1. The document discusses building survey for air conditioning heat load calculation. It explains that a building survey needs to be conducted to understand the various heat sources in the building in order to accurately estimate the heat load.
2. Physical factors that need to be considered during the survey include heat from lights, fans, people, plugs and sockets. Ventilation heat, outside air temperature, and wall/roof heat transmission should also be accounted for.
3. Standard charts and tables from organizations like ASHRAE, ARI and Carrier provide data on ventilation heat, outside air heat, and heat from common building elements to simplify heat load calculations.
25. 1. Space Characteristics and Heat Load Sources.
2. Computer Application in Cooling Load Calculation:
3. MATERIALS AND APPLICABLE METHOD
4. Space Design Cooling Load Calculation by CLTD/SCL/CLF
5. External Cooling Loads: (i) Roofs, walls and glass: The basic cooling
load equation for exterior surfaces such as roofs, walls, and conduction
through glass is given as;
q = U × A × CLTD……….. (1)
(*) Fenestration: Space cooling load from fenestration include the heat
gain from conduction and solar radiation. The cooling load from
conduction and convection heat gain is calculated by;
q
cond = U × A × (CLTD)…… (2)
qrad = A × SC × SCL ............. (3)
6. Partitions, ceilings, and floors: The cooling load from
partitions, ceilings, and floors is calculated as follows;
q = U × A ta − trc ……….…..(4)
Presented By : A.M.Atiqullah INSTRUCTOR(Tech) RAC DHAKA POLYTECHNIC INSTITUTE,TEJGAON I/A Dhaka-1208
26. Presented By : A.M.Atiqullah INSTRUCTOR(Tech) RAC DHAKA POLYTECHNIC INSTITUTE,TEJGAON I/A Dhaka-1208
7. Internal Cooling Loads: (A). “People”: The total sensible heat
qs = N × SHGp CLFp ….. (5) And the latent cooling load due to people is:
ql = N × LHGp…………... (6)
(B). “Lights”: At any time, the space cooling load from lighting can be estimated as;
qel = W × Ful × Fsa × CLFel ….. (7)
(C). “Power”: The cooling load value of power-driven equipments can be calculated as:
qp = P × Ef × CLF ……….(8)
(D). “Appliances”: To calculate the cooling load capacity of appliances in a
particular circumstance either of the following equations can be applied;
q (sensible) = q input × FU × FR × CLF …..…. (9) Or,
q sensible = q input × FL × CLF…………... (10)
E. “Ventilation and Infiltration Air”: Space cooling load due to
ventilation and infiltration air is calculated as follows;
q sensible = 1.23 × Q to − ti………………... (11)
q latent = 3010 × Q W0 − Wi …………...… (12)
q = 1.20 × Q h0 − h …………………….(13)
38. 4.1 Calculate the intensity of direct radiation on a surface on the
following criteria. a) The component of direct radiation normal
to a horizontal surface. b) The component of direct radiation
normal to a vertical plan.
4.2 Calculate the glass area in the sun.
4.3 Calculate steady state heat transfer through glass.
Presented By : A.M.Atiqullah INSTRUCTOR(Tech) RAC DHAKA POLYTECHNIC INSTITUTE,TEJGAON I/A Dhaka-1208