Answer / gajanan bharad

I am too seeking right answer, but I know that the calculations above are incorrect. We have to consider the heat generated by BTSs and not the power consumed by BTSs. We have to take into account the heat generated/ rate of heat generation in Watts by all the equipment inside the shelter. There are 48V SMPS, Battery sets, BTSs, Microwave equipment, lights and assume 2 persons working. Heat generated by the SMPS equals input power minus the output power (i.e. loss of energy in terms of heat). But for rest items need the information on heat generated. Then only we can arrive at correct air conditioner capacity requirement.

Answer / suraj.dahiya

Genarally 1 Ton capacity means---The cooling produced by
melting of 1 ton of ice in a day is.taken as unit of
refrigeration (in tons). Now unit of refrigeration used in
S.I. System is KW. 1 ton of refrigeration = mass of ice x
latent heat of ice / 24 hrs i.e
= 900 kg x 335 KJ/Kg ( one short ton = 900 kgs )
---------------------
24 x 3600 secs

= 3.4895 KJ/Sec Now we should convert KJ to KW i.e 1KJ=1KW
so 3.5 KJ / Sec = 3.5 KW
that is 1 ton of refrigeration = 3.5 KW
Always in telecom sheleters we shold take the load of BTS
For Ex: In shelter there are 4Nos of BTS,If each BTS is
consuming 20A the total Amps for 4BTS is 80A.
So The total Load of the BTS is P=VI i.e
P=230*80=18400Watts i.e 18.4KW Now each 1Ton =3.5KW we can
suggest for 5Ton of AC for 18.4 KW
plus surface area of BTS shelter suppose (9feet*6 feet)=54
sqft area.
required temp =54*25=1.350 kw
so total kw = 18.4+1.350=19.7KW
total Tr. required to cool the shelter @25 C =19.7/3.5
=5.6 Tr. AC required

Answer / chandrashekar

Genarally 1 Ton capacity means---The cooling produced by
melting of 1 ton of ice in a day is.taken as unit of
refrigeration (in tons). Now unit of refrigeration used in
S.I. System is KW. 1 ton of refrigeration = mass of ice x
latent heat of ice / 24 hrs i.e
= 900 kg x 335 KJ/Kg ( one short ton = 900 kgs )
---------------------
24 x 3600 secs

= 3.4895 KJ/Sec Now we should convert KJ to KW i.e 1KJ=1KW
so 3.5 KJ / Sec = 3.5 KW
that is 1 ton of refrigeration = 3.5 KW
Always in telecom sheleters we shold take the load of BTS
For Ex: In shelter there are 4Nos of BTS,If each BTS is
consuming 20A the total Amps for 4BTS is 80A.
So The total Load of the BTS is P=VI i.e
P=230*80=18400Watts i.e 18.4KW Now each 1Ton =3.5KW we can
suggest for 5Ton of AC for 18.4 KW

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