KR20060041532A - Passive cooling ground heat system - Google Patents

Abstract

The present invention, by using a phase change material (PCM) in the storage tank, can be used for energy saving, peak control and emergency in the case of a freezer failure, heat exchanger using an outdoor pipe (HDPE pipe) into the ground The present invention relates to a natural air-conditioning geothermal system that eliminates noise, noise, and environmental problems. More specifically, it is possible to prevent the occurrence of damage to electronic equipment by maintaining a constant temperature / humidity environment in a communication room or a base station under predetermined conditions. A natural air conditioning geothermal system.

The present invention includes an indoor unit having an indoor heat exchanger, an indoor fan, and an indoor unit pump, which is arranged indoors such as a communication room; A compressor for compressing the refrigerant; An outdoor heat exchanger; An outdoor fan for radiating heat generated by the outdoor heat exchanger; An outdoor unit pump disposed on a pipe connecting the indoor heat exchanger and the outdoor heat exchanger; A PCM tank accommodated by a predetermined amount of phase change material (PCM); The heat exchanger plate heat exchanger (PLATE HEAT EXCHANGER) of the compressor on the basis of temperature conditions and control setting conditions such as room temperature, outdoor air temperature and natural air conditioning set temperature for a predetermined indoor set temperature where the indoor unit is disposed; An indoor unit pump, the outdoor unit pump, the indoor unit fan, characterized in that it comprises a control unit for controlling the operation (ON / OFF) of the outdoor unit fan.

Description

 Passive Cooling Ground Heat System

1A and 1B are front and side views of an indoor unit for implementing a natural air conditioning geothermal system according to the present invention, respectively;

Figures 2a to 2c are each an introduction of the configuration other than the indoor unit for implementing the natural air conditioning geothermal system according to the present invention,

3 is a circuit block diagram of a natural air conditioning geothermal system according to the present invention controlled through FIGS. 1A, 1B and 2A, 2B, 2C;

4 is a flowchart of FIG. 1;

5 is another configuration of the natural air conditioning geothermal system according to the present invention,

* Explanation of symbols for the main parts of the drawings

10: indoor unit 13: indoor unit pump

15: indoor heat exchanger 18: indoor fan

31 compressor 33: outdoor unit pump

35: outdoor fan 37: PCM tank

The present invention relates to a natural air-conditioning geothermal system, and more particularly, a phase change material capable of preventing the occurrence of burnout of electronic equipment by maintaining a constant temperature / humidity environment in a communication room or a base station under predetermined conditions ( The present invention relates to a natural air conditioning geothermal system using PCM.

In particular, the present invention reduces the peak at the peak time of high power consumption in the summer, the heat exchanger using geothermal heat, energy saving to eliminate the noise and failure, environmental aspects of the tank and outdoor unit using PCM for emergency use in case of damage and breakdown of the freezer Focus on.

For example, electronic equipment used in communication rooms or base stations damages the components that make up electronic equipment due to the heat generated by itself, and sometimes damage to these components can cause fatal damage to electronic equipment. Thus, a communication room or a base station is provided with an air conditioner called an air conditioner and a constant temperature and humidity chamber to cool high heat generated from electronic equipment.

However, the general air conditioner is a cold air by forming a refrigeration cycle that circulates the refrigerant (R22, R134a) to a compressor, a condenser, an indoor heat exchanger, in fact, the operating cost is excessively disadvantageous. In addition, the system may become unstable due to unstable temperature / humidity management, as well as excessive consumption of energy and factors that hinder efficiency by reducing the working environment and surrounding environment due to the refrigerant circulating process and noise from the fan of the outdoor unit. It works in a way.

Accordingly, the present applicant generates a cold air to cool the high heat generated from the electronic equipment to maintain a constant temperature / humidity environment in the communication room or the base station to a predetermined condition, but the operating cost and noise compared to the conventional air conditioning equipment It has come to propose a natural air conditioning geothermal system using a phase change material (PCM) to reduce this dramatically.

An object of the present invention is to provide a natural air-conditioning geothermal system using a phase change material (PCM) to prevent the occurrence of burnout of electronic equipment by maintaining a constant temperature / humidity environment in a communication room, a computer room, or a base station. To provide.

The object is an indoor unit having an indoor heat exchanger, an indoor fan, and an indoor air pump and disposed in a room such as a communication room; A compressor for compressing the refrigerant; An outdoor heat exchanger; An outdoor fan for radiating heat generated by the outdoor heat exchanger; An outdoor unit pump disposed on a pipe connecting the indoor heat exchanger and the outdoor heat exchanger; A tank accommodating a predetermined volume of phase change material (PCM); The compressor, a plate heat exchanger (PLATE HEAT EXCHANGER), the indoor unit pump based on the temperature and type setting conditions such as the room temperature, the outside air temperature and the natural air conditioning setting temperature for the predetermined indoor set temperature in which the indoor unit is disposed, the indoor unit pump It is achieved by a natural air conditioning geothermal system, including a control unit for controlling the on / off operation of the outdoor unit pump, the indoor unit fan, the outdoor unit fan.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1A and 1B are respectively a front view and a side view of an indoor unit for implementing a natural air conditioning geothermal system according to the present invention, and FIGS. 2A to 2C are introductions of components other than the indoor unit for implementing a natural air conditioning geothermal system according to the present invention, respectively. FIG. 3 is a circuit block diagram of a natural air conditioning system according to the present invention controlled through FIGS. 1A, 1B and 2A, 2B, 2C, FIG. 4 is a flowchart of FIG. 1, and FIG. 5 is in accordance with the present invention. Another schematic diagram for a natural HVAC system.

1A, 1B, and 5, the indoor unit 10 is installed in a room such as a communication room or a base station to maintain a constant temperature and humidity of electronic equipment in a room. The indoor unit 10 refers to FIG. 3, but mainly refers to FIG. 1, and includes a base 11 and an indoor unit casing 12 standing upright on an upper portion of the base 11.

An indoor unit pump 13 is provided at the bottom of the indoor unit casing 12 adjacent to the base 11. In the upper region of the indoor unit pump 13, an indoor heat exchanger 15 is installed at an angle to increase the contact area with air. The indoor heat exchanger (15) is composed of linear coils (15a, D.X COIL) through which gas flows and cold water coils (15b, COOLING WATER COIL) through which water flows. In front of the indoor heat exchanger (15), a filter (16) is provided for primarily filtering the air flowing into the indoor air casing (12).

The indoor fan 18 is located above the indoor heat exchanger 15. The indoor fan 18 floats the air heat-exchanged in the indoor heat exchanger 15 upward and blows air into the room such as a communication room or a base station through the louver 19 formed at the front thereof. The indoor fan 18 is equipped with a fan motor (not shown) for operating the indoor fan 18.

A plurality of devices to be described later, including the fan motor is controlled by the control unit 21 formed on the front of the indoor unit casing (12). That is, by operating the selection buttons (not shown) formed in the control unit 21 is operated through the control means of the control box 22 mounted inside the indoor unit casing (12).

Of course, in addition to this, there are various pipes for interconnecting with the components in the outdoor unit 30 below, and reference numerals and descriptions thereof will be omitted and will be described with reference to the drawings.

Looking at the remaining components other than the various components in the indoor unit 10 described above are as follows. These components may be separately configured as the machine room 30 or may be integrally configured in the indoor unit 10.

If it is configured as the machine room 30 can follow the configuration of Figures 2a to 2c. As shown in FIG. 2A to FIG. 2C, the compressor 31 has a configuration in which a refrigerant is compressed, a dry coil 32, an outdoor unit pump 33, a condenser 34, and an outdoor unit fan 35. . Reference numeral 38 is a dryer, and 39a and 39b are expansion valves, respectively.

These may be selectively arranged in the piping in which gas and water circulate, in addition to the plate heat exchanger 36 and the PCM tank 37. Of course, the PCM tank 37 may also be disposed outside or provided in the indoor unit 10 regardless of the configuration of FIGS. 2A to 2C.

For reference, the plate heat exchanger 36 provided in the machine room 30 and interacting with the compressor 31 may be, for example, an absorption type to maximize efficiency during heat exchange. That is, it cycles as follows to show individual operations and effects.

1, when the external temperature is higher than the set value (Example 28), the load is kept constant while the energy saving is insufficient when the cold water coil 15b, the PCM tank 37, and the pumps 13, 33 are used. 15a, D, X COIL) and the compressor 31, the condenser 34, the outdoor unit pump 33, the dry coil (32).

2, when the external temperature is lower than the set value (for example, 18 to 28 degrees), the cold water coil 15b, the indoor unit pump 13, the PCM tank 37, the plate heat exchanger 36, the compressor 31, The condenser 34, outdoor unit pump 33, and cold water coil 15b operate.

3, when the external temperature is significantly lower than the set value (for example, 18 degrees or less), the cold water coil 15b, the outdoor unit pump 33, the dry coil 32 is operated.

4, if the underground heat exchanger is applied, no outdoor unit (dry coil, fan) is required, and the branch pipe 40 of FIG. 5 is used.

For reference, the plate heat exchanger 36 is for transferring heat from one fluid (or gas) to another without physical contact. In other words, the fluids do not mix with each other but only transfer heat. It is used to indirectly heat or cool a fluid and not to heat or cool the heat exchanger itself.

Therefore, it is effective that the plate heat exchanger 36 is large in size, and the cost of the heat exchanger may be large in proportion to the size. It is important to carry out large capacity heat exchange at low cost. So-called Shell & Tube type has relatively little heat exchange compared to its size. Therefore, in the present invention, by using the plate heat exchanger 36 for heat exchange to reduce the temperature in the PCM tank 37, the condensing efficiency is maximized.

As in the embodiment of FIG. 5, a separate branch pipe 40 may be connected to the machine room 30. That is, when the compressor 34 operates, a predetermined heat is generated in the compressor 34. The heat is circulated through the branch pipe 40 to the underground to exchange heat exchange to an underground temperature having approximately 10 to 20 degrees. do.

As described above, the branch pipe 40 discharges heat generated during condensation into the ground instead of the cooling tower (normal outdoor heat exchanger) while water or antifreeze circulates in the circuit through a closed geothermal heat exchange pipe (PE) embedded in the ground. The temperature of 15 to 20 degrees is used throughout the year, and during the summer cooling, the branch pipe 40 may be used instead of the cooling tower (37 degrees) for high temperature heat generated during condensation. If the same as Figure 5, the outdoor fan 35 or the like is not necessary.

In the PCM tank 37, a certain capacity of the phase change material (PCM) is accommodated to store the refrigerant in the tank by the plate heat exchanger at low temperature and auxiliary.

For reference, PCM is an abbreviation of "Phase Change Material" in English, and it absorbs latent heat while phase shifting from solid to liquid at a constant temperature below or phase change from liquid to solid. . This phase change material (PCM) has a very high characteristic compared to other materials in the phase to heat of solid-to-liquid phase at the temperature of use, it is possible to minimize the capacity of the heat storage tank, compared to the package air conditioner for cooling It can reduce power costs by about 50%.

In addition, since it does not use low temperature solution (Brine) as a phase change material (PCM), it is environmentally friendly material and can be widely used in the surrounding area, so it has no objection and has economic advantages. However, if the temperature to be used is less than or equal to 0 ° C or higher, regardless of heat accumulated, a phase change material (PCM) having a suitable phase change temperature is required, and the physical and chemical properties of the phase change material (PCM) used are The design of the system should take into account the characteristics.

Next, the operation of the natural air conditioning geothermal system having such a configuration will be described with reference to FIGS. 3 and 4.

In the structure of the circuit, as shown in <NOTE> at the bottom, a two-line part is a water pipe through which water moves, and a three-line part with a dotted line inside is a refrigerant pipe through which gas moves. The configuration of the circuit is to follow the direction of the arrow provided in each pipe, including a two-line water pipe and a three-line refrigerant pipe, so a separate description is omitted. And each location temperature can be detected by the sensors (sensor-1, 2, 3) shown in Figure 3, respectively, the sensors (sensor-1, 2, 3), respectively, the outside air temperature, The indoor temperature and the temperature in the PCM tank 37 are detected and transmitted to the controller.

First, power is applied to turn on the display window of the control unit 20, and at the same time, various selection buttons (operation S / W) are selected so that the lamp is turned on and the indoor unit fan 18 is turned on. In this state, when the indoor temperature is higher than the predetermined indoor set temperature, the entire operation of the system is turned off. Of course, such a temperature condition should be equipped with a sensor for detecting the temperature of the room, which will be omitted.

When the indoor temperature is higher than the indoor set temperature, when the predetermined natural air conditioning set temperature (for example, 28 degrees) is lower than the outside air temperature, the natural air conditioning operation mode is entered. In the natural air conditioning operation mode, the compressor 31 is turned off by the control unit, the indoor unit pump 13, the outdoor unit pump 33 and the indoor unit fan 18 are on, and the outdoor unit fan 35 is off. OFF). In this natural air conditioning mode, the sole valves 1 and 4 shown in the drawing are turned on and 2, 3, 5 and 6 are turned off.

Then, if the room temperature is higher than the indoor set temperature and the natural air conditioning set temperature is lower than the outside air temperature, the controller proceeds to a predetermined peak operating mode. Peak refers to the peak time with the highest power usage during the day.

In the peak operation mode, when the indoor temperature is lower than the indoor setting temperature, the controller executes the normal operation mode, the cold storage operation mode, and the anti-cooling operation mode based on a predetermined time setting condition.

That is, when the controller enters the normal operation mode (for example, 08:00 to 10:00, 12:00 to 14:00, and 17:00 to 22:00 time band), the compressor 31 is turned on ( ON), indoor unit pump 13 and outdoor unit pump 33 are OFF, and indoor unit fan 18 and outdoor unit fan 35 are ON. At this time, the sole valve 6 is ON and 1,2,3,4,5 are OFF.

When the predetermined time setting condition reaches, for example, the time zone of 22:00 to 08:00, the controller enters the cold storage operation mode. In the cold storage operation mode, the compressor 31 is ON, the indoor unit pump 13 and the outdoor unit pump 33 are ON, the indoor unit fan 18 is OFF, and the outdoor unit fan 35 is controlled by the control unit. Is ON. At this time, the sole valves 2, 3, 5 shown in the drawing are ON and 1, 4, 6 are OFF.

When the predetermined time setting condition reaches, for example, the time zones of 10:00 to 12:00 and 14:00 to 17:00, the controller enters the anti-cooling operation mode. In the cold-cooling operation mode, the compressor 31 is turned off by the control unit, the indoor unit pump 13 is on, the outdoor unit pump 33 is off, the indoor unit fan 18 is on, The outdoor fan fan 35 is turned off. At this time, the sole valves 1 and 4 shown in the drawing are turned on and 2, 3, 5, and 6 are turned off.

On the other hand, while the system proceeds to the peak operation mode by the controller, the room temperature is higher than the room setting temperature, and the temperature of the PCM tank 37 is higher than the predetermined tank setting temperature (for example, 10 degrees). If it is low, the cooling operation mode is continued. In this case, too, the PCM tank 37 should be provided with a temperature sensor for measuring the temperature of the PCM tank 37 and transmits it to the controller.

If the temperature of the PCM tank 37 is higher than the predetermined tank setting temperature during the process of the system in the peak operation mode by the controller, the compressor 31, the indoor unit pump 13, The outdoor unit pump 33, the indoor unit fan 18, and the outdoor unit fan 35 are all ON. At this time, the sole valves 2, 3, 5, 6 shown in the drawings are ON and 1, 4 are OFF.

The natural air conditioning geothermal system, by using the heat of nature to maintain a constant temperature, there is an advantage that the user's benefit is increased as well as environmentally friendly because excessive power is not consumed.

Therefore, it is not only applicable to communication rooms, computer rooms, communication enclosures, base stations, etc., which require cooling 24 hours a year, but also can be sufficiently used in large factories with excessive cooling and heating. In addition, this natural air conditioning geothermal system is excellent in clean environment problems, dust problems, noise problems, cooling shutdown due to power failure or failure.

In fact, as a result of experimenting this natural air conditioning geothermal system, the power saving efficiency is more than 60% compared to the forced air conditioner called conventional air conditioner. In addition, the service life is long, there is no noise, and the failure rate is reduced.

In particular, even if a power outage or emergency occurs, because there is time to spare for at least several hours, there is an advantage in maintaining the cooling state, it is harmless to the expensive equipment or equipment around. In addition, the system utilizes natural phenomena such as geothermal heat and natural convection of air to the maximum, and is therefore harmless to the human body, thereby providing an additional effect of improving working conditions.

Although the present invention has been described in detail with reference to the drawings, the present invention is not limited thereto.

 As described above, according to the natural air conditioning geothermal system using a phase change material (PCM) according to the present invention, since the excessive power is not consumed, the user's benefit is increased as well as the environment-friendly effect. Therefore, it is not only applicable to communication rooms, computer rooms, communication enclosures, base stations, etc., which require 24 hours of cooling, but also can be used in large factories with excessive heating and cooling.

In addition, the natural air conditioning geothermal system using a phase change material (PCM) according to the present invention has an excellent effect on the cooling environment problem, dust problem, noise problem, cooling interruption problem due to power failure or failure.

Claims (11)

An indoor unit having an indoor heat exchanger, an indoor fan, and an indoor unit pump and arranged in an interior of a communication room; A compressor for compressing the refrigerant; An outdoor heat exchanger; An outdoor fan for radiating heat generated by the outdoor heat exchanger; An outdoor unit pump disposed on a pipe connecting the indoor heat exchanger and the outdoor heat exchanger; A PCM tank accommodated by a predetermined amount of phase change material (PCM); The compressor, the indoor unit pump, the outdoor unit pump, the indoor unit fan, and the outdoor unit based on temperature and type setting conditions such as an indoor temperature, an outdoor temperature, and a natural air conditioning set temperature for a predetermined indoor set temperature where the indoor unit is arranged. A natural air conditioning geothermal system comprising a control unit for controlling the ON / OFF operation of the fan. The method of claim 1, The control unit, the natural air conditioning geothermal system, characterized in that when the indoor temperature is higher than the indoor set temperature, (OFF) the overall operation of the system (OFF). The method of claim 2, The controller may enter a natural air conditioning operation mode when the indoor temperature is higher than the indoor set temperature, and when the natural air conditioning set temperature is lower than the outside air temperature; The compressor is OFF (OFF), the indoor unit pump, the outdoor unit pump and the indoor unit fan (ON), characterized in that the outdoor air fan is turned off (OFF), natural air conditioning geothermal system. The method of claim 2, And the controller is configured to proceed to a peak operation mode when the indoor temperature is higher than the indoor set temperature and the natural air conditioner set temperature is lower than the outside air temperature. The method of claim 4, wherein The controller may be configured to execute a normal operation mode, a cold storage operation mode, and an anti-cooling operation mode based on the time setting condition when the indoor temperature is lower than the indoor setting temperature in the peak driving mode. Natural Air Conditioning Geothermal System. The method of claim 5, In the normal operation mode, the compressor is ON, the indoor unit pump and the outdoor unit pump are OFF, and the indoor fan and the outdoor unit fan are ON by the control unit. Geothermal system. The method of claim 5, The compressor is ON, the indoor unit pump and the outdoor unit pump are ON, the indoor unit fan is OFF, and the outdoor unit fan is ON by the control unit in the cold storage operation mode. Natural air conditioning geothermal system. The method of claim 5, The compressor is turned OFF, the indoor unit pump is ON, the outdoor unit pump is OFF, the indoor unit fan is ON, and the outdoor unit fan is OFF by the control unit. OFF), natural air conditioning geothermal system. The method of claim 5, The control unit, when the room temperature is higher than the room set temperature and the PCM tank temperature is lower than a predetermined tank set temperature in the peak (PEAK) operation mode, and executes the anti-cooling operation mode, When the temperature of the PCM tank is higher than a predetermined tank set temperature, the compressor, the indoor unit pump and the outdoor unit pump, the indoor fan and the outdoor fan are all turned ON by the control unit. Geothermal system. The method of claim 1, And the outdoor heat exchanger is a plate heat exchanger. The method of claim 1, When the outdoor fan is not provided, heat generated during operation of the compressor is radiated by a predetermined branch pipe buried underground, natural air conditioning geothermal system.

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