Discontinuous Efficiency Curves

Robert Hausner

18.6.1

Description of the Specific Test and Test Procedure

Within EN 12975-2, the following tests and calculation procedures are concerned with discontinuous efficiency curves of polymeric collectors with temperature limiting measures, such as thermotropic layers, temperature-controlled ventilation, or other active or passive measures.

In the following chapters of EN12975 second-order dependencies on the temper­ature difference (tm — ta) (tm: middle temperature of the fluid in the collector, ta: ambient temperature) are established (Table 18.3).

A simple linear dependency on this temperature difference is established in Chapter C.2 [Determination of stagnation temperature; Formula (C.1)].

Table 18.3 Chapters of EN12975 for which second-order dependencies on the temperature difference are established.

Chapter

Formula

6.1.4.8 Computation of collector output

(7), (8)

6.3.4.8.2 The collector model

(32)

6.3.4.8.4 Graphical presentation of test results

(32.1)

D.3 Test results

(D.3), (D.4)

Annex H: Comparison of the collector model of 6.1 to the collector model of 6.3

(H.1), (H.2)

18.6.2

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