KR20150026170A - Variable flow rate control solar heat system with coil contained heat storage tank - Google Patents

Abstract

The present invention relates to a variable flow rate controlled solar heat system equipped with a coil contained heat storage tank. The present invention comprises: a collector which collects the solar energy; a collector return pipe in which a working medium circulates; the heat storage tub for heat exchange in the water; a thermal storage tank return pipe to supply warm water in the heat storage tank to a load side; a circulation pump to circulate industrial water; a heat exchange coil connected to the thermal storage tank return pipe; and a controller to turn the circulation pump on and off and to control the circulation flow rate of the collector. According to the present invention, it is possible to prevent a reversing phenomenon caused by the higher outlet temperature than the inlet temperature of the collector by applying a variable flow rate application method.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a solar heating system having a coil built-

[0001] The present invention relates to a solar-energy-controlled solar heating system having a coil built-in thermal storage tank, and more particularly, to a solar- The present invention relates to a solar-energy-controlled solar heating system having a built-in coil heat storage tank.

The present invention has been derived from research carried out as part of the Knowledge Economy Technology Innovation Project (Welfare-type Energy Technology Development Project) of the Ministry of Knowledge Economy and the Energy Technology Evaluation and Research Institute [Project number: 2012T100100689, Title: Combination system of hot- Development].

In recent years, as alternative energy for petroleum resources, there has been an increasing trend of generating electricity using solar heat or applying hot water system. In this trend, solar hot water systems that produce hot water using solar heat are widely commercialized.

A technology related to such a solar hot water system has been proposed in Patent Registration No. 0435831. [

Hereinafter, the system structure disclosed in the patent registration No. 0435831 as a prior art will be briefly described.

FIG. 1 is a schematic view of a solar-heating boiler system in Patent Registration No. 0435831 (hereinafter referred to as "prior art"). Referring to FIG. 1, a conventional solar boiler system includes first, second and third heat exchange coils 110, 120 and 130 installed therein, and first, second and third heat exchange coils 110, 120 and 130 A heat storage tank 100 having temperature sensors 640, 620 and 610 for measuring the temperature of the hot water inlet pipe 140 and the hot water discharge pipe 150 respectively installed at upper and lower portions thereof; A solar collector 200 connected to the first heat exchange coil 110 by a heat collection pipe 220 and having an air vent 210 and a temperature sensor 650 installed and connected; A gas boiler 300 having a heat exchanger 320 connected to the second and third heat exchange coils 120 and 130; And a heating load (500) connected to the heat exchanger (320) by a heating pipe (340) and provided with a temperature sensor (630).

Although not shown in the drawing, the conventional solar thermal system has a heat exchanger coil at the middle or lower of the heat storage tank when the scale is small and small. The reason for this is that when the temperature of the heating medium at the outlet of the collector is lower than the temperature at the top of the storage tank, the heating medium does not heat the water in the storage tank but rather cools the cooling water. In this way, since the lower end of the heat storage tank is heated through the heat exchange coil provided below the middle of the heat storage tank, the whole is uniformly mixed by buoyancy, and the temperature of the whole heat storage tank becomes uniform. However, as described above, the conventional solar thermal system can prevent the reverse phenomenon, but the stratification in which the temperature at the lower end of the storage tank is higher than the upper temperature is required to be abandoned.

KR 0435831 B1

An object of the present invention is to solve the problems of the prior art as described above, and it is an object of the present invention to provide a heat accumulating device capable of inducing stratification promotion by arranging heat exchanger coils densely in the upper part of the heat accumulating tank, If the temperature of the outlet of the collector is lower than the temperature of the top of the storage tank, the circulation amount of the circulation pump is decreased step by step. If the temperature difference between the outlet temperature of the collector and the outlet of the storage tank is higher than the upper limit value And the circulation amount of the circulation pump is increased step by step so as to prevent the reverse phenomenon occurring due to the outlet temperature higher than the inlet temperature of the collector in the heat collection operation through the application of the variable flow rate, System.

According to an aspect of the present invention, there is provided a solar cell module comprising: a collector for collecting solar heat; A collector circulation pipe connected to the collector and circulating a working medium through which solar heat collected by the collector is accumulated; A heat storage tank for performing heat exchange between the working medium and water used for living; A heat storage tank circulation pipe communicating with the heat storage tank and having a time flow therein and the hot water of the heat storage tank being supplied to the load side; A circulation pump circulating the water accommodated in the heat storage tank; A heat exchange coil communicating with the collector circulation pipe and connected to the lower end of the interior of the heat storage tank, the concentration of the upper end being concentrated; And a controller for controlling on / off control of the circulation pump according to a difference between the outlet temperature of the collector and the outlet temperature of the storage tank, and a controller for controlling a circulation flow rate of the collector according to a temperature difference between the outlet temperature of the collector and the top temperature of the storage tank. Controlled solar heat system with a heat storage tank.

The controller of the present invention turns on the circulation pump when the ΔT which is the difference between the collector outlet temperature (T2) and the storage tank outlet temperature (T1) is equal to or higher than the set upper limit value (ΔTon) The controller controls the circulation pump to be turned off while controlling the amount of oil change when ΔTcs (= T2-T3) which is the difference between the collector outlet temperature (T2) and the storage tank top temperature (T3) is equal to or higher than the set upper limit value .

Further, the controller of the present invention can control the circulating flow rate of the collector to be decreased by a set step when T2 > T3 or 0 &lt; T <

Further, in the present invention, the controller can control the circulating flow rate of the collector to increase by a set step if? Tcs > 0, and? T >

In addition, the controller of the present invention can control the circulating flow rate of the collector to be decreased immediately by the set step when? Tcs <0.

According to the present invention, since the heating medium heated by the heat collector intensively heats the upper part of the heat accumulating tank through the thermally-conducting coil provided in the upper part of the heat accumulating tank densely than the lower end, the stratification promotion can be induced and the sunrise, sunset, If the outlet temperature of the collector is lower than the uppermost temperature of the storage tank, the circulation amount of the circulation pump is decreased stepwise. If the temperature difference between the outlet temperature of the collector and the outlet of the storage tank is larger than the upper limit value for turning on the circulation pump, It is possible to prevent an inversion phenomenon that occurs due to the outlet temperature being higher than the inlet temperature of the collector in the heat collecting operation.

FIG. 1 is a schematic diagram of a conventional solar boiler system.
FIG. 2 is a schematic view showing the structure of a solar-energy-controlled solar thermal system including a coil built-in thermal storage tank according to the present invention.
FIG. 3 is a schematic view showing the structure of a heat storage tank in a variable flow rate solar control system having a coil built-in thermal storage tank according to the present invention.

The terms or words used in the present specification and claims are intended to mean that the inventive concept of the present invention is in accordance with the technical idea of the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain its invention in the best way Should be interpreted as a concept.

Throughout the specification, when an element is referred to as "comprising &quot;, it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the term " part "in the description means a unit for processing at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the configuration of a solar heat control system with a built-in coil type heat storage tank according to the present invention will be described in detail with reference to the drawings.

FIG. 2 is a schematic view showing a structure of a solar-energy-controlled solar thermal system including a coil-built thermal storage tank according to the present invention, and FIG. 3 is a schematic view of the structure of a thermal storage tank in a solar- Respectively.

1 is a schematic view of a solar heat control system according to the present invention; FIG. 2 is a perspective view of a solar heat control system according to a first embodiment of the present invention; A heat storage tank circulation pipe 150, a controller 160 and first, second and third temperature sensors S1, S2 and S3.

Meanwhile, the variable-volume control type solar thermal system 100 including the coil built-in thermal storage tank of the present invention can be applied to various sizes without being limited to any one of small size, medium size, and large size.

The heat accumulator 130 and the first and third temperature sensors S1 and S3 are connected to the outside of the room by the heat accumulator 110, the heat accumulator circulation pipe 150, the circulation pump 120 and the second temperature sensor S2, .

The heat storage tank 110 is covered with a heat insulating material to prevent heat from being discharged to the outside and is connected to the heat collector circulation pipe 140 and the heat storage tank circulation pipe 150. The heat collector circulation pipe 140 is composed of a collector inlet pipe 141 and a collector outlet pipe 142. The heat storage pipe circulation pipe 150 is composed of a water pipe 151 and a load side pipe 152, The details will be described below.

That is, the thermal storage tank 110 is provided so as to be filled with water through the water supply pipe 151 through a water supply pipe 151 provided at a lower portion thereof, and is connected to the heat storage tank 110 through a load- Of hot water is supplied to the load side for use in daily life.

In the present invention, the state in which the water is heated will be referred to as hot water. The hot water flowing into the heat storage tank 110 is discharged through the load side supply pipe 152 and used for living.

The coil 112 communicates with the ends of the collector inlet pipe 141 and the collector outlet pipe 142 and is connected from the upper end to the lower end of the inside of the thermal storage tank 110 and is arranged concentrically at the upper end. That is, the coils 112 are disposed at narrow intervals at the upper part of the heat storage tank 110, and spaced apart from each other in the middle and lower parts.

The heating medium heated by the collector 130 according to the installed position of the coil 112 is heated by the temperature sensor T2 sensed by the second sensor S2 to the temperature detected by the third sensor S3 110) When the temperature is higher than the uppermost temperature T3, the upper part of the heat storage tank 110 is intensively heated and then the middle part and the lower part are heated, which is a very advantageous structure in terms of promoting stratification. Stratification refers to a phenomenon in which high-temperature water is collected at the upper end and low-temperature water is collected at the lower end to supply hot water of the highest quality.

The circulation pump 120 operates at the command of the controller 160 and circulates the water contained in the heat storage tank 110. The circulation pump 120 is operated by differential temperature control for controlling the operation of the circulation pump 120 through an outlet temperature of the collector 130 and an outlet temperature of the accumulator 110 or an inlet temperature difference of the collector 130 do.

Further, although not shown in the drawings, an inverter is additionally provided in the circulation pump 120 to control the number of revolutions, so that the amount of circulation can be adjusted. Here, when the circulation pump 120 is stopped, the solar energy is "0 ".

The collector 130 is connected to the collector inlet pipe 141 at one side and the collector pipe 142 at the other side such as a roof or roof of a building.

The collector 130 collects solar heat and heats the water supplied by the circulation pump 120. Various types of collectors such as a vacuum tube type and a flat plate type can be used.

The collector circulation pipe 140 is a closed pipe that is not connected to the outside, and a part of the collector circulation pipe 140 is located inside the collector 130. The collector circulation pipe 140 connects the collector 130 and the storage tank 110 and provides a flow path for discharging the water heated by the collector 130 to the storage tank 110.

In addition, the collector circulation pipe 140 includes a collector inlet pipe 141 provided on the side where the water flows on the collector 130, and a collector outlet pipe 142 provided on the side where the hot water is discharged.

That is, the collector inlet pipe 141 is provided so that the water accommodated in the heat storage tank 110 can be introduced into the collector 130, and the water discharged from the collector pipe 130 is discharged to the heat storage tank 110 As shown in FIG.

In this configuration, the collector discharge pipe 142 is located at a relatively higher position than the collector inlet pipe 141, water flows into the collector inlet pipe 141, hot water is discharged to the collector discharge pipe 142, It can be seen that it flows. This is to increase the stratification effect of the hot water stored in the thermal storage tank 110. The water introduced into the thermal storage tank 110 is located at the lower part due to stratification and is heated in the thermal storage tank 110 at a relatively high temperature Is higher than the temperature of the hot water in the lower position, the hot water of the higher temperature can be used.

Although not shown in the drawing, a part of the collector circulation pipe 140 located in the collector 130 is connected to the inside of the collector 130 so that the solar heat collected by the collector 130 can be transmitted as much as water. It is preferable to make it widely distributed.

The heat storage tank circulation pipe 150 is connected to the storage tank 110 and supplies the water to the lower part of the storage tank 110 and provides a flow passage for discharging the water located in the upper part of the storage tank 110, And a load side supply pipe 152. The water pipe 151 is connected to the lower part of the thermal storage tank 110 for the stratification of hot water stored in the thermal storage tank 110 and the load side supply pipe 152 is connected to the upper part of the thermal storage tank 110.

The controller 160 is a temperature controller that receives signals output from the first, second, and third temperature sensors S1, S2, and S3 to be described later, and controls the operation of the circulation pump 120 in accordance with the signals do. At this time, the first temperature sensor S1 is installed in the outlet-side collector inlet pipe 141 of the storage tank 110 to detect the outlet temperature T1 of the storage tank 110, and the second temperature sensor S2 Is installed in the outlet side collector discharge pipe 142 of the collector 110 to detect the outlet temperature T2 of the collector 130 and the third temperature sensor S3 is installed at the uppermost temperature (110) for measuring the temperature (T3).

That is, the controller 160 controls the temperature of the collector outlet temperature T2, which is the water discharge temperature of the collector 130 detected from the second temperature sensor S2, (T) is equal to or greater than the set upper limit value (Delta Thon), the circulation pump 120 is controlled to be ON, and if the difference (DELTA Toff) between the storage tank outlet temperature T1 And controls the pump 120 to be turned off.

The set upper limit value for turning on the circulation pump 120 is, for example, 10 to 14 占 폚 (preferably 12 占 폚) and the set lower limit value for turning off the circulation pump 120 is? Deg.] C (preferably, 2 [deg.] C), and the present invention is not limited to this.

The controller 160 adjusts the circulation flow rate of the collector according to the ON / OFF function of the circulation pump 120 according to the difference ΔTcs (= T2-T3) between the collector outlet temperature T2 and the heat storage tank top temperature T3 So that the reverse phenomenon can be prevented and the stratification phenomenon can be maximized.

In addition, the controller 160 has a possibility that the temperature T1 of the collector is lower than the temperature T3 of the top of the storage tank 110 due to a sunrise, a sunset, and a hot water load so that the upper portion of the storage tank 110 is hot, The amount of circulation of the circulation pump 120 is decreased step by step and the amount of circulation of the circulation pump 120 is increased step by step when the solar radiation condition is improved, So that the inversion phenomenon that occurs due to the higher outlet temperature than the temperature can be prevented.

The circulation flow rate can be adjusted according to the degree of opening of the valve after the valve (not shown in the figure) is installed in the collector inlet pipe 141 of the inverter or the heat collector circulation pipe 140, And can be operated step by step. In this case, the circulation flow rate adjustment step can be carried out by setting the flow rate difference in the third to fifth steps. For example, in the first step (first step operation), 100% ) Refers to the operating state of 50%, and the third step (third operation) refers to the operating state of 25%.

Hereinafter, the conditions for controlling the amount of oil inflow in the controller 160 will be described.

1)? Tcs (= T2-T3) > 0, i.e., the non-reversing mode

If the outlet temperature T2 of the collector is higher than the uppermost temperature T3 of the heat storage tank and the circulation flow rate is decreased step by step when the sunrise, sunset or solar radiation is unstable, the operation time can be lengthened,

(1) When? Tcs> 0 and 0 <? T <? Off +?, The circulating flow of the collector 130 is decreased by one step. (100% for example) and the flow rate is changed to the two-stage operation (for 50% operation) if? T (= T2-T1) is smaller than? And the collector outlet temperature (T2) is increased. Here, delta represents an allowance value of the set lower limit value [Delta] Toff for turning off the circulation pump 120. [

(2) If ΔTcs> 0 and ΔT> ΔTon · α, the circulating flow of the collector 130 is increased by one step. (? is 0.75 占 폚, for example). That is, if? Ton of the upper limit value? Ton (12 占 폚, for example) is 9 占 폚 or more, the flow rate is raised by one step. Here,? Represents an allowable value of the upper limit value? Ton for setting the circulating pump 120 to be ON.

2)? Tcs < 0, i.e., a reversing mode

When the tap water is supplied through the water pipe 151 provided at the lower part of the thermal storage tank 110 due to the hot water supply load, the lower temperature of the thermal storage tank 110 is lowered and the upper part is still filled with hot water.

(1) When? Tcs < 0, the circulating flow of the collector 130 is immediately lowered to prevent the reverse phenomenon.

(2) The conditions in which the flow rate increases again when the reverse phenomenon is blocked is that the circulating flow of the collector 130 is increased by one step if? Tcs > 0 and DELTA T > (? is 0.75 占 폚, for example). That is, if? Ton of the upper limit value? Ton (12 占 폚, for example) is 9 占 폚 or more, the flow rate is raised by one step. Here,? Represents an allowable value of the upper limit value? Ton for setting the circulating pump 120 to be ON.

The obtained calorific value according to the above phenomenon can be obtained by the following equation (1).

는 집열기 획득열량이고,

은 순환유량이고, Cp는 비열이며, ΔT =T2-T1이다. 즉,

이 일정한 상태에서

이 작아지면 ΔT가 증가하는 원리를 이용한 것이다.
here,

Is the heat amount of the collector,

Is the circulating flow rate, Cp is the specific heat, and? T = T2-T1. In other words,

In this constant state

Is used, the principle that? T increases is used.

Therefore, the variable-volume-control solar thermal system 100 provided with the coil built-in type thermal storage tank of the present invention is instantaneously lowered to 2 ° C or lower, which is the temperature of ΔToff, when the sunrise, sunset, hot water load or solar radiation state is unstable and ΔT is lower than the set lower limit value. For example, if ΔT reaches 3 ° C. and ΔToff temperature is 2 ° C., then the Δ value will be 1 ° C. and ΔToff + δ will be 3 ° C., and if ΔToff + δ is 3 ° C., solar system 100 will turn off after a while The circulation amount of the circulation pump 120 is lowered by one level under the control of the controller 160.

At this time, when the circulation amount of the circulation pump 120 is lowered by one step and the second step (two-step operation) of 50% of the operation state is reached, .

Then, if ΔT falls back to 3 ° C., it means that the solar thermal system 100 is turned off after a while, so that the circulation amount of the circulation pump 120 is further lowered under the control of the controller 160 to a further 25% The third step (three-step operation) is reached, and in this case,? T increases from 3 占 폚 to 6 占 폚.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the equivalents of the appended claims, as well as the appended claims.

100: Transformed Solar System
110: heat storage tank 112: coil
120: Circulation pump 130: Collector
140: Collector circulation pipe 150: Heat storage tank circulation pipe
160: controller S1, S2, S3: first, second and third temperature sensors

Claims (5)

A collector for collecting solar heat;
A collector circulation pipe connected to the collector and circulating a working medium through which solar heat collected by the collector is accumulated;
A heat storage tank for performing heat exchange between the working medium and water used for living;
A heat storage tank circulation pipe communicating with the heat storage tank and having a time flow therein and the hot water of the heat storage tank being supplied to the load side;
A circulation pump circulating the water accommodated in the heat storage tank;
A heat exchange coil communicating with the collector circulation pipe and connected to the lower end of the interior of the heat storage tank, the concentration of the upper end being concentrated; And
And a controller for controlling on / off control of the circulation pump according to a difference between the outlet temperature of the collector and the outlet temperature of the storage tank and a controller for controlling a circulating flow rate of the collector according to a temperature difference between the outlet temperature of the collector and the top temperature of the storage tank, And a solar control system.
2. The apparatus of claim 1,
The circulation pump is turned on when ΔT, which is a difference between the collector outlet temperature (T2) and the temperature of the storage tank (T1), is higher than a preset upper limit value (ΔTon)
And a coil built-in type heat storage tank for controlling the amount of oil change when ΔTcs, which is a difference between the collector outlet temperature (T2) and the heat storage tank top temperature (T3), is equal to or higher than a set upper limit value or lower than a set lower limit value.
3. The method of claim 2,
Wherein the controller controls the circulation flow rate of the collector to be decreased by a set step when T2 > T3 when? Tcs > 0 or 0 <
3. The method of claim 2,
Wherein the controller controls the circulating flow rate of the collector to increase by a set step when? Tc > 0, and when? T>? Ton?
3. The method of claim 2,
Wherein the controller controls the circulating flow rate of the collector to be decreased immediately by a predetermined number of steps when? Tcs <0.

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