Paper Conference

Proceedings of Building Simulation 2009: 11th Conference of IBPSA

     

A SIMPLE CHILLER MODEL FOR HOURLY TIME STEP APPLICATIONS

Gerhard Zweifel

DOI: https://doi.org/10.26868/25222708.2009.0420-427
Abstract: Lucerne University of Applied Sciences and Arts School of Engineering and Architecture 6048 Horw, Switzerland The last requirement is essential for the reason of discrimination: machines with a better performance For the use in Swiss standards on energy performance of cooled buildings, a chiller model for an hourly time step calculation was needed. Unlike the models found in a literature review, the model aimed at should be based only on the information available from standard performance rating, i.e. COP values for 4 rating conditions. To perform satisfactorily, the semi-physical/semiempirical model had to be refined, which requires the addition of one additional COP value as an input. This refined model shows accurate results for most shall result in a better value. The Swiss standard on ventilation and air conditioning system requirements demands chillers with a higher COP value in part load conditions that at full load, as shown in table 1. The effect of this on the energy consumption and the influence of the system operating conditions on it shall be visible in the calculation result. Table 1 COP requirements for chillers according to Swiss standard chiller types that were available for testing. In this paper, the model and its development is explained, and its performance for a range of chiller types upon an application to an annual load profile of a real building is shown.
Pages: 420 - 427
Paper:
bs2009_0420_427