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CHESS is a PC-based dynamic simulation tool for Consumer Heating Systems especially designed for District Heating. The tool is also very useful for Heating Systems in general where a great cooling of the hot water is important like in systems with heat pumps.
The CHESS-concept is based on a modular structure where the system you want to analyze can be built together from separate models of the actual components in the system. The basic models take care of the effect of varying water flows and its influence on the heat transfer coefficients.
At this stage of the programme development the linking procedures have to be done by experts. More developing work is needed to enhance the user friendliness to a level where a non-expert may build his own system configurations. The programme in hand contains two separate executive program-versions of a chosen "reference system". These executive programmes may be operated very easily by non-experts.
The CHESS-concept may be used for several purposes like:
- Optimization of temperature differences and the water cooling in the system
- Evaluation the regulativity of the system
- Choosing the right regulator
- Adjusting the regulator
- Evaluating of regulating valves
- Choosing the right values
- Choosing the right place for the sensors
- Evaluating the regulating consequences of hysteresis etc
The concept makes it possible to evaluate the whole system operation on the designstage and thereby eliminate bad system configurations at an early stage. The CHESS-concept may also be used to analyze existing bad working systems to see the effects of possible changes of the system. The simulation program is adapted from a simulation tool named CYPROS SIM which is a program for solving nonlinear dynamic problems.
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