Heating and cooling ceiling systems Zehnder ZIP Planning document. Heating Cooling Fresh Air Clean Air

Transcription

1 Heating and cooling ceiling systems Zehnder ZIP Planning document Heating Cooling Fresh Air Clean Air

2 Sportforum, Berlin (Germany)

3 Modelled on the sun. The heating effect of the sun's rays a natural principle adopted by Zehnder ZIP radiant ceiling panels for indoor spaces convenient, healthy and energy-efficient. They do not use any electrical energy and are totally maintenance-free. Since they do not disperse any dust, they can help prevent allergic reactions and colds. What's more, because the perceived temperature is around 3 K higher than the actual temperature, you benefit from a really cosy feeling with minimum energy consumption. Zehnder ZIP radiant ceiling panels are ideally suited to rooms with high ceilings, such as production halls and warehouses, workshops, sports halls, garages, showrooms, shipyards, maintenance halls and wet rooms. As one of Europe's leading suppliers of radiant ceiling panels, Zehnder has decades of valuable experience to draw from. Product benefits 4 Structure and designs 6 Standard lengths and combination options 8 Standard installation sets 9 Suspension technology 10 Special solutions 12 Technical data 15 Dimensions 20 Spacing of suspension points 22 Headers and deflectors 23 Dimensioning example 24 Pressure loss calculation 26 Hydraulics 28 Zehnder always around you 30 3

4 Product benefits Like all Zehnder products and systems, Zehnder ZIP radiant ceiling panels offer many benefits which contribute to creating a comfortable, healthy and energy-efficient indoor climate. 1 Economic efficiency Possible energy savings of over 40% Air temperature may be up to 3 K lower (heating) or 3 K higher (cooling) than the perceived temperature Free choice of energy No additional power costs for driving energy No maintenance or servicing costs source 2 Comfortable climate Radiant heat principle Heating and cooling effect immediately noticeable Even distribution of temperature across the full height of the building Even, comfortable heat distribution throughout the room No dust dispersal The system runs absolutely silently 3 Technology High heating and cooling capacity (according to EN or based on DIN ) Lightweight construction makes installation easy Extremely quick response to temperature changes Heat insulation installed ex works Protected against corrosion according to DIN Special version also suitable for use in wet rooms 4 Flexibility Modular design, can be combined freely in terms of both length and width, length 2, 3, 4, 5 and 6 m, width 320 mm No welding required Unrestricted use of floor and wall space You can find more information on planning documents and assembly instructions at: Flexible fixing system simplifies installation 4

5 Production hall at Ohnhäuser, Wallerstein (Germany) Product benefits 5

6 Structure and designs Zehnder stands for quality, functionality and design. The company is certified to ISO 9001 and ISO and manufactures its products in accordance with the strictest quality guidelines. Zehnder ZIP radiant ceiling panels are produced and tested according to EN and are therefore CE-compliant. Structure of the element A galvanised steel panel with Zehnder special clip profiling forms the basis of the radiant module. Four galvanised precision steel pipes and the top heat insulation are then embedded into it. The panel is statically reinforced using chamfers, special duplications and edgings. Reinforcement bar Insulation Installation set The Zehnder ZIP radiant ceiling panels are supplied with a smooth surface. This is galvanised and also coated with a high-quality polyester paint (similar to RAL 9016). Radiant panel Precision steel pipe 15 mm x 1 mm 6

7 Connector technology Press fitting 6 bar/120 C (level 2) If you are using two or more individual elements, they will need to be connected to one another. The individual elements are assembled into the desired configuration by means of press-fit connections and the joins are then hidden under a cover. The headers are painted as standard, so all you see is great design. Designs Installation set Zehnder ZIP radiant ceiling panels have a width of 320 mm. Individual element Panel modules can be produced in lengths of between 2 m and 6 m. Multiple individual elements can be connected together using press fittings to form one radiant ceiling panel strip. Individual element Header with connections Venting provided on site Coupling plate Venting provided on site Header with connections Individual element Cover Individual element Structure and designs 7

8 Standard lengths Length 6 m The Zehnder ZIP radiant ceiling panels are available in standard lengths of 2, 3, 4, 5 and 6 m. Longer strips can be created by connecting multiple individual elements in a row. Length 5 m Length 4 m Length 3 m Length 2 m Combination options Individual Zehnder ZIP panel The Zehnder ZIP radiant ceiling panels can be installed individually or next to each other. Up to four panels can be installed next to each other. 2 Zehnder ZIP panels next to each other 3 Zehnder ZIP panels next to each other 4 Zehnder ZIP panels next to each other 8

9 Standard installation sets There are five standard installation sets for installing the radiant ceiling panels. In addition, Zehnder offers a number of customised solutions on request. Concrete ceiling Installation set KN Steel profile Installation set KN 54 Provided on site Trapezoidal steel panel Installation set KN Provided on site Inclined steel girder Installation set KN Provided on siter Key 1 Hexagon nut M8 2 Steel dowel M8 3 Girder clamp M8 4 Securing clip 5 Flat leaf screw M8 6 Trapezoidal hanger M8 7 Chain 8 Carabiner hook 5 x 50 9 Eyelet screw M8 10 Washer 11 Hexagon screw M8 x Hexagon screw M8 x 110 Horizontal steel girder Installation set KN Standard installation sets 9

10 Suspension technology There are many different possible forms of suspension and fixing. Using multiple suspension bars when positioning several Zehnder ZIP modules next to one another reduces the number of installation sets required. 10

11 Z-profile The Zehnder ZIP modules can be individually fixed close to the ceiling using Z-profiles. Support tracks One fixing option is support tracks, on which the Zehnder ZIP modules are positioned. The distance between the tracks can be up to 3 m. These tracks offer the benefit of keeping the radiant ceiling panel close to the ceiling. Fixed swing The fixed swings are screwed into the ceiling and allow the Zehnder ZIP radiant ceiling panels to be fitted flush with the ceiling. Flexible swing The flexible swings enable a tilted fitting across the width of the radiant ceiling panels. The modules interlock with the pipe beading in the flexible swings to prevent them from slipping sideways. Suspension technology 11

12 Special solutions Zehnder ZIP radiant ceiling panels are extremely flexible: as well as the wide standard range, there are also a number of special solutions available. Therefore, whatever the room and whatever the project, we have exactly what you need. Ball deflector grid Practical in sports halls: the curved, galvanised grid ensures that stray balls do not get stuck on the radiant ceiling panels. Zehnder ZIP radiant ceiling panels are also tested by the material test institute in Stuttgart for ball impact resistance in accordance with DIN Dust protector panel Zehnder ZIP radiant ceiling panels, if required, can be sealed with a dust protector panel. A solution which is just as easy to maintain as it is hygienic, ideal for spaces prone to dust build-up. 12

13 Raised headers The headers finish above the radiant panel sheet and the customer cannot see them from below. Non-continuous radiant panel plate This version allows light to pass through unobstructed, for example, from skylights. Wet room design This design of the radiant panels is suitable for use in wet rooms (steam). Special solutions 13

14 14 Striebig logistics centre, Hatten (France)

15 Technical data Zehnder ZIP Unit of measurement Individual ZIP panel 2 ZIP panels next to each other 3 ZIP panels next to each other 4 ZIP panels next to each other Installation widths mm Number of pipes Piece Pipe material/dimension (exterior ø x pipe thickness) - / mm Precision steel pipe/15 x 1 mm Panel material Steel Spacing between the pipes mm 80 Dimensions Spacing between panels mm Min. overall length of individual panel mm 2000 Max. overall length of individual panel Number of suspension points per axis Spacing between suspension points per axis mm mm x 704 Parameters Max. operating temperature 1) C 120 Max. operating pressure 2) bar 6 Empty weight without water, with insulation Radiant panel kg/m Per collector kg Weight of insulation kg/m Weights Water capacity l/m Operating weight with water, with insulation Radiant panel kg/m Per collector kg Weight of ball deflector grid kg/m Not provided Heat output Thermal output according to EN at t = 55 K with insulation Thermal output constant (K) Thermal output exponent (n) W/m Cooling capacity Cooling capacity based on DIN at Δt = 10 K with insulation W/m Cooling capacity constant (K) Cooling capacity exponent (n) ) Higher operating temperature on request. 2) Higher operating pressure on request. Technical data 15

16 Heating and cooling performance Key t air t sur Air temperature ( C) Surrounding surface temperature ( C) = average radiant temperature = average surface temperature of all surfaces in the surrounding area ( C) t i = t p Indoor temperature ( C) =perceived temperature ( C) t hf Heating flow temperature ( C) t hr Heating return temperature ( C) t cf Cooling flow temperature ( C) t cr Cooling return temperature ( C) t exc Excess temperature (K) t low Under temperature (K) K Constant n Exponent Physical units Degree Celsius ( C) Kelvin (K) Cubic metre (m 3 ) Metre (m) Millimetre (mm) Pascal (Pa) Kilogram (kg) The following tables show the heating and cooling performance of the Zehnder ZIP radiant ceiling panels depending on the excess and under temperatures. The heating output values have been measured according to EN 14037, while the measurement results for the cooling capacity are based on DIN Note: The removal of the insulation has a positive effect on the cooling capacity (see table). However, this additional output can only be attributed to the room if it has an open ceiling. Removing the insulation Cooling load without insulation K n t low (K) Individual ZIP panel ZIP panels next to each other increases the heat output, but can lead to heat accumulation under the ceiling. We recommend the galvanised header design if the Zehnder ZIP radiant ceiling panels are to be used for cooling. Output = K Δt n The excess and under temperatures can be calculated arithmetically: t i = t p = (t sur + t air ) 2 t exc = (t hf + t hr ) - t 2 i t low = t i - (t cf + t cr ) 2 3 ZIP panels next to each other ZIP panels next to each other W/m W/m W/m W/m Cooling load with insulation Individual ZIP panel 2 ZIP panels next to each other 3 ZIP panels next to each other 4 ZIP panels next to each other K n t low (K) W/m W/m W/m W/m

17 Heat output with insulation K n Δt (K) Individual ZIP panel W/m W/collector pair 2 ZIP panels next to each other W/m W/collector pair 3 ZIP panels next to each other W/m W/collector pair 4 ZIP panels next to each other W/m W/collector pair Technical data 17

18 Inclination Depending on the design of the ceiling, radiant ceiling panels can be inclined in the lateral or longitudinal direction. q g = q x s Angle of inclination Radiant ceiling panel inclined in the lateral direction Angle of inclination Radiant ceiling panel inclined in the longitudinal direction Correction factor s Angle of inclination Increase in total thermal output q g with inclined radiant ceiling panels 18

19 Minimum mass flow To maintain the output shown in the table, a turbulent flow must be ensured within the pipes in the panels. This minimum mass flow depends on the lowest system temperature. When heating, this corresponds to the return temperature. When cooling or in a combined cooling/heating mode, this corresponds to the cold water flow temperature. If the minimum mass flow per pipe is not achieved, this can result in a drop in performance of around 15%. Minimum mass flow per pipe in kg/h Lowest system temperature in C Temperature limits The right design temperature must be selected in order to ensure the radiant system delivers a comfortable climate throughout the room. You can use the adjacent table and graph to check this design temperature, which must be lower than the two limit temperatures (average temperature of heating medium). Higher limit temperatures can be used for rooms and corridors where people do not spend a great deal of time. These values are only intended as a guide. A detailed calculation can be performed according to ISO Suspension height Proportion of the ceiling surface covered by Zehnder ZIP radiant ceiling panels m 10% 15% 20% 25% 30% 35% Average temperature of heating medium in C Step 1: Ceiling coverage. The design temperature must not exceed the defined thresholds. Average temperature of heating medium in C ZIP panels next to each other 3 ZIP panels next to each other 4 ZIP panels next to each other Suspension height in m Step 2: Width of the radiant panel. The design temperature must not exceed the defined thresholds. Technical data 19

20 Dimensions Module dimensions N J I O L M E F H H D A B K G C Attachment dimensions q i 1 j d e 3 o 2 p q o p q 5 4 a b c c b a 20

21 Item Description Dimension in mm Min. dimension in mm Max. dimension in mm A Overall width B Width of header C Overall length (without connections) Variable Grid length 1000 mm D Length of pipe Variable Grid length 1000 mm E Length of individual element Variable Grid length 1000 mm F Length of radiant panel for individual element Variable Grid length 1000 mm G Pipe overlap to header H Pipe overlap to connector piece I Distance between two pipes 80 J Distance between pipe and side lip K Length of header 32 L Overall height (without suspension) 55 M Height of header 32 N Height of side lip 42 O Height of pipe beading 13 Note Item Description Dimension in mm Min. dimension in mm Max. dimension in mm Note 1 Fixing with suspension swing using installation sets (Z-profile) a Header Z-profile 500 b Z-profile Z-profile Variable c Z-profile connection point Variable q Bottom edge of radiant panel bottom edge of concrete ceiling 55-2 Fixing on a reinforcement axis (individual ZIP modules) a Header axis 500 b Axis axis Variable Grid spacing 1000 mm c Axis connection point Variable d Outer edge of module centre of 1st suspension point 32 e Bottom edge of radiant panel upper edge of suspension point 39 3 Fixing on multiple suspension axes (2, 3 or 4 ZIP modules next to each other) a Header axis 500 b Axis axis Variable Grid spacing 1000 mm c Axis connection point Variable i Outer edge of module centre of 1st suspension point 32 j Bottom edge of radiant panel upper edge of suspension point 35 4 Fixing with suspension swing for direct side suspension (fixed swing) a Header fixed swing 500 b Fixed swing fixed swing Variable c Fixed swing connection point Variable o Outer edge of module centre of 1st suspension point 32 p Bottom edge of fixed swing bottom edge of concrete ceiling 91 q Bottom edge of radiant panel bottom edge of concrete ceiling 55 5 Fixing with suspension swing using installation sets (flexible swing) a Header flexible swing 500 b Flexible swing flexible swing Variable c Flexible swing connection point Variable o Outer edge of module centre of 1st suspension point 14 p Bottom edge of flexible swing bottom edge of suspension point 81 q Bottom edge of radiant panel bottom edge of suspension point 50 Dimensions 21

22 Spacing of suspension points per axis

23 Headers and deflectors 80 AG 1" Header 2 IG 1/2" The painted headers and deflectors are pressed together with the externally galvanised pipes (as per DIN EN 10305) of the Zehnder ZIP modules. Header 4 Header 6 IG 1/2" AG 1" IG 1/2" AG 1" Header AG 1" IG 1/2" Header AG 1" IG 1/2" Deflector 12 IG 1/2" Deflector 8 IG 1/2" Deflector 6 IG 1/2" Deflector 4 S 200 IG 1/2" Deflector 4 IG 1/2" Headers and deflectors 23

24 Dimensioning example Dimensioning basics The heating load of the room is calculated according to the applicable standard. If the air exchange rate of a room is above the usual level achieved with gap ventilation (max.1/h), particularly with extraction systems, the air fed in to the room must be pre-heated. Radiant heating systems alone cannot prevent cold air from entering the room at gates or loading areas. Strip curtains or air curtains, for example, must be used to help rectify this situation. Example of dimensioning and arrangement The following example shows how a hall is dimensioned. Goal To achieve an even indoor temperature (20 C) throughout the entire room. Specifications Free-standing hall: Length 50 m, width 20 m, height 8 m Air exchange: 0.3 1/h Outdoor temperature: 12 C Heating load Standard conducted heat lost: Standard air infiltration heat loss: Standard heat loss: W W W Dimensioning of the radiant ceiling panels Flow temperature: 70 C Return temperature: 50 C Thermal output Type Installation length in m Excess temperature in K W/m W/ collector pair Quantity Total thermal output in W Mass flow per strip in kg/h 4 ZIP strips next to each other 2 ZIP strips next to each other W 24

25 2 ZIP strips next to each other 4 ZIP strips next to each other 23 C Radiant temperature 17 C Perceived temperature Air temperature The local distribution of the indoor temperature is calculated for a height of 1 m above the floor. Even at the edges of the room, the indoor temperature deviates from the design value only slightly. Dimensioning example 25

26 Pressure loss calculation Pressure loss of the header pair incl. connections The pressure drop for Zehnder ZIP radiant ceiling panels is calculated as a total of the pressure drop for the pipe register and the pressure drop in the connections between the register and the piping. When using Zehnder volume flow controllers, the additional pressure drop for the volume flow controllers should be added to this. Determining the pressure loss: Pressure loss in Pa e.g. 2 Zehnder ZIPs next to each other; 48 m 1. Calculate total mass flow of the radiant ceiling panel in question, e.g. m = 601 kg/h (see page 24) Total hot water flow in kg/h 2. Read pressure loss for the header pair from the diagram, e.g. Δp = 600 Pa/header pair. Since the heating water flows into and out of a header twice, the value should be multiplied by two. 3. Refer to the graph for the pressure loss of the pipe. The mass flow is calculated by dividing the total mass flow by the number of pipes with parallel flow. e.g. 600 kg/h: 4 pipe rows = 150 kg/h Δp = 135 Pa/m * 48 m * 2 (for flow and return) = Pa Pressure loss per pipe Pressure loss in Pa/m The total pressure loss for the radiant ceiling panel is simply the sum of the individual pressure losses calculated, e.g. 600 Pa * Pa = Pa Mass flow per pipe in kg/h 26

27 Sportforum, Berlin (Germany) Pressure loss calculation 27

28 Hydraulics Hydraulic balancing of radiant ceiling panels In any branched heating or cooling system, the hot water flow must be correctly distributed for efficient operation. (It should also be possible for all strips of radiant ceiling panels to be filled, shut off and drained separately.) For systems where the radiant ceiling panels and, therefore, the volume flows are identical, laying pipes according to the Tichelmann system (two-pipe system with reverse return, see Fig. 1) will provide a solution with no hydraulic complications. However, the third pipe results in a considerable increase in costs where space heating systems are concerned and is not advisable in many instances if panels of different sizes are used. Systems where the individual panels have different outputs must be subjected to hydraulic balancing by means of piping calculations and adjustments. This process, however, demands a significant investment in terms of time and money. Hydraulic balancing is made much easier with the Zehnder volume flow control combination (VSRK) (Fig. 2). Fig. 1: Pipes laid according to the Tichelmann system (two-pipe system with reverse return) For more information and descriptions: Fig. 2: Simpler pipe layout with Zehnder volume flow control combination (VSRK) 28

29 The Zehnder volume flow control combination VSRK The VSRK is a complete set consisting of a volume flow controller, shut-off ball valves and filling and emptying ball valves. The controller (Fig. 3) is set to the volume flow of the strip ex works. This removes the need for any timeconsuming adjustment work on site. Other benefits of the VSRK: constant heating agent flow even when there is a high differential pressure, hydraulic balancing even for radiant panels of different sizes. All panels must have a flexible connection (armoured hose). The Zehnder volume flow control combination is suitable for an operating temperature of 10 C up to a maximum of 120 C and a maximum operating pressure of 16 bar. The working condition is permitted for the following medium: Water and ethylene/propylene glycol water mix (max. 50%), ph value Volume flow controller DN15 Mass flow (kg/h) Minimum differential pressure (kpa) Volume flow controller DN25 Mass flow (kg/h) Minimum differential pressure (kpa) Volume flow controller DN32 Mass flow (kg/h) Minimum differential pressure (kpa) Return Flow Fig. 3: Zehnder volume flow control combination Hydraulics 29

30 Zehnder everything you need to create a comfortable, healthy and energy-efficient indoor climate Heating, cooling, fresh and clean air: at Zehnder, you will find everything you need to create a comfortable, healthy and energy-efficient indoor climate. Zehnder s wide and clearly structured portfolio can offer the right product for any project, be it private, public or commercial, new build or refurbishment. And where service is concerned, you ll find that Zehnder is always around you. Heating At Zehnder, heating doesn t just come in the form of designer radiators. We offer solutions in all shapes and sizes, from radiant ceiling panels to heat pumps with integrated ventilation unit. Designer radiators Compact energy station with integrated heat pump Heating and cooling ceiling systems Comfortable indoor ventilation with heat recovery Radiant ceiling systems Cooling Zehnder also offers sophisticated solutions for indoor cooling. These range from cooling ceiling systems to comfortable indoor ventilation with a supply of pre-cooled fresh air. Heating and cooling ceiling systems Compact energy station with heat pump and brine pipe Comfortable indoor ventilation with geothermal heat exchanger for fresh air pre-tempering Radiant ceiling systems Zehnder designer radiators, Zehnder Nestsystems Zehnder heating and cooling ceiling systems, Zehnder Nestsystems Fresh Air Fresh Air a product range with a long tradition at Zehnder. Zehnder Comfosystems provides products and solutions for comfortable indoor ventilation with heat recovery for houses and apartments, for new builds and for renovation projects. Comfortable indoor ventilation Compact energy station with integrated ventilation unit Zehnder Comfosystems Clean Air Zehnder Clean Air Solutions provide Clean Air in buildings particularly prone to dust. In residential applications, the comfortable indoor ventilation provided by Zehnder Comfosystems filters external pollutants out of the air. Comfortable indoor ventilation with integrated fresh-air filter Compact energy unit with integrated fresh-air filter Systems for clean air Zehnder Clean Air Solutions

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32 Z_UK_V1014_RHC_PLD_ZIP_PressFit, en, subject to change without notice Zehnder (commercial) Unit 4 Watchmoor Point Camberley Surrey GU15 3AD Tel. +44 (0) Fax +44 (0) sales@zehnder.co.uk