Enhancing the efficiency of a steam jet ejector chiller for chilled ceiling

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F22%3APU144846" target="_blank" >RIV/00216305:26110/22:PU144846 - isvavai.cz</a>

Výsledek na webu

<a href="https://www-sciencedirect-com.ezproxy.lib.vutbr.cz/science/article/pii/S1359431122004665" target="_blank" >https://www-sciencedirect-com.ezproxy.lib.vutbr.cz/science/article/pii/S1359431122004665</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.applthermaleng.2022.118512" target="_blank" >10.1016/j.applthermaleng.2022.118512</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Enhancing the efficiency of a steam jet ejector chiller for chilled ceiling

Popis výsledku v původním jazyce

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 (T-water,T-sup) and thus the evaporation temperature. Experiments were used to verify a mathematical model of SJEC. The model was combined with T-water,T- 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 degrees C and T-water,T- sup of 7 degrees C, assuming a fancoil. Increasing T-water,T- sup to 9 degrees C, which was considered to be the lowest T-water,T- 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 m(2) of room area. Further increasing T-water,T- sup to 15 degrees C improved the COP by 50% compared to the fancoil, while covering cooling loads of at least 40 W per m(2). The estimated reduction in generation temperatures due to increased COP was up to 12% (T-water,T- sup = 9 degrees C) and 37% (T-water,T- sup = 15 degrees C). This means a lower energy input needed for the cooling machine, which allows a smaller solar collector area.

Název v anglickém jazyce

Enhancing the efficiency of a steam jet ejector chiller for chilled ceiling

Popis výsledku anglicky

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 (T-water,T-sup) and thus the evaporation temperature. Experiments were used to verify a mathematical model of SJEC. The model was combined with T-water,T- 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 degrees C and T-water,T- sup of 7 degrees C, assuming a fancoil. Increasing T-water,T- sup to 9 degrees C, which was considered to be the lowest T-water,T- 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 m(2) of room area. Further increasing T-water,T- sup to 15 degrees C improved the COP by 50% compared to the fancoil, while covering cooling loads of at least 40 W per m(2). The estimated reduction in generation temperatures due to increased COP was up to 12% (T-water,T- sup = 9 degrees C) and 37% (T-water,T- sup = 15 degrees C). This means a lower energy input needed for the cooling machine, which allows a smaller solar collector area.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Applied Thermal Engineering

ISSN

1359-4311

e-ISSN

—

Svazek periodika

211

Číslo periodika v rámci svazku

2022-07-05

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

15

Strana od-do

1-15

Kód UT WoS článku

000796196100004

EID výsledku v databázi Scopus

2-s2.0-85128555811