KR101519714B1 - Conditioning system for optimum mixing ratio of supply air using heat sink and control method of the same - Google Patents

Abstract

The present invention provides an air conditioning system and a control method thereof for determining optimum mixing ratio of supply air using a heat sink for reducing energy consumption and preventing contamination in a duct.
An air conditioning system for determining optimal mixing ratio of supply air utilizing a heat sink according to a preferred embodiment of the present invention includes a heat sink for absorbing heat from the outside air OA to generate pre-cooling / pre-heating air PA; A mixing chamber for mixing the outside air (OA) and the precooled / preheated air (PA); An air conditioner connected to the mixing chamber outlet side and containing an air filter, an air cooler, an air heater, a humidifier, a blower or the like in a casing to purify air mixed in the mixing chamber to supply air to the room; A pre-cooling / preheating air damper connected between the heat sink and the mixing chamber to control an introduction amount of the pre-cooling / pre-heating air; An outside air damper connected between the outside air OA and the mixing chamber to control the outside air introduction amount; A ventilation damper connected between the room and the mixing chamber to control the amount of ventilation introduced; A pre-cooling / preheating air sensor, an outside air sensor, and a ventilation sensor provided at the entrance sides of the pre-cooling / preheating air damper, the outside air damper, and the ventilation damper; And a control unit connected to the pre-cooling / pre-heating air sensor, the outside air sensor, and the ventilation sensor to control the amount of opening of each of the pre-cooling / preheating air damper, the outside air damper and the ventilation damper.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system for determining optimum mixing ratio of a supply air using a heat sink and a control method thereof,

The present invention relates to an air conditioning system and a control method thereof, and more particularly, to an air conditioning system and a control method thereof for determining optimum mixing ratio of supply air using a heat sink for reducing consumption energy and preventing various kinds of contamination in a duct .

Recently, introduction of a preheating / preheating system using geothermal heat, excellent heat, seawater heat, etc. is under consideration to reduce energy consumption of buildings. This system has the effect of reducing the amount of energy consumed in the air conditioner in terms of energy. However, there is a possibility of problems in terms of maintenance. If the maintenance of the precooling and preheating ducts is difficult, it is considered that the quality of the air flowing through the ducts such as fungal growth, foreign matter generation, Because it has the potential to become. Therefore, the air introduced through such a system must take into account not only the thermal state but also the air quality.

Korean Patent Laid-Open No. 10-2008-0014871 discloses a first humidity control device for humidifying air by supplying humidification air to an indoor perimeter zone, an indoor zone for indoor humidity, And a second humidifier for humidifying the humid air by supplying humidification air to the first humidifier, wherein the first humidifier includes: input means for inputting the indoor condensation occurrence information; And an interlocking control means for causing the second humidity controller (20) to continue the humidification operation by performing a dew condensation operation for removing the condensation by lowering the relative humidity of the supplied air to the first humidity controller The system is known. Therefore, when condensation occurs, the first humidity controller can perform the condensate removing operation, so that unnecessary operation can be suppressed and energy saving can be achieved.

However, the above background art does not use geothermal heat, excellent heat, seawater heat, and the like, and thus has a limitation on the reduction of energy consumption.

Korean Patent Laid-Open Publication No. 10-2012-0135771 Korean Unexamined Patent Publication No. 1990-0016700

It is an object of the present invention to provide an air conditioning system and a control method thereof for determining optimal mixing ratio of supply air using a heat sink for reducing energy consumption and preventing contamination in a duct.

An air conditioning system for determining optimal mixing ratio of supply air utilizing a heat sink according to a preferred embodiment of the present invention,

A heat sink for absorbing heat from the outside air (OA) to generate pre-cooling / preheating air (PA);

A mixing chamber for mixing the outside air (OA) and the precooled / preheated air (PA);

An air conditioner connected to the mixing chamber outlet side and containing an air filter, an air cooler, an air heater, a humidifier, a blower or the like in a casing to purify air mixed in the mixing chamber to supply air to the room;

A pre-cooling / preheating air damper connected between the heat sink and the mixing chamber to control an introduction amount of the pre-cooling / pre-heating air;

An outside air damper connected between the outside air OA and the mixing chamber to control the outside air introduction amount;

A ventilation damper connected between the room and the mixing chamber to control the amount of ventilation introduced;

A pre-cooling / preheating air sensor, an outside air sensor, and a ventilation sensor provided at the entrance sides of the pre-cooling / preheating air damper, the outside air damper, and the ventilation damper;

And a control unit connected to the pre-cooling / pre-heating air sensor, the outside air sensor, and the ventilation sensor to control the amount of opening of each of the pre-cooling / preheating air damper, the outside air damper and the ventilation damper.

Further, a method of controlling an air conditioning system for determining an optimal mixing ratio of supply air using a heat sink according to a preferred embodiment of the present invention,

Setting an air supply air volume, an air supply temperature, and an air supply air quality (IRQ) of the air conditioner;

(OA), the precooled / preheated air (PA) generated in the heat sink, and the ventilation (RA) entering the mixing chamber from the room select the one having the closest temperature to the air supply (SA) Thereby maximizing the amount of introduction into the mixing chamber;

Calculating a minimum air flow condition that can be introduced by measuring the thermal condition of the outside air (OA), the precooled / preheated air (PA) and the ventilation (RA) and the air quality (IAQ);

When the air supply air quality of the introduction air deteriorates, the pre-cooling / preheating air damper, the outside air damper, and the ventilation damper are used to shut off the inflow of air at the corresponding inlet and generate a signal of the deteriorated state to the manager.

Further, in the cooling mode of the air conditioner,

(SA), ventilation (RA), and outside air (OA), so that the air supply condition is lower than the enthalpy value of the room air (IA) With a maximum mixing ratio;

Limiting the mixing ratio of the ventilation (RA) appropriately in consideration of indoor air quality;

When the ventilation (RA) reaches the nearest condition of cooling, fixing the maximum introduction amount and maximizing the order introduction amount;

And generating an error signal when the precooled / preheated air PA has an enthalpy too low than the supply air SA.

Further, in the heating mode of the air conditioner,

Introducing a temperature state having a higher enthalpy than the supply air (SA) so that the supply condition (SA) is higher than the enthalpy value of the room (IA) (or the ventilation (RA)) at a maximum mixing ratio;

Limiting the mixing ratio of the ventilation (RA) appropriately in consideration of indoor air quality;

Fixing the maximum introduction amount when the ventilation (RA) reaches the nearest condition of heating, and maximizing the order introduction amount;

And generating an error signal when the precooled / preheated air PA has an enthalpy higher than the enthalpy of the supply side SA.

In addition, when the air quality control range of the indoor is preferentially determined and the indoor air quality is excluded to the minimum value of the control range, it is possible to increase the ratio of ventilation (RA) / precooled / preheated air (PA) (PA) / ambient air (OA) ratio and minimizes the ventilation (RA) ratio when the air-fuel ratio reaches the reference value.

According to the air conditioning system and the control method thereof for determining the optimal mixing ratio of the supply air utilizing the heat sink of the present invention, the air supply amount and the state of the air supply are sequentially determined by the sequential logic in the cooling / And it is possible to control the amount of energy consumed in the air conditioning system by minimizing the amount of energy consumed in the air conditioning system. In addition, the possibility of deterioration of the air quality is reduced, the maintenance of the pipeline is easy, and the occurrence of mold and foreign matter contamination can be eliminated.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
1 is a configuration diagram of an air conditioning system according to the present invention;
2 is a conceptual diagram illustrating the control of the air conditioning system according to the present invention.
3 is a graph illustrating four control modes when the air conditioner is in a one-stage control of the air conditioning system according to the present invention.
4 is a graph illustrating four control modes in the case of a heating condition in the one-stage control of the air conditioning system according to the present invention.
FIG. 5 is a graph showing air volume and mixing ratio according to indoor air quality. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

The air conditioning system according to the present invention is provided with a heat sink 12 for absorbing heat from the outside air OA to generate pre-cooling / pre-heating air PA as shown in FIG. The heat sink 12 refers to any means of absorbing heat from heat (eg, underground concrete tunnels), geothermal, stormwater, seawater heat, and so forth.

A mixing chamber 14 for mixing the outside air OA and the precooled / preheated air PA is provided. The mixing chamber 14 has three inlet ports and one outlet port into which the outside air OA, the pre-cooling / preheating air PA, and the ventilation air RA are respectively introduced.

An air conditioner (16) is connected to the outlet side of the mixing chamber (14). The air conditioner 16 accommodates devices such as an air filter, an air cooler, an air heater, a humidifier, and a blower into the casing to purify the mixed air in the mixing chamber 14 to supply the air supply (SA)

Damping means for controlling the introduction amount is provided at the inlet side of the mixing chamber 14 into which the outside air OA, the pre-cooling / preheating air PA and the ventilation RA are respectively introduced.

That is, a pre-cooling / preheating air damper 13 is provided between the heat sink 12 and the mixing chamber 14 for controlling the introduction amount of the pre-cooling / pre-heating air PA and the outside air OA and the mixing chamber 14, A ventilation damper 19 for controlling the amount of ventilation introduced between the room 18 and the mixing chamber 14 is provided. The dampers are connected to an actuator and an actuator to constitute an opening / closing control plate for controlling opening amount.

A pre-cooling / preheating air sensor S1, an outside air sensor S2, a ventilation sensor (not shown) for measuring the temperature of the corresponding air flow rate are provided on the inlet sides of the pre-cooling / preheating air damper 13, the outside air damper 15 and the ventilation damper 19 S3 are installed.

The control unit 20 is electrically connected to the pre-cooling / preheating air sensor S1, the outside air sensor S2 and the ventilation sensor S3. The control unit 20 controls the amount of opening of each of the pre-cooling / preheating air damper 13, the outside air damper 15 and the ventilation damper 19 by a control program (algorithm).

2 shows a control conceptual diagram of an air conditioning system according to the present invention. As shown in Fig. 2, the setting unit 10 sets the conditions of air volume, air supply temperature, and supply air quality (IAQ). An algorithm 1 for determining mixing ratios introduced by the sequential logic of the condition values set in the setting unit 10 and an algorithm 2 for determining an optimum mixing ratio in real time in consideration of the air quality and thermal conditions And performs optimized control. At this time, the sensing unit 5 detects the temperature, the humidity, and the IAQ state to send to the controller 20, and the controller 20 controls the precooling / The opening ratio of the preheating air damper 13, the outside air damper 15, and the ventilation damper 19 is controlled.

A control method using the air conditioning system configured as above will be described.

First, the present invention consists of a first stage in which the supply air volume and the state of the air supply are controlled by sequential logic in a predetermined condition, and a two-stage control in which the air supply amount and the state of the air supply are optimized in real time.

In order to simplify the operation of the building, the 1-stage control is operated by fixing the air supply direction and the supply air condition, and using the enthalpy (heat energy) of the outside air (OA), precooled / preheated air (PA) Lt; / RTI >

In this case, there are a total of 8 modes with four cooling modes and four heating modes.

The two-stage control automatically detects the optimum air volume and optimum air condition of the supply air (SA) by detecting the conditions of the indoor / outdoor air (OA), precooled / preheated air (PA) The algorithm 2 is executed.

This will be explained in more detail.

First, the supply air volume, the supply air temperature, and the supply air quality IAQ of the air conditioner 16 are set in the setting unit 10.

Next, the fresh air (OA), the precooled / preheated air PA generated in the heat sink 12, the air flow rate supplied to the room 18 in the ventilation RA flowing into the mixing chamber 14 from the inside 18 (SA) temperature of the mixing chamber 14 is selected to maximize the amount of introduction into the mixing chamber 14.

Next, the minimum air volume conditions that can be introduced are calculated by measuring the thermal conditions (temperature, humidity) and air supply air quality (IAQ) of the outside air (OA), precooled / preheated air (PA) and ventilation (RA).

Next, when the air supply air quality of the introduction air deteriorates, the pre-cooling / preheating air damper 13, the outside air damper 15, and the ventilation damper 19 are used to block the inflow of air at the corresponding inlet portion, .

3, when the air conditioner 16 is in the cooling mode, a temperature condition close to the supply air (SA) such that the supply air (SA) condition is lower than the enthalpy (heat energy) (RA), and the outside air (OA) among the supply air (SA), the ventilation (RA) and the outside air (OA). At this time, one of the cooling modes 1, 2, 3, and 4 is selected and operated according to the temperature condition of the pre-cooling / preheating air PA as shown in FIG.

At this time, the mixing ratio of the ventilation (RA) can be appropriately limited in consideration of indoor air quality. This can be determined by measuring the air quality of the outside air (OA), the precooled / preheated air (PA), and the ventilation (RA) and comparing the combined values with the supply condition (SA).

Then, when the ventilation (RA) reaches the nearest condition of cooling, the maximum introduction amount is fixed, and the order introduction amount is maximized.

At this time, if the precooled / preheated air PA has an enthalpy too low than the supply air SA, an error signal is generated.

On the other hand, at the time of heating the air conditioner 16, the temperature condition having a higher enthalpy than the supply air (SA) is preferentially given so that the supply condition (SA) is higher than the enthalpy value of the room IA Lt; / RTI > That is, as shown in FIG. 4, any one of the heating modes 5, 6, 7, and 8 is selected and operated. At this time, the mixing ratio of the ventilation (RA) is adequately limited in consideration of the indoor air quality. Further, when the ventilation (RA) reaches the nearest heating condition, the maximum introduction amount is fixed and the introduction amount of the subordinate order is maximized. An error signal is generated when the precooled / preheated air PA has an enthalpy too high than the supply air SA.

When the control of the first stage is performed according to the cooling and heating modes, the control of the second stage is performed in real time as shown in the graph of FIG.

That is, if the air quality control range of the indoor air is preferentially determined and the indoor air quality is eradicated to the minimum value of the control range, the proportion of the ventilation (RA) / precooled / preheated air (PA) (PA) / outside air (OA) ratio and minimizes the ventilation (RA) ratio when the indoor air quality reaches the reference value .

As described above, according to the present invention, the mixing ratio is determined by maximizing the temperature of the supply and supply most similar to the temperature of the supply and supply according to the cooling and heating mode in one step, and the energy consumption and the indoor air quality are considered in two stages, By operating the system, energy consumption can be reduced, various types of pipelines can be removed, and pollution can be prevented.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

12: Heatsink
13: Preheating / heat air damper
14: Mixing chamber
15: outside damper
16: Air conditioner
19: Ventilation damper
20:

Claims (5)

A heat sink 12 for absorbing heat from the outside air OA to generate pre-cooling / preheating air PA;
A mixing chamber (14) for mixing the outside air (OA) and the precooled / preheated air (PA);
An apparatus such as an air filter, an air cooler, an air heater, a humidifier, a blower and the like is housed in the casing to clean the mixed air in the mixing chamber 14 to the room 18 An air conditioner (16) for supplying air supply (SA);
A pre-cooling / preheating air damper (13) connected between the heat sink (12) and the mixing chamber (14) to control the amount of precooling / preheating air (PA) introduced;
An outside air damper 15 connected between the outside air OA and the mixing chamber 14 to control the outside air introduction amount;
A ventilation damper (19) connected between the room (18) and the mixing chamber (14) to control the amount of ventilation introduced;
A pre-cooling / preheating air sensor S1, an outside air sensor S2 and a ventilation sensor S3 provided on the inlet sides of the pre-cooling / preheating air damper 13, the outside air damper 15 and the ventilation damper 19;
The opening amounts of the pre-cooling / preheating air damper 13, the outside air damper 15 and the ventilation damper 19 are connected to the pre-cooling / pre-heating air sensor S1, the outside air sensor S2 and the ventilation sensor S3, And a control unit (20) for controlling the supply of air to the heater. Setting the supply air volume, the supply air temperature, and the supply air quality (IRQ) of the air conditioner (16);
(OA), pre-cooling / preheating air (PA) generated in the heat sink (12), air supply amount of air supplied to the room (18) of the ventilation (RA) flowing into the mixing chamber (14) (SA) temperature to maximize the amount of introduction into the mixing chamber 14;
Calculating a minimum air volume condition which can be introduced by measuring the thermal condition (temperature, humidity) and the air quality (IAQ) of the outside air OA, the precooled / preheated air PA and the ventilation RA;
When the air supply air quality of the introduction air deteriorates, the pre-cooling / preheating air damper 13, the outside air damper 15, and the ventilation damper 19 are used to block the inflow of air at the corresponding inlet and generate a signal of the deteriorated state to the manager And determining the optimal mixing ratio of the supply air using the heat sink. 3. The method of claim 2,
In the cooling mode of the air conditioner (16)
The mixing ratio of the air in the temperature state close to the air supply (SA) is maximized so that the air supply (SA) condition is lower than the enthalpy value of the indoor air (IA) ) And the outside air (OA) at a maximum mixing ratio;
Limiting the mixing ratio of the ventilation (RA) appropriately in consideration of indoor air quality;
When the ventilation (RA) reaches the nearest condition of cooling, fixing the maximum introduction amount and maximizing the order introduction amount;
And generating an error signal when the precooled / preheated air (PA) has an enthalpy too low than the supply air (SA). Control method. 3. The method of claim 2,
In the heating mode of the air conditioner (16)
Introducing a temperature state having a higher enthalpy than the supply air (SA) so that the supply condition (SA) is higher than the enthalpy value of the room (IA) (or the ventilation (RA)) at a maximum mixing ratio;
Limiting the mixing ratio of the ventilation (RA) appropriately in consideration of indoor air quality;
Fixing the maximum introduction amount when the ventilation (RA) reaches the nearest condition of heating, and maximizing the order introduction amount;
And an error signal is generated when the precooled / preheated air (PA) has an enthalpy higher than the enthalpy of the supply air (SA). The air conditioning system / RTI > 3. The method of claim 2,
When the indoor air quality is eliminated to the minimum value of the control range after the air quality control range of the indoor air 18 is preferentially determined, the proportion of the ventilation (RA) / precooled / preheated air (PA) is increased, the outside air (OA) To determine the optimum mixing ratio of the feed air utilizing the heat sink, characterized in that the ratio of pre-cooling / preheating air (PA) / outside air (OA) is increased and air ratio (RA) is minimized when the air quality reaches the reference value Control method of air conditioning system.

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