23 September 2011

PERFORMANCE ANALYSIS OF A VARIABLE SPEED COMPACT GSHP WITH DESUPERHEATER


When thinking on the thermal energetic demand for low energy houses, two heat
pumps have been traditionally used: one for heating and cooling and the second one for domestic hot water. During the last two decades these two functions have been combined
by attaching a desuperheater to the single frequency GSHP originally meant for space heating. Nevertheless, a variable speed GSHP can cope better with partial heat demand providing lower overall energetic consumption with no need of extra backup systems and buffer tanks which are both thermal and economically expensive. In this study, a prototype GSHP with desuperheater is examined. In order to determine an operation strategy aiming to increase the yearly performance factor, a refrigeration cycle simulation is developed, which takes into account detailed thermodynamic information as well as geometrical features of
each of the components.