heat between cooling water of the gas engine and floor heating circulating water, and a floor heating circulating water. A water pump for circulating water, a plurality of floor heating panels arranged in a plurality of rooms, a valve arranged in a pipe for sending circulating floor heating water to each floor heating panel, and a temperature sensor for detecting each room temperature. A floor heating system comprising: a control unit for controlling each device; and an operation unit for instructing a floor heating operation of each room by a user; a floor heating operation command for at least one room from the control unit command. When the temperature is output to the operation unit, the water pump is operated. When the temperature of the temperature sensor is lower than the target value in at least one room, the output of the gas engine is increased to raise the temperature of the floor heating circulating water to a high temperature. , At this time, For a room with a low temperature sensor temperature (low temperature room), a water supply valve to the room floor heating panel is opened at a high time rate, and for a room with a high temperature sensor temperature (high temperature room), a water supply valve to the room floor heating panel. Is opened at a low time ratio, and when the temperature of the temperature sensor is higher than a reference value in all the rooms, the output of the gas engine is reduced to lower the temperature of the circulating water of the floor heating. system. 2. The floor heating system according to claim 1, wherein when the floor heating circulating water temperature is low, each water supply valve is always opened. 3. The floor heating system according to claim 1, wherein the floor heating heat exchanger exchanges heat between the heat medium of the heat cycle and the floor heating circulating water in place of the cooling water of the gas engine. 4. The floor heating system according to claim 1, wherein in the floor heating heat exchanger, in addition to the cooling water for the gas engine, the heat medium of the heat cycle and the floor heating circulating water also exchange heat. 5. The floor heating system according to claim 1, wherein a water supply valve is always opened for a floor heating panel of the low-temperature room. 6. The floor heating panel of the high-temperature room, wherein the water supply valve is opened only for 20 to 30% of the time.
5. The floor heating system according to any one of 5). 7. The floor heating system according to claim 1, wherein the temperature sensor is a thermostat whose setting is variable. 8. When the temperature of the circulating water for floor heating is 5
The temperature is set to 0 to 60 ° C and 30 to 40 ° C at low temperature.
A floor heating system according to any one of the preceding claims.