Abstract:
Short term testing of the SDHW system components is an essential prerequisite
for assessing the system’s long-term thermal performance. Relevant
performance parameters are therefore, crucial in recommending systems outputs
and feasibility. Short term testing methods based on ANSI/ASHRAE and ISO
standards testing methods and the mathematical system energy input/output
models used showed sensitivity to variation of the day length used in testing and
to different levels of irradiance. On the bases of the thermal performance testing
carried out for a SDHW system and the outcomes of the day-by-day long-term
performance prediction, a new mathematical system energy model is proposed
which may reduce the number of tests required, minimizes the dependency on
the day length and the sensitivity of the levels of irradiance.
