首页|Enhancing the efficiency of a steam jet ejector chiller for chilled ceiling
Enhancing the efficiency of a steam jet ejector chiller for chilled ceiling
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NSTL
Elsevier
Steam jet ejector chillers (SJECs) can be a suitable cooling technology in buildings where solar heat gains constitute a significant part of the cooling load。 In this study， an SJEC was combined with a radiant chilled ceiling (CC) instead of traditionally used convective cooling terminals in an effort to increase the coefficient of performance (COP) by increasing the supply water temperature to the terminal (Twater，sup) and thus the evaporation temperature。 Experiments were used to verify a mathematical model of SJEC。 The model was combined with Twater，sup obtained from heat transfer calculations in three types of CC performed by a verified software。 The COP of the ejector cooling system was 0。25 and 0。38 for R718 (water) and R1233zd， respectively， at a generation temperature of 130 °C and Twater，sup of 7 °C， assuming a fancoil。 Increasing Twater，sup to 9 °C， which was considered to be the lowest Twater，sup theoretically possible for CC involving pipes underneath the surface， improved COP by up to 14% while providing a maximum cooling capacity of about 80 W per m2 of room area。 Further increasing Twater，sup to 15 °C improved the COP by 50% compared to the fancoil， while covering cooling loads of at least 40 W per m2。 The estimated reduction in generation temperatures due to increased COP was up to 12% (Twater，sup = 9 °C) and 37% (Twater，sup = 15 °C)。 This means a lower energy input needed for the cooling machine， which allows a smaller solar collector area。
NSTL
Elsevier
