JPH10148379A - Radiation air-conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation air-conditioning system to achieve saving of energy by preventing cooling of a heat radiation panel during the starting of operation of a heating mode. SOLUTION: A bypass circuit 27 to perform control of the passage and disconnection of a refrigerant by opening and closing a solenoid valve 26 is arranged between the delivery side of a compressor 2 to form a refrigerating cycle and a connection route between a pressure reducing means 8 and a heat-exchanger 6 on the heat source side. The temperature of a refrigerant on the delivery side of the compressor 2 is detected by a temperature sensor 31. A control means 30 to control a refrigerating cycle causes bypass of a refrigerant, intended to flow to a heat radiation panel 6 as a heat-exchanger on the utilization side, by releasing the solenoid valve 26 during a time in which the detecting value of the temperature sensor 31 attains a given value from a starting during heating operation. Further, the increase of the temperature of a refrigerant on the delivery side of the compressor 2 is expedited in a way that a fan 18 on the heat source side is stopped during release of the solenoid valve 26 of the bypass circuit 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiant air conditioning system in which a heat radiating panel is installed on a ceiling or a wall, and air conditioning is performed using heat radiation from the radiating panel.

[0002]

2. Description of the Related Art In general, a use side unit of a separation type air conditioner is provided with a use side heat exchanger and a use side fan, and discharges heat exchanged air in a direction convenient for convection to make the whole use side. Air conditioning. In recent years, a radiant air conditioning system has been developed in which the use-side unit is formed in a panel shape, the use-side fan is removed, and air conditioning is performed by heat radiation from the heat radiation panel. This radiant air conditioning system can perform not only a heating operation combined with heat radiation but also a cooling operation.

[0003]

However, when the radiant air-conditioning system is operated for heating in cold weather, the refrigerant that has accumulated in the heat source side unit at the start of operation is conveyed to the heat radiating panel by the compressor and used up to that time. There is a problem that the heat radiation panel kept at the side temperature is temporarily cooled. As a result, at the start of the heating operation, the same operation as in the cooling operation is performed, which delays a rise in the temperature of the heat radiation panel and wastes energy.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a radiant air conditioning system capable of achieving energy saving by preventing temporary cooling of a heat radiation panel at the time of starting a heating operation. The purpose is to:

[0005]

According to a first aspect of the present invention, there is provided a radiant air conditioning system in which a compressor, a heat radiating panel as a use side heat exchanger, a pressure reducing means, and a heat source side heat exchanger are sequentially connected. A bypass circuit branched from a discharge side of the compressor and connected to a refrigerant pipe between the pressure reducing means and the heat source side heat exchange, a shutoff valve provided in the bypass circuit, and a temperature of refrigerant discharged from the compressor. And a control means for opening the shut-off valve until the detected value of the temperature sensor reaches a predetermined value from the start during operation in the heating mode.

[0006] By closing the shut-off valve of the bypass circuit, the warm refrigerant flows to the heat radiating panel, so that the cooling of the heat radiating panel at the start of the heating operation can be prevented, and the effect of energy saving can be obtained.

A radiant air conditioning system according to a second aspect of the present invention is a radiant air conditioning system in which a compressor, a heat radiating panel as a use side heat exchanger, a pressure reducing means, and a heat source side heat exchanger are sequentially connected. A bypass circuit branched from the side and connected to a refrigerant pipe between the pressure reducing means and the heat source side heat exchange, an electromagnetic valve provided in the bypass circuit, and a temperature sensor for detecting a temperature of refrigerant discharged from the compressor. Control means for opening the solenoid valve from startup during operation in the heating mode until the detection value of the temperature sensor reaches a predetermined value, and stopping operation of the heat source side fan of the heat source side heat exchanger. It is characterized by having.

Since the heat source side fan is stopped when the solenoid valve of the bypass circuit is opened, the temperature rise of the refrigerant on the discharge side of the compressor can be accelerated.
Energy saving effect can be enhanced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the drawings.

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention. In FIG. 1, the compressor 2 forms a refrigeration cycle by a four-way valve 4, a radiant panel 6 as a use side heat exchanger, a capillary tube 8 as a pressure reducing means, and a heat source side heat exchanger 10. During the heating operation, the four-way valve 4 forms a path indicated by a solid line, and the refrigerant discharged from the compressor 2 circulates in the direction of the solid line arrow. At this time, the radiation panel 6 functions as a condenser, and the heat source side heat exchanger 10 functions as an evaporator.

On the other hand, during the cooling operation, the four-way valve 4 forms a path shown by a broken line, and the refrigerant discharged from the compressor 2 circulates in the direction of the broken line arrow. At this time, the heat source side heat exchanger 10
Functions as a condenser, and the radiation panel 6 functions as an evaporator.

An accumulator 12 for gas-liquid separation is provided on the refrigerant suction side of the compressor 2 to prevent vapor having a high degree of wetness from being sucked into the compressor 2. Also,
An AC having a variable voltage and a variable frequency is supplied to a compressor motor 14 that drives the compressor 2 via an inverter 16, and the compressor 2 is configured to control its capacity. On the other hand, in order to promote heat exchange of the heat source side heat exchanger 10, a heat source side fan 18 driven by a heat source side fan motor 20 is provided.

[0013] Of the components constituting the refrigeration cycle,
The radiating panel 6 is provided on the use side X, and all other components are provided on the heat source side Y.

In this case, the use side pipe and the heat source side pipe are
They are connected via service valves 22 and 24, respectively. On the heat source side Y, an electromagnetic valve (“interruption”) is provided between the connection path of the four-way valve 4 and the service valve 24 corresponding to the discharge side of the compressor 2 and the connection path of the capillary tube 8 and the heat source side heat exchanger 10. A bypass circuit 27 for refrigerant having a "valve") 26 is provided. A temperature sensor 31 for detecting the temperature of the refrigerant is provided on the discharge side of the compressor 2.
Is provided, and a temperature sensor 3 for detecting room temperature is provided on the use side X.
2 are provided.

Each detection signal of these temperature sensors 31 and 32 is applied to a controller (control means) 30 for controlling a refrigeration cycle. This control means 30 has a function of switching the four-way valve 4 according to the operation mode,
A function of applying a frequency command to the inverter 16 for controlling the capacity of the compressor motor 14 in accordance with the detected temperature value of the air conditioner, that is, a function of controlling the rotation speed of the heat source side fan motor 20; And a function of controlling the solenoid valve 26 connected to the bypass circuit 27 in accordance with the detected value of.

The control means 30 has a built-in MPU (microcomputer), driver and the like for realizing each of these functions, and outputs an operation command according to a predetermined processing procedure. However, the switching of the four-way valve 4, the command frequency for the inverter 16, and the determination of the number of revolutions of the heat source side fan motor 20 have been proposed. Will be described below with reference to FIGS. 2 and 3.

In the present embodiment, when performing the heating operation of the refrigeration cycle shown in FIG. 1, the solenoid valve 26 is opened and the flow to the heat radiation panel is started from the start until the detected value of the temperature sensor 31 reaches, for example, 25 ° C. After the refrigerant to be bypassed reaches 25 ° C., after the temperature reaches 25 ° C., the electromagnetic valve 26 is closed to allow the warm refrigerant to flow to the radiating panel 6, and the heat source side fan motor 20 is stopped while the electromagnetic valve 26 is open. Perform

FIG. 2 is a flowchart showing a specific processing procedure of the MPU for performing this control. That is, in step 101, it is determined whether the operation mode is heating. If it is heating, the process from step 102 is executed. If not, the process in the cooling operation mode without details is executed in step 110. I do. If it is determined in step 101 that the operation mode is heating, a start command for the compressor 2, that is, a frequency command for the inverter 16 is output in the next step 102, and then, in step 103, the heat source side is output. A stop command for the fan motor 20 is output.

Next, at step 104, the bypass circuit 27
A command to open (energize) the electromagnetic valve 26 is output, and in the next step 105, the detection value of the temperature sensor 31, that is,
The temperature Tc of the discharge side refrigerant of the compressor is read.

Next, at step 106, the refrigerant temperature Tc
Is determined to exceed a predetermined threshold value Teref, for example, 25 ° C., and if so, the processing of step 107 and subsequent steps is executed. If not, the processing of steps 105 and 106 is repeatedly executed. . Thus, the refrigerant temperature Tc
Is greater than the threshold Teref, at step 107, the command to open the solenoid valve 26 is released, and then at step 108, the command to stop the heat source side fan motor 20 is released.

Finally, in step 109, it is determined whether or not a command to stop the operation has been externally applied. If the command has been received, the process is terminated.
7 Repeat the following process.

FIG. 3 is a diagram showing the relationship between the temperature of the radiant panel 6 and the time when the above-described control is executed, in comparison with that of the conventional apparatus.

Assume that the outside air temperature at the start of operation is To, and the room temperature at that time is Ti (for example, 25 ° C.). In the conventional apparatus, as shown by a dashed curve P, the temperature kept at room temperature Ti until the operation start time t1 gradually decreases immediately after the start of operation, and at time t2 coincides with the outside air temperature To. The effect of heating operation appears and gradually rises.
On the other hand, in this embodiment, as shown by the solid curve Q, even if the operation is started at time t1, the room temperature T is maintained for a while.
Since the refrigerant is kept at i, and thereafter, the refrigerant substantially equal to the room temperature Ti is supplied to the radiating panel 6, it does not drop below the room temperature Ti, and thereafter rises to a predetermined temperature by the heating operation.

According to the present embodiment, even if the heating operation is performed in cold weather, it is possible to prevent the same operation as in the cooling operation from being performed temporarily at the start of operation, thereby achieving energy saving. it can.

In the above embodiment, the bypass circuit 27
Of the heat source side fan 1
8, the temperature of the refrigerant discharged from the compressor 2 can be increased at an early stage. However, considering that the heating effect of the radiant air conditioning system takes a long time, the heat source side fan 18 is intentionally stopped. Even without this, a considerable energy saving effect can be obtained.

In the above embodiment, the refrigerant is bypassed until the detection value of the temperature sensor 31 exceeds a preset reference value. However, even if the room temperature detected by the temperature sensor 32 is adopted as the reference value, the same as described above is applied. The effect can be obtained. Although the capillary tube 8 is connected between the radiant panel 6 and the heat source side heat exchanger 10, it goes without saying that an expansion valve may be used instead.

[0027]

As is apparent from the above description, according to the present invention, during the heating operation, the refrigerant flowing to the heat radiation panel until the refrigerant temperature on the discharge side of the compressor reaches a predetermined value. After the bypass is reached and the predetermined value is reached, the bypass circuit is shut off to allow the warm refrigerant to flow to the heat radiating panel, so that cooling of the heat radiating panel at the start of operation can be prevented, thereby saving energy. Is obtained.

Further, by stopping the heat-source-side fan in conjunction with opening of the bypass circuit, the temperature of the refrigerant on the discharge side of the compressor can be quickly increased, and the energy saving effect can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a control unit of the embodiment shown in FIG.
4 is a flowchart illustrating a processing procedure of a PU (microcomputer).

FIG. 3 is a diagram showing a relationship between temperature and time for explaining an operation of the embodiment shown in FIG. 1 in comparison with a conventional device.

[Explanation of symbols]

 2 Compressor 4 Four-way valve 6 Radiating panel 8 Capillary tube 10 Heat source side heat exchanger 14 Compressor motor 16 Inverter 18 Heat source side fan 20 Heat source side fan motor 26 Solenoid valve (cutoff valve) 30 Control means 31, 32 Temperature sensor

Continuation of front page (72) Inventor's Agency Masayuki 2-5-1, Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (2)

[Claims] 1. A radiant air-conditioning system in which a compressor, a heat radiating panel as a use side heat exchanger, a pressure reducing means, and a heat source side heat exchanger are sequentially connected. A bypass circuit leading to a refrigerant pipe between the heat source side heat exchange,
A shut-off valve provided in the bypass circuit, a temperature sensor for detecting the temperature of the refrigerant discharged from the compressor, and the shut-off valve until the detection value of the temperature sensor reaches a predetermined value from startup during operation in a heating mode. A radiant air conditioning system, comprising: a control unit for opening the radiant air conditioning system. 2. A radiant air-conditioning system in which a compressor, a heat radiating panel as a use side heat exchanger, a pressure reducing means, and a heat source side heat exchanger are sequentially connected. A bypass circuit leading to a refrigerant pipe between the heat source side heat exchange,
An electromagnetic valve provided in this bypass circuit, a temperature sensor for detecting the temperature of the refrigerant discharged from the compressor, and the electromagnetic valve from startup during operation in a heating mode until the detection value of the temperature sensor reaches a predetermined value. Control means for opening and stopping operation of the heat source side fan of the heat source side heat exchanger.