GeorgeAskew
Mechanical
- May 6, 2008
- 5
Heres a bit of a different one chaps.
I am endeavoring to build a divers hotwater system. Supplying to 2, 4 or 6 divers. Seawater temp 14-17 degrees C. Depth 2-3 metres. Duration - up to several hours [Say 6]. Activity minimal. Wearing baggy suits tightened at ankles, wrists and neck with velcro. Head and feet insulated. Heat loss through conduction minimum /minute = 10% Max = 50%. Hose length max 15m - heat loss minimal say 3%. So how much water and at what temperature must the diver get it to be comfortable [say 28* C]?
Space for equipment is minimal as is electricity supply [If I install solar panels [max area available to support panels = 3x4m] but as sun can range from blazing to nil I see it as a bonus when there is sun.
I propose a combination of large size Propane gas water heaters as found in some bathrooms and electricity. Is there any difference which does primary and secondary heat. Just a wild guess I`d say the water needs to be heated to 30 *C - go into an insulated holding tank [What size?] then be pumped to the divers. [The inlet water will run thru about 30m of hose on the deck to be pre-warmed by the sun when its there. I feel the primary heat to the cold water should be gas and electric elements can keep the tank topped up.
I need the size of hose from tank to a manifold just above the surface [length 12m] with 6 take-offs [I`d guess it cant be more than 30mm OD. It can be rubber or galv iron or plastic [From manifold to diver - Probably 16mm ID Garden hose 4m long].
What size and type 220v pump?
How much electricity needs generating to drive pump and heat water?
How much Propane will be burnt?
How long will the gas heaters last with seawater in them or can one get non corrosive?
2nd part
Same senario. Air: Same kind of primary hose to a manifold and same length hoses to divers but smaller dia. How much air must each diver be supplied [minimum]with a free flow system or using 2nd stage scuba regulators?
Regulators usually work at 120 -200psi but a weakend spring and 40psi will be OK at this shallow depth.
The regulators should use less air but as bubbles may be a problem a free flow back to surface taking air from a T piece is ideal but will use more air.
What size compressor [CFM] storage tank unnecessary and what size 220v motor to drive it?
So there it is in a seashell - What are my power requirements etc
I am endeavoring to build a divers hotwater system. Supplying to 2, 4 or 6 divers. Seawater temp 14-17 degrees C. Depth 2-3 metres. Duration - up to several hours [Say 6]. Activity minimal. Wearing baggy suits tightened at ankles, wrists and neck with velcro. Head and feet insulated. Heat loss through conduction minimum /minute = 10% Max = 50%. Hose length max 15m - heat loss minimal say 3%. So how much water and at what temperature must the diver get it to be comfortable [say 28* C]?
Space for equipment is minimal as is electricity supply [If I install solar panels [max area available to support panels = 3x4m] but as sun can range from blazing to nil I see it as a bonus when there is sun.
I propose a combination of large size Propane gas water heaters as found in some bathrooms and electricity. Is there any difference which does primary and secondary heat. Just a wild guess I`d say the water needs to be heated to 30 *C - go into an insulated holding tank [What size?] then be pumped to the divers. [The inlet water will run thru about 30m of hose on the deck to be pre-warmed by the sun when its there. I feel the primary heat to the cold water should be gas and electric elements can keep the tank topped up.
I need the size of hose from tank to a manifold just above the surface [length 12m] with 6 take-offs [I`d guess it cant be more than 30mm OD. It can be rubber or galv iron or plastic [From manifold to diver - Probably 16mm ID Garden hose 4m long].
What size and type 220v pump?
How much electricity needs generating to drive pump and heat water?
How much Propane will be burnt?
How long will the gas heaters last with seawater in them or can one get non corrosive?
2nd part
Same senario. Air: Same kind of primary hose to a manifold and same length hoses to divers but smaller dia. How much air must each diver be supplied [minimum]with a free flow system or using 2nd stage scuba regulators?
Regulators usually work at 120 -200psi but a weakend spring and 40psi will be OK at this shallow depth.
The regulators should use less air but as bubbles may be a problem a free flow back to surface taking air from a T piece is ideal but will use more air.
What size compressor [CFM] storage tank unnecessary and what size 220v motor to drive it?
So there it is in a seashell - What are my power requirements etc
