It consists of a water-flowed pipes with vertical fins and one or more radial fans. The total surface of the heat exchanger is roughly two times the surface of the triple glazing. For a Window of 2 x 2.5m the heat exchanger surface will be around 10m2.
The low noise radial fans provide for an air speed in the heat exchanger up to 5-6m/s, which results in a heat transfer coefficient up to 35 W/m2.K, sufficient to cool or heat the air in the cavity to the desired temperature even for extreme temperatures and sun radiations.
The heat removal can reach over 2000 W for the present setup.
The advantage of HyWin equipped room is, that it is sufficient to compensate for the internal heat sources.
Our measurements confirm literature values, which suggest that the overall heat transfer coefficient from conduction and radiation on the inner safety glass is about 8-11 W/m2K. In the Test Unit with an active window size of 4.5 m2 we reach a heat flows up to 200-250 W. The process is relatively slow, comparable to heating/cooling ceilings.
The HyWin concept is to collect the energy from the facade during the hot period and store it in the earth probes for use in cold periods.
The annual simulation shows that for typical high-rise building and average storage capacity of the earth probes the energy collected might even exceed the winter usage.
The test unit has been designed based on previous investigations, laboratory units and simulations.
The concept for the Test Unit is to operate and measure a realistically large HyWin unit and attach it to a thermally well-defined room. We have decided to use a trailer which gives flexibility regarding the location and orientation.
The heat exchanger is provided with hot and cool water from a second, smaller trailer equipped with the necessary hydraulic equipment, cooling, and heating devices. Both trailers are connected with electrical, hydraulic and data links.
The effect of the sunshield is tested using a remotely controlled sunblind which can bea adjusted in position and angle.
The infrastructure trailer is protected by a tent, so that the side walls can be kept open for cooling. It has been operated 24/7 since beginning October 2020.
Measurement points inside and outside the test unit monitor temperature at different locations, solar radiation, humidity, light intensity, power consumption, water flow and more. The data is collected and stored on a digital datalogger. The energy balance and further important system parameters are calculated inline. A universal controller with dedicated software package is used to control all the devices and to maintain the set temperature. A remote setup allows monitoring and operation via internet from external locations.
Important milestones in the development of the HyWin Glass Facade Solution.
The latest news on HyWin and its team members.
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Conversely, in cold days the temperature in the cavity may be raised above the room temperature, resulting in a pleasant temperature up to the window. Today’s glass facade use some sort of warm air curtain to avoid unpleasant cold pane.
In essence the overall heat balance of a room consists of heat from:
The first four components of the balance are given by the room design and its use. The last component, the heat flow through the inner glass pane is controls the overall balance in the room by adapting the temperature in the cavity and thus the heat flow.