ব্যাখ্যা: In the domestic refrigerators the evaporators are commonly known as the freezers since the ice is made in these compartments. In case of the window and split air- conditioners and other air-conditioning systems where the evaporator is directly used for cooling the room air, it is called as the cooling coil.

ব্যাখ্যা: Hydroelectric power plant: The components of hydroelectric power plant including turbine, generator and the concrete Dam are so rugged in construction that their life maybe as long as 80 years or even longer.

নোট: Total power generation capacity in Bangladesh 25,284 MW

ব্যাখ্যা: A steam generator, popularly known as a boiler, is a closed vessel made of high-quality steel in which steam is generated from water by the application of heat. The water receives heat from the hot gases formed by burning fuel through the heating surface of the boiler Steam is mainly required for power generation, process heating and space heating purposes.

ব‍্যাখ্যা : বয়লারে কয়লার জ্বলনের ফলে যে উচ্চ তাপমাত্রা ও চাপ সৃষ্টি হয় তা পানিকে বাষ্পে রূপান্তর করতে ব্যবহার করা হয়। বয়লারে যখন কয়লাকে দহন করা হয় তখন বয়লারে ক্রু গ্যাস উৎপন্ন হয়। বয়লার থেকে আসা এই ফ্রু গ্যাস সুপারহিটার, ইকোনোমাইজার, এয়ার প্রি-হিটারের মধ্যে তাপ প্রয়োগ করে চিমনি দিয়ে বায়ুমণ্ডলে বের হয়ে যায়। স্টিম পাওয়ার প্ল্যান্টের গুরুত্বপূর্ণ অংশ বয়লার। সুতরাং, বয়লারের মেইনটেন্যান্সে বেশি গুরুত্ব দিতে হবে।

ব্যাখ্যা: Hydroelectric: Hydroelectric power plant has lowest running cost because it does not needs any fuel and can be operated by few number of persons. Nuclear gas and thermal power plant requires fuels also the handling cost of fuels is added with the total cost.

ব্যাখ্যা: 99.85% electricity privileged people of Bangladesh (2022)

ব্যাখ্যা: Air-conditioning (often referred to as AC, A/C, or air con) is the process of removing heat and moisture from the interior of an occupied space to improve the comfort of occupants. In construction, a complete system of heating, ventilation, and air-conditioning is referred to as HVAC

ব্যাখ্যা: A human body feels comfortable when the heat produced by metabolism of human body is equal to the sun of heat dissipated to the surrounding and heat stared in human body by raising the temperature of body tissues. So we can say the human body feels comfortable when the heat stored in the body is zero

ব্যাখ্যা: Depreciation: The depreciation rate can also be calculated if the annual depreciation amount is known. The depreciation rate is the annual depreciation amount/ total depreciable cost. Sinking fund method. The sinking fund method is a technique for depreciating an asset while generating enough money to replace it at the end of its useful life. As depreciation charges are incurred to reflect the asset's falling value, a matching amount of cash is invested. These funds sit in a sinking fund account and generate interest. Straight line method: Straight line basis is a method of calculating depreciation and amortization, the process of expensing an asset over a longer period of time than when it was purchased. It is calculated by dividing the difference between an asset's cost and its expected salvage value by the number of years it is expected to be used.

ব্যাখ্যা: Solid fuel refers to various forms of solid material that can be burnt to release energy, providing heat and light through the process of combustion. Common examples of solid fuels include wood, charcoal, peat, coal, hexamine fuel tablets, wood pellets, com, wheat, rye and other grainx.