{"id":2598,"date":"2023-06-27T09:10:07","date_gmt":"2023-06-27T09:10:07","guid":{"rendered":"https:\/\/fairconditioning.org\/fc-activity\/?post_type=activity&p=2598"},"modified":"2023-06-28T05:29:33","modified_gmt":"2023-06-28T05:29:33","slug":"determining-u-values-of-wall-and-roof","status":"publish","type":"activity","link":"https:\/\/fairconditioning.org\/fc-activity\/activity\/determining-u-values-of-wall-and-roof\/","title":{"rendered":"Determining U-values of Wall and Roof"},"content":{"rendered":"\n
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Objective:<\/h5>\n\n\n\n

To calculate the U-value ( w\/m\u00b2K) of different materials used in a different climatic zones<\/p>\n\n\n\n

U value:<\/strong> Thermal transmittance (U value) is the heat transmission in unit time through unit area of a material or construction and the boundary air films, induced by unit temperature difference between the environments on either side. Unit of U value is W\/m2 .K. U value for the wall\/roof\/glazing indicates its ability to transfer heat through conduction. <\/p>\n\n\n\n

Outcome:<\/h5>\n\n\n\n

S<\/em>tudents will learn about thermal properties of building materials used in India<\/p>\n\n\n\n

Requirements:<\/h5>\n\n\n\n

Energy Conservation Building Code (ECBC) documents, Suggestive research papers based on building materials and their thermal properties<\/p>\n\n\n\n

Prerequisites:<\/h5>\n\n\n\n

Students should have knowledge about materials used in Walls and Roofs in different climatic zone, both vernacular and contemporary materials <\/p>\n\n\n\n

Procedure:<\/h5>\n\n\n\n

Step 1: <\/em><\/strong>Create 5 groups out of the class and each group takes up one climatic zone. A brief introduction on the ECBC document be given before the groups start with the activity. <\/p>\n\n\n\n

Step 2:<\/em><\/strong>  Students should list down the building materials used and specification of different layers while assembling for roof, and wall through research for the identified climatic zone. For eg: <\/p>\n\n\n\n

Wall for Hot dry climates (Vernacular) – External lime plaster, Clay bricks, Internal Lime plaster;<\/p>\n\n\n\n

Wall for Hot dry climates (Contemporary) – External plaster, AAC blocks, Internal plaster, Ceramic tiles.<\/p>\n\n\n\n

Step 3: <\/em><\/strong>Each group should list down such layers and assemblies as shown in the example below used in particular climatic zone along with the thickness, in the table below. <\/p>\n\n\n\n

Step 4:  <\/em><\/strong>Students should calculate the U – value for roof, and wall to understand the heat transfer of different materials<\/p>\n\n\n\n

Table: Wall Assembly U-value Calculation<\/em><\/strong><\/p>\n\n\n\n

Sr. No<\/em><\/strong><\/td>Materials<\/em><\/strong><\/td>Thickness (m)<\/em><\/strong><\/td>Thermal Conductivity (k) (W\/m.K)<\/em><\/strong><\/td>Specific Heat capacity (kJ\/kg.K)<\/em><\/strong><\/td>U-value <\/em><\/strong>W\/m\u00b2.K<\/em><\/strong><\/td>ECBC U-Value Requirement for Wall Assembly W\/m\u00b2.K<\/em><\/strong><\/td>Climatic Zone – City\/State<\/em><\/strong><\/td><\/tr>
Assembly 1 (Vernacular) for Hotdry climate<\/em><\/td><\/tr>
1<\/em><\/td>Internal Lime Plaster <\/em><\/td>0.015<\/em><\/td><\/td><\/td><\/td>


<\/td>		<\/td><\/tr>
2<\/em><\/td>Clay Block<\/em><\/td>0.25<\/em><\/td><\/td><\/td><\/tr>
3<\/em><\/td>External Lime Plaster<\/em><\/td>0.015<\/em><\/td><\/td><\/td><\/tr>
Assembly 2 <\/em><\/td><\/tr>
<\/td><\/td><\/td><\/td><\/td><\/td><\/td><\/td><\/tr>
Assembly 3<\/em><\/td><\/tr>
<\/td><\/td><\/td><\/td><\/td><\/td><\/td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Table: Roof Assembly U-value Calculation<\/em><\/strong><\/p>\n\n\n\n

Sr. No<\/em><\/strong><\/td>Materials<\/em><\/strong><\/td>Thickness (m)<\/em><\/strong><\/td>Thermal Conductivity (k) (W\/m.K)<\/em><\/strong><\/td>Specific Heat capacity (kJ\/kg.K)<\/em><\/strong><\/td>U-value <\/em><\/strong>W\/m\u00b2.K<\/em><\/strong><\/td>ECBC U-Value Requirement for Wall Assembly W\/m\u00b2.K<\/em><\/strong><\/td>Climatic Zone – City\/State<\/em><\/strong><\/td><\/tr>
Assembly 1 (Vernacular) for Hotdry climate<\/em><\/td><\/tr>
1<\/em><\/td>Wooden frame<\/em><\/td>0.075<\/em><\/td><\/td><\/td><\/td>


<\/td>		<\/td><\/tr>
2<\/em><\/td>Thatch<\/em><\/td>0.25<\/em><\/td><\/td><\/td><\/tr>
Assembly 2 <\/em><\/td><\/tr>
<\/td><\/td><\/td><\/td><\/td><\/td><\/td><\/td><\/tr>
Assembly 3<\/em><\/td><\/tr>
<\/td><\/td><\/td><\/td><\/td><\/td><\/td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Step 5:  <\/em><\/strong>The lower the U value, better Thermal conductivity. Discuss and Reflect on the findings. <\/p>\n\n\n\n

References:<\/h5>\n\n\n\n

Bureau of Energy Efficiency – beeindia.gov.in – https:\/\/beeindia.gov.in\/sites\/default\/files\/Residential%20Code_Building%20Envelope_Draft_rev4.pdf<\/em><\/strong><\/a><\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Objective: To calculate the U-value ( w\/m\u00b2K) of different materials used in a different climatic zones U value: Thermal transmittance (U value) is the heat transmission in unit time through unit area of a material or construction and the boundary air films, induced by unit temperature difference between the environments on either side. Unit of […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"inline_featured_image":false},"activity_subject":[125],"academic_year":[68],"complexity":[60],"content_tags":[406,458,491],"activity_type":[374],"activity_duration":[179],"acf":[],"_links":{"self":[{"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/activity\/2598"}],"collection":[{"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/activity"}],"about":[{"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/types\/activity"}],"author":[{"embeddable":true,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/comments?post=2598"}],"version-history":[{"count":2,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/activity\/2598\/revisions"}],"predecessor-version":[{"id":2731,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/activity\/2598\/revisions\/2731"}],"wp:attachment":[{"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/media?parent=2598"}],"wp:term":[{"taxonomy":"activity_subject","embeddable":true,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/activity_subject?post=2598"},{"taxonomy":"academic_year","embeddable":true,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/academic_year?post=2598"},{"taxonomy":"complexity","embeddable":true,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/complexity?post=2598"},{"taxonomy":"content_tags","embeddable":true,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/content_tags?post=2598"},{"taxonomy":"activity_type","embeddable":true,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/activity_type?post=2598"},{"taxonomy":"activity_duration","embeddable":true,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/activity_duration?post=2598"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}