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FAQs
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1. How does the system work?
In its simplest form, The DRYAIR system utilizes a heater to raise the temperature of a water/glycol heat transfer fluid. The heat transfer fluid is pumped to independent portable heat exchangers, comprising a hydronic coil and fan. The fan draws air over the hydronic coil, the air, which is heated by this process, is re-introduced to the work site. 1 Base Heater Unit can supply multiple portable heat exchangers, which can be located upto 500 feet away from the Heater Unit.
2. Is the system pressurised?
No. The DRYAIR system does not fall under pressure vessel regulations. It is an "open system" with an atmospherically vented expansion tank and a maximum operating pressure of 2.07 bars.
3. How difficult is the system to operate?
Very simple! There is a switch for the circulation pump, a switch to fire the Base Heater Unit and a temperature setting to control the temperature of the heat transfer fluid. Once the system is running and initial start-up is complete, it is completely automatic. The water heater will automatically respond if heat requirements change!
4. How is the air temperature in individual areas controlled?
Thermostats are used on each individual heat exchanger. The thermostats act as on/off switches for the heat exchangers. By shutting off the fan, heat transfer from fluid to air is interrupted.
5. Does the DRYAIR system add moisture to the work site?
No. A DRYAIR system provides "desert air" conditions using portable heat exchangers, which provide fluid-to-air heat transfer of clean, heated, low relative humidity air.
Note: An increase in air temperature of 10°C reduces relative humidity by 50%. This allows the air to capture more moisture.
In this way DRYAIR systems actually achieve total structure dry-out. The system’s exceptional dry-out capabilities make it a perfect fit for removing excess moisture caused by flooding or high humidity environments and provides the ideal drying conditions for interior finish work. On construction projects the DRYAIR system therefore:
- Minimizes expansion and contraction of plasterboard.
- Reduces amount of downtime between finished drywall and paint application.
- Eliminates shading of paint caused by residue from open flame heaters.
- Allows better adhesion of caulking materials.
- Provides a drier surface for application of water-based carpet and tile adhesives, epoxy and urethane coatings and epoxy joint fillers.
- Reduces the chance of shrinkage at mitered joints in finish trim materials.
On the other hand, direct flame burners add to the problem of relative humidity as they generate moisture.
6. Is there a fire hazard?
No, because fuel combustion occurs only in the water heater, which is located away from the workplace. Also, the heat transfer fluid temperature levels never exceed 88°C... well within safe levels.
7. What fuel source can be utilized
The DRYAIR system is independent of local power sources, which may be cut off during a flood disaster. The system is powered using non-commercial diesel fuel and generator power within 'site-safe' legal requirements.
8. How does the DRYAIR system affect concrete?
Two factors come into play when curing concrete. The hot, low relative humidity air produced by the DRYAIR system will remove moisture from the concrete. This will help accelerate the concrete-curing process.
NB. A DRYAIR system does not reduce on-site oxygen levels, which could cause oxidization of the concrete and which can be seen in the form of "dusting". Once oxidization in the concrete has occurred, it cannot be corrected. DRYAIR systems prevent oxidization.
9. Will the DRYAIR system reduce my heating costs?
The DRYAIR system is more economical to operate than conventional portable heating systems. By eliminating the need for supplemental ventilation, a building can typically be heated with half the KW capacity - resulting in substantial energy savings.
10. How will an indirect heating system affect my insurance costs?
With the threat of fire and explosions eliminated, insurance rates may also be reduced. Contact your insurance broker to confirm.
11. What are the supervision requirements?
The fuel-burning appliance is away from the work site and in its own enclosure... virtually no supervision is required. Temperature controls are automatic... a real plus for over-night and weekend work breaks.
12. Does the system require a lot of maintenance?
Very little; As the Base Heating Unit is operating with good, clean air away from the work site, its operation is virtually maintenance free. The heat exchangers may require periodic cleaning if operating in dusty conditions.
13. How will the DRYAIR system improve conditions on the work site?
- As heat is provided with a liquid-to-air transfer, no noxious fumes are introduced.
- As you are not required to ventilate the work site, temperatures remain more constant.
- Portable heat exchangers are much quieter than burners.
- By not introducing added moisture to the work site, moisture or ice build-up does not occur. Conditions are more reminiscent of a summer job site.
- Because of a healthier work environment, increased worker productivity and decreases in employee absenteeism are highly probable.
14. What type of structures can be heated with the DRYAIR system?
DRYAIR's modular components make it ideally suited to all heating applications, whether it be multi-storied, multiple space or large, open structures.
15. How would I situate the system on the work site?
The modular components of the system allow you total versatility in positioning the Base Heating Unit. Locating the Base Heating Unit away from the work area and circulating heated fluid to powered heat exchangers located in remote positions on the work site is the normal procedure.
16. Is the DRYAIR system portable?
Yes; the Base Heating Unit is very portable. It is mounted in an enclosed trailer, which makes it secure and noise-proof. The trailer allows you to easily move the system on site.
17. Do we have to drain the system of fluid once our project is complete?
No. The Base Heating Unit, the remote circulation manifolds and hoses are equipped with quick couplers and shut-off valves so that the system can be dismantled without draining.
18. Is the heat transfer fluid utilized in the DRYAIR system environmentally friendly?
Yes; DRYAIR systems utilize a Dowcal food grade propylene glycol / water combination as a heat transfer fluid. This is non-toxic.
19. Can the DRYAIR system utilize permanent or temporary in-floor heating lines?
Yes. Curing concrete & temporary heating, utilizing floor heat, can be accomplished by laying disposable plastic line in the concrete when pouring. It would also be possible to temporarily circulate through in-floor lines that would eventually be incorporated into a permanent heating system. We recommend that you consult with project engineers or project architects prior to using the DRYAIR system in the above manner.
20. Can a DRYAIR system tie into air ducting already in place?
Yes. There are a number of advantages to this approach: superior heat distribution throughout the site and no heating equipment under foot. It is the easiest method of providing and maintaining heat on a project with a large number of individual rooms.
21. Can a DRYAIR system be used for ground thaw and concrete cure applications?
Yes. All components required for ground thaw and concrete cure, including “thaw/cure hoses” and “Hose Reels” are available. These can be hooked up to the Base Heating Unit and generator on site.
22. Why does the heat exchanger air temperature feel cooler than a direct flame burner?
The DRYAIR Heat Exchanger has been designed to eliminate "Hot spots" in a building by using high air flow. Example: a direct flame burner of equivalent size or rating will output 236 L/sec of air at 205 °C while a DRYAIR PHE-60EU portable heat exchanger will output 1,085 L/sec of air at 49 °C. This is an equal amount of KW output, but the effect is different. The low air flow and high temperature of the direct flame burner will create a hot spot around itself and cause an uneven distribution of heat throughout the building. The DRYAIR fan is designed to move much more air at a lower temperature and creates a more even temperature throughout the building without the use of additional fans.
23. Why does a DRYAIR Heat exchanger increase its KW output when the air entering the heat exchanger is cold and the air exiting the coil is also colder?
The Dryair system is based on the principle of heat transfer from the water to the air, thus the greater the difference between the air passing over the coil and the water temperature passing through the coil, the greater the transfer of heat.
24. Is heat loss from fluid lines a concern?
Heat loss from the fluid lines is usually insignificant (approx. 3% only) over distances upto 500 feet from the Base Heating Unit. Indoors the heat loss from the fluid lines simply contributes to the heating of the building.
25. Why should you choose a DRYAIR system for your temporary heating requirements?
Today, more Project Managers are looking for temporary construction heating systems that meet the following list of criteria;
- It must be reliable.
- It must be environmentally safe and eco-friendly, with no fear of secondary damage to the building structure.
- It must be economical.
- It must be versatile.
- It should provide a zero risk of fire or explosion.
- It should not have a negative impact on the working conditions and the environment.
- It should not have a negative impact on the quality of the end product.
A DRYAIR system will meet all of these criteria!
Allows for daily application of joint compound or finish texture to drywall. |
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