Issues regarding the insulation and temperature maintenance of styrene storage tanks

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Hello everyone, I have been working on calculating the heat insulation for a styrene storage tank recently. An 800-liter styrene storage tank, located in a mid-sized city, with an average maximum temperature of around 36°C. It needs to be kept cold at around 8°C. The basic approach is to determine the power of the cooling cycle cooler by taking the cooling loss of the large tank, the heat generation of the pump, and the cooling loss of the pipelines into account. However, the calculation of cold loss for large tanks using the method based on heat retention of crude oil yielded extremely inaccurate results; later on, an empirical value of 15 W/m2 was used for cold loss, in addition to the power required to account for a daily temperature drop of 1°C (as a design margin). I wonder whether this approach is reasonable How do you usually calculate it?