JPH09170764A - Control apparatus for hot water heating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an accuracy in heating temperature of an indoor device. SOLUTION: A heating amount of a burner 100 is controlled in such a manner that a temperature of hot water flowed out of a heating heat exchanger 11 may become a constant temperature. A required heating calorie radiated by a heating heat exchanger 16 is calculated in response to a temperature difference between a set temperature and an indoor temperature. A flow rate of hot water passed through the heating heat exchanger 16 is calculated in response to a requisite heating calorie and a temperature of flowing-out hot water flowed out of the heating heat exchanger 16. A thermal radiating amount at the heating heat exchanger 16 is determined in reference to a temperature difference between a temperature of the flowing-in hot water and a temperature of the flowing-out hot water and a flowing flow rate. Since hot water having a specified temperature is supplied from the heating heat exchanger 11 to the heating heat exchanger 16, a flow rate variable valve 14 is controlled in such a way that a detected flow rate of a water amount sensor 18 may become the calculated flow rate, resulting in that it is possible to perform a high accurate heating operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for a hot water heating system for heating a room by circulating hot water in an indoor unit.

[0002]

2. Description of the Related Art In a hot water heating system in which hot water heated by a burner or the like is circulated in an indoor unit, the required amount of heat to be dissipated in the indoor unit is calculated based on the temperature difference between the set temperature and the indoor temperature, and In some cases, the amount of combustion of a burner or the like that heats hot water is controlled so that the required amount of heat is radiated by the indoor unit.

There is also a combined hot water heating system in which hot water circulation circuits are provided in parallel in order to circulate hot water not only to the indoor unit but also to the floor heating panel installed on the floor of the room. In such a hot water heating system, in order to adjust the heating capacity of the floor heating panel, the floor heating control valve provided in the hot water circulation circuit to the floor heating panel is circulated by varying the open rate according to the set heating capacity. Adjust the amount of hot water
It controls the floor temperature. Therefore, the heating amount of the burner is adjusted so that the temperature of the hot water heated by the burner becomes constant.

[0004]

As described above, in the hot water heating system in which hot water is circulated between the indoor unit and the floor heating panel, stable temperature control can be performed when the indoor unit is operated alone. When heating is performed with both the indoor unit and the floor heating panel, the heating amount of the burner is simply controlled to maintain the hot water temperature at a constant temperature in order to control the heat generation amount of the floor heating panel. The amount of hot water to the indoor unit changes as the amount of hot water circulating through the floor heating panel changes, and the amount of heat released by the indoor unit also changes, making it impossible to accurately manage the amount of heat released from the indoor unit, and There is a problem that it is difficult to stabilize.

It is an object of the present invention to provide a controller for a hot water heating system that can reliably release a required amount of heat in a hot water heating system in which hot water is circulated to the indoor unit.

[0006]

According to the hot water heating system of the present invention, the room temperature setting means is used when the hot water having a constant temperature heated by the heating source is circulated in the indoor water heater installed in the room through the hot water circulation circuit by the pump. Based on the temperature difference between the room temperature detected by the room temperature sensor and the set temperature set to, the necessary heat quantity to be released by the indoor heater is calculated by the necessary heat quantity calculating means, and the hot water temperature flowing out from the indoor heater is calculated. In order to adjust the flow rate of hot water in the hot water circulation circuit based on the required heat quantity calculated by the necessary heat quantity calculation means and the outflow hot water temperature of the indoor heater detected by the outflow hot water temperature detection means when detected by the outflow hot water temperature detection means. The flow rate calculation means calculates the flow rate to be adjusted by the variable flow rate valve.

The flow rate variable valve control means controls the flow rate variable valve based on the calculated flow rate and the flow rate detected by the flow rate sensor that detects the flow rate of the hot water passing through the indoor heater, so that the detected flow rate becomes the calculated flow rate. To control the opening of the variable flow valve. With this, in the indoor heater, an appropriate amount of heat according to the indoor temperature is surely radiated, and accurate heating can be performed.

Even when the hot water circulation circuit forms a circulation circuit for the floor heating panel, if the temperature of the hot water heated by the heating source is constant, the above-mentioned control ensures the indoor heater. Since it is possible to manage the amount of heat radiation in, it is possible to perform accurate heating.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described based on the following embodiments. FIG. 1 shows an embodiment of a hot water heating type air conditioner system according to the present invention. In FIG. 1, 1
Is an outdoor unit having a heating source and a cooling source and installed outdoors, 2
Is an indoor unit arranged on the wall above the room, and is connected to the outdoor unit 1 by a hot water pipe and a cooling pipe.
Is a floor heating panel which has hot water pipes for heat radiation and is arranged on the floor surface in the room, and is connected to the outdoor unit 1 by the hot water pipes. The outdoor unit 1, the indoor unit 2, the floor heating panel 3, the hot water pipe, and the cooling pipe form a hot water circuit 10 for heating and a refrigeration cycle 20, respectively.

In the outdoor unit 1, as a constitution of the hot water circuit 10, a heat exchanger 11 for heating, a circulation pump 12 driven at a constant rotation, a floor heating valve 13, and a needle are driven by a stepping motor to change the flow rate. A variable flow valve 14 for controlling, a pressure tank 15, a water amount sensor 18 are provided, and a gas burner 100 as a heating source is provided. The refrigeration cycle 20 is provided with a compressor 21, a condenser 22, a strainer 23, and a capillary tube 24, which are driven by an inverter-controlled motor to compress Freon gas that is a refrigerant, and the condenser 22 has a radiating fan 26. Is provided.

In the indoor unit 2, a heating heat exchanger 16 is provided as a configuration of the hot water circuit 10, and a cooling heat exchanger 25 is provided as a configuration of the refrigeration cycle 20.
Convection fan 2 for circulating indoor air for 6,25
00 is provided and the indoor air is cooled by the heat exchanger 25 for cooling.
→ Pass through the heat exchanger 16 for heating in this order, and send it out to the room again.

In the outdoor unit 1, the indoor unit 2 and the floor heating panel 3, in the hot water circuit 10, the inflow side of the heating heat exchanger 11 is connected to the discharge side of the circulation pump 12, and the outflow side of the heating heat exchanger 11 is connected. Is connected to the inflow side of the heating heat exchanger 16 of the indoor unit 2 via the variable flow rate valve 14. The hot water pipe is branched between the inflow side of the heating heat exchanger 11 and the discharge side of the circulation pump 12, and the branched hot water pipe is connected to the inflow side of the floor heating panel 3 via the floor warming valve 13. Has been done. The hot water pipe on the outflow side of the heating heat exchanger 16 and the hot water pipe on the outflow side of the floor heating panel 3 join together and are connected to the suction side of the circulation pump 12 via the pressure tank 15.

The hot water pipe is branched on the outflow side of the heating heat exchanger 11, bypasses the indoor unit 2 and the floor heating panel 3, and a small amount of hot water is fed from the heating heat exchanger 11 to the circulation pump 12. It is a bypass pipe 17 for direct return, and the outflow side of the bypass pipe 17 is connected to the suction side of the circulation pump 12 and joins with the outflow side of the pressure tank 15.

In the hot water circuit 10 having the above structure, the circulation pump 12 is mainly operated to operate the circulation pump 12 →
In the circulation circuit of the heat exchanger 11 for heating → the variable flow valve 14 → the heat exchanger 16 for heating → the pressure tank 15 → the circulation pump 12, the high temperature water in the heat exchanger 11 for heating heated to high temperature by the burner 100 A circulation pump 12 → floor warming valve 13 →
A low temperature water circulation circuit for circulating the low temperature water returned to the circulation pump 12 is formed by the circulation circuit of the floor heating panel 3 → the pressure tank 15 → the circulation pump 12.

The high-temperature water in the heating heat exchanger 11 heated by the burner 100 circulates in the circulation circuit of the circulation pump 12 → the heating heat exchanger 11 → the bypass pipe 17 → the circulation pump 12 to obtain the floor. The hot water in the low-temperature water circulation circuit that circulates to the heating panel 3 is heated.

On the other hand, in the refrigerating cycle 20, the CFC refrigerant circulates through the refrigerant compressor 21 → condenser 22 → strainer 23 → capillary tube 24 → cooling heat exchanger 25 → refrigerant compressor 21, and the refrigerant is circulated during the circulation. Is in the vapor phase in the condenser 22 →
The state of the liquid phase is changed to release heat, and the heat exchanger 25 for cooling changes the state of the liquid phase (fog) to the vapor phase to absorb heat and cool the indoor air.

The control device 400 controls various operations by a microcomputer in accordance with the remote controller 4 operated by the user, and the main part is provided in the outdoor unit 1.
In the indoor unit 2, a receiving unit for receiving an infrared operation signal of the remote controller 4, a detecting unit for performing detection by various sensors provided in the indoor unit 2, a driving unit for driving the convection fan 200, A communication unit that communicates control signals between each unit of the indoor unit 2 and the main unit of the outdoor unit 1 is provided.

Further, in the main part, the operation of the compressor 21 of the refrigeration cycle 20 in the cooling operation and the dehumidifying operation is performed separately from the microcomputer for the main operation including the heating operation such as the combustion control of the burner 100 using gas as fuel. A cooling microcomputer for controlling is separately provided.

In order to perform various controls, the control device 400 has a high temperature water thermistor 401 on the outflow side of the heating heat exchanger 11, the discharge side of the circulation pump 12 and the floor warming valve 13.
Between the low temperature water thermistor 402, the indoor hot water thermistor 403 on the outflow side of the heating heat exchanger 16 of the indoor unit 2, the indoor heat freezing thermistor 404 on the cooling heat exchanger 25, the indoor unit 2
A room temperature thermistor 405 and a humidity sensor 406 are provided inside.

In the hot water heating type air conditioning system having the above structure, the controller 400 controls the single heating operation by the indoor unit 2 alone, the floor single operation by the floor heating panel 3 only, and the duet heating by the floor heating panel 3 and the indoor unit 2. The operation, the dry operation using only the indoor unit 2, the duet dry operation using the floor heating panel 3 and the indoor unit 2, and the cooling operation using the indoor unit 2 are controlled. Here, the independent heating operation using only the indoor unit 2, the floor independent operation using only the floor heating panel 3, and the duet heating operation using the floor heating panel 3 and the indoor unit 2 will be described below.

[Independent Heating Operation] In the independent heating operation, the room is heated only by the indoor unit 2. In the independent heating operation, the circulation pump 12 is started in response to the ON operation of the heating operation of the remote controller 4, the combustion of the burner 100 is started, and the flow rate variable valve 14 is fully opened to make the remote controller 4 operate.
The target hot water temperature is set between 58 ° C. and 85 ° C. based on the target indoor temperature Ts set by the room temperature Tr and the indoor temperature Tr detected by the room temperature thermistor 405.
The combustion amount of the burner 100 is controlled so that the hot water temperature detected by 1 becomes the target hot water temperature. Further, the convection fan 200 of the indoor unit 2 is controlled in eight stages in proportion to the combustion amount of the burner 100. At this time, the floor warming valve 13 of the low temperature water circulation circuit is closed.

[Floor-only operation] In the floor-only operation, heating operation is performed only by the floor heating panel 3. In the floor alone operation, the floor heating hot dash operation is performed according to the ON operation of the floor heating operation of the remote controller 4. Hereinafter, description will be made with reference to FIG. In the floor heating hot dash operation, first, the convection fan 200 of the indoor unit 2 is driven by a breeze for a predetermined time (several tens of seconds) (step 101), thereby causing convection of the indoor air. Then, the room temperature Tr is detected by the room temperature thermistor 405 provided in the indoor unit 2 (step 1
02).

The floor temperature is estimated by this detection, and the floor heating hot dash time tp (20 minutes to 3 hours) for continuously opening the floor heating valve 13 is calculated based on the temperature (step 103). . This floor heating hot dash time t
p is calculated to be shorter when the detected room temperature Tr is higher, and to be longer as the detected room temperature Tr is lower.

In the floor heating hot dash operation, the drive of the circulation pump 12 is started and the combustion of the burner 100 is started. During the floor heating hot dash time tp, the floor heating valve 13 is opened, and the combustion fan 101 and the proportional valve 104 are controlled so that the temperature detected by the high temperature water thermistor 401 becomes 80 ° C. (step 104). As a result, the hot water heated to 80 ° C. by the burner 100 continuously passes through the floor heating panel 3 for the floor heating hot dash time tp immediately after the start of operation and radiates heat. The capacity can be secured and the rise of the indoor temperature is improved.

After the floor heating hot dash time tp elapses (YES in step 105), the opening time and shutoff of the floor heating valve 13 are shut off according to the floor heating level set by the remote controller 4 from the seven stages. The ratio to the time is determined, and the floor warming valve 13 is controlled to open / close at the determined ratio (step 106). At this time, the combustion amount of the burner 100 is controlled so that the temperature detected by the low temperature water thermistor 402 is 60 ° C.

The ratio of the opening time and the shut-off time of the floor heating valve 13 is such that the opening time in a cycle of 20 minutes is 20 minutes at the maximum floor heating level, 3 minutes at the minimum floor heating level, and in that period. Underfloor heating level from 3 minutes to 2
The time between 0 minutes is set respectively. The floor warming valve 13 controls opening and closing by heat, and although it takes time to open and close, when the circulation of hot water is stopped, the hot water circulation circuit can be reliably closed by a large operating force. In the floor heating operation, the variable flow valve 14 is closed.

[Duet Heating Operation] In the duet heating operation, the indoor unit 2 and the floor heating panel 3 heat the room. In the duet heating operation, for the floor heating panel 3, the floor heating hot dash operation is controlled in the same manner as in the case of the floor single operation described above, and the combustion heat amount of the heating heat exchanger 11 is controlled as the combustion amount control after the burner 100 is ignited. The high-temperature water thermistor 401 provided on the outflow side detects the high-temperature water temperature, and the burner 1 adjusts the temperature to 80 ° C.
The combustion amount of 00 is feedback-controlled.

To control the hot water to the indoor unit 2, the necessary heat quantity Q to be released into the room is calculated based on the set temperature Ts of the remote controller 4 and the indoor temperature Tr detected by the room temperature thermistor 405 provided in the indoor unit 2. Then, the flow rate variable valve 14 is controlled so that the hot water flow rate L such that the required heat quantity Q is radiated by the heating heat exchanger 16 of the indoor unit 2 is obtained.

The amount of heat radiated in the heating heat exchanger 16 depends on the temperature difference between the inflow hot water temperature Tin flowing into the heating heat exchanger 16 and the outflow hot water temperature Tout flowing out from the heating heat exchanger 16, and From the flow rate L of the hot water flowing through the heat exchanger 16, Q = L * (Tin-Tout) is obtained by the equation 1, and therefore the flow rate L of the hot water is determined by the equation: L = Q / (Tin-Tout). Therefore, when the required heat quantity Q is calculated, if the inflow warm water temperature Tin and the outflow warm water temperature Tout are detected, the warm water flow rate L can be calculated by the above formula 2, and the detected flow rate detected by the water quantity sensor 18 is The flow rate variable valve 14 may be controlled so that the calculated hot water flow rate L is obtained.

The hot water temperature Tin flowing into the heating heat exchanger 16 is detected by the high temperature water thermistor 401, and the hot water temperature Tout flowing out is the indoor hot water thermistor 4 of the indoor unit 2.
Detected by 03. In addition, as described above, the burner 100 is controlled so that the inflow hot water temperature Tin becomes constant (80 ° C.).
Since the combustion amount of is controlled, when calculating the hot water flow rate L,
It is not necessary to detect the inflow hot water temperature again.

By the above control operation, the heating heat exchanger 1
6 can be controlled, and the heat exchanger 16 for heating the indoor unit 2 can be controlled.
It is possible to accurately control the amount of heat radiation, and to perform heating by the floor heating panel 3 at the same time, and even if the flow rate to the heating heat exchanger 16 is not stable, more accurate heating operation can be performed.

In each of the above operations, the burner 10
As the combustion control of 0, the pre-purge is performed by the combustion fan 101 according to the ON operation of each operation, and then the solenoid valves 102, 103 and the proportional valve 104 are controlled in a predetermined sequence to supply the fuel to the burner 100. Then, ignition control is performed to generate a spark discharge at the ignition electrode 105 and start combustion.
After detection of ignition by the flame rod 106, the combustion fan 101 and the proportional valve 104 are controlled to control the combustion amount of the burner 100. After the operation is completed, the burner 100
By stopping the operation of the circulation pump 12 two minutes after the combustion is stopped, the heating operation can be smoothly stopped by utilizing the residual heat.

The inverter control for driving the compressor 21 is performed by the compressor 2 during the cooling operation and each dry operation.
The rotational speed of 1 is controlled. In the above embodiment, the floor warming valve is shown as the shutoff valve, and the opening ratio is controlled by returning the duty ratio of ON and OFF. However, the opening ratio is changed by changing the energizing current using a proportional valve. May be controlled. Further, in the above embodiment, the heating capacity is adjusted by controlling the combustion amount of the burner during the heating only operation, but the temperature of the hot water is kept constant,
The heating capacity may be adjusted by controlling the circulation flow rate. It should be noted that the present invention can be applied to this case even if floor heating is not provided. Also,
Although the burner is shown as the heating source in the above embodiment, an electric heater may be used.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a hot water air conditioner system showing an embodiment of the present invention.

FIG. 2 is a flow chart for explaining a control operation in a floor single operation according to the embodiment of the present invention.

[Explanation of symbols]

2 Indoor unit (indoor heater) 4 Remote controller (room temperature setting means) 10 Hot water circuit (hot water circulation circuit) 12 Circulation pump 14 Flow rate variable valve 18 Water amount sensor (flow rate sensor) 100 Burner (heating source) 400 Control device (hot water heating system) Controller, required heat amount calculation means, flow rate calculation means, flow rate variable valve control means) 403 Indoor hot water thermistor (outflow hot water temperature detection means) 405 Room temperature thermistor (room temperature sensor)

Claims (1)

[Claims] 1. A hot water heating system in which an indoor heater installed in a room has a hot water circulation circuit for circulating hot water heated by a heating source at a constant temperature by a pump, and the flow rate of hot water in the hot water circulation circuit. A variable flow rate valve for adjusting the temperature, a room temperature setting means for setting a set temperature, a room temperature sensor for detecting an indoor temperature, an outflow hot water temperature detection means for detecting an outflow hot water temperature flowing out from the indoor heater, Necessary heat quantity calculating means for calculating the necessary heat quantity to be released by the indoor heater based on the temperature difference between the set temperature and the indoor temperature, and the necessary heat quantity and the outflow hot water temperature detecting means calculated by the necessary heat quantity calculating means. Flow rate calculating means for calculating the flow rate to be adjusted by the flow rate variable valve from the outflow hot water temperature of the indoor heater detected by A flow rate sensor for detecting an excessive hot water flow rate, and a flow rate variable valve control means for controlling the flow rate variable valve based on the calculated flow rate calculated by the flow rate calculation means and the detected flow rate of the flow rate sensor. Control device for hot water heating system.