2017 ASHRAE Annual Conference

In building design or research processes, building energy simulations are conducted using weather data. There are two types of the weather data for building energy simulations; one is the typical weather year (TWY) to estimate annual cooling/heating load and the other is the design weather data (DWD) to estimate maximum cooling/heating load. In this paper, we propose a new type of year weather data which can be used as both the reference weather year and design weather data, here called as the typical and design weather year (TDWY). The TDWY presented in this paper include each quantile values of multi-year observation data, which means that the TDWY is also used for the versatile design weather data. In this paper, we investigate more detailed property of the TDWY such as the simultaneity of each weather components.

Building dynamic simulation is a mature and advanced technique that has been used for decades to evaluate the thermal performance of building designs and existing buildings. Alternately, some researchers have developed reduced models that represent the thermodynamics of buildings using simple models based in real data. Lumped Parameter Models (LPMs), are lineal dynamic models that can be studied with the techniques developed in systems theory. This work identifies the LPMs that best represent 40 dwellings in the UK, and has applied system theory to study the response of those buildings in frequency to the driving forces of outside temperature, electricity and solar gains. The work has shown that the buildings present a response in frequency similar to low-pass filters with respect to outside temperature.

Temperatures in the Gulf Arab region exceed 50 Celsius during the summer, making cooling one of the biggest issues facing the region. This paper investigates the effect of wind speed, direction and temperature on the air-conditioning system thermal performance in an outdoor shopping and setting area. Moreover, two methods of conditioned air supplying will be tested using displacement diffusers and jet diffusers. The effect of different roof designs will be simulated. Some wind mitigation methods were tested like trees and perforated panels. A three dimensional Computational Fluid Dynamics (CFD) model was built to simulate the air flow and temperature patterns between the buildings. Mass and energy conservation equations were added to the model. K-Turbulence model was in the calculations. In order to validate the numerical model, wind-tunnel tests were carried out and compared with the air-flow patterns from simulations. Comparison between air flow simulations and wind-tunnel results yielded good agreement.