• COMFORT & SOLAR HEAT GAIN

    We can all appreciate the benefits of working in an environment where the temperature is comfortable. For office buildings in the summer, the optimum temperature is 25°C.

    However, this temperature range can soon be exceeded during the hotter months, due to the effect of solar radiation through glazing. Temperatures as high as 37°C to 42°C have been recorded.

    This can result in an uncomfortably warm environment which can adversely affect the productivity and concentration levels of the occupants inside. In air conditioned buildings uncontrolled solar heat gain can increase cooling loads, plant size and overall running costs.

    In addition, independent studies have shown that productivity increases when people sit near a window, enjoying the benefits of natural daylight. A lack of daylight can result in an over-use of artificial lighting, contributing to internal heat gain.

    Architects and Consultants are increasingly recognizing the part that solar shading systems can play in both enhancing the quality of the internal environment, and saving energy.

    Solar shading systems can be designed to maximize natural daylight whilst controlling solar heat gain and glare.

  • Optimum performance by reducing solar heat gains whilst maintaining acceptable levels of natural daylight.

    • Reduction of cooling loads in summer.
    • Reduction of heating requirements in winter.
    • Potential for striking aesthetic impact.
    • Potential to integrate photovoltaic cells.
    • Solar C brise Soleil
    • Solarfin metal louvre system
    • Bespoke Profile
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Patented louvre clip enables the louvre blades to be adjustable in increments of 15°

Porsche & Volvo Offices, Munich, Germany.

  • An important part of the design process is to consider when it is beneficial to protect glazing from the sun. If glare is controlled by other means, such as internal blinds, it can be useful to allow winter sun into the building to supplement heating and increase light levels. Solar C Brise Soleil is ideal for this, since it can be configured to provide the required protection.

    A simple horizontal Brise Soleil (such as Solar C) is best suited to façades facing between South East and South West, but with careful design Solar C can be effective on most façade orientations.

    Natural light entry and ‘vision out’ must play an important part in the overall design process.

    Consideration needs to be given to the amount of natural light entering the building, as well as the need to have a clear view to the outside.

  • Sunfax is a program that evaluates the effectiveness of alternative solar shading designs, and which permits the selection of the most effective design.

    The Solar C system is a fixed louvre system that can be designed to meet the needs of any building.

    Unlike conventional ‘Z’ section shaped blades, which may reduce both direct and diffused light, the Solar C blade is designed to be effective at controlling solar heat gain whilst allowing through a fair proportion of diffused light between the louvre blades.

    Six blade profiles are available varying in widths from 100mm to 150mm.

    A perforated blade is also available with a width of 110mm.

    The pitch between the blades is normally set at 100 mm but this can be varied to suit the blade size and angle.

    Solar C is normally installed in continuous lengths to fixed rafters projecting from the building. This will provide uniform light entry to the building.

    If a panellised system is preferred, then this is available with profiled end plates which can make a prominent feature to a building.

John Lewis, Cambridge.
Solarfin fitted both to the customer entrance canopy and in front of the facade.

Benenden Hospital, Kent

Benenden Hospital, Kent

Health and Safety Executive, Bootle.
Colt both the supplied the horizontal Solarfin and the supporting steelwork. Colt also provided natural and smoke ventilation, fire curtains, rooflights and weather and screening on this project.

Tate Britain, London.
Controllable Solarfin fins installed on top of Colt Azur rooflight systems.

Arup Fitzrovia, London.
Fixed Solarfin supported by drop rods, and Universal Louvre fitted to plant rooms.

  • On façades from South East to South West, a Solarfin system that is installed in front of the glazing will provide superior performance to a Brise Soleil system, whilst optimising daylight entry and the view to the exterior.

    On more Easterly or Westerly façades, any fixed system will be a compromise due to the fact that the low summer sun angles need to be controlled.

    A controllable Solarfin system is ideal for such façades.

    Although aesthetic considerations play an important part in the design of a building, functionality is critical, both for comfort and energy saving and to meet the legal requirements imposed by Approved Document L2 of the Building Regulations.

    When controllable fins, are fitted vertically in front of a window, as shown below, these may be designed to offer the most effective degree of solar control without compromising light levels on dull days.

  • Controllable fins reduce the likelihood of ‘overshading’ or ‘undershading’ that can happen with fixed solar shading. As shown below, they can be moved to the optimum shading angle depending on the time of day. On dull or overcast days the louvres will automatically open to maximise daylight entry.

    On dull days, light sensors send signals to the control system to fully open the fins to allow the occupants maximum natural daylight and vision to the outside at all times.

    Controllable solar shading is also effective when fitted to glazed rooflights.

  • Colt Solarfin is a fixed or controllable external solar shading system that may be installed either vertically or horizontally in front of the façade.

    It may be combined with other Colt products such as rooflights and glazed façades.

    A Solarfin shading system can reduce solar heat gain, lower air conditioning running costs, and lessen glare whilst maximising the use of natural daylight.

    With over 20 standard profiles, fins are available as one-piece extrusions in widths up to 400mm and as multiple clipped together extrusions in widths up to 1050mm.

    Solarfin louvres may be fixed at any angle and can rotate under motorised control. Spans can be up to 6m without intermediate support and up to 10m with intermediate bracing rods. Fabricated and perforated fins are also available.

    All principal components are manufactured from extruded aluminium alloy type 6063 T6 with stainless steel fixings. Controllable fins can pivot through 120 degrees and can be controlled by astronomical data operating the actuators to track the path of the sun.

  • Sunfax is a specially designed computer program that evaluates the effectiveness of a solar shading system. With this program Colt can assess a system design and provide a bespoke solution to meet all aspects of a project.

    Backed by an experienced technical support team, Colt can work with the customer from the earliest stages of the project to design an aesthetically pleasing, high performance solar shading system.





Asda, Poole.
Fixed Solarfin fitted to vertical steel supports.

Addenbrookes Hospital, Cambridge.
Perforated cladding and perforated Solarfin for screening and ventilation.

  • Colt realize the importance of creativity and individuality when designing a building and offer many bespoke solar systems in such materials as perforated aluminium, wood, terracotta clay, and translucent acrylics.

    UTZ Offices, Berlin, Germany.
    Bespoke vertical solar shading fins that can be manually altered to control internal daylight levels.

    Aldersgate, London.
    Curved horizontal screening fins and panelised louvre panels.


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Clissold Leisure Centre , London.
Vertical Solar C covers the glazing , which can be pivoted at an angle to facilitate easy cleaning of the glass behind.

SUPPORT CLIP

Both a fixed and an adjustable clip are available. The adjustable clip allows complete flexibility of louvre and rafter angle, since the louvre angle can be changed on site.

The patented louvre clip is adjustable in increments of 15°. The action of attaching the louvre blade to the rafter fixes the angle.

Fixed angle clips are also available in 30, 45, 60 and 135°. Clips are available in either grey or translucent.

The plastic clip allows for thermal expansion of the blade and ensures that louvre blades cannot rattle against the rafters.

SUPPORT RAFTERS

Five basic rafter designs are available. Their selection depends on the fixing method and the loadings on the structure.

For any projections less than 1m, the rafter can be cantilevered from the building structure, assuming the windload is not excessive.

Maintenance walkways with kick plates and hand rails can be attached to the rafter to enable access for cleaning.

INSTALLATION

Ideally installation should be carried out by Colt trained installers. If the louvres are installed in continuous lengths, the louvres are packaged up in break down form for on-site assembly.

An adjustment in the louvre system can accommodate building tolerances of up to 10mm.

Particular attention should be paid to suitable fixing locations and the structural integrity of the structure into which the louvre is attached. This should be considered at the early stages of the project.



Trinity and All Saints College, Leeds.
Panellised horizontal Solarfin connected to end plates and fixed back to the curtain walling.

Marlborough House, Leatherhead.
Solar C louvre installed onto Colt glazed pyramids with integrated Colt Firelight ventilators.

Product reference:

Solar C type (select from)
C100, C100p, C110, C140, C150, C150g
(If applicable) Facia panel type (select from)
FP 180, FP 180r, FP 90N

Product description:

Fixed external solar shading system, for installation at (select) angle.

Louvre blades are attached to extruded aluminium box section rafters, with (select) variable/fixed macrolon clips in (select) translucent/grey.

The system is attached to the building structure with extruded aluminium bracing struts and stainless steel brackets.

Material:

Louvre blades, support brackets and mullions are manufactured from extruded aluminium alloy A1MgSi 0.5. Fixings are from stainless steel.

Blade pitch and angle:

(select) mm @ (select) degrees.

Louvre projection:

(select) Horizontal mm / Inclined / Vertical / Horizontal & Vertical / Inclined & Vertical.

Finish:

(select) Mill aluminium / Polyester powder to RAL / Anodised.









Paradise St Car Park, Liverpool
Fixed Solarfin with special ladder mullion system and mitred corners.

Product reference:

Colt Solarfin type
(select from standard range)

CEL 150/34, CEL 200/34, CEL 250/40, CEL 300/50, CEL 350/55, CEL 400/60 and CHL 250/40,

or telephone Colt to discuss your special requirements.

Product description:

(select) Controllable / Fixed external solar shading system, designed to reduce solar glare and solar heat gain.

Extruded aluminium fin profiles are designed to prevent or reduce direct radiation through windows in summer, while keeping visibility through windows as clear as possible.

Material:

Fins and rafters are manufactured from extruded aluminium alloy 6063 T6. Fixings are from stainless steel.

Fin pitch and angle:

(select) mm @ (select) degrees. (Select angle for a fixed system only).

Finish:

(select) Mill aluminium / Polyester powder to RAL / Anodised.

Stainless steel components to be selffinished if applicable.





Product reference:

Colt Solarfin type (select from standard range)

CEL 150/34, CEL 200/34, CEL 250/40, CEL 300/50, CEL 350/55, CEL 400/60 and CHL 250/40,

or telephone Colt to discuss your special requirements.

Product description:

(select) Controllable / Fixed external solar shading system, designed to reduce solar glare and solar heat gain.

Extruded aluminium fin profiles are designed to prevent or reduce direct radiation through windows in summer, while keeping visibility through windows as clear as possible.

Material:

Fins and rafters are manufactured from extruded aluminium alloy 6063 T6. Fixings are from stainless steel.

Fin pitch and angle:

(select) mm @ (select) . (Select angle for a fixed system only).

Finish:

(select) Mill aluminium / Polyester powder to RAL / Anodised. Stainless steel components to be selffinished if applicable.


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Coming Soon

Waters Edge Visitor Centre,
Barton-on-Humber.
Fixed Solarfin louvres fitted to flitch plates to curtain walling.


Castlepoint Shopping Centre, Bournemouth.
Solarfin louvres set onto prefabricated faceted structure.

John Lewis, Cambridge.
Solarfin fitted both to the customer entrance canopy and in front of the facade.

Benenden Hospital, Kent

Bristol Myers Squibb, Liverpool.

Solar Heat Gain Reduction

The Building Regulations (England and Wales) require that “reasonable provision shall be made for the conservation of fuel and power in buildings”. Within this is included a requirement to limit exposure to solar overheating (2002) or excessive solar gains (2006).

This can be an onerous requirement for a highly glazed façade intended to maximise natural daylight entry.

Approved Document L2 provides guidance as to how compliance can be achieved. The guidance changes when the 2006 edition comes into force in April 2006.

A simple approach to compliance is to show that the heat gains to a defined floor area do not exceed a set average over the period between 07.30 and 17.30 in the month of July.

Until April 2006 the set average gain is a solar gain of 25 W/m2. A calculation method is provided in Appendix H to Approved Document L2, 2002 edition.

From April 2006 the set average gain is a total gain of 35 W/m2. The total gain includes the solar gain and casual gains due to people, lights and equipment. No specific calculation method is given, but the recommended data precludes direct use of the previous Appendix H calculation method.

Note: for spaces served by comfort cooling systems, meeting the TER (target CO2 Emission Rate) is sufficient for compliance with Regulation L1 but limiting the total gain makes it easier to meet the TER.

WORKED EXAMPLE

The following example explains the use of solar shading for compliance with clause 1.23 a) of Approved Document L2 (2002) and clause 60 a of draft Approved Document L2A (2006). The calculation presented is from Appendix H (2002) but the general principles apply whichever document is used.

Take a typical modern fully glazed office block as shown, with heat absorbing double glazing and internal blinds to prevent glare. Assume that the floor is open plan except for the enclosed stair cores, which are disregarded. Then:

Perimeter floor area:

Glazed area (SW+SE):

Glazed area (NW+NE):

Using the equation H1 (solar load per floor area):

This solar gain significantly exceeds the acceptable limit of 25 W/m2 (2002) or (35 – casual gain) W/m2 (2006).

There are two basic options available to decrease the solar gain. Reduce the glazing area or provide improved solar protection.

Reducing the glazing area would mean that glazing would be limited to a single strip only 1.2m high on each floor.

Improving the solar protection to achieve 25W/m2 requires an improved correction factor of:

Using equation H3 of Approved Document L2 to calculate the shading coefficient of a system to meet f = 0.27 gives:

Therefore shading coefficient must be less than 0.19.

This can be achieved using the existing glazing and blinds with the addition of an external automatically controlled movable Colt Solarfin system. Due to the effectiveness of the Solarfin system it may be possible to offset some of the additional cost by reducing the glass specification.

On façades from South East to South West, a Solarfin system that is installed in front of the glazing will provide superior performance to a Brise Soleil system, whilst optimising daylight entry and the view to the exterior.

On more Easterly or Westerly façades, any fixed system will be a compromise due to the fact that the low summer sun angles need to be controlled.

A controllable Solarfin system is ideal for such façades.

Although aesthetic considerations play an important part in the design of a building, functionality is critical, both for comfort and energy saving and to meet the legal requirements imposed by Approved Document L2 of the Building Regulations.

When controllable fins, are fitted vertically in front of a window, as shown below, these may be designed to offer the most effective degree of solar control without compromising light levels on dull days.

Controllable fins reduce the likelihood of ‘overshading’ or ‘undershading’ that can happen with fixed solar shading. As shown below, they can be moved to the optimum shading angle depending on the time of day. On dull or overcast days the louvres will automatically open to maximise daylight entry.

On dull days, light sensors send signals to the control system to fully open the fins to allow the occupants maximum natural daylight and vision to the outside at all times.

Controllable solar shading is also effective when fitted to glazed rooflights.


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Green Benefits of COLT Sunshades

  • 1. Colt Sunshades are manufactured from high strength aluminium alloy (6063 T5). This product is 100% recyclable material with high recycle content.
  • 2. Owing to its highly inert property, this product requires minimal care and maintenance; hence, the initial investment is paid back by low maintenance cost.
  • 3. By preventing direct solar radiation, Colt Sunshades ultimately reduce electricity expense from the air conditioning system and provide pleasant working environment inside and around buildings.
  • 4. Colt Sunshades can be integrated into any building to eliminate the need for good insulation from pricy glazed windows, which also require heavy and expensive support structures to install glazed windows on building exterior.
  • 5. Colt Sunshades help enhance the architecture of building structure; hence, reduce the need for frequent exterior renovation.
  • 6. Colt Sunshades minimize the glare from direct sun exposure and simplify the building equipment and materials (e.g., expensive glazed windows, interior sun shades, etc.) to meet glare reduction requirements.
  • 7. Colt Sunshades help adjust proper intensity of sunlight for human’s comfort to promote better working efficiency and interior surrounding.
  • 8. A wide selection of color shades is available to meet any aesthetic demands and functionality.
  • 9. Installation of Colt Sunshade system is easy. This allows fast relocation and reinstallation to facilitate changing demands of building functionality.
  • 10. With our gathered information of green saving from worldwide locations, energy saving can be estimated precisely and all building parameters can be included to optimize Colt Sunshade installation.