GB2505411A - Air conditioning system comprising a cold object for cooling air - Google Patents
Air conditioning system comprising a cold object for cooling air Download PDFInfo
- Publication number
- GB2505411A GB2505411A GB1215210.4A GB201215210A GB2505411A GB 2505411 A GB2505411 A GB 2505411A GB 201215210 A GB201215210 A GB 201215210A GB 2505411 A GB2505411 A GB 2505411A
- Authority
- GB
- United Kingdom
- Prior art keywords
- air
- temperature
- freezer
- cooled
- cold object
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
As part of an air conditioning system, a material is used to reduce the temperature of air, where a cold object is cooled or frozen and air is then passed over it in order to reduce the temperature of a room. Preferably, the material has a high thermal conductivity running through it, to absorb energy from the air as quickly as possible, and thus increase the speed at which the air passing over or through the cold object is cooled. In use, the cold object could be placed in a home freezer and, once cooled, removed from the freezer and placed in front of a fan. The cold object may be shaped to slot into a freezer drawer and then be transferred from the freezer for attachment to the front of the fan. Preferably, the material comprises water or ice.
Description
CoolFan This invention relates to an energy efficient way of cooling a room.
Background
Many residences, in particular energy efficient flats that have been built in recent times, can get particularly hot in summer. Methods used to make the living space more comfortable include 1. Using a simple fan This is a very simple and effective way of feeling cool, but doesn't actually reduce the temperature of the room 2. Using a water-cooled fan This method of cooling passes air over water, which is cooled through energy being taken from the air by evaporative cooling. This does cool the air, but is not a fast way of cooling the air and has the effect of increasing the amount water vapour within the air, increasing humidity.
3. Using a traditional air conditioning system The traditional air conditioner is a heat engine that cools the air by rapidly expanding an inert gas, which absorbs the heat in the air passing next to it. The gas is then compressed, with the heat created by compression expelled through a pipe.
The benefit of this system is that the cooling is instant. The downsides are that:- * The compressor can create a lot of noise in many cases * The process is very inefficient, taking a lot of energy and cost to run the air conditioner.
* The pipe used to expel the hot air side product has to be hung out of a window, which can be unsightly and depending on the location of the flat may be quite loud.
Statement of Invention
To overcome the issues described above, the present invention proposes a more energy efficient method of designing an air conditioning system.
Carnot's theorem states that the maximum efficiency of a heat engine is governed by the following formula:-tlmax = 1 -TC/TH = (TH -Tj/TH where T, is the temperature of the cold reservoir TH is the temperature of the hot reservoir Using the above formula, it can be seen that as TH -0 L the more efficient the heat engine becomes. Therefore cooling an object slowly before it is used to reduce the temperature of air passing over it will be more efficient than cooling an object instantly (such as the expanding gas in a traditional air conditioner).
An example of how to achieve this could be that an object could be placed in a traditional home freezer. As the object cools, its temperature will reduce and therefore become closer to the temperature of the freezer. As the object's temperature approaches the temperature of the freezer, the energy required to cool it further decreases. The object, once cooled, would then be removed from the freezer and placed in front of a fan which would disburse adjacent cooled air around the room.
Preferably, the object to be cooled would be of a shape that easily slotted into an average freezer drawer and could easily be transferred between freezer and fan. Additionally the invention should be designed so that the transferred object would easily attach to the front of the fan.
Preferably, you would have thermally conductive materials to absorb energy from the air as quickly as possible, as the fan blows the air over the cooled material.
Preferably, you would choose a material to cool that requires a large amount of energy to absorb from the air before reaching ambient temperature. This could be done by choosing a material with a high specific heat capacity, and also a high latent heat of fusion, with the melting point of the object being between -15°C and 25°C so that melting is required.
Another way of achieving this gradual cooling would be to have a refrigeration unit built into the fan unit. This could then refrigerate overnight, and avoid the need to transfer objects between a freezer and the fan.
Again, preferably you would use a material for cooling with the same properties as above, and also have a conductive material to cool the air as fast as possible.
Worked example
Say the dimensions of a typical bedroom in an energy efficient flat is 4m * 4m * 2.5m, giving a total volume of air of 40m3. We will use generic workings for in3 and then apply to these dimensions.
Energy required to reduce temperature of 1m3 air The energy required to be removed from air = [mass * specific heat * temperature fall] Assumptions @20°C Density of air = 1.205 Kg/rn3 and therefore mass = 1.205kg @40°C Density of air = 1.127 Kg/rn3 and therefore mass = 1.127kg Specific heat of air between temperatures of -50°C and 40°C (all relevant temperatures) = 1.005 kJ/kg/°C There room is a closed system i.e. no energy escapes or enters the room.
Workings Energy required to be removed @20°C = 1205kg * 1.005 kJ/kg/°C = 1.211 kJ/°C @40°C = 1.127 kg * 1.005 kJ/kg/°C = 1.133 kJ/°C We will use 20°C figure for prudence in our calculations, and therefore the energy to be removed from the air will be 1.211 kJ/°C/m3.
Cooling material There are five characteristic priorities I have identified for the cooling material to be used 1. Non-toxic (bits won't flake into the air etc.) 2. Melting point between -15°C and 25°C 3. High Latent heat of fusion 4. High specific heat 5. High conductivity (or good method of heat transfer between air and material) Basically, we need a material that requires the maximum energy to change temperature from the temperature within a freezer (-18°C), to comfortable room temperature (i.e. 20°C) Water appears to be a good candidate for a material to use (there may be better materials identified in the future), and therefore we will use water in our worked example.
Energy to transfer from air to material = [mass * specific heat of cooling material * temperature fall] + [mass * latent heat of melting (if the cooling material changes state as part of the cooling process)] Assumptions Specific heat capacity of water = 4.186 kJ/Kg/°C Specific heat capacity of ice (@-20°C, but assume constant) = 1.97 kJ/Kg/°C Latent heat of melting/fusion = 334 kJ/Kg/°C Assume freezer temperature of -18°C Assume reduction in room air temperature required is 10°C (from 30°C to 20°C) Workings 1. The temperature of the material must rise 18°C as Ice 2. Must melt 3. Must rise 20°C as water Therefore, energy required = 1. 1.97 * 18°C = 35.46 kJ/Kg 2. = 334 kJ/Kg 3. 4.186 * 20°C = 83.72 kJ/Kg Total = 453.2 kJ/Kg
Summary
Using the bedroom example of a 40m3 room, energy required to reduce the temperature from 30°C to 20°C:- 40m3 * 10°C * 1.211 kJ/°C/m3 = 484 ki Applying the above cooling material calculation implies we would need:- 484 ki / 445 kJ/Kg = 1.068 Kg water/ice Bringing back in the size dependency, we would require 26.7 g water/ice per m3 of room that required cooling.
Claims (2)
- Claims 1. The material used to reduce the temperature of air, as part of an air conditioning system where air is passed over a cold object, should be cooled/frozen prior to air being passed over it to reduce the temperature of the room.
- 2. The material, as referred to in claim 1, should have another material, which may be the same as the cooled material, with a high thermal conductivity running through it, to increase the speed at which the air passing over/through the object is cooled.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1215210.4A GB2505411A (en) | 2012-08-27 | 2012-08-27 | Air conditioning system comprising a cold object for cooling air |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1215210.4A GB2505411A (en) | 2012-08-27 | 2012-08-27 | Air conditioning system comprising a cold object for cooling air |
Publications (2)
Publication Number | Publication Date |
---|---|
GB201215210D0 GB201215210D0 (en) | 2012-10-10 |
GB2505411A true GB2505411A (en) | 2014-03-05 |
Family
ID=47045434
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1215210.4A Withdrawn GB2505411A (en) | 2012-08-27 | 2012-08-27 | Air conditioning system comprising a cold object for cooling air |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2505411A (en) |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1874843A (en) * | 1931-07-13 | 1932-08-30 | Adler Safety Control Company | Air cooling attachment for electric fans |
JPS58224242A (en) * | 1982-06-22 | 1983-12-26 | Tomoji Tanaka | Simplified cooler |
US4860556A (en) * | 1988-08-17 | 1989-08-29 | Hammett Rawlings H | Air cooling and directing apparatus |
US4879880A (en) * | 1989-01-17 | 1989-11-14 | Frank Harrison | Air temperature regulator |
EP0534018A1 (en) * | 1991-09-24 | 1993-03-31 | Ragaiy Georg Habeeb | Air-conditioning device |
CN2224984Y (en) * | 1995-05-25 | 1996-04-17 | 向乐元 | Air cooling device of electric fan |
US5860293A (en) * | 1997-06-16 | 1999-01-19 | Piro; Mathew P. | Air cooling apparatus including fan and cooling pack |
CA2254718A1 (en) * | 1998-12-01 | 2000-06-01 | Kelly Duchesne | Method of cooling air circulated by a fan and a cooling fan |
GB2428783A (en) * | 2005-08-05 | 2007-02-07 | Stanley George Austin | Fan having an auxiliary cooling device |
US20100126199A1 (en) * | 2008-11-21 | 2010-05-27 | Toan Trieu | Cooling Device |
-
2012
- 2012-08-27 GB GB1215210.4A patent/GB2505411A/en not_active Withdrawn
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1874843A (en) * | 1931-07-13 | 1932-08-30 | Adler Safety Control Company | Air cooling attachment for electric fans |
JPS58224242A (en) * | 1982-06-22 | 1983-12-26 | Tomoji Tanaka | Simplified cooler |
US4860556A (en) * | 1988-08-17 | 1989-08-29 | Hammett Rawlings H | Air cooling and directing apparatus |
US4879880A (en) * | 1989-01-17 | 1989-11-14 | Frank Harrison | Air temperature regulator |
EP0534018A1 (en) * | 1991-09-24 | 1993-03-31 | Ragaiy Georg Habeeb | Air-conditioning device |
CN2224984Y (en) * | 1995-05-25 | 1996-04-17 | 向乐元 | Air cooling device of electric fan |
US5860293A (en) * | 1997-06-16 | 1999-01-19 | Piro; Mathew P. | Air cooling apparatus including fan and cooling pack |
CA2254718A1 (en) * | 1998-12-01 | 2000-06-01 | Kelly Duchesne | Method of cooling air circulated by a fan and a cooling fan |
GB2428783A (en) * | 2005-08-05 | 2007-02-07 | Stanley George Austin | Fan having an auxiliary cooling device |
US20100126199A1 (en) * | 2008-11-21 | 2010-05-27 | Toan Trieu | Cooling Device |
Also Published As
Publication number | Publication date |
---|---|
GB201215210D0 (en) | 2012-10-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |