Evaluating natural ventilation cooling potentials during early building designs

Natural ventilation (NV) is an efficient way of cooling buildings, and its energy saving potentials however depend on many parameters including local hourly weather and climate conditions, types of ventilations, indoor cooling loads (or heat gains), operating schedules, window types, and opening-wall ratios etc. Determination of the NV flow rate is thus challenging, although there are many empirical equations for different NV strategies, e.g. single-sided and cross-ventilation, considering different driving forces, e.g. wind, buoyancy and a mix of both.

Evaluation of some DCV control strategies based on building types

During the recent decades, energy consumption of buildings, together with the costs for operation, has gained increasing concern. HVAC systems stand for a significant share of the total energy consumption in buildings. Demand-controlled ventilation (DCV) has proved to be an efficient system that gives opportunity to strongly reduce energy consumption, especially when contamination loads or temperature load vary during the operating hours. 30-60% energy reduction can be expected by applying proper DCV.

EVALUATION ON DISTRIBUTED ENERGY SYSTEM AT KITAKYUSHU SCIENCE AND RESEARCH PARK DURING 2003

A distributed energy system in Kitakyushu Science and Research Park (KSRP) has been introduced since April 2001. In this paper, the system’s running situation was analyzed by using the recorded data in 2003. Generating electricity, heat recovery efficienc

STUDY ON EVALUATIONS OF THERMAL ENVIRONMENT UNDER CROSS VENTILATION AND AIRFLOWS FROM AIR-CONDITIONING SYSTEM AND ELECTRIC FAN

The purpose of this study was to clarify differences between evaluations of thermal environment undercross ventilation and airflows from air-conditioning systems and electric fans. Nine subjects evaluatedthermal sensation, thermal comfort sensation, airflow sensation and humidity sensation in anexperimental room in the summer of 2006. The surrounding ambient temperatures, relative humidity,and air velocity were measured simultaneously.

Evaluation of a distributed parameter model for counterflow heat exchangers.

The paper deals with simulation of the heat exchanger and model evaluation. There are presented partial differential equations of heat exchanger model, which assume liquid mediums. Presented, in the paper, model is used as an approximation for three different type heat exchangers. The purpose of these investigations was to explain weather the same model could match well to different of shape and type exchangers by adjusting some model parameters. There is shown a method of determining model parameters. Results of simulation are compared with measured data.