Categories
HVAC & R Research

Modeling and performance simulation of a gas cooler for a C[O.sub.2] heat pump system

Modeling and performance simulation of a gas cooler for a C[O.sub.2] heat pump system Young-Soo Chang The outlet temperature of a gas cooler has a great effect on the efficiency of carbon dioxide heat pump systems. In order to obtain a small approach temperature difference at the gas cooler, a near-counterflow type heat exchanger has […]

Categories
HVAC & R Research

Optimal sensor placement for airborne contaminant detection in an aircraft cabin

Optimal sensor placement for airborne contaminant detection in an aircraft cabin Tengfei Zhang INTRODUCTION Currently only air temperature and barometric pressure are routinely measured in commercial aircraft cabins. These limited measurements are not sufficient when the environmental control system is not properly working, and they are not intended to be used to detect or monitor […]

Categories
HVAC & R Research

The acceptable air velocity range for local air movement in the tropics

The acceptable air velocity range for local air movement in the tropics N. Gong The perception of locally applied airflow was studied with tropical subjects who had become passively acclimatized to hot conditions in the course of their day-to-day life. During the experiments, 24 subjects (male and female) performed normal office work in a room […]

Categories
HVAC & R Research

The effects of moderately raised classroom temperatures and classroom ventilation rate on the performance of schoolwork by children

The effects of moderately raised classroom temperatures and classroom ventilation rate on the performance of schoolwork by children Pawel Wargocki Two independent field intervention experiments were carried out in school classrooms in late summer (in 2004 and 2005). The air temperature was manipulated by either operating or idling split cooling units installed for the purpose. […]

Categories
HVAC & R Research

Supervisory and optimal control of building HVAC systems: a review

Supervisory and optimal control of building HVAC systems: a review Shengwei Wang INTRODUCTION The building automation system (BAS) is a tool that can be used for more effective and efficient management of building services systems (Carlson and Di Giandomenico 1991). One of the main achievable goals of effective use of BASs is to improve the […]