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This paper aims at developing an analytical model for the coupled heat and mass transfer processes in a counterflow Reversibly Used Cooling Tower (RUCT) based on operating conditions, which is more realistic than most conventionally adopted Merkel approximations. Temperature and moisture content differences are chosen as the driving forces of heat and mass transfer correspondingly and a system of...
In this paper, the oil return model of vertical U-tube ground heat exchanger in the direct expansion ground-source heat pumps was presented based on fluid mechanics principle. And the minimum refrigerant velocity was calculated according to nil oil volumetric flow rate and the relation between refrigerant velocity and interface velocity. The design of diameter and length for U-tube ground heat exchanger...
A desuperheater heat recovery system that includes a reversibly used cooling tower (RUCT) was studied by simulation and field tests in subtropical regions in China. This paper presents the field test of a RUCT heating system using heat pump (RUCTHPS) in winter installed in a test office building, which is located in Changsha, Hunan province, a hot summer and cold winter region in China. Instead of...
The concept of potential for natural ventilation (NVP) is defined as the possibility, or probability, to ensure both indoor air quality and thermal comfort by natural ventilation. NVP value can provide the designers significant information to properly design and arrange natural ventilation strategy at the preliminary or conceptual stage of ventilation and building design. In 2005, Lina Yang presented...
Because of its high-capacity, low losses and no electromagnetic interference, the gas-insulated transmission line (GIL), which is a replacement of an overhead line in special environments, has been used for over 40 years, mainly as bus ducts of gas-insulated substations or underground connections in power plants. The insulated and cooling gas in GIL is mainly SF6 or its mixtures, which have high global...
SF6 gas has been widely used currently in electric power systems, such as GIS, GIL and GIT. However, because of the high global warming potential (GWP), SF6 was listed as one of the six restricted gases in "Kyoto Protocol" in 1997. Some fluorocarbon gases with low environmental effect and high dielectric performance are studied as the substitution candidates for SF6. This paper presents...
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