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IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

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<strong>IEA</strong> SHC Task 38 <strong>Solar</strong> Air Conditioning <strong>and</strong> Refriger<strong>at</strong>ion Subtask A Report, D<strong>at</strong>e: November 2010<br />

2 System Design<br />

Figure 2 shows the functional scheme of the solar system. Hot w<strong>at</strong>er is produced in the 57.6<br />

m 2 fl<strong>at</strong> pl<strong>at</strong>e collectors, which are used as roof for the CoolCabin. The collector field is<br />

aligned south with a slope of 11°. The collector pu mp P1 drives the hot w<strong>at</strong>er to the he<strong>at</strong><br />

exchanger. Pump P2 delivers the medium in the secondary solar cycle to the hot w<strong>at</strong>er<br />

storage tank, which has a volume of 2000 liter. Valve V1 controls the position (top or<br />

medium) where the hot medium is str<strong>at</strong>ified into the storage.<br />

In summer, when there is a cooling dem<strong>and</strong>, the hot w<strong>at</strong>er flows to valve V4 through pump<br />

P3 to the absorption cooling machine (ACM). In winter, when space he<strong>at</strong>ing is needed, the<br />

hot w<strong>at</strong>er flows through valve V3 pumped by P6 directly to the distributor.<br />

The ACM has a maximum cooling capacity of 17.6 kW, a r<strong>at</strong>ed COP of 0.65 <strong>and</strong> was<br />

manufactured by the Japanese company Yazaki. The hot w<strong>at</strong>er loop is piped back to the hot<br />

w<strong>at</strong>er storage or mixed in V4 with the flow to control the hot w<strong>at</strong>er inlet temper<strong>at</strong>ure.<br />

The cooling tower can work in two different oper<strong>at</strong>ion modes. Either the recooling w<strong>at</strong>er is<br />

going directly to the ACM through P5 or in free cooling mode to the he<strong>at</strong> exchanger by P7.<br />

Switching between chiller <strong>and</strong> free cooling is done with the valves V5 <strong>and</strong> V7. The chilled<br />

w<strong>at</strong>er produced by the ACM or from the he<strong>at</strong> exchanger (in case of free cooling) flows into a<br />

200 liter hydraulic switch <strong>and</strong> further on to the distributor. Through the radiant ceiling system<br />

of the office building the chilled w<strong>at</strong>er is distributed.<br />

Figure 2: System scheme of the CoolCabin<br />

page 4

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