Blar i NTNU Open på forfatter "Cao, Guangyu"
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Energy efficient airflow distribution methods for surgical microenvironment control in operating rooms
Bi, Yang (Doctoral theses at NTNU;2024:13, Doctoral thesis, 2024)With approximately 300 million surgeries performed worldwide each year, the operating room (OR) environment plays an important role in creating a satisfactory setting for all occupancies. However, there are currently several ... -
Estimating the impact of indoor relative humidity on SARS-CoV-2 airborne transmission risk using a new modification of the Wells-Riley model
Aganovic, Amar; Bi, Yang; Cao, Guangyu; Drangsholt, Finn; Kurnitski, Jarek; Wargocki, Pawel (Peer reviewed; Journal article, 2021)A novel modified version of the Wells-Riley model was used to estimate the impact of relative humidity (RH) on the removal of respiratory droplets containing the SARS-CoV-2 virus by deposition through gravitational settling ... -
Evaluation of different mixing airflow distribution methods for operating rooms
Pedersen, Christoffer (Master thesis, 2019)Bakgrunn: Nyere studier har vist at det er mulig å oppfylle det ultra-rene kravet(10CFU/m3) for operasjonsrom(OR) utstyrt med blandingsventilasjon(MV). Variasjoner i målt CFU-nivå eksisterer imidlertid mellom operasjoner, ... -
Evaluering av drift, vedlikehold, inneklima og helseplager på norske skoler
Feness, Maren Pedersen (Master thesis, 2020)Folkehelseinstituttet (FHI) mener at inneklimaproblemer i skoler svært ofte kan være knyttet til dårlig drift og vedlikehold, som kan forårsake helseutfordringer fordi bygninger i dårlig stand får et inneklima som kan gi ... -
Experimental and simulated evaluations of airborne contaminant exposure in a room with a modified localized laminar airflow system
Cheng, Zhu; Aganovic, Amar; Cao, Guangyu; Bu, Zhongming (Peer reviewed; Journal article, 2021)The traditional mixing ventilation is not an energy effective approach to remove indoor air pollutants, maintain breath zone air quality, and control the airborne transmission. This study investigated the potential of a ... -
Experimental measurement of airflow distribution in operating rooms
Asuero Von Munthe Af Morgenstierne, Marina (Master thesis, 2023)Studies show that ventilation systems take an important role to reduce surgical site infection in hospitals. However, the ventilation system itself might not be enough. Staff's movement around the room, positioning of the ... -
Experimental measurements of surgical microenvironments in two operating rooms with laminar airflow and mixing ventilation systems
Cao, Guangyu; Kvammen, Ingeborg; Hatten, Thea Amalie Solberg; Zhang, Yixian; Stenstad, Liv-Inger; Kiss, Gabriel; Skogås, Jan Gunnar (Peer reviewed; Journal article, 2020)At present, laminar airflow (LAF) systems and mixing ventilation (MV) systems are two commonly used ventilation solutions for operating rooms (ORs) to ensure the required indoor air quality. However, recent studies have ... -
Experimental study of the airflow distribution in a room with heating equipment
Polak, Joanna (Master thesis, 2015)Energy consumption in building sector has led to a great need for energy saving and energy efficient solutions for buildings. Next generation of buildings should apply high energy performance solutions in order to decrease ... -
Experimental study of the interaction between thermal plumes and human breathing in an undisturbed indoor environment
Cheng, Zhu; Cao, Guangyu; Aganovic, Amar; Li, Baizhan (Peer reviewed; Journal article, 2020)This study characterized the interaction between human thermal plume and breathing air flow while people are sitting in a quiescent indoor environment. A sitting breathing thermal manikin was developed to mimic a real ... -
Experimental study of the performance of protected zone ventilation used for a reception space
Szopa, Aleksandra Barbara (Master thesis, 2015)The objective of this study was to examine the possibilities for the downward plane jet to separate two zones with different pollution concentration. This project work is based on technique called protected zone ventilation ... -
Experimental study on the effect of exhaust airflows on the surgical environment in an operating room with mixing ventilation
Xue, Kai; Cao, Guangyu; Liu, Meng; Zhang, Yixian; Pedersen, Christoffer; Mathisen, Hans Martin; Stenstad, Liv Inger; Skogås, Jan Gunnar (Peer reviewed; Journal article, 2020)Due to the requirements of indoor environment parameters, including temperature, humidity, air speed and indoor quality, the design of the surgical environment is a very complex task. However, with limited studies on the ... -
Experimental study on the effect of ventilation airflow rate and separation distance on the risk of airborne COVID-19 infection
Ruud, Mathilde (Master thesis, 2022)Koronapandemien har vart i nærmere tre år og påvirket menneskers liv med inngripende tiltak for å redusere smitte. Viruset har fortsatt å utvikle seg, selv med forholdsregler og distribusjon av vaksiner. Eksperter fra hele ... -
Experimental study on the exposure level of surgical staff to SARS-CoV-2 in operating rooms with mixing ventilation under negative pressure
Bi, Yang; Aganovic, Amar; Mathisen, Hans Martin; Cao, Guangyu (Peer reviewed; Journal article, 2022)The purpose of this study was to reveal the exposure level of surgical staff to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) from the patient's nose and wound during operations on COVID-19 patients. The ... -
Experimental Study on the Surgical Microenvironment in an Operating Room with Mixing Ventilation under Positive and Negative Pressure
Bi, Yang; Heggebø, Frida Josefine; Harsem, Trond Thorgeir; Mathisen, Hans Martin; Aganovic, Amar; Cao, Guangyu (Chapter, 2021)Due to the outbreak of Covid-19, negative pressure operating room (NPOR) are strongly recommended to be applied to prevent spreading virus from infected patients to adjacent rooms during surgery procedures. However, there ... -
Experimental study on the thermal plume from a surgeon in an operating room with mixing ventilation during COVID-19 pandemic
Heggebø, Frida Josefine; Bi, Yang; Harsem, Trond Thorgeir; Mathisen, Hans Martin; Cao, Guangyu (Chapter, 2021)Following the outbreak of COVID-19 (SARS-CoV-2) in 2019, studies show positive results in protecting the surgical staff from patients infected by COVID-19 in operating rooms (ORs) with negative pressure. A negative pressure ... -
Field investigation of thermal comfort level of patients and surgical staff in operating rooms at St Olavs hospital
Helena Kuivjõgi (Master thesis, 2019)I helsetjenester og sykehusmiljøer er det viktig å kunne forutsi termisk komfort som en parameter for inneluftkvalitet. Ustabile termiske forhold er kritiske i operasjonsrommet og kan redusere arbeidseffektiviteten og øke ... -
Field investigations of the indoor air quality regarding the potential health effects in energy efficient buildings during the heating season
Solberg, Karoline Veum (Master thesis, 2016)In the search for energy reduction in the building sector, the focus on energy efficient buildings is increasing. In addition, people spend up to 90% of their time indoors. Norwegian office buildings experience low levels ... -
Identifying key design parameters of the integrated energy system for a residential Zero Emission Building in Norway
Nord, Natasa; Qvistgaard, Live Holmedal; Cao, Guangyu (Journal article; Peer reviewed, 2016)This study examined an integrated solution of the building energy supply system consisting of flat plate solar thermal collectors in combination with a ground-source heat pump and an exhaust air heat pump for the heating ... -
The impact of air change rate on the air quality of surgical microenvironment in an operating room with mixing ventilation
Zhang, Yixian; Cao, Guangyu; Feng, Guohui; Xue, Kai; Pedersen, Christoffer; Mathisen, Hans Martin; Stenstad, Liv-Inger; Skogås, Jan Gunnar (Peer reviewed; Journal article, 2020)Transmission of airborne microbe-carrying particles (MCPs) is one of the key factors causing surgical site infection during surgical procedures. In operating rooms (ORs) with mixing ventilation, air change rate may determine ... -
Indoor air quality, ventilation and health effects in Norwegian schools
Ekeland, Katrine Rasmussen (Master thesis, 2018)ABSTRACT It is well known that a good indoor climate is important for health, well-being and learning. Many Norwegian school buildings experience problems with poor indoor climate, often due to lack of maintenance. The ...