JPH0452592Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an air conditioner that reduces the thermal energy required to condition intake air.

(Prior art) A general air conditioner (hereinafter referred to as an air conditioner) used to control the temperature of air blown into a factory building or into a painting booth.
The air conditioner is capable of heating, humidifying, cooling, and dehumidifying the intake air, or performs multiple air conditioning functions. For example, as shown in FIG. 5, a conventional air conditioner has an air inlet 10a and an air outlet 10b.
An air filter 1 for filtering intake air is attached to an air inlet 10a of a casing 10 having
A drain plate 6 for dehumidification, a heating coil 7 for heating and dehumidification, and a blower 9 are provided. The cooling coil 2 is supplied with cooling water from a cold water pipe 3, and the humidifying means 4 is connected to a water pipe 5 for supplying water to a spray built in the humidifying means 4, which further heats the water. Hot water is supplied to the coil 7 from a hot water pipe 8.

In FIG. 5, the arrows at the left and right ends indicate the direction of air flow, and the arrows of each water tube indicate the direction of fluid flow within the tube.

When heating the intake air, hot water is supplied to the heating coil 7 via the hot water pipe 8, and the air passing through the heating coil 7 is heated by heat exchange action. On the other hand, when cooling is performed, cold water is supplied to the cooling coil 2 via the cold water pipe 3, thereby cooling the same.

Further, when the sucked air is humidified, hot water is supplied to the humidifying means 4 via the water pipe 5. On the other hand, when dehumidifying, cool water is supplied to the cooling coil 2 to cool the blown air to near saturation, and after removing condensed water with the drain plate 6, hot water is supplied to the heating coil 8 to cool the air. Reheat.

(Problems to be solved by the invention) In the air conditioner of the above-mentioned prior art, when it is necessary to heat the blown air, mainly in winter, a heating medium such as hot water is supplied to the heating coil 7. Therefore, all the thermal energy necessary to heat this heating medium and to obtain hot water to be supplied to the humidifying means 4 must be generated for that purpose.

In addition, in order to increase the efficiency of thermal energy exchange when heating the heat medium, etc., the temperature level of the heat medium, etc. is compared to the temperature level of the supply air by several tens of degrees to hundreds of degrees.
The problem is that the temperature is raised to several hundred degrees in some cases, and the efficiency of thermal energy is low, resulting in energy consumption.

The present invention has been made in view of the problems of the prior art described above, and aims to reduce thermal energy without significantly improving the device compared to the conventional device.

(Means for Solving the Problems) To achieve the above object, the present invention is an air conditioner comprising a heating coil, a humidifying means, and a cooling coil in a casing having an air outlet and an air inlet. , a coil hot water supply pipe is connected to a cold water supply pipe that supplies cold water into the cooling coil,
A hot water discharge pipe is connected to a cold water discharge pipe that guides cold water discharged from the cooling coil, and the hot water supply pipe is connected to an outlet of a heat exchange coil heated by a heat generation source. The air conditioner is characterized in that the hot water discharge pipe is connected to the inlet, so that the cooling coil can also be used as an auxiliary heating coil.

(Function) According to the above configuration, when outside air is sucked in from the air inlet of the casing and heated, and then the heated air is supplied from the air outlet to a predetermined part such as inside a factory building, mainly in winter, , for cooling coils mainly used to cool the air in the summer.
Circulate hot water. This hot water is supplied from a heat exchange coil that is heated by a heat generation source installed in the factory, such as an electrodeposition tank of an electrocoating equipment, and is heated by this heat generation source. In this way, the cooling coil is also used as an auxiliary heating coil when heating air, making it possible to reduce the thermal energy required for heating.

(Example) Hereinafter, the present invention will be described in detail based on the illustrated example.

FIG. 1 is a diagram showing an air conditioner according to a first embodiment of the present invention, and parts common to parts in the general air conditioner shown in FIG. 5 are given the same reference numerals.

In the illustrated embodiment, the air conditioner casing 1
An overfilter 1 is provided at the air inlet 10a on the right side of the casing 10, and a cooling 2, a humidifying means 4, a drain plate 6, and a heating coil 7 are arranged in the casing 10 in this order from the upstream side of the air flow. has been done. A blower 9 is installed on the left side of the casing 10 to send conditioned air to a predetermined location from an air outlet 10b. Cooling coil 2 inside casing 10
A bypass air passage 11 is formed between the casing 10 and the ceiling of the casing 10, and a damper 12 for adjusting the volume of air passing through the bypass air passage 11 is provided within this air passage 11. Incidentally, the casing 10 may be formed up to the position shown by the reference numeral 13 in FIG. 1 without forming the bypass air passage 11, but if the damper 12 is closed,
The situation will be similar to this.

The cold water pipe 3 that guides cold water to the cooling coil 2 is a cold water supply pipe 3 that supplies cold water to the cooling coil 2.
a, and a cold water discharge pipe 3b that guides the cold water discharged from the inside of the cold water coil 2, and these pipes 3a, 3
b is connected to a cold water source (not shown). The cold water supply pipe 3a is branched into a hot water supply pipe 20a.
is connected to the cold water discharge pipe 3b, and a hot water discharge pipe 20b is connected to the cold water discharge pipe 3b by branching therefrom. Code A,
Each B indicates a branch point.

The hot water supply pipe 20a is connected to the outlet of the heat exchange coil 15a, and the hot water discharge pipe 20a is connected to the outlet of the heat exchange coil 15a.
b is connected to the inlet of the heat exchange coil 15a. This heat exchange coil 15a utilizes the electrodeposition liquid in the electrodeposition tank 15 of the electrodeposition coating equipment as a heat source.
This allows it to be heated. Since this heat exchange coil 15a is also used to cool the electrodeposition liquid in the electrodeposition tank, the hot water discharge pipe 20
A cooling tower 18 is connected to b, and a pump 19 for supplying water that has passed through the cooling tower 18 to the heat exchange coil 15a is provided in the hot water discharge pipe 20b.

A bypass passage 21 is provided between the hot water supply pipe 20a and the hot water discharge pipe 20b, and a switching valve 14 consisting of a three-way valve or the like is provided at the connection between the bypass passage 21 and the hot water discharge pipe 20b. There is. By operating this switching valve 14, the hot water flowing out from the heat exchange coil 15a is guided to the hot water supply pipe 20a through the bypass path 21 to the hot water discharge pipe 20b, thereby cooling the electrodeposition liquid in the electrodeposition tank 15. You can also do this. By operating the switching valve 14 in the opposite manner to the case described above, it is possible to simultaneously cool the electrodeposition liquid and supply water that has become hot within the heat exchange coil 15a to the cold water coil 2. An on-off valve 22 is provided in each of the cold water supply pipe 3a and the cold water discharge pipe 3b, and an on-off valve 23 is provided in each of the hot water supply pipe 20a and the hot water discharge pipe 20b. Inside the casing 10, the air suction port and the hot water supply pipe 20a each have a blown air temperature and an electrodeposition tank 1.
A temperature sensor 16 is provided to measure the temperature of the cooling water, that is, hot water, after being heated by the controller 5. Signals from the respective sensors 16 are sent to the control means 17, and the signals from the control means 17 control the switching valve 14. The amount of opening is controlled.

Next, a procedure for heating air blown from the air inlet 10a mainly in the winter season using the air conditioner shown in FIG. 1 will be described.

First, the on-off valve 22 of the cold water pipe 3 of the cooling coil 2 is closed, the on-off valves 23 of the hot water supply pipe 20a and the hot water discharge pipe 20b are opened, and furthermore, the damper 12 is closed. The hot water cooled by the cooling tower 18 is sucked by the pump 19 and is transferred to the heat exchange coil 15 in the electrodeposition bath 15 via the hot water discharge pipe 20b.
You will be guided to a. After the water cooled by the cooling tower 18 is heated by the electrodeposition tank 15,
If the water temperature is higher than the intake air temperature, the switching valve 14 is activated by a signal from the control means 17;
The air is guided from the heat exchange coil 15 through the hot water supply pipe 20a to the cooling coil 2, and preheats the air drawn in from the outlet 10a. The hot water cooled by the cooling coil 2 returns to the cooling tower 18 via the hot water discharge pipe 20b. Thereby, the exhaust heat of the electrodeposition tank 15 can be used to preheat the suction air. The preheated air is humidified to a predetermined humidity by a humidifier 4, then heated to a predetermined temperature by a heating coil 7, and then supplied. If the temperature of the suction air is higher than the temperature of the water in the heat exchange coil 15a heated in the electrodeposition tank 15, the switching valve 14 is activated by a signal from the control means 17, and the water is cooled by the bypass path 21. Avoid the coil 2 and return directly to the cooling tower 18. This circuit prevents the intake air from being adversely cooled.

On the other hand, a procedure for cooling and dehumidifying intake air using the air conditioner shown in FIG. 1 will be explained.

The on-off valves 22 of the water pipes 3 of the cooling coil 2 are opened, and the on-off valves 23 of the hot water supply pipe 20a and the hot water discharge pipe 20b are closed. As a result, the air purified by the overfilter 1 is branched by the air volume adjustment damper 12 into air passing through the cooling coil 2 and air passing through the bypass circuit 11, and mixed downstream of the cooling coil 2. Air is supplied by At this time, the heating coil 7 does not need to be operated. Here, the air that has passed through the cooling coil 2 is low temperature and humid air, and compared to this air, the air that has passed through the bypass air path 11 is high temperature and low humidity, so the air after these is mixed is the bypass air The air passing through channel 11 is heated and the relative humidity is reduced.
This allows cooling and dehumidification without operating the heating coil 7.

FIG. 2 is a diagram showing an air conditioner according to a second embodiment of the present invention, in which parts common to those in the previous embodiment are given the same reference numerals.

In the illustrated embodiment, the condenser (condenser) 2
4a and an evaporator 24b, and a condenser 24a is connected between a hot water supply pipe 20a and a hot water discharge pipe 20b. Further, the evaporator 24b has a circulation path 25 connected to a heat exchange coil 15a provided in the electrodeposition tank 15.
connected by. Therefore, the refrigerator 24
As a result, the electrodeposition liquid in the electrodeposition bath 15 is cooled, and hot water heated by a condenser 24a serving as a heat exchange coil flows into the cooling coil 2 to preheat the suction air. Further, the air inlet 19a of the casing 10 is divided into an inside air suction port 28 and an outside air suction port 29, and the outside air suction port 29 opens into the bypass air passage 11. The outside air inlet 29 is provided with an air filter 27, and the damper 12 can adjust the mixing amount of air that passes through the cooling coil 2 and air that does not pass through the cooling coil 2. Further, the damper 26 is designed to be able to adjust the amount of mixture of inside air and outside air before passing through the cooling coil 2. The procedure for cooling the intake air is as follows:
This is the same as the first embodiment. Also, virtual line 13
It is also possible to have a duct shape as shown in .

FIG. 3 is a diagram showing an air conditioner according to a third embodiment of the present invention, in which parts common to those in the previous embodiment are given the same reference numerals.

The illustrated embodiment has a plurality of electrodeposition tanks 15, a cooling tower 18 and a refrigerator 24 for cooling these electrodeposition tanks 15, and also uses the electrodeposition tank 15 as a heat source. The hot water heated here is circulated through the cooling coil 2, and the cold water cooled by the refrigerator 24 can also be supplied to the cooling coil 2.

Therefore, in this case, the upstream side of the cold water supply pipe 3a becomes the hot water supply pipe 20a, and the cold water discharge pipe 3b
The downstream side of is a hot water discharge pipe 20b. A loop-shaped cold water circulation path 26 is connected to the hot water discharge pipe 20b, and a condenser 24a constituting the refrigerator 24 is connected to this cold water circulation path 26.

Two heat exchange coils 1 each provided in an electrodeposition tank 15 and exchanging heat with the electrodeposition liquid therein.
5a are mutually connected in parallel to a loop-shaped water circulation path 27. The hot water supply pipe 20a is connected between the outlet of the heat exchange coil 15a in the water circulation path 27 and the cold water supply pipe 3a.
The heat exchange coil 15 in the water circulation path 27
A cold water pipe 28 is connected between the inlet a and the cold water supply pipe 3a. Code A is this cold water pipe 28
The connection part between and the cold water supply pipe 3a is shown.

A condenser 24a constituting the refrigerator 24 is incorporated in the cold water circulation path 26. A bypass pipe line 29 is connected between an upstream part of the cold water circulation path 26 of the condenser 24a and a downstream part of the evaporator 24b of the water circulation path 27. Reference numeral 30 indicates an on-off valve provided in the cold water circulation path 26, and reference numeral 31 indicates an on-off valve provided in the bypass pipe 29. Furthermore, the cold water pipe 28 is provided with an on-off valve 32, and the hot water supply pipe 28 is provided with two valves.
0a is provided with an on-off valve 33, the water circulation path 27 is provided with an on-off valve 34, and the hot water discharge pipe 20b is provided with an on-off valve 36. Further, a bypass path 37 having an on-off valve 35 is connected between the hot water discharge pipe 20b and the water circulation path 27.

In the embodiment shown in FIG. 3, when the cooling coil 2 is first heated to heat the suction air and the electrodeposition tank 15 is cooled by the refrigerator 24, the on-off valves 30, 3
Open the on-off valves 31, 32, 34, 3.
Close 6. The cold water cooled by the refrigerator 24 is guided through the water circulation path 27 to the heat exchange coil 15a in the electrodeposition tank 15 and heated. Thereafter, the hot water is guided to the cooling coil 2 by the hot water supply pipe 20a and the cold water supply pipe 3a, and preheats the intake air.
The hot water cooled by the cooling coil 2 returns to the cold water circulation path 26 through the cooling water discharge pipe 3b and the hot water discharge pipe 20b. The hot water or cold water guided by the hot water supply pipe 20a is controlled by the control means 17 to which the signal from the hot water sensor 16 is input, as in the previous embodiment.
The switching valve 14 is actuated, and the circuit selects whether the hot water is circulated through the cooling coil 2 from the hot water supply pipe 20a or returned to the refrigerator 24 via the bypass pipes 21 and 37.

Next, when the suction air is heated and the electrodeposition bath 15 is cooled in the cooling tower 18, the on-off valve 31,
33, 36, and open/close valves 30, 32, 34,
35 will be closed. In this case, multiple electrodeposition tanks 15
The circuit is the same as that of the first embodiment except that the two are arranged in parallel, and the cooling procedure is also the same as that of the first embodiment.

As a result, whether the electrodeposition tank is cooled with a refrigerator or a cooling tower, the waste heat generated in the electrodeposition tank can be used as a heat source for the residual heat of the intake air. can do.

On the other hand, when cooling and dehumidifying the intake air, open the on-off valves 30, 32, 34, and 35, and
1, 33, and 36 are closed, a circuit is formed in which the cold water cooled by the refrigerator 24 is guided to the cooling coil 2 and circulated, and the intake air is cooled and dehumidified in the same manner as in the first embodiment. Ru.

FIG. 4 is a diagram showing an air conditioner according to a fourth embodiment of the present invention, in which parts common to those in the previous embodiment are given the same reference numerals.

In the illustrated embodiment, similar to the air conditioner casing shown in FIG. 5, this is an embodiment in which a gap 39 is provided in the cooling coil through which the air drawn into the air conditioner flows in a non-cooled state. If there is a spatial restriction, by implementing this embodiment, the thermal energy during cooling and dehumidification can be reduced without expending effective equipment costs.

Next, with reference to FIGS. 6, 7, 8, and 9, experimental results of the conventional example shown in FIG. 5 and the present invention shown in FIG. 1 will be explained.

FIG. 6A is a schematic diagram showing experimental data during heating of the conventional air conditioner shown in FIG. 5 and a conventional electrodeposition coating equipment (not shown); Heat energy of 1,040,000 Kcal/H is required to heat and humidify 2,540 m ³ /min of intake air with a RH of 50% to 18.0°C and 80%. On the other hand, in the electrodeposition coating equipment shown in Fig. 6B, the thermal energy generated in the electrodeposition tank 15 is 450000 Kcal/H, and when this is cooled with cold water at a water temperature of 14.0°C and a flow rate of 1500/min, the cold water is
The water is heated to 19.0℃.

On the other hand, the experimental results when heating the air conditioner according to the first embodiment of the present invention shown in FIG. 1 are as shown in FIG.

According to this experiment, by supplying cold water heated in the electrodeposition tank 15 at a water temperature of 19.0°C and a flow rate of 1500/min to the cooling coil 2, suction air with an air temperature of 10.0°C and a relative temperature of 50% is 2540 m ³ /min. is preheated to 15.8°C, and in order to heat and humidify the air to 18.0°C by 80%, 805,000 Kcal/H of thermal energy is sufficient, which can reduce the thermal energy of 235,000 Kcal/H.

FIG. 8 is a schematic diagram showing experimental data during cooling of the conventional air conditioner shown in FIG.
To cool m ³ /min to 26.8℃
It takes 1030000Kcal/H of heat energy to further heat it up to reduce the relative humidity to 89%.
It requires 30000Kcal/H of thermal energy. This air is finally heated by the heat generated by the blower to 30.3°C, 82%, consuming a total of 1,330,000 Kcal/H of thermal energy.

On the other hand, the experimental results during cooling of the air conditioner according to the first embodiment of the present invention shown in FIG. 1 are as shown in FIG.

This experiment shows a case in which 8350 m ³ /min of intake air with an air temperature of 33°C and a relative humidity of 70% is divided into halves (4173 m ³ /min) each by the air volume adjustment damper 12, and by the cooling coil 2. The thermal energy required to cool down to 25.7℃ is 800000Kcal/H. Then branched 33℃, 70% air and 25.7℃,
When 100% air is mixed, it becomes 29.4℃ and 83%, and the heat generated by the blower heats it to 30.9℃ and 76%. This eliminates the need for thermal energy to be applied to the heating coil 7, making it possible to cool with 800,000 lcal/H of thermal energy, reducing thermal energy by 530,000 Kcal/H compared to the conventional air conditioner shown in FIG.

(Effects of the invention) As described above, according to the invention, hot water from a heat generation source such as an electrodeposition bath is supplied to the cooling coil of the air conditioner, so that the air drawn in from the air inlet is heated. In this case, the thermal energy generated from a heat generating source such as an electrodeposition tank can be used, and the thermal energy required for air conditioning when heating suction air can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an air conditioner according to one embodiment of the present invention, Figs. 2, 3, and 4 are sectional views showing air conditioners according to other embodiments of the present invention, and Fig. 5 is a sectional view showing an air conditioner according to another embodiment of the present invention. FIGS. 6 and 8 are diagrams showing experimental data of the conventional air conditioner, and FIGS. 7 and 9 are diagrams showing experimental data of the present invention. 1...Air filter, 2...Cooling coil, 3
a...Cold water supply pipe, 3b...Cold water discharge pipe, 4...
Humidifying means, 6...Draining plate, 7...Heating coil, 9
...Blower, 10...Casing of air conditioner, 1
5...Electrodeposition tank, 15a...Heat exchange coil, 16
... Temperature sensor, 17 ... Control means, 18 ...
Cooling tower, 19...Pump, 20a...
Hot water supply pipe, 20b...Hot water discharge pipe.

Claims (1)

[Scope of utility model registration request] In an air conditioner comprising a heating coil, humidifying means, and a cooling coil in a casing having an air outlet and an air inlet, a hot water supply pipe is connected to a cold water supply pipe that supplies cold water into the cooling coil. A hot water discharge pipe is connected to a cold water discharge pipe that guides the cold water discharged from the cooling coil, and the hot water supply pipe is connected to an outlet of a heat exchange coil heated by a heat generation source. An air conditioner characterized in that the hot water discharge pipe is connected to the inlet of the coil so that the cooling coil can also be used as an auxiliary heating coil.