KR20050005337A - Hybrid System for Ventilation and Air-Conditioning - Google Patents

Abstract

PURPOSE: A complex air conditioning and ventilating system is provided to reduce energy loss and supply cooled and heated air without using multi-cooler and heater, and reduce a noise and secure pleasantness. CONSTITUTION: A ventilation system for solving air supply and exhaust problems is combined with a ceiling type air conditioner(200). In operating the air conditioner, air flowed in through a heat exchanger for ventilation passes a heat exchanger for an air conditioner together with indoor air sucked into the air conditioner. Rotary speed of a booster fan and an opening angle of a damper(D9) are controlled to maintain a voltage pressure difference between areas.

Description

Hybrid System for Ventilation and Air-Conditioning

The present invention is combined with a ceiling air conditioner (cooler and air conditioner) to solve the problems of air supply and exhaust due to high rise and high insulation, high density of apartments, energy saving and indoor comfort during ventilation By controlling the rotational speed of the air supply fan for positive pressure maintenance and the opening of the air supply duct or the speed of the exhaust fan by the measured pressure feedback of the differential pressure sensor of the controller, the indoor ventilation, the effect of the chimney is eliminated, the indoor positive pressure is maintained, and the energy saving is realized. It is a complex air-conditioning and ventilation system for maintaining indoor comfort, which is distributed to each living space through the piping duct of the ventilation system after being switched to cold or warm air by inhaling indoor air by the ceiling type air conditioner.

The objective function of indoor comfort is the distribution between the noise level of residential space below 35dBA and the octave frequency level between NC 25 to 30 (where NC is Noise Criteria and noise tolerance), and the pollution concentration is based on odor and dust concentration. Hereafter, it is set temperature and relative humidity.

Energy consumption in the residential sector currently accounts for about 25% of the country's total energy consumption and emissions of CO ₂ from energy consumption accounted for 16.7%. Significantly higher building energy consumption per unit area, with the economy improving, while the level considered to be a surge in demand for air conditioning is constantly increasing amount of energy consumption and CO _2.

Recently, as the amount of wind in the house is reduced due to high density of heat and high insulation, natural ventilation becomes difficult, so the minimum ventilation frequency based on 15kW / (hr · m ² ) is 0.5 times / hr.

The minimum outside air standard according to the American Society of Air Conditioning (ASHRAE) standards is defined as the amount of ventilation to maintain the indoor air environment [IAQ (Indoor Air Quality)] after defining the maximum air pollution concentration. do. In addition, the method of determining the indoor air environment (IAQ) includes the ventilation requirement [CFM (cubic feet per minute)], the percentage of outside air supply during the supply, the ventilation demand per person (CFM), the ventilation demand per building area, and the number of ventilation per hour [ACH ( air change per hour)].

Residential air conditioning systems have recently installed indoor units for air conditioning and heating in individual spaces for comfortable air conditioning, and in this case, an air conditioning system using two compressors to solve the efficiency problem arising from cooling load problems is disclosed in Korea. Publication No. 2002-0069442 is disclosed. In addition, there is a problem that adverse effects on the health of the occupants due to the rapid pollution of indoor air when using the air-conditioning air conditioner continuously in a dense residential space without adequate ventilation. In order to solve this problem, the ventilation system of the ceiling type air conditioner is designed to maintain indoor air comfort by forcibly exhausting some of the indoor polluted air by using an exhaust duct disposed between one side of the ceiling type air conditioner and the outside. It is disclosed in Korean Laid-Open Patent Publication No. 2003-0022614.

However, the conventional air conditioner is convenient because the air conditioning required for each living space is convenient, but the capacity of the outdoor unit compressor and the capacity of the condenser heat exchanger increases, the refrigerant piping is very complicated and the installation cost increases. In addition, in case of airtight residential space, if the ventilation problem is not solved, it will adversely affect the health of the indoor occupants, and cause the first problem that becomes very disadvantageous in terms of energy saving when installed and operated independently of the existing ventilation system. As an alternative to solve this problem, the exhaust air duct disposed between one side of the ceiling air conditioner and the outside is forced to exhaust some of the indoor polluted air to maintain the indoor air comfortably. In this case, when the positive pressure is applied to the exhaust duct inlet, or the room pressure fluctuates to the negative pressure, the second problem is caused because the exhaust is not properly made and does not serve the purpose of ventilation.

The present invention, in order to overcome the first problem that occurs when the residential ventilation system and the air conditioning system is installed separately from the air conditioning system, during operation of the air conditioner, the air intake air through the heat exchanger for ventilation with the indoor air sucked into the air conditioner Pass through the heat exchanger to supply the incoming air through the sensible heat exchanger for ventilation, that is, the air supply at a temperature higher than the room temperature (T _r ) or at a lower temperature (heating), as much as the energy required to cool or heat again. You save.

FIG. 1A shows a thermal energy flow diagram of a separate system for separate operation of a ventilation system and an air conditioning system, and FIG. 1B shows a thermal diagram of heat energy flow of a hybrid system. Where T _∞ is the outside air temperature, T _c is the air conditioner discharge temperature during heating and cooling, T _r is the room temperature, T _i is the heat exchanger air supply temperature, T _o is the heat exchanger air exhaust temperature, Q ' _v is the heat exchanger air The flow rate, Q ' _a, represents the total air flow through the air conditioner and Q _ao represents the air intake flow rate.

Thus, the amount of change in room energy over a unit time in a separate system is

Is the same as

Is displayed.

Therefore, the amount of room energy difference per unit time between the two systems is

Becomes That is, it is equal to the quantity multiplied by the ventilation mass flow rate ρQ ' _v and the difference between the indoor entrance and exit enthalpy C _p (T _i -T _r ) in the ventilation heat exchanger.

However, it is structurally complicated to arrange all of the air supply passing through the ventilation system to the air conditioner inlet without heat transfer by means of a duct or the like, as shown in the composite system of Figure 1b, so as shown in Figure 1c of the present invention to the ceiling of the living room In the living room diffuser connected to the ventilation duct system near the installed air conditioner, it enters the air conditioner inlet with the indoor air just like a short circuit. In this case, the exhaust vent damper for the living room connected to the ventilation system is automatically closed.

In addition, the present invention follows the path ₂ as shown in FIG. 2 to solve the second problem, that is, to increase the local air supply and exhaust in a locally contaminated or locally negative pressure space. By controlling the rotational speed of the booster 와 and the opening angle of the damper to move along the path ₃ again, the voltage difference between the indoor space at the supply side and the outlet of the supply (( P) and the voltage difference between the indoor and outdoor spaces (e.g. corridor, exhaust pipe exit, chimney) on the exhaust side ( P) Maintain P _set and let flow rate be Q ₃ .

The energy consumed by the supply or exhaust fans Proportional to P × Q and noise power at the same speed Since it is proportional to P ² × Q, the voltage difference is sequentially passed through the path (Path ₂ ) and the path (Path ₃ ). Maintaining P _set causes the air supply or exhaust fan to operate at low voltage differences with similar power consumption as the supply and exhaust paths (Path ₁ ), resulting in very low noise in the air conditioning system, The problem of flow rate reduction of

Therefore, the second object of the present invention is to eliminate the effects of indoor sound pressure and the common exhaust duct chimney effect, which is a problem in the air supply and exhaust of the airtight apartment house, to quickly ventilate locally contaminated air to ensure comfort and to reduce indoor noise. To minimize, low noise, high efficiency active air supply and air conditioning system employing a composite booster fan to maintain a constant voltage difference between the above-mentioned zones through the rotational speed control of the air supply and exhaust booster fan and the air supply and exhaust damper opening angle control. To provide.

Figure 1a is a schematic diagram showing a separate air conditioning and ventilation system according to the prior art,

FIG. 1B is a schematic diagram showing an ideal hybrid air conditioning and ventilation system in energy efficiency;

Figure 1c is a schematic diagram showing a multi-compound air conditioning and ventilation system according to the present invention,

2 is a graph showing a change in performance characteristics during the control of the booster 용 for air conditioning and ventilation according to the present invention;

3 is a layout view showing the main parts of the composite air conditioning and ventilation system according to the present invention;

Figure 4 is a cross-sectional view showing the configuration of the main part of the ceiling air conditioner according to the present invention.

Hereinafter, an embodiment of the complex air conditioning and ventilation system according to the present invention will be described with reference to FIGS. 3 and 4. FIG. 3 shows a ceiling air conditioning unit provided in the complex air conditioning and ventilation system according to the present invention together with the main components of the complex air conditioning and ventilation system, and FIG. 4 is a detailed view of the ceiling air conditioning unit of FIG.

As shown in FIG. 3, the complex air conditioning and ventilation system 100 includes an exhaust duct ED ₁ for heat exchange and an exhaust duct ED _{2 and} ED ₃ for each bathroom B1 and B2 whose outlets are exposed to the outside. ; A heat exchanger (H) connected to the exhaust duct (ED ₁ ) and controlled by a controller (not shown); Connected to the heat exchanger (H) and controlled by the control unit (Fan ₁ ) and the exhaust fan (Fan ₂ ) for the variable speed, the living room (E) as well as each bathroom (B1, B2) and Branch conduits (L1-1, L1-2, L1-3, L1-4) of the main air supply conduit (L1) provided in each of the rooms (R1, R2, R3) with an air supply fan (Fan ₁ ) intervening. , L1-5, L1-6) and a plurality of diffusers F1, F2, F3, F4, F5, F6 connected to the outlet of the air supply fan ₁ via the main air supply conduit L1. ); Living room (E) as well as each room (R1, R2, R3) is installed on, for an exhaust fan (Fan ₂₎ a branch conduit (L2-1, L2-2, L2 of the main exhaust conduit (L2) for interposing a way A plurality of hoods (suction parts) S1, S2, S3, S4 connected to the inlet of the exhaust fan ₂ via -3, L2-4 and the main exhaust conduit L2; Hoods (suction parts) S5 and S6 connected to the exhaust ducts ED _{2 and} ED ₃ for the respective bathrooms B1 and B2: to the diffusers F1, F2, F3, F4, F5 and F6. A plurality of motor drives provided in the middle of connected branch supply conduits (L1-1, L1-2, L1-3, L1-4, L1-5, L1-6) and controlled by the control unit and whose opening angle is variable. The motor-driven type is provided in the middle of the exhaust branch conduit (L2-1) connected to the type dampers (D1, D2, D3, D4, D5, D6) and the hood (S1) and controlled by the controller. Damper D9; Indoor pressure detectors (P1, P2, P3, P4, P5, P6) installed in each bathroom (B1, B2) and each room (R1, R2, R3) as well as the living room (E) and connected to the control unit to send a measurement signal. ); A detector (V) installed in the living room (E) and connected to a control unit to detect temperature, dust, odor, and CO ₂ that send a measurement signal; And class appointed fan (Fan ₁₎ class appointed fan (Fan ₁₎ of the outlet side near the main class appointed class appointed pressure is attached to the conduit (L1) detector (P7), the outdoor space to detect the pressure of the outlet side of the Bypass near the outlet side of bypass 홴 for detecting pressure at the outlet side of exhaust pressure detector P8 and bypass 홴 (Fan ₃ ) installed near exhaust duct ED1 to detect pressure It includes a bypass pressure detector (P9) mounted to the conduit (L3), and the air in the living room (E) during the heating and cooling is sucked into the cold or hot air and then again the living room (E) as well as the air supply conduit ( The suction side is distributed to the living room so as to be distributed to each living space B1, B2, R1, R2, and R3 through L1), and the discharge side is distributed to the living room and air supply conduit L1, and controlled by the controller. It further includes a ceiling type air conditioner (200) receiving.

Here, the class appointed fan (Fan ₁₎ is interposed in the middle-level appointed main duct (L1) is the class I appointed fan chamber side branch duct (L1-1) of the respective bathroom at the exit side of (Fan ₁₎ with ( B1, B2) and branch air supply branch conduits L1-2, L1-3, L1-4, L1-5, L1-6 on the side of the rooms R1, R2, R3 are connected to the upstream side, and the exhaust In the main exhaust conduit L2 with the fan ₂ interposed therein, the branch conduit L2-1 on the living room E side from the inlet side of the exhaust fan ₂ is provided for each bathroom B1, It is connected downstream from B2) and exhaust branch conduits L2-2, L2-3, and L2-4 on the sides of the rooms R1, R2, and R3.

In addition, a part of the discharge side of the ceiling type air conditioner is controlled by the control unit via the bypass conduit L3 in which a bypass fan (Fan ₃ ) whose rotation speed is variable is interposed. For air supply on the downstream side and at each of the bathrooms B1, B2 and the rooms R1, R2, R3 from a position downstream from the position where the branch air supply conduit L1-1 is connected to the main air supply conduit L1. Branch conduits (L1-2, L1-3, L1-4, L1-5, L1-6) are connected to the main air supply conduit L1 at an upstream side from the position where they are connected to the main air supply conduit L1. Connected.

In addition, the bypass conduit L3 is provided with a motor-driven bypass damper D ₈ controlled by the controller at an inlet side of the bypass fan ₃ , and the bypass conduit L3. The main air supply conduit between the position where) is connected to the main air supply conduit L1 and the position where the living room E side branch conduit L1-1 is connected to the main air supply conduit L1. At L1, a motor-driven main damper D ₇ controlled by the control unit is interposed.

The control unit controls the rotational speed of the fan 용 (Fan ₁ ) and the opening angle of the automatic damper at the time of local air supply, and each living room (E), bathroom (B1, B2), room (R1, R2, R3). The average pressure is obtained by averaging the pressures measured by the pressure detectors (P1, P2, P3, P4, P5, and P6) installed in the), and the differential pressure between the average pressure and the pressure supply pressure detector (P7) for air supply is shown in FIG. As shown in the figure, a predetermined pressure (a path (path2), a path3) P _set ), and the pressure installed in each living room (E), bathroom (B1, B2), room (R1, R2, R3) to maintain the rotation speed of the exhaust fan for local exhaust. The average pressure is obtained by averaging the pressures measured by the detectors P1, P2, P3, P4, P5, and P6, and the differential pressure between the average pressure and the exhaust pressure detector P8 is maintained at a predetermined pressure. ,

In the ventilation mode, the air supply fan (Fan ₁ ) and the exhaust fan (Fan ₂ ) are operated, the ceiling type air conditioner 200 is stopped, the bypass damper (D ₈ ) is closed, and the main damper ( D ₇ ) is fully open.

In addition, the main damper (D ₇ ) is closed so that the air supply is sent only to the living room (E) in the heating and cooling mode, the hood damper (D ₉ ) of the living room (E) is also blocked by the control unit so that fresh air only to the living room (E) Supplied to the ceiling air conditioner 200, the inflow flow rate Q _ao is mixed with the supplied air amount Q ' _v (see FIG. 1C) and the heat exchanger of the ceiling air conditioner 200 is lowered in the pollutant concentration. After cooling, heating or dehumidifying, some of the flow rate (Q ' _c ) is discharged back to the living room, and the remaining flow rate (Q' _r = Q ' _v + Q' _ao -Q ' _c ) is bypassed through the damper (D ₂ ). It is distributed to each bathroom and room by Fan ₃ .

At this time, since the blowing flow rate Q ' _a of the ceiling type air conditioner 200 becomes equal to Q' _v + Q ' _ao and Q' _v + Q ' _c , the flow rate Q' _r blown to the remaining space. Is theoretically equivalent to Q ' _v . At this time, the exhaust fan (F ₂ ) is connected to the control unit, and Q, which maximizes the ventilation amount (Q ' _v ) based on the temperature, dust, odor, and the spatial average pollution value from the CO ₂ detector (V). such that the energy loss is minimized with proper ventilation in 20-30% of, and in _a, generally, Q _'a.

Further, in order to maintain the pressure in the living room E at a positive pressure, the rotation speed of the bypass Fan (Fan ₃ ) is controlled to drive Q ' _v ≥ Q' _r . At this time, if the opening of one or more dampers of the dampers (D ₂ to D ₆ ) is increased by detecting the pollution concentration above the maximum allowable contamination level or the need for rapid cooling and heating in an individual space other than the living room (E), the flow to the other space may be reduced. since the mean outside pressure and a bypass fan (Fan ₃₎ outlet pressure (P ₉₎ area of the flow rate required in addition to performing the constant pressure control, so that the differential pressure is kept constant difference with the of space that the air supply in order to prevent this, The air supply is fixed to minimize the power consumption of the bypass fan (Fan ₃ ). In this case, the air supply amount of the air supply fan (Fan ₁ ) is also increased in accordance with the increase in the flow rate passing through the bypass fan (Fan ₃ ) to maintain the pressure in the living room (E) at a positive pressure.

In addition, as shown in FIG. 3, an embodiment of the ceiling air conditioner 200 including the outdoor unit 300, the bypass conduit L3, and the bypass fan ₃ will be described with reference to FIG. 4. Is as follows. 4, the ceiling air conditioner of FIG. 3 is indicated as 200. The ceiling type air conditioner 200 is installed in the main body 11 and the main body 11 through which the bottom surface is opened and penetrates the hole 2 formed in the ceiling 1 and is inserted into the ceiling. After the heat exchanger passes through the heat exchanger by mixing and sucking the air through the annular heat exchanger (12) or a heater for cooling the air, the fresh air supplied to the living room and the indoor contaminated air, some of the flow rate is discharged ( 16 is discharged back into the room via a duct 18, which is installed radially inwardly of the annular heat exchanger 12 so as to generate a blowing force to be distributed to another space through the duct 18 installed on the rear surface of the heat exchanger. A blower fan 13 and a motor 14 fixed to the main body to rotate the blower fan, coupled to the bottom surface side of the main body, are exposed to the room, and face the blower fan 13, thereby providing air to the room side. The suction grille (15) for suction are disposed at the center is configured to include a front panel 17, a discharge port 16 formed in the circumferential direction, four of the suction grille.

In addition, although the description of the ventilation of the kitchen is omitted from the description of the combined air conditioning and ventilation system, when the kitchen ventilation is applied to the air conditioning system, the exhaust of the bathroom and the exhaust of the kitchen are exhausted by using a separate exhaust fan. In addition, it is possible to use the existing air supply or the booster supply air supply of the kitchen air supply.

It is apparent to those skilled in the art that the present invention is not limited to the above-described embodiments and that various modifications and variations can be made without departing from the spirit and scope of the present invention.

The complex air conditioning and ventilation system of the present invention configured as described above reduces the unavoidable energy loss when installing and operating the air conditioning system and the ventilation system independently, maintains the positive pressure of the high-tight residential space, and maintains the ventilation system with minimal power. It is possible to control the speed of air, and it is effective to supply fresh and cooled air by using only one central air conditioner and air supply duct for ventilation system in the whole living space without using multi type air conditioner.

The combined air conditioning and ventilation system of the present invention is intended to provide a local air supply or exhaust for augmenting a locally contaminated, locally negatively pressured, or locally causing space in the common exhaust duct chimney effect. The differential pressure between the outlet pressure of the outlet and the average pressure of the interior space or the differential pressure between the outlet duct (for example, corridor, exhaust outlet, chimney) side pressure of the exhaust conduit connected to the exhaust fan and the average pressure of the interior space after along the path (path _2), back path (path ₃₎ the thus by controlling the rotational speed of the star appointed fan rotation speed and the air supply side of the fan for the opening angle or the exhaust of the damper to move, the pressure difference is a predetermined Pressure difference ( P _set ) while maintaining the flow rate Q ₃ in FIG. 2.

This control results in very low noise in the air conditioning system because the air supply or exhaust fan operates at a low voltage difference with similar power consumption as in the path ₁ of FIG. 2 during local air supply and local exhaust. In addition, it solves the problem of reducing the flow to other spaces and at the same time, it is possible to quickly ventilate the indoor space to ensure comfort.

In addition, in the heating and cooling mode, the main damper (D ₇ ) is closed so that the air supply is sent only to the living room, and the suction damper (D ₉ ) of the living room is also blocked by the control unit so that fresh air is supplied only to the living room. ₂₎ a temperature is connected to the control unit sends a measurement signal, dust, odor, CO ₂ detector space average contamination levels in ventilation rate (Q relative to the from the "maximum value of _v) is Q, _a, and, in general, Q _'a 20-30% of energy loss should be minimized with proper ventilation. In addition, to maintain the positive pressure in the living room, the speed of the bypass fan (Fan ₃ ) is controlled to drive Q ' _v ≥ Q' _r . In this case, increasing the opening degree of one or more dampers of D ₂ ~ D _{6 due} to the detection of pollution concentrations above the maximum allowable pollution concentration or the need for rapid cooling and heating in individual spaces outside the living room reduces the flow to other spaces. Constant pressure control is carried out so that the differential pressure, which is the difference between the average pressure of the spaces and the bypass fan (P ₃ ) outlet pressure (P ₉ ), is kept constant. It has the effect of minimizing the consumption power of Fan ₃ .

Claims (3)

In the combined air conditioning and ventilation system 100, An exhaust duct ED ₁ for the heat exchanger and an exhaust duct for each bathroom in which the outlet is exposed to the outside; A heat exchanger (H) connected to the exhaust duct for the heat exchanger (ED ₁ ) and controlled by a controller (not shown); Air supply fan and exhaust fan, which are connected to the heat exchanger (H) and controlled by the control unit, are installed in each bathroom and each room as well as a living room, and the main air supply fan is interposed in the middle of the air supply fan. A plurality of diffusers connected to an outlet of the air supply fan via a branch conduit of the conduit and a main air supply conduit; A plurality of hoods provided in each room as well as a living room and connected to the inlet of the exhaust fan via a branch conduit of the main exhaust conduit and a main exhaust conduit interposed between the exhaust fan; Hoods connected to the exhaust ducts for the bathrooms: a plurality of motor-driven dampers D1, D2, D3, which are provided in the middle of the branch supply conduit connected to the diffusers and are controlled by the control unit and whose opening angles are variable. D4, D5 and D6) and a motor-driven damper (D9) provided in the middle of the living room exhaust branch conduit connected to the living room hood and controlled by the control unit to change the opening angle; An indoor pressure detector (P1. P2, P3, P4, P5, P6) installed in each bathroom and each room as well as a living room and connected to a control unit to transmit a measurement signal; A detector (V) installed in the living room and connected to the control unit to detect temperature, dust, odor, and CO ₂ that send a measurement signal; And an air supply pressure detector (P7) mounted in a main air supply conduit near the outlet side of the air supply fan to detect the pressure at the outlet side of the air supply fan, and an exhaust duct (ED1) to detect the pressure in the outdoor space. An exhaust pressure detector P8 provided in the vicinity and a bypass pressure detector P9 mounted to a bypass conduit near the outlet side of the bypass 위해 for detecting the pressure at the outlet side of the bypass 하고; And, when cooling and heating, the suction side is distributed to the living room so that the air in the living room is sucked into the cold or hot air and then distributed to each bathroom and the room through the air supply conduit again, and the discharge side is the living room and the air supply conduit Is further distributed in, and further comprises a ceiling air conditioner 200 is controlled by the control unit, Here, in the main air supply conduit interposed in the middle of the air supply fan, a branch conduit on the living air supply side at the outlet side of the air supply fan is connected to an upstream side of each of the bathroom and room supply branch conduits. In the main exhaust conduit intervening in the exhaust fan, a branch conduit on the living room side from the inlet side of the exhaust fan is connected to the downstream side of the exhaust conduit on each side of the bathroom and the room. A part of the discharge side of the ceiling type air conditioner is controlled by the control unit via a bypass conduit interposed between the bypass coils having a variable speed of rotation, and the living air supply branch conduit is connected to the main air supply conduit. A branch conduit for air supply is downstream from the position where it is connected and the branch conduits for air supply at each of the bathrooms and rooms are connected to the main air supply conduit upstream than the position where the conduit for air supply is connected to the main air supply conduit, The bypass conduit includes a motor-driven bypass damper D ₈ controlled by the controller at an inlet side of the bypass ,, and the bypass conduit connected to the main air supply conduit. And a motor-driven main damper (D ₇ ) controlled by the control unit in the main air supply conduit between the position where the living branch branch conduit is connected to the main air supply conduit, The control unit obtains the average pressure by averaging the pressures measured by the pressure detectors installed in each living room, bathroom, and room in adjusting the rotational speed of the air supply fan and the opening angle of the automatic damper during local air supply. The pressure difference between the average pressure and the air supply pressure detector P7 passes through the path (path 2) and path (path 3) in order to obtain a predetermined pressure ( P _set ), and in the case of local exhaust, in adjusting the rotational speed of the exhaust fan, the average pressure is obtained by averaging the pressures measured by the pressure detectors installed in each living room, bathroom, and room. The differential pressure between the average pressure and the exhaust pressure detector P8 is maintained at a predetermined pressure. In the ventilation mode, the air supply fan and the exhaust fan are operated, the ceiling air conditioner 200 is stopped, the bypass damper D ₈ is closed, and the main damper D ₇ is completely opened. In the heating and cooling mode, the main damper (D ₇ ) is closed so that the air supply is sent only to the living room, and the suction damper (D ₉ ) of the living room is also blocked by the control unit so that fresh air is supplied only to the living room, and to the ceiling type air conditioner 200. influent flow rate (Q _ao) will supply the air amount (Q _'v) and a mixture through the heat exchanger is cooling or heating or dehumidifying some flow back into the living room of the ceiling air conditioner 200 to the lower pollution levels state (Q' _c ) Is discharged, and the remaining flow rate (Q ' _r = Q' _v + Q ' _ao -Q' _c ) is distributed to each bathroom and room by a bypass 거쳐 via a damper (D ₂ ) And ventilation system. The method of claim 1, In the heating and cooling mode, to maintain the positive pressure in the living room, the number of rotations of the bypass fan is controlled so that Q ' _v ≥ Q' _r , At this time, if the increase in the opening degree of one or more dampers of the dampers (D ₂ ~ D ₆ ) due to the detection of pollution concentrations above the maximum allowable pollution concentration or the need for rapid cooling and heating in individual spaces other than the living room, the average pressure and bypass of the air supply space Constant pressure control is carried out so that the differential pressure, which is a difference from the outlet pressure P ₉ of the fan, is kept constant, and the air supply amount other than the space of the additionally required flow rate is fixed, and the air supply amount of the air supply fan also passes through the bypass fan. Composite air conditioning and ventilation system, characterized in that to increase in accordance with the increase in the flow rate. The method according to claim 1 or 2, The ceiling air conditioner 200 includes an outdoor unit 300, and A main body 11 whose bottom surface is opened and is inserted into the ceiling through the hole 2 formed in the ceiling 1; An apparatus for heating air through an annular heat exchanger 12 or a heater installed in the main body 11 to cool the air through heat exchange with a refrigerant; After passing through the heat exchanger by mixing and sucking the fresh air supplied to the living room and the contaminated air inside the room, some flow rates are discharged back to the room via the discharge port 16, and a part of the duct installed at the rear of the heat exchanger ( A blower 13 installed radially inwardly of the annular heat exchanger 12 so as to generate a blowing force so as to be distributed to another space again through 18); A motor 14 fixed to the main body to rotate the blower fan, A suction grill 15 coupled to the bottom surface side of the main body and exposed to the room and facing the blower fan 13 to suck air from the indoor side is disposed at the center, and a plurality of discharge ports 16 are formed around the suction grill. And a front panel (17) formed with the air conditioning and ventilation system.