Active glass with circulating water chamber

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  • Publicado : 21 de mayo de 2011
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INDEX

1. BUILDING DESCRIPTION

2. INTELLIGLASS SYSTEM FOR FAÇADES AND GLASS ROOFS.

3. PRINCIPLE SCHEMA AND PROPOSAL.
3.1 Objective.
3.2 Thermal Comfort.
3.3 Sectoring.
3.4 Principle schema.

4. ENERGY MANAGEMENT
1. Sun radiation incident to the building.
2. Thermal inertia and buffering.
3. Homogenization of glass façades.
4.Free cooling.
5. Energy demand.

1. BUILDING DESCRIPTION

This is a sample study from a building in Barcelona but we can’t share the actual data. The purpose of this is to show how we could do a preliminary study based on a real case

2. INTELLIGLASS SYSTEM FOR FAÇADES AND GLASS ROOFS

Heat transfer mechanisms over a glass surface are: conduction, convection and radiation. Therelevant parameters that characterize glass are U and g. Transmittance (U) refers to the thermal isolation of the conduction and convection mechanisms. The lower the U, the less heat transfer transmission by the effect of the difference on temperatures between the exterior and the interior. The solar factor (g) makes reference to the capacity of blocking sun radiation. The lower the g, the less is theheat transmission through the glass closure. While the desired condition for a glass is to have a value of U is as low as possible, to avoid thermal looses in winter time or thermal gains in summer time and the case is not the same for the solar factor g. One glass with a low solar factor g could be favorable in summer time to block solar radiation but, however it could be harmful on the wintersunny days in which we would prefer to get inside this nice solar radiation. Also, glass with low g is always together with low light transmission so it is required to use artificial lighting in winter time.

Intelliglass system avoid these two defects on the double glazing with air chamber and low solar factor with an active glazing system which is able to manage the energy of the building. Waterhas the property of being opaque to the infrared radiation, so by using a water layer in circulation, a 60% of the solar radiation energy can be absorbed with transparent glass. The water captured by the water will be dissipated by evaporative refrigeration or night dissipation at a very low energy cost.

Intelliglass offers several alternatives to optimize the performance depending on theexterior climate condition and the internal thermal loads.
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Figure 2. IntelliGlass Products.

1 RadiaGlass: It is a double glazing system with a water chamber in circulation. It is to be used in all kinds of façades or glass roofs in warm or tempered climates and in internal partitions for heating or cooling the building.
2 iThermGlass: It is a triple glazing system with a water chamber incirculation towards the interior and air chamber to the exterior. It is to be used in façades and glass roofs in cold climates region depending of the building internal thermal loads.
3 Photovoltaic RadiaGlass: It is either a double or triple glazing system with photovoltaic cells in the exterior laminated glass. Water cools off the photovoltaic cells improving greatly their performance. To be usedin façades and glass roofs exposed to the solar radiation.

3. PRINCIPLE SCHEMA AND PROPOSAL

3.1 Objectives.

The main goal of the system is to create a volumetric envelope of the building to reduce the energy consumption on it without giving away the advantages of the use of glass. To do so, the Intelliglass system offers a seamless integration of the product in the façade toeliminate the solar thermal load before it gets inside the building. Another objective is to compensate the internal thermal loads by using Radiaglass partitions to divide the interior space of the building and also to create isotherm envelopes for the rooms to avoid air flows in circulation and to increase thermal comfort. Finally and to the south façade, photovoltaic RadiaGlass can be used to block...
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