In this paper,a numerical study is carried out to investigate the performance of a coupled BIPV/T-AHU system in Sudan.A mathematical model was utilzed,Matab Simulink was used to do simul ation.Results showed good agre...In this paper,a numerical study is carried out to investigate the performance of a coupled BIPV/T-AHU system in Sudan.A mathematical model was utilzed,Matab Simulink was used to do simul ation.Results showed good agreement with experimental data from the literature.The problem studied in this paper is reducing the energy required for heating in winter(preheating BIPV/T)and avoiding the high photovoltaic cell temperature in summer.We compare the energy consumption with and without BIPV/T-AHU in different cities in Sudan.The results showed that utilizing the exhaust air to cool the photovoltaic cell could reduce the PV/T cell temperature in the range(9-12)℃,which can increase the eletrical power output in a range of(12-21.44)W/m^(2).In winter,utilization of the preheating BIPV/T system can decrease the heating load in Wadi Halfa in the range of(6-107.1%).Damazein does not need a high heating power in the daytime for the ait conditioning system depending on the local climate,so the heat energy produced by the system can be used for drying,desiccant cooling,or heating water,with increasing the eletrice power produced by cooling PV/T cells.The results indicated a great posibility to use the BIPV 1 T system under the studied conditions,in addition,this study provides important information for the application of the BIPV/T system in these areas.展开更多
Different solutions of renovating the ventilation in apartment buildings have been researched. The analysis shows that the use of heat recovery in cold climate regions is essential. Central as well as apartment- and r...Different solutions of renovating the ventilation in apartment buildings have been researched. The analysis shows that the use of heat recovery in cold climate regions is essential. Central as well as apartment- and room-based solutions with heat recovery have been studied. Balanced ventilation is suitable for small (2 - 3-storey) apartment buildings with a suitable room solution for apartments. In larger apartment buildings, the system with the exhaust air heat pump could be used. This is particularly suitable for apartment buildings with mechanical exhaust ventilation. In small apartments, it is most suitable to use room-based air handling units (AHUs) with the recuperative heat exchanger, plus exhaust ventilators in the WC, bathroom and kitchen. The economic indicators of this system are best for two-room apartments. Apartment-based AHUs are suitable for large apartments if there is no opposition from the residents, which is caused by ventilation tubes (ducts) in the apartment. The comparison of the reduced energy cost in case of different AHUs has been presented for small apartment buildings.展开更多
The paper presents the results of the investigations into the indoor climate and energy efficiency of ventilation devices in residential buildings and nursing homes. The indoor climate studies discussed in the article...The paper presents the results of the investigations into the indoor climate and energy efficiency of ventilation devices in residential buildings and nursing homes. The indoor climate studies discussed in the article were conducted in a nursing home where room ventilation is based on Meltem Air Handling Units (AHU). Similar studies have been carried out in apartment buildings where CO2 levels in bedrooms were compared before and after renovating the ventilation with Meltem AHU and installing exhaust fans in the bathroom/WC and kitchen. Tenants evaluate the use of Meltem AHU in apartments very positively. The article presents the efficiency results of Meltem AHU with different external air temperatures conducted in apartments in real-life situations. The study shows that skilful renovation of ventilation in old apartment buildings enables to achieve good indoor climate and energy saving at the same time.展开更多
基金This work was jointly supported by Research Fund of State Key Lab-oratory of Technologies in Space Cryogenic Propellants(SKLTSCP1601)Scientific Research Foundation of Graduate School of Southeast Uni-versity GS501100012595 NO.YBYP1903).
文摘In this paper,a numerical study is carried out to investigate the performance of a coupled BIPV/T-AHU system in Sudan.A mathematical model was utilzed,Matab Simulink was used to do simul ation.Results showed good agreement with experimental data from the literature.The problem studied in this paper is reducing the energy required for heating in winter(preheating BIPV/T)and avoiding the high photovoltaic cell temperature in summer.We compare the energy consumption with and without BIPV/T-AHU in different cities in Sudan.The results showed that utilizing the exhaust air to cool the photovoltaic cell could reduce the PV/T cell temperature in the range(9-12)℃,which can increase the eletrical power output in a range of(12-21.44)W/m^(2).In winter,utilization of the preheating BIPV/T system can decrease the heating load in Wadi Halfa in the range of(6-107.1%).Damazein does not need a high heating power in the daytime for the ait conditioning system depending on the local climate,so the heat energy produced by the system can be used for drying,desiccant cooling,or heating water,with increasing the eletrice power produced by cooling PV/T cells.The results indicated a great posibility to use the BIPV 1 T system under the studied conditions,in addition,this study provides important information for the application of the BIPV/T system in these areas.
文摘Different solutions of renovating the ventilation in apartment buildings have been researched. The analysis shows that the use of heat recovery in cold climate regions is essential. Central as well as apartment- and room-based solutions with heat recovery have been studied. Balanced ventilation is suitable for small (2 - 3-storey) apartment buildings with a suitable room solution for apartments. In larger apartment buildings, the system with the exhaust air heat pump could be used. This is particularly suitable for apartment buildings with mechanical exhaust ventilation. In small apartments, it is most suitable to use room-based air handling units (AHUs) with the recuperative heat exchanger, plus exhaust ventilators in the WC, bathroom and kitchen. The economic indicators of this system are best for two-room apartments. Apartment-based AHUs are suitable for large apartments if there is no opposition from the residents, which is caused by ventilation tubes (ducts) in the apartment. The comparison of the reduced energy cost in case of different AHUs has been presented for small apartment buildings.
文摘The paper presents the results of the investigations into the indoor climate and energy efficiency of ventilation devices in residential buildings and nursing homes. The indoor climate studies discussed in the article were conducted in a nursing home where room ventilation is based on Meltem Air Handling Units (AHU). Similar studies have been carried out in apartment buildings where CO2 levels in bedrooms were compared before and after renovating the ventilation with Meltem AHU and installing exhaust fans in the bathroom/WC and kitchen. Tenants evaluate the use of Meltem AHU in apartments very positively. The article presents the efficiency results of Meltem AHU with different external air temperatures conducted in apartments in real-life situations. The study shows that skilful renovation of ventilation in old apartment buildings enables to achieve good indoor climate and energy saving at the same time.
