Hot air generation device and hot air generation method

Abstract

To provide a hot air generation device and a hot air generation method capable of generating high-temperature dehumidified air while saving energy.SOLUTION: A hot air generation device 1 includes a precooler device 3, a preheater device 4 and a heat pump device 5. The precooler device 3 is connected so that a heat transfer medium circulates between the precooler and the heat pump device 5, and cools and dehumidifies outside air OA by using the cooled heat transfer medium generated by the heat pump device 5 to generate dehumidified air. The preheater device 4 preheats the dehumidified air by using waste heat generated by a condenser 11 to generate warm air WA. The heat pump device 5 heats the warm air WA to generate hot air HA.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a hot air generating device and a hot air generating method. [Background technology]

[0002] Conventionally, it has been known to generate dehumidified dry air (hereinafter referred to as dehumidified air) by adsorbing moisture in the air using a desiccant rotor or by cooling and dehumidifying the air (hereinafter referred to as cooling dehumidification). When generating dehumidified air using a desiccant rotor, heat of adsorption is generated when the desiccant rotor adsorbs moisture. For this reason, a technology has been proposed in which the desiccant rotor is used in combination with a heat pump device to efficiently use the air heated by the heat of adsorption (see, for example, Patent Document 1).

[0003] In this system, the air heated by the heat of adsorption is cooled by the air cooler of the heat pump device. To release the moisture adsorbed in the desiccant rotor, the air passing through the desiccant rotor is heated by the air heater of the heat pump device, thereby improving the operating efficiency of the device. On the other hand, when dehumidified air is generated by cooling and dehumidifying, a cooling unit that cools the air and a heating unit that heats the air cooled by the cooling unit are provided (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-16090 [Patent Document 2] Japanese Patent Application Publication No. 5-312470 Summary of the Invention [Problem to be solved by the invention]

[0005] However, there is a demand for an energy-saving device with improved operating efficiency in the above-mentioned Patent Document 1. The above-mentioned Patent Document 2 has a problem in that, because the air to be dehumidified is cooled, excessive energy is required to generate high-temperature dehumidified air.

[0006] Therefore, the present invention provides a hot air generating device and a hot air generating method that can generate high-temperature dehumidified air in an energy-saving manner. [Means for solving the problem]

[0007] In order to solve the above problems, the hot air generating device of the present invention comprises a precooler device, a preheater device, and a heat pump device, wherein the precooler device is connected so that a heat transfer medium is circulated between the precooler device and the heat pump device, and generates dehumidified air by cooling and dehumidifying air using the cooled heat transfer medium generated by the heat pump device, the preheater device generates warm air by preheating the dehumidified air using exhaust heat generated externally, and the heat pump device generates hot air by heating the warm air.

[0008] With this configuration, the air is cooled and dehumidified using the heat transfer medium generated by the heat pump device, so dehumidified air can be generated with energy conservation. Moreover, this dehumidified air is heated using waste heat generated outside, so the dehumidified air can be heated to a high temperature and warm air can be generated with energy conservation. This warm air is further heated by the heat pump device to generate hot air, so high-temperature dehumidified air can be generated with energy conservation.

[0009] In the above configuration, a supply-side heat exchanger may be provided, and the supply-side heat exchanger may utilize the exhaust heat to heat the heat transfer medium that is returned from the precooler device to the heat pump device.

[0010] This configuration makes it possible to adjust the temperature of the heat transfer medium returned to the heat pump unit, thereby improving the driving efficiency of the heat pump unit and easily adjusting the temperature of the hot air.

[0011] In the above configuration, the system may include an air temperature detection unit and a precooler inlet flow rate control valve, wherein the air temperature detection unit detects the temperature of the dehumidified air, and the precooler inlet flow rate control valve adjusts the flow rate of the heat transfer medium supplied to the precooler device based on the detection result of the air temperature detection unit.

[0012] With this configuration, the temperature of the dehumidified air can be controlled to a desired temperature, and the temperature of the hot air can also be easily controlled, providing an energy-saving, high-quality hot air generator.

[0013] In the above configuration, the system may include a medium temperature detection unit and a heat exchanger inlet flow rate control valve, wherein the medium temperature detection unit detects the temperature of the heat transfer medium immediately before being returned to the heat pump device, and the heat exchanger inlet flow rate control valve adjusts the flow rate of the heat transfer medium supplied to the supply-side heat exchanger based on the detection result of the medium temperature detection unit.

[0014] This configuration allows the temperature of the heat transfer medium returned to the heat pump unit to be controlled to a desired temperature, thereby improving the driving efficiency of the heat pump unit and controlling the temperature of the hot air to a desired temperature, thereby providing a more energy-efficient and high-quality hot air generator.

[0015] The hot air generating device of the present invention comprises a precooler device, a preheater device, a discharge side heat exchanger, and a heat pump device, wherein the precooler device is connected so that a heat transfer medium is circulated between the precooler device and the heat pump device, and generates dehumidified air by cooling and dehumidifying air using the cooled heat transfer medium generated by the heat pump device, the preheater device generates warm air by preheating the dehumidified air using exhaust heat generated externally, and the discharge side heat exchanger heats the warm air using another heated heat transfer medium generated by the heat pump device to generate hot air.

[0016] With this configuration, the heat transfer medium generated by the heat pump device is used to cool and dehumidify air, allowing for the generation of dehumidified air with reduced energy consumption. Furthermore, the dehumidified air is heated using waste heat generated externally, allowing for the generation of high-temperature dehumidified air with reduced energy consumption. This warm air is then further heated using another heated heat transfer medium generated by the heat pump device to generate hot air. This allows for the generation of high-temperature dehumidified air with reduced energy consumption.

[0017] The hot air generating method of the present invention includes a cooling and dehumidifying step of cooling and dehumidifying air using a cooled heat transfer medium generated by a heat pump device to generate dehumidified air, a preheating step of preheating the dehumidified air using exhaust heat generated externally after the cooling and dehumidifying step to generate hot air, and a hot air generating step of heating the hot air using the heat pump device after the preheating step to generate hot air.

[0018] This method makes it possible to generate high-temperature dehumidified air by utilizing the cooled heat transfer medium generated by the heat pump device and external exhaust heat, thereby providing an energy-saving method for generating hot air.

[0019] The hot air generating method according to the present invention includes a cooling and dehumidifying step of cooling and dehumidifying air using a cooled heat transfer medium generated by a heat pump device to generate dehumidified air, a preheating step of preheating the dehumidified air using exhaust heat generated externally after the cooling and dehumidifying step to generate hot air, and a hot air generating step of heating the hot air using another heated heat transfer medium generated by the heat pump device after the preheating step to generate hot air.

[0020] This method allows for the generation of high-temperature dehumidified air using the cooled heat transfer medium generated by the heat pump device and external exhaust heat. Furthermore, the hot air can be easily generated by heating the warm air using another heated heat transfer medium generated by the heat pump device. This provides an energy-saving method for generating hot air. [Effects of the Invention]

[0021] According to the present invention, it is possible to provide a hot air generating device and a hot air generating method that can generate high-temperature dehumidified air in an energy-saving manner. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a schematic configuration diagram of a hot air generating device according to an embodiment of the present invention. [Figure 2] FIG. 10 is a schematic configuration diagram of a hot air generating device according to a modified example of an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] Next, an embodiment of the present invention will be described with reference to the drawings.

[0024] <Hot air generator> FIG. 1 is a schematic diagram of the hot air generating device 1. As shown in FIG. As shown in Figure 1, the hot air generator 1 is a device that takes in outside air (OA), dehumidifies it, and heats it to generate dehumidified, high-temperature air (hereinafter referred to as hot air). For example, the hot air generator 1 is used to dry wood chips that are used as fuel to drive a steam turbine (not shown). Hereinafter, the upstream side of the flow of outside air (OA) will be simply referred to as the upstream side, and the downstream side of the flow of outside air (OA) will be simply referred to as the downstream side.

[0025] The hot air generating device 1 mainly comprises a filter 2, a precooler device 3 provided downstream of the filter 2, a preheater device 4 provided downstream of the precooler device 3, a heat pump device 5 provided downstream of the preheater device 4, a suction fan 30 provided downstream of the heat pump device 5, and a supply side heat exchanger 7 connected to the precooler device 3.

[0026] The outside air OA sucked in by the suction fan 30 passes through the filter 2 and the precooler device 3. The precooler device 3 is connected to the heat pump device 5 via a first refrigerant circulation path 6. A first heat transfer medium (an example of a heat transfer medium in the claims) circulates between the precooler device 3 and the heat pump device 5 via the first refrigerant circulation path 6. Various refrigerants, including liquids such as water, can be used as the first heat transfer medium. Hereinafter, the flow path of the first refrigerant circulation path 6 through which the first heat transfer medium flows from the heat pump device 5 to the precooler device 3 will be referred to as the outward refrigerant circulation path 6a. The flow path of the first refrigerant circulation path 6 through which the first heat transfer medium flows from the precooler device 3 to the heat pump device 5 will be referred to as the return refrigerant circulation path 6b.

[0027] In the first refrigerant circulation path 6, near the precooler device 3, a precooler inlet flow rate adjustment valve 8 is provided, which is connected to the outward refrigerant circulation path 6a and the return refrigerant circulation path 6b. The precooler inlet flow rate adjustment valve 8 is, for example, a three-way valve. By adjusting the opening of the precooler inlet flow rate adjustment valve 8, the flow rate of the first heat transfer medium flowing from the heat pump unit 5 to the precooler unit 3 via the outward refrigerant circulation path 6a is adjusted.

[0028] The opening degree of the precooler inlet flow rate adjustment valve 8 is controlled based on the detection result of an air temperature detection unit 9 provided downstream of the precooler device 3. More specifically, the air temperature detection unit 9 detects the temperature of the outside air OA (dehumidified air DA, which will be described later) that has passed through the precooler device 3. The detection result is output as a signal to a control unit (not shown). The control unit controls the opening of the precooler inlet flow rate adjustment valve 8.

[0029] The outside air OA that has passed through the precooler device 3 passes through the preheater device 4. The preheater device 4 is connected to a condenser 11 of a steam turbine (not shown) via a condensate circulation path 12. Condensate circulates between the preheater device 4 and the condenser 11 via the condensate circulation path 12. Hereinafter, the flow path of the condensate circulation path 12 through which condensate flows from the condenser 11 to the preheater device 4 will be referred to as an outward condensate circulation path 12a. The flow path of the condensate circulation path 12 through which condensate flows from the preheater device 4 to the condenser 11 will be referred to as an inward condensate circulation path 12b.

[0030] The outside air OA that has passed through the preheater device 4 passes through the heat pump device 5. The heat pump device 5 is composed of a compressor 13, an evaporator 14, an expansion valve 15, a condenser 16, etc. Of these, outside air OA (warm air WA, described later) passes through the condenser 16. After passing through the condenser 16, the outside air OA is blown by a suction fan 30 into a container (not shown) that contains wood chips. A first refrigerant circulation path 6 is connected to the evaporator 14. The evaporator 14 of the heat pump device 5 and the precooler device 3 are connected via the first refrigerant circulation path 6.

[0031] The supply-side heat exchanger 7 is connected in the return refrigerant circuit 6b between the precooler device 3 and the evaporator 14 of the heat pump device 5. The supply-side heat exchanger 7 is also connected in the return condensate circuit 12b between the preheater device 4 and the condenser 11. The supply-side heat exchanger 7 exchanges heat between the first heat transfer medium flowing in the return refrigerant circuit 6b and the condensate flowing in the return condensate circuit 12b.

[0032] A heat exchanger inlet flow rate control valve 17 is provided in the return refrigerant circulation path 6b near the supply-side heat exchanger 7 and connected to the inlet 7a and outlet 7b of the supply-side heat exchanger 7. The heat exchanger inlet flow rate control valve 17 is, for example, a three-way valve. By adjusting the opening of the heat exchanger inlet flow rate control valve 17, the flow rate of the first heat transfer medium supplied from the precooler device 3 to the supply-side heat exchanger 7 via the return refrigerant circulation path 6b is adjusted.

[0033] The opening degree of the heat exchanger inlet flow rate adjustment valve 17 is controlled based on the detection result of a medium temperature detection unit 18 provided in the return refrigerant circulation path 6b near the heat pump unit 5. More specifically, the medium temperature detection unit 18 detects the temperature of the first heat transfer medium immediately before being returned to the heat pump unit 5 via the return refrigerant circulation path 6b. This detection result is output as a signal to a control unit (not shown). The control unit controls the opening degree of the heat exchanger inlet flow rate adjustment valve 17.

[0034] <Hot air generation method> Next, a method for generating hot air using the hot air generator 1, that is, the operation of the hot air generator 1, will be described. First, the first heat transfer medium flowing through the first refrigerant circulation path 6 has heat removed by the evaporator 14 of the heat pump unit 5, and then passes through the outward refrigerant circulation path 6a and is supplied to the precooler unit 3. That is, the cooled first heat transfer medium generated by the heat pump unit 5 is supplied to the precooler unit 3 via the outward refrigerant circulation path 6a. Therefore, the precooler unit 3 cools and dehumidifies the outside air OA, and dehumidified air DA is generated (cooling and dehumidification process).

[0035] The flow rate of the first heat transfer medium supplied to the precooler device 3 is controlled by the precooler inlet flow rate adjustment valve 8, so that the temperature of the dehumidified air DA is controlled to a desired temperature. For example, if the temperature of the dehumidified air DA falls below a predetermined value, the precooler inlet flow rate adjustment valve 8 cuts off the supply of the first heat transfer medium to the precooler device 3. The first heat transfer medium absorbs heat from the outside air OA in the precooler device 3. Therefore, the temperature of the first heat transfer medium flowing through the return refrigerant circulation path 6b becomes higher than the temperature of the first heat transfer medium flowing through the outward refrigerant circulation path 6a.

[0036] For example, the temperature of the first heat transfer medium flowing through the outward refrigerant circulation path 6a is about 7°C. The temperature of the dehumidified air DA is about 12°C. The absolute humidity of the dehumidified air DA is 10 g / m 3 ] around. For example, when the temperature of the dehumidified air DA detected by the air temperature detection unit 9 is lower than a predetermined value, in other words, when the temperature of the outside air OA is lower than 7°C, the supply of the first heat transfer medium to the precooler device 3 is cut off. In this case, the precooler inlet flow rate adjustment valve 8 bypasses the outward refrigerant circulation path 6a and the return refrigerant circulation path 6b without passing through the precooler device 3.

[0037] Condensate from a condenser 11 is supplied to a preheater 4 provided downstream of the precooler 3. The condensate is water obtained by converting steam used in a steam turbine (not shown) back into water by the condenser 11. In other words, the condensate is the waste heat of the steam turbine. The temperature of the condensate is, for example, around 40°C. This waste heat is used by the preheater 4 to raise the temperature of the dehumidified air DA, generating hot air WA (preheating process). The temperature of the hot air WA is, for example, around 25°C.

[0038] Here, the temperature of the first heat transfer medium flowing through the return refrigerant circuit 6b is sufficiently lower than the temperature of the condensate flowing through the return condensate circuit 12b. Therefore, the first heat transfer medium flowing through the return refrigerant circuit 6b is heated by the supply-side heat exchanger 7. The flow rate of the first heat transfer medium supplied to the supply-side heat exchanger 7 is controlled by the heat exchanger inlet flow control valve 17, so that the temperature of the first heat transfer medium supplied to the heat pump unit 5 is controlled to a desired temperature.

[0039] For example, when the temperature of the first heat transfer medium detected by medium temperature detector 18 exceeds a predetermined value, heat exchanger inlet flow rate control valve 17 cuts off the supply of the first heat transfer medium to supply-side heat exchanger 7. In this case, heat exchanger inlet flow rate control valve 17 bypasses inlet port 7a and outlet port 7b without passing through supply-side heat exchanger 7. For example, the temperature of the first heat transfer medium returned to heat pump unit 5 is around 12°C.

[0040] In the heat pump device 5, the hot air WA is heated by the condenser 16. As a result, the hot air HA is generated by the heat pump device 5 (hot air generation process). For example, the temperature of the hot air HA is around 76°C. The absolute humidity of the hot air HA is 8 g / m 3 ] around.

[0041] As described above, the hot air generator 1 includes the precooler device 3, the preheater device 4, and the heat pump device 5. The precooler device 3 is connected to the heat pump device 5 so that a first heat transfer medium circulates between the precooler device 3 and the heat pump device 5. The precooler device 3 cools and dehumidifies the outside air OA using the cooled first heat transfer medium generated by the heat pump device 5, generating dehumidified air DA. This allows the dehumidified air DA to be generated with less energy.

[0042] The preheater device 4 is connected to a condenser 11 of a steam turbine (not shown) so that condensate circulates between the preheater device 4 and the condenser 11. The preheater device 4 generates hot air WA by utilizing the exhaust heat (condensate) of the steam turbine (not shown). This allows the temperature of dehumidified air DA to be increased while saving energy, and hot air WA can be generated. This warm air WA is then heated by the heat pump device 5 to generate hot air HA. This makes it possible to generate high-temperature dehumidified air in an energy-saving manner.

[0043] The hot air generator 1 includes a supply-side heat exchanger 7. The supply-side heat exchanger 7 heats the first heat transfer medium returned to the heat pump unit 5 by utilizing exhaust heat (condensate) from a steam turbine (not shown). This makes it possible to adjust the temperature of the first heat transfer medium returned to the heat pump unit 5 in an energy-saving manner. This makes it possible to easily adjust the temperature of the hot air HA while improving the driving efficiency of the heat pump unit 5.

[0044] The hot air generator 1 includes an air temperature detector 9 and a precooler inlet flow rate adjustment valve 8. The air temperature detector 9 detects the temperature of the dehumidified air DA, and the flow rate of the first heat transfer medium supplied to the precooler device 3 is adjusted based on the detection result. This allows the temperature of the dehumidified air DA to be adjusted to a desired temperature. This makes it possible to provide an energy-saving, high-quality hot air generator 1.

[0045] The hot air generator 1 includes a medium temperature detector 18 and a heat exchanger inlet flow rate adjustment valve 17. The medium temperature detector 18 detects the temperature of the first heat transfer medium immediately before being returned to the heat pump unit 5, and adjusts the flow rate of the first heat transfer medium supplied to the supply-side heat exchanger 7 based on this detection result. This makes it possible to control the temperature of the first heat transfer medium returned to the heat pump unit 5 to a desired temperature. Therefore, it is possible to control the temperature of the hot air HA to a desired temperature while improving the driving efficiency of the heat pump unit 5. This makes it possible to provide a hot air generator 1 that is even more energy-efficient and high-quality.

[0046] The above-described hot air generation method includes a cooling and dehumidifying step in which the cooled first heat transfer medium generated by the heat pump unit 5 is used to cool and dehumidify outside air OA, generating dehumidified air DA. After the cooling and dehumidifying step, a preheating step is performed in which the dehumidified air DA is heated using exhaust heat (condensate) from a steam turbine (not shown) to generate warm air WA. After the preheating step, a hot air generation step is performed in which the warm air WA is heated using the heat pump unit 5 to generate hot air HA. In this way, dried hot air HA can be generated using the cooled first heat transfer medium generated by the heat pump unit 5 or external exhaust heat. This provides an energy-saving hot air generation method.

[0047] [Variations] In the above embodiment, the case where the warm air WA is directly heated by the heat pump unit 5 to generate the hot air HA has been described. However, this is not limited to this, and the warm air WA may be heated using a second heat transfer medium (an example of another heat transfer medium in the claims) heated by the heat pump unit 5 to generate the hot air HA. This will be described in detail below.

[0048] 2 is a schematic diagram of the hot air generator 1 in a modified example. FIG. 2 corresponds to the above-mentioned FIG. As shown in Fig. 2, the hot air generator 1 includes a discharge-side heat exchanger 20 provided downstream of the preheater device 4. The discharge-side heat exchanger 20 is connected to the condenser 16 of the heat pump device 5 via a second refrigerant circulation path 21. A second heat transfer medium circulates between the discharge-side heat exchanger 20 and the condenser 16 via the second refrigerant circulation path 21. Various refrigerants, including liquids such as water, can be used as this second heat transfer medium.

[0049] With this configuration, dehumidified air DA is generated by the precooler device 3 (cooling and dehumidifying process). Thereafter, the temperature of the dehumidified air DA is raised by the preheater device 4, and hot air WA is generated (preheating process). A second heat transfer medium heated by the heat pump device 5 is supplied to the discharge-side heat exchanger 20 provided downstream of the preheater device 4. As a result, the hot air WA is heated by the discharge-side heat exchanger 20, and hot air HA is generated (hot air generation process). Therefore, according to the above-described modified example, it is possible to achieve the same effects as the above-described embodiment.

[0050] The present invention is not limited to the above-described embodiment, and includes various modifications to the above-described embodiment without departing from the spirit of the present invention. For example, in the above embodiment, the hot air generator 1 is described as being used to dry wood chips that are used as fuel to drive a steam turbine (not shown). However, this is not a limitation, and the hot air generator 1 can be used for various purposes that require high-temperature dehumidified air.

[0051] In the above embodiment, the case where the condensate of the condenser 11 used in the steam turbine (not shown) is used as the waste heat generated externally and used to heat the dehumidified air DA by the preheater device 4 has been described. However, this is not limited to this, and various types of waste heat generated externally can be used. For example, the waste heat generated externally can be heat from adsorption when the desiccant rotor adsorbs moisture, or geothermal heat. The outside refers to an outside other than the hot air generating device 1. The waste heat generated externally can be naturally occurring heat, heat generated by the device, or the like, but is not particularly limited thereto.

[0052] In the above embodiment, the temperature of the condensed water as the waste heat generated externally is, for example, around 40°C. However, this is not limited to this, and waste heat of various temperatures can be used to heat the dehumidified air DA via the preheater device 4. In particular, the above-described hot air generator 1 can suitably use exhaust heat of 50°C or less. That is, if high-temperature exhaust heat of, for example, 80°C, could be used inexhaustibly, it may be possible to eliminate the need for the heat pump device 5. However, when unused energy (exhaust heat) of 50°C or less is to be used to raise the temperature of the dehumidified air DA, by combining the heat pump device 5 as in the above-described embodiment, it is possible to effectively use unused energy that has not previously had any use.

[0053] In the above embodiment, the precooler inlet flow rate adjustment valve 8 and the heat exchanger inlet flow rate adjustment valve 17 are, for example, three-way valves. However, the present invention is not limited to this, and any valve that can adjust the flow rate of the heat transfer medium may be used. [Explanation of symbols]

[0054] 1…Hot air generator 3...Precooler device 4...Preheater device 5...Heat pump equipment 6...First refrigerant circulation path 7…Supply side heat exchanger 8...Precooler inlet flow control valve 9...Air temperature detection section 17...Heat exchanger inlet flow control valve 18...Medium temperature detector 20…Discharge side heat exchanger 21...Second refrigerant circulation path HA…hot air OA…outside air WA...warm air

Claims

1. A precooler device; a preheater device; A heat pump device; Equipped with the precooler device is connected to the heat pump device so that a heat transfer medium is circulated between the precooler device and the heat pump device, and generates dehumidified air by cooling and dehumidifying air using the cooled heat transfer medium generated by the heat pump device; The preheater device generates hot air by preheating the dehumidified air using exhaust heat generated outside, The heat pump device generates hot air by heating the warm air. A hot air generating device characterized by:

2. A supply-side heat exchanger is provided, The supply-side heat exchanger uses the exhaust heat to heat the heat transfer medium that is returned from the precooler device to the heat pump device.

2. The hot air generating device according to claim 1.

3. an air temperature detection unit; a precooler inlet flow rate adjustment valve; Equipped with the air temperature detection unit detects the temperature of the dehumidified air; The precooler inlet flow rate adjustment valve adjusts the flow rate of the heat transfer medium supplied to the precooler device based on the detection result of the air temperature detection unit.

3. The hot air generating device according to claim 1 or 2.

4. a medium temperature detection unit; a heat exchanger inlet flow rate adjustment valve; Equipped with the medium temperature detection unit detects the temperature of the heat transfer medium immediately before being returned to the heat pump device; The heat exchanger inlet flow rate adjustment valve adjusts the flow rate of the heat transfer medium supplied to the supply-side heat exchanger based on the detection result of the medium temperature detection unit.

3. The hot air generating device according to claim 2.

5. A precooler device; a preheater device; a discharge side heat exchanger; A heat pump device; Equipped with the precooler device is connected to the heat pump device so that a heat transfer medium is circulated between the precooler device and the heat pump device, and generates dehumidified air by cooling and dehumidifying air using the cooled heat transfer medium generated by the heat pump device; The preheater device generates hot air by preheating the dehumidified air using exhaust heat generated outside, The discharge-side heat exchanger heats the warm air using another heat transfer medium heated by the heat pump device to generate hot air. A hot air generating device characterized by:

6. a cooling and dehumidifying step of cooling and dehumidifying air using a cooled heat transfer medium generated by the heat pump device to generate dehumidified air; a preheating step of preheating the dehumidified air using exhaust heat generated outside after the cooling and dehumidifying step to generate warm air; After the preheating step, a hot air generating step of heating the warm air using the heat pump device to generate hot air; having A method for generating hot air.

7. a cooling and dehumidifying step of cooling and dehumidifying air using a cooled heat transfer medium generated by the heat pump device to generate dehumidified air; a preheating step of preheating the dehumidified air using exhaust heat generated outside after the cooling and dehumidifying step to generate warm air; After the preheating step, a hot air generating step of heating the warm air using another heat transfer medium heated by the heat pump device to generate hot air; having A method for generating hot air.

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