JP3375603B2 - How to measure the calorie of thermal barrier paint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention shields solar heat
The present invention relates to a method for measuring the calorific value of a paint. [0002] 2. Description of the Related Art The applicant of the present invention has previously received solar radiation.
Onshore and offshore structures, ships, buildings, cars, houses
Covers the outer surfaces of electronic products, etc., and suppresses the rise in internal temperature.
Reduce air conditioning costs or reduce evaporation of contents.
Reduce wear and expect remarkable effect on energy saving
As well as excellent long-term durability and environmental health issues
Without, it can be colored and has a beautiful appearance.
Even if the film thickness is not so large,
The effect can be demonstrated, and the color can be
It can have a wide range of colors, and is limited to black and gray.
Any color, even dark colors,
Invented a solar heat shielding paint that can also achieve clear colors,
This was filed as a patent application as Japanese Patent Application No. 11-17046. [0003] The solar heat shield disclosed in Japanese Patent Application No. 11-17046.
Shielding paints are all coating systems of top coat, middle coat, undercoat or electrodeposition.
All or all of top coat, middle coat, undercoat or electrodeposition
Of the coating system, apply the intermediate coating or partially coat except the top coating.
The pigment is composed mainly of pigment and vehicle, and the pigment is in the near infrared region.
Solar radiation defined by JIS A5759
A reflectance of 15% or more and CIE 1976
Organic system with L * value of 20 or less in L * a * b * color space
Or multiple organic and inorganic solar heat-shielding coloring pigments
The main point is to paint with a mixed solar heat shielding paint.
Things. [0004] According to this solar heat shielding paint, at the surface temperature
Has a remarkable effect.
Covers the exterior of the building for long periods of solar heat
Control the rise in internal temperature, improve air conditioning costs or
Suppresses evaporative consumption of contents, remarkable for energy saving
Solar heat-shielding paint and its coating that can be expected to be effective
It becomes possible and contributes to the development of industry.
There is something great. In addition to this, the film thickness must not be so large.
At least it can exhibit the specified solar heat shielding effect, and
By using pigments, it is possible to have a wide range of colors,
Furthermore, to any color without being limited to black and gray,
In addition, it is possible to realize dark colors and clear colors
It is. By the way, such a solar heat shielding paint is built.
If you paint on something and try to get the effect, how much
The amount of heat shielding can be obtained by painting
It becomes a problem. Greater heat shielding effect with less paint
It is because it is desirable to do. [0007] The solar heat shielding effect in the building
It can be captured as a chamber heat load. Cooling sensible heat load
Is the combined heat load created by the following factors:
It is total. (1) Heat flowing through wall due to temperature difference between inside and outside Wall area * Thermal transmission rate * Temperature difference between inside and outside (2) Heat flowing through the wall due to solar radiation Wall area * Heat transmission rate * Equivalent outside air temperature rise (3) Heat transmitted through windows due to solar radiation Window area * Window shielding factor * Incident solar radiation (4) Ventilation heat due to temperature difference between inside and outside Ventilation volume * 0.3 (specific heat of air volume) * Difference between inside and outside temperature (5) Heat generated in the building Equipment capacity (kw) * Usage rate * 860 Number of people * Occupancy rate * Human metabolism Of these, (1) and
This is the heat flowing through the wall of (2). [0008] (2) The calculation formula of the heat flowing through the wall due to solar radiation
Appearing equivalent outside temperature rise Δθ_eIs Where α is the solar absorptivity of the wall surface α. : Heat transfer coefficient of outer surface (ordinary value: 20.0 kcal / m)
²h ℃) J: incident solar radiation (kcal / m²h) The thermal effect of the incident solar radiation is that the outside air temperature is Δ
θ_eIt is equivalent to rising only.
This and the true outside temperature θ. Combined with
Degree θ_E" θ_E= Θ. + Δθ_E                (2) The heat flowing through the two walls (1) and (2) is considerable.
With the introduction of the outside air temperature, Where θ_U:Outside air temperature θ_R: Indoor temperature It is the usual way to calculate in the form. [0010] FIG. 6 shows a flow through the roof surface.
This shows a conventional example of a calorific value calculation method.
Of the solar radiation absorption rate α that appears in the conventional heat load calculation method
Has a fixed value of α = 0.8. This value
Assumes absorption rate of concrete or mortar
So far, the solar radiation absorption rate on the outer wall surface has been considered.
I didn't have much idea to control it graphically.
The values were applied to all building material surfaces and there was no problem.
You. However, Japanese Patent Application No. 11-17046 discloses
In the case of thermal barrier paints such as solar thermal barrier paints,
More rigorous treatment of absorption is needed
Was. [0012] The object of the present invention in view of such circumstances,
Calculates the calorific value load that matches the actual
Calorie of thermal barrier paint that can determine the effective heat flow reduction rate
It is an object of the present invention to provide a measuring method. [0013] The present invention achieves the above object.
In order to do this, after determining the paint color,
Measure the solar reflectance as defined in SA5759 and measure
The solar absorptance is calculated from the obtained solar reflectance, and this solar absorptivity is calculated.
Calculate the equivalent outside temperature from the following formula using the formula A,
In addition, the gist is to calculate the once-through calorific value by the following formula B.
Things. Formula A: Equivalent outdoor temperature = air temperature + solar radiation x solar radiation absorption rate / 20 Formula B: Heat flow through = K value x area x (equivalent outside temperature-room temperature) However, K value (heat flow resistance) is the heat flow rate of the material to be coated. According to the first aspect of the present invention,
For the solar absorption rate for which the value has been used,
Measure the emissivity and calculate from the measured solar reflectance
Paint, which occupies the outer surface of the building material.
It is possible to calculate the calorific load for thermal action
You. [0015] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Will be described in detail. FIG. 1 shows the effect of the thermal barrier paint of the present invention.
FIG. 2 is an explanatory view showing one embodiment of a method for measuring fruits, and FIG.
The sectional front view shows a method of calculating the amount of heat flowing from the roof surface. As shown in FIG. 1, the present invention relates to a paint color
After making the determination, the paint is defined in JIS A5759.
Measure the solar reflectance. And measured solar reflectance
Calculate the solar radiation absorption rate from Regarding the measurement of solar reflectance, JIS A5
759, using a spectrophotometer at a wavelength of 350 m
from m to 2100 mm at intervals of 50 mm
Spectral transmittance at the wavelength point (Rλ_i) To measure (²),Next
Calculate the solar reflectance by the formula or use a reflectometer
Directly to determine the solar reflectance. Where R_E: Solar transmittance (%) Eλ_i： Value of spectral distribution of solar radiation Rλ_i: Spectral reflectance However, if the spectral reflectance distribution curve shows a vibration waveform
The average distribution curve passing between the peaks and valleys
The spectral reflectance at each wavelength is calculated. note(²) Rλ_iWhen measuring the
Attach at 0 degree so that the specularly reflected light is captured by the integrating sphere
I do. To calculate solar absorptance from solar reflectance
Just take the reciprocal. For example, the solar reflectance β is β = 0.2
In this case, the solar absorptivity α is 0.8. (Figure 2 and
(See comparison in FIG. 6) Formula A based on the solar radiation absorption rate: Equivalent outside air temperature
Degree = temperature + solar radiation x solar radiation absorption rate / 20
calculate. Further, formula B: once-through heat = K value × area ×
The through heat is calculated from (equivalent outside air temperature-room temperature). However, the K value (heat flow resistance) depends on the material
Heat transfer coefficient of the root material)   1/20 External heat flow resistance (external transmission rate) [R0]             Heat flow resistance of coating film (thickness / thermal conductivity) [R1]             Thermal flow resistance (thickness / thermal conductivity) of steel plate (roof material) [R2]             Heat flow resistance of thermal insulation (thickness / thermal conductivity)   1/10 Internal heat flow resistance (internal transmission rate) [R3] 2 and 6, the external heat transmission resistance of R0 is 1
/ 20, and the heat flow resistance of the coating film of R1 is the thickness L of the coating material.
1 and the thermal conductivity of the paint, R2 steel plate
(Roofing material) has a heat transmission resistance of thickness L2 of steel plate (roofing material).
And the thermal conductivity of steel sheet (roof material).
If there is a thermal material, the thickness of the thermal insulation and the thermal conductivity of the thermal insulation are related.
), The internal heat flow resistance of R3 is 1/10. R
0 and R3 are fixed numerical values. The solar thermal shield disclosed in Japanese Patent Application No. 11-17046.
Based on the data of shielding paint (heat shielding paint) and general coating
In addition, case studies on the effect of solar radiation absorption rate on heat load
Tried Taddy. The table below shows the solar absorption data of various coatings.
1 [0024] [Table 1] The solar absorptivity data is based on JI
Measure the solar reflectance as defined in SA5759 and measure
The solar absorptivity was calculated from the obtained solar reflectance. Regarding the equivalent outside air temperature,
According to the Society's “Air Conditioning Sanitation Engineering Handbook”
The external weather conditions for cooling design are as shown in Table 2 below.
You. (Chapter 2 of the same book air-conditioning equipment). [0027] [Table 2]Based on Table 2 above, the roof (horizontal surface)
Equivalent outside air temperature when coating with the characteristics shown in Table 1 is applied
When the degrees are calculated, they are as shown in FIG. According to this result
And white have a high solar reflectance even with standard paint
It does not make a big difference from thermal coating, but it is black and gray
In the case of paint with an unusual color,
A considerable decrease in the outside air temperature of about 15 ° C. is observed. The heat flowing through the wall is calculated by the above equation (3).
Area 1000m²There is a horizontal roof, and this is the case
It is assumed that six types of surface paintings of Study 1 are applied. Roof structure
Is non-adiabatic (K = 8.00 kcal / m²h ℃)
Heat (heat insulation thickness: 50 mm, K = 0.503 kcal / m
²h.degree. C.). Room temperature is controlled at 26 ℃
It is controlled. Under the above conditions, the amount of heat flowing through the roof is determined.
Is as shown in FIG. As you can see at a glance,
Thermal barrier coating is not comparable to thermal insulation with a thickness of 50 mm.
Absent. However, when compared with general paint under the same heat insulation condition,
About 20% for white, 30-4 for gray and black
A decrease in the amount of heat flowing through by 0% (daylight time) is observed. The relationship between cooling load and natural temperature is 50
m, north and south 20m (floor area 1000m² ), Eave height 5m
Assuming a warehouse-like building, the roof is non-insulated and insulated,
-A total of 4 types of combinations of general paint and thermal barrier paint
I can. For the walls other than the roof, the same insulation as the roof,
The solar radiation absorption rate is 0.8. Next, the ventilation volume of this house
[M³/ H], the natural room temperature θ in the building_R[℃]
Is Here, Q: cooling heat load of the entire building [kcal / h] Right side denominator: Total heat transfer rate of the building [kcal / h ° C] Is obtained. The number of ventilation is 1, 10 [times / h]
In addition, the cooling load Q for the eight cases shown in Table 1
As a result of calculation, when looking at the ventilation rate l times / h,
20 to 25% reduction in cooling load at daytime
It has become. On the other hand, in case of 10 times / h ventilation
The temperature of the outside air is dominant.
Is relatively small. Still general painting + unapproved
The effect of about 5 ° C was seen with heat and thermal barrier coating + heat insulation. [0032] As described above, the heat of the thermal barrier paint of the present invention is
The method for measuring the amount of heat
To determine the exact rate of heat flow reduction.
Things.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing one embodiment of a method for measuring the calorific value of a thermal barrier paint according to the present invention. FIG. 2 is a vertical sectional front view showing one embodiment of the method for measuring the calorific value of the thermal barrier paint of the present invention. FIG. 3 is a graph of an equivalent outside air temperature. FIG. 4 is a graph showing a comparison of a once-through heat load from a roof surface. FIG. 5 is a graph showing natural room temperature. FIG. 6 is a vertical sectional front view showing a conventional example.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01N 25/18 G01N 21/27 JICST file (JOIS)

Claims (1)

(57) [Claims] [Claim 1] After determining the paint color, the solar reflectance of this paint defined in JIS A5759 is measured,
Calculating a solar absorptance from the measured solar absorptance, calculating an equivalent outside air temperature by the following equation A based on the solar absorptivity, and further calculating a once-through calorie by the following equation B A method for measuring the calorific value of paint. Formula A: Equivalent outdoor temperature = air temperature + solar radiation x solar absorptivity / 20 Formula B: once-through heat = K value x area x (equivalent outdoor temperature-room temperature) where K value (heat flow resistance) is the heat flow of the material to be coated. rate