TW201339516A - Energy saving control method of electric water heater - Google Patents

Abstract

An energy saving control method of electric water heater is mainly to continuously perform a detection process for detecting the temperature of the hot water storage tank and whether the water is in use. If no, an energy-saving heating process is executed for heating and insulation at a reduced temperature, but if yes, then perform a water use audit. If the accumulated time of actual continuous water consumption is less than a preset length of time, then return to the energy-saving heating process; However, if the accumulated time of actual continuous water consumption is greater than or equal to a preset length of time, then the hot water in the storage tank is subjected to a normal heating insulation process kept within a higher temperature range; therefore, through the above control practices, during a predetermined period of supplying hot water, if the hot water has been in a state of not in use for a long time, then lower the temperature of the hot water in the storage tank, which significantly reduce the frequency of insulation heating to thereby achieve the purpose of energy saving, and when the continuous water use lasts for a long time, hot water can be heated quickly to a normal preset hot water temperature.

Description

Energy-saving control method for electric water heater

The invention relates to an energy-saving heating control performed by an electric water heater during a set hot water supply, in particular, an energy-saving operation for allowing an electric water heater to perform temperature reduction and heat preservation when the electric water heater is idle or short-time water, and when the water is continuously used When the time is long, the electric water heater is subjected to normal heating and heat preservation work, and the supply of hot water at a predetermined temperature is quickly restored.

Generally, an ordinary electric water heater must be used to heat the water in the water storage tank after the power is turned on, and then the hot water of the predetermined temperature can be supplied to the user. This water supply method causes the user to spend Waiting for a long time, and not being able to enjoy the required hot water at any time, although this kind of control can achieve the purpose of saving electricity, but it also causes considerable inconvenience in use; or, after the electric water heater is started, That is, the water in the water storage tank is heated to a preset temperature, and when the water temperature in the water storage tank drops, heating is applied to keep the hot water in a state of being used at the preset temperature, so that Allow users to get the supply of hot water at any time, but it also causes a long time without water, it still has to consume electricity and heat, which causes waste of electrical energy.

Therefore, in order to make the electric water heater more energy-efficient, in particular according to the user's water habits, the user can obtain the required hot water at any time during the peak period of using hot water, so design a multi-stage time-saving energy-saving electric water heater. The control method for supplying hot water is to allow the user to set the electric water heater at a predetermined time period and set the temperature of the hot water required for each time period, for example, the time between AM 05:00 and 08:00 in the morning. At night PM 06:00～09:00, or other time, when the time reaches the above time, the water in the water tank is heated to the preset water temperature, and the temperature is maintained at any time. The user can obtain the hot water supplied by the electric water heater at any time during the preset time period, so that the balance between the hot water demand and the electric energy consumption is achieved.

However, the above-mentioned multi-stage time-saving energy-saving methods can not achieve the goal of truly high energy-saving. The reason is that even if the electric water heater is activated in different time periods, the user does not continue to use water during the period of time. It often happens during this time period, and there may be intermittent use of small amounts of hot water (for example, occasionally turning on the faucet to wash your hands or washing the utensils for a short period of time), or it may be large and continuous at any different time during the time period. Water (for example: single or multi-person continuous bathing), so the status of water has unpredictable variables, so when the water is used for a short time, and there is no water for a long time, the electric water heater must continue to consume electricity and heat. Keeping the hot water in a predetermined higher temperature range, which will cause unnecessary waste of electric energy; in addition, when the relative temperature difference between the external ambient temperature and the hot water temperature in the water storage tank is too large, it is easy to cause The temperature of the hot water in the water storage tank will drop sharply in a short period of time, while the electric water heater will drop in the hot water temperature. After that, the heating is performed to the preset temperature heat preservation operation, so the heat preservation frequency of the electric water heater is increased, and more energy and energy are wasted.

Or, when the user is on vacation and in a cold climate, if you want to enjoy hot water immediately when you go home, you must keep the electric water heater on, so during this time, the electric water heater still It is necessary to continuously heat the hot water to keep it warm, which also causes waste of unnecessary electric energy.

In addition, the business premises usually supply hot water throughout the day, and the electric water heaters used do not have the need for multiple periods of energy saving, and the water temperature in the water storage tank must be kept within a relatively high temperature range. Allowing the user to enjoy the hot water at any time, but even in the long period of time, when no one uses hot water at all, the electric water heater must keep the water temperature in the water tank within the above-mentioned higher temperature range, so There must be more heat preservation and heating, so it will cause a huge waste of electrical energy.

The reason is that in order to improve the aforementioned electric water heater with or without multi-stage time-saving energy-saving function, during the period when hot water is available, it is unavoidable that the insulation heating frequency may be too high due to long periods of idleness, resulting in unnecessary The problem of waste of electric energy, the present invention provides an energy-saving function for allowing an electric water heater to lower the hot water holding temperature in the water storage tank during the period of providing hot water of the electric water heater, without water or continuous use of water for a short period of time. However, if the continuous water consumption period is long, the electric water heater performs the function of normal heat preservation and heating, so that the hot water is maintained in the normal heating and heat preservation state in the higher temperature range value, thereby not only achieving the purpose of energy saving, but also When the water is continuously used for a long time, the electric water heater can heat the water to the state of the water temperature of the normal hot water supply in the shortest time and keep warm.

The technical solution adopted by the present invention is to continuously detect the current hot water temperature and whether there is a water detecting program for using hot water; if the hot water is not used, the hot water is lower. The energy-saving heating program for the thermal insulation of the temperature value; however, if there is hot water, the continuous water detection procedure is carried out comparing the cumulative time of the actual continuous water with the preset value of the length of the water used; if the actual continuous water is accumulated If the preset value is less than the length of the water use time, the energy-saving heating program is returned; however, if the actual continuous water accumulation time is greater than or equal to the preset value of the water use time length, the normal heating process of the hot water normal heating and heat preservation is performed.

In the above solution, the control step of the energy saving control method is: step (a) continuously detecting the current hot water temperature and whether there is water; and step (b) performing step (c) if there is no water; Step (f); Step (c) returns the accumulated time of the actual continuous water to zero; and if the current hot water temperature is less than or equal to the preset value of the water-saving upper limit of the energy-saving heating, the step (d) is performed; Returning to step (a); step (d) heating the hot water; step (e) if the current hot water temperature is greater than or equal to the preset value of the energy-saving heating water temperature upper limit after the subtraction, the heating is stopped, and then Going back to step (a); otherwise, directly returning to step (a); step (f) detecting the time of actual continuous water accumulation, if it is greater than or equal to the preset value of the length of water used, then performing step (g) Conversely, returning to step (a); step (g) if the current hot water temperature is less than or equal to the preset value of the normally heated water temperature upper limit after the subtraction, then step (h) is performed; otherwise, returning to the step (a); step (h) heating the hot water; step (i) if the current hot water temperature is greater than or equal to the minus code When the heating temperature upper limit of a preset constant value, the heating is stopped, returns to the step (A); the other hand, returns to the step (h).

Therefore, according to the present invention, the current hot water temperature and the presence or absence of water are continuously detected, and when the electric water heater is idle or the time for continuous water accumulation is too short, the energy saving operation of lower temperature value is performed. The hot water temperature can not only be kept within a predetermined low temperature range, but also can greatly reduce the frequency of heat preservation and heating, thereby achieving the purpose of saving electricity and energy; and when the continuous water accumulation time is slightly longer, the hot water can be quickly The water temperature is heated to the normal supply of hot water, so that the user does not have too hot water temperature, less heat preservation, and can quickly obtain the normally set hot water temperature.

Therefore, the present invention can be fully understood and implemented by the following embodiments in conjunction with the accompanying drawings.

Referring to the first figure, the energy-saving control method of the present invention mainly causes the system to continuously detect the temperature value of the hot water in the current storage bucket after starting the energy-saving function, and simultaneously performs the water detection procedure 1 . Detect whether the user currently has water or not. If there is no water, perform the energy-saving heating program 2, but if there is water, execute the continuous water detection program 3, if the actual continuous water accumulation time is less than water When the preset value of the length of time is reached, the energy saving heating program 2 is returned; however, if the actual continuous water accumulation time is greater than or equal to the preset value of the water use time length, the normal heating routine 4 is executed.

The above-described energy-saving heating program 2 is an operation for keeping the hot water in the water storage tank at a lower temperature range value (for example, a set value of 50 ° C).

The above-mentioned continuous water detection program 3, which is to measure the length of time that the user uses the continuous water when using water, determines whether the energy-saving heating program is still executed or enters the normal heating process.

The normal heating program 4 described above is an insulation heating operation in which the hot water in the water storage tank is maintained at a predetermined higher temperature range value (for example, a set value of 65 ° C).

Therefore, according to the above control method and its purpose, the steps of its control execution are as follows:

1. Pre-set the following control parameters:

T ₁ .set: preset water temperature upper limit for energy-saving heating

T ₂ .set: preset water temperature upper limit for normal heating

T.d: preset temperature difference for starting heating

Etime: preset value of the length of water used

2. Start the energy saving function.

3. Perform the following control steps:

(a) continuously detecting the current water temperature value T of the hot water in the water tank and detecting the presence or absence of the water flow signal F.S;

(b) If there is no water, the water flow signal FS is OFF, then step (c) is performed; otherwise, if there is water, the water flow signal FS is ON, then step (f) is performed (this is the presence or absence of the water detection program 1) );

(c) Zero the time of actual continuous water accumulation (ie, Rtime=0); and if T≦T ₁ .set-Td, perform step (d); otherwise, return directly to step (a);

(d) heating the water in the water tank;

(e) If T≧T ₁ .set, stop heating and then return to step (a); otherwise, return directly to step (a) (steps (c) to (e) are energy-saving heating procedures 2);

(f) detecting the time Rtime of actual continuous water use;

If Rtime ≧ Etime, then step (g) is performed; otherwise, directly return to step (a) (this is the continuous water detection procedure 3);

(g) If T≦T ₂ .set-Td, perform step (h); otherwise, return directly to step (a);

(h) heating the water in the water tank;

(i) If T≧T ₂ .set-Td, stop heating and return to step (a); otherwise, return to step (h) (steps (g) to (i) are normal heating procedures 4) ;

Therefore, through the above-mentioned loop control method, the electric water heater can control the heat preservation of the lower temperature value (for example, the set value is 50 ° C) when the electric water heater is in an idle state during the hot water supply period, The purpose is to reduce the frequency of insulation heating when idle for a long time, thereby achieving waste of unnecessary electric energy, making it more energy-saving and energy-saving; and when someone starts using a large amount of water for a long time and a long time In addition to the higher temperature value of the insulation heating control (for example, the set value is 65 ° C), and let the water temperature by energy-saving insulation, the electric water heater can be quickly heated to the normal supply of hot water in a short time. The state of the water temperature makes the user feel that the water temperature is too cold and the time for waiting for the temperature to rise is too long.

The above embodiments of the present invention have been disclosed and described in detail, which are clearly understood by those skilled in the art, and the various changes in the various types and methods are not It is out of the spirit and scope of the invention.

1. . . With or without water detection program

2. . . Energy saving heating program

3. . . Continuous water detection program

4. . . Normal heating procedure

T. . . Current hot water temperature

T ₁ .set. . . Water temperature upper limit for energy saving heating

T ₂ .set. . . Normally heated water temperature upper limit

T.d. . . Start heating differential preset

Etime. . . Preset value of the length of water used

Rtime. . . Actual cumulative time of continuous water use

F.S. . . Water flow signal (ON/OFF)

The first figure is a schematic diagram of the energy saving control of the present invention.

1. . . Detection procedure with or without water

2. . . Energy saving heating program

3. . . Continuous water detection program

4. . . Normal heating procedure

T. . . Current hot water temperature

T ₁ .set. . . Water temperature upper limit for energy saving heating

T ₂ .set. . . Normally heated water temperature upper limit

T.d. . . Start heating differential preset

Etime. . . Preset value of the length of water used

Rtime. . . Actual cumulative time of continuous water use

F.S. . . Water flow signal (ON/OFF)

Claims (2)

An energy-saving control method for an electric water heater is to continuously detect the current hot water temperature and whether there is a water detecting program for using or not using hot water; if no hot water is used, the hot water is subjected to a lower temperature value. Energy-saving heating program for heating and heat preservation; however, if there is hot water used, the continuous water detection procedure is carried out for comparing the cumulative time of actual continuous water with the preset value of the length of water used; if the actual continuous water is accumulated for less than the water When the preset value of the time length is reached, the energy-saving heating program is returned; however, if the actual continuous water accumulation time is greater than or equal to the preset value of the water use time length, the normal heating process of heating and maintaining the higher temperature value is performed. An energy-saving control method for an electric water heater is a preset water temperature upper limit T ₁ .set for a preset energy-saving heating, a preset temperature T ₂ set for a normal heating water temperature, a preset temperature value Td for starting heating, and a water time. The preset value of the length, and after starting the energy saving function, the following control steps are performed: (a) continuously detecting the current water temperature value T of the hot water, and the presence or absence of the water flow signal (ON/OFF); (b) If there is no water, the water flow signal is OFF, then step (c) is performed; but if the water flow signal is ON, then step (f) is performed; (c) the time of actual continuous water accumulation is reset to zero; When T≦T ₁ .set-Td, step (d) is performed; otherwise, directly return to step (a); (d) heating the hot water; (e) stopping if T≧T ₁ .set Heating, then returning to step (a); otherwise, returning directly to step (a); (f) detecting the actual accumulated time of continuous water use, if it is greater than or equal to the preset value of the length of water used, then the steps are performed ( g); otherwise, go directly back to step (a); (g) if T≦T ₂ .set-Td, then perform step (h); otherwise, return to step (a); (h) for hot water Heating is performed; (i) If T≧T ₂ .set-Td, the heating is stopped, and then the process returns to step (a); otherwise, it returns to step (h).