CN112946020A - Sunlight greenhouse thermal insulation performance test system - Google Patents
Sunlight greenhouse thermal insulation performance test system Download PDFInfo
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Abstract
The invention discloses a sunlight greenhouse heat preservation performance test system which comprises a temperature probe, an integrated chip and a data display part, wherein the temperature probe is used for acquiring the surface temperature of a rear wall, the ground temperature, the temperature of air inside a greenhouse and the temperature of air outside the greenhouse; the integrated chip is used for data integration processing and data accumulation processing; the data display part comprises a parameter input part and a result output part. The sunlight greenhouse heat insulation performance test system has wide application range, and can quantify the heat insulation performance of the sunlight greenhouse made of wall materials and in different latitudes, different altitude areas, different spans, heights and wall thicknesses in the northern areas of China; the evaluation index can be provided for the quality of the heat preservation performance of the sunlight greenhouse through the determination of the heat preservation performance test system of the sunlight greenhouse, the greenhouse design is optimized for greenhouse construction enterprises, and a good temperature environment is provided for the production of vegetable crops.
Description
Technical Field
The invention relates to a sunlight greenhouse heat preservation performance test system, and belongs to the field of agricultural engineering.
Background
The sunlight greenhouse is a mode for vegetable cultivation in northern areas of China in winter, the heat storage and heat preservation effects of the sunlight greenhouse are not raised to the theoretical level all the time, the sunlight greenhouse is continuously explored in production practice, and the current sunlight greenhouse has the common problems that the temperature is generally low at night, and greenhouse crops are easily subjected to cold injury and freeze injury.
The heat storage and release of the rear wall of the sunlight greenhouse and the soil belong to periodic unsteady state heat conduction, and according to the 'temperature change and heat storage and release conversion' foundation model of the rear wall and the soil, the greenhouse night temperature is lower because the heat release amount of the rear wall and the soil is larger than the heat storage amount in the periodic heat storage and release process, the heat storage and release are out of balance, and the greenhouse temperature level is continuously reduced; the heat release of the rear wall and the soil at night has an important influence on the maintenance of the heat storage and release balance of the sunlight greenhouse, the heat balance is easier to achieve when the heat release is less, and the heat insulation performance of the greenhouse at night is higher.
Researches show that the greenhouse night heat release is a process that the heat release and the temperature reduction of the rear wall and the soil are driven by the external low temperature, and in the process, the heat release of the external low temperature driven greenhouse is influenced by the through-flow heat release temperature difference (T) between the air inside and outside the greenhouseAir in greenhouse-TAir outside greenhouse) The influence of the size, linear relation exists between the through-flow heat release quantity and the through-flow heat release temperature difference; the heat release quantity of the rear wall and the soil is influenced by the heat convection temperature difference (T) between the greenhouse air and the surface of the rear wall and the greenhouse groundRear wall surface-TAir in greenhouse、TGround surface-TAir in greenhouse) The effect of (fig. 1), there is also a linear relationship between the convective heat transfer capacity and the convective heat transfer temperature difference.
The ratio (temperature difference ratio) between the through-flow heat release temperature difference and the convection heat transfer temperature difference refers to the numerical value of the through-flow heat release temperature difference required for forming the convection heat transfer temperature difference of 1 ℃, the larger the temperature difference ratio is, the less the heat release amount of the greenhouse is, and the higher the heat preservation performance is, so that the temperature difference ratio can reflect the heat preservation performance of the sunlight greenhouse at night.
Disclosure of Invention
The invention aims to solve the technical problem of providing a sunlight greenhouse heat insulation performance test system aiming at the defects in the prior art, which is used for testing the heat insulation performance of the sunlight greenhouse and determining the difference of the greenhouse in the aspect of heat insulation; secondly, according to the difference in the aspect of heat insulation performance, the structure and the materials of the greenhouse are improved, and finally the heat insulation performance of the greenhouse is improved.
In order to solve the technical problem, the invention provides a solar greenhouse heat preservation performance test system which comprises a temperature probe, an integrated chip and a data display part,
the temperature probe is used for acquiring the surface temperature of the rear wall, the ground temperature, the air temperature in the greenhouse and the air temperature outside the greenhouse;
the integrated chip is used for data integration processing and data accumulation processing; the data integration processing respectively carries out integration operation on the acquired data, calculates the through-flow heat release temperature difference and the convection heat transfer temperature difference, and calculates the integral temperature difference ratio; the data accumulation processing respectively carries out accumulation operation on the collected data, calculates the through-flow heat release temperature difference and the convection heat exchange temperature difference, and calculates the instantaneous temperature difference ratio and the accumulated temperature difference ratio;
the data display part comprises a parameter input part and a result output part, and the parameter input part inputs the rear wall height and the greenhouse span of the greenhouse; the result output part directly displays the instantaneous temperature difference ratio; and after the time period is input, displaying the integral temperature difference ratio and the accumulated temperature difference ratio.
The data integration process includes:
1) calculating T at night for a period of timeRear wall、TGround surface、TAir in greenhouse、TAir outside greenhouseIntegral value of (a ^ T)Rear wall、∫TGround surface、∫TAir in greenhouse、∫TAir outside greenhouse；
2) The integral value of the heat accumulator temperature is represented as ([ integral ] T)Rear wall*x+∫TGround surfaceY)/(x + y), x and y being the rear wall height and the greenhouse span, respectively;
3)(∫Trear wall*x+∫TGround surface*y)/(x+y)-∫TAir in greenhouseIs the convective heat transfer temperature difference on the basis of the integral value, and the integral degree of the formula TAir in greenhouse-∫TAir outside greenhouseIs a through-flow heat release temperature difference based on an integral value;
4)(∫Tair-air in greenhouse-∫TAir outside greenhouse)/[(∫TRear wall*x+∫TGround surface*y)/(x+y)-∫TAir in greenhouse]Is the integrated temperature difference ratio.
The data accumulation processing includes:
1) calculating T at night for a period of timeRear wall、TGround surface、TAir in greenhouse、TAir outside greenhouseIntegrated value of ∑ TRear wall、∑TGround surface、∑TAir in greenhouse、∑TAir outside greenhouse；
2) The accumulated value of the heat accumulator temperature is expressed as (Sigma T)Rear wall*x+∑TGround surfaceY)/(x + y), x and y being the rear wall height and the greenhouse span, respectively;
3)(∑Trear wall*x+∑TGround surface*y)/(x+y)-∑TAir in greenhouseFor convective heat transfer temperature difference on the basis of the accumulated value, sigma TAir in greenhouse-∑TAir outside greenhouseThe through-flow heat release temperature difference is based on the accumulated value;
4)(∑Tair in greenhouse-∑TAir outside greenhouse)/[(∑TRear wall*x+∑TGround surface*y)/(x+y)-∑TAir in greenhouse]To accumulate the temperature difference ratio.
X is the back wall height, and y is greenhouse ground span, and rear wall surface temperature represents rear wall surface temperature in the inboard middle part of rear wall, and greenhouse span middle part temperature represents ground temperature, and the cross temperature of rear wall middle part perpendicular line extension line and greenhouse span middle part perpendicular line extension line represents greenhouse air temperature, and greenhouse rear wall outside middle part is apart from rear wall north 50cm department air temperature and represents greenhouse outside air temperature.
Has the advantages that: 1) the sunlight greenhouse heat insulation performance test system has wide application range, can quantify the heat insulation performance of the sunlight greenhouse of wall materials and the areas with different latitudes and altitudes and different spans, heights and wall thicknesses in the northern areas of China, and provides a unified and standard heat insulation performance evaluation index; 2) taking the Weifang city in Shandong province and the Kashi city in Xinjiang autonomous region as examples, when the sunlight temperature-room temperature difference ratio of the two cities is respectively more than 13 and 15, the heat release amount at night of the greenhouse is less, the heat preservation performance is higher, and the temperature level at night of the greenhouse is higher; if the temperature level of the greenhouse at night is still low, the greenhouse has larger problems in structure and needs to be improved; 3) the current solar greenhouse construction industry is mixed with fishes and dragons, more greenhouse construction enterprises construct the solar greenhouse as a building, the appearance structure of the solar greenhouse is emphasized, the use function of the solar greenhouse is ignored, and the heat insulation performance of the built greenhouse is generally low; the evaluation index can be provided for the good and bad heat preservation performance of the sunlight greenhouse through the determination of the sunlight greenhouse heat preservation performance test system, the greenhouse design is optimized for greenhouse construction enterprises, the construction quality is improved, the use function of the constructed greenhouse is improved, the temperature level of the greenhouse at night is improved, and a good temperature environment is provided for the production of vegetable crops; 4) at present, the day-light greenhouse enterprises rarely consider the weather and climate conditions of construction sites during greenhouse design, the evaluation indexes of the good and bad thermal insulation performance of the day-light greenhouse can be provided through the determination of a day-light greenhouse thermal insulation performance test system, and the day-light climate conditions of the construction sites are considered during greenhouse design to force the greenhouse construction enterprises to determine the greenhouse structure, so that the day heat storage capacity and the night heat release capacity of the finished day-light greenhouse are balanced, the higher temperature level of the greenhouse is maintained, and a good temperature environment is provided for vegetable crop production.
Drawings
FIG. 1 is a schematic diagram of a greenhouse exotherm;
FIG. 2 is a schematic view of the arrangement of temperature measurement points according to the present invention;
fig. 3 is a schematic structural diagram of a display according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
The sunlight greenhouse heat preservation performance test system is designed on the basis of the temperature difference ratio and by taking the ratio of the through-flow heat release temperature difference to the convection heat transfer temperature difference in a period of time at night of the greenhouse as a quantitative index, and the sunlight greenhouse heat preservation performance test system is used for quantitatively measuring the height of the sunlight greenhouse heat preservation performance at night.
The invention relates to a solar greenhouse heat preservation performance test system, which consists of three parts, wherein the parts consist of the following components in part by weight:
temperature probe (data acquisition part)
Rear wall middle surface temperature (T)Rear wall) Middle part of greenhouse spanSurface temperature (T)Soil(s)) Air temperature (T) at the intersection of the extension line of the perpendicular line in the middle of the rear wall and the extension line of the perpendicular line in the middle of the greenhouse spanGreenhouse air) Outside air temperature (T) of greenhouseAir outside greenhouse) The specific arrangement of the measuring points is shown in figure 2.
Two, integrated chip
1. Data integration processing
1) Calculating T at night for a period of timeRear wall、TGround surface、TAir in greenhouse、TAir outside greenhouseIntegral value of (a ^ T)Rear wall、∫TGround surface、∫TAir in greenhouse、∫TAir outside greenhouse。
2) The integral value of the heat accumulator temperature is represented as ([ integral ] T)Rear wall*x+∫TGround surfaceY)/(x + y), x and y being the rear wall height and the greenhouse span, respectively.
3)(∫TRear wall*x+∫TGround surface*y)/(x+y)-∫TAir in greenhouseIs the convective heat exchange temperature difference on the basis of integral quantity, and the integral quantity of TAir in greenhouse-∫TAir outside greenhouseThe through-flow heat release temperature difference on an integral basis.
4)(∫TIndoor air temperature-∫TAir outside greenhouse)/[(∫TRear wall*x+∫TGround surface*y)/(x+y)-∫TAir in greenhouse]Is the integrated temperature difference ratio.
2. Data accumulation processing
1) Calculating T at night for a period of timeRear wall、TGround surface、TAir in greenhouse、TAir outside greenhouseIntegrated value of ∑ TRear wall、∑TGround surface、∑TAir in greenhouse、∑TAir outside greenhouse。
2) The accumulated value of the heat accumulator temperature is expressed as (Sigma T)Rear wall*x+∑TGround surfaceY)/(x + y), x and y being the rear wall height and the greenhouse span, respectively.
3)(∑TRear wall*x+∑TGround surface*y)/(x+y)-∑TAir in greenhouseFor convective heat transfer temperature difference on the basis of accumulationAir in greenhouse-∑TAir outside greenhouseOn an accumulated basisCross-flow exothermic temperature difference.
4)(∑TAir outside greenhouse-∑TAir outside greenhouse)/[(∑TRear wall*x+∑TGround surface*y)/(x+y)-∑TAir in greenhouse]To accumulate the temperature difference ratio.
Third, data display part (display)
The display consists of two parts, namely parameter input and result output, and is particularly shown in figure 3.
A structure input section: the greenhouse rear wall height (x) and the greenhouse span (y) are input.
A result output section: 1) the instantaneous temperature difference ratio is displayed. 2) And after the time period is input, displaying the integral temperature difference ratio and the accumulated temperature difference ratio.
The working principle of the invention is as follows:
the heat storage and release of the rear wall of the solar greenhouse and the soil are unsteady state heat conduction, the temperature of the rear wall and the soil is increased after the heat is stored, and the temperature is reduced after the heat is released; temperature variations, which are the extrinsic manifestation of heat flow, and heat flow, which is the intrinsic cause of temperature variations, are two aspects of a problem for unsteady state heat conduction. The working principle of the solar greenhouse heat insulation performance testing system comprises the following three steps:
1) the first step is as follows: representing temperature variation by exothermic variation
The less the heat released by the rear wall and the soil at night, the less the temperature drop of the rear wall and the soil, and the higher the night temperature level of the greenhouse. Since the rear wall surface temperature and the floor temperature are the basis for the formation of the greenhouse air temperature and have a linear correlation with the greenhouse air temperature, the higher the greenhouse air temperature will be.
2) The second step is that: representing the amount of heat released by a temperature difference
According to the Newton cooling law, the quantity of heat release is in positive linear correlation with the through-flow heat release temperature difference and the convection heat transfer temperature difference, the through-flow heat release temperature difference is used for representing the through-flow heat release quantity, and the convection heat transfer temperature difference is used for representing the convection heat transfer quantity.
3) Concept of temperature difference ratio
As the through-flow heat release of the greenhouse is basically equal to the sum of the convection heat exchange of the rear wall and the ground, the temperature difference ratio refers to the numerical value of the through-flow heat release temperature difference required for causing the convection heat exchange temperature difference of 1 ℃. The larger the temperature difference ratio is, the lower the outside temperature required by the back wall and the soil to release the same heat is; in other words, in the case that the air temperature outside the greenhouse is the same, the larger the temperature difference ratio, the smaller the convective heat transfer temperature difference causing the heat release of the rear wall and the soil, the smaller the heat release amount at night of the greenhouse, the smaller the temperature decrease, and the higher the temperature level of the greenhouse, so that the temperature difference ratio can reflect the heat preservation performance of the greenhouse.
The sunlight greenhouse heat insulation performance test system has a wide measurement range, can digitally express heat insulation performance of sunlight greenhouses with different latitudes, different altitudes, different spans, different heights, different wall thicknesses and different wall materials in the northern areas of China, and provides a unified and standard heat insulation performance evaluation index;
taking the Weifang city in Shandong province and the Kashi city in Xinjiang autonomous region as examples, when the sunlight temperature-room temperature difference ratio of the two cities is respectively more than 13 and 15, the heat release amount at night of the greenhouse is less, the heat preservation performance is higher, and the temperature level at night of the greenhouse is higher; if the night time temperature level of the greenhouse is still low, this indicates that the structure of the greenhouse is more problematic and needs to be improved.
The current solar greenhouse construction industry is mixed with fishes and dragons, more greenhouse construction enterprises construct the solar greenhouse as a building, the appearance structure of the solar greenhouse is emphasized, the use function of the solar greenhouse is ignored, and the heat insulation performance of the built greenhouse is generally low; the evaluation index can be provided for the good and bad heat preservation performance of the sunlight greenhouse through the determination of the sunlight greenhouse heat preservation performance test system, the greenhouse design is optimized for greenhouse construction enterprises, the construction quality is improved, the use function of the constructed greenhouse is improved, the night temperature level of the greenhouse is improved, and a good temperature environment is provided for the production of vegetable crops.
At present, the day-light greenhouse enterprises rarely consider the weather and climate conditions of construction sites during greenhouse design, the evaluation indexes of the good and bad thermal insulation performance of the day-light greenhouse can be provided through the determination of a day-light greenhouse thermal insulation performance test system, and the day-light climate conditions of the construction sites are considered during greenhouse design to force the greenhouse construction enterprises to determine the greenhouse structure, so that the day heat storage capacity and the night heat release capacity of the finished day-light greenhouse are balanced, the higher temperature level of the greenhouse is maintained, and a good temperature environment is provided for vegetable crop production.
The above-described embodiments of the invention are intended to be illustrative only and are not intended to be limiting, as all changes that come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (4)
1. The utility model provides a sunlight greenhouse thermal insulation performance test system which characterized in that: the temperature probe, the integrated chip and the data display part are included:
the temperature probe is used for acquiring the surface temperature of the rear wall, the ground temperature, the air temperature in the greenhouse and the air temperature outside the greenhouse;
the integrated chip is used for data integration processing and data accumulation processing; the data integration processing respectively carries out integration operation on the acquired data, calculates the through-flow heat release temperature difference and the convection heat transfer temperature difference, and calculates the integral temperature difference ratio; the data accumulation processing is to perform accumulation operation on the acquired data, wherein the temperature difference ratio at a certain moment is an instantaneous temperature difference ratio, and the temperature difference ratio in a certain period of time is an accumulated temperature difference ratio;
the data display part comprises a parameter input part and a result output part, and the parameter input part inputs the rear wall height and the greenhouse span of the greenhouse; the result output part directly displays the instantaneous temperature difference ratio; and after the time period is input, displaying the integral temperature difference ratio and the accumulated temperature difference ratio.
2. The solar greenhouse heat preservation performance test system of claim 1, characterized in that: the data integration process includes:
1) calculating T at night for a period of timeRear wall、TGround surface、TAir in greenhouse、TAir outside greenhouseIntegral value of (a ^ T)Rear wall、∫TGround surface、∫TAir in greenhouse、∫TAir outside greenhouse；
2) The integral value of the heat accumulator temperature is represented as ([ integral ] T)Rear wall*x+∫TGround surfaceY)/(x + y), x and y respectivelyThe rear wall height and the greenhouse span;
3)(∫Trear wall*x+∫TGround surface*y)/(x+y)-∫TAir in greenhouseIs the convective heat exchange temperature difference on the basis of integral quantity, and the integral quantity of TAir in greenhouse-∫TAir outside greenhouseIs a through-flow heat release temperature difference on the basis of integration;
4)(∫Tair-air in greenhouse-∫TAir outside greenhouse)/[(∫TRear wall*x+∫TGround surface*y)/(x+y)-∫TAir in greenhouse]Is the integrated temperature difference ratio.
3. The solar greenhouse heat preservation performance test system of claim 1, characterized in that: the data accumulation processing includes:
1) calculating T at night for a period of timeRear wall、TGround surface、TAir in greenhouse、TAir outside greenhouseIntegrated value of ∑ TRear wall、∑TGround surface、∑TAir in greenhouse、∑TAir outside greenhouse；
2) The accumulated value of the heat accumulator temperature is expressed as (Sigma T)Rear wall*x+∑TGround surfaceY)/(x + y), x and y being the rear wall height and the greenhouse span, respectively;
3)(∑Trear wall*x+∑TGround surface*y)/(x+y)-∑TAir in greenhouseFor convective heat transfer temperature difference on the basis of accumulationAir in greenhouse-∑TAir outside greenhouseThe through-flow heat release temperature difference is accumulated;
4)(∑Tair in greenhouse-∑TAir outside greenhouse)/[(∑TRear wall*x+∑TGround surface*y)/(x+y)-∑TAir in greenhouse]To accumulate the temperature difference ratio.
4. The solar greenhouse insulation performance test system of claim 1, 2 or 3, characterized in that: x is the back wall height, and y is greenhouse ground span, and rear wall surface temperature represents rear wall surface temperature in the inboard middle part of rear wall, and greenhouse span middle part temperature represents ground temperature, and the temperature of the junction of rear wall middle part perpendicular line extension line and greenhouse span middle part perpendicular line extension line represents greenhouse air temperature, and the air temperature of greenhouse rear wall outside middle part apart from rear wall 50cm represents greenhouse outside air temperature.
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Application publication date: 20210611 |