JPH06123452A - Radiant cooling device - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a radiant cooling device capable of preventing the occurrence of dew condensation on a ceiling panel and the disturbance of the effect of radiant cooling depending on the location. [Composition] One flow path of a four-way valve 2 is connected to the discharge side of a refrigerant pump 1, another flow path is connected to a suction side of the refrigerant pump 1 via a refrigerant-refrigerant heat exchanger 8, and the remaining two flow paths are connected. One is connected to the inlet of the radiant cooling heat exchanger 3, the other is connected to the inlet of the cold storage heat exchanger 6, and the discharge side of the refrigerant pump 1 and the radiant cooling heat exchanger 3 are connected. Alternatively, the heat exchanger 6 for cold storage is switched and connected, and at the same time, the suction side of the refrigerant pump 1 and the heat exchanger 6 for cold storage or the heat exchanger 3 for radiation cooling cool the refrigerant-to-refrigerant heat exchanger 8 The circuit of the four-way valve 2 is configured so as to be switched and connected via, and the outlet of the heat exchanger 3 for radiation cooling is connected to the outlet of the heat exchanger 6 for cold storage via a check valve 5. In addition, the outlet of the heat exchanger 6 for cold storage is connected to the four-way valve 2
The radiant cooling device is configured to be connected to a pipe between the refrigerant and the refrigerant-to-refrigerant heat exchanger 8 via an opening / closing valve 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device utilizing radiation.

[0002]

2. Description of the Related Art A radiant cooling device is conventionally known as a method for realizing a milder cooling. The conventional radiant cooling apparatus has a piping pipe arranged on the ceiling surface, and one for circulating cold water inside the cooling pipe, or a cooling medium piping for cooling the ceiling surface by evaporating the refrigerant there. The heat radiation from the human body in the room is taken away by the radiation to provide a comfortable cooling without a draft feeling.

[0003]

However, in the conventional radiant cooling apparatus that utilizes a refrigerant, the refrigerant is pumped and evaporated in the radiant cooling heat exchanger.
Most have a simple circulation circuit that condenses the returning refrigerant gas using another refrigerator, etc. and turns it into a liquid again.To perform radiation cooling, always operate another refrigerator. However, it was not satisfactory in terms of equipment efficiency and electricity charges.

Further, in the radiant cooling heat exchanger,
Although the refrigerant has a property of having a constant temperature in the latent heat generation section, the temperature decreases from upstream to downstream due to pressure loss, and dew condensation occurs on the downstream side. Further, in order to send the refrigerant stably, the refrigerant at the pump inlet needs to be in a liquid state, so the refrigerant liquid is supercooled and the temperature becomes low, and dew condensation occurs on the inlet side of the ceiling surface. Was.

The present invention is intended to solve the problems of the conventional radiant cooling apparatus, and can be realized by switching the radiant cooling operation, the cold storage operation, the radiant cooling operation using cold storage by a simple circuit configuration. It is an object of the present invention to provide a radiation cooling device that can solve the above problems.

[0006]

To achieve the above object, the present invention provides a refrigerant pump, a four-way valve, a radiant cooling heat exchanger,
A heat exchanger for cold storage, a refrigeration cycle having a refrigerant-to-refrigerant heat exchanger provided with a refrigerator as a main component is connected, and one flow path of the four-way valve and the discharge side of the refrigerant pump are connected to each other, and another flow path is connected. And the suction side of the refrigerant pump is connected via a refrigerant-to-refrigerant heat exchanger, one of the remaining two flow paths is connected to the inlet of the radiation cooling heat exchanger, and the other of the cold storage heat exchanger. The inlet side is connected, and the discharge side of the refrigerant pump and the radiation cooling heat exchanger or the cold storage heat exchanger are switched and connected, and at the same time, the suction side of the refrigerant pump and the cold storage heat exchanger or the radiation are connected. The cooling exchanger configures a four-way valve circuit so as to be switched and connected via the refrigerant-refrigerant heat exchanger, and the outlet of the radiant cooling heat exchanger is connected to the cool storage via a check valve. Connected to the outlet of the heat exchanger for
Further, the radiant cooling apparatus is configured such that the outlet of the heat exchanger for cold storage is connected to a pipe between the four-way valve and the refrigerant-refrigerant heat exchanger via an on-off valve.

[0007]

In such a radiant cooling apparatus, a refrigerant-refrigerant heat exchanger is used as a condenser and a condensate is cooled by a refrigerant pump by simply operating the refrigerant pump and switching the four-way valve and the on-off valve. Radiant cooling operation using a refrigerator that uses the heat exchanger for radiant cooling as an evaporator, cold storage operation that uses the refrigerant-refrigerant heat exchanger as a condenser and the heat storage heat exchanger as an evaporator, heat exchange for cold storage The radiant cooling operation using the regenerator with the condenser as the condenser and the radiant cooling heat exchanger as the evaporator can be performed with a simple configuration. By using the cold heat to perform radiant cooling, or by controlling the operation of the refrigerator according to the temperature of the regenerator, it is possible to perform radiant cooling operation using the refrigerator even when the cold heat disappears. , Convenient radiant cooling Location can be realized.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an embodiment of a radiant cooling device according to the present invention, which is a circuit diagram of a refrigeration cycle.

1, a refrigerant pump 1 is provided with a four-way valve 2 on its discharge side, and one passage of the four-way valve 2 is connected to an inlet of a radiant cooling heat exchanger 3. Here, the radiant cooling heat exchanger 3 is composed of one continuous pipe,
It is attached to the ceiling panel 4. Further, the outlet thereof is connected to the heat exchanger 6 for cold storage via the check valve 5 and further constitutes a circuit for returning to one flow path of the four-way valve 2. The heat exchanger 6 for cold storage is installed in the cold storage tank 7 and can exchange heat with the cold storage agent (water, brine, etc.) inside the cold storage tank 7.

The suction side of the refrigerant pump 1 is connected to one flow path of the four-way valve 2 via a refrigerant-refrigerant heat exchanger 8. In the refrigerant-refrigerant heat exchanger 8, the refrigerant in the refrigeration cycle and the cooling circuit 1 cooled by the refrigerator 9 are used.
It is possible to indirectly exchange heat with 0.

Here, by switching the four-way valve 2, the discharge side of the refrigerant pump 1 is switched to and connected to the radiant cooling heat exchanger 3 or the cold storage heat exchanger 6 through the four-way valve 2, and at the same time, the refrigerant pump 1 is connected. The suction side is configured to be connected to the cold storage heat exchanger 6 or the radiant cooling heat exchanger 3 via the four-way valve 2 and the refrigerant-to-refrigerant heat exchanger 8.

A pipe between the check valve 5 and the heat exchanger 6 for cold storage and a pipe between the four-way valve 2 and the refrigerant-refrigerant heat exchanger 8 are connected via an on-off valve 11. Furthermore, cool storage tank 7
The temperature sensor 12 provided inside the control unit 13 controls the controller 13 to start the operation of the refrigerator 9 when the temperature of the cold storage agent is equal to or higher than the set temperature.

In the radiant cooling apparatus, during the cold storage operation, the temperature sensor 12 detects the temperature of the cold storage agent inside the cold storage tank 7, and if the temperature is equal to or higher than the set temperature, the controller 13 operates the refrigerator 9. In this case, the four-way valve 2 is connected in the direction of the broken line, and the opening / closing valve 11 is opened. In this case, the refrigerant of the refrigeration cycle flows from the refrigerant pump 1 to the four-way valve 2 to the heat exchanger 6 for cold storage, to the open / close valve 11 to the heat exchanger 8 for refrigerant to refrigerant 8 to the refrigerant pump 1, and to the heat exchanger 6 for cold storage to store the cold storage tank. 7 cools the regenerator inside, evaporates itself, and indirectly liquefies by indirectly exchanging heat with the cooling circuit 10 cooled by the operation of the refrigerator 9 and the refrigerant-refrigerant exchanger 8. In this way, the cool storage agent in the cool storage tank 7 is cooled and stored cold. At this time, the check valve 5 prevents the liquid refrigerant from flowing into the radiant cooling heat exchanger 3, and the side connected to the four-way valve 2 is in the refrigerant gas state, so that the ceiling panel 4 is cooled. There is no such thing.

During the radiant cooling operation, the four-way valve 2 is connected in the direction of the solid line and the on-off valve 11 is closed. Temperature sensor 12
Detects the temperature of the cold storage agent inside the cold storage tank 7, and if the temperature is equal to or higher than the set temperature, the controller 13 operates the refrigerator 9,
If it is below the set temperature, the refrigerator 9 is not operated. At this time, the flow of the refrigerant is such that the refrigerant pump 1 → the four-way valve 2 → the radiant cooling heat exchanger 3 → the check valve 5 → the regenerator heat exchanger 6 → the four-way valve 2 →
Refrigerant-to-refrigerant heat exchanger 8 → refrigerant pump 1 flows, and in heat exchanger 3 for radiant cooling, for example, absorbs heat in the room through ceiling panel 4, contributes to radiant cooling, and evaporates itself. If the temperature of the cold storage agent is equal to or lower than the set temperature, heat is radiated to the cold storage agent stored in the cold storage tank 7 in the cold storage heat exchanger 6 to liquefy itself, and the liquefied refrigerant is the four-way valve 2,
Although passing through the refrigerant-to-refrigerant heat exchanger 8, the refrigerator 9 is sucked into the refrigerant pump 1 as it is because the refrigerator 9 is not operated by the controller 13. On the other hand, if the temperature of the regenerator is equal to or higher than the set temperature, heat cannot be sufficiently radiated to the regenerator in the heat exchanger 6 for regenerator and is not liquefied. Inflow to 8. Here, since the refrigerator 9 is operated by the controller 13,
Heat is exchanged between the cooling circuit 10 and the refrigerant-to-refrigerant heat exchanger 8, and the liquid itself is liquefied and drawn into the refrigerant pump 1.

As described above, the cold storage operation and the cold storage use radiation are performed with a simple structure, and only by the simple operation of switching the four-way valve 2 and the opening / closing valve 11 and controlling the operation of the refrigerator 9 by the temperature of the cold storage agent. Cooling operation and radiant cooling operation using a refrigerator can be realized. For example, cheap midnight power is used to store cold at night, and the cold heat is used during daytime to perform radiative cooling, or it is frozen by the temperature of the cold storage agent. By controlling the operation of the machine 9, a radiant cooling operation using the refrigerator 9 is possible even when the cold heat is exhausted, and thus a highly convenient cooling device can be realized.

Although not shown in this embodiment, the radiation cooling is performed by indirectly exchanging heat between the piping between the four-way valve 2 and the radiation cooling heat exchanger 3 and the outlet piping of the check valve 5. Even if the refrigerant flowing into the heat exchanger 3 for heat is supercooled, the temperature rises due to heat absorption by the high-temperature gas or the two-phase refrigerant leaving the check valve 5, so that the temperature of the radiant cooling heat exchanger 3 is increased. The temperature of the ceiling panel 4 can be made uniform without lowering the temperature on the inlet side, and the occurrence of dew condensation can be prevented.

Further, although not shown in this embodiment, when a non-azeotropic mixed refrigerant is used as the refrigerant of the refrigeration cycle, the pressure in the radiant cooling heat exchanger 3 is increased due to the characteristic of temperature rise in the evaporation process. Even if the loss increases, the temperature difference can be minimized at the entrance and exit of the ceiling panel 4
The temperature can be made uniform, and the occurrence of dew condensation and the disturbance of the effect of radiant cooling depending on the location can be prevented.

[0018]

As will be apparent from the above description of the embodiments, the radiant cooling / heating apparatus according to the present invention is operated by a radiant cooling system using a refrigerator only by a simple operation of operating a refrigerant pump and switching a four-way valve and an on-off valve. The cold storage operation and the radiant cooling operation using the cold storage can be performed with a simple configuration.

Further, by controlling the operation of the refrigerator according to the temperature of the regenerator, a radiant cooling operation using the refrigerator can be performed even when the cold heat is exhausted, and a highly convenient air conditioner is realized. it can.

More preferably, the temperature of the radiant cooling heat exchanger is controlled by exchanging heat between the inlet and outlet pipes of the radiant cooling heat exchanger or by using a non-azeotropic mixed refrigerant as the refrigerant flowing in the refrigeration cycle. Since it can be made almost constant, it has a great effect in practical use such as the occurrence of dew condensation on the ceiling panel and the disturbance of the effect of radiant cooling depending on the location.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of a radiation cooling device according to the present invention.

[Explanation of symbols]

 1 Refrigerant Pump 2 Four-way Valve 3 Radiant Cooling Heat Exchanger 4 Ceiling Panel 5 Check Valve 6 Cooling Heat Exchanger 7 Cold Storage Tank 8 Refrigerant-to-Refrigerant Heat Exchanger 9 Refrigerator 10 Cooling Circuit 11 Open / Close Valve 12 Temperature Sensor 13 Control vessel

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Yoshida 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A refrigerating cycle comprising a refrigerant-refrigerant heat exchanger including a refrigerant pump, a four-way valve, a heat exchanger for radiant cooling, a heat exchanger for cold storage, and a refrigerator as a main component, and the four-way valve. One flow passage and the discharge side of the refrigerant pump are connected, another flow passage and the suction side of the refrigerant pump are connected via a refrigerant-refrigerant heat exchanger, and one of the remaining two flow passages and the heat for radiant cooling are connected. The inlet of the exchanger is connected, the other is connected to the inlet of the heat exchanger for cold storage, and the discharge side of the refrigerant pump and the heat exchanger for radiant cooling or the heat exchanger for cold storage are switched and connected. At the same time, the suction side of the refrigerant pump and the heat exchanger for cold storage or the exchanger for radiant cooling, via the refrigerant-refrigerant heat exchanger, while configuring a four-way valve circuit to be switched, The outlet of the radiant cooling heat exchanger is passed through a check valve. And the outlet of the heat exchanger for cold storage, and further connected the outlet of the heat exchanger for cold storage to the pipe between the four-way valve and the refrigerant-refrigerant heat exchanger via an on-off valve, Radiant cooling system. 2. A temperature sensor for detecting the temperature of a regenerator that exchanges heat with the heat exchanger for cold storage is provided, and when the temperature sensor is above a certain temperature, the refrigerator is operated to operate the refrigerant-refrigerant heat exchanger. The radiant cooling device according to claim 1, which is cooled. 3. The radiation according to claim 1, wherein the pipe between the four-way valve and the inlet of the heat exchanger for radiant cooling and the outlet pipe of the check valve are indirectly heat-exchangeable. Air conditioner. 4. The radiant cooling apparatus according to claim 1, wherein the refrigerant flowing in the refrigeration cycle is a non-azeotropic mixed refrigerant in which two or more kinds of refrigerants are mixed.