KR20130047567A - Heat exchanger unit having waste heat withdrawal apparatus - Google Patents

Abstract

PURPOSE: A heat exchange unit with a waste heat recovery device is provided to reduce energy consumption required to supply the high-temperature and large quantity of air to a drier and to improve dry efficiency. CONSTITUTION: A heat exchange unit comprises a fan blower(14), a discharge duct(18), a compressor(50), a heat source-generation heat exchanger(17), a refrigerant expansion device(60), and a waste heat recovery heat exchanger(41). The fan blower supplies filtered air into the heat exchange unit. The discharge duct supplies the air entered from the outside by the fan blower to a drier(30). The compressor compresses a low-temperature and low-pressure refrigerant to a high-temperature and high-pressure refrigerant. The waste heat recovery heat exchanger is formed in an exhaust duct(40) and heat-exchanges between the refrigerant transferred from the refrigerant expansion device and high-temperature waste heat discharged from the exhaust duct.

Description

Heat exchange unit with waste heat recovery unit {HEAT EXCHANGER UNIT HAVING WASTE HEAT WITHDRAWAL APPARATUS}

The present invention relates to an integrated heat exchange unit having a waste heat recovery device, and more particularly, to recovering high-temperature waste heat discharged during ventilation drying in a dryer and reusing it as a heat source for heating air supplied to the dryer. Relates to a heat exchange unit.

Dryer is an air supply / exhaust circulation device that supplies heat to a device that needs to be dried, such as a gravure printing machine, laminating machine, extrusion machine, industrial coating machine, etc. An exhaust part for discharging hot air and a hot air recovery part for reusing part of the used heat.

One side of such a dryer is provided with an integrated heat exchange unit. An integrated heat exchange unit is an equipment for supplying a high temperature and a large amount of air to a dryer. The integrated heat exchange unit is an equipment that combines independent equipment parts into one body so that installation is easy and volume is minimized.

Since the integrated heat exchange unit is designed as an integrated unit from the initial design, the duct facilities are designed together with consideration of the flow of air so that air movement of each component can be smoothly performed. In addition, the number and shape of components to be combined may be changed according to the purpose and type of use, and such an integrated heat exchange unit is largely divided into two types according to the installation position of the heat exchanger. That is, the integrated heat exchange unit may be classified into a horizontal type in which the heat exchanger is positioned at the inlet of the fan blower, and a vertical type in which the heat exchanger is positioned in the discharge duct of the fan blower.

Such a heat exchanger is a device that converts a large amount of low temperature air supplied from a fan blower into high temperature air, and is divided into a steam heater type, a heat medium type heater, and an electric heater type according to the type of the primary heat source.

The steam heater type heat exchanger exchanges heat by passing steam into the heat exchanger, and requires a steam boiler generating steam and an auxiliary facility of a boiler room for driving the boiler. In addition, a steam transfer and recovery pipe is installed to the heat exchanger, and a control valve device is connected to the inlet side of the heat exchanger to maintain a constant heat energy, and a trap (TRAP) is provided at the discharge port to reduce the loss of steam. In this steam heater type heat exchanger, in addition to the energy source used in the steam transportation process, energy loss occurs due to the exposure of pipes and components, and when heat energy is consumed, water (condensed water) is discharged due to the nature of steam that turns into water. A giving device is needed. In addition, a separate boiler room area is required for boiler installation, and it is necessary to prepare for damage of equipment parts due to freezing and freezing in winter. Fuel mainly used for such a steam heater type heat exchanger may include light oil, boiler kerosene, LPG, LNG and the like.

On the other hand, the heat medium heater type heat exchanger circulates the heated heat medium oil inside the heat exchanger to exchange heat, and in most cases, a flow control valve is attached to maintain the temperature. Like steam boilers, the boiler room and the auxiliary facilities of the boiler room are required. The boiler used in the heat medium heater type heat exchanger has a larger installation area in the boiler room than the steam boiler, and requires more than twice as much equipment and equipment cost as the steam heater type. As with steam boilers, there are energy losses from pipe exposure. Fuels mainly used in the heat medium heater type heat exchanger of this type include light oil, boiler kerosene, LPG, LNG, and the like, and electric heaters may be used when the heat consumption is low.

Meanwhile, a heater mainly used in an electric heater type heat exchanger is an electric fan heater. In order to increase heat dissipation efficiency during air circulation, it is manufactured by attaching a heat radiating fin to a pipe heater. By using an electric heater, which is one of the clean fuels, there is no problem of environmental pollution during operation of the equipment. However, the calorific value per ((860 kcal / h per ㎾) is limited, so the more heat required, the larger the capacity should be.

It is an object of the present invention to provide an integrated heat exchange unit having a waste heat recovery unit, which can recover high temperature waste heat discharged during ventilation drying in a dryer and reuse it as a heat source for heating air supplied to the dryer.

The present invention provides an integrated heat exchange unit (10) for supplying hot air into a dryer (30), comprising: a fan blower (14) for supplying external air into the integrated heat exchange unit (10); A discharge duct (18) connected to the dryer (30) to supply air introduced from the outside by the fan blower (14) to the dryer (30); A compressor (50) formed at one side of the discharge duct (18) to compress the low temperature low pressure refrigerant into a high temperature high pressure refrigerant; Is formed on one side of the discharge duct 18, the heat source for generating a first heat exchange between the refrigerant delivered from the compressor 50 and the air supplied to the dryer 30 through the discharge duct 18 Heat exchanger 17; A refrigerant expansion device (60) for converting the condensed high temperature refrigerant into a low temperature low pressure refrigerant by performing the first heat exchange; And a refrigerant formed in the exhaust duct 40 in communication with the exhaust unit 32 for exhausting the waste heat in the dryer 30 to the outside, and the refrigerant transferred from the refrigerant expansion device 60 and the exhaust duct 40. It provides an integrated heat exchanger unit having a waste heat recovery device, comprising: a waste heat recovery heat exchanger (41) in which a second heat exchange is performed between discharged high temperature waste heat.

In the present invention, the refrigerant may include water.

In the present invention, the refrigerant may circulate in the compressor 50, the heat source heat exchanger 17, the refrigerant expansion device 60 and the waste heat recovery heat exchanger 41 in order.

In the present invention, the exhaust duct 40 may be formed directly on the discharge duct 18.

In the present invention, the refrigerant expansion device 60 is an expansion valve 61 for expanding the high-temperature refrigerant transferred from the heat exchanger for heat generation (17) to a low-pressure refrigerant, and the expansion valve 61 A distributor 63 may collect a low pressure refrigerant expanded at and distribute the refrigerant to a plurality of capillary tubes 62 which are supplied to the waste heat recovery heat exchanger 41.

In the present invention, heat may be transferred from the refrigerant delivered from the compressor 50 to air supplied to the dryer 30 through the discharge duct 18.

In the present invention, the second heat exchange may be heat is transferred to the refrigerant delivered from the refrigerant expansion device 60 in the high temperature waste heat discharged through the exhaust duct 40.

According to the present invention, it is possible to obtain the effect of reducing the energy consumption for supplying a large amount of air to the dryer and improving the drying efficiency.

1 is a cross-sectional view showing a state in which an integrated heat exchange unit and a dryer are equipped with a waste heat recovery device of the present invention.
FIG. 2 is a cross-sectional view illustrating an integrated heat exchange unit provided with the waste heat recovery unit of FIG. 1.
3 is a side cross-sectional view of Fig.
4 is a view briefly showing a refrigeration cycle of an integrated heat exchange unit equipped with the waste heat recovery device of FIG. 1.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

1 is a cross-sectional view showing a state in which an integrated heat exchange unit and a dryer are equipped with a waste heat recovery unit of the present invention, FIG. 2 is a cross-sectional view showing an integrated heat exchange unit provided with a waste heat recovery unit of FIG. 1, and FIG. Is a side cross-sectional view of.

Dryer (30) is a supply / exhaust circulation device for supplying heat to a device requiring drying. The dryer 30 is composed of an air supply unit 31 for supplying hot air, an exhaust unit 32 for discharging the used hot air, and a hot air recovery unit for reusing part of the used heat. Predetermined drying is performed therein.

On the other hand, the integrated heat exchange unit 10 is disposed on one side of the dryer (Dryer 30), to supply a high temperature, a large amount of air to the dryer (30). 1 to 3 shows an integrated heat exchange unit 10 of the vertical type in which the heat source heat exchanger 17 is located on the discharge duct 18 side of the fan blower 14. have.

Here, the integrated heat exchange unit 10 according to an embodiment of the present invention recovers heat from the hot air discharged from the dryer 30 to supply heat to the cold air supplied to the dryer 30 to improve energy efficiency. It is characterized by maximizing, which will be described below in detail.

The product dried in the dryer by the hot air supplied from the integrated heat exchange unit is printed, adhered to, adhered to, adhered to, films made of petrochemicals (PET, OPP, NYLON, CPP, LLDED, deposition film, etc.), paper, aluminum foil, etc. Coated products. At this time, the ink, adhesive, coating liquid, etc. to be used are largely classified into oil-soluble adhesives, pressure-sensitive adhesives, adhesives, inks and coating liquids diluted with organic solvents, and water-soluble adhesives, inks and coating liquids diluted with water.

In this case, both oil-soluble and water-soluble streams require fast drying (property drying) to increase productivity.In order to increase the fast drying, the product should be dried by increasing the amount of wind to a certain temperature as much as possible, and the ventilation must be well-ventilated in the dryer. do. In addition, oil-soluble products should not mix evaporated residual solvents with the product.

In order to increase the quick-drying and smooth ventilation drying conditions, it is necessary to generate a large amount of air in a short time and heat it, and to force it to the long sealed box space as much as possible. To do this, the wind speed on the surface of the product should be lowered below a certain speed.

To this end, the dryer is supplied with hot air from an integrated heat exchange unit that produces a large amount of high-temperature air in a short time to filter the dust. In this way, the hot air is moved from the integrated heat exchange unit through the air supply duct into the sealed dry box inside the dryer, and the air moved at a high wind speed inside the dry box is dispersed to various places. To dry. In this drying process, components such as ink, adhesive, coating liquid, etc. are converted into gaseous solvent and moisture, which are discharged to the outside of the dryer through an exhaust port inside the dry box together with a large amount of high temperature air which has been dried. do.

At this time, since the high temperature and a large amount of air discharged through the exhaust port contains a solvent and water, when reusing it, forced dry air condition is not achieved, so quick drying is significantly reduced. In addition, although the heat source under the dry box, which is relatively less contaminated, is partially reused, the risk of contamination cannot be excluded even in this case. The amount of air used in such dryers is generally 40㎥ / min ~ 60㎥ / min, and the temperature is mostly 50 ℃ ~ 80 ℃ (about 80%). have.

On the other hand, the energy consumption of the dryer is mostly generated in the integral heat exchange unit, the energy consumption includes the motor drive energy of the fan blower, the heat source generated energy of the heat exchanger and the like. At this time, the consumption in the heat exchanger is more than 90% of the total energy consumption.

Due to the drying characteristics of the dryer, the heat energy of the heat exchanger is discarded to the outside of the dryer after drying. The energy consumed for drying during the ventilation drying process is only 15% to 20%, and the remaining energy is only 80% to 85%. Thermal energy is being thrown away. In particular, when using a flammable fuel as an energy source, there is a problem that environmental pollution occurs due to the generation of exhaust gas.

In addition, since the exhaust duct of the dryer is generally installed in the workplace, the exhaust gas containing 80% to 85% or more of thermal energy is discharged into the workplace through the exhaust duct, so that the temperature in the workplace rises and the working environment is poor. In particular, there is a problem in that the maintenance cost of the facility is excessively consumed since the air conditioning system must be operated to cool it during the hot summer season.

As such, there have been attempts to reuse more than 80% to 85% of the thermal energy discarded during the ventilation drying process, but the direct reuse of the heat source discarded in the dryer does not satisfy the ventilation drying conditions, but also deteriorates the product quality. Providing the cause of the defect and lowering the productivity can be brought. Therefore, in order to effectively utilize the waste heat discarded, only the pure heat source of the exhaust heat source discharged should be recovered and used.

To this end, the integrated heat exchange unit 10 according to an embodiment of the present invention recovers heat from the high-temperature air discharged from the dryer 30 to supply heat to the low-temperature air supplied to the dryer 30 for energy efficiency. It is characterized by maximizing. In addition, it is characterized by using a liquid such as water as a refrigerant for driving the integrated heat exchange unit 10. This will be described in more detail as follows.

Referring back to FIGS. 1 to 3, the integrated heat exchange unit 10 includes a first filter box (not shown) in which an inlet 11, a suction chamber 12, and a HEPA filter are inserted. , Fan blower 14, drive device 15, duct 16, heat source heat exchanger (condenser 17), second filter box (not shown) and discharge duct 18.

The inlet 11 is formed at one side of the lower end of the integrated heat exchange unit 10, and air is introduced from the outside through the inlet 11. The suction chamber 12 changes the temperature by mixing the air sucked through the suction port 11. The first filter box (not shown) is disposed on one side of the suction chamber 12, and asbestos, which is a known special electrified fiber, which filters even minute harmful substances and contaminated dust contained in the air in the suction chamber 12 therein. High Efficiency Particulate Air (HEPA), a filter paper made of fibers, is accommodated.

The fan blower 14 flows outside air into the integrated heat exchange unit 10 through the inlet 11, passes through the HEPA filter 13 in the filter box 20, and flows out to the discharge duct 18. Blow as much as possible. In addition, the driving device 15 disposed at one side of the fan blower 14 provides a predetermined driving force for driving the fan blower 14.

The heat source heat exchanger 17 performs a heat conversion (heating) of low temperature air flowing toward the discharge duct 18 by the fan blower 14 to high temperature air. On the other hand, the second filter box (not shown) is installed on one side of the heat source generating heat exchanger 17, the air converted to high temperature through the heat source generating heat exchanger 17 is filtered again to be clean air. The HEPA filter is inserted.

The discharge duct 18 is formed at one side of the heat source generator heat exchanger 17 and the second filter box (not shown), and is connected to the dryer 30 to supply a large amount of high temperature air to the dryer 30. Play a role. By supplying hot air into the dryer 30 through the discharge duct 18, printing, bonding, etc. to films (PET, OPP, NYLON, CPP, LLDED, deposition film, etc.), paper, aluminum foil made of petrochemicals It will be adhesive and coated.

On the other hand, the wind pressure switch 70 detects the flow of air passing through each outlet of the discharge duct 18 and the exhaust duct 40 to be described later.

Meanwhile, an air supply unit 31 and an exhaust unit 32 are formed inside the dryer 30. That is, the air moved from the integrated heat exchange unit 10 to the sealed dry box inside the dryer 30 via the air supply unit 31 moves at a high wind speed inside the dry box. It is dispersed in several places to dry the product. At this time, when the product is dried, a part of the printing material, the adhesive material, the adhesive material, the coating material and the like are converted into a gaseous solvent or moisture, and such a gaseous solvent and moisture are exhaust parts 32 inside the dry box. Discharge to the outside of the dryer (30), at this time, a large amount of high temperature air is also discharged together.

At this time, the exhaust duct 40 is disposed above the discharge duct 18 of the integrated heat exchange unit 10 so as to communicate with the exhaust 32 to discharge a large amount of air to the outside of the dryer (30). In the exhaust duct 40, a waste heat recovery heat exchanger 41 for recovering heat from a large amount of high temperature air discharged through the exhaust unit 32 of the dryer 30 is provided. The accommodating heat exchanger 41 is in communication with a heat source generating heat exchanger 17 provided in the discharge duct 18.

The heat source heat exchanger 17 includes a refrigerant suction pipe 17a and a refrigerant discharge pipe 17b. The refrigerant suction pipe 17a sucks the refrigerant discharged from the compressor 50. Here, the compressor 50 is installed in the upper portion of the suction chamber 12, compresses the low-temperature low-pressure gas refrigerant discharged from the waste heat recovery heat exchanger 41 into a high-temperature high-pressure refrigerant heat exchanger for heat generation Discharge to the unit 17.

The refrigerant that provides heat to the air supplied from the heat source heat exchanger 17 to the dryer 30 passes through the refrigerant discharge tube 17b and passes through the capillary tube 62 of the refrigerant expansion device 60. It is converted into a gas of low temperature and low pressure and flows into the waste heat recovery heat exchanger 41.

Here, the refrigerant expansion device 60 includes an expansion valve 61, a plurality of capillaries 62 and the distributor 63. In detail, the expansion valve 61 expands the high temperature refrigerant discharged through the refrigerant discharge pipe 17b of the heat source heat exchanger 17 and converts the refrigerant into a low pressure refrigerant. The distributor 63 collects the low pressure refrigerant expanded by the expansion valve 61 and distributes the refrigerant to the plurality of capillaries 62. The refrigerant passing through the capillary tube 62 is supplied to the waste heat recovery heat exchanger 41.

That is, as shown in Figure 4, the heat source generation heat exchanger 17, the refrigerant expansion device 60, the waste heat recovery heat exchanger 41 and the compressor 50 constitute a kind of refrigeration cycle. And the refrigerant is heat from the hot air discharged from the dryer 30 while circulating the heat source generation heat exchanger 17, the refrigerant expansion device 60, the waste heat recovery heat exchanger 41 and the compressor 50 in sequence. To recover the heat is supplied to the low-temperature air supplied to the dryer (30).

That is, the coolant in the low temperature state is supplied to the air supplied into the dryer 30 while passing through the heat source heat exchanger 17 so that the coolant in the low temperature state changes to the gas state when the coolant passes through the coolant expansion device 60. This results in supercooling to extremely low temperatures. The supercooled gas passes through the waste heat recovery heat exchanger 41 and absorbs the surrounding heat, thereby lowering the ambient temperature. The gas refrigerant absorbing the surrounding heat in the waste heat recovery heat exchanger 41 is a compressor (50). It is compressed into a high temperature and high pressure through a) and converted into a high temperature liquid state. This high temperature liquid refrigerant moves to a heat source heat exchanger 17 serving as a condenser, and is exchanged with ambient air that is sucked by the fan blower 14 and passes through the heat source heat exchanger 17. Therefore, the air passing through the heat exchanger heat exchanger 17 is converted into hot air. This hot air is supplied into the dryer 30 through the discharge duct 18. On the other hand, the high temperature liquid refrigerant becomes the low temperature liquid refrigerant while passing through the heat source heat exchanger 17.

Here, the integrated heat exchange unit 10 according to an embodiment of the present invention is characterized by using a liquid such as water, rather than using conventional R22, R407C, R410A, or the like as a refrigerant.

In detail, in the conventional integrated heat exchange unit, the refrigerant used in the general heat pump is used as it is. By the way, in the case of the refrigerant used in the conventional heat pump, since it is supposed to operate in a relatively low temperature environment such as room temperature, refrigerants such as R22, R407C, R410A and the like have been used. However, in the integrated heat exchange unit of the present invention, its operating environment is relatively high temperature than in a general heat pump, and therefore, there is less need to use refrigerants such as R22, R407C, R410A and the like. Therefore, in the integrated heat exchange unit 10 according to an embodiment of the present invention, a liquid such as water is applied as a refrigerant, and thus it is possible to operate up to a high temperature of about 360 ° C., which reduces power consumption to about 48% or less. You can get the effect.

Since the integrated heat exchange unit 10 including the waste heat recovery device of the present invention is equipped with the waste heat recovery heat exchanger 41 in the exhaust duct 40, the waste heat recovery device is mounted as close as possible to the dryer 30. Nearly 100% of waste heat can be used before heat loss occurs as waste heat passes through the exhaust. In order to recover the maximum amount of waste heat under the condition of nearly 100% waste heat utilization, the freezing principle was applied to maximize the waste heat recovery rate. In addition, the heat source generating heat exchanger 17 was used as a high temperature generating heat exchanger to produce high temperature heat, and was used as a heat supply source for supplying the dryer 30.

The power source of the integrated heat exchange unit 10 equipped with the waste heat recovery device of the present invention is electricity, and a place where most of the energy is consumed is the compressor 50, and the power consumption of the compressor 50 is the heat exchanger 41 for waste heat recovery. As the supercooled gas absorbs more of the surrounding thermal energy, it decreases significantly.

The most important point in the integrated heat exchange unit 10 equipped with the waste heat recovery device of the present invention is to recover and reuse the heat source of waste heat generated in the dryer 30 without loss as much as possible, so that the air of temperature required for drying with a small amount of energy consumption is reduced. To produce. That is, the high-temperature, high-pressure gas refrigerant compressed by the compressor 50 primarily heats the air while passing through the heat exchanger 17 for heat source generation, and the heated air is supplied into the dryer 30. In addition, the air that has been dried in the dryer 30 is exhausted to the outside. At this time, the waste heat recovery heat exchanger 41 is installed in the exhaust duct 40 to recover 80% or more of the waste heat exhausted through the refrigerant and compress the air. Only the pure heat source will be reused.

Thus, each time one cycle is completed, the temperature of the air rises, where energy consumption requires only the power needed to operate the compressor, so that only a small amount of power can be used to produce hot heat. That is, since the waste heat generated is recovered from the nearest place and used in the nearest place, the heat loss due to exposure can be reduced, and the efficiency is increased, so that the energy consumption is reduced.

The integrated heat exchange unit 10 having the waste heat recovery device of the present invention is designed for high temperature heat exchange, not a cooling device, in consideration of different critical temperature points of the refrigerant by calculating the amount of heat required for the dryer 30. Therefore, the heat transfer area of the heat exchanger is produced about 2 to 3 times in proportion to the capacity of the compressor because it uses high temperature heat unlike the conventional cooler or air conditioner.

In the integrated heat exchange unit 10 having the waste heat recovery device of the present invention, the consumption of electrical energy is mainly consumed in the compressor 50, which consumes minimal power by the reuse condition of the heat source and is 15 compared with the conventional electric heater method. Only 20% to 20% power is consumed.

In consideration of the different compression ratio and the critical temperature of the refrigerant in accordance with the operating temperature condition of the dryer 30, it is possible to manufacture a heat generator (heat exchanger) at low to medium or low temperature or more. This is a key technology that can be continuously applied with the development of new refrigerants and compressors.

The integrated heat exchange unit 10 provided with the waste heat recovery device of the present invention is a technique different from the conventional heat pump. Since the conventional heat pump method is manufactured for two purposes of cooling and heating, the number of parts to be mounted is increased compared to the present invention, and the energy consumption at an extremely low temperature of the subzero region is provided by installing the outdoor unit externally during heating. Increase in number, and normal operation is not possible, but the present invention is installed in most industrial production equipment spaces not in the sub-zero region, so there is no operation in the sub-zero region, and the energy consumption rate is always reused because the waste heat generated when the production equipment is operated is always reused. This can keep constant and normal operation.

In the present specification, the present invention has been described with reference to limited embodiments, but various embodiments are possible within the scope of the present invention. In addition, although not described, equivalent means will also be referred to as incorporated in the present invention. Therefore, the true scope of the present invention will be defined by the claims below.

10: integral heat exchange unit 11: inlet
12: suction chamber 13: HEPA filter
14: fan blower 15: drive unit
16: Duct 17: Heat exchanger for heat source generation
18: discharge duct 40: exhaust duct
41: heat exchanger for waste heat recovery 50: compressor
60: refrigerant expansion device

Claims (1)

In the integrated heat exchange unit 10 for supplying hot air into the dryer 30,
A fan blower (14) flowing from the outside and passing the HEPA filter (HEPA: High Efficiency Particulate Air) to supply filtered air into the integrated heat exchange unit (10);
A discharge duct (18) connected to the dryer (30) to supply air introduced from the outside by the fan blower (14) to the dryer (30);
A compressor (50) formed at one side of the discharge duct (18) to compress the low temperature low pressure refrigerant into a high temperature high pressure refrigerant;
Is formed on one side of the discharge duct 18, the heat source for generating a first heat exchange between the refrigerant delivered from the compressor 50 and the air supplied to the dryer 30 through the discharge duct 18 Heat exchanger 17;
An expansion valve 61 for expanding a high temperature refrigerant transferred from the heat source heat exchanger 17 and converting the refrigerant into a low pressure refrigerant, and collecting the low pressure refrigerant expanded at the expansion valve 61 to collect the waste heat recovery heat exchanger; And a distributor (63) for distributing into a plurality of capillaries (62) for supplying to the group (41), wherein the first heat exchange is performed to convert the condensed high temperature refrigerant into a low temperature low pressure refrigerant. ; And
It is formed in the exhaust duct 40 in communication with the exhaust part 32 for exhausting the waste heat in the dryer 30 to the outside, and is discharged through the refrigerant delivered from the refrigerant expansion device 60 and the exhaust duct 40. And a waste heat recovery heat exchanger (41) in which a second heat exchange is performed between the waste heat of a high temperature.
The refrigerant is water, and the refrigerant circulates in the compressor 50, the heat source heat exchanger 17, the refrigerant expansion device 60, and the waste heat recovery heat exchanger 41,
In the first heat exchange, heat is transferred from the refrigerant delivered from the compressor 50 to the air supplied to the dryer 30 through the discharge duct 18.
The second heat exchange is heat is transferred to the refrigerant delivered from the refrigerant expansion device 60 in the high temperature waste heat discharged through the exhaust duct 40,
The second heat exchange is performed in a range of 50 ° C. or higher and 360 ° C. or lower,
The exhaust duct 40 is an integral heat exchange unit having a waste heat recovery unit, characterized in that formed in the upper portion of the discharge duct (18).

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