nilrat, manop, sakesun suthummanon, and juntakan taweekun. “Analysis of Heat Loss from Insulation Deterioration by Applying Value Engineering Technique for a Boiler of a Thermal Power Plant”. Naresuan University Engineering Journal, vol. 12, no. 1, July 2017, pp. 115-30, https://ph01.tci-thaijo.org/index.php/nuej/article/view/73617.