Dutch

Deals with a code providing directives for design and construction of cold stores, drafted by the Foundation for Development of Refrigeration Technique (Stiftung Ontwikkeling Koeltechniek). Gives threshold values for admissible pressure difference and admissible measure of non-tightness, and values forthe required pressure equalizing opening, depending on nature and size of the cold room.

Measures the pressure on the outlet of a flue on a free-standing scale model in the wind tunnel at IG-TNO, as a function of the height of the flue outlet above the roof, of its position on the sloping roof and the pitch of the roof.

One of a series of investigations of the improper functioning of ventilation and smoke stacks. The problem is essentially one of town planning in which the layout of low and high rise buildings can cause unknown influences at the outlet of vertical stacks on low rise buildings. The study concerns thepressure distribution on and above the roof of a low rise building upwind or downwind of a high rise building as a function of the separation between them for various heights of the high rise buildings.

Investigates what minimum fresh air supply per person is required to prevent unacceptable odour annoyance due to stale smells in offices and comparable buildings. The experiment is carried out in different buildings in rooms of varying size and occupancy density, with mechanical or natural ventilation. Determines the air supply to the room, the CO2 concentration, the number of lighted cigarettes, the odour concentration and the extent of odour annoyance to occupants.

Reports measurements on air transport through homes made by a committee working a Dutch Standard on Heating Load Calculation similar to DIN 4701, but taking account of air infiltration losses through joints and cracks between glazing, window-frame and facade construction. Describes the measuring method applied. Tables air leakage coefficients c and flow exponents, n ,of a number of flats and single family houses. Also tables c and n values of cracks according to type of construction and material, use of weather strips and measuring institute.

Reports experiments on whether there is an optimum air speed for comfort carried out at the Electricity Council Research Centre at Capenhurst. 9 seated subjects were separately exposed to a steady horizontal air movement over the whole body. At air velocities of 0.1, 0.15, 0.25 and 0.35 m/s the subjects were asked to adjust room air temperature personally to a preferred level. An enquiry list was laid before them. Preference was given to the 10-point Bedford list over the 7-point ASHRAE one. Compares test result figures with Bedford and Fanger theories. Uses the Newman Keuls procedure.

Air curtains are used to protect entrances of big buildings such as department stores and cold-storage warehouses. When designing an air curtain for a given situation, one needs to know the pressure difference between both sides of the curtain due to the temperature difference and forced ventilation, as well as the wind. In literature on air curtains the effect of wind is generally underestimated.

Elucidates many different aspects of formaldehyde occurrence, such as, comparable indoor air pollutants, complaints and investigations, coherence with ventilation rate and construction, chipboard types, qualities and prices, differing European directives on board composition, chipboard in cold and warm types of flat roofs.

Describes different goals of air leakage measurement with corresponding measuring methods. Discusses results and experience from measurements carried out with the stationary overpressure method and the non-stationary tracer gas method. Adds working diagrams. Pleads for further standardisation of thespecific equivalent leak opening (SELO) especially of temperature on which it is based. Gives numerical example for calculating the lower limit of admissible non-tightness of cold rooms.

Discusses flow of air between two rooms through an open door. Considers 6 cases with and without mechanical ventilation and with a temperature difference between the two rooms. Gives examples of the calculation of air flow. Recommends that for hospitals where the transfer of bacteria should be avoided, doors should be kept shut as much as possible and that it is not economically justifiable to choose such a high ventilation rate that no undesirable back flow occurs with the doors open.