Sodbilig Batjargal

Journal Entry For

Module 6 - Evaluate Your Alternatives

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https://acc.autodesk.com/docs/files/projects/8c5c6f0e-77ad-475c-b808-18ff440afe0a?folderUrn=urn%3Aadsk.wipprod%3Afs.folder%3Aco.GMHNtzWLT0eYC5TvheUqkw&viewModel=detail&moduleId=folders

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Sodo Batjargal

I chose 2 metrics as Construction Total Cost and Envelope to Floor Area Ratio (EFAR).

Envelope-to-Floor Area Ratio (EFAR) is a key metric used to assess the efficiency of a building's design. It compares the surface area of a building's envelope (exterior walls, roof, and floor) to its total floor area. This ratio provides insight into the energy efficiency, construction costs, and overall performance of a building. EFAR is crucial for evaluating the energy performance of a building. Lower EFAR typically correlates with reduced energy consumption for heating and cooling. EFAR is calculated using the following formula: EFAR=Envelope Surface Area/Gross Floor Area

Metric 1: Custom node for Construction cost

Metric 2: Custom node for Envelope to Floor Area Ratio (EFAR)

Main Custom Node

Dynamo main nodes

An Image/screenshot of your summary table (created in Word, Excel, Google Sheets, or any data table tool) showing the input values tested and the values computed for each of the reported parameters

	Top Height	Top Radius	Gross Floor Area	Gross Surface Area	Cost of Construction	Envelop-to-Floor Area Ratio (EFAR)
1	300	15	389601	186774	227047703	0.479
2	300	30	397884	187799	232717758	0.472
3	300	45	406368	188857	238072861	0.465
4	300	60	414893	189978	243000953	0.458
5	300	75	422716	191089	247112906	0.452
6	300	90	428685	192038	249822277	0.448
7	350	15	454056	208369	271167203	0.459
8	350	30	464331	209808	278418262	0.452
9	350	45	474569	211226	285092102	0.445
10	350	60	484405	212624	290944677	0.439
11	350	75	493048	213909	295547012	0.434
12	350	90	499421	214918	298346639	0.430
13	400	15	518462	230162	317124485	0.444
14	400	30	530661	232000	326014340	0.437
15	400	45	542613	233765	334057348	0.431
16	400	60	553779	235432	340888553	0.425
17	400	75	563305	236891	346027256	0.421
18	400	90	570138	237968	348929700	0.417
19	450	15	582826	252093	364924165	0.433
20	450	30	596903	254320	375520891	0.426
21	450	45	610542	256421	384989934	0.420
22	450	60	623050	258352	392849779	0.415
23	450	75	633500	259984	398559797	0.410
24	450	90	640836	261136	401569373	0.407
25	500	15	647156	274126	414570900	0.424
26	500	30	663078	276732	426949081	0.417
27	500	45	678386	279161	437904744	0.412
28	500	60	692244	281350	446840727	0.406
29	500	75	703645	283157	453150279	0.402
30	500	90	711514	284387	456265659	0.400
31	550	15	711458	296235	466068553	0.416
32	550	30	729201	299211	480307036	0.410
33	550	45	746166	301961	492812209	0.405
34	550	60	761379	304407	502870271	0.400
35	550	75	773751	306389	509803309	0.396
36	550	90	782175	307701	513019282	0.393
37	600	15	775739	318402	519420157	0.410
38	600	30	795285	321742	535600673	0.405
39	600	45	813895	324809	549719755	0.399
40	600	60	830467	327508	560944841	0.394
41	600	75	843825	329665	568522511	0.391
42	600	90	852823	331062	571831141	0.388
43	650	15	840001	340615	574628055	0.405
44	650	30	861336	344313	592834347	0.400
45	650	45	881585	347693	608632775	0.394
46	650	60	899518	350643	621069177	0.390
47	650	75	913873	352976	629310712	0.386
48	650	90	923458	354460	632702111	0.384
49	700	15	904249	362865	631694053	0.401
50	700	30	927362	366916	652011315	0.396
51	700	45	949243	370605	669555262	0.390
52	700	60	968540	373805	683246825	0.386
53	700	75	983901	376314	692170120	0.382
54	700	90	994084	377888	695632970	0.380
55	750	15	968485	385145	690619554	0.398
56	750	30	993367	389546	713134043	0.392
57	750	45	1016876	393541	732490221	0.387
58	750	60	1037538	396989	747480485	0.383
59	750	75	1053911	399676	757102467	0.379
60	750	90	1064700	401339	760624385	0.377

Key Observations:

Building Height and EFAR:

As the building height increases, the EFAR generally decreases.
Example:

A 300-meter tall building has EFAR values ranging from 0.479 to 0.448.
A 750-meter tall building has EFAR values ranging from 0.398 to 0.377.

Conclusion: Taller buildings tend to have a lower EFAR, meaning they are more energy-efficient. This is because they have more floor area relative to their external surface area.

Top Radius and EFAR:

For a given building height, increasing the top radius generally decreases the EFAR.
Example:

At 300 meters height, EFAR decreases from 0.479 (15 meters top radius) to 0.448 (90 meters top radius).
At 750 meters height, EFAR decreases from 0.398 (15 meters top radius) to 0.377 (90 meters top radius).

Conclusion: Increasing the top radius reduces the EFAR, indicating a more efficient design. This is likely because a wider top radius reduces the relative amount of surface area compared to the floor area.

Implications for Energy Efficiency:

Lower EFAR Values: Buildings with lower EFAR values are more energy-efficient. They have less surface area per unit of floor area, which reduces the amount of heat that can escape in winter or enter in summer.
Example: The most efficient building in terms of EFAR is a 750-meter tall building with a 90-meter top radius (EFAR = 0.377).

Other useful metrics for evaluating building designs may as follows:

Daylight Factor: Measures the natural light availability inside the building.

Energy Use Intensity (EUI): Quantifies energy consumption per unit area (kWh/m²/year).

Thermal Comfort Index: Assesses occupant comfort based on temperature and humidity.

Sodbilig Batjargal - Module 6