A computational model for the detailed design of finned-tube heat exchangers is presented. Coils are discretised into tube elements for which the governing equations are solved using local values of temperature, pressure, physical properties and heat transfer coefficients. Single phase, condenser and evaporator cases can be treated using water, R22, R134a, and various refrigerant mixtures based on R32, R125, and R134a.
NEXT 21 is the experimental residential building ,completed in October 1993 at Osaka. Main theme of this project is to create comfortable housing for early 21th century life without the increase of stress to urban environment. For this purpose many experimental design ,such as, earth covered roof , ecological garden, greenery for wild birds and many efficient mechanical systems were applied to this building.
The aim of this work is the realization of a design tool, which is a multiple model software called « CODYRUN », suitable for professionnals and usable by researchers. The original aspect of this software is that the designer has at his disposal a wide pa
Tests were conducted on two instrumented air-cooled water chillers (15 kW and 30 kW cooling capacity). Refrigerants evaluated included R22 as the baseline fluid, R407C and R410B. When testing with R407C, the retrofit procedure did not involve any major hardware change. The results with the first chiller equipped with a counter-current plate evaporator showed that both capacity and EER are maintained within 5%. The second chiller, which was not equipped with a counter-current evaporator showed poorer results.
An approach to the steady-state simulation of heat pumps and refrigerating equipment is presented. Novel features of the proposed model are the strategy and formalism adopted in the programme development. Individual mathematical models for component design are linked to enable the simulation of a basic vapour compression cycle. This paper introduces some of the component modules, which can be used for pure as well as mixed refrigerants.
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