JP3485799B2 - Heat exchange equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to heat exchange between a first gas and a second gas by sprinkling water on the low enthalpy side to promote heat exchange by evaporation of sprinkled water. The present invention relates to a heat exchange device for increasing heat transfer.

More specifically, heat exchange means for exchanging heat between the first gas and the second gas in a non-contact state is provided, and the water supplied from the tank is sprinkled on the first gas for heat exchange by the heat exchange means. The first operation of returning excess water recovered in an unevaporated state in the water spray to the tank, and the water supplied from the tank to the second gas to be heat-exchanged by the heat exchanging means, and the non-evaporated water in the water spray. The present invention relates to a heat exchange device having a configuration capable of performing selectively a second operation for returning surplus water recovered in a state to a tank and providing operation control means for automatically switching between the first operation and the second operation. .

[0003]

2. Description of the Related Art Conventionally, in this type of heat exchange device, although the amount of water stored in the tank is reduced by evaporation of sprinkled water, fresh water is automatically supplied to the tank. Regarding the switching between the first operation and the second operation, which gas is used to spray the water supplied from the tank is simply switched, and regardless of the switching between the first operation and the second operation, the inside of the tank is changed. The above water was used for watering as it was (see, for example, JP-A-61-252488).

[0004]

By the way, in this type of heat exchange device, heat exchange between the first gas and the second gas is performed in a non-contact state, and there is no contamination between the gases due to the contact between the gases. Therefore, for example, it is often used for heat exchange between a gas containing pollutants and a gas requiring cleanliness, such as heat exchange between exhaust gas and supply air for the purpose of heat recovery in a clean room. However, one gas may be contaminated by the contaminant contained in the other gas.

In other words, although there is no direct contact between gases in the conventional device, for example, surplus water recovered by sprinkling the first gas in the first operation comes into contact with the first water by spraying water.
It becomes polluted by the pollutants in the gas, and the surplus water is returned to the tank to contaminate the stored water in the tank, and in this state, the first operation is switched to the second operation. Then, the tank storage water is used for watering the second gas, so that the second gas is contaminated.

In contrast to this situation, the main problem of the present invention is
While adopting a method of returning excess water generated by water sprinkling to the tank and reusing it for water sprinkling, it is possible to reliably prevent contamination between heat exchanged gases.

[0007]

[1] In the invention according to claim 1, operation control means for automatically switching between the first operation and the second operation is provided in the first operation and the second operation. At the time of switching, the water is automatically replaced by replacing all the stored water in the tank with fresh water, and then the operation at the switching destination is started.

According to this structure, for example, the surplus water returned to the tank by the water spray to the first gas in the first operation is contaminated by the pollutants in the first gas, which contaminates the stored water in the tank. Even so, in the next second operation, the tank storage water, which has been completely replaced with fresh water, is sprinkled into the second gas, so that the second gas is caused by the stored water contamination in the previous first operation. Will not be contaminated. Similarly, even if the surplus water returned to the tank by the water spray to the second gas in the second operation is contaminated by the pollutants in the second gas, which causes the stored water in the tank to be contaminated, In the first operation, the tank stored water, which is completely replaced with fresh water, is sprinkled on the first gas, so that the first gas is not contaminated due to the stored water contamination in the second operation. .

Therefore, as compared with the conventional device which prevents the inter-gas contamination by simply exchanging heat between the first gas and the second gas in a non-contact state, the other gas is contaminated by the contaminant contained in one gas. It is more suitable for heat exchange between gas containing pollutants and gas requiring cleanliness, such as heat exchange between supply air and exhaust air for the purpose of heat recovery in a clean room. It becomes a heat exchange device.

By the way, in order to avoid the above-mentioned inter-gas contamination in which water used for water sprinkling serves as a medium, JP-A-63-10 is used.
As can be seen in Japanese Patent No. 8148, a non-circulating water supply form is adopted such as city water is temporarily supplied as water for sprinkling, or a tank for first operation and a tank for second operation are provided. It may be possible to install it separately, but in the case of a non-circulating water supply type, the water consumption becomes large and the cost increases, and if the sprinkling amount is reduced to reduce the water consumption, the efficiency of steam contact decreases. As a result, the improvement of heat exchange efficiency due to water sprinkling is limited to a low level. Moreover, the effect of water sprinkling on heat exchange changes due to transient fluctuations in the temperature of the supplied water, and heat exchange becomes unstable. Problems such as occur. On the other hand, in the case of providing separate tanks, there are problems that the equipment becomes large due to the equipment of these tanks, the equipment cost increases, and the maintenance becomes complicated.

On the other hand, according to the first aspect of the present invention, basically, a form is adopted in which surplus water for watering is returned to the tank and reused for watering. Even if it is discarded, compared to the non-circulating water supply system as described above, it is possible to reduce the water consumption while making the amount of water sprinkled sufficiently to effectively improve the heat exchange efficiency by water sprinkling. Further, the temperature of water to be sprayed is stabilized at a constant equilibrium temperature by repeated contact with steam, so that stable heat exchange can be maintained. Further, since the tank is shared between the first operation and the second operation, the device can be downsized and the cost of the device can be reduced as compared with the case where separate tanks are provided, and maintenance is also easy. .

In order to prevent only the second gas from being contaminated by the pollutants contained in the first gas, the water renewal is performed only when the first operation is switched to the second operation. In carrying out the invention according to claim 1, water is always updated at the time of switching from the first operation to the second operation and at the time of switching from the second operation to the first operation. No need.

[2] In the invention according to claim 2, in the operation control means, the detected water quality of the tank stored water is set lower limit water quality at every set time during the execution of the first operation or the execution of the second operation. Every time it drops to 0%, all or part of the stored water in the tank will be replaced with fresh water.

According to this structure, during the first operation or the second operation, the surplus water returned to the tank is contaminated by the pollutants contained in the gas to be sprinkled, so that the pollutants are reused when the water is reused. Even if water is gradually accumulated and pollution of the tank storage water progresses, the tank storage water will not be polluted by the above-mentioned water renewal every set time or whenever the detected water quality of the tank storage water decreases to the set lower limit water quality. It can be stopped by a certain limit.

Therefore, since the tank storage water becomes severely contaminated and the tank components themselves are contaminated, even if the water is renewed at the time of switching between the first operation and the second operation, the water is newly renewed by the water renewal. It is possible to prevent the fresh water supplied to the tank from being contaminated by the contaminants remaining in the tank, and from this point, it is possible to more reliably prevent the inter-gas contamination.

Further, since the deterioration of the water quality of the tank storage water due to the pollutants can be stopped to a certain limit, it is possible to prevent inconveniences such as poor water sprinkling and poor heat exchange due to the deterioration of the water quality.
This is particularly effective when the target gas is a gas containing a large amount of pollutants.

[3] In the invention according to claim 3, the operation control means is configured to supply fresh water to the tank after draining all the stored water in the tank when updating the water.

According to this structure, when renewing water, the contaminated reservoir water is completely drained and fresh water is supplied to the tank. It is possible to prevent contamination by mixing.

Therefore, if this water renewal mode is applied to the water renewal at the time of switching between the first operation and the second operation, it is possible to sprinkle water with a less risk of pollution in the operation after the switching, and thereby, Contamination can be prevented more reliably. Further, if this water renewal mode is applied to water renewal during the first operation and the second operation, it is possible to more reliably prevent the contamination of the tank storage water beyond a certain limit, and to more reliably contaminate the tank components themselves. In this respect, inter-gas contamination can be prevented more reliably, and inconveniences such as poor water sprinkling and poor heat exchange due to deterioration of water quality can be more reliably prevented.

[4] In the invention according to claim 4, the operation control means is configured to automatically perform tank cleaning when the water is renewed.

According to this structure, at the time of water renewal, the pollutants cannot be completely removed only by discharging the water stored in the tank, and even if the pollutants remain in the tank due to adhesion to the tank, etc. The remaining contaminants can be eliminated by cleaning the tank of (1), and the contamination due to the residual contaminants of fresh water to be newly supplied can be prevented, and thereby the inter-gas contamination can be prevented more reliably.

[5] In the invention according to claim 5, the operation control means is configured to repeat the water renewal operation for replacing all the stored water in the tank with fresh water a plurality of times as the tank cleaning.

According to this structure, the tank cleaning is performed only by repeating the drainage of the tank storage water and the supply of the fresh water. Therefore, the tank cleaning can be performed only by the dedicated draining means and the fresh water supplying means. Compared to the case where the cleaning means is provided, the device configuration can be simplified, the device can be easily manufactured, and the device cost can be reduced.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows that exhaust heat EA from a clean room guided by an exhaust duct 1 and external air OA introduced into a clean room guided by an outside air duct 2 are heat-exchanged with each other to recover heat retained in the exhaust EA. A heat exchange device for recovering cold heat during cooling and recovering warm heat during heating is shown.

Reference numeral 3 denotes a fin-tube type exhaust side heat exchanger for exchanging heat between the exhaust air EA and the heat medium R, and 4 denotes outside air OA and the heat medium R.
Fin tube type outside air side heat exchanger for heat exchange
Is a heat medium circulation path for circulating the heat medium R by the circulation pump 6 across both heat exchangers 3, 4, and this heat medium circulation path 5
The heat exchange between the exhaust air EA and the outside air OA via the circulating heat medium R is performed in a non-contact state (so-called run-around type).

Reference numeral 7 denotes an exhaust side water sprinkler which sprinkles water on the exhaust EA in a form of precipitation on the exhaust side heat exchanger 3, and 8 denotes an outside air side heat exchanger 4.
Outside-side water sprinkler that sprinkles outside air OA in the form of precipitation on the outside, 9
Is a tank for supplying water W for watering to the water sprinklers 7, 8 through water supply channels 11, 12 by a watering pump 10, and 13 is a tank 9 for storing excess water W'which is recovered in a non-evaporated state during watering for exhaust EA. The exhaust-side return water passage 14 returns to the tank 9. The exhaust-side return water passage 14 returns to the tank 9 the excess water W ′ that has been recovered in an unevaporated state in the sprinkling of the outside air OA.

V1 is an exhaust side sprinkling valve that starts and stops sprinkling of water for the exhaust air EA by opening and closing the exhaust side water supply channel 11, and V2 is an outside air sprinkling valve that starts and stops sprinkling of water for the outside air OA by opening and closing the outside air supply channel 12. , V3 is a drain valve for draining the stored water W in the tank 9, V4 is a ball tap valve for automatically replenishing the tank 9 with fresh water Wi from the replenishing water channel 15 in response to the decrease in the water level of the tank reservoir water, and V5 is the replenishing water channel 15. This is the main valve for the makeup water channel that opens and closes.

Reference numeral 16 is an operation controller (operation control means), and this operation controller 16 is the exhaust gas EA as the first gas.
And the surplus water W'in the sprinkling is returned to the tank 9, whereas the first operation in which the sprinkling to the outside air OA as the second gas is stopped, and conversely to the outside air OA as the second gas. Then, the surplus water W ′ in the sprinkling is returned to the tank 9, while the second operation in which the sprinkling of the exhaust gas EA as the first gas is stopped is referred to as the enthalpy ho of the outside air OA detected by the outside air sensor 17. It switches automatically based on

More specifically, the enthalpy ho of the outside air OA is calculated from the enthalpy he of the exhaust EA (in this example, the enthalpy he of the exhaust EA is treated as a known constant value because the temperature and humidity of the clean room are kept constant by air conditioning). 2 is high (ho> he), as shown in (a) of FIG. 2, the circulation pump 6 ... ON, the sprinkling pump 10 ... ON, the exhaust side sprinkling valve V1 ... open, the outside air side sprinkling valve V2 ... Closed, drain valve V3 ... Closed, make-up waterway main valve V5 ... Opened, and the first operation is performed in which only water is sprinkled on the exhaust air EA. The heat exchange between the exhaust air EA and the outside air OA (in other words, the recovery of cold heat from the exhaust air EA to the outside air OA) is promoted by taking the vaporization heat in.

The enthalpy ho of the outside air OA is exhausted E
It is lower than enthalpy he of A, and the difference is set value Δh.
2 (hz <ho <he-Δh),
As shown in (b), the circulation pump 6 ...... ON, the water sprinkling pump 10 ...... ON, the exhaust side water sprinkling valve V1 ...... closed, the outside air side water sprinkling valve V2 ...... open, the drainage valve V3 ...... closed, the makeup water channel main The valve V5 is opened and the second operation is performed in which only water is sprinkled on the outside air OA. As a result, the heat of vaporization on the outside air side due to the evaporation of the sprinkled water W causes the exhaust air EA and the outside air OA to be absorbed. Heat exchange (in other words, heat recovery from the exhaust air EA to the outside air OA) is promoted.

The operation controller 16 determines that the difference between the enthalpy ho of the outside air OA and the enthalpy ho of the exhaust air EA is lower than the set value Δh (he-
When Δh ≦ ho <he), as shown in (a) of FIG. 3, the circulation pump 6 ... OFF, the water spray pump 10 ... OFF, the exhaust side water spray valve V1 ... Closed, the outside air side water spray valve V2 ... Closed. , Drainage valve V3 ... closed, makeup waterway main valve V5 ... open, and heat exchange operation is stopped.

When the enthalpy ho of the outside air OA is lower than the set lower limit value hz (ho <hz <he-Δh), the circulation pump 6 ... ON, the sprinkling pump 10 as shown in (b) of FIG. ...... OFF, exhaust side sprinkling valve V1 ...... closed, outside air side sprinkling valve V2 ...... closed, drain valve V3 ...... closed, make-up waterway main valve V5 ...... opened, and heat medium R without sprinkling Perform heat exchange operation only by circulation.

That is, even when the enthalpy ho of the outside air OA is lower than the enthalpy he of the exhaust gas EA, when the difference between them is small (he-Δh≤ho <he), the heat recovery is seen from the energy consumed in the operation of the apparatus. Since the energy saving effect due to is not obtained so much, both the heat medium circulation and the water sprinkling are stopped to stop the heat exchange operation, and when the enthalpy ho of the outside air OA is considerably low (ho <hz), the sprinkled water W There is a risk of freezing
The heat exchange operation is performed only by circulating the heat medium without sprinkling water.

When the operation controller 16 automatically switches the operation according to the enthalpy ho of the outside air OA as described above, when the operation is switched from the first operation to the second operation (stopping the heat exchange operation or sprinkling water). (Including the case where the heat exchange operation is performed only with the heat medium circulation that does not accompany), when performing the second operation of the switching destination, a configuration in which the water is automatically replaced by replacing all the stored water W in the tank 9 with fresh water Wi I am doing it.

To be more specific, in carrying out the second operation of the switching destination, first, as shown in FIG. 4 (a), the sprinkling pump 10 ... OFF, the exhaust side sprinkling valve V1 ... Open, the outside air side sprinkling valve. V2 ...... Open, drain valve V3 ...... Open, make-up waterway main valve V5 ...... Closed, draining all the stored water W in the tank 9 together with the water W in the pipe. As shown in (b), the sprinkler pump 10 is turned off, the exhaust side sprinkler valve V1 is opened, the outside air side sprinkler valve V2 is opened, the drain valve V3 is closed, and the makeup waterway main valve V5 is opened. Then, a fresh water Wi is supplied to the tank 9 by automatic replenishment by the ball tap valve V4 to perform a water renewal operation for replacing all the stored water W in the tank 9 with the fresh water Wi,
Then, the water renewal operation is automatically repeated twice, and then the second operation after the switching is performed.

Further, the operation controller 16 is configured to automatically execute the above-mentioned water renewal operation only once every set time during the execution of the first operation.

In other words, even if the surplus water W'returned to the tank 9 by the water spray to the exhaust EA in the first operation is contaminated by the pollutants in the exhaust EA, and the stored water W in the tank 9 is contaminated as a result. By automatically performing the above-described water renewal at the time of switching the operation, in the next second operation, the tank stored water W, which is entirely replaced with the fresh water Wi, is sprinkled to the outside air OA. This prevents the outside air OA introduced into the clean room from being contaminated due to the contamination of the stored water in the first operation.

Further, during the first operation, the surplus water W'returned to the tank 9 is contaminated by the pollutants contained in the exhaust gas EA, so that the pollutants are gradually accumulated as the water is reused and the tank storage water is stored. Even if the W is contaminated, the tank reserving water W is contaminated to a certain limit by renewing the water every set time as described above, whereby the tank reserving water W becomes more contaminated and the tank configuration is increased. Since the material itself is contaminated, even if water is renewed at the time of switching between the first operation and the second operation, fresh water Wi newly supplied by the water renewal is contaminated by contaminants remaining in the tank. In addition to preventing such problems, it also prevents inconveniences such as poor water sprinkling and poor heat exchange due to poor water quality.

[Other Embodiments] The heat exchange means for exchanging heat between the first gas and the second gas in a non-contact state is the exhaust side heat exchanger 3 / outside air side heat exchanger as shown in the above embodiment. 4.
The heat medium circulation path 5 is not limited to the run-around type, but both types of gas can be exchanged in a non-contact state via a heat pipe, or both types of gas can be exchanged via a partition plate forming a heat transfer surface. It may be in a form of heat exchange in a non-contact state.

In the above embodiment, the water is renewed only when switching from the first operation to the second operation, but the second gas is contaminated by the contaminants contained in the first gas, and When it is necessary to prevent both the first gas from being contaminated by the contaminants contained in the second gas, such as when switching from the first operation to the second operation, and
Water renewal may be performed at each of the switching from the operation to the first operation.

In the above embodiment, the water is renewed every set time only during the first operation, but in some cases, the water is renewed every set time in each of the first operation and the second operation. It may be performed.

Further, instead of performing the water renewal during the operation every set time, the water renewal may be carried out every time the water quality of the tank stored water decreases to the set lower limit water quality based on the water quality detection of the tank stored water. In addition, in the water renewal at the time of operation switching, all the stored water in the tank is replaced, whereas in the water renewal during operation every set time or whenever the water quality of the tank stored water drops to the set lower limit water quality, You may replace only a part of water.

The first gas and the second gas, which are the objects of heat exchange, are not limited to the combination of exhaust air and the outside air, and may be any gas for heat exchange for any purpose.

[Brief description of drawings]

FIG. 1 is a diagram showing a device configuration.

FIG. 2 is a diagram showing operation modes of a first operation and a second operation.

FIG. 3 is a diagram showing another operation mode.

FIG. 4 is a diagram showing an operation form of a water update operation.

[Explanation of symbols]

3,4,5 Heat exchange means 9 tanks 16 Operation control means EA first gas OA second gas W water W'excess water Wi fresh water

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Wang Kashiwamori 2-6-1, Nishishinjuku, Shinjuku-ku, Tokyo Incorporated company Oki (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 3 / 147

Claims (5)

(57) [Claims] 1. A heat exchanging means for exchanging heat between a first gas and a second gas in a non-contact state is provided, and water supplied from a tank is sprinkled on the first gas for exchanging heat with the heat exchanging means. A first operation of returning excess water recovered in an un-evaporated state in the water spray to the tank, and water supplied from the tank to the second gas to be heat-exchanged by the heat exchange means, and the water spray In the second embodiment, the operation control means for automatically switching between the first operation and the second operation is configured so that the excess water recovered in the non-evaporated state is returned to the tank and the second operation is selectively performed. A heat exchange device to be provided, wherein the operation control means automatically performs water renewal for replacing all the stored water in the tank with fresh water at the time of switching between the first operation and the second operation, and then switches. Driving ahead Heat exchanger that is in the configuration to start. 2. The operation control means, during the execution of the first operation or the execution of the second operation, each time a set time, or each time the detected water quality of the tank stored water falls to a set lower limit water quality, 2. The heat exchange device according to claim 1, wherein all the stored water in the tank or a part of the stored water is automatically replaced with fresh water. 3. The operation control means, when the water is renewed, after draining all the stored water in the tank,
The fresh water is supplied to the tank.
Alternatively, the heat exchange device according to item 2. 4. The heat exchange device according to claim 1, wherein the operation control means is configured to automatically perform tank cleaning when the water is renewed. 5. The heat exchange device according to claim 4, wherein the operation control means is configured to repeat a water renewal operation for replacing all the stored water in the tank with fresh water as the tank cleaning, a plurality of times.