JP2005308313A - Air conditioning system using ocean deep water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning system using ocean deep water for comfortably conditioning air at a humidity of 60% RH or lower while saving energy by controlling a temperature and a humidity in an air conditioned room without using a dehumidifier and a reheating heater. <P>SOLUTION: When a humidity in the air conditioned room 1 detected by a humidity sensor 18 is a set value or lower, temperature control operation is performed for adjusting the temperature in the air conditioned room to a predetermined value by controlling the amount of cold water to be supplied to a heat exchanger 5 of an air-conditioner 2 in accordance with a difference between a temperature detected by a temperature sensor and a set temperature while keeping the amount of air to be blown from the air-conditioner 2. When the humidity detected by the humidity sensor 18 exceeds the set value, dehumidifying operation is performed for dehumidification by lowering the temperature of air in an air passage while keeping the amount of cold water to be supplied to the heat exchanger 5 at a predetermined maximum value and the amount of air to be blown at a predetermined minimum value. Thus, the temperature in the air conditioned room is adjusted to the predetermined value and the humidity is also kept at the set value or lower. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air conditioner using deep ocean water as a cold heat source.

  Since deep ocean water is at a substantially constant low temperature regardless of changes in surface seawater temperature, various technologies using the cold energy of this deep ocean water have been proposed (see Patent Document 1).

  When using deep ocean water cooling for air conditioning (cooling), supply ocean deep ocean water directly to the air-water heat exchanger of the air conditioner installed in the machine room, and air cooled by the heat exchanger is ducted All-air system for supplying air to air-conditioned rooms through air, and air conditioners that supply deep ocean water to a water-water heat exchanger to cool fresh water and provide cooled fresh water (cold water) in each air-conditioned room There is a water system in which the air in each air-conditioned room is cooled by supplying to the air-water heat exchanger.

  In both the all-air method and the water method described above, the temperature control of the air-conditioned room is the amount of deep ocean water or cold water supplied to the air-water heat exchanger with the air volume in each air conditioner kept constant. It is done by adjusting.

Thus, for example, when the temperature of deep ocean water is high, the temperature of deep ocean water or cold water supplied to the air-water heat exchanger is high, and when the air conditioning sensible heat load is small, air-water heat exchange is performed. Since the amount of deep ocean water or cold water supplied to the vessel is small and the supply air temperature is high, the humidity of the air-conditioned room is 70 to 90% RH, which is higher than the normal 50 to 60% RH.
JP 2000-87579 (pages 1-7 and FIG. 1)

  The object of the present invention is to control the temperature and humidity of an air-conditioned room without providing a dehumidifier or a reheat heater, to achieve energy saving and to perform comfortable air conditioning at a humidity of 60% RH or less. The object is to provide an air conditioner capable of

  In order to achieve the above object, an air conditioner according to claim 1 of the present invention includes an air-water heat exchanger and a blower in an air passage of an air conditioner, and exchanges heat with deep ocean water or ocean deep water. A water feed pipe for supplying cold water cooled by the air-water heat exchanger, a water return pipe for returning the water that has passed through the air-water heat exchanger, and a midway between the water feed pipe and the water return pipe. A communicating bypass pipe, and a control valve mechanism for controlling deep sea water or cold water supplied to the air-water heat exchanger by adjusting an amount of deep sea water or cold water flowing into the bypass pipe from the water feed pipe; And an air volume control mechanism for controlling the air volume of the blower, and further, based on the temperature and humidity detected by a temperature sensor and a humidity sensor provided in the air-conditioned room, the control valve mechanism and the air volume control mechanism Control to control The control circuit is configured to maintain a constant air flow rate when the humidity detected by the humidity sensor is equal to or lower than a preset value, but to supply the air-water heat exchanger to the deep ocean water. Alternatively, a temperature control operation is performed in which the amount of cold water is controlled based on the difference between the temperature detected by the temperature sensor and the set temperature, and the temperature in the air-conditioned room is adjusted to a predetermined value, and the humidity sensor When the humidity detected by the above exceeds a preset value, the control circuit keeps the amount of deep ocean water or cold water supplied to the air-water heat exchanger at a preset maximum value. When the dehumidifying operation for dehumidifying is performed by lowering the air temperature in the air passage while keeping the blast amount at a preset minimum value, and the humidity detected by the humidity sensor is equal to or less than the preset value Again said temperature Control operation is performed, there as being configured to humidity is kept below a predetermined value as the temperature of the air conditioned room is adjusted to a predetermined value.

  The air conditioner according to claim 2 of the present invention includes a timer that turns on the control circuit when the dehumidifying operation time starts and turns off when a preset time elapses, and when the timer is turned off. Control is performed such that the dehumidifying operation is terminated and the temperature control operation is started.

  The air conditioner according to claim 3 of the present invention is characterized in that an air volume control in the blower is controlled by an inverter.

  According to the present invention, it is possible to effectively use the cold heat of deep ocean water, and to reliably perform dehumidification in the air-conditioned room without providing a reheat heater or dehumidifier in the air conditioner. And comfortable air conditioning.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an air conditioner according to the present invention will be described in detail based on specific examples shown in the accompanying drawings.
In the air passage of the air conditioner 2 provided in the air-conditioned room 1, an air filter 3, a blower 4, and a cooling coil 5 serving as an air-water heat exchanger are provided from the air inlet 2a side toward the outlet 2b side. A water feed pipe 7 from a plate heat exchanger 6 which is a water-water heat exchanger is connected to the cold water inlet 5a of the cooling coil 5, and a water return to the plate heat exchanger is connected to the cold water outlet 5a. A tube 8 is connected.

  The plate heat exchanger 6 performs heat exchange between deep sea water and water, and a deep water feed pipe 9 and a return pipe 10 are connected to the primary side of the plate heat exchanger, The water feed pipe 7 and the water return pipe 8 are connected to the secondary side.

  In the middle of the water feed pipe 7 and the water return pipe 8, a bypass pipe 11 that connects the water feed pipe and the water return pipe is connected, and the water feed pipe or the water return pipe of the bypass pipe is connected. The control valve mechanism 12 is provided at a branch portion (a branch portion on the water return pipe 8 side in FIG. 1).

  The control valve mechanism 12 is composed of, for example, a three-way flow control valve, and can control the flow rate between the first inlet port 12a and the outlet port 12c and between the second inlet port 12b and the outlet port 12c. Therefore, the amount of water sent to the cooling coil 5 can be arbitrarily controlled.

  Further, the blower 4 can adjust the amount of air blown by the inverter 13, and can arbitrarily control the amount of air sucked from the air inlet 2a of the air conditioner 2 and sent from the air outlet 2b through the cooling coil. Yes.

  The control valve mechanism 12 and the inverter 13 are connected to the control circuit 16 by signal lines 14 and 15, respectively, and the amount of water supplied to the cooling coil 5 in the control valve mechanism 12 based on the signal from the control circuit. In the inverter 13, the amount of air blown from the blower can be adjusted.

  Further, a temperature sensor 17 and a humidity sensor 18 provided in the air-conditioned room 1 are connected to the control circuit 16, and based on the temperature and humidity in the air-conditioned room detected by the temperature sensor and the humidity sensor. The control valve mechanism 12 and the inverter 13 are controlled.

  Specifically, when the humidity in the air-conditioned room 1 is a predetermined humidity that is set in advance, for example, 60% RH or less, the control circuit sets a predetermined amount of air blown from the blower to the inverter 13. The control valve mechanism 12 is controlled so as to maintain a constant value, and a temperature control operation is performed for adjusting the amount of cold water supplied to the cooling coil 5 based on the temperature detected by the temperature sensor.

  More specifically, when the temperature in the air-conditioned room 1 is somewhat higher than the set temperature, the amount of cold water supplied from the water feed pipe 7 to the cooling coil 5 side in the control valve mechanism 12 is increased, and the flow to the bypass pipe 11 side is increased. When the chilled water feed amount is made small and the temperature of the air-conditioned room is somewhat lower than the set temperature, the chilled water supply amount from the water feed pipe 7 to the cooling coil side in the control valve mechanism 12 is decreased, and to the bypass pipe 11 side. Increase the amount of cold water feed.

  In addition, when the humidity in the air-conditioned room is a predetermined humidity set in advance, for example, less than 60% RH, the control circuit controls the inverter 13 so as to keep the air flow rate of the blower at a preset minimum value. And a dehumidifying operation is performed for the control valve mechanism 12 so as to supply the entire amount of cold water to the cooling coil side.

In this dehumidifying operation, since the blast amount is the minimum value and the chilled water supply amount to the cooling coil is the maximum, the air in the air passage is cooled to a temperature lower than the dew point, dehumidified, and supplied to the air-conditioned room.
The drain condensed on the surface of the cooling coil 5 is discharged outside the air conditioner through a drain pan and a drain pipe (not shown).

  By the way, the control circuit 16 is provided with a timer 16a, which is turned on when the above-described dehumidifying operation is started, and is turned off when a preset time has elapsed, and the dehumidifying operation is stopped by turning this timer off. Thus, the temperature control operation described above is performed from the dehumidification operation.

  More specifically, when the air conditioning sensible heat load of the air in the air-conditioned room is large and the dehumidification operation does not end within a predetermined time, the temperature control in the air-conditioned room can be resumed to give priority to the temperature control. It is like that.

  In the above-described embodiment, cold water is supplied to one air conditioner provided in one air-conditioned room, but in reality, one cold water circulation line is provided for each air conditioner provided in a plurality of air-conditioned rooms. The air conditioners are connected in parallel to supply cold water, and the temperature and humidity of each air-conditioned room are individually controlled. In this case, the temperature sensor 17 and the humidity sensor 18 are provided in each air-conditioned room and controlled. The circuit 16 may also be provided for each air-conditioned unit, or individual control for each air-conditioned room may be centrally controlled by one control circuit.

  In the above-described embodiment, the deep ocean water is exchanged with water and supplied to the cooling coil of the air conditioner. However, the deep ocean water may be supplied directly to the air conditioner, as shown in FIG. In some cases, both cold water and deep ocean water are used.

  Specifically, an air filter 20, a first cooling coil 21, a second cooling coil 22, and a blower 23 are provided in this order from the upstream side in the air flow direction in the air passage of the air conditioner 19. Supplies cold water in the same manner as in the embodiment shown in FIG. 1 and directly supplies deep ocean water to the second cooling coil 22.

  Thus, the cold water supply to the first cooling coil 21 and the air volume control for the blower 23 are performed in the same manner as in the first embodiment, but the deep sea water feed pipe 24 and the return pipe 25 to the second cooling coil 22 are used. In the same manner as in the case of the water feed pipe 7 and the return pipe 8 in the first cooling coil, a bypass pipe 26 and a control valve mechanism 27 are provided, and this control valve mechanism 27 is also the same as that in the first embodiment. Controlled.

  The thing of 2nd Example mentioned above is suitable for the all-air system which supplies cooling air to each air-conditioned room by the duct 28. FIG.

The block diagram which shows the Example of the apparatus which concerns on this invention. The block diagram which shows the other Example of the apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air-conditioned room 2 Air conditioner 3 Air filter 4 Blower 5 Cooling coil 6 Plate heat exchanger 7 Water feed pipe 8 Water return pipe 9 Deep sea water feed pipe 10 Deep sea water return pipe 11 Bypass pipe 12 Control valve mechanism 13 Inverter 14 Signal line 15 Signal line 16 Control circuit 17 Temperature sensor 18 Humidity sensor 19 Air conditioner 20 Air filter 21 First cooling coil 22 Second cooling coil 23 Blower 24 Deep sea water feed pipe 25 Deep sea water return pipe 26 Bypass Pipe 27 Control valve mechanism 28 Duct

Claims (3)

  A water feed pipe provided with an air-water heat exchanger and a blower in an air passage of the air conditioner, and supplying cold water cooled by heat exchange with deep sea water or deep sea water to the air-water heat exchanger; A water return pipe that returns the water that has passed through the air-water heat exchanger, a bypass pipe that communicates between the water feed pipe and the water return pipe, and deep sea water flowing into the bypass pipe from the water feed pipe or A control valve mechanism for controlling deep sea water or cold water supplied to the air-water heat exchanger by adjusting the amount of cold water, and further comprising an air volume control mechanism for controlling the air volume of the blower, A control circuit is provided for controlling the control valve mechanism and the air volume control mechanism based on temperature and humidity detected by a temperature sensor and a humidity sensor provided in the air-conditioned room, and the control circuit is detected by the humidity sensor. Wet Is equal to or less than a preset value, the air flow rate is kept constant, but the amount of deep ocean water or cold water supplied to the air-water heat exchanger is determined by the temperature detected by the temperature sensor and the set temperature. When the temperature control operation in which the temperature in the air-conditioned room is adjusted to a predetermined value is controlled based on the difference between the two, and the humidity detected by the humidity sensor exceeds a preset value, The control circuit keeps the amount of deep ocean water or cold water supplied to the air-water heat exchanger at a preset maximum value, but keeps the air flow rate at a preset minimum value in the air passage. A dehumidifying operation is performed to dehumidify by lowering the air temperature. When the humidity detected by the humidity sensor falls below the preset value, the temperature control operation is performed again, and the temperature in the air-conditioned room is set to a predetermined value. When adjusted to the value Constructed air conditioner according to deep sea water comprising as humidity is maintained below a predetermined value to.   The control circuit includes a timer that is turned on when the dehumidifying operation time is started and turned off when a preset time elapses. When the timer is turned off, the dehumidifying operation is terminated and the temperature control operation is started. The air-conditioning apparatus using deep ocean water according to claim 1, wherein the control is performed as described above.   The air-conditioning apparatus using deep ocean water according to claim 1, wherein an air volume in the blower is controlled by an inverter.

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