Air-conditioning and Cooling technology Page 76

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As with the absorption heat pump, the heat quantity diverted in the condenser is more or less identical to that of the heat supplied to the evaporator, and the heat diverted in the absorber is more or less the same as that supplied to the generator. The heat quantity Q1' absorbed from the evaporator is set equal to 1. The heat Q2 = 2 / (1 - 2) from the absorber can then be diverted to the user. The condenser heat Q0 is also equal to 1; the heat Q2 = 2 /(1 - 2) must be directed to the generator. The heat relationship 2 typically lies at 0.40 to 0.45.

Closing remarks:

The attempt to develop a demonstration model for solar cooling during the course of the SERVITEC project has shown two things:

  1. It is in principle entirely possible to realise the theoretical considerations from a technical standpoint. This takes as a prerequisite, of course, the application of high quality electronic measuring devices. The calculation of energy balances also demands corresponding software and a PC for the recording of measurement data, its evaluation and optical reproduction.

  2. The solar energy at our disposal during a presentation in Barcelona an October 3rd, 2000 was not sufficient to attain the optimal expulsion temperatures of the generator with the help of two vacuum collector tubes.
    We were, however, able to solve this problem in two ways. First, the solar collector surfaces could be correspondingly enlarged. However, this would only be of help where sunshine was present. A more productive solution would be the installation of a second energy source for re-heating, whereby the solar energy would function as a pre-heating step in the work process.

Fig. 60 Demonstration model of a solar absorption refrigeration machine

The present model is already very suitable for the demonstration of the functionality of a solar absorption refrigeration machine, but must be expanded with industrial components, especially a re-heating step, in order to sufficiently prepare prospective service technicians for what awaits them one day in practice.

The contribution of the Fraunhofer Institute for Solar Energy Systems in Freiburg, which is included in the appendix to this MODULE III, shows, however, that even industrially produced solar air-conditioning plants only appear sporadically, and therefore still have the character of pilot plants.


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