JPH0237251A - Hot air heater - Google Patents

Abstract

PURPOSE:To provide a hot air heater characterized by quick start-up by installing a heat storage vessel which is filled with latent heat storage material supercooled in a stable state, a means for stopping the supercooling of the heat storage material, an electric heater as a source of heat for heat storage, all in a hot air-circulating duct, and by controlling the electric heater. CONSTITUTION:When an operation switch is pressed, combustion is started at a burner 8 in a combustion chamber 9. It takes time for the combustion to assume a steady state, therefore, simultaneously with the pressing of the operation switch of the hot air heater a supercooling-stopping means 5 is actuated so that the supercooling of latent heat storage material 4 in a heat storage vessel 3 is stopped and the heat stored is released therefrom. When the combustion in the operation of a hot air heater, by which heat is stored in a heat storage vessel 3, is so low that the temperature of the hot air of the latent heat storage material 4 in the heat storage vessel 3 does not reach a point at which a change of phase occurs, an electric heater 6 provided inside the latent heat storage material 4 can be energized simultaneously with the ending of the operation so as to heat the latent heat storage material 4 up to a temperature causing a change of phase. Thus heat can be stored with the latent heat storage material 4 restored certainly to a supercooled state so that quick heating at the start-up is possible at the subsequent use of the hot air heater.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a hot air heater equipped with a heat storage tank.

(Prior art) Conventionally, as a method of heating by circulating hot air indoors, there are open type hot air heaters whose heat source is a combustor that uses gas or kerosene as fuel, and forced air supply and exhaust type hot air heaters. , a hot water circulation type hot air heater, a heat dump type hot air heater using a refrigeration cycle, and an electric hot air type heater using an electric heater as a heat source are generally known.

However, as shown in the comparison table of various hot air heaters in Table 1, in hot air heaters that use one combustor as a heat source, running costs are low when using kerosene, but kerosene takes a long time to vaporize. Because of this, the start-up time is delayed. In addition, forced air supply and exhaust systems and hot water circulation systems can keep the room clean, but they have the disadvantage of slow start-up due to the large heat capacity of the heat exchanger. The heat pump type has relatively low running costs and good cleanliness, but it also takes a long time to start up. Electric hot air heaters start up quickly and are clean, but they have the disadvantage of extremely high running costs.

In this way, if the start-up of the oil forced supply/exhaust type, oil hot water circulation type, and heat pump type can be improved, running costs will be low and clean heating will be possible.

Therefore, in order to improve the rise, a combination with a heat storage material may be considered. However, in conventional devices that utilize heat storage, it is necessary to cover the heat storage tank with a heat insulating material to reduce heat loss, leading to larger and more expensive devices.

In order to improve this drawback, it is possible to use a latent heat storage material that has a stable supercooled state, but the temperature of the hot air becomes low due to the adjustment of the thermal power of the hot air heater, and the heat storage in the heat storage tank becomes insufficient. The disadvantage is that the material does not reach a supercooled state and radiates heat unnecessarily, making it impossible to use the stored thermal energy when needed.

(Problems to be Solved by the Invention) As described above, in a hot air heater using a conventional heat storage material, when the thermal power of the hot air heater is adjusted by inverter control etc., the temperature of the hot air becomes low. , Heat storage in the heat storage tank was insufficient, and the heat storage material did not reach a supercooled state and radiated heat unnecessarily, making it impossible to use the stored energy when needed, which delayed the start-up of hot air heating.

The present invention has been made in view of the above-mentioned t#, and an object of the present invention is to provide a hot air heater that starts up quickly and can reliably obtain hot air at the same time as operation.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the hot air heater of the present invention includes a heat storage tank filled with a latent heat storage material having a stable supercooled state, and a heat storage tank filled with a latent heat storage material having a stable supercooled state, and By installing a supercooling release means for releasing the supercooled state of the heat storage material and an electric heater of the heat storage heat source installed in the heat storage tank in the hot air circulation path of the hot air heater, and controlling the electric heater. It is characterized by storing heat in a heat storage tank.

(Function) In the device configured in this way, the warm air circulation path Kv
By installing an electric heater as a heat storage heat source inside the heat storage tank filled with the latent heat storage material, and controlling the power supply to this electric heater, the heat storage material can be reliably mixed even when the hot air temperature decreases when the thermal power is reduced. Since it can be heated to varying temperatures and a supercooled state can be obtained, hot air can be reliably obtained at the same time as the heater is operated.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a sectional view showing a hot air heater according to an embodiment of the present invention.

In the figure, a heat storage tank 3 is arranged in a hot air circulation path 2 of a hot air heater main body 1. The interior of the heat storage tank 3 is filled with a latent heat storage material 4 having a stable supercooled state, and a supercooling release means 5 is provided outside the heat storage tank 3 to contact the latent heat storage material 4 and release the supercooled state. It is arranged on the downstream side of the hot air circulation path 2. In addition, an electric heater, which is a heat source for storing heat in the latent heat storage material 4 in the heat storage tank 3, is installed.
A first temperature detection means 7 for detecting the temperature of the latent heat storage material 4 is installed on the downstream side of the latent heat storage material 4 (where the temperature reaches the highest temperature the latest).

A combustion chamber 9 provided with a burner 8 for burning fuel is installed in the hot air heater main body 1. A heat exchanger 10 is installed at the combustion gas outlet of the combustion chamber 9. This heat exchanger 10
is connected to the exhaust port 12 of the supply/exhaust pipe 11, and discharges the combustion gas heat-exchanged by the heat exchanger 10 outside the hot air heater main body 1 (outdoors).

The air circulation 7-an 13 is configured to take in air from an indoor air suction port 14, pass it through a heat exchanger 10, and send it to a louver (warm air outlet) 15.

Further, a second temperature detection means 16 is installed in the heat exchanger 10 to detect the temperature of the air sent from the air circulation layer pump 13.

Next, the operation of an embodiment of the present invention having the above configuration will be described.

First, during normal operation (when heat storage is not performed), when the burner 8 in the combustion chamber 9 is ignited and combusted by an ignition device (not shown), the combustion chamber 9 and the heat exchanger 10 are gradually heated. It gets hot. When the temperature of the heat exchanger 10 exceeds a predetermined temperature, a signal detected by the second temperature detection means 16 installed in the heat exchanger 10 is sent to a control circuit (not shown) and the air circulation fan 13 is rotated. Air is taken in through an air suction port 14 and heat exchanged with high-temperature combustion gas generated by a burner 8 in a combustion chamber 9 in a heat exchanger 10 to produce warm air, which is sent to a louver (warm air outlet) 15. However, in the case of the above-mentioned normal operation, until the second temperature detection means 16 operates, the 7-amplifier for air circulation is used to prevent cold air from blowing out.
3 is stopped.

During this time, it takes about 3 minutes for the warm air to blow out from the louver (hot air outlet) 15. Therefore, heat storage is performed using a latent heat storage material.

During this heat storage operation, the indoor air taken in from the indoor air intake port 14 by the air circulation fan 13 is mixed with the high temperature combustion gas generated by the burner 8 in the combustion chamber 9 and the heat exchanger 10.
heat is exchanged and becomes warm air.

This hot air passes through a hot air circulation path 2 in which a heat storage tank 3 is installed, passes through a louver (hot air outlet) 15, and flows into the room. At this time, the heat of the hot air is supplied to the latent heat storage material 4 filled in the heat storage tank 3 installed in the hot air circulation path 2. This heat heats and melts the latent heat storage material 4 and stores heat in the heat storage tank.

After heat storage is completed, when the operation switch is pressed to use the hot air heater, the burner 8 in the combustion chamber 9 starts combustion. However, K takes time to achieve steady combustion, and since the heat exchanger 10 has a heat capacity, K takes time to blow out hot air.

Therefore, until steady combustion is carried out, the heat storage tank 3 in which the heat has been stored is activated at the same time as the overcooling release means 5 installed on the downstream side of the heat storage tank 3 is pressed when the operation switch of the hot air heater is pressed. The supercooling of the latent heat storage material 4 in the heat storage tank 3 is canceled, and the heat stored in the latent heat storage material 4 is radiated. The first temperature detector 7 installed in the heat storage tank 3 detects the heat radiated by the heat storage tank 3, and this first temperature detector 7 sends a signal to the control circuit. The fan 13 is slightly rotated.

When the air circulation fan 13 rotates slightly, indoor air is taken in from the indoor air suction port 14, and this air passes through the hot air circulation path 2 where the heat storage tank 3 is installed, and then passes through the louver (hot air outlet).
Since hot air generated by the heat radiated by the heat storage tank 3 is blown into the room via the heat exchanger 15, rapid heating is possible until the heat exchanger 10 reaches the set temperature. When the heat exchanger 10 reaches the set temperature, the second temperature detection means 16 detects and sends a signal to the control circuit.
The air circulation fan 13 is returned to steady rotation by the control circuit to perform normal operation, and the heat storage tank 3 is warmed by this warm air, so that a heat storage operation can be performed at the same time.

During strong operation, the latent heat storage material 4 sufficiently reaches the phase change temperature, so as described above, the latent heat storage material 4 becomes supercooled in a short time, so that sufficient heat can be stored. However, during weak operation, the combustion by the burner 8 in the combustion chamber 9 becomes a weak combustion operation, so that the latent heat storage material 4 in the heat storage tank 3 may not reach the phase change temperature. In this case, the hot air heater is operated to store heat in the heat storage tank 3 as shown in the operational mode F-electric heater relationship characteristic diagram of the hot air heater according to the embodiment of the present invention in FIG. During weak combustion operation in which the temperature of the latent heat storage material 4 of the heat storage tank 3 does not reach the phase change temperature, a heat source for heat storage is installed in the latent heat storage material 4 of the heat storage tank 3 at the same time as the operation ends. The electric heater 6 is energized to heat the latent heat storage material 4 to the phase change temperature, and the latent heat storage material 4 is reliably returned to a supercooled state.
Since heat can be stored, the next time you use this hot air heater, it will be possible to heat up quickly when starting up.

Furthermore, when heating the latent heat storage material 4 with the electric heater 6, the latent heat storage material 4 can be controlled at a temperature close to the phase change temperature, so the latent heat storage material 4 is not overheated, and the life of the latent heat storage material 4 can be extended.

Further, as shown in the operational mode-electric heater relationship characteristic diagram of the hot air heater according to an embodiment of the present invention in FIG. 3, the hot air heater is operated to store heat in the heat storage tank 3. During weak combustion operation in which the temperature of the latent heat storage material 4 of the heat storage tank 3 does not reach the phase change temperature, the electric heater 6, which is a heat source for heat storage installed in the latent heat storage material 4 of the heat storage tank 3, is activated at the same time as the operation ends.
The current may be applied for a certain period of time (until the phase change temperature is reached). In this case, since it can be controlled by a timer or the like, heat storage operation during weak combustion operation can be performed with a simple configuration.

Next, in the case where the operation of the hot air heater of the present invention is stopped in the middle of startup, the operation when stopping the operation of the hot air heater according to an embodiment of the present invention in the middle of startup is shown in Fig. 4. Mode-
As shown in the electric heater related characteristic diagram, the electric heater 6, which is a heat source for heat storage installed in the latent heat storage material 4 of the heat storage tank 3, is used for the same period of time from the start of heating operation until the operation is stopped during startup. By energizing it, heat can be stored reliably. Further, even in this case, the electric heater 6 may be energized for a certain period of time.

FIG. 5 is an operation mode-electric heater relationship characteristic diagram of control by the first temperature detection means of the hot air heater according to an embodiment of the present invention. As shown in the figure, when the hot air heater is operated to store heat in the heat storage tank 3 and the temperature of the latent heat storage material 4 in the heat storage tank 3 does not reach the phase change temperature, the operation is terminated. At the same time, the electric heater 6, which is a heat source for heat storage installed in the latent heat storage material 4 of the heat storage tank 3, is energized to heat the latent heat storage material 4 to a phase change temperature, and this phase change temperature is converted into the latent heat of the heat storage tank 3. The first temperature detection means 7 is set in the first temperature detection means 7 installed in the heat storage material 4, and when the latent heat storage material 4 reaches the phase change temperature due to heating by the electric heater 6, the first temperature detection means 7 is set.
detects this, and sends this signal to a control circuit (not shown) K, which cuts off the power to the electric heater. By operating in this manner, rapid heating at startup is possible by operation using heat storage. In addition, when the latent heat storage material 4 is heated by the electric heater 6, when the temperature of the latent heat storage material 4 reaches the phase change temperature, the first temperature detection means 7 cuts off the electricity to the electric heater, so that the latent heat storage material 4 is overheated. Therefore, the life of the latent heat storage material 4 can be extended.

FIG. 6 is a characteristic diagram showing the relationship between the operating mode and the electric heater when heat is radiated and when heat is not radiated in the hot air heater according to an embodiment of the present invention. When the heat is radiated, the supercooling release means 5 installed on the downstream side of the heat storage N3 is activated at the same time as the operation switch of the hot air heater is pressed, and the latent heat storage material 4 in the heat storage tank 3 is released from supercooling. The heat stored in the latent heat storage material 4 is radiated.

The first temperature detector 7 installed in the heat storage tank 3 detects the heat radiated by the heat storage tank 3, and this first temperature detector 7 sends a signal to the control circuit. The fan 13 is slightly rotated.

When the air circulation fan 13 rotates slightly, indoor air is taken in from the indoor air intake port 14, and this air is transferred to the heat storage tank 3.
The warm air generated by the heat radiated by the heat storage tank 3 is blown into the room through the hot air circulation path 2 where the heat exchanger 10 reaches the set temperature via the looper (warm air outlet) 15. becomes possible. When the heat exchanger 10 reaches the set temperature, the second temperature detection means 16 detects it and sends a signal to the control circuit, which allows the air circulation fan 13 to return to steady rotation and perform normal operation. However, there may be a case where heat is not radiated from the heat storage tank 3 due to heat storage not being performed or the like even though the supercooling release means 5 is desired to operate. In this case, the air circulation fan 13 is kept stopped and no air is blown, and the second temperature detection means 16 detects that the heat exchanger 10 has been heated by the burner 8 and has reached the set temperature. At the same time as the air circulation fan 13 is stopped until the second temperature detection means 16 detects the set temperature,
The air circulation fan 13 is rotated steadily to perform normal heating operation.

By performing the above operation, the louver (warm air outlet) 1
It is possible to prevent cold air from blowing out from 5.

〔Effect of the invention〕

According to the present invention, an electric heater, which is a heat source for heat storage, is provided in the latent heat storage material in the heat storage tank, and the electric heater is time-controlled by a temperature detection means or a timer. The temperature deficiency can be compensated for by the electric heater, and the latent heat storage material can be reliably returned to the supercooled state aK. Therefore, heat can be stored reliably, and heating can be started quickly due to this heat storage.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a hot air heater according to an embodiment of the present invention, and FIGS. 2 and 3 are operational mode-electric heater relationship characteristic diagrams of the hot air heater according to an embodiment of the present invention. , FIG. 4 is a characteristic diagram of the operation mode-electric heater relationship when the warm air heater according to an embodiment of the present invention is stopped during startup,
FIG. 5 is an operation mode-electric heater relationship characteristic diagram of the control by the first temperature detection means of the hot air heater according to an embodiment of the present invention, and FIG. 6 is a hot air heater according to an embodiment of the present invention. FIG. 4 is a characteristic diagram of the relationship between the operating mode and the electric heater when the heat is radiated and when the heat is not radiated. 1... Warm air heater body, 2... Hot air circulation path, 3... Heat storage tank, 4... Latent heat storage material, 5... Supercooling release means 1, 6... Electric heater, 7...First temperature detection means, 13...Air circulation fan, 16...Second temperature detection means 0 Agent Patent attorney Noriyuki Chika Yudo Hiromei Uji/Figure No. z A hot singlet 4! -) (Cane heats up “Two Provisions”) 1st Vision

Claims (6)

[Claims] (1) A heat storage tank filled with a latent heat storage material having a stable supercooled state, a supercooling release means for releasing the supercooled state of the latent heat storage material installed in the heat storage tank, and a supercooling release means installed in the heat storage tank. A hot air heater characterized in that an electric heater as a heat storage heat source is installed in a hot air circulation path of the hot air heater. (2) The hot air heater according to claim 1, wherein the electric heater of the thermal storage heat source installed in the heat storage tank is energized when the hot air heater is stopped. (3) The hot air heater according to claim 1, wherein when the operation of the hot air heater is stopped during start-up operation, the electric heater is energized for only the time it has been in operation. (4) The hot air heater according to claim 1, wherein the electric heater is energized for a certain period of time. (5) The hot air heater according to claim 1, wherein when the temperature of the heat storage tank reaches the melting temperature, power supply to the electric heater is stopped. (6) A patent claim characterized in that when the temperature detecting means installed in the heat storage tank does not reach a set temperature after the operation of the supercooling canceling means, the fan of the hot air heater is stopped and normal operation is started. A warm air heater according to item 1 in the range of .