ScholarBank@NUShttps://scholarbank.nus.edu.sgThe DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Sat, 18 Sep 2021 08:42:20 GMT2021-09-18T08:42:20Z5051- A generalized methodology for determining the total heat gain through building envelopeshttps://scholarbank.nus.edu.sg/handle/10635/54206Title: A generalized methodology for determining the total heat gain through building envelopes
Authors: Chou, S.K.; Chang, W.L.
Abstract: We present a generalized methodology for determining the annual total heat gain through external wails and roofs of large air-conditioned buildings. The methodology is based on the concept of the overall thermal transfer value (OTTV). Respective OTTV equations for building envelopes and roofs are developed through parametric simulations using the DOE-2 computer code. The equations are valid for buildings having different aspect ratios and wall masses. Appropriate coefficients for heat conduction through fenestrations and opaque walls and solar correction factors for wail facades of different orientations are computed from local weather data. The equations allow building designers to make accurate estimates of the total heat gain for the purpose of evaluating energy-efficient building envelope components and air-conditioning systems and plant options. The methodology is validated using DOE-2 computed heat gam results and can be applied to different classes of buildings, construction types and locations.
Mon, 01 Jan 1996 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/542061996-01-01T00:00:00Z
- Development of an energy-estimating equation for large commercial buildingshttps://scholarbank.nus.edu.sg/handle/10635/58099Title: Development of an energy-estimating equation for large commercial buildings
Authors: Chou, S.K.; Chang, W.L.
Abstract: We present the methodology used in developing an equation for estimating the cooling energy consumption of large commercial buildings. The equation was developed from a database of results generated from computer simulations using the DOE-2 program. Factors accounted for by the equation include: part-load performance of equipment, the number of cooling-degree days, diversity of building operation, and the overall thermal transfer value of the building envelope. Also, the equation has been generalized to take into account the oversizing of the chiller from 110% to 160% of the design capacity. Parametric analyses using single- and multiple-parameter variations validated the accuracy of the equation.
Mon, 01 Nov 1993 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/580991993-11-01T00:00:00Z
- Large building cooling load and energy use estimationhttps://scholarbank.nus.edu.sg/handle/10635/58426Title: Large building cooling load and energy use estimation
Authors: Chou, S.K.; Chang, W.L.
Abstract: We present a methodology for developing a set of cooling load and energy estimating equations for large commercial buildings. The methodology is developed from parametric simulations on the DOE-2 computer code for any given generic building type and annual weather data file of the location. The equations estimate the annual cooling energy use of a building, its peak cooling load and the sensible cooling load. Correlations are obtained using the concept of the overall thermal transfer value of building envelopes and the number of cooling degree-days in a year. Other key variables include space internal loads, design outdoor-indoor temperature difference, and the global efficiency of chiller plants. The set of simple equations are validated using results obtained from DOE-2 simulations of audited actual buildings. © 1997 by John Wiley & Sons, Ltd.
Wed, 01 Jan 1997 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/584261997-01-01T00:00:00Z
- Efficient energy performance of large commercial buildings in tropical climateshttps://scholarbank.nus.edu.sg/handle/10635/58244Title: Efficient energy performance of large commercial buildings in tropical climates
Authors: Chou, S.K.; Wong, Y.W.; Chang, W.L.; Yap, C.
Abstract: In this paper, we present the approach to develop energy targets for large commercial buildings in Singapore. The approach involves energy surveys and audits conducted on selected buildings and an analysis of their energy indices. We incorporate the use of computer simulations in order to assess the benefits of several energy conservation opportunities. The results of this study show that, for large commercial buildings, a three-tier classification is needed to account for the differing operating performances. Finally, we recommend the application of two sets of energy targets to achieve near- and long-term energy efficiency. © 1994.
Thu, 01 Sep 1994 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/582441994-09-01T00:00:00Z
- Effects of multi-parameter changes on energy use of large buildingshttps://scholarbank.nus.edu.sg/handle/10635/58230Title: Effects of multi-parameter changes on energy use of large buildings
Authors: Chou, S.K.; Chang, W.L.; Wong, Y.W.
Abstract: We describe the development of a methodology for predicting the effects of multi-parameter changes on the energy use of large buildings. The methodology is based on the third-order Taylor series expansion whose coefficients are evaluated for several key building parameters. The building was coded for energy performance simulation by the DOE-2 computer program. A database of simulation results was created from which the coefficients of the Taylor series expansion were derived. Test results using this energy predicting methodology provided reasonably accurate estimates of the total and cooling energy of a generic building in Singapore.
Wed, 01 Dec 1993 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/582301993-12-01T00:00:00Z