In This paper, we offered a method of exergy-economic coefficient ? analyzed the distributedpower-supply system of gas turbine co-generation and calculated the exergy-economic coefficients ofthis system. The results indicated that the distributed power-supply system of gas turbinecogeneration had higher thermal economy?Further we analyzed the sensitivities and got theexergy-economic coefficient of this system under different natural gass prices?
As a new way of air conditioning, task air conditioning (TAC) system is often used in combine withbackground air conditioning (traditional central air conditioning) system. In this research, the ComputationalFluid Dynamics (CFD) technique is used to analyze the impact on thermal environment of task zone whenthese two air conditioning systems are used together. The purpose is to find the thermal satisfactory workingconditions of the task air conditioning when the temperature of the background air conditioning is set to behigh.
In the study of indoor and outdoor thermal environment, the analysis and calculation for radiation are adifficulty when the opaque and half-transparent objects exist together, especially for analyzing theindoor environment for atrium, building with large scale transparent envelope and some half-open areawith plants. The traditional method is hard to deal with the long-wave and short-wave radiation issueswhen several opaque and half-transparent objects exist together, and the accuracy description of thethermal environment becomes a problem.
The Korean Ministry of Construction and Transportation(MOCT) has imported the Intelligent BuildingCertification Program(IBCP) to grant certification by evaluating the standard of Intelligent buildings(IB).The purpose of this research is to introduce the IBCP of Korea and to analysis of energy reduction ratein buildings from the enforcement of certification system. At this time, the result of deriving items relatedto building energy among evaluation items of IBCP and performing comparative analysis by setting upthe standard building have been presented for the amount of energy reduction.
The performance of indoor airflow for the office room with the hybrid air-conditioning system has beeninvestigated by means of CFD analysis. The hybrid air-conditioning system is composed of under floorair supply outlets for task zone and the natural ventilation openings for ambient zone. The measureddata (Kotani et al. 2006) at the office room in existence was used as the boundary condition of the flowrate of each natural ventilation opening and task flow outlets for CFD.
Energy tariff is a major cost in hotel operation. Effective use of energy can reduce operationalexpenditures and has important environmental benefits. Solar heat gain particularly throughfenestration, contributes to a significant proportion of the building envelope cooling load. More solarradiation means more total solar heat gain and hence, more cooling requirements and larger electricityconsumption for air-conditioning in hot summer. Daylight makes an interior space look more lively andattractive and people expect good natural lighting in their living spaces.
In 2003, the International Commission on Illumination (CIE) adopted 15 standard skies that cover thewhole probable spectrum of usual skies found in the world. Each sky represents a unique distribution.Once the standard sky has been identified, the sky irradiance and outdoor illuminance at any surfacesof interest can be obtained for subsequent investigations and complicated expressions for inclinedsurface models are not required.
A questionnaire survey of urban Osaka apartment residents elicited data related to the use of airconditioners, portals, and electric fans as means of bearing summer heat. Those means respectiverelationships to respondents attributes, especially age, were investigated. Results show the following:1) regarding electricity expense awareness, younger respondents (under 40 years old) save electricitymore (p
This paper reviews the scenarios developed for the Intergovernmental Panel on Climate Change(IPCC) analysis. It pays particular attention to the applicability of these scenarios to the analysis ofenergy demand, energy savings, and reductions of CO2 emissions for the buildings sector.
For most sunny climates, the presence of high thermal loads due to the effect of solar radiationreinforces the need to protect the glazing in the facades and skylights. If this is not properly donethe performance of air-conditioning systems would be compromised and the lifespan of thatglazing would result severely affected. However, depending on the type and reflective nature ofthe shading system selected, undesirable effects for ventilation, comfort and especially forday-lighting tend to occur in the rooms provided with apertures that, paradoxically, we are trying toprotect.
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