{"id":2498,"date":"2023-06-19T08:52:12","date_gmt":"2023-06-19T08:52:12","guid":{"rendered":"https:\/\/fairconditioning.org\/fc-activity\/?post_type=activity&p=2498"},"modified":"2023-06-19T08:52:12","modified_gmt":"2023-06-19T08:52:12","slug":"cooling-load-estimation-of-a-space","status":"publish","type":"activity","link":"https:\/\/fairconditioning.org\/fc-activity\/activity\/cooling-load-estimation-of-a-space\/","title":{"rendered":"Cooling Load Estimation of a Space"},"content":{"rendered":"\n
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Objective<\/h5>\n\n\n\n

To estimate the AC Tonnage (TR) required for combating the typical fresh-air cooling load in a bedroom.<\/p>\n\n\n\n

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

Students will understand the procedure to be followed in calculating heat load requirements of a built space.<\/p>\n\n\n\n

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

Psychrometric chart<\/p>\n\n\n\n

Prerequisites<\/h5>\n\n\n\n
    \n
  1. Conceptual knowledge of psychrometry<\/li>\n\n\n\n
  2. Understanding of psychrometric chart<\/li>\n<\/ol>\n\n\n\n

    Given Data:<\/em><\/strong><\/p>\n\n\n\n

    Design Conditions (peak summer)<\/p>\n\n\n\n

      \n
    1. Ambient : DB = 40\u00b0C, RH = 60%<\/li>\n\n\n\n
    2. Desired : DB = 24\u00b0C, RH = 50%<\/li>\n\n\n\n
    3. Density of air : 1.12 kg\/m3<\/sup><\/li>\n\n\n\n
    4. 4 air changes per hour<\/li>\n\n\n\n
    5. 120 sq. ft. room, 10 ft. ceiling height<\/li>\n<\/ol>\n\n\n\n

      Conversion Factors:<\/p>\n\n\n\n

        \n
      1. 1 kW = 1 kJ\/s<\/li>\n\n\n\n
      2. 1 hr = 3,600 s<\/li>\n\n\n\n
      3. 1 m3<\/sup> = 35.32 ft3<\/sup><\/li>\n<\/ol>\n\n\n\n

        1 TR = 3.517 kW of cooling<\/p>\n\n\n\n

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

        Step 1:<\/em><\/strong> Estimate Enthalpy (H) of ambient condition and desired air conditions (kJ\/kg) and find the difference (\u2206H).<\/p>\n\n\n\n

        Step 2: <\/em><\/strong>Estimate required volumetric air flow rate (m3<\/sup>\/hr).<\/p>\n\n\n\n

        Step 3:<\/em><\/strong> Convert to mass flow rate (kg\/hr).<\/p>\n\n\n\n

        Step 4: <\/em><\/strong>Estimate cooling required (kJ\/s).<\/p>\n\n\n\n

        Step 5: <\/em><\/strong>Convert kJ\/s to TR.<\/p>\n\n\n\n

        Calculations:<\/em><\/strong><\/p>\n\n\n\n

        Step 1:<\/em><\/strong> Enthalpy of<\/p>\n\n\n\n

          \n
        1. Ambient condition (Ha<\/sub>) = 114kJkg<\/li>\n\n\n\n
        2. Desired condition (Hd<\/sub>) = 48.5kJkg<\/li>\n<\/ol>\n\n\n\n

          \u0394H= Ha<\/sub> – Hd<\/sub> = <\/em>114-48.5 = 65.5kJkg <\/p>\n\n\n\n

          Step 2: <\/em><\/strong>Volumetric air flow rate (va<\/sub>) (m3hr) = air changes per hour (1hr) volume of the room (ft3)35.32 (ft3m3)<\/p>\n\n\n\n

          = 4 120 1035.32  <\/p>\n\n\n\n

          = 135.84 m3hr<\/p>\n\n\n\n

          Step 3:<\/em><\/strong> Mass flow rate (ma<\/sub>) (kghr) = va<\/sub> (m3hr) x density of air (kgm3)<\/p>\n\n\n\n

          = 135.8 x 1.12<\/p>\n\n\n\n

          = 152.1kghr<\/p>\n\n\n\n

          Step 4: <\/em><\/strong>Cooling required (kJs) =m<\/sub>a<\/sub> (kghr) \u0394H (kJkg)3600 (shr) <\/p>\n\n\n\n

          =152.14 65.53600 <\/p>\n\n\n\n

          = 2.768kJs<\/p>\n\n\n\n

          Step 5: <\/em><\/strong>Cooling required (TR) =cooling required (kJs)3.517 (kJs-TR) <\/p>\n\n\n\n

          = <\/strong>2.7683.517 <\/em><\/p>\n\n\n\n

          \u2248 0.8 TR<\/em><\/strong> <\/p>\n\n\n\n

          Image:<\/em><\/strong><\/p>\n\n\n\n

          \"\"\/<\/figure>\n\n\n\n

          Enthalpies of air at different conditions<\/em><\/p>\n\n\n\n

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

          None<\/p>\n\n\n\n

          Source of Idea<\/h5>\n\n\n\n

          <\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

          Objective To estimate the AC Tonnage (TR) required for combating the typical fresh-air cooling load in a bedroom. Outcome Students will understand the procedure to be followed in calculating heat load requirements of a built space. Requirements Psychrometric chart Prerequisites Given Data: Design Conditions (peak summer) Conversion Factors: 1 TR = 3.517 kW of cooling […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"inline_featured_image":false},"activity_subject":[124,125],"academic_year":[68,69],"complexity":[61],"content_tags":[387,514,494],"activity_type":[371],"activity_duration":[515],"acf":[],"_links":{"self":[{"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/activity\/2498"}],"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=2498"}],"version-history":[{"count":1,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/activity\/2498\/revisions"}],"predecessor-version":[{"id":2499,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/activity\/2498\/revisions\/2499"}],"wp:attachment":[{"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/media?parent=2498"}],"wp:term":[{"taxonomy":"activity_subject","embeddable":true,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/activity_subject?post=2498"},{"taxonomy":"academic_year","embeddable":true,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/academic_year?post=2498"},{"taxonomy":"complexity","embeddable":true,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/complexity?post=2498"},{"taxonomy":"content_tags","embeddable":true,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/content_tags?post=2498"},{"taxonomy":"activity_type","embeddable":true,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/activity_type?post=2498"},{"taxonomy":"activity_duration","embeddable":true,"href":"https:\/\/fairconditioning.org\/fc-activity\/wp-json\/wp\/v2\/activity_duration?post=2498"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}