Persona: Berlanga Cañete, Félix Antonio
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Berlanga Cañete
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Félix Antonio
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Publicación Assessment of displacement ventilation systems in airborne infection risk in hospital rooms(Public Library of Science, 2019-01-30) Villafruela, José Manuel; Olmedo, Inés; Berlanga Cañete, Félix Antonio; Ruiz de Adana, Manuel; https://orcid.org/0000-0003-0491-4371; https://orcid.org/0000-0002-7890-7505Efficient ventilation in hospital airborne isolation rooms is important vis-à-vis decreasing the risk of cross infection and reducing energy consumption. This paper analyses the suitability of using a displacement ventilation strategy in airborne infection isolation rooms, focusing on health care worker exposure to pathogens exhaled by infected patients. The analysis is mainly based on numerical simulation results obtained with the support of a 3-D transient numerical model validated using experimental data. A thermal breathing manikin lying on a bed represents the source patient and another thermal breathing manikin represents the exposed individual standing beside the bed and facing the patient. A radiant wall represents an external wall exposed to solar radiation. The air change efficiency index and contaminant removal effectiveness indices and inhalation by the health care worker of contaminants exhaled by the patient are considered in a typical airborne infection isolation room set up with three air renewal rates (6 h-1, 9 h-1 and 12 h-1), two exhaust opening positions and two health care worker positions. Results show that the radiant wall significantly affects the air flow pattern and contaminant dispersion. The lockup phenomenon occurs at the inhalation height of the standing manikin. Displacement ventilation renews the air of the airborne isolation room and eliminates the exhaled pollutants efficiently, but is at a disadvantage compared to other ventilation strategies when the risk of exposure is taken into account.Publicación Experimental assessment of different mixing air ventilation systems on ventilation performance and exposure to exhaled contaminants in hospital rooms(Elsevier, 2018-08-23) Berlanga Cañete, Félix Antonio; Olmedo, Inés; Ruiz de Adana, M.; Villafruela, José Manuel; San José, J. F.; Castro, F.; https://orcid.org/0000-0003-1527-658X; https://orcid.org/0000-0002-7890-7505; https://orcid.org/0000-0003-0491-4371This study evaluates the convenience of the use of four different mixing ventilation configurations in individual hospital rooms (IHR) based on ventilation performance and health workers (HW) exposure to the contaminants released by a confined patient (CP). Two supply configurations: grilles in the upper part of a wall (G) and swirl ceiling diffusers (S), combined with two different exhaust grilles positions in the opposite wall: upper part (U) and lower part (D) are tested using typical IHR set up. Occupants are represented by thermal breathing manikins, CP lies on a bed while HW stands close to it. Three air renewal rates are tested to determine their influence in the studied variables, 6, 9 and 12 ACH covering the whole range of ventilation requirements of such spaces. The experimental conditions considering the thermal comfort of the occupants are taken into account. Different ventilation configurations create different air distribution patterns inside the room. G configurations lead to high HW transient exposure values while S maintain low values that decrease when ACH is increased, so this second configuration is preferred for IHRs. Results are also compared with a displacement ventilation (DV) study highlighting the convenience of this strategy for IHRs.Publicación Experimental evaluation of thermal comfort, ventilation performance indices and exposure to airborne contaminant in an airborne infection isolation room equipped with a displacement air distribution system(Elsevier, 2017-11-20) Berlanga Cañete, Félix Antonio; Ruiz de Adana, M.; Olmedo, Inés; Villafruela, José Manuel; San José, J. F.; Castro, F.; https://orcid.org/0000-0003-1527-658X; https://orcid.org/0000-0003-0491-4371; https://orcid.org/0000-0003-0491-4371This study is focused on determining the convenience of the use of displacement ventilation strategy in airborne infection isolation rooms (AIIRs). Thermal comfort of the occupants of the chamber, ventilation and contaminant performance indices and the exposure of the health worker (HW) to the contaminants exhaled by the confined patient (P) are considered in a typical AIIR set up with two thermal breathing manikins and a radiant wall simulating an external wall. Three air renewal rates are tested to determine their influence in the studied variables. Results show that ventilation performance, contaminants and general comfort indices for both manikins perform well in the cases studied. Lockup phenomenon associated with displacement ventilation occurs above P but it has a low influence on contaminant exposure of HW because of the influence of the convective boundary layer of HW. The influence of the radiant wall could lock the air path near the exhaust grille.Publicación Experimental variation of the personal exposure in a hospital room influenced by wall heat gains(Elsevier, 2019-03-25) Olmedo, Inés; Berlanga Cañete, Félix Antonio; Villafruela, José Manuel; Ruiz de Adana, M.; https://orcid.org/0000-0003-1527-658X; https://orcid.org/0000-0003-0491-4371; https://orcid.org/0000-0002-7890-7505Homogenous indoor temperature of the walls in hospital rooms may be a difficult condition to be reached. Solar radiation increases heat loads in building walls, especially glazed walls, increasing their superficial temperature. This paper aims to investigate the influence of a wall heat gain, simulated experimentally by a radiant wall (RW), on the distribution of indoor exhaled contaminants and therefore the exposure to a person. An experimental setup of a single hospital room is considered with a patient in repose (PR) being the source of exhaled contaminants, and a health worker (HW) standing and being the exposed person. Four different positions of HW relative to PR and RW are studied. The experiments are carried out using 6 and 12 air changes per hour (ACH) and with active and inactive RW, simulating sunny and shaded conditions of an external wall. The concentration of exhaled contaminants is measured in the microenvironment and the inhalation of HW. The exposure of HW to the exhaled contaminants is compared for a total of 16 experiments. Results show that wall heat gains significantly change the distribution of exhaled contaminants. RW active generates “clean” and “polluted” areas of exhaled contaminants at both sides of the bed that changes when using 6 or 12 ACH. Moreover, with RW active, the use of 12 ACH not always leads to a decrease of HW exposure. The intake fraction, IF, is a more suitable index than the personal exposure, einh, since illustrates the dilution of inhaled contaminants respect to the source.Publicación Exhaled contaminant concentration data in a hospital room influenced by external heat gains(Elsevier, 2019-05-18) Olmedo, I.; Berlanga Cañete, Félix Antonio; Villafruela, José Manuel; Ruiz de Adana, M.A hospital room is simulated using two breathing thermal manikins representing a health worker (HW) and a patient in repose (PR). The PR exhales R134a simulating small exhaled particles (<5 μm) and the contaminant concentration around and in the inhalation of HW is measured during a period of 2 hours per experiment. The room is climatized to maintain constant air temperature values of 25 °C using two wall mounted grilles and two exhausts. The air change per hour (ACH) used varies from 6 to 12 in order to evaluate its influence on the dispersion of exhaled contaminants. An external heat gain is simulated by a radiant wall (RW) that is active or inactive during the experiments. When RW is active the external heat gain simulated is 39.7 W/m2, which corresponds to a solar external radiation typical in many countries worldwide. The contaminant concentration is measured at different locations around HW and in the inhalation tube. The temperature gradient in the room is also measured along a vertical pole. The discussion of the results of the 16 experimental cases can be found in Ref. [1].