Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
The Ullevål building Presentation of the building Specific design issue Building concept Monitoring setup The winter monitoring The summer monitoring Monitoring results Major findings More information... Back to “Select a building” NatVent Ullevål hospital Administration Building Building presentation (1...) The Ullevål building Presentation of the building Specific design issue Building concept The administration building of Ullevål hospital was completed in 1924. The building has 4area storeys. There are about 160 employees in the 3500 m² floor building, occupied mainly office type work in the 120 cellular offices. 160 employees The building is situated in the centre of Oslo, with a busy road just in front of the building and a garden at the rear side. Monitoring setup The winter monitoring 3500 m ² floor area The summer monitoring 160 employees Monitoring results Major findings More information... Back to “Select a building” NatVent Building presentation (2|) The Ullevål building Presentation of the building Specific design issue Building concept Monitoring setup The winter monitoring The summer monitoring Monitoring results Major findings More information... Back to “Select a building” NatVent Building characteristics: All main building are of masonry or concrete constructions The building has a high thermal mass: exposed ceilings, heavy internal walls…. No heat insulation (old building) Coupled windows (two panes of single glazing), which are old and leaky Manually controlled awnings and Venetian blinds for sun protection Generally large rooms, with room height of 3,3 m Specific design issue The Ullevål building Presentation of the building Specific design issue The building design is typical for its period (1920 to 30): Ventilation system - The building has a passive stack ventilation system, with vertical shafts from each office. Ventilation control - The occupants can not really control the ventilation. The ventilation openings of the passive stack system are not adjustable. (The occupants can only control the openable windows). Heating system - The heating system is based on hot water circulating in radiators below the windows Heating control - The occupants control the temperature individually by adjusting valves on the radiators. Building concept Monitoring setup The winter monitoring The summer monitoring Monitoring results Major findings More information... Back to “Select a building” NatVent The building concept (1...) Passive stack ventilation The Ullevål building Presentation of the building Chimney Chimney Specific design issue Building concept Main duct Attic Attic Main duct Monitoring setup The winter monitoring The summer monitoring Offices Offices Monitoring results Major findings Offices Stack ducts More information... Back to “Select a building” NatVent Offices Offices Air flow Air extract grilles are located high on back wall in each office The grilles are connected to vertical extract shafts in the walls The building concept (2|) Passive stack ventilation The Ullevål building Presentation of the building Specific design issue Building concept Monitoring setup The winter monitoring The summer monitoring Air supply Remark: The air supplies have low noise attenuation Monitoring results Major findings More information... Back to “Select a building” NatVent Monitoring set-up The Ullevål building Presentation of the building Specific design issue Building concept Monitoring setup The indoor climate was monitored several offices in 1st and 3rd floor in a winter period (12 to 21 February) and a summer period (28.8 to 5.9.1997). W = winter monitoring S = summer monitoring The winter monitoring The summer monitoring Monitoring results W3 S1 S2 W1 W2 Major findings More information... S3 S4 Back to “Select a building” NatVent W4 Winter monitoring (1...) measurements in office W2 (South) 40 Presentation of the building 35 Building concept Monitoring setup The winter monitoring The summer monitoring Monitoring results Major findings More information... Temperature (°C) / flow rate (l/s.m²), Specific design issue 1100 30 1000 25 900 Tint. 20 800 15 700 10 600 0 12/2 -5 CO2 concentration Weekend: no occupation 5 500 400 13/2 14/2 15/2 16/2 17/2 18/2 19/2 20/2 300 -10 200 Text. -15 Back to “Select a building” 1200 The indoor temperature is mostly acceptable. It is sometimes too high (>25°C). This due to the control system of the radiator: ordinary valves instead of thermostatic valves. -20 NatVent 100 The Indoor Air Quality is acceptable: the CO2 -concentrations are never higher than the limit of 1200 ppm. 0 CO2 -concentration (ppm) The Ullevål building Winter monitoring (2|) conclusions The Ullevål building Presentation of the building Specific design issue Building concept Monitoring setup The winter monitoring The summer monitoring Monitoring results Major findings More information... Back to “Select a building” NatVent At first sight the ventilation rates seem to be adequate: the IAQ is acceptable. However, People complain about drauhgts. This problem is due to the poor performance of the inlet openings. Moreover, neither the inlet openings in the exterior walls, nor the extraction openings to the chimneys can be adjusted. Hence the ventilation is continuous. This causes unnecessary ventilation and ventilation losses when the offices are unoccupied. The energy use in the building is quite high (170 to 220 kWh/m² for room heating). This could be reduced by: Placing a new temperature control system with thermostats Placing new air thight windows Placing radiators with modern heating elements Placing controllable ventilation inlet openings (to reduce ventilation losses). Summer monitoring (1...) measurements in office S3 (North) 30 1400 Presentation of the building Tint. Specific design issue Monitoring setup The winter monitoring The summer monitoring Monitoring results Temp. (°C) / Flow rate (l/s.m²), Building concept 1200 25 Major findings 1000 20 Text. 800 15 600 10 Weekend: no occupation CO2 concentration 400 Flow rate 5 200 More information... 0 Back to “Select a building” NatVent 28/8 0 29/8 30/8 31/8 1/9 2/9 2/9 3/9 The indoor temperature is quite high (27°C): the room faces North and the maximum outdoor temperature is only 25°C CO2 (ppm) The Ullevål building Summer monitoring (2...) conclusions The Ullevål building Presentation of the building Specific design issue Thermal comfort: The internal temperatures are too high. The offices on the South side of the building have particular overheating problems. Building concept Monitoring setup Ventilation: The winter monitoring The summer monitoring Monitoring results Major findings More information... Back to “Select a building” NatVent The ventilation rate (4ACH) is much lower than in winter time. This is normal: the driving force, the temperature difference between outside and inside, is much lower. Hence the IAQ is lower than in winter time: the CO2 -concentration often exceeds the limit of 1200 ppm. People complain about the IAQ in summertime. Moreover the air changes are certainly far too low to cool down the thermal mass of the building. Summer monitoring (3|) reduction of heat load The Ullevål building Presentation of the building Specific design issue In order to reduce heat loads in summer and keep temperatures down a number of improvements could be made: Installation of new windows with automatic solar control Building concept Installation of new, energy efficient lighting equipment (i.g. HF neon tubes), possibly with automatic control for daylight compensation. Reducing the internal gains has a positive effect on the summer comfort. Increasing the ventilation. The thermal mass of the building can be cooled down by means of intensive ventilation. As the stack effect in summertime is too low, intensive ventilation could be introduced by installing an assisting extract fan. This fan could be switched on whenever Tint goes above a critical limit and Tint > Text. Monitoring setup The winter monitoring The summer monitoring Monitoring results Major findings More information... Back to “Select a building” NatVent Monitoring results The Ullevål building Presentation of the building The main conclusions from the monitoring programme are: Specific design issue Building concept Monitoring setup The winter monitoring The summer monitoring Monitoring results The air flow rates are acceptable in winter: the IAQ is acceptable. However they can’t be decreased outside the office hours. The air flow rates in the summer are too low: the IAQ is no longer acceptable and the air flow rate are too low to cool down the building. The offices have problems with overheating in summer Air inlet grilles can cause draught and noise problems The current ventilation system has shortcomings. Possible improvements: Major findings More information... Back to “Select a building” NatVent Install new grilles in the façades with filter and sound attenuation Install an assisting, central extract fan with ductwork in existing ducts to realise intensive ventilation during the summer Install new automatically controlled solar shading devices. Major findings The Ullevål building Presentation of the building This building is one of very few large office buildings in Norway that is still is equipped with a traditional, Scandinavian, passive stack ventilation system. As such, the building is of interest to NATVENT. Unfortunately, the building has technical shortcomings concerning inlet grilles, windows, heating system and general furnishing. The building in its present state is not ideal, this has been confirmed by the measurements and the questionnaire data. However, it is of interest to see that the stack ventilation system can ensure a sufficient air flow rate during the heating season. Further, significant improvements to the ventilation of the building could be achieved simply by placing new advanced inlet grilles and an assisting extract fan system. Specific design issue Building concept Monitoring setup The winter monitoring The summer monitoring Monitoring results Major findings More information... Back to “Select a building” NatVent More information... The Ullevål building Presentation of the building Specific design issue Building concept Monitoring setup The winter monitoring The summer monitoring Monitoring results Find more information on the PROBE building in the following documents: \Reports \Monitoring Reports \Summary Reports\no1summ.pdf global presentation of the buildings (4p./building) contents: building description - ventilation strategy and technology winter and summer monitoring results - conclusions \Reports \Monitoring Reports \Detailed Reports\no1det.pdf detailed reports of all 19 monitoring campaigns (20p./campaign) contents: monitoring set up - analysis of results - conclusions Major findings More information... Back to “Select a building” NatVent You can read and print pdf-files with the Acrobat® Reader ®3.0. Program. This program is free. Download it from the Acrobat web site: www.adobe.com OR run the installation file ar32e301(1).exe in the directory \Installation