JP2004125230A - Heating operation method of air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for performing interlocking operation of air conditioning operation and floor heating operation without making a person staying in a room feel a cold air feeling in an air conditioning system for arranging a water heat exchanger for heating a floor in the middle of a refrigerant circulating passage for circulating a delivery refrigerant from an air conditioning compressor between an indoor heat exchanger and an outdoor heat exchanger. <P>SOLUTION: Floor heating operation is started after an indoor temperature becomes a predetermined first preset temperature after starting air conditioning operation. Afterwards, even if the floor heating operation is started in air conditioning operation by controlling a hot water circulating flow rate for heating the floor so that a temperature of blowout hot air in a room does not become a predetermined second preset temperature or less, the interlocking operation of the air conditioning operation and the floor heating operation can be continued at a comfortable indoor temperature without lowering a temperature of hot air blown out in the room by an air conditioner up to a temperature for feeling the cold air feeling. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heating operation method in an air conditioning system provided with an air conditioner that blows out conditioned air into a room and a floor heating device that circulates hot water under the floor.
[0002]
[Prior art]
Conventionally, an air conditioning system including an air conditioner and a floor heating device and capable of performing an interlocking operation between the operation of the air conditioner and the operation of the floor heating device is known. Can be maintained at a comfortable temperature. In such an air conditioning system, the air conditioner includes an indoor unit having an indoor heat exchanger and the like, and a compressor, an outdoor unit having an outdoor heat exchanger and the like, and includes an indoor heat exchanger and an outdoor heat exchanger. In the meantime, a refrigerant circulation path for circulating refrigerant discharged from the compressor is formed.In cooling, the indoor heat exchanger functions as an evaporator, and the outdoor heat exchanger functions as a condenser. The exchanger functions as a condenser, and the outdoor heat exchanger functions as an evaporator.
[0003]
In addition, the floor heating device includes a hot water circulation path and a circulation pump, and a water heat exchanger connected in parallel with the indoor heat exchanger of the air conditioner, and discharges refrigerant discharged from the outdoor compressor to the water heat exchanger. The hot water is heated by condensing in an exchanger and evaporating in an outdoor heat exchanger.
[0004]
In such an air conditioning system, the heat capacity on the floor heating side is large, and it takes a long time for the floor surface to reach the set temperature. Previously, a method of starting a floor heating operation by a floor heating device was adopted. However, in order to start the heating operation by this method, the user needs to set a desired time in advance, and if this time setting is forgotten, the linked operation of the air conditioning operation and the floor heating operation is not started. If it is desired to warm the room earlier than the set time, it is necessary to use an air conditioner to warm the room quickly.However, in the above air conditioning system, when the simultaneous operation of the air conditioning operation and the floor heating operation is started, the water heat exchange There is a problem that the amount of condensation in the heat exchanger becomes large, most of the compression function power is supplied to the water heat exchanger, and the heating capacity on the indoor heat exchanger side becomes insufficient.
[0005]
To cope with this problem, in an air conditioning system as described above in which an indoor heat exchanger of an air conditioner and a water heat exchanger of a floor heating device are arranged in parallel (hereinafter referred to as a parallel air conditioning system), air conditioning operation and floor heating are performed. An air conditioning system has been proposed in which the amount of hot water circulating on the floor heating device side is controlled so as to increase the capacity of the air conditioning device side at the start of the interlocking operation of the operation so as to quickly raise the indoor air temperature (for example, Patent Document 1).
[0006]
[Patent Document 1]
JP-A-2002-130776 (paragraphs 0006-0007)
[Patent Document 2]
Japanese Patent Application No. 2002-92742
[Problems to be solved by the invention]
By the way, in the air conditioning system described in Patent Literature 1, the water heat exchanger of the floor heating device that circulates the refrigerant discharged from the compressor of the outdoor unit and functions as a condenser is parallel to the indoor heat exchanger of the air conditioner. Connected to the compressor. For this reason, a device for controlling the amount of refrigerant distributed in parallel and the control thereof are required, resulting in an increase in cost. Also, the control becomes complicated.
[0008]
On the other hand, a water heat exchanger of a floor heating device is provided in the middle of a refrigerant circulation path of an air conditioner, and an air conditioning system in which a water heat exchanger and an indoor heat exchanger are connected in series (hereinafter, also referred to as a series air conditioning system). There is an air conditioning system filed by the present applicant as Patent Document 2. This series air conditioning system includes an indoor unit having an indoor heat exchanger and the like, and an outdoor unit having a compressor, an outdoor heat exchanger and the like, and exchanges refrigerant discharged from the compressor with the indoor heat exchanger and the outdoor heat exchanger. A water heat exchanger for a floor heating device is provided in the middle of a refrigerant circulation path circulating between units.
In the case of such a series air conditioning system, the structure and control of the device are simple and the cost is low because the distribution of the refrigerant amount is not required.
[0009]
However, if the floor heating operation is started during the heating by the air conditioning operation, the temperature of the water heat exchanger temporarily decreases, and the temperature of the warm air blown into the room temporarily decreases. When the temperature of the warm air blown out during indoor heating decreases, the feeling of cool air perceived by the person in the room is subtle, and when the temperature of the warm air drops to about 38 ° C, which is slightly higher than the body temperature, the person is exposed to cold air. It is said that you feel a feeling. For this reason, the method of performing the floor heating operation after starting the air-conditioning operation is avoided, and the floor heating operation is performed before the air-conditioning operation is started, resulting in a problem that the operation cost of the outdoor unit increases.
[0010]
The present invention provides a method for performing an interlocking operation between an air conditioning operation and a floor heating operation without feeling the feeling of cool air in a room in a series air conditioning system.
[0011]
[Means for Solving the Problems]
The heating operation method of the air conditioning system according to the present invention is characterized in that, in a refrigerant circulation path for circulating refrigerant discharged from an air conditioning compressor between an indoor heat exchanger and an outdoor heat exchanger, water heat exchange for floor heating is performed. An interlocking operation method of an air conditioning operation and a floor heating operation in an air conditioning system provided with a heater, wherein the floor heating operation is started after the indoor temperature reaches a predetermined first set temperature after the air conditioning operation is started, The hot water circulation flow rate for floor heating is controlled so that the temperature of the hot air blown into the room does not become lower than or equal to a predetermined second set temperature.
[0012]
In the room heating operation according to the method of the present invention, the point that the floor heating operation is started after the air conditioning operation is started and the room temperature reaches a certain temperature (first set temperature) is the same as the conventional operation method. However, the operation control after the start of the floor heating operation is different from the conventional operation.
That is, in the heating operation method of the present invention, the floor heating is performed so that the temperature of the warm air blown into the room by the air conditioner by the floor heating operation does not drop below the temperature at which a feeling of cool air is felt (the second set temperature). To control the hot water circulation flow. With this, even if the floor heating operation is started during the air conditioning operation, the person in the room can continue the interlocking operation of the air conditioning operation and the floor heating operation at a comfortable room temperature without feeling the feeling of cool air. .
[0013]
Here, the temperature of the indoor heat exchanger, the temperature of the hot air blown out, and the like are controlled so that the temperature of the hot air blown into the room does not become lower than the temperature at which a feeling of cool air is felt (the second set temperature). Can be adopted as If the temperature of the hot air blown into the room is about 38 ° C. or higher, the person does not feel a feeling of cold wind, so the temperature of the indoor heat exchanger, the temperature of the hot air blown out, etc. These temperatures are measured experimentally during floor heating operation, the flow rate of hot water circulation for floor heating is increased or decreased according to the measurement result, and the temperature of hot air blown into the room is The temperature is controlled so that it does not become lower than the temperature at which the user feels.
[0014]
The control of the hot water circulation flow rate for floor heating may employ a control method of increasing or decreasing the hot water circulation flow rate by controlling the rotation speed of a circulation pump, ON-OFF control, or opening and closing control of a flow control valve in the middle of the pipe. it can. When the temperature of the indoor heat exchanger, the temperature of the blown hot air, etc. fall below the set temperature, the amount of condensation in the water heat exchanger is reduced by reducing the hot water circulation flow rate, thereby increasing the capacity of the air unit side. Since the temperature can be increased, the temperature of the hot air blown into the room is controlled so as not to be lower than the temperature at which a feeling of cool air is felt.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a diagram illustrating a schematic configuration of an air conditioning system according to an embodiment of the present invention. Although the air-conditioning system according to the present embodiment can perform the cooling operation in the summer, the case of the heating operation in the winter will be described here.
[0016]
The air conditioner includes an indoor unit 10 having an indoor heat exchanger 11 and a blower fan 12, and an outdoor unit 20 having a compressor 21, an outdoor heat exchanger 22, and a fan 23. A refrigerant circulation path 30 for circulating refrigerant discharged from the compressor 21 is provided between the heat exchanger 22 and the outdoor heat exchanger 22 during heating, and the indoor heat exchanger 11 functions as a condenser during heating. The air is blown into the room by the blower fan 12.
[0017]
In the present embodiment, the outdoor unit 20 includes a floor heating water heat exchanger 41, a water supply tank 42, and a circulation pump 43 that transmit the heat of condensation of the refrigerant to the heat medium, and is provided on the floor of the building. The floor heating device is constituted by the panel 40, the water heat exchanger 41, and the hot water circulation path 44 through which hot water circulates between the water supply tank 42. In the figure, 24 is an electronic expansion valve, 25 is a strainer, 26 is a muffler, 27 is a check valve, 28 is a four-way valve, 45 is a hot water outlet, and these devices are devices known as an air conditioning system. Therefore, description of functions and the like is omitted.
[0018]
In a series air conditioning system in which a water heat exchanger 41 for floor heating is provided in the middle of a refrigerant circulation path 30 for air conditioning as in this air conditioning system, hot air from a compressor 21 having a limited capacity is used for air conditioning and heating. When the floor heating operation is started during the air conditioning operation, the temperature of the warm air supplied to the indoor air conditioner 11 decreases, and the temperature of the warm air blown into the room decreases when the floor heating operation is started during the air conditioning operation. You will feel a cool breeze.
[0019]
Therefore, in the present embodiment, a thermistor 50 as a temperature sensor is attached near the hot air outlet side of the indoor heat exchanger 11, and the number of revolutions of the circulation pump 43 is controlled in accordance with the output signal of the thermistor 50 to control the floor heating panel 40. Adjust the flow rate of hot water to circulate through. The relationship between the temperature of the indoor blown hot air and the output signal of the thermistor 50 is experimentally determined in advance, and the output signal level of the thermistor 50 that can maintain the temperature of the indoor blown hot air so that it does not feel a cool wind is set. Thereby, even if the floor heating operation is started during the air conditioning operation, the air conditioning operation and the floor heating operation can be continued without feeling the feeling of cool air in the room.
[0020]
FIG. 2 is a diagram showing changes in the temperature of the indoor heat exchanger and the temperature of the blown hot air and changes in the output of the circulation pump when the present invention is implemented. In the figure, the horizontal axis indicates time, t1 indicates the start time of the air conditioning operation, and t2 indicates the start time of the floor heating operation. The vertical axis indicates the temperature of the indoor heat exchanger, the temperature of the blown hot air, and the output of the circulation pump.
[0021]
As shown in FIG. 2, the air-conditioning operation is started at time t1, and floor heating is started at time t2 when the output signal level of the thermistor 50 reaches a set value (the temperature of the indoor heat exchanger 11 is 40 ° C.). Thereafter, if the output signal level of the thermistor 50 is equal to or higher than the set value, the output of the circulating pump 43 for floor heating is increased, and if the output signal level of the thermistor 50 becomes lower than the set value, the output of the pump 43 for floor heating is changed. By decreasing the temperature, the temperature of the warm air blown into the room is turned to a temperature rise before decreasing to a temperature (38 ° C.) at which a feeling of cool air is felt, and thereafter the temperature changes to a temperature close to 40 ° C. As described above, as a result of performing the heating operation based on the method of the present invention, the warm air blown into the room does not drop below the temperature at which a feeling of cool air is felt, and the room temperature stably changes.
[0022]
【The invention's effect】
Air conditioning operation and floor heating in an air conditioning system in which a water heat exchanger for floor heating is provided in the middle of a refrigerant circuit that circulates refrigerant discharged from a compressor for air conditioning between an indoor heat exchanger and an outdoor heat exchanger In the interlocking operation of the operation, the floor heating operation is started after the indoor temperature reaches the first predetermined temperature after the start of the air conditioning operation, and thereafter, the temperature of the hot air blown into the room is changed to the second predetermined temperature. Even if the floor heating operation is started during the air-conditioning operation, the temperature of the warm air blown into the room by the air-conditioner feels a cool air feeling by controlling the circulation flow rate of the hot water for the floor heating so that the temperature does not become lower than the set temperature. The interlocking operation of the air conditioning operation and the floor heating operation can be continued at a comfortable room temperature without lowering the temperature.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a schematic configuration of an air conditioning system according to an embodiment of the present invention.
FIG. 2 is a diagram showing changes in the temperature of an indoor heat exchanger, the temperature of blown hot air, and changes in the output of a circulation pump when the present invention is implemented.
[Explanation of symbols]
REFERENCE SIGNS LIST 10 indoor unit 11 indoor heat exchanger 12 blower fan 20 outdoor unit 21 compressor 22 outdoor heat exchanger 23 fan 24 electronic expansion valve 25 strainer 26 muffler 27 check valve 28 four-way valve 30 refrigerant circulation path 40 floor heating panel 41 water heat Exchanger 42 Water supply tank 43 Circulation pump 44 Hot water circulation path 45 Hot water outlet 50 Thermistor

Claims (1)

Air-conditioning operation and floor heating in an air-conditioning system in which a water heat exchanger for floor heating is provided in the middle of a refrigerant circuit for circulating refrigerant discharged from a compressor for air conditioning between an indoor heat exchanger and an outdoor heat exchanger An interlocking operation method of an operation, wherein a floor heating operation is started after a room temperature reaches a predetermined first set temperature after an air-conditioning operation is started, and thereafter, a temperature of hot air blown into the room is predetermined. A heating operation method for an air conditioning system, comprising controlling a flow rate of hot water circulation for floor heating so that the temperature does not fall below a second set temperature.

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