When should I use a low loss header?
When should I use a low loss header?
Low loss headers are typically used as ‘hydraulic separation’ between any two or more circulating pumps within a heating system. This hydraulic separation allows each pump to work independently at its own flow rates. Without pulling or pushing on the other.
What is a low pressure header?
Header. The Swagelok low pressure header (LPH) is a manifold that provides a means of distributing or collecting a system fluid using a lightweight, 316 stainless steel body. An LPH connects several users to the system fluid.
What is a header on a boiler?
A header transfers a heat transfer medium (water, steam, oil, etc.), typically via pipe(s), between (one or more) boilers and (one or more) points where the heat is required. A header can connect a single boiler to a single point where heat is needed.
What is a shunt pump used for?
What is a shunt pump? The primary task of the boiler shunt is to ensure that the difference in temperature between the top and the bottom of the boiler is not too high. The boiler shunt pump circulates the water from the flow pipe into the return pipe or directly into the boiler.
Why would you fit a low loss header?
A low loss header is installed to ensure that the flow rate of water is high enough to be able to heat a large building or even multiple buildings, such as an office complex. If the pump is too big, it might be pushing hot water around the radiators too quickly, therefore wasting energy.
What is a reverse return heating system?
A reverse return system is a type of closed loop system where the return header is connected to the most hydraulically remote load, as shown in Image 1. Image 4 shows the calculations for an identical system with the exception of an additional length of piping on the return header to create a reverse return system.
What is a low loss header for?
What is a dropped header?
A “dropped header” is a header that is installed below the roof or floor framing with a short wall (knee wall) between the header and the top plate. This detail can be problematic if the beam is not designed for the unbraced condition.
How often should a Destratification shunt pump be run and under what conditions?
In these cases, a destratification pump should be fitted between the top and bottom of the calorifier. This pump should be run on a timer for at least one hour each day, at a time of low water usage.
What does a low loss header look like?
A low loss header usually has a drain at the bottom of it. Hot water passes through the header at a lower pressure than it would pass through the rest of the system. This reduction in pressure and speed allows time for any dirt and debris in the system to sink to the bottom of the header.
What is hydraulic separation?
In essence, that is what hydraulic separation is: The ability of two or more circulators within the same piping system to simultaneously operate without interfering with each other. Properly designed and installed primary/secondary pipingcan achieve hydraulic separation between all circulators.
What is reverse piping?
A reverse return system means that supplies and returns are the same length throughout the water system, making for a more even water flow to all terminals. However, unless the system is designed to be self-balancing, balancing valves will still be necessary to ensure consistent water flow.
How to calculate the size of low loss header?
As I understand it sizing a LLH will require some site specific information of the system & how you intend to run it.
How is a low loss boiler header sized?
The low loss header should be sized based on the maximum flow rate of the system. This sizing is carried out looking at a number of factors; output of the boiler (s), system load, design, and potential temperature differential.
Can a low loss header be installed vertically?
If installed vertically, low loss headers can help collect sludge from the system. Due to the low flow velocity through the low loss header, the debris from the system has time to fall to the bottom of the header and traps for safe removal via a drain valve. However, we would still advise having…
What does a low loss header do in a hydronic system?
2.3 HYDRONIC ISOLATION: LOW LOSS HEADER A low loss header allows flow separation within a hydronic system. This allows two flow circuits to operate with their own flow and pressure drop environments whilst effectively transferring heat to its adjoined water circuit.
How big does a low loss header need to be?
You should size the low loss header based on the maximum system flow rate of your system. A suitably qualified heating engineer will be able to advise on which size you may need based on a number of factors. Low loss headers are sized in cubic metres per hour. A low loss header cannot be oversized, but can be undersized.
The low loss header should be sized based on the maximum flow rate of the system. This sizing is carried out looking at a number of factors; output of the boiler (s), system load, design, and potential temperature differential.
How are low loss headers used in hydraulic separators?
A. Based on the flow rate through the low loss header the body is sized to achieve a very low flow velocity – typically less than 0.3m/s. This low velocity ensures a low pressure drop between flow and return. Q. Is a Hydraulic Separator the same as a Low Loss Header? A.
Where is the return point of a low loss header?
All secondary circuit returns and the return to the boilers should be at the bottom, or other end of the header. This helps ensure correct entry temperature into the secondary circuits by avoiding temperature dilution of the flow temperature along the low loss header.