English

This paper contains a numerical study of the indoor temperature, humidity, and comfort and indoor air quality conditions in a bedroom located in Saint Hubert, Belgium. The performance of the bedroom is presented for a range of constant outdoor ventilation rates (0.1 ach to 1 ach) with and

The humidity of rooms and the moisture conditions of materials in the enclosure of buildings depend much on each other because of the moisture exchange that takes place over the interior surfaces. These moisture influences also depend strongly on the thermal conditions of indoor spaces and enclosure elements of buildings. In turn, the moisture and humidity conditions have significant impact on how buildings are operated.

The Delta-Q duct leakage test has been developed over the past several years as an improvement to existing duct pressurization tests. It focuses on measuring the air leakage flows to outside at operating conditions that are required for energy loss calculations for duct systems, and infiltration impacts. The Delta-Q test builds on the standard envelope tightness measurement technique of a blower door by repeating the tests with the system air handler off and on. This study uses detailed

Duct leakage in forced-air distribution systems has been recognized for years as a major source of energy losses in residential buildings. Unfortunately, the distribution of leakage across homes is far from uniform, and measuring duct leakage under normal operating conditions has proven to be difficult.

This paper reports the results of fluid flow measurements carried out at the exit of sidewall registers. Time-averaged mean velocity and turbulence (local root mean square velocity fluctuation) profiles were measured at the exit plane of two commonly used 8 in. 4 in. (203 mm 102 mm) sidewall registers.

For reliable operation of computer equipment in a data center, adequate cooling air must be supplied to the equipment. The distribution of cooling air through the perforated tiles in a raised-floor data center is governed by the fluid mechanics of the underfloor space. The pressure variation in that space is shown to be the cause of nonuniform distribution of airflow. The various factors that influence the distribution are discussed. The effect of floor height and tile open area is illustrated

This paper provides an overview of the benefits of plenum fans and a detailed discussion of some of the pitfalls. After covering some of the benefits leading to extensive use of plenum fans, included is a brief discussion of the major complaint expressed about plenum fans, which is that plenum
fans are less efficient than housed fans. Finally, the bulk of the paper covers problems that can result from poor design practices, sloppy construction, and careless handling.

New equations derived from the recent ASHRAE-sponsored research project RP-1026 will enable HVAC system designers to better predict aero-acoustic performance of sheet metal plenums. This paper deals primarily with the aerodynamic performance of flow-through plenums and presents new
total pressure drop equations for some of the most common plenum configurations. Comparisons are made between these equations, computational fluid dynamics (CFD) analyses, and hand-calculation methods. The practical uses of plenums are discussed along with prescriptive rules of thumb to help

This paper describes the evaluation and recalibration of the complaint prediction model developed by Federspiel (2000). We collected temperature time-series data and complaint data from six buildings ranging in size from 60,000 ft2 to 800,000 ft2 from three different geographical locations. Using these data, we found a low correlation between the observed number of complaint events and the Predicted Average Complaint Events (PACE) for the monitoring intervals and systematic underprediction of hot complaints.

This paper presents the results of four thermal comfort surveys conducted in naturally ventilated and air-conditioned buildings located in Bari, in southern Italy, during winter and summer seasons. The buildings were of different types, including offices, lecture rooms, and library reading rooms. The