JP4195651B2 - Air conditioning and ventilation system - Google Patents

Description

  The present invention relates to an air-conditioning / ventilation system using geothermal heat or exhaust heat of ventilation.

  Conventionally, a heat pump system for heating using exhaust heat exhausted by indoor ventilation as a heat source is known (for example, see Patent Document 1). In such a heat pump system for heating, an evaporator of a heat pump is arranged in parallel on the blowing side of a ventilation fan provided on the ceiling, and the exhaust heat of the ventilation is absorbed by the evaporator, and this heat is dissipated by the condenser of the heat pump. Configured to heat indoors.

  Conventionally, a natural cooling system using geothermal heat is known. Describing the configuration of this natural cooling system, a fan for circulating indoor air is provided on the back of the ceiling, and a heat exchanger is provided in parallel with the fan. And the heat exchanger is connected with the underground heat exchanger embed | buried under the ground through the circulation circuit through which a heat medium circulates. The heat medium is cooled by dissipating heat into the ground when passing through the underground heat exchanger. The cooled heat medium passes through a heat exchanger arranged in parallel with the fan, so that the air blown by the fan is cooled, thereby cooling the room.

Here, when both the heating heat pump system and the natural cooling system are installed in a house, the ventilation fan and the evaporator for the heating heat pump system and the fan and the heat exchanger for the natural cooling system are installed on the ceiling. Must. For this reason, a considerable space is required on the back of the ceiling, and the number of parts is large and costly.
Japanese Patent Laid-Open No. 61-197933 (2nd page, FIG. 3)

  The present invention has been made in view of the above background, and an object of the present invention is to provide an air conditioning / ventilation system that can be constructed at a low cost by reducing the number of parts and reducing the number of components.

  In order to achieve the above object, an air conditioning / ventilation system according to the present invention includes a ventilation device in which a ventilation fan and a ventilation heat exchanger are housed in a housing, a ground heat exchanger embedded in the ground, and a room. A heat pump connected to a radiator for heating, a circulation circuit for circulating a heat medium so as to pass through a ground heat exchanger, a ventilation heat exchanger, and a heat pump, and a portion on the suction side of the casing by the ventilation fan Connected through the first ventilation path to the indoor exhaust port for exhausting indoor air, and connected to the blowing side portion of the enclosure by the ventilation fan via the second ventilation path, the air to the outdoors An outdoor exhaust port for exhausting air, an outdoor air supply port for taking in outside air from the outside connected to a portion of the housing on the suction side by the ventilation fan through a third ventilation path, and a blowout by the ventilation fan of the enclosure Side part Is connected via a fourth air passage, the and an indoor air inlet for blowing outside air indoors.

  And while maintaining the communication of the indoor exhaust port and the outdoor exhaust port through the first and second ventilation paths to the housing, the outdoor air supply port through the third and fourth ventilation channels to the housing The first state where communication between the indoor air supply port and the indoor air supply port is blocked, and the communication between the outdoor air supply port and the indoor air supply port via the third and fourth ventilation paths with respect to the housing is maintained. Airflow switching means switchable between the second state where communication between the indoor exhaust port and the outdoor exhaust port via the first and second airflow passages is blocked, and during the heating operation, the heat pump is operated, Switching to the first state by the air path switching means, and switching to the second state by the air path switching means without operating the heat pump during the cooling operation.

  According to this configuration, during heating operation, indoor air is exhausted from the indoor exhaust port through the first ventilation path, the ventilation device, the second ventilation path, and the outdoor exhaust port by the ventilation fan. And the exhaust heat of ventilation is absorbed by the ventilation heat exchanger provided in the ventilator, and the heat pump uses the geothermal heat absorbed by the underground heat exchanger and the exhaust heat of ventilation absorbed by the ventilation heat exchanger. Heating is performed indoors by a radiator. Further, during cooling operation, outdoor outdoor air is supplied indoors from the outdoor air supply port through the third ventilation path, the ventilator, the fourth ventilation path, and the indoor air supply opening by the ventilation fan. Then, the heat medium radiated and cooled by the underground heat exchanger passes through the ventilation heat exchanger, whereby the outside air blown by the ventilation fan is cooled, thereby cooling the room.

  As described above, the present invention is configured by one ventilation fan and one ventilation heat exchanger, so that the required space is small and the number of parts can be reduced, thereby reducing the cost. be able to.

  Further, the air path switching means includes a first damper provided on the suction side of the ventilation fan in the housing and a second damper provided on the blowing side of the ventilation fan in the housing. It is configured to select and close either the connection port of the first ventilation path or the connection port of the third ventilation path with respect to the housing, and the second damper is connected to the connection port of the second ventilation path with respect to the housing. It is preferable that one of the connection ports of the four ventilation paths is selected and closed.

  According to such a configuration, in order to open and close the connection ports of the first to fourth ventilation paths with respect to the casing, one connection is provided for each connection port, and a total of four dampers are provided. Since it is possible to switch between the first state and the second state with a single damper, the number of parts can be further reduced, and the cost can be reduced.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram of the first embodiment, and FIG. 2 is a schematic diagram of the second embodiment.

  As shown in FIG. 1, the air conditioning and ventilation system according to the first embodiment includes a ventilation device 1 in which a ventilation fan 12 and a ventilation heat exchanger 13 are housed in a housing 11, and a ground buried in the ground. The heat exchanger 2, the heat pump 3 connected to the radiator 31 that heats the room via a hot water pipe (not shown), the underground heat exchanger 2, the ventilation heat exchanger 13, and the heat pump 3 are used. And a circulation circuit 4 for circulating the heat medium.

  The heat pump 3 includes a refrigerant circulation circuit 3e that circulates refrigerant through the evaporator 3a, the compressor 3b, the condenser 3c, the expansion valve 3d, the evaporator 3a, the compressor 3b, the condenser 3c, and the expansion valve 3d. It consists of.

  The circulation circuit 4 includes a pipe line 4a connecting the outlet of the underground heat exchanger 2 and the inlet of the ventilation heat exchanger 13, and a pipe line connecting the outlet of the ventilation heat exchanger 13 and the inlet of the evaporator 3a of the heat pump 3. 4b and a pipe 4c that connects the outlet of the evaporator 3a and the inlet of the underground heat exchanger 2 and circulates by the operation of a pump 4d provided in any one of the pipes (the pipe 4a in the illustrated example). A heat medium is circulated in the circuit 4.

  The indoor hall H is provided with an indoor exhaust port 51 for exhausting indoor air. The indoor exhaust port 51 is connected to the suction side portion of the housing 11 by the ventilation fan 12 via the first ventilation path 61. An outdoor exhaust port 52 is provided on the outer wall of the house 7. The outdoor exhaust port 52 is connected to a portion of the housing 11 on the blowing side by the ventilation fan 12 via the second ventilation path 62.

  In addition, an outdoor air supply port 53 for taking in outside air from the outside is provided on the outer wall of the house 7. The outdoor air supply port 53 is connected to the suction side portion of the housing 11 by the ventilation fan 12 via the third ventilation path 63. In the hall H, an indoor air supply port 54 is provided. The indoor air supply port 54 is connected to a portion of the housing 11 on the blowing side by the ventilation fan 12 via a fourth ventilation path 64.

  A first damper 81 is provided on the suction side of the ventilation fan 12 in the housing 11. The first damper 81 is configured to select and close either the connection port of the first ventilation path 61 or the connection port of the third ventilation path 63 with respect to the housing 11. Further, a second damper 82 is provided on the blowing side of the ventilation fan 12 in the housing 11. The second damper 82 is configured to select and close either the connection port of the second ventilation path 62 or the connection port of the fourth ventilation path 64 with respect to the housing 11. In the first embodiment, the first damper 81 and the second damper 82 constitute air path switching means. The first damper 81 and the second damper 82 are switched and controlled by a controller (not shown) as will be described later.

  In addition to the dampers 81 and 82, the controller controls the ventilation fan 12, the pump 4 d of the circulation circuit 4, and the compressor 3 b of the heat pump 3. In detail, during the heating operation, the controller drives the ventilation fan 12 and the pump 4d and drives the compressor 3b to operate the heat pump 3. In addition, the first damper 81 is switched so as to close the connection port of the third ventilation path 63 with respect to the housing 11, and the second damper 82 is switched so as to close the connection port of the fourth ventilation path 64 with respect to the housing 11. This state is the first state of the air path switching means.

  Further, the controller drives the ventilation fan 12 and the pump 4d during the cooling operation, but the compressor 3b is not driven, and the heat pump 3 becomes inoperative. Further, during the cooling operation, the first damper 81 is switched so as to close the connection port of the first ventilation path 61 to the housing 11, and the second connection is performed so as to close the connection port of the second ventilation path 62 to the housing 11. The damper 82 is switched. This state is the second state of the air path switching means.

  Next, the operation of the first embodiment will be described.

  First, during the heating operation, the communication between the third ventilation path 63 and the communication of the fourth ventilation path 64 with respect to the housing 11 is blocked by switching between the first and second dampers 81 and 82. Indoor air is exhausted to the outside via the indoor exhaust port 51, the first ventilation path 61, the ventilator 1, the second ventilation path 62, and the outdoor exhaust port 52.

  The heat medium flowing through the circulation circuit 4 absorbs geothermal heat when passing through the underground heat exchanger 2. The heat medium passes through the ventilation heat exchanger 13 in the ventilation device 1 and absorbs exhaust heat of ventilation. Thereafter, the heat medium passes through the evaporator 3a of the heat pump 3, and evaporates and vaporizes the refrigerant circulating in the heat pump 3. The heat pump 3 supplies the refrigerant from the evaporator 3 a to the condenser 3 c via the compressor 3 b and heats the hot water circulating through the hot water pipe connected to the radiator 31. Each radiator 31 heats each room R by heat radiation. The air in each room R heated by the radiator 31 passes through the undercut of the door D and flows into the hole H. And it is attracted | sucked by the ventilation apparatus 1 from the indoor exhaust port 51 provided in the hall | hole H, and the exhaust heat of ventilation is absorbed by a heat medium with the ventilation heat exchanger 13 as mentioned above. Each room R is provided with a ventilation port 9 from which outside air is supplied indoors. The solid arrows in the figure indicate the air flow during the heating operation.

  Further, during the cooling operation, the communication between the first ventilation path 61 and the second ventilation path 62 with respect to the housing 11 is blocked by switching between the first and second dampers 81 and 82, so that the ventilation fan 12 Outside air is supplied indoors via the outdoor air inlet 53, the third ventilation path 63, the ventilator 1, the fourth ventilation path 64, and the indoor air inlet 54.

  The heat medium flowing through the circulation circuit 4 absorbs heat from the outside air when passing through the ventilation heat exchanger 13. Then, the heat medium flows through the evaporator 3a of the heat pump 3 in the inoperative state and flows to the underground heat exchanger 2. During the cooling operation (summer season), the temperature of the geothermal heat is lower than the temperature of the outside air, so that the heat medium dissipates heat into the ground when passing through the underground heat exchanger 2. The heat medium cooled by heat radiation returns to the ventilation heat exchanger 13 and again absorbs the heat of the outside air. For this reason, the outside air deprived of heat is supplied to the indoor hall H from the indoor air supply port 54. The outside air supplied to the hall H passes through the undercut of the door D and flows to each room R. And it exhausts outside via the ventilation opening 9 provided in each room R. The dotted arrows in the figure indicate the flow of outside air during the cooling operation.

  Next, a second embodiment will be described with reference to FIG.

  The air conditioning / ventilation system of the second embodiment has the same configuration as that of the first embodiment except that the air path switching means is different, and the same reference numerals are given. The air path switching means of the second embodiment is composed of first to fourth dampers 83, 84, 85, 86. The first damper 83 is provided so as to open and close the connection port of the first ventilation path 61 with respect to the housing 11. Similarly, the second to fourth dampers 84, 85, 86 are provided so as to open and close the connection ports of the second to third ventilation paths 62, 63, 64 to the housing 11.

  During the heating operation, the first damper 83 and the second damper 84 open both connection ports of the first and second ventilation paths 61 and 62 to the casing 11, and the third damper 85 and the fourth damper 86 provide the casing. 11, both connection ports of the third and fourth ventilation paths 63 and 64 are closed. This state is the first state of the air path switching means of the second embodiment, and the indoor air is sent from the ventilation fan 12 to the indoor exhaust port 51, the first ventilation path 61, the ventilation device 1, and the second ventilation path. The air is exhausted to the outside through 62 and the outdoor exhaust port 52.

  During the cooling operation, the third damper 85 and the fourth damper 86 open both connection ports of the third and fourth ventilation paths 63 and 64 to the housing 11, and the first damper 83 and the second damper 84 Both connection ports of the first and second ventilation paths 61 and 62 with respect to the housing 11 are closed. This state is the second state of the air path switching means of the second embodiment, and the outside air is supplied from the ventilation fan 12 to the outdoor air supply port 53, the third air passage 63, the ventilator 1, and the fourth air passage 64. And the indoor air supply port 54.

  According to the air conditioning / ventilation system of both the first and second embodiments, although the heating heat pump system using exhaust heat of ventilation and the natural cooling system using geothermal heat are used in combination, ventilation is performed. One fan 12 and one ventilation heat exchanger 13 are sufficient, so that less space is required and the number of parts can be reduced to reduce costs.

  In addition, according to the first embodiment, compared to the second embodiment, the number of dampers as the air path switching means is composed of two halves, so the number of parts can be further reduced, Cost can be reduced.

The schematic diagram of the 1st Embodiment of this invention. The schematic diagram of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ventilator, 11 ... Housing, 12 ... Ventilation fan, 13 ... Ventilation heat exchanger, 2 ... Ground heat exchanger, 3 ... Heat pump, 3a ... Evaporator, 3b ... Compressor, 3c ... Condenser, 3d ... Expansion valve, 3e ... refrigerant circulation circuit, 31 ... radiator, 4 ... circulation circuit, 51 ... indoor exhaust port, 52 ... outdoor exhaust port, 53 ... outdoor air supply port, 54 ... indoor air supply port, 61 ... first ventilation Road, 62 ... 2nd ventilation path, 63 ... 3rd ventilation path, 64 ... 4th ventilation path, 7 ... House, 81-86 ... Damper, 9 ... Ventilation opening.

Claims (2)

A ventilation device comprising a ventilation fan and a ventilation heat exchanger housed in a housing;
An underground heat exchanger buried in the ground,
A heat pump connected to a radiator that heats the room;
A circulation circuit for circulating the heat medium so as to pass through the underground heat exchanger, the ventilation heat exchanger, and the heat pump;
An indoor exhaust port for exhausting indoor air, connected to a portion of the housing on the suction side by the ventilation fan via a first ventilation path;
An outdoor exhaust port for exhausting air to the outside, connected to a portion on the blowing side of the housing by the ventilation fan via a second ventilation path;
An outdoor air inlet for taking in outside air from the outside, connected to a portion on the suction side of the housing by the ventilation fan via a third ventilation path;
An indoor air supply port for blowing outside air indoors, connected to a portion on the blowing side by the ventilation fan of the housing via a fourth ventilation path;
The outdoor air inlet and the indoor through the third and fourth air passages with respect to the housing while maintaining the communication between the indoor air outlet and the outdoor air outlet through the first and second air passages with respect to the housing The first state with respect to the housing is maintained while maintaining the communication between the outdoor air inlet and the indoor air inlet through the third and fourth ventilation paths with respect to the housing in the first state in which the communication of the air inlet is blocked. And an air path switching means switchable between a second state in which communication between the indoor exhaust port and the outdoor exhaust port through the second ventilation channel is blocked,
During heating operation, the heat pump is operated and switched to the first state by the air path switching means. During cooling operation, the air pump is switched to the second state by the air path switching means without operating the heat pump. Ventilation system. The air path switching means includes a first damper provided on the suction side of the ventilation fan in the housing and a second damper provided on the blowing side of the ventilation fan in the housing,
The first damper is configured to select and close either the connection port of the first ventilation path or the connection port of the third ventilation path to the housing,
The air conditioning / ventilation according to claim 1, wherein the second damper is configured to select and close one of a connection port of the second ventilation path and a connection port of the fourth ventilation path with respect to the housing. system.

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