GB2106230A - Cooling garments - Google Patents
Cooling garments Download PDFInfo
- Publication number
- GB2106230A GB2106230A GB08227052A GB8227052A GB2106230A GB 2106230 A GB2106230 A GB 2106230A GB 08227052 A GB08227052 A GB 08227052A GB 8227052 A GB8227052 A GB 8227052A GB 2106230 A GB2106230 A GB 2106230A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liquid
- heat exchanger
- reservoir
- lcg
- air inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 230000003750 conditioning effect Effects 0.000 claims abstract description 8
- 238000002844 melting Methods 0.000 claims abstract description 8
- 230000008018 melting Effects 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims abstract description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 21
- 239000012530 fluid Substances 0.000 description 12
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- KWOLFJPFCHCOCG-UHFFFAOYSA-N Acetophenone Chemical compound CC(=O)C1=CC=CC=C1 KWOLFJPFCHCOCG-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000011054 acetic acid Nutrition 0.000 description 1
- 150000001243 acetic acids Chemical class 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- HPXRVTGHNJAIIH-UHFFFAOYSA-N cyclohexanol Chemical compound OC1CCCCC1 HPXRVTGHNJAIIH-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B17/00—Protective clothing affording protection against heat or harmful chemical agents or for use at high altitudes
- A62B17/005—Active or passive body temperature control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D10/00—Flight suits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D10/00—Flight suits
- B64D2010/007—Suits with cooling or heating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
- F25D2400/26—Refrigerating devices for cooling wearing apparel, e.g. garments, hats, shoes or gloves
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Pulmonology (AREA)
- Toxicology (AREA)
- Aviation & Aerospace Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Professional, Industrial, Or Sporting Protective Garments (AREA)
Abstract
Apparatus for use with a crew liquid conditioning garment (LCG) and comprising: a reservoir (10) of liquid having a melting point between 15 DEG C and 30 DEG C; a reservoir heat exchanger (11) in the reservoir and associable with a LCG; a cabin air inlet heat exchanger (12); control means, and pump means (13), the apparatus being arranged so that when the cabin air inlet is operational liquid from its heat exchanger cools both the liquid in the reservoir and effects cooling by the LCG and in periods when the cabin air inlet is non-operational LCG cooling is effected from the reservoir heat exchanger. <IMAGE>
Description
SPECIFICATION
Improvements in or relating to heat sinks
The present invention relates to heat sinks, and is particularly concerned with a heat sink for use in personnel conditioning apparatus, especially aircrew conditioning garment apparatus.
Liquid conditioning garments (LCG's) are described in UK Patent Specification 992929 and 111 5414 and comprise a labyrinth of flexible tubes attached to a garment and adapted to be fed with cooled liquid to protect the wearer from environmental or work induced heat.
Various heat sinks have been proposed for use with LCG's. For example, one employing precooled ice is described in UK Patent Specification 1 376604, and another capable of supplying cooling or warming liquid as required is described in UK Patent Specification 1550351. The latter apparatus was especially developed for military aircraft use but incurs certain weight, bulk and cost disadvantages, the former, being a limited duration pack, is not as such suitable in many situations.
The present invention provides heat sink apparatus particularly suitable for use with vehicle crew, such as aircrew, conditioning suiting.
According to the present invention heat sink apparatus for use with a crew liquid conditioning garment comprises:
a reservoir of liquid having a melting point between 1 SOC and 30at; a reservoir heat exchanger in the reservoir and associable with a LCG;
a cabin air inlet heat exchanger;
control means, and
pump means,
the apparatus being arranged so that when the cabin air inlet is operational liquid from its heat exchanger cools both the liquid in the reservoir and effects cooling by the LCG and in periods when the cabin air inlet is non-operational LCG cooling is effected from the reservoir heat exchanger.
Liquids which have a melting point between 1 50C and 300C include glycerol, aceto-phenone,
cyclo-hexanol, and lactic and acetic acids. Glycerol
may be particularly suitable from the point of view of cost, relative non-flammability and non-toxicity
in the likely enviroments in the event of leakage.
It will be appreciated that it is intended that the
apparatus employs the latent heat of melting of the liquid of melting point between 1 50C and 300C. It may be advantageous for circumstances where cabin occupancy as such may precede
cabin air supply by a period for the liquid
employed in the LCG to have a melting point
slightly lower than that of the reservoir, e.g.
comprise a mixture of glycerol and water, so that
the LCG can be supplied to a user pre-frozen. The
LCG, the cabin air inlet heat exchanger and the
reservoir heat exchanger are preferably arranged
to provide in use a liquid continuum. The control
means, therefore, which may include a thermostat
and mixing valve, may be arranged to mix liquid emergent from the LCG with cooled liquid to arrive at the desired LCG inlet liquid temperature, which
may be of the order of 25"C. The control means may also include valve means for permitting liquid to
bypass the cabin air inlet heat exchanger when the
reservoir heat exchanger is being employed to
cool the liquid.
Heat sink apparatus in accordance with the
invention will now be described by way of
example with reference to the accompanying drawings, of which:
Figure lisa schematic diagram of the apparatus associated with a LCG, and
Figure 2 is a cross section of a cabin air inlet
heat exchanger.
The heat sink apparatus shewn in the drawings comprises a latent heat storage (glycerol) reservoir
10 incorporating a working fluid heat exchanger 1 a cabin air inlet heat exchanger 12, a pump
13, and control means including a mixing valve
14, a thermostat 15, and a2-wayvalve 16. A coupling 1 7 connects the apparatus with a liquid conditioned garment (LCG) 1 8 worn by an aircrewman in an aircraft cockpit. The mixing valve
14 includes a pressure relief valve, not shown.
The cabin air inlet heat exchanger 12 comprises, as shewn in Figure 2, a coiled liquid duct 20 having fins 21 and sited in an air inlet duct 22.
A description of the liquid circuit of the apparatus now follows. In the basic circuit the output of the pump 13 is connected via the 2-way valve 16, the tube 20 in the air inlet heat exchanger 12, the reservoir heat exchanger 11, the thermostat 15, the mixing valve 14, the coupling 17, the LCG 18 and back to the coupling, the valve 14 and the pump. The second output of the valve 1 6 is connected to the input of the heat exchanger 1 1.The output of the pump 13 is also connected to the thermostat 1 5 and to the valve 14, and the pressure relief valve in the mixing valve 14 is arranged to permit return flow to the pump when the LCG 1 8 is blocked.
The working fluid of the apparatus is a water glycerol mixture having a melting point of about 1 60C; that of gylcerol is about 200C. Thus the
LCG can be supplied to its wearer with its working fluid pre-frozen to about 1 OOC, and this can supply cooling to him for a preliminary standby period prior to flight.
During taxi and flight, with the pump 13 in operation, working fluid is pumped via the valve 16 through the air inlet heat exchanger 12, then through the heat exchanger 11 where it cools the fluid in the reservoir 10 all the while the inlet air temperature is sensibly lower than that of the reservoir fluid (it usually is in flight). From there it passes via the thermostat to the mixing valve 14.
If the fluid in the LCG has melted the mixing valve will pass fluid through it, but due to operation of the thermostat 1 5 will mix fluid from the heat exchanger 11 with fluid from the pump output in an effort to pass fluid to the LCG at a temperature no greater than 250C.
If after a flight the aircrewman has to stay with the aircraft for a further standby and environmental air is warm, the valve 1 6 will cause circulaiing fluid to by-pass the air inlet heat exchanger 1 2 and be cooled in the heat exchanger 11 by frozen glycerol in the reservoir 10.
It will be appreciated that what has been particularly described above is but one embodiment, and that for a military aircraft. The invention could equally be applied to a crew of any vehicle or even static installation without departing from the scope thereof. Moreover, the heat sink may, perhaps with the addition to the apparatus of a compressor and relocation of the pump, be employed as the heat sink to LCG's and other heat receivers constructed of comformable heat piping as described for example in copending UK Patent Applications 8106782 and 8129022-8.
Claims (6)
1. Heat sink apparatus for use with a crew liquid conditioning garment and comprising:
a reservoir of liquid having a melting point between 1 5 C and 300C;
a reservoir heat exchanger in the reservoir and associable with a LCG;
a cabin air inlet heat exchanger;
control means, and
pump means,
the apparatus being arranged so that when the cabin air inlet is operational liquid from its heat exchanger cools both the liquid in the reservoir and effects cooling by the LCG and in periods when the cabin air inlet is non-operational LCG cooling is effected from the reservoir heat exchanger.
2. Heat sink apparatus as claimed in claim 1 and wherein the liquid is glycerol.
3. Heat sink apparatus as claimed in claim 1 or claim 2 and wherein the control means includes a thermostat and mixing valve and is arranged to mix liquid emergent from the LCG with cooled liquid to arrive at the desired LCG inlet liquid temperature, which may be of the order of 25 C.
4. Heat sink apparatus as claimed in claim 3 and wherein the control means includes valve means for permitting liquid to bypass the cabin air inlet heat exchanger when the reservoir heat exchanger is being employed to cool the liquid.
5. Heat sink apparatus as claimed in any one of preceding claims and including a liquid conditioning garment, the garment cabin air inlet heat exchanger and the reservoir heat exchanger being arranged to provide in use a liquid continuum.
6. Heat sink apparatus substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08227052A GB2106230B (en) | 1981-09-25 | 1982-09-22 | Cooling garments |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8129050 | 1981-09-25 | ||
| GB08227052A GB2106230B (en) | 1981-09-25 | 1982-09-22 | Cooling garments |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2106230A true GB2106230A (en) | 1983-04-07 |
| GB2106230B GB2106230B (en) | 1986-08-28 |
Family
ID=26280809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08227052A Expired GB2106230B (en) | 1981-09-25 | 1982-09-22 | Cooling garments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2106230B (en) |
-
1982
- 1982-09-22 GB GB08227052A patent/GB2106230B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2106230B (en) | 1986-08-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |