KR20200084239A - Regenerative midnight boiler system comprising a main boiler and sub boilers - Google Patents

Abstract

The present invention relates to a regenerative midnight boiler system and, more specifically, to a regenerative midnight boiler system comprising a main boiler and a sub-boiler. According to an aspect of the present invention, a method for controlling the operation of a sub-boiler in a regenerative midnight boiler system comprises the steps of: generating information on the amount of heat that can be supplied by a main boiler until a preset shutdown time; generating first heating load information until the shutdown time by using outdoor temperature information; generating expected temperature information of a heat storage tank at the shutdown time by using information on the current temperature of the heat storage tank, information on the amount of heat that can be supplied, and the first heating load information; and controlling the operation of the sub-boiler by using the expected temperature information. According to the present invention, the regenerative midnight boiler system and the method can efficiently control the sub-boiler, thereby enabling the temperature of water inside the heat storage tank to reach a desired temperature even in cold weather.

Description

Regenerative midnight boiler system comprising a main boiler and sub boilers

The present invention relates to a heat storage type late-night boiler system, and more particularly, to a heat storage type late-night boiler system including a main boiler and an auxiliary boiler.

In general, boilers using oil and gas as heat sources are mainly used for heating in houses. Oil and gas heat sources are expensive and have a problem of polluting the atmosphere due to pollutants generated during combustion. In addition, in the case of gas, there is also a problem causing an explosion accident due to leakage.

Accordingly, in recent years, a heat storage type electric boiler using electricity as a heat source has been widely used. The heat storage electric boiler heats the water inside the heat storage tank by using the power of the middle of the night with low power consumption to provide heating and hot water.

The heat storage type electric boiler has the advantage of low maintenance cost because it uses the power of the middle of the night, but it has the disadvantage that the heat storage tank installed outdoors is affected by the outdoor temperature. That is, in the case of the cold weather when the outdoor temperature is very low, there is a problem in that the temperature of the water inside the heat storage tank does not reach a desired temperature, thereby deteriorating the performance of providing heating and hot water.

The technical problem to be achieved by the technical idea of the present invention is to provide a heat storage type late-night boiler system capable of efficiently controlling the auxiliary boiler to reach the desired temperature of the water inside the heat storage tank even in cold weather.

According to an aspect of the present invention, in the method of controlling the operation of the auxiliary boiler in the heat storage type late-night boiler system including the main boiler and the auxiliary boiler, generating the available heat quantity information of the main boiler up to a preset operation end time ; Generating first heating load information up to the end time of the operation using the outdoor temperature information; Generating expected temperature information of the heat storage tank at the end of the operation using current heat storage tank temperature information, the available heat capacity information, and the first heating load information; And controlling the operation of the auxiliary boiler by using the predicted temperature information.

According to an embodiment, the operation control method of the auxiliary boiler may include generating second heating load information corresponding to 24 hours using the outdoor temperature information: and the supplyable heat quantity information and the second heating load information. Generating the total calorie information using; further comprising, the step of controlling the operation of the auxiliary boiler, may be a step of controlling the operation of the auxiliary boiler using the total heat information and the expected temperature information .

According to an embodiment, the step of controlling the operation of the auxiliary boiler may include: generating information about a set temperature and information about a predicted temperature difference using the estimated temperature information; And controlling the operation of the auxiliary boiler using the estimated temperature difference information and the total calorie information.

According to an embodiment, the operation control method of the auxiliary boiler may further include generating weight information according to a preset method using the outdoor temperature information, wherein controlling the operation of the auxiliary boiler comprises: the weight It may be a step of controlling the operation of the auxiliary boiler by using information, the estimated temperature difference information, and the total calorie information.

According to an embodiment, the weight information may be generated by the following equation.

α = (TA * -1)/25 * 5

However, the α is the weight information, and the TA is the outdoor temperature information.

According to an embodiment, the step of controlling the operation of the auxiliary boiler may include: reading control information corresponding to the weight information, the expected temperature difference information, and the total calorie information from a pre-stored look-up table; And controlling the operation of the auxiliary boiler using the control information.

According to another embodiment of the present invention, when the operation start time arrives, a main boiler control signal is generated and transmitted, and information on the available heat of the main boiler from the operation start time to a preset operation end time is generated, and the operation is started. Using the outdoor temperature information corresponding to the start time, first heating load information up to the end of operation is generated, current storage tank temperature information corresponding to the operation start time, the supplyable heat amount information, and the first heating load information A controller for generating predicted temperature information of the heat storage tank at the end of operation, and generating an auxiliary boiler control signal using the predicted temperature information; A main boiler that starts or ends operation according to the main boiler control signal; And an auxiliary boiler that starts or ends operation according to the auxiliary boiler control signal.

According to an embodiment, the controller generates second heating load information corresponding to 24 hours using the outdoor temperature information, and generates total calorie information using the supplyable calorie information and the second heating load information. In addition, the auxiliary boiler control signal may be generated by using the total calorie information and the expected temperature information.

According to an embodiment, the controller may generate predicted temperature difference information using information on a set temperature and the predicted temperature information, and generate the auxiliary boiler control signal using the predicted temperature difference information and the total calorie information. have.

According to an embodiment, the controller generates weight information according to a preset method using the outdoor temperature information, and generates the auxiliary boiler control signal using the weight information, the expected temperature difference information, and the total calorie information. can do.

According to an embodiment, the weight information may be generated by the following equation.

α = (TA * -1)/25 * 5

However, the α is the weight information, and the TA is the outdoor temperature information.

According to an embodiment, the controller reads control information corresponding to the weight information, the expected temperature difference information, and the total calorie information from a pre-stored look-up table, and generates the auxiliary boiler control signal using the control information. can do.

The heat storage type late-night boiler system according to the technical idea of the present invention can efficiently control the auxiliary boiler to reach the desired temperature of the water in the heat storage tank even in cold weather.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the present invention, a brief description of each drawing is provided.
1 is a block diagram of a heat storage type late-night boiler system according to an embodiment of the present invention.
Figure 2 is a flow chart for a control method of a thermal storage late-night boiler system according to an embodiment of the present invention.
3 is a view illustrating a look-up table for controlling the operation of the auxiliary boiler according to an embodiment of the present invention.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail through detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the present invention, when it is determined that detailed descriptions of related known technologies may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof will be omitted. In addition, the numbers used in the description process of the present specification (for example, first, second, etc.) are only identification numbers for distinguishing one component from other components.

In addition, in the present specification, when one component is referred to as “connected” or “connected” with another component, the one component may be directly connected to the other component, or may be directly connected. It should be understood that, as long as there is no objection to the contrary, it may or may be connected via another component in the middle.

In addition, terms such as “~ unit”, “~ group”, “~ character”, and “~ module” described in the present specification mean units that process at least one function or operation, which is hardware or software or hardware and It can be implemented with a combination of software.

In addition, it is intended to clarify that the division of the components in this specification is only classified by the main functions of each component. That is, two or more components to be described below may be combined into one component, or one component may be divided into two or more for each subdivided function. In addition, each of the constituent parts to be described below may additionally perform some or all of the functions of other constituent parts in addition to the main functions of the constituent parts, and some of the main functions of the constituent parts are different. Needless to say, it may also be carried out in a dedicated manner.

Hereinafter, embodiments of the present invention will be described in detail.

1 is a block diagram of a heat storage type late-night boiler system according to an embodiment of the present invention.

Referring to FIG. 1, the heat storage type late-night boiler system 100 according to an embodiment of the present invention may include a controller 110, a heat storage tank 120, a main boiler 130, and an auxiliary boiler 140.

The heat storage type late-night boiler system 100 heats the water inside the heat storage tank 120 to the user by using electric power for a preset late-night electricity use time (for example, 10 pm to 8 am the next day, for a total of 10 hours). Heating and hot water can be provided. Each of the controller 110, the main boiler 130, and the auxiliary boiler 140 may be electrically connected to each other through wired or wireless communication to transmit and receive various signals.

The main boiler 130 may be operated at midnight electricity use time under the control of the controller 110 to heat the temperature of the water inside the heat storage tank 120. The main boiler 130 may be a heat pump boiler.

The auxiliary boiler 130 is operated at a preset late-night electricity use time under the control of the controller 110 to heat the temperature of the water inside the heat storage tank 120 (with the main boiler 130. In this case, the auxiliary boiler 130 ) May be a heat pump boiler cascaded with the main boiler 130. Alternatively, the auxiliary boiler 130 may be operated at a preset late-night electricity use time under the control of the controller 110, and the ambient air of the heat storage tank 120 In this case, the auxiliary boiler 130 may be an electric heater.

The controller 110 may control start and stop of the main boiler 130 and/or the auxiliary boiler 140. For example, the controller 110 receives a control signal for starting the operation of the main boiler 130 when the late night electricity use start time (for example, 10 pm) (hereinafter referred to as'operation start time') arrives. It can be generated and transmitted to the main boiler 130. The main boiler 130 may start operating when the control signal is received to increase the temperature of the water inside the heat storage tank 120. In addition, the controller 110, when the end of late night electricity use (for example, 8 am) has arrived, or the temperature of the water inside the heat storage tank 120 reaches a set temperature (for example, 80 degrees Celsius), the main boiler ( A control signal for terminating the operation of 130 may be generated and transmitted to the main boiler 130. The main boiler 130 can be shut down when the control signal is received.

In addition, the controller 110 when the late night electricity use start time (for example, 10 pm) arrives, the temperature of the water inside the heat storage tank 120 set by the user only by the operation of the main boiler 130 (hereinafter referred to as "set temperature") It may be determined whether it is reachable, and may generate a control signal for starting or shutting down the auxiliary boiler 140 according to the determination result. The auxiliary boiler 140 may start or end the operation when the control signal is received.

Hereinafter, an operation in which the controller 110 controls the operation of the auxiliary boiler 140 will be described in detail with reference to FIG. 2.

2 is a flow chart for a method for controlling the operation of an auxiliary boiler in a thermal storage late-night boiler system according to an embodiment of the present invention.

In step S210, the controller 110 uses the information about the outdoor temperature around the heat storage tank 120 (hereinafter referred to as “outdoor temperature information”) to determine the amount of heat the main boiler 130 can supply to the heat storage tank for a preset time. Information (hereinafter referred to as'supplied calorie information') can be generated.

For example, the controller 110 may generate supplyable calorie information according to Equation 1 below.

[Equation 1]

Supplyable calorie information = (performance information * 0.75) * midnight electricity supply time;

Here, the performance information is information about the amount of heat that the main boiler 130 can supply for one hour, and may be information stored in advance in the controller 110.

Further, 0.75 may be a preset value in consideration of heat loss.

In addition, the midnight electricity supply time is information on the time at which midnight electricity is supplied, and may be, for example, 10 [hr].

** The content that differs from the formula for generating supplyable calorific information according to the current outdoor temperature is considered to be an experimental formula, so it was omitted because it would be better to keep it with know-how.

In step S220, the controller 110 uses the information about the outdoor temperature around the heat storage tank 120 (hereinafter, referred to as'outdoor temperature information') to provide information on the amount of heat of the heating load up to the preset end time (hereinafter referred to as'outdoor temperature information'). , May be referred to as'first heating load information'.

For example, it is assumed that the heat transfer area where heating is provided is 180 [m2], the loss coefficient of heat provided is 0.8 [W/m 2 *K], and the indoor setting temperature set by the user is 25 [℃]. do. In this case, the controller 110 may generate first heating load information according to Equation 2 below.

[Equation 2]

1st heating load information = [(180*0.8*(25-TA)*1.2)/1000[kW]*operation end time[hr];

Here, TA may be outdoor temperature information.

In step S230, the controller 110 uses the available heat quantity information, the first heating load information, and information about the temperature of the water inside the current heat storage tank 120 (hereinafter referred to as'current heat storage tank temperature information') and a preset time elapses. After that, it is possible to generate information (hereinafter referred to as'expected temperature information') that predicts the temperature of the water inside the heat storage tank 120.

For example, a sensor capable of sensing the temperature of the internal water may be formed in the heat storage tank 120, and information (ie, current heat storage temperature information) measured by the sensor may be transmitted to the controller 110. Also, the controller 110 may generate expected temperature information according to Equation 3 below.

[Equation 3]

Estimated temperature information [℃]=([Supplyable calorie information-first heating load information]*3600/heat capacity*loss rate)+current storage tank temperature information;

The heat capacity is the heat capacity of the water (C=Cp*m≒11,090[kJ/k]) (static pressure specific heat about 4.1[kJ/kg*K], the amount of water inside the heat storage tank 120 2700[L]), and the loss rate is the amount of heat that can be supplied It may be information about the loss rate of heat (for example, '0.98', 2% loss) when the temperature of water increases. It is obvious that 1 [kwh] is 3600 [kJ].

In step S240, the controller 110 may generate information (hereinafter, referred to as'second heating load information') for the heat amount of the heating load for 24 hours using the outdoor temperature information. For example, it is assumed that the heat transfer area where heating is provided is 180 [m2], the loss coefficient of heat provided is 0.8 [W/m 2 *K], and the indoor setting temperature set by the user is 25 [℃]. do. In this case, the controller 110 may generate second heating load information according to Equation 4 below.

Equation 4]

2nd heating load information = [(180*0.8*(25-TA)*1.2)/1000[kW]*10[hr];

Here, TA may be outdoor temperature information.

In step S250, the controller 110 may generate the total heat information (A) according to a preset method using the available heat information and the second heating load information. For example, the controller 110 may generate the total calorie information (A) according to Equation 5 below.

[Equation 5]

Comprehensive calorie information (A) = Supplyable calorie information-second heating load information;

In step S260, the controller 110 may generate the predicted temperature difference information B using the set temperature information and the predicted temperature information. For example, the controller 110 may generate the predicted temperature difference information B according to Equation 6 below.

[Equation 6]

Expected temperature difference information (B) = set temperature information-expected temperature information;

In step S270, the controller 110 may generate the weight information α according to a preset method using the outdoor temperature information. For example, the controller 110 may generate weight information α according to Equation 7 below.

[Formula 7]

Weight information (α)=(TA*-1)/25*5;

Here, TA may be outdoor temperature information.

According to Equation 7 above, it can be seen that when the outdoor temperature is 30 degrees Celsius, the weight information is '6'.

In step S280, the controller 110 may generate a boiler control signal using the total calorie information (A), the expected temperature difference information (B) and the weight information (α), and then transmit it to the auxiliary boiler 140.

For example, the controller 110 may read control information corresponding to the weight information, the predicted temperature difference information, and/or the total calorie information from the pre-stored lookup table. Hereinafter, an operation in which the controller 110 reads control information with reference to the lookup table will be described in detail with reference to FIG. 3.

3 is a view illustrating a look-up table for controlling the operation of the auxiliary boiler according to an embodiment of the present invention.

3, a look-up table according to an embodiment of the present invention is illustrated. The controller 110 may have a lookup table stored in advance. Accordingly, the controller 110 may read control information corresponding to weight information, expected temperature difference information, and/or total calorie information.

Referring to the example of FIG. 3, when the total calorie information (A) is 50 or more and the predicted temperature difference information (B) is 10 or less, the controller 110 may read control information corresponding to “secondary boiler OFF”. .

In addition, when the total heat information (A) is 50 or more, and the predicted temperature difference information (B) is more than 10, the controller 110 says, "When the temperature of the water in the heat storage tank reaches the '55°C + weight information' Control information for "to ON".

In addition, when the total heat information (A) is less than 50 and is greater than or equal to 25 and the predicted temperature difference information (B) is less than or equal to 10, the controller 110 says, “The temperature of the water inside the heat storage tank in the heat storage tank reaches '60°C + weighted information'. Control information for "ON" until readout can be read.

As described above, the controller 110 may read control information using a pre-stored lookup table and generate an auxiliary boiler control signal using the read control information. In addition, the controller 110 may control the operation or stop of the auxiliary boiler 140 by transmitting the auxiliary boiler control signal to the auxiliary boiler 140.

For example, when the control information corresponds to “secondary boiler OFF”, the controller 110 may not generate an auxiliary boiler control signal.

As another example, if the control information corresponds to "ON until the temperature of the water inside the heat storage tank reaches '60 degrees + weight information' in the auxiliary boiler, the controller 110 immediately starts the auxiliary boiler 140 To generate an auxiliary boiler control signal can be sent to the auxiliary boiler 140. Thereafter, the controller 110 generates an auxiliary boiler control signal for stopping the operation of the auxiliary boiler 140 and transmits it to the auxiliary boiler 140 when the temperature of the water inside the heat storage tank 120 reaches '60°C + weighted information'. Can.

As described above, the heat storage type late-night boiler system 100 according to an embodiment of the present invention can efficiently control the operation of the auxiliary boiler according to the outdoor temperature to reach the desired temperature of the water inside the heat storage tank even in the cold weather. Thus, the heat storage type late-night boiler system 100 according to an embodiment of the present invention will always enjoy the heating effect desired by the user with the lowest maintenance cost.

As described above, the present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications and changes are made by those skilled in the art within the technical spirit and scope of the present invention. This is possible.

100: Regenerative late-night boiler system
110: controller
120: heat storage tank
130: main boiler
140: auxiliary boiler

Claims (12)

In the method of controlling the operation of the auxiliary boiler in the heat storage late-night boiler system including a main boiler and an auxiliary boiler,
Generating supplyable calorific information of the main boiler up to a preset operation end time;
Generating first heating load information up to the end of operation time using outdoor temperature information;
Generating estimated temperature information of the heat storage tank at the end of the operation using current heat storage tank temperature information, the available heat capacity information, and the first heating load information; And
Controlling the operation of the auxiliary boiler using the expected temperature information;
Operation control method of the auxiliary boiler comprising a.
According to claim 1,
Generating second heating load information corresponding to 24 hours using the outdoor temperature information: and
Generating total heat information using the supplyable heat information and the second heating load information;
Including more,
Controlling the operation of the auxiliary boiler,
Controlling the operation of the auxiliary boiler by using the total heat information and the expected temperature information, the operation control method of the auxiliary boiler.
According to claim 2,
Controlling the operation of the auxiliary boiler,
Generating predicted temperature difference information using the information on the set temperature and the estimated temperature information; And
Controlling the operation of the auxiliary boiler using the predicted temperature difference information and the total calorie information;
Including, the operation control method of the auxiliary boiler.
According to claim 3,
Generating weight information according to a preset method using the outdoor temperature information;
Including more,
Controlling the operation of the auxiliary boiler,
Controlling the operation of the auxiliary boiler by using the weight information, the predicted temperature difference information, and the total calorie information, the operation control method of the auxiliary boiler.
According to claim 4,
The weight information is generated by the following formula, the operation control method of the auxiliary boiler.
α = (TA * -1)/25 * 5
However, the α is the weight information,
The TA is the outdoor temperature information.
According to claim 4,
Controlling the operation of the auxiliary boiler,
Reading control information corresponding to the weight information, the expected temperature difference information, and the total calorie information from a pre-stored look-up table; And
Controlling the operation of the auxiliary boiler using the control information;
Including, the operation control method of the auxiliary boiler.
When the operation start time arrives, a main boiler control signal is generated and transmitted, and information on the available heat of the main boiler from the operation start time to a preset operation end time is generated, and outdoor temperature information corresponding to the operation start time is generated. To generate the first heating load information up to the end of operation time, and using the current heat storage tank temperature information corresponding to the start time, the available heat capacity information, and the first heating load information to store the heat storage tank at the end of operation time. A controller that generates the predicted temperature information of and generates an auxiliary boiler control signal using the predicted temperature information;
A main boiler that starts or ends operation according to the main boiler control signal; And
An auxiliary boiler that starts or ends operation according to the auxiliary boiler control signal;
Regenerative late-night boiler system comprising a.
The method of claim 7,
The controller,
Generates second heating load information corresponding to 24 hours using the outdoor temperature information, generates total calorie information using the supplyable calorie information and the second heating load information, and generates the total calorie information and the prediction A heat storage type late-night boiler system that generates the auxiliary boiler control signal using temperature information.
The method of claim 8,
The controller,
A heat storage type late-night boiler system that generates predicted temperature difference information using information on a set temperature and the predicted temperature information, and generates the auxiliary boiler control signal using the predicted temperature difference information and the total calorie information.
The method of claim 9,
The controller,
A heat storage type late-night boiler system that generates weight information according to a preset method using the outdoor temperature information, and generates the auxiliary boiler control signal using the weight information, the predicted temperature difference information, and the total calorie information.
The method of claim 10,
The weight information is generated by the following formula, a heat storage type late-night boiler system.
α = (TA * -1)/25 * 5
However, the α is the weight information,
The TA is the outdoor temperature information.
The method of claim 10,
The controller,
A pre-stored look-up table, the weight information, the expected temperature difference information and read the control information corresponding to the total calorie information, and using the control information to generate the auxiliary boiler control signal, a thermal storage type late-night boiler system.

Images