Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
While not measured, the Building America House Simulation Protocols gives a data point:
Solar gains through windows shall be modified by a constant interior shading multiplier of 0.7, meaning that all solar gains are reduced by 30% through use of blinds, shades, or curtains.
I'm not sure the source of that number—it predates my involvement. There's also assumptions about opening up windows for natural ventilation cooling:
In situations where it is a Monday, Wednesday, or Friday and there is a cooling load, windows will be opened if the cooling capacity of OA flow can maintain the cooling set point, the outdoor humidity ratio is less than 0.0115, and the outdoor relative humidity is less than 70%. The natural ventilation rate shall be calculated using the Sherman-Grimsrud model (Sherman and Grimsrud 1980). Twenty percent of the maximum openable area for windows on each façade and on each floor shall be open. Windows are assumed to be closed once the indoor temperature below the temperature specified in Table 46, or if the air change rate exceeds 20 air changes per hour.
I'd be interested in hearing if there is an measured data on these topics.
| | 2 | No.2 Revision |
While not measured, the Building America House Simulation Protocols gives a data point:
Solar gains through windows shall be modified by a constant interior shading multiplier of 0.7, meaning that all solar gains are reduced by 30% through use of blinds, shades, or curtains.
I'm not sure the source of that number—it predates my involvement. There's also assumptions about opening up windows for natural ventilation cooling:
In situations where it is a Monday, Wednesday, or Friday and there is a cooling load, windows will be opened if the cooling capacity of OA flow can maintain the cooling set point, the outdoor humidity ratio is less than 0.0115, and the outdoor relative humidity is less than 70%. The natural ventilation rate shall be calculated using the Sherman-Grimsrud model (Sherman and Grimsrud 1980). Twenty percent of the maximum openable area for windows on each façade and on each floor shall be open. Windows are assumed to be closed once the indoor temperature below the temperature specified in Table 46, or if the air change rate exceeds 20 air changes per hour.
I'd be interested in hearing if there is an any measured data on these topics.
