Note: Descriptions are shown in the official language in which they were submitted.
CA 02672760 2009-07-23
SOLAR COFFEE/TEA MAKER AND COOKING APPLIANCES
FIELD OF TECHNOLOGY
[001] The present disclosure relates to solar heat application field,
especially related to
solar cooking appliances to cook the foods in the solar utensil that connects
to a solar heat
collector filled with heat storage and conducting material.
BACKGROUND
[002] For all kinds of existing energy sources in the earth, solar energy is
the most
widespread, the richest and the most uniformly distributed energy source.
Solar energy
can be used very easily. It is available every day, everywhere and for every
body.
[003] For all kinds of human energy consuming activities, food and beverage
cooking is
the most often activity and has the longest history. Every body in anywhere
needs to cook
the foods every day.
[004] It is very interesting and valuable topic to use solar energy for food
cooking.
There are many efforts in this field. (Please refer to the existing patents).
[005] The solar power on a unit earth area is not large. The solar radiation
intensity is
varied from North to South and from morning to afternoon. It depends on the
weather and
is also different in four seasons, so that to develop an economic solar
cooking appliance
is always a challenge and need continue efforts.
[006] In view of these difficulties, some solar cooking appliances -tried to
make the
sunlight receiving area as large as possible. But the heat insulation for the
received heat is
difficult. Some solar cooking appliances follow and focus the sunlight using
expensive
automation system and need additional power to run the system. Some solar
cooking
appliances also use the heat storage materials. The materials may be expensive
and not
easy to get.
[007] The present disclosure absorbs the historic experience and combines the
new solar
water heating technologies and developed a set of economic and practicable
solar
cooking appliances.
SUMMERY
[008] The object of this disclosure is to improve the existing technologies
and provide a
set of solar cooking appliances that is economy, easy to manufacture and use
and high
efficient. The invention takes following steps to overcome the difficulties of
applying
solar energy for food cooking:
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[009] To use the evacuated solar heat collector for optimum heat collecting;
[0010] To filled heat storage and conducting material in the evacuated solar
heat
collector for storing and keeping heat to provide a continue and stable
cooking heat;
[0011] A light reflector focuses the surrounding light to the cooking
appliances;
[0012] A sundial indicates the light direction, an adjustable and rotatable
fixing and
supporting trestle allows to receiving the highest solar power;
[0013] A electric power supply provides a backup power source when the solar
power
is not enough. Further more, the solar cooking appliances also provide backup
or energy
storage equipment at low electricity price period for cooking at electric
power outage.
[0014] Following are the detailed summary of present disclosure.
[0015] In accordance with one aspect of the present disclosure there is
provided a set of
solar cooking appliances, comprising: a solar heat collector in which heat
storage and
conducting material is filled, wherein solar heat is collected, stored in and
transferring
from; a heat insulated solar cooking utensil for food cooking inside, having
heat
connection with heat-transferring medium from said solar heat collector; a
heat-
transferring medium connected said solar heat collector to said cooking
utensil and
transferred the heat from said solar heat collector to said heat insulated
solar cooking
utensil; andnecessary accessories;
[0016] The said solar heat collector is an evacuated-tube solar heat collector
or a group
of modular evacuated-tube solar heat collectors that mounted in a shape, e.g.
row in
parallel, column in full or partial cone-shaped. The said solar heat collector
can be having
an open end extended into a heat insulated solar cooking utensil for heat
transferring; or
having two open ends; said one of two open end extended into a solar cooking
utensil; or
having two open ends; said one of two open end connected to a solar cooking
utensil by
said heat transferring medium; The said solar heat collector where in a heat
storage and
conducting material is partially filled in and a solar liquid reservoir is
arranged for water
or food oil heating; For safety reason a evacuated toughened-glass tube solar
heat
collector and a protective transparent cover is suggested;
[0017] The said heat storage and conducting material can be a solid material,
e.g. ore,
metal, quartz sand, basalt sand, salt or soil; or a liquid material, e.g.
water, oil, cooking
oil, or heat conductive grease; or a chemical head storage materials, e.g. CaO
plus H20; or
a combination material of two or more heat storage and conducting materials,
e.g. rape
oil filled in the quartz sand;
[0018] The said heat insulated solar cooking utensil can be a cooking utensil
with a heat
insulation coating; or a cooking utensil located in a heat insulated
container; or an
evacuated utensil made of either one of glass, metal, synthetic or ceramic; or
a cooking
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utensil located in a heat insulated container wherein heat storage and
conducting material
is filled; or a heat insulated electric power cooking utensil with operating
parameter
measuring, indicating and controlling devises and system; or a heat insulated
electric
power cooking utensil having conduit that arranged along inner wall of said
utensil from
the top to near bottom, having a fitting at the top for receiving a steam
conduit from the
solar heat collector, said steam conduit having one end extended into a hot
water
reservoir and not submerged in heated water within solar water collector.
[0019] The said heat-transferring medium can be a heat tube with or without
the
conducting fins, having its one end in said solar heat collector and another
end extended
into a said heat insulated solar cooking utensil; a water tube (including the
water steam)
having one end is submerged in said water reservoir within said solar heat
collector and
second end extended into a said heat insulated solar cooking utensil; a
cooking oil
conduit having one end is submerged in cooking oil of a cooking oil reservoir
within said
solar heat collector and second end extended into a said heat insulated solar
cooking
utensil; a medium that carries solar heat into said solar cooking utensil,
cooks said food
and becomes part of said food, e.g. water (including water steam) or food oil;
the heat
storage and conducting material in said solar heat collector; the heat storage
and
conducting material in said solar heat collector that connected or extended
into heat
insulated cooking utensil; the heat storage and conducting material in said
solar heat
collector that connected or extended into a heat insulated container, wherein
a cooking
utensil is located; a heat conductor, e.g. a copper bar or the wall of a metal
utensil;
[0020] The said necessary accessories can be a fixing and supporting trestle
that arrange
and support the each part of the solar cooking appliances at a proper
situation and allows
the adjustment to the incidence angle of the solar heat collector to the sun
light and
allows the adjustment to the direction of the solar heat collector to the sun
light, e.g. a
rotatable base; The said necessary accessories further comprise the light
reflecting object
that focus the surrounding sun light to the solar heat collector; a sundial,
e.g. a cone bar
attached to the solar heat collector perpendicularly for showing the angle of
sun light; a
bag and/or membrane for wrap up or cover the food in the solar cooking
appliance, e.g.
metal, paper or plastic bag and membrane.
[0021] The said accessories further comprses an electric power heat element
with power
supply including a measuring and indicating device for operating
characteristic
parameters of the solar cooking appliance, e.g. timing, temperature, pressure,
moisture;
and a controlling system for characteristic parameter of the solar cooking
appliance, e.g.
timing, temperature, pressure, moisture.
[0022] The said accessories comprise a suitcase, wherein the solar cooking
appliances
are arranged and packaged to form a potable solar cooking appliances
[0023] In accordance with another aspect of the present disclosure there is
provided a
solar coffee/tea pot comprising: a coffee/tea pot wherein the solar heated
water cooks the
coffee or tea, having a lid and a handle, a coffee and tea holder disposed
within said
coffee/tea pot, said coffee and tea holder having a punched coffee holder at
the upper and
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a punched tea basket with a removable cover at lower of the said pot; a hot
water shower
head at the lid; a conduit connected to the water shower head, passed through
and hidden
in the lid and the handle, said conduit having a end connected to a fitting at
a lower part
of the handle, said fitting is for receiving a hot water conduit from a solar
water heater;
[0024] The said coffee/tea pot can be a vacuum bottle made of stainless steel,
glass or
synthetic material and the punched coffee holder and tea basket can be
connected through
a stand and can be removed through the axis of the stand.
[0025] In accordance with another yet one aspect of the present disclosure
there is
provided a solar coffee/tea maker comprising: a coffee/tea pot with a lid and
a handle,
a coffee and tea holder disposed within said coffee/tea pot, said coffee and
tea holder
having a punched coffee holder at the upper and a punched tea basket with a
removable
cover at lower of the said pot; a hot water shower head at the lid, a tube
connected to the
water shower head and hidden in the lid and the handle, said tube having a
tube
connecting fitting at a lower part of the handle for receiving a hot water
tube from a solar
water heater; an airtight solar heated water container wherein the water is
heated by solar,
a hot water connecting conduit extending into said airtight solar heated water
reservoir,
having one end submerged in heated water of solar heated water container, the
opposite
end of said hot water connecting conduit is connected with said conduit
connecting fitting
at said handle of coffee/tea pot; and, necessary accessories;
[0026] The solar heated water reservoir, according to claim 43, that is a
evacuated-tube
solar heat collector; The solar heated water container is a water heater
located in an
evacuated-tube solar heat collector filled with heat storage and conducting
material; thee
coffee/tea pot is a vacuum bottle made of stainless steel, or synthetic
material; the
punched coffee holder and tea basket that are connected through a stand and
can be
removed through the axis of the stand.
[0027] In accordance with another yet one aspect of the present disclosure
there is
provided a solar/electric coffee maker mainly is heated by solar energy and
also heated
by electric power as a back up energy source, comprising: an electric drip
coffee maker
having cool water reservoir, coffee pot, electric power heated water tube;
first one-way
valve, hot water shower head; a hot water tube continued the electric power
heated water
tube carrying the hot water up to the drip area, said hot water tube having a
bypass tube
located upper the first one-way valve and electric heated water tube, but
lower the shower
head; a second one-way valve for preventing hot water flowing backward to
solar heat
collector, having one end connected to the end of said bypass tube and its
opposite end
connected to a connecting fitting at said electric drip coffee maker through
third tube;
said connecting fitting is for receiving a hot water tube from a solar water
heater; a third
one-way valve equipped at the hot water tube between the bypass and electric
power
heated tube for preventing hot water from solar heat collector flows toward
electric
heated tube; an airtight solar heated water container wherein the solar heat,
collected and
stored by a solar heat collector, heats the water directly or indirectly; a
hot water
connecting tube (fourth tube) extending into said airtight solar heated water
container,
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having one end submerged in heated water of solar heated water reservoir, the
opposite
end of said hot water connecting tube is connected with said tube connecting
fitting at
said electric drip coffee maker.
[0028] The solar heated water reservoir is an evacuated-tube solar heat
collector; the
Solar heated water container is a water container located in an evacuated-tube
solar heat
Collector wherein filled with heat storage and conducting material;
[0029] Other aspects and features of the present disclosure will become
apparent to
Those ordinarily skilled in the art upon review of the following description
of specific
Embodiments of the invention in conjunction with the accompanying figures.
BREIF DESCRIPTION OF THE DRAWINGS
[0030] In the figures which illustrate exemplary embodiments of this
invention:
[0031] Fig. 1 is a schematic diagram illustrating an exemplary solar
coffee/tea maker in
vertical section view;
[0032] Fig. 2 is a schematic diagram illustrating a solar/electric coffee
maker in vertical
section view;
[0033] Fig. 3 illustrates a set of exemplary solar heat collectors are
illustrated
Schematically in vertical sections;
[0034] Fig. 4 is schematic diagram of an alternative solar cooking appliance
that is
Illustrated in vertical section view;
[0035] Fig. 5 illustrates schematically a set of solar cooking appliances in
vertical
section view that uses a heat tube as the heat-transferring medium;
[0036] Fig. 6 illustrates schematically an alternative solar cooking appliance
in vertical
section view that transfers the solar heat by the direct connection between
the graphite in
solar heat collector and the graphite under a utensil;
[0037] Fig. 7 is a schematic diagram of a set of solar cooking appliances
including multi
Mounted solar heat collectors and utensils that is illustrated in a
perspective view.
DETAILED DESCRIPTION
[0038] Referring to Fig. 1, a schematic exemplary solar coffee/tea maker is
Illustrated in vertical section view.
CA 02672760 2009-07-23
[0039] The solar coffee/tea maker 100 includes a solar coffee/tea pot 160, a
solar heat
collector 110 and their connecting conduit 171. The solar heat collector 110
is filled with
heat storage and conducting material 120.
[0040] The solar coffee/tea pot 160 is a liquid container with a lid 162. In
this case it is a
vacuum glass bottle 161. But the stainless steel and synthetic material are
also often be
used. A coffee/tea holder 166 is disposed in the pot 160. The coffee/tea
holder 166 has its
lower part of tea basket 167 with removable lid 1671. The upper part of the
coffee/tea
holder 166 is a punched coffee holder 168. A stand 169 supports the coffee
holder 168
and tea holder 167. All three parts of coffee holder, tea holder and its lid
can be moved
through the axis 169. Based on the cooking requirement, either coffee holder
or tea
holder or both of them can be stayed in or removed out from the pot 160.
[0041] A hot water shower head 164 is arranged at the center of lid 162. A hot
water
conduit 163 passes through and is hidden in the lid 164 and the handle 165 of
the pot 160.
The hot water conduit 163 connects the water shower head 164 at one end. The
opposite
end of the hot water conduit 163 is connected to a fitting 170 that is at a
lower part of the
handle 165. The fitting 170 is for receiving a hot water conduit 171 from a
solar water
heater 110;
[0042] Solar heat collector 110 may be any kind of solar heat collector that
can heat the
heat storage and conducting material 120 to the temperature more than the
water boiling
temperature. In this case the solar heat collector 110 is an evacuated-tube
solar heat
collector. It may also is a group of modular evacuated-tube solar heat
collectors mounted
in a certain shape, e.g. in parallel row or in full or partial cone-shaped
column as of the
examples shown in Fig 7. The solar heat collector 110 has a removable part 114
with two
holes 1141 and 1142. The hole 1141 is a path for power cable 151 and air
exchange. The
hole1142 is to continue the hole 1311 for a hot water conduit 171 to go
through.
[0043] The evacuated-tube solar heat collectors110 has transparent outer layer
111 and
inner layer 112. It is evacuated in between. The inner layer 112 has a heat
absorbing
coating that does not show in the Fig 1. The evacuated-tube solar heat
collector 110 has
the same material and manufacture processing as the evacuated-tube solar heat
collector
that used for solar water heating. But the evacuated-tube solar heat collector
110 used in
solar cooking has a larger diameter and a shorter length comparing to the
regular
evacuated-tube for solar hot water.
[0044] The evacuated-tube solar heat collector 110 is made of glass. In case
the glass
tube is broken, the glass piece is dangers for the user. So the solar heat
collector 110 has
a transparent plastic cover for safety reason. (It is not shown in Fig. 1). If
the solar heat
collector 110 is a group of evacuated-tubes mounted in row, the transparent
plastic cover
may cover each tube or a plastic protective mantle may cover entire raw. But
the plastic
protective mantle may reduce the efficiency of the solar heat collector 110.
So an
evacuated toughened-glass tube solar heat collector is a better solution.
[0045] The evacuated-tube solar heat collector 110 is filled with a heat
storage and
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conduction material 120. The heat storage and conducting material 120 in this
case is salt
or stone sand for storing and transferring the solar heat to the water
container 130. In fact,
many kinds of the materials can be used as the solar heat storage and
conducting material.
For example, they are solid materials such as salt, sand, graphite and turves.
They can be
liquid material, such as water and oil including cooking oil and petroleum
products. They
also can be phase change material, such as paraffin. The combination of
different
materials, such as bean oil in quartz sand, is also a choice.
[0046] The water container 130 is a cylinder container located inside of solar
heat
collector 110 upper the heat storage and conducting material 120. It made of
stainless
steel. The cooking utensil 130 has a removable part 131 with a hole 1311, it
is a stopper
inserted in the cooking utensil 130. The utensil has a diameter near but not
bigger than
the inner diameter of the evacuated-tube110. A pleated structure 133 is on the
wall of the
container from the top to the bottom to provide a gap and patch for air
exchange and
power cable 151. Furthermore, it allows a minor adjustable diameter for the
container130. The cooking utensil 130 further includes a removable and
detachable
handle 134 at the inner wall for remove the utensil 130 from the solar heat
collector 110.
[0047] A removable part 114 covers the top of solar heat collector 110. It has
two holes
1141 and 1142. The first hole 1141 connects to said gap and path for air
exchange and
power cable. The second hole 1142 continues the hole 1311 in the stopper 131
of the
container 130.
[048] The electric heat element 150 with power supply is a very low power
electric heat
element. It located under the water container 130 and within heat storage and
conducting
material 120. A power cable 151 has very high resistive heat temperature that
connects
the electric heat element to power supply plug 152 outside of the solar heat
collector 110,
through the path formed by a pleated structure133 on the walls of the utensil
130. The
electric heat element 150 may further includes a measuring, indicating and
controlling
systems for the solar cooking appliances operating characteristic parameter,
e.g. timing,
temperature, pressure, moisture etc. These are not shown in Fig 1. The
electric heat
element with power supply can be removed from the set of cooking appliance. In
this
case the set of solar cooking appliances is still a complete cooking
appliances that use
solar heat as only energy source. Fig. 3 shows the solar heat collectors
without electric
heat element.
[0049] A hot water connecting conduit 171 is extended into said airtight solar
heated
water container through the holes 1142 and 1311. Its one end is submerged
under the
water level 135 in heated water container 130. The opposite end of said hot
water
connecting conduit 171 is connected with a conduit connecting fitting 170 at
said handle
165 of coffee/tea pot 160.
[0050] When the solar light 101 shines on the solar heat collector 110, the
solar heat
collector absorbs the solar heat and stores it in the sand 120. When the water
container
130 is put into the solar heat collector 110 and the cool water is poured in,
the solar heat
is transferred to the solar water container 130 through the inner wall 112,
heated sand 120
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and heats the water. The conduit 171's end 1711 is submerged under the water
level 135
in water container 130. The water container 130 is airtight. When the water is
heated to
boiling, the water steam gathered in the upper space of the container 130
forces the hot
water flows up the conduit 171 and 163. Then the hot water is dispersed to
drip evenly on
the coffee grounds waiting on the coffee holder 168 through the shower head
164. The
hot water picks up the coffee essence and down into the coffee bottle 161. A
coffee
making processing is completed. A similar processing can be used for making
tea. In this
case the tea or tea bag can be put in the tea basket 167.
[0051] We can also replace the water container by using the evacuated-tube 110
itself.
In this case, there are no water container 130, its stopper 131 and heat
storage and
conducting material 120 inside of the solar heat collector 110. The removable
part 114
needs to make the collector 110 becomes an airtight container. When the solar
heats the
water in the evacuated tube 110 to boiling, the water steam in the evacuated
tube 110
presses the water upward and through the conduit171 and 163 to make coffee. In
this
case the speed and quantity of coffee making are dependent on the real time
solar power.
It may be not continued and stable. When we use the water container 130
located in a
evacuated tube 160 filled with heat storage and contacting material 120, we
can use the
stored heat to make coffee and tea at any time continuously and stably.
[0052] When the solar heat is not enough for cooking, electric element 150
heats the
water container inside of the solar heat collector 110. Because the tube 110
has very good
heat insulation feature, so the required electric power is very low. In this
case, the
electricity has very high cooking efficiency.
[0053] Based on the idea of a solar coffee/tea maker mentioned above and in
Fig. 1, a
solar/electric coffee maker can be easily manufactured by making a minor
change to an
electric heated drip coffee maker or by reequipping a existing electric heated
drip coffee
maker. Referring to Fig. 2, a schematic solar/electric coffee maker 200 is
illustrated in
vertical section view. To make the description simpler, the solar heat
collector 110
including the filled heat storage and conducting material 120, the solar water
boiler 130
and the connection conduit 171 are the same as mentioned in Fig. 1.
[0054] An electric coffee maker 260 has its cool water reservoir 261, electric
heated
tube 262, hot water tube 263, hot water shower head 264, punched coffee holder
265,
coffee pot 266 and first one-way valve 267. These parts mentioned above are as
the
regular parts that any electric drip coffee maker may have. Comparing to the
regular
electric drip coffee maker, the major changes of a solar/electric coffee maker
are as
follows:
[0055] A hot water tube 263 continues the electric heated tube 262 and leads
the water
up from the base of reservoir 261 to the drip area265. This hot water tube 263
has a
bypass tube 268 located upper the first one-way valve 267 and electric heated
tube 262,
but lower the shower head 264;
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[0056] A second one-way valve 270 for preventing hot water flowing backward to
solar
heat collector 110 is added. Its one end connects to the end of said bypass
tube 268 and
its opposite end connects to a connecting fitting 269 at said electric drip
coffee maker 260
through third tube 272. The connecting fitting 269 is for receiving a hot
water tube 171
from a solar water container 130.
[0057] A third one-way valve 273 is equipped at the hot water tube 263 between
the
bypass 268 and electric heated tube 262 for preventing hot water from solar
heat collector
flows toward electric heated tube 162;
[0058] A hot water connecting conduit 171 is extended into said airtight solar
heated
water container 130 through the holes 1142 and 1311. Its one end is submerged
under the
water level 135 in heated water container 130. The opposite end of said hot
water
connecting conduit 171 is connected with said conduit connecting fitting 269
at electric
drip coffee maker 260.
[0059] When the solar light 101 shines on the solar heat collector 110, the
solar heat
collector absorbs the solar heat and stores it in the heat storage and
conduction material
120. When the water container 130 is put into the solar heat collector 110 and
the cool
water is poured in, the solar heat is transferred to the solar water container
130 through
the inner wall 112, heat storage and conducting material 120 and heats the
water. The
conduit 171's end 1711 is submerged under the water in the water container
130. The
water container 130 is airtight. When the water is heated to boiling, the
water steam
gathered in the upper space of the container forces the hot water flows up the
conduit 171
and 263. Then the hot water is dispersed to drip evenly on the coffee grounds
waiting on
the coffee holder 165 through the shower head 264. The hot water picks up the
coffee
essence and down into the coffee port 266. A coffee making processing is
completed.
When solar heat collector 110 works, the added one-way valve 273 prevents the
water
flows toward electric heated tube 262.
[0060] When the solar energy is not enough, plug the electric heated tube 162.
The cool
water from 261 flows through the first one way valve 267 and is heated in
electric heated
tube 262 until boiling. The bubble in boiled water forces the hot water up to
the shower
head 264 through hot water tube 263 to make coffee. The processing is the same
as the
processing in any kind of electric drip coffee maker.
[0061] When solar heat collector 110 works, the one-way valve 273 prevents the
water
flows toward electric heated tube 262. When electric drip coffee maker 260
works, the
added one-way valve 272 prevents the water flows toward solar heat collector
110. If
necessary, two heating sources also can work together.
[0062] As mentioned in Fig. 1, an empty solar heat collector tube 110 can
replace the
hot water container 130 to heat the water and make coffee.
[0063] Refer to Fig. 3, a set of exemplary solar heat collectors are
illustrated
schematically in vertical sections.
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[0064] Fig. 3 A is a schematic vertical section view of an evacuated-tube
solar heat
collector filled with liquid heat storage and conduction material, e.g. water
or oil. In some
cases, water can also be a heat transferring medium for food cooking.
[0065] Fig. 3 B is a schematic vertical section view of an evacuated-tube
solar heat
collector filled with solid heat storage and conduction material, e.g. ore
stone or turves.
[0066] Fig. 3 C is a schematic vertical section view of an evacuated-tube
solar heat
collector filled with sand and having a heat tube or a heat conductor as the
heat
transferring medium.
[0067] Fig. 3 D is a schematic vertical section view of an evacuated-tube
solar heat
collector filled with a combination of solid and liquid heat storage and
conducting
materials, e.g. quartz sand and cooking oil;
[0068] Fig. 3 E is a schematic partial vertical section view of a group of
modular
evacuated-tube solar heat collectors that mounted in a vertical parallel raw;
[0069] Fig. 3 F is a schematic partial vertical section view of a group of
modular
evacuated-tube solar heat collectors that mounted in a horizontal parallel
raw;
[0070] When set up a solar cooking appliance, not only these kinds of solar
heat
collectors but also more kinds of their varieties and combinations can be
selected and
used.
[0071] Refer to Fig.4 an alternative solar cooking appliance (steamer) is
illustrated
schematically in vertical section view.
[0072] Once again, to make the description simpler, the solar heat collector
110
including the filled heat storage and conducting material 120, the solar water
boiler 130
and the connection conduit 171 are the same as mentioned in Fig. 1.
[0073] The utensil 460 now is a food steamer with a heat-insulated lid 462.
The side
wall of the utensil 460 is heat insulated by a heat insulation coat 461. Three
layers of
steam basket 468 are arranged in the utensil 460 upper the bottom464. The food
is
cooked by water steam. A steam tube 463 is arranged inside the utensil from
the top to
near bottom along the internal wall of the steamer 460. The tube 463 connects
to a
connection fitting 465 at the heat insulation coat 461.
[0074] The connecting conduit 171 has one end 1711 connects to the connection
fitting
465. The opposite end 1712 of the connecting conduit 171 is extended into the
hot water
container 130 and at the upper of the water lever 135.
[0075] When the solar light 101 shines on the solar heat collector 110, the
solar heat
collector absorbs the solar heat and stores it in the heat storage and
conduction material
CA 02672760 2009-07-23
120. When the water container 130 is put into the solar heat collector 110 and
the cool
water is poured in, the solar heat is transferred to the solar water container
130 through
the inner wall 112, heat storage and conducting material 120 and heats the
water to
boiling. The water steam generated in the container 130 up to the utensil 460
through the
tubes 171, 463 and 467 to cook the food in 460.
[0076] Fig.5 illustrates schematically a set of solar cooking appliances 500
in vertical
section view that uses a heat tube as the heat-transferring medium.
[0077] The solar heat collector 510 is a group of 5 modular evacuated-tube
solar heat
collectors that mounted in a row. The number of the modular evacuated-tubes in
this case
is 5, but it can be changed based on the cooking requirement. The solar heat
collector 510
is filled with turves 520 in both converge tube 516 and the evacuated tubes
511, 512,513,
514 and 515.
[0078] The cooking utensil 561 is located in a heat insulation greatcoat 562.
It has a two
layer glass lid 563 with a hole 5631. In the bottom wall of the utensil 561, a
fitting 565 is
arranged for receiving a heat tube 530 from the solar heat collector 510.
[0079] A heat tube 530's one end is intended into the converge tube 516. The
opposite
end 531 of the heat tube is inset the fitting 565 in the cooking utensil 561.
The two end
of the converge tube 516 are closed and heat insulated.
[0080] When the solar heat collector 510 is working, the evacuated tubes
absorbs the
heat and stores it in the turves in the solar heat collector 510. The heat
tube 530 transfers
the solar heat to the cooking utensil 561 for food cooking. After cooking, the
cooking
utensil 561 is took out from the heat insulation greatcoat and is replaced by
a heat
insulation mass. It is to keep the solar cooking system in a high working
temperature for
next cooking.
[0081] illustrates schematically an alternative solar cooking appliance 600 in
vertical
section view that transfers the solar heat by the direct connection between
the graphite
620 in solar heat collector 610 and the graphite under a utensil 661.
[0082] The solar heat collector 610 is an evacuated-tube solar heat collector.
The solar
heat collector 610 is filled with graphite.
[0083] The cooking utensil 661 with a lid 663 is located in a heat insulation
greatcoat
662 with a lid 664. There is a space 665 between the bottom of the cooking
utensil 661
and the greatcoat 662. It filled with graphite too. The end of the evacuated
tube 610 is
extended into the space 665. The graphite 620 in solar heat collector 610 and
in the space
665 are connected closely.
[0084] When solar heat collector works, the collected solar heat is
transferred from the
graphite in the evacuated tube to the graphite in the space 665. The solar
heat cooks the
food in the cooking utensil 661. At some cases for a faster transferring of
the solar heat, a
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CA 02672760 2009-07-23
heat conductor may add in between the solar heat collector 610 and the space
665. It also
may be a heat tube.
10085] Usually the evacuated-tubes mounted in a raw for cooking several foods
at the
same time.
[00861 Refer to Fig. 7, a set of solar cooking appliances 700 is illustrated
schematically
in perspective view and vertical section view, respectively.
Five evacuated tube solar heat collector 701, 702, 703, 704 and 705 are
mounted in a
parallel raw illustrated in perspective view. Five cooking utensils including
coffee/tea
makers 160, 260, 460, 560 and 660 are put at one side of the solar heat
collector 710 and
are illustrated in vertical section view. Each solar heat corrector is filled
with different
heat storage and conducting material and has different way to connect the
utensil as the
descript of Fig. 1, Fig. 2, Fig. 4, Fig. 5, Fig. 6. For limitation of the
paper size, the
connections between the solar heat collectors and the utensils are not shown
in Fig. 7.
[0087] A fixing and supporting trestle 706 arranges and supports the five
solar heat
collectors at the proper locations and situations. The movable support 707
allows a
adjustment of the incidence angle of the solar heat collector 710 to the sun
light. Four
wheels 741, 742, 743 and 744 are installed in the four bottom corners of the
supporting
trestle 706 for adjust the direction of the solar heat collector 710. (743 and
744 are not
shown in Fig.7). A sundial (not shown in Fig. 7) is a cone bar. It attaches to
the solar heat
collector 710 perpendicularly for indicating the incidence angle of sun light;
[00881 A light reflecting object (not shown in Fig. 7) is equipped under the
evacuated-
tube for focusing the surrounding sun light to the solar heat collector;
When the solar light shines on the solar heat collector 710, the cooking
processing in
each utensil is the same as the processing mentioned in Fig. 1 to Fig.6. These
processing
will not be repeated again.
[0090] Based on the detailed description of the samples, other modifications
will be
apparent to those skilled in the art and, therefore, the invention is defined
in the claims.
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