CN107388592B - Electric heating through boiler and dynamic temperature control method thereof - Google Patents
Electric heating through boiler and dynamic temperature control method thereof Download PDFInfo
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- CN107388592B CN107388592B CN201710729348.8A CN201710729348A CN107388592B CN 107388592 B CN107388592 B CN 107388592B CN 201710729348 A CN201710729348 A CN 201710729348A CN 107388592 B CN107388592 B CN 107388592B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
Abstract
The invention relates to an electric heating ventilation boiler and a dynamic temperature control method thereof, and belongs to the technical field of building electric heating equipment. This electric heating leads to boiler includes: the heating pipe group comprises a plurality of mutually independent electric heating pipes, the electric heating pipes heat circulating heat medium, and the heat medium is heated by the electric heating pipes and transports heat energy; the relay group comprises a plurality of relays, and each relay is correspondingly and electrically connected with the corresponding electric heating pipe and controls the corresponding electric heating pipe to be switched on or switched off; a first sensor that measures an outdoor ambient temperature; a second sensor that measures a real-time temperature of the heated heat medium; and the controller is used for setting a temperature control threshold value of the heat medium according to the outdoor environment temperature, and controlling the input quantity of the electric heating pipes according to the real-time temperature of the heat medium so as to adjust the heating speed of the heat medium. The device and the method can dynamically adjust the temperature of the heating medium of the heating boiler according to the outdoor temperature, and reduce the condition that the indoor temperature changes along with the outdoor temperature.
Description
Technical Field
The invention relates to an electric heating ventilation boiler and a dynamic temperature control method thereof, and belongs to the technical field of building electric heating equipment.
Background
An electric heating and ventilating boiler, also called an electric heating furnace, an electric heating boiler or an electric water heating boiler, is a heating device which converts electric energy into heat energy, circulates in a heating pipeline through heat media (water, oil and the like, hereinafter referred to as media) and heats indoor air to meet heating requirements, and the electric power is varied from thousands of watts to hundreds of kilowatts.
The traditional electric heating boiler generally uses a mechanical relay to uniformly control the current on-off of an electric heating pipe. The mechanical relay has the problems of slow switching action, high noise, frequent action, easy damage and the like, and has high failure rate when used for controlling the electric heating and communicating boiler; and the mechanical relay is used, and the switching noise is high, so that the rest of a user is influenced particularly at quiet night.
In addition, since the common electric warming device adopts a mode of uniformly controlling on and off, as shown in fig. 7, the controller selects the temperature control threshold value of the medium according to the set indoor temperature, wherein the temperature control threshold value comprises a set upper line and a set lower limit value of the temperature; when the temperature does not reach the set high temperature, putting all the electric heating pipes into the furnace for heating; and when the temperature reaches the set high temperature, closing all the electric heating pipes to release heat. The simple control method does not consider various influence factors influencing the heating effect, such as: the heat utilization rate is low due to the influence of a plurality of factors such as the heat preservation effect of the building, the heat preservation effect of the pipeline heat preservation layer, the loss of circulating media, the outdoor environment temperature and the like.
In addition, since the conventional electric heating and ventilating boiler has the controlled high temperature point and the controlled low temperature point set, the high temperature point and the low temperature point are kept unchanged during the whole heating period. When the outdoor environment temperature changes, the building indoor temperature will fluctuate greatly, which causes the energy consumption of the device to increase and easily causes the problems of uncomfortable feeling of the indoor human body and the like. Such as: the outdoor ambient temperature is assumed to be 0 deg.c, while the electric heating pipe is turned off or on assuming that the heat medium is at 50 deg.c and 44 deg.c, respectively, when the indoor temperature is heated to 20 deg.c by the heat medium. When the outdoor environment temperature is increased to 10 ℃, the heat radiated to the environment is reduced due to the reduction of the temperature difference between the indoor temperature and the outdoor environment temperature, and the indoor temperature can reach 23 ℃ or even higher by setting the closing or starting of the electric heating pipe at 50 ℃ and 44 ℃ as usual; when the outdoor ambient temperature is reduced, the opposite is true, so that the indoor temperature changes with the outdoor temperature.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide an apparatus and method for dynamically adjusting the temperature of a heating medium of a heating boiler according to an outdoor temperature, which can reduce the variation of an indoor temperature with the outdoor temperature.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention discloses an electric heating and ventilation boiler, which comprises:
the heating pipe group comprises a plurality of mutually independent electric heating pipes, the electric heating pipes heat circulating heat medium, and the heat medium is heated by the electric heating pipes and transports heat energy;
the relay group comprises a plurality of relays, and each relay is correspondingly and electrically connected with the corresponding electric heating pipe and controls the corresponding electric heating pipe to be switched on or switched off;
a first sensor for measuring an outdoor ambient temperature;
a second sensor for measuring a real-time temperature of the heated heat medium;
the controller can set the temperature control threshold of the heat medium according to the outdoor environment temperature, and the controller can also control the input quantity of the electric heating pipes according to the real-time temperature of the heat medium so as to adjust the heating speed of the heat medium.
In the structure, the controller can detect the outdoor temperature through the first sensor, so that the controller can be adopted to dynamically adjust the temperature of the heat medium, the influence of the outdoor environment temperature on the indoor temperature is reduced, and in addition, the second sensor directly acts on the heated heat medium instead of measuring the environment temperature, so that the agility in temperature feedback is improved, and the fluctuation of the indoor temperature is further reduced.
As a preferred additional feature, the relay is a solid state relay. The solid-state relay can be switched on and off rapidly, and the relay can be switched on and off more frequently to perform accurate temperature rise control. Because the control algorithm designed by the patent needs to frequently adjust the energy-saving heating curve of the heat medium, the mechanical relay is easy to damage if the mechanical relay is used. The solid-state relay is free of noise when opened and closed, and noise caused by a rapid and frequent channel of the relay is reduced.
The preferable additional characteristic is that the electric heating pipe of the heating pipe group is correspondingly and electrically connected with the relay of the relay group, the input ends of the relays are commonly connected with the switch, and the switch is electrically connected to the power supply through the controller; the control ends of the relays are respectively electrically connected with the controller. Because the electric heating pipe loop is conducted after the solid-state relay is broken down, the equipment can have larger current and easily cause accidents in the running stop state, and therefore the relay is protected by adopting the switch.
The switch is characterized in that a release is arranged on the switch, and a control end of the release is electrically connected to the controller; the controller is a PLC. The solid-state relay is further protected by the aid of the release, environment monitoring is carried out through the PLC monitoring device, the control device with the structure is simplified, and high-current control and automation of the device are achieved.
The preferable additional characteristic is that the device also comprises a mutual inductor group, the mutual inductor group comprises a plurality of mutual inductors, each mutual inductor is correspondingly and electrically connected with the electric heating pipe, and the heating pipe group is electrically connected back to the power supply through the mutual inductor group. The mutual inductor group is connected with the main power input end (R, S, T three-phase) of the equipment, the total current change of the equipment can be measured, and the heating tube group or the solid-state relay with faults can be judged according to the change value so as to protect the equipment.
The invention also discloses a dynamic temperature control method of the electric heating ventilation boiler, which comprises the following steps:
step 1: measuring the outdoor environment temperature and measuring the real-time temperature of a heated heat medium for exchanging heat with indoor air;
step 2: the controller selects a preset temperature control threshold value of the heat medium according to the temperature of the heat medium set by a user and the outdoor environment temperature;
and step 3: the controller selects a preset energy-saving temperature-rising curve of the heat medium according to the outdoor environment temperature, and adjusts the heating power of the electric heating pipe for heating the heat medium according to the energy-saving temperature-rising curve and the real-time temperature of the heat medium.
In the method, the purpose of measuring the outdoor temperature is as follows: according to the outdoor temperature, the controller can adjust the temperature of the heat medium, such as: when the requirement value of a user on the environment temperature is 20 ℃, when the outdoor temperature is 0 ℃, the controller sets the temperature of the heat medium to be 44-50 ℃, closes the electric heating pipe when the temperature is 50 ℃, and opens part or all of the electric heating pipes when the temperature is 44 ℃; when the outdoor temperature is 10 ℃, the controller sets the temperature of the heat medium to be 40-45 ℃. In addition, since the temperature of the heat medium immediately after being heated is directly measured, the accuracy and efficiency of temperature feedback can be improved.
As a preferable additional feature, in the step 2, the indoor temperature set by the user has the same change direction with the temperature control threshold of the heat medium, and the outdoor environment temperature has the opposite change direction with the temperature control threshold of the heat medium; in the step 3, the change direction of the outdoor environment temperature is opposite to the change direction of the input quantity of the electric heating pipes. Utilize the big faster principle of heat release speed that the temperature difference is big more, this scheme reduces indoor heat loss speed through the mode that reduces the difference in temperature, and then reduces the heat of electric heating pipe output.
The preferable additional characteristic is that the heat medium is heated by a plurality of independent electric heating pipes respectively, and the heating power is changed by adjusting the input quantity of the electric heating pipes; when the temperature of the heat medium reaches the temperature control threshold, the heating period of the electric heating pipe is T, and the input quantity formula of the electric heating pipe in the next period T is as follows:
in the formula:
when the temperature of the heat medium reaches the first heating period after the temperature control threshold value,
and
are respectively a set value and a set value,
the set value of (a) is generally half of the number of all the electric heating tubes,
the theoretical temperature difference change value is the theoretical temperature difference change value under the condition that half of the number of the electric heating pipes are added.
In the above formula, the first and second light sources are,
and
the number of the electric heating pipes in two periods before the heating period is determined by comparing the heating number and the temperature change with the expected temperature and the change of the previous temperature difference, so that the accuracy of temperature control is improved, an energy-saving heating curve is optimized, and energy conservation is realized;
、
、
、
for the controller to record or calculate, and
the corresponding numerical value preset in the controller is determined according to outdoor environment temperature detection and current heat medium temperature value memorability, such as: the outdoor environment temperature is 0 ℃, the temperature of the current heat medium is 43 ℃, and then the temperature is selected
At 0.5 or 0.7 ℃.
As a preferred additional feature, if
If the number is not an integer, the input time of one electric heating tube is as follows:
t=x*10%*T；
in the formula:
x is
The fractional part of the numerical value. Such as:
at 5.3, x = 3.
As a preferred additional feature, the controller presets an energy-saving temperature-raising curve according to the current outdoor ambient temperature, wherein the energy-saving temperature-raising curve includes a plurality of heating cycles, and the energy-saving temperature-raising curve conforms to the following law:
in the formula:
The heat dissipation constant is determined according to a plurality of factors causing indoor heat dissipation, such as indoor area, outer wall structure, ventilation condition and the like, of the electric heating boiler; the constants can be obtained through limited tests according to different indoor environments or regional environments.
The invention has the beneficial effects that:
1. the device and the method can dynamically adjust the temperature of the heating medium of the heating boiler according to the outdoor temperature, and reduce the condition that the indoor temperature changes along with the outdoor temperature; the influence of outdoor environment temperature is fully considered, the temperature of the heat medium is dynamically adjusted, temperature fluctuation is reduced, and indoor comfort is improved.
2. In addition, because the solid-state relay is adopted, compared with a mechanical relay, the electric heating ventilation boiler has the characteristics of high switching speed, silence, long service life and the like, the long-time normal use of the electric heating ventilation boiler is guaranteed, the failure rate is low, and the continuity of heating is guaranteed.
3. This technique is through the control to electric heating pipe input quantity, and then controls energy-conserving intensification curve, fully considers the influence of outdoor temperature to heating effect influence factor, reduces equipment operation consumption, saves the heating expense.
Drawings
FIG. 1 is a diagram of the connection structure of the components in the electrically warmed general boiler;
FIG. 2 is a logic diagram of temperature control in the present design;
FIG. 3 is a logic diagram of temperature ramp rate control in the present design;
FIG. 4 is a graph of energy saving temperature rise in the present design;
FIG. 5 is a two-stage energy-saving temperature-raising curve diagram in the present design;
FIG. 6 shows the number of electric heating tubes in the design;
fig. 7 is a logic diagram of temperature control of a conventional electric heating and ventilating boiler.
Reference numerals: the method comprises the following steps of 1-a controller, 2-a mutual inductor group, 3-a heating group, 4-a relay group, 5-a switch, 6-a release, 7-a first sensor and 8-a second sensor.
Detailed Description
Example 1
As shown in fig. 1, the electric heating ventilation boiler described in the present invention includes: the heating device comprises a heating group 3, a relay group 4, a first sensor 7, a second sensor 8, a controller 1, a mutual inductor group 2, a switch 5 and a release 6.
The heating pipe group comprises a plurality of mutually independent electric heating pipes, the electric heating pipes heat circulating heat medium, and the heat medium is heated by the electric heating pipes and transports heat energy; the electric heating pipe of the heating pipe set is electrically connected with the corresponding relay of the relay set 4
The relay group 4 comprises a plurality of relays, each relay is a solid-state relay, and each relay is correspondingly and electrically connected with the corresponding electric heating pipe and controls the corresponding electric heating pipe to be switched on or switched off; the input ends of the relays are connected with a switch 5 together; the switch 5 is electrically connected to a power supply through the controller 1, and the control ends of the relays are respectively electrically connected with the controller 1;
the mutual inductor group 2 comprises a plurality of mutual inductors, each mutual inductor is correspondingly and electrically connected with the electric heating pipe, and the heating pipe group 3 is electrically connected back to the power supply through the mutual inductor group 2;
the first sensor 7 is installed outdoors and is used for measuring the outdoor ambient temperature;
the second sensor 8 measures the real-time temperature of the heated heat medium;
the release 6 is arranged on the switch 5, and the control end of the release 6 is electrically connected to the controller 1;
the controller 1 is a PLC controller 1, a temperature control threshold value of the heat medium can be set according to the outdoor environment temperature, and the controller 1 controls the number of the electric heating pipes in a heating state according to the real-time temperature of the heat medium so as to control the temperature rising speed of the heat medium.
Example 2
The invention relates to a dynamic temperature control method of an electric heating ventilation boiler, which comprises the following steps:
step 1: measuring the outdoor environment temperature and measuring the real-time temperature of a heated heat medium for exchanging heat with indoor air;
step 2: the controller selects a preset temperature control threshold value of the heat medium according to the temperature of the heat medium set by a user and the outdoor environment temperature so as to reduce indoor temperature fluctuation;
and step 3: the controller selects a preset energy-saving temperature-rising curve of the heat medium according to the outdoor environment temperature, and adjusts the heating power of the electric heating pipe for heating the heat medium according to the energy-saving temperature-rising curve and the real-time temperature of the heat medium.
In the step 2, the indoor temperature set by the user is the same as the temperature control threshold of the heat medium, and the outdoor environment temperature is opposite to the temperature control threshold of the heat medium; in step 3, the outdoor environment temperature and the temperature rise speed change direction are the same.
Example 3
As shown in fig. 2, based on embodiment 2, the more detailed dynamic temperature control method for an electric heating ventilation boiler of the present invention includes the following steps that a heat medium is heated by a plurality of independent electric heating pipes, respectively:
step 2: the controller 1 acquires the outdoor temperature through the first sensor 7, when the outdoor environment temperature exceeds a set change threshold, the controller 1 resets the temperature control threshold of the heat medium (the medium is abbreviated in the figure) according to the outdoor environment temperature, and the higher the outdoor temperature is, the lower the temperature of the reset heat medium is;
and step 3: when the outdoor ambient temperature does not set the variation threshold, the controller 1 proceeds to the heat medium temperature increasing step.
As shown in fig. 3, the heat medium temperature raising step is as follows:
step 1: the controller 1 selects a preset energy-saving temperature-rising curve according to the outdoor environment temperature;
and 2, step: the controller 1 collects the temperature of the heat medium, and when the real-time temperature of the heat medium is lower than the lower limit value of the temperature control threshold, all electric heating pipes are put into use to heat with the maximum heating power;
and step 3: when the real-time temperature of the heat medium is higher than the lower limit value of the temperature control threshold value, the controller 1 judges whether the heating period T for adjusting the heating rate is reached; if so, judging whether the energy-saving temperature-rising curve of the previous period is the same as the preset energy-saving temperature-rising curve or not, and if so, executing according to the quantity of the electric heating pipes specified by the preset energy-saving temperature-rising curve;
and 4, step 4: if the energy-saving temperature-rising curve of the previous period is different from the preset energy-saving temperature-rising curve, the controller 1 calculates the number of the electric heating pipes to be heated in the next heating period T to adjust the energy-saving temperature-rising curve.
As shown in fig. 3 and 6, when the temperature of the heat medium reaches the temperature control threshold, and the controller rotates the energy-saving heating curve according to the outdoor ambient temperature, the controller calculates the number of heating pipes to be fed in the next heating cycle to control the heating power, and the determination formula of the number of electric heating pipes to be heated in the next heating cycle T is:
in the formula:
When the temperature of the heat medium reaches the first heating period after the temperature control threshold value,
and
are respectively set values, and are respectively a set value,
the set value of (a) is generally half of the number of all the electric heating tubes,
the theoretical temperature difference change value is the theoretical temperature difference change value under the condition that half of the number of the electric heating pipes are added.
In the above formula, if
If the number is not an integer, the input time of one electric heating tube is as follows:
t=x*10%*T；
in the formula: x is
The fractional part of the numerical value.
Example 4
As shown in fig. 4 or 5, in embodiment 3, the energy-saving temperature-increasing curve preset in the controller 1 is related to multiple reasons, such as a building heat-insulating effect, a heat-insulating effect of a pipeline heat-insulating layer, a circulating medium loss, an outdoor environment temperature, and the like, and the energy-saving temperature-increasing curve may be a curve formed by two or more lines; wherein, the line 1 is a heating curve of all the electric heaters, the line 2 is an average energy-saving heating curve in the whole heating period, the line 3 is a preset energy-saving heating curve formed by a plurality of heating periods, and the line is a time limit for stopping the 4-bit energy-saving heating curve; line 2 satisfies the following law:
in the formula:
The above examples are merely examples for clarity of description and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (7)
1. A dynamic temperature control method of an electric heating ventilation boiler is characterized by comprising the following steps:
step 1: measuring the outdoor ambient temperature and measuring the real-time temperature of a heated heat medium for exchanging heat with indoor air;
step 2: the controller selects a preset temperature control threshold value of the heat medium according to the temperature of the heat medium set by a user and the outdoor environment temperature so as to reduce indoor temperature fluctuation;
and step 3: the controller selects a preset energy-saving heating curve of the heat medium according to the outdoor environment temperature, and adjusts the heating power of the electric heating pipe for heating the heat medium according to the energy-saving heating curve and the real-time temperature of the heat medium;
the heating medium is respectively heated by a plurality of independent electric heating pipes, and the heating power is changed by adjusting the input quantity of the electric heating pipes; when the temperature of the heat medium reaches the temperature control threshold, the heating period of the electric heating pipe is T, and the input quantity formula of the electric heating pipe in the next period T is as follows:
in the formula:
the number of electric heating tubes which are put into the previous heating period T;
the number of electric heating tubes which are put into the heating period T;
the temperature change value of the previous heating period T;
the temperature change value of the heating period T is shown;
calculating an expected temperature rise value for the controller according to the difference between the energy-saving temperature rise curve and the real-time temperature of the heat medium; the energy-saving heating curve is one of a plurality of preset energy-saving heating curves selected by the controller according to the current outdoor environment temperature;
when the temperature of the heat medium reaches the first heating period after the temperature control threshold value,
and
are respectively set values; if it is
If the number is not an integer, the input time of one electric heating tube is as follows:
t=x*10%*T；
in the formula: x is
The numerical value of the fractional part of (c);
the controller presets an energy-saving temperature-rising curve according to the current outdoor environment temperature, the energy-saving temperature-rising curve comprises a plurality of heating cycles, and the energy-saving temperature-rising curve conforms to the following rules:
in the formula:
the target temperature to be reached by the heat medium in the next heating period T is obtained;
is the outdoor ambient temperature;
setting a lower limit value of a temperature control threshold value of the heat medium corresponding to the controller at the indoor temperature for a user;
is a heat dissipation constant according to heat transfer between the heat medium and indoor air;
the heat dissipation constant is set according to the indoor ventilation condition;
is a heat dissipation constant set according to the structure of the outer wall.
2. The dynamic temperature control method of an electrically warmed ventilation boiler according to claim 1, wherein in step 2, the indoor temperature set by the user has the same change direction with the temperature control threshold value of the heat medium, and the outdoor environment temperature has the opposite change direction with the temperature control threshold value of the heat medium; in the step 3, the change direction of the outdoor environment temperature is opposite to the change direction of the input quantity of the electric heating pipes.
3. An electric heating ventilation boiler based on the dynamic temperature control method of claim 1 or 2, which is characterized by comprising the following steps: the heating device comprises a heating pipe set, a relay set, a first sensor, a second sensor and the controller; the heating pipe group comprises a plurality of mutually independent electric heating pipes, the electric heating pipes heat circulating heat medium, and the heat medium is heated by the electric heating pipes and transports heat energy; the relay group comprises a plurality of relays, and each relay is correspondingly and electrically connected with the corresponding electric heating pipe and controls the corresponding electric heating pipe to be switched on or switched off; the first sensor is used for measuring the outdoor environment temperature; the second sensor is used for measuring the real-time temperature of the heated heat medium; the controller can set the temperature control threshold of the heat medium according to the outdoor environment temperature, and the controller can also control the input quantity of the electric heating pipes according to the real-time temperature of the heat medium so as to adjust the heating speed of the heat medium.
4. The electric heating ventilation boiler of claim 3, wherein the relay is a solid state relay.
5. The electric heating boiler of claim 4, wherein the electric heating tubes of the heating tube set are correspondingly electrically connected with the relays of the relay set, the input ends of the relays are commonly connected with a switch, and the switch is electrically connected to a power supply through the controller; the control ends of the relays are respectively electrically connected with the controller.
6. The electrically warmed ventilation boiler of claim 5, wherein a release is further provided on the switch, and a control end of the release is electrically connected to the controller; the controller is a PLC.
7. The electrically warmed general boiler of any one of claims 3-6, further comprising a transformer group, wherein the transformer group comprises a plurality of transformers, each transformer is electrically connected with the corresponding electric heating tube, and the heating tube group is electrically connected back to the power source through the transformer group.
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| EP0012007A1 (en) * | 1978-11-30 | 1980-06-11 | Carco Accessories Limited | Automatic temperature compensated boiler thermostat |
| CN2474933Y (en) * | 2001-04-21 | 2002-01-30 | 刘改成 | High efficiency low energy consumption electric heater |
| GB0413304D0 (en) * | 2004-06-15 | 2004-07-14 | Taran Systems Ltd | Heating control system |
| CN201072185Y (en) * | 2007-03-02 | 2008-06-11 | 张广增 | Energy-saving type centralized electric heating machine |
| CN103278022A (en) * | 2013-06-13 | 2013-09-04 | 天津高德恒立科技有限公司 | Control method for heating furnace |
| CN103277835A (en) * | 2013-05-31 | 2013-09-04 | 杭州德联科技有限公司 | Indistinct temperature-control method for multi-room heating system |
-
2017
- 2017-08-23 CN CN201710729348.8A patent/CN107388592B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0012007A1 (en) * | 1978-11-30 | 1980-06-11 | Carco Accessories Limited | Automatic temperature compensated boiler thermostat |
| CN2474933Y (en) * | 2001-04-21 | 2002-01-30 | 刘改成 | High efficiency low energy consumption electric heater |
| GB0413304D0 (en) * | 2004-06-15 | 2004-07-14 | Taran Systems Ltd | Heating control system |
| CN201072185Y (en) * | 2007-03-02 | 2008-06-11 | 张广增 | Energy-saving type centralized electric heating machine |
| CN103277835A (en) * | 2013-05-31 | 2013-09-04 | 杭州德联科技有限公司 | Indistinct temperature-control method for multi-room heating system |
| CN103278022A (en) * | 2013-06-13 | 2013-09-04 | 天津高德恒立科技有限公司 | Control method for heating furnace |
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