EP0260624A1 - Fresh air supply system for holds in a ship - Google Patents
Fresh air supply system for holds in a ship Download PDFInfo
- Publication number
- EP0260624A1 EP0260624A1 EP19870113358 EP87113358A EP0260624A1 EP 0260624 A1 EP0260624 A1 EP 0260624A1 EP 19870113358 EP19870113358 EP 19870113358 EP 87113358 A EP87113358 A EP 87113358A EP 0260624 A1 EP0260624 A1 EP 0260624A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fresh air
- hold
- supply system
- carbon dioxide
- air supply
- 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
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
- B63J2/02—Ventilation; Air-conditioning
- B63J2/08—Ventilation; Air-conditioning of holds
Abstract
Description
- The invention relates to a fresh air supply system for holds in a ship, particularly for holds accommodating cargo refrigerating plants, according to the precharacterising part of
Claim 1. - During the last thirty years most fresh air supply systems for cargo refrigerating plants in ships have been equipped with a high pressure system which was developed in the fifties when oil costs were less pronounced - or perhaps not given a though of at all. Today, the operating costs for a ship are considerable, which, among other things, calls for keeping the energy consumption as low as possible.
- The reason for the need to ventilate the refrigerating plant is that fruit, berries and vegetables which are to be transported consume oxygen present in the air during the ripening process while at the same time giving off heat, CO₂ and water. Bananas also produce ethylene. The higher the temperature during the transportation of a cargo, the faster will be the ripening process. it is therefore desired always to transport the cargo at as low a temperature as possible without subjecting the cargo to freeze damage and without stopping the ripening process. If the ripening is stopped, it can never be revived. To achieve a maximum storage time and maximum quality of the products, it has been found that certain values of the CO₂ concentration in the air in the storage facilities of the refrigerating plant are suitable.
- As examples the following can be mentioned:
Bananas 0.3 - 0.6% (per cent by weight)
Pears, apples 2 - 3% (per cent by weight)
Citrus fruits 0.1% (per cent by weight) -
- From these tables it is clear that the fresh air requirement varies most considerably depending on the kind of fruit that is transported.
- The fresh air supply systems which are presently available must, of course, be able to fulfill the highest demands that may be placed on them although these extreme conditions very seldom occur in reality. Furthermore, it should be noted that each unnecessary cubic meter of fresh air supplied to the cargo space causes extra costs for oil for generator operation to produce the current necessary for operating the fans and, above all, for defrosting of the air coolers in the refrigerating spaces.
- The instruments used at present for measuring the CO₂ concentration in the hold of a ship are self-calibrating precision instruments which enable a regulation of the CO₂ concentration around a mean value. Previously existing control devices have suffered from such great inherent uncertainties that many fresh air plants, in the case of fruit transportation, have been allowed to operate at full capacity during the whole voyage, irrespective of whether this was necessary or not, with resultant unnecessarily heavy operating costs.
- The invention aims at the development of a fresh air supply system of the above-mentioned kind in which the carbon dioxide content in the hold is maintained on a favorable level.
- To achieve this aim the invention suggests a fresh air supply system according to the introductory part of
Claim 1, which is characterized by the features of the characterizing part ofClaim 1. - Further developments of the invention are characterized by the features of the additional claims.
- To bring about a particularly accurate control, automatically controllable, fully sealing valves are arranged in both the supply pipe and the outlet pipe.
- Furthermore, since the fans arranged in holds do not always have sufficient capacity to effect the necessary change of air, additional fans can be arranged in both the supply conduit and the outlet conduit. The revolution rate of these fans is controlled by the member sensing the carbon dioxide content via, for example, a computer, whereby too high a carbon dioxide content leads to increased rotational speed of these fans.
- The invention will now be described in greater detail with reference to the accompanying drawing showing - by way of example - in
- Figure 1 a schematic cross-section of the cargo spaces of a ship,
- figure 2 schematically a vertical cross-section through the cargo space shown in Figure 1.
- Figure 1, shows the
sides 1 of the ship and theinsulated decks 2 in the ship. Theinsulated decks 2 divide the shown part of the ship into two separate refrigerating spaces. These, in turn, are divided byperforated decks - As will be clear from Figure 2, circulation fans 10 (producing about 350-500 Pa) and
air coolers 11 can be arranged at abulkhead 9 defining the holds. - The outlet conduit 12 for the
holds outlet conduit 13 for theholds fans 10 and theair cooler 11. These outlet conduits 12,13 run inside thesupply conduits fans valves supply conduits sim ilar fans controllable valves - For controlling the controllable valves and fans, a
member 24 is provided for monitoring the carbon dioxide content in the holds. Thismember 24, in turn, delivers control signals by means of acomputer 25 to the above-mentioned valves and fans. Themember 24 also communicates with acontainer 26 containing carbon dioxide of a known content for self-calibration of thesensing member 24. - The
fans 10 operate both during intake and exhaust of air since - as will be clear from the figures - the outlet conduits 12,13 have been connected onto the air-cooler units between thefans 10 and theair cooler 11. Thefans 10 are suitably allowed to run at full speed and control the air flow through the holds by means of thevalves fans 10 should not have sufficient capacity to keep the carbon dioxide content at the desired value, even with the valves fully open, thecomputer 25 is allowed to deliver a starting signal to thefans
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8603893A SE455857B (en) | 1986-09-16 | 1986-09-16 | FRESH CLEANING SYSTEM FOR CARGO COOLING INSTALLATIONS |
SE8603893 | 1986-09-16 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0260624A1 true EP0260624A1 (en) | 1988-03-23 |
EP0260624B1 EP0260624B1 (en) | 1992-11-19 |
EP0260624B2 EP0260624B2 (en) | 1999-03-17 |
Family
ID=20365607
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870113358 Expired - Lifetime EP0260624B2 (en) | 1986-09-16 | 1987-09-12 | Fresh air supply system for holds in a ship |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0260624B2 (en) |
DE (1) | DE3782703T3 (en) |
ES (1) | ES2037044T5 (en) |
SE (1) | SE455857B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29621845U1 (en) * | 1996-12-03 | 1997-06-12 | Sick Wolfgang | Air supply or exhaust device |
WO2012034898A1 (en) * | 2010-09-16 | 2012-03-22 | Wobben, Aloys | Ship comprising a ventilation device |
JP2014201192A (en) * | 2013-04-04 | 2014-10-27 | 株式会社コトラシステム | Dew condensation prevention device for cargo in hold |
CN113291452A (en) * | 2021-06-22 | 2021-08-24 | 广船国际有限公司 | Methanol dual-fuel ship residential area air conditioning system |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE501150C2 (en) * | 1993-04-23 | 1994-11-28 | Stal Refrigeration Abb | Method and apparatus for air distribution in cargo spaces |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3360380A (en) * | 1964-04-20 | 1967-12-26 | Whirlpool Co | Method of storing banas |
EP0205979A1 (en) * | 1985-06-11 | 1986-12-30 | Mitsubishi Denki Kabushiki Kaisha | Tunnel ventilating system |
EP0136042B1 (en) * | 1983-09-01 | 1992-01-08 | Transfresh Corporation | Improvements in and/or relating to the carriage of comestibles and in particular to containers and related means and methods suitable for such purposes |
-
1986
- 1986-09-16 SE SE8603893A patent/SE455857B/en not_active IP Right Cessation
-
1987
- 1987-09-12 EP EP19870113358 patent/EP0260624B2/en not_active Expired - Lifetime
- 1987-09-12 DE DE3782703T patent/DE3782703T3/en not_active Expired - Fee Related
- 1987-09-12 ES ES87113358T patent/ES2037044T5/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3360380A (en) * | 1964-04-20 | 1967-12-26 | Whirlpool Co | Method of storing banas |
EP0136042B1 (en) * | 1983-09-01 | 1992-01-08 | Transfresh Corporation | Improvements in and/or relating to the carriage of comestibles and in particular to containers and related means and methods suitable for such purposes |
EP0205979A1 (en) * | 1985-06-11 | 1986-12-30 | Mitsubishi Denki Kabushiki Kaisha | Tunnel ventilating system |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29621845U1 (en) * | 1996-12-03 | 1997-06-12 | Sick Wolfgang | Air supply or exhaust device |
DE19755462C2 (en) * | 1996-12-03 | 2000-07-13 | Wolfgang Sick | Air supply and / or exhaust device |
WO2012034898A1 (en) * | 2010-09-16 | 2012-03-22 | Wobben, Aloys | Ship comprising a ventilation device |
US9016223B2 (en) | 2010-09-16 | 2015-04-28 | Wobben Properties Gmbh | Ship comprising a ventilation device |
JP2014201192A (en) * | 2013-04-04 | 2014-10-27 | 株式会社コトラシステム | Dew condensation prevention device for cargo in hold |
CN113291452A (en) * | 2021-06-22 | 2021-08-24 | 广船国际有限公司 | Methanol dual-fuel ship residential area air conditioning system |
Also Published As
Publication number | Publication date |
---|---|
SE8603893L (en) | 1988-03-17 |
ES2037044T5 (en) | 1999-09-16 |
DE3782703D1 (en) | 1992-12-24 |
DE3782703T3 (en) | 1999-11-11 |
ES2037044T3 (en) | 1993-06-16 |
SE8603893D0 (en) | 1986-09-16 |
EP0260624B2 (en) | 1999-03-17 |
EP0260624B1 (en) | 1992-11-19 |
DE3782703T2 (en) | 1993-06-09 |
SE455857B (en) | 1988-08-15 |
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