The base of hydronic floor heating is formed by high tech pipe NOXY with polybutylene core with perfect flexibility. The pipe consists of100% aluminium oxygen barrier. By using this pipe, the system is totally protected from air lock.
- Original polybutylene consists of PB 4135
- Uniform core
- Polyester reinforcement
- 100% oxygen barrier
POLYETHYLENE PE-RT PIPE
Another pipe to use for underfloor heating is the polyethylene pipe.
- PE-RT core
- EVOH oxygen barrier
The basic assumption in the calculation and design of hot water floor heating is a correct understanding of the purpose, architectural expression, building and structural design and method of operation of the given facility.
The approach is completely different if we want to use this heating method, e.g. in an industrial building, church or family house.
The wear layer of floor covering in residential zones, in terms of hygiene regulations, should not exceed 28 °C. The short-occupied zones (e.g. bathroom, pool area, showers, etc.) are excluded.
When calculating the energy balance of individual buildings it is essential to take into account the requirements for calculating heat losses in special cases, i.e. when building structures are adjacent to the ground, or the building height, respectively the height of heated space is more than required. And last but not least, when it comes to buildings with massive building structures, or with the sources of moisture and excessive glazing surfaces. Similarly, in determining the energy consumption it is important to know the method of operation because intermittent heating occurs in most cases.
The right choice of the floor structure is of great importance. This structure must be, especially in cases of extreme stress, reinforced by structural steel based on a static calculation. Consequently, an adequate method of installation is assumed, both in terms of shaping the heating surfaces, but especially with regard to ensuring the separate expansion units with an application of the most appropriate assembly technology, including the necessary heating and operational tests.
A separate issue is the question of regulation. Therefore, there must be proper interaction between the construction concept of the building and the heating system solution, from the source of heat, through the design of floor heating itself, to a final selection of an adequate measurement, control and automation equipment. Otherwise, the operation of such a building may not show the declared energy and comfort parameters despite the advantages of the hot water floor heating system.
- In terms of ideal temperature distribution we recommended a maximum length of a heating circuit of 100 lm, extremely up to 120 lm.
- In determining the input data in other rooms it is necessary to take into account the same medium heating water temperature so that it is not necessary to control each circuit of the manifold separately to a different value.
- It is advised that, in terms of better regulation and better temperature distribution, each larger room should have its own circuit. If the space has a larger surface area it is necessary to design a proportionately higher number of heating circuits. Small rooms (e.g. bathrooms, toilets ...) may be interconnected into a single circuit.
- The lengths of heating circuits should be approximately the same. One heating circuit can cover multiple smaller rooms. A different floor temperature is achieved by changing the heating pipes spacing..
- The size of the heating surface of one circuit must not exceed 25 m. One dimension of the surface is not more than 6 m. Larger heating surfaces must be divided by an expansion joint into expansion units.
- The pipe passing through an expansion joint must be in a protective pipe (polyethylene ribbed hose) with a minimum length of 50 cm where the expansion joint is in the middle.
- The spacing of the heating coil is 100 to 300 mm. The outer pipe is placed about 150 mm to 250 mm from the wall.
- It is preferable to reduce the pipes spacing along the external walls - to create a so-called peripheral zone and thus increase the surface temperature of the floor. This will increase the heat output and reduce the adverse cold radiation of the wall.
- The thickness and quality of the thermal insulation layer under the heating surface affects the size of the heat flow downwards. If an unheated space is located under the heated space, the heat loss must not exceed 10% of the heat output..
- Heating pipes are installed with the supply starting at the coolest wall.
- Place the manifold so that the distance of the heating pipes to the heating surfaces is approximately equal.