Gas condensing boiler – high efficacy heating system provide –uae – Viessmann

GAS CONDENSING BOILER:

Gas Condensing boilers, while often installed for heating hot water systems, often fail to deliver their natural advantage of efficiency due to shortcomings in system design, implementation, and operation. Reduced or "more efficient" boilers are built to allow for lower water performance than traditional boilers. This allows coarse boilers to extract more useful (hidden) energy from a fuel source (usually natural gas or propane) than conventional non-turning boilers. In order for conventional boilers to realize their potential to increase efficiency, they must be used and operated in a way that allows their combustible gases to be compacted. Designers and operators who are interested in maximizing the efficiency of their conventional boilers need to have an understanding of how to design and implement the appropriate system layout and control parameters for their boilers.

CONDENSING BOILER BASICS

Gas condensing boiler One of the products of burning gasoline is water vapor. In non-invasive systems, all of this water vapor is stored in the flue fluid and ends up in the building. This is necessary because when the exhaust vapor thickens the result it becomes a slightly acidic liquid that will quickly consume substances such as cast iron used to make non-rotating boils. That water vapor, however, represents an unused energy source that can be used to heat your building. Coming back to high school physics, we remember that it takes 1 Btu for power to raise 1 lb of water at 1 ° F.

We may also remember that when the water is at 212 ° F (sea level), we can boil or steam it. This phase change (from liquid to electric) requires 970 Btus per pound of water. He said that one way to make water vapor would require 970 times more energy than to heat the same pound of water by 1 ° F. Naturally, the opposite is true. Lowering the temperature of 1 lb of water by 1 ° F removes 1 Btu of energy, but thickens 1 lb. of water vapor releases 970 Btus of power.

By allowing the return temperature of the water to enter the boiler to below 130 ° F, we allow the vapor to begin to evaporate from the flue gas. This is not a whole agreement or anything, however. The vapor in the flue gas begins to thicken only at about 130 ° F returning water temperature. You get a very small increase in performance beyond the non-minimum performance at this temperature. A little above the water temperature of 70 ° F is where you hit the effective numbers of 98% to 99% that you may see advertised. This is important to know as the return temperature of 70 ° F does not apply. This increase in boiler efficiency is almost accompanied by a corresponding decrease in the return water temperature. Knowing this is the key to getting the most out of your density boiler.

We cannot avoid creating water vapor when a fuel burn occurs. However, we can take advantage of that subtle heat by combining as much moisture as possible and absorbing that 970 Btu back into our central heating system rather than expelling that energy outside the building. We have already paid for Btus, so why not use them?

DESIGNING FOR OPTIMAL CONDENSING OPERATION:

We have recently shown how to take the schedule of resetting the boilerplate so that compaction occurs at 18 degrees OAT and above instead of just over 40 degrees. Doing so increased the blurring hours from about 3,400 (56% of heat hours) to more than 5,1007 (86% of heat hours). All of that effective profit comes from investment as the investment tube and the boiler were already selected for the project - making full use of the boiler boiler capacity.

To maximize the benefit of boiler condensing, the design should incorporate finned tube capacity so that the boiler can deliver low-temperature water to design conditions; as this method is used in new construction, a better construction envelope can reduce the heat load and reduce the need for additional radiation.

The reset schedule in Table 5 takes advantage of the 86% OAT downtime operation of 65 degrees without interfering with the indoor air temperature requirement of 70 degrees, but to maximize boiler efficiency using no more than 140 degrees Celsius. , which allows the boiler to be congested for all operating hours.