|Title of Invention||
"AN INSULATING BLOCK"
|Abstract||An insulating block comprising an inner layer such as herein described; an outer layer such as herein described; an intermediate layer made of a bag made of a high density polymer (HDP) and containing a liquid having a viscosity in the range of 0.05 to 500 poise.|
|Full Text||- 1A -FIELD OF THE INVENTION
This invention relates to insulating building block. In particular, building blocks which act like a passive thermal storage.
OBJECTS OF THE INVENTION
An object of this invention is to propose an insulating block
which acts like a passive thermal storage.
Another object of this invention is to propose an insulating block which acts like a passive thermal storage and avoids the necessity of painting the outer surface block.
Sti11 another object of this invention is to propose an insulating block which sets like a passive thermal storage and provides a smoother distribution of thermal flow.
Yet another object of this invention is to propose an insulating block which acts like s passive thermal storage and has a high heat energy retention capacity.
Further objects and advantages of this invention will be more apparent from the ensuing description.
BRIEF DESCRIPTION OF THE INVENTION
According to this invention is provided an insulating building block comprising an inner and outer layer made each of binder and fine aciareciate mortar with an mnernieai ste layer comprising a bag made of a polymer with a liquid of high specific heat contained
therein. Other materials which change there states at a temperature , corresponding to the average day temperature, can also be used. Chlorinated wax, which is also a fire retardant, can be a good choice for this purpose. The binder may be material such as cement, flyash, etc. and the fine aggregate mortar may be sand mortar.
In accordance with this invention, when the outer layer of the block is exposed to solar radiation, the outer layer will absorb heat due to radiation. The absorbed heat will travel inward by conduction through the wall and by radiation and convection through the space. The outer layer of the block is connected to the inner 1ayer at al1 four edges through which most of the heat energy will transfer. This heat raises the temperature of the liquid in the bag in the middle layer. Since the liquid has high specific heat, the amount of heat energy retention capacity for the liquid will be highest. When a material changes its state (say solid to liquid), it absorbs latent heat without increasing its temperature. thus, it is possible to retain maximum amount of heat if the material ch anges its state at a temperature that corresponds to average temperature of the day at a particular place. The 1iquid used in the bag will stabi1ise the spikes in the outer temperature to provide a smoother distribution of thermal flow. At night, when the inner side of the house is cold, the stored thermal energy flows inside to warm the inner environment. Since outside ambient temperature is also low, the
stored heat will flow in both directions. To make the heat flow inward more, the inner 1iquid bag will be placed with some eccentricity sO that the inner wall is thinner than the outer wall. If needed, a coat of black paint can be provided in the outer surface of the liquid bag facing the inner house. The viscosity of the 1iquid can vary from 0.5 to 500 poise. The outer layers of the block is of cement/flyash composite. When flyash is used, the reaction slows down. To make up this, a hot water bath will accelerate the whole process of curing.
The characteristics of the middle layer is to absorb msximum possible heat from solar radiation. This will negate the necessity for painting with black at the outer surface. Solar radiation is absorbed by the liquid bag and stored as sensible heat in the wall. The heat energy transfers due to conduction through the wal1 and by radi ation and convection through the space. This transfer can be almost immediate or can be delayed depending on the depth and time lag property of the storage material chosen. The heat flux entering through concrete-liquid— concrete is greater than concrete-liqid-insulation, or insulation-liquid — concrete. The heat loss/gain due to air ventilation is significant because it directly replaces room air by ambient air.
The invention will now be explained in greater detail with the help of the accompanying drawings where
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Fig.1 shows a block according to the invention, where L represents the length of the block, W is the width and D, the dept of the block. The block (1) comprises the inner layer (2) and outer layer (3). The middle layer comprises the bag filled with liquid (4). The outer wall (5) of the bag is painted block and the top edge (6) of liquid bag is at an angle.
Fig.2 shows shows the input-output temperature variation across a
layered insulating building block when input temperature is
raised to 100 and 650 C. There exist a number of sharp variation
in the input end of the block but the output end is smooth.
The blocks are cured in a hot water bath where tempeature variation would be as shown in Fig.3. This accelerates the curing, as a result the block will achieve most of its strength within 48 hours.
Blocks are also tested for their compressive strength. The ultimate strength of the blocks art found to have much more than what will be needed during its service life. Present development will cut the surges/fluctuations present in the ambient environment and will provide a smoother environment. LIBB will also act as sn insulating medium. When used in the external wall making, will reduce energy consumption for cool ing during the summer and heating during the winter months.
1. An insulating block comprising
an inner layer such as herein described,
an outer layer such as herein described;
an intermediate layer made of a bag made of a high density
polymer (HDP) and containing a liquid having a viscosity in
the range of 0.05 to 500 poise.
2. The Insulating block as claimed In claim 1 wherein said inner layer is
made of a binder and fine aggregate mortar such as cement, flyash and
3. The insulating block as claimed in claim 1 wherein said Inner layer Is
made of material such as cement, ftyash and mortar.
4. The insulating block as claimed in claim 1 wherein a fire retardant such as
chlorinated wax Is optionally used In the outer and Inner layers.
5. The insulating block as claimed in claim 1 wherein said polymer is a
6. The Insulating block as claimed in claim 1 wherein said liquid in the middle
layer Is water.
7. The insulating block as claimed in claim 1 wherein the outer walls of the
bag are painted in black.
8 The Insulating block as claimed in claim 1 wherein said block is cured in hot water bath over a period of upto 4 hours at a temperature in the range
of 20 to 100°C.
9. The insulating block substantially as herein described and illustrated with reference to the accompanying drawings.
An insulating block comprising an inner layer such as herein described; an outer layer such as herein described; an intermediate layer made of a bag made of a high density polymer (HDP) and containing a liquid having a viscosity in the range of 0.05 to 500 poise.
|Indian Patent Application Number||704/CAL/2000|
|PG Journal Number||10/2007|
|Date of Filing||21-Dec-2000|
|Name of Patentee||INDIAN INSTITUTE OF TECHNOLOGY|
|Applicant Address||AN INDIAN INSTITUTE OF KHARAGPUR 721 302|
|PCT International Classification Number||E04C -1/41|
|PCT International Application Number||N/A|
|PCT International Filing date|