Passive cooling of your emergency tank shower requires no electricity to work; if you have a remote location or area that does not have suitable power then our Zero Power Cooling System is ideal. A table comparing our Flameproof Chiller, Non-Flameproof Chiller and the Zero Power Cooling System can be viewed on our website.
During the cooler night-time ambient temperatures, the convection process of the passive cooling system draws heat out of the stored water in the tank and reduces the water temperature to safe working limits. During the daytime, the external exchanger is heated by solar radiation and the coolant no longer circulates. This causes the coolant in the system to stratify, hot water stays to the top and cooler water remains lower down preventing the water in the tank heating up.
The cooling system has been tested in the UAE during the summer months where temperatures reached up to 55°C during the day and 35°C at night. There are also units currently in use in Western Australia, Saudi Arabia and Oman.
Testing has proven that the unit will maintain a water temperature of 2°C higher than the average night-time temperature. For example, if your average night-time temperature is 32°C in the summer the water in the tank shower will be maintained at or below 34°C. (ANSI Z358.1-2014 stipulates water should be maintained between 16-38°C)
The system is designed for use outdoors and in both hazardous and non-hazardous areas.
Any of our 1500 litre and 1200 litre emergency tank showers can be retrofitted to accept the cooling system. (EXP-J-14K/1500K; EXP-J-14K/1500KS; EXP-J-14K/1200K; EXP-J-14K/1200KS)
A retrofit kit and instructions are provided allowing your engineers to fit the Zero Power Cooling System to our emergency tank showers on site. Hughes can offer further support where needed - please contact our sales team for more information.
No maintenance is necessary, it is completely sealed and requires no spare parts.
If your location has temperatures consistently above the 38°C average at night, please contact our sales team for the best solution for your requirements.
Where there is direct sunlight and solar radiation in the daytime, the cooling system is designed to benefit from this. There is a positive effect in the daytime in creating hot water at the top of the cooling system (on the external exchanger) as the hot water stratifies leaving the cooler water in the lower (internal) cooling exchanger.The cooling cycle is not affected since it takes place during the evening/night-time when solar radiation is limited or zero. During the night phase, the temperature differential helps create the flow inside the cooling system to start the cooling process. An example of this can be seen on our website in the ‘How it works’ animation.
Yes, in this instance, the internal stainless steel exchanger can be coated with a chlorinated rubber coating that is suitable for use with safety showers with no risk of contamination of the water in the tank.
Please see the example below. The impact has been calculated based on 150 litres of water (10% of the volume) which equates to 2 minutes of shower use - this is more than what would be used for normal weekly testing.
Using an extreme example where the water temperature is 36°C; in this condition, if 150 litres of the 1500 litre total is replaced with the same quantity of water at 50°C the result will be 36°C + 50 x 0.1 = 36.5°C (remaining within the tepid water requirements). Please also note that this example is during the hottest months, the remainder of the year would allow for lower water temperatures in our tank showers. As such, there are no issues when the testing is performed once a week or if the shower is tested for a longer duration.
The cooling system is constructed to specifications where a design life of 20-25 years is required. A 2 year warranty is offered on the system as standard.
Problem: No mains water
Solution: Hughes Tanks Shower/Eyewash
Problem: No mains water, high daytime temperatures and no electricity
Solution: Hughes Tanks Shower/Eyewash with Zero Power Cooling Unit
Problem: No mains water, no electricity, high daytime temperatures, wind region D (316kph)
Solution: Cyclone Rated Hughes Tanks Shower/Eyewash with Zero Power Cooling Unit