CN104061613A - Two-network water supply and return temperature control method aiming at solar radiation - Google Patents

Abstract

The invention discloses a two-network water supply and return temperature control method aiming at solar radiation. According to the method, the real-time environment temperature of a building heat load and the solar radiation are integrated into the integral outdoor temperature. The method concretely comprises the following steps that each factor in an integral comprehensive outdoor temperature calculation formula of a building is determined; integral outdoor temperatures corresponding to four wall bodies including the east wall body, the south wall body, the west wall body and the north wall body are calculated; the integral comprehensive outdoor temperature of the building is calculated; factors in a simplified two-network water supply and return temperature calculation formula are calculated; the two-network water supply and return temperature is determined. The method provided by the invention has the advantages that the two-network water supply and return temperature can be accurately and reliably determined, and the excessive heat supply is avoided.

Description

The two net supply and return water temperature control methods for solar radiation

Technical field

The invention belongs to central heating technical field, be specifically related to a kind of two net supply and return water temperature control methods for solar radiation.

Background technology

Along with social high speed development, with the increase of heat demand, and the requirement of energy-saving and emission-reduction work, China's central heating cause develops rapidly.Central heating technology rely on its energy utilization rate high, improve environmental sanitation, be easy to realize scientific management and improve the advantages such as heating quality, become the mainstream technology of winter heating, in heating, play an important role in the winter time.

Central heating technology says it is the variation according to environmental condition from root, regulates heating demand, makes heating building remain on setting, comfortable temperature, reduces unnecessary thermal loss.Visible, the control method of load has a great impact the quality of constructure heating, and load adjusting method is the important foundation of advanced central heating technology accurately and reliably, is to improve the thermal efficiency, reduces effective assurance of energy loss and waste.

The load of central heating normally calculates and obtains according to environment real time temperature, does not consider the impact of solar radiation on Real-time Load.Due to the existence of solar radiation, the heat of building increases, and required heat supply Real-time Load can corresponding minimizing.And current Load Calculation Method is not considered these influence factors, therefore there is larger deficiency, easily cause larger deviation.

Therefore propose a kind of two net supply and return water temperature control methods for solar radiation, to promoting the energy-saving and cost-reducing of central heating, have important practical significance.

Summary of the invention

The present invention is directed to the problems referred to above, a kind of two net supply and return water temperature control methods for solar radiation are provided.

The technical solution used in the present invention is: a kind of two net supply and return water temperature control methods for solar radiation, are integrated into comprehensive outdoor temperature by the real time environment temperature of building thermic load and solar radiation; Specifically comprise the following steps:

S1, determines that the whole synthesis outdoor temperature of building is calculated each coefficient in formula: determine whole synthesis outdoor temperature calculating formula of reduction t _z=k ₁t _z1+ k ₂t _z2+ k ₃t _z3+ k ₄t _z4in weight coefficient k ₁, k ₂, k ₃, k ₄; k ₁, k ₂, k ₃, k ₄be respectively the weight coefficient of four sides exterior wall, at definite k ₁, k ₂, k ₃, k ₄time, the ratio that every the exterior wall area of usining accounts for the four sides exterior wall gross area is as the numerical value of weight coefficient separately;

S2, calculates the corresponding comprehensive outdoor temperature of east, south, west, north four sides body of wall: first obtain the total radiation intensity I of each face wall body,

Dong Qiang $I_1=I_0\{P^m\cos \mathrm{\β}\cos {\mathrm{\θ}}_1+\frac{\sin \mathrm{\β}(1-P^m)}{4(1-1.4\ln P)}+\frac{{\mathrm{\ρ}}_0\sin \mathrm{\β}}{2}[P^m+\frac{1-P^m}{2(1-1.4\ln P)}\left]\right\}$

Nan Qiang $I_2=I_0\{P^m\cos \mathrm{\β}\cos {\mathrm{\θ}}_2+\frac{\sin \mathrm{\β}(1-P^m)}{4(1-1.4\ln P)}+\frac{{\mathrm{\ρ}}_0\sin \mathrm{\β}}{2}[P^m+\frac{1-P^m}{2(1-1.4\ln P)}\left]\right\}$

Xi Qiang $I_3=I_0\{P^m\cos \mathrm{\β}\cos {\mathrm{\θ}}_3+\frac{\sin \mathrm{\β}(1-P^m)}{4(1-1.4\ln P)}+\frac{{\mathrm{\ρ}}_0\sin \mathrm{\β}}{2}[P^m+\frac{1-P^m}{2(1-1.4\ln P)}\left]\right\}$

North wall $I_4=I_0\{\frac{\sin \mathrm{\β}(1-P^m)}{4(1-1.4\ln P)}+\frac{{\mathrm{\ρ}}_0\sin \mathrm{\β}}{2}[P^m+\frac{1-P^m}{2(1-1.4\ln P)}\left]\right\}$

Wherein: I ₀---solar constant, W/m ²;

P---atmospheric transparency;

ρ ₀---ground average rate;

θ ₁, θ ₂, θ ₃---wall-solar azimuth of east, south, Xi Qiang;

β---sun altitude;

m——

Adopt again following formula to calculate comprehensive outdoor temperature corresponding to four sides body of wall:

$t_{z1}=t_w+\mathrm{\ρ}\frac{I_1}{\mathrm{\α}}$

$t_{z2}=t_w+\mathrm{\ρ}\frac{I_2}{\mathrm{\α}}$

$t_{z3}=t_w+\mathrm{\ρ}\frac{I_3}{\mathrm{\α}}$

$t_{z4}=t_w+\mathrm{\ρ}\frac{I_4}{\mathrm{\α}}$

In above formula, ρ is the absorptivity of body of wall to solar radiation, the Composite Walls that α is exterior surface of wall, t _wfor outdoor temperature;

S3, the whole synthesis outdoor temperature of calculating building: outdoor integrated temperature corresponding to four sides body of wall of calculating according to step S2, adopt the whole synthesis outdoor temperature in step S1 to calculate formula of reduction, calculate the whole synthesis outdoor temperature of building;

S4, determines the coefficient in two net supply and return water temperature computational short cut formula: in statistics heat supply running process, the test data of each temperature parameter, by analysis calculative determination two net supply and return water temperature computational short cut formula: t _m=at _z+ bt _nin coefficient a, b; Wherein a and b are constant, t _nand t _zbe respectively the comprehensive outdoor temperature of indoor design temperature and whole building;

S5, determines two net supply and return water temperatures: the outer integrated temperature of monolithic chamber calculating according to step S3, utilize the computational short cut formula in step S4, determine two net supply and return water temperatures.

Further, described heat supply network supply and return water temperature is heat supply network supply water temperature, heat supply network return water temperature or supplies backwater mean temperature.

Further, described whole synthesis outdoor temperature is that comprehensive outdoor temperature corresponding to four sides body of wall carried out to the temperature of amounting to after weight summation.

Further, described comprehensive outdoor temperature is the temperature of amounting to that combines the impacts such as environment temperature, solar radiation, ground return radiation.

Further, the k in described step S1 ₁, k ₂, k ₃, k ₄with a and b in step S4 be constant, can try to achieve by test.

Advantage of the present invention: according to method provided by the invention, can accurately and reliably determine two net supply and return water temperatures, avoid excessive heat supply.

Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to accompanying drawings, the present invention is further detailed explanation.

Accompanying drawing explanation

The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.

Fig. 1 is method flow diagram of the present invention.

The specific embodiment

In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.

With reference to figure 1, a kind of two net supply and return water temperature control methods for solar radiation as shown in Figure 1, are integrated into comprehensive outdoor temperature by the real time environment temperature of building thermic load and solar radiation; Specifically comprise the following steps:

S1, determines that the whole synthesis outdoor temperature of building is calculated each coefficient in formula: determine whole synthesis outdoor temperature calculating formula of reduction t _z=k ₁t _z1+ k ₂t _z2+ k ₃t _z3+ k ₄t _z4in weight coefficient k ₁, k ₂, k ₃, k ₄; k ₁, k ₂, k ₃, k ₄be respectively the weight coefficient of four sides exterior wall, at definite k ₁, k ₂, k ₃, k ₄time, the ratio that every the exterior wall area of usining accounts for the four sides exterior wall gross area is as the numerical value of weight coefficient separately;

S2, calculates the corresponding comprehensive outdoor temperature of east, south, west, north four sides body of wall: first obtain the total radiation intensity I of each face wall body,

Dong Qiang $I_1=I_0\{P^m\cos \mathrm{\β}\cos {\mathrm{\θ}}_1+\frac{\sin \mathrm{\β}(1-P^m)}{4(1-1.4\ln P)}+\frac{{\mathrm{\ρ}}_0\sin \mathrm{\β}}{2}[P^m+\frac{1-P^m}{2(1-1.4\ln P)}\left]\right\}$

Nan Qiang $I_2=I_0\{P^m\cos \mathrm{\β}\cos {\mathrm{\θ}}_2+\frac{\sin \mathrm{\β}(1-P^m)}{4(1-1.4\ln P)}+\frac{{\mathrm{\ρ}}_0\sin \mathrm{\β}}{2}[P^m+\frac{1-P^m}{2(1-1.4\ln P)}\left]\right\}$

Xi Qiang $I_3=I_0\{P^m\cos \mathrm{\β}\cos {\mathrm{\θ}}_3+\frac{\sin \mathrm{\β}(1-P^m)}{4(1-1.4\ln P)}+\frac{{\mathrm{\ρ}}_0\sin \mathrm{\β}}{2}[P^m+\frac{1-P^m}{2(1-1.4\ln P)}\left]\right\}$

North wall $I_4=I_0\{\frac{\sin \mathrm{\β}(1-P^m)}{4(1-1.4\ln P)}+\frac{{\mathrm{\ρ}}_0\sin \mathrm{\β}}{2}[P^m+\frac{1-P^m}{2(1-1.4\ln P)}\left]\right\}$

Wherein: I ₀---solar constant, W/m ²;

P---atmospheric transparency;

ρ ₀---ground average rate;

θ ₁, θ ₂, θ ₃---wall-solar azimuth of east, south, Xi Qiang;

β---sun altitude;

m——

Adopt again following formula to calculate comprehensive outdoor temperature corresponding to four sides body of wall:

$t_{z1}=t_w+\mathrm{\ρ}\frac{I_1}{\mathrm{\α}}$

$t_{z2}=t_w+\mathrm{\ρ}\frac{I_2}{\mathrm{\α}}$

$t_{z3}=t_w+\mathrm{\ρ}\frac{I_3}{\mathrm{\α}}$

$t_{z4}=t_w+\mathrm{\ρ}\frac{I_4}{\mathrm{\α}}$

In above formula, ρ is the absorptivity of body of wall to solar radiation, the Composite Walls that α is exterior surface of wall, t _wfor outdoor temperature;

S3, the whole synthesis outdoor temperature of calculating building: outdoor integrated temperature corresponding to four sides body of wall of calculating according to step S2, adopt the whole synthesis outdoor temperature in step S1 to calculate formula of reduction, calculate the whole synthesis outdoor temperature of building;

S4, determines the coefficient in two net supply and return water temperature computational short cut formula: in statistics heat supply running process, the test data of each temperature parameter, by analysis calculative determination two net supply and return water temperature computational short cut formula: t _m=at _z+ bt _nin coefficient a, b; Wherein a and b are constant, t _nand t _zbe respectively the comprehensive outdoor temperature of indoor design temperature and whole building;

S5, determines two net supply and return water temperatures: the outer integrated temperature of monolithic chamber calculating according to step S3, utilize the computational short cut formula in step S4, determine two net supply and return water temperatures.

Wherein, heat supply network supply and return water temperature is heat supply network supply water temperature, heat supply network return water temperature or supplies backwater mean temperature; Whole synthesis outdoor temperature is that comprehensive outdoor temperature corresponding to four sides body of wall carried out to the temperature of amounting to after weight summation; Comprehensive outdoor temperature is the temperature of amounting to that combines environment temperature, solar radiation, ground return radiation effect; K in step S1 ₁, k ₂, k ₃, k ₄with a and b in step S4 be constant, can try to achieve by test.

Example:

Heat exchange station jurisdiction district, Zhou Cheng: local latitude on January 20th, 2013,09:00 outdoor temperature was-5 ℃, can be calculated declination angle and was-23.04 °, and hour angle ω was-45 ° at that time, and sun altitude β is 17.68 °, and solar azimuth A is-43.07 °, and wall-solar azimuth is respectively: θ ₁=A+90=46.93 °, θ ₂=A=-43.07 °, θ ₃get 90 °

Get solar constant I ₀be 1353, atmospheric transparency P is 0.6, ground average reflectance ρ ₀for, 0.2, the radiation intensity that calculates each metope is respectively: eastern wall 229.89W/m ², southern wall 241.28W/m ², western wall 66.14W/m ², north wall 66.14W/m ².

Getting body of wall is 0.9 to the absorptivity ρ of solar radiation, and the Composite Walls α of exterior surface of wall is 23W/ (m ²℃).Further can calculate the outdoor integrated temperature of each metope: Dong Qiang-0.2 ℃, 0 ℃, southern wall, Xi Qiang-3.6 ℃, north wall-3.6 ℃.For guaranteeing the heat supply on west and north, the weight coefficient of choosing each metope is: k ₁=0.1, k ₂=0.1, k ₃=0.4, k ₄=0.4, calculate whole synthesis outdoor temperature t _z=-3 ℃.If according to current temperature-5.0 ℃, according to the adjustment curve of Zhou Cheng Thermal Corp, supply water temperature is 51 ℃; And under solar radiation, outdoor calculate temperature is-3.0 ℃, supply water temperature is 50 ℃ and can meets thermic load, and supply water temperature declines 1 ℃, has reduced excessive heat supply.

Method provided by the invention, can accurately and reliably determine two net supply and return water temperatures, avoids excessive heat supply.The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (5)

1. for two net supply and return water temperature control methods of solar radiation, it is characterized in that: the real time environment temperature of building thermic load and solar radiation are integrated into comprehensive outdoor temperature, specifically comprise the following steps:

S1, determines that the whole synthesis outdoor temperature of building is calculated each coefficient in formula: determine whole synthesis outdoor temperature calculating formula of reduction t _z=k ₁t _z1+ k ₂t _z2+ k ₃t _z3+ k ₄t _z4in weight coefficient k ₁, k ₂, k ₃, k ₄; k ₁, k ₂, k ₃, k ₄be respectively the weight coefficient of four sides exterior wall, at definite k ₁, k ₂, k ₃, k ₄time, the ratio that every the exterior wall area of usining accounts for the four sides exterior wall gross area is as the numerical value of weight coefficient separately;

S2, calculates the corresponding comprehensive outdoor temperature of east, south, west, north four sides body of wall: first obtain the total radiation intensity I of each face wall body,

Dong Qiang $I_1=I_0\{P^m\cos \mathrm{\β}\cos {\mathrm{\θ}}_1+\frac{\sin \mathrm{\β}(1-P^m)}{4(1-1.4\ln P)}+\frac{{\mathrm{\ρ}}_0\sin \mathrm{\β}}{2}[P^m+\frac{1-P^m}{2(1-1.4\ln P)}\left]\right\}$

Nan Qiang $I_2=I_0\{P^m\cos \mathrm{\β}\cos {\mathrm{\θ}}_2+\frac{\sin \mathrm{\β}(1-P^m)}{4(1-1.4\ln P)}+\frac{{\mathrm{\ρ}}_0\sin \mathrm{\β}}{2}[P^m+\frac{1-P^m}{2(1-1.4\ln P)}\left]\right\}$

Xi Qiang $I_3=I_0\{P^m\cos \mathrm{\β}\cos {\mathrm{\θ}}_3+\frac{\sin \mathrm{\β}(1-P^m)}{4(1-1.4\ln P)}+\frac{{\mathrm{\ρ}}_0\sin \mathrm{\β}}{2}[P^m+\frac{1-P^m}{2(1-1.4\ln P)}\left]\right\}$

North wall $I_4=I_0\{\frac{\sin \mathrm{\β}(1-P^m)}{4(1-1.4\ln P)}+\frac{{\mathrm{\ρ}}_0\sin \mathrm{\β}}{2}[P^m+\frac{1-P^m}{2(1-1.4\ln P)}\left]\right\}$

Wherein: I ₀---solar constant, W/m ²;

P---atmospheric transparency;

ρ ₀---ground average rate;

θ ₁, θ ₂, θ ₃---wall-solar azimuth of east, south, Xi Qiang;

β---sun altitude;

m——

Adopt again following formula to calculate comprehensive outdoor temperature corresponding to four sides body of wall:

$t_{z1}=t_w+\mathrm{\ρ}\frac{I_1}{\mathrm{\α}}$

$t_{z2}=t_w+\mathrm{\ρ}\frac{I_2}{\mathrm{\α}}$

$t_{z3}=t_w+\mathrm{\ρ}\frac{I_3}{\mathrm{\α}}$

$t_{z4}=t_w+\mathrm{\ρ}\frac{I_4}{\mathrm{\α}}$

In above formula, ρ is the absorptivity of body of wall to solar radiation, the Composite Walls that α is exterior surface of wall, t _wfor outdoor temperature;

S3, the whole synthesis outdoor temperature of calculating building: corresponding outdoor integrated temperature and the whole synthesis outdoor temperature in step S1 of four sides body of wall of calculating according to step S2 calculated formula of reduction, calculates the whole synthesis outdoor temperature of building;

S4, determines the coefficient in two net supply and return water temperature computational short cut formula: in statistics heat supply running process, the test data of each temperature parameter, by analysis calculative determination two net supply and return water temperature computational short cut formula: t _m=at _z+ bt _nin coefficient a, b; Wherein a and b are constant, t _nand t _zbe respectively the comprehensive outdoor temperature of indoor design temperature and whole building;

S5, determines two net supply and return water temperatures: the outer integrated temperature of monolithic chamber calculating according to step S3, utilize the computational short cut formula in step S4, determine two net supply and return water temperatures.

2. the two net supply and return water temperature control methods for solar radiation according to claim 1, is characterized in that, described heat supply network supply and return water temperature is heat supply network supply water temperature, heat supply network return water temperature or supplies backwater mean temperature.

3. the two net supply and return water temperature control methods for solar radiation according to claim 1, is characterized in that, described whole synthesis outdoor temperature is that comprehensive outdoor temperature corresponding to four sides body of wall carried out to the temperature of amounting to after weight summation.

4. the two net supply and return water temperature control methods for solar radiation according to claim 1, is characterized in that, described comprehensive outdoor temperature is the temperature of amounting to that combines the impacts such as environment temperature, solar radiation, ground return radiation.

5. the two net supply and return water temperature control methods for solar radiation according to claim 1, is characterized in that the k in described step S1 ₁, k ₂, k ₃, k ₄with a and b in step S4 be constant, can try to achieve by test.