Calculation Of The Energy Contribution To A Sunspace

1633 words - 7 pages

EXERCISE 4: CALCULATION OF THE ENERGY CONTRIBUTION OF A SUNSPACE TO THE WINTER THERMAL LOAD OF A BUILDING LOCATED IN TURIN

Based on the results of the preceding exercises, foresee the placement of sunspaces on one or more of the facades of your reference building model.
Then proceed as follows for each sunspace type (characterizing all sunspaces with the same dimensions and thermo physical characteristics):
a. determine the net sunspace envelop transparent area for each surface orientation;
b. determine the transparent and opaque area of the walls/windows dividing the sunspace from the indoor space;
c. determine the monthly average daily global solar irradiation for each ...view middle of the document...

65
ms = as m but referred to the sunspace glazed envelop; default value = 0.85
s = as  but referred to the sunspace glazed envelop; default value = 0.75
Ei = daily solar radiation on the glazed element, dependent on location and orientation (see table on Turin data) [kWh/m2day]
Sf = average monthly shading coefficient of the glazed element (from the shadowing masks of the glazed element with shading device); default value for movable devices = 0.6

Sheet 2 (fsmw) – Title: Solar gain through massive walls between sunspace and its adjacent indoor room
Input parameters: Name of element
Orientation (S, SE-SW, E, W)
Area [m2]
U = thermal loss transmittance of the wall; default value = 2.2 (0.3 m-thick concrete wall with a heat phase-displacement of 8 hours)
 = short-wave solar absorption coefficient of the wall (ratio of the solar energy absorbed by the wall to the short-wave solar incident radiation, value between 0 and 1); default value = 0.9
ms = transparency coefficient of the sunspace glazed envelop; default value = 0.85
s = solar transmission coefficient of the sunspace glazed envelop; default value = 0.75
E = daily solar radiation on the wall, dependent on location and orientation (see table on Turin data) [kWh/m2day]
Sf = average monthly shading coefficient of the sunspace glazed envelop (from the shadowing masks of the glazed elements with shading device); default value for movable devices = 0.9

Sheet 3 (Es) – Title: Solar energy entering the sunspace through glazed elements
Input parameters: Name of element
Orientation (S, SE-SW, E, W)
Area [m2]
ms = transparency coefficient of the sunspace glazed envelope’s element; default value = 0.85
s = solar transmission coefficient of the sunspace glazed envelope’s element; default value = 0.75
E = daily solar radiation on the sunspace glazed envelope’s element, dependent on location and orientation (see table on Turin data) [kWh/m2day]
Sf = average monthly shading coefficient of the sunspace glazed envelope’s element (from the shadowing masks of the glazed elements with shading device); default value for movable devices = 0.9

Sheet 4 (Fs) – Title: Solar gain due to trapped energy
a1 = thermal loss coefficient by reflection
a2 = thermal loss coefficient through the floor
The coefficients are taken from the table on the side, based on the type of sunspace (columns 1 and 2) and the type of glazing: column 3, if the sunspace has a non-insulated floor and single glazing;
column 4, if the sunspace has a non-insulated floor and double glazing;
column 5, if the sunspace has an insulated floor and single glazing with light colour;
column 6, if the sunspace has an insulated floor and double glazing with light colour;
column 7, if the sunspace has an insulated floor and single glazing with dark colour;
column 8, if the sunspace has an insulated floor and double glazing with dark colour.

Sheet 5 (Lbm-Lhm ) – Title: Thermal losses through the...

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