** Road disorder needs proper implementation of law ** Global food supply risks rise as key traders leave Russia ** 56 hurt in clashes among AL, BNP and cops in Natore, Khulna, Rajshahi ** Bangladesh serves as a model for rest of world: US Asst Secy Noyes ** People crowd the shop of a Trading Corporation of Bangladesh dealer for essential commodities at subsidised prices in Dhaka's Lalbagh on Saturday amid high prices of daily necessities in the market. Agency photo ** Rohingya national shot dead in Cox's Bazar ** BFUJ, DUJ express concern over misuse of DSA ** Dhaka seeks greater Dutch support for Rohingya repatriation ** I told DB everything I know about Arav Khan: Hero Alom ** Three Juba Dal leaders expelled for attack on journalists ** Several arrested from Paltan after chase, counter-chase ** UN Human Rights chief urges immediate suspension of DSA ** Trump indicted, first US president to face criminal charges ** A road beside Humayun Shaheb Railgate, Golapbagh, in the capital damaged due to ongoing rail line installation work and waterlogging by rainfall in the area causing sufferings to the pedestrians, commuters as well as the drivers. This photo was taken on Friday. ** Body of Chinese engineer recovered from sea ** Journalist Shams taken to Kashimpur jail ** IMF needs billions from rich nations to help poorest countries ** US expresses deep concern over use of DSA in Bangladesh ** HRW: Halt Rohingya repatriation plan ** Activists of left leaning students bodies stages a rally at Dhaka University premises in the capital on Thursday protesting the arrest of Prothom Alo journalist Samsuzzaman Shams. NN photo ** Repeal of Digital Security Act demanded ** Prothom Alo journalist Shams denied bail, sent to jail ** Japan to provide $1.27b to Bangladesh for three key projects ** HC verdict on Zahangir's GCC mayoral post deferred ** Private firm to supply gas from Bhola to industries in Dhaka **

Readers’ Voice

31 January 2023

Winter and summer AC

There is a conflict between summer and winter air conditioning system (AC). For a long time, AC has been put to use as a cooling appliance that keeps us comfortable during summers. But is it of no use in winter? Surely not. In winter also ac can give us the same comfort by producing heat which makes our houses comfortable and warm during the cold season.
Asking for comments on this topic, A. M. Atiqullah, chief instructor of refrigeration and air conditioning department in Dhaka Polytechnic Institute has said that, "AC can be used as a heater in winter season. Not all ACs can be used as heaters. Only those ACs which come fitted with a Heat Pump are appropriate for use as a heater".
He also has said that when the heat mode is turned on, the Air Conditioner unit produces warm air.
During winters, a lot of humidity gathers on the doors and windows. Running the air conditioner will help in dehumidifying the air in the house, this will also keep doors and windows clear. Thus Ac as a heater is a great choice. Running ac in winter season
ensures that it remains in good working condition as electronic devices should not remain unused for a long time. This also makes sure that the AC fan is not back-up by ice, dust, snow, etc. Besides, it also saves space in the rooms.
When we use AC as a heater in winter, it also saves the extra space, which would have been taken by any heating equipment.

Engineer Ali Abdullah Tanvir
Ex student of Dhaka Polytechnic Institute

Save rivers from erosion

Dredging on waterways is required to ensure navigability while sand collection is also necessary for infrastructural development. However, unplanned sand extraction and whimsical river excavation have been posing serious threat to biodiversity and causing river erosion in different parts of the country. A set of definite instructions and an accurate mapping must be prepared to determine from which part of the river sand can be extracted.
Some local musclemen often control Balu Mahal illegally. Therefore, none other than the assigned contractors will be able to extract sand in any way. Proper initiative, coordinated effort and a unified system are highly expected from the authorities concerned with an aim of ending-up indiscriminate sand extraction and saving the country's rivers from erosion.

Wares Ali Khan
Sadar, Narsingdi

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