Payback period of investments in energy saving = Период возврата инвестиций в энергосбережение / A. S. Gorshkov, N. I. Vatin, P. P. Rymkevich, O. O. Kydrevich. — 1 файл (1,17 Мб). — DOI 10.18720/MCE.78.5. — Текст: электронный // Инженерно-строительный журнал / Санкт-Петербургский политехнический университет Петра Великого. – 2018. – № 2 (78). — С. 65-75. — Загл. с титул. экрана. — Свободный доступ из сети Интернет (чтение, печать, копирование). — <URL:http://elib.spbstu.ru/dl/2/j18-505.pdf>.
| Period | Read | Copy | Open | Total | ||
|---|---|---|---|---|---|---|
| Year 2019 | Quarter 1 | 14 | 0 | 17 | 0 | 31 |
| Quarter 2 | 12 | 0 | 14 | 0 | 26 | |
| Quarter 3 | 7 | 0 | 14 | 0 | 21 | |
| Quarter 4 | 4 | 0 | 10 | 0 | 14 | |
| Year 2020 | Quarter 1 | 13 | 0 | 10 | 0 | 23 |
| Quarter 2 | 13 | 0 | 0 | 0 | 13 | |
| Quarter 3 | 20 | 0 | 0 | 0 | 20 | |
| Quarter 4 | 36 | 1 | 34 | 0 | 71 | |
| Year 2021 | Quarter 1 | 23 | 0 | 17 | 0 | 40 |
| Quarter 2 | 15 | 0 | 10 | 0 | 25 | |
| Quarter 3 | 14 | 0 | 12 | 0 | 26 | |
| Quarter 4 | 8 | 0 | 28 | 0 | 36 | |
| Year 2022 | Quarter 1 | 8 | 0 | 17 | 0 | 25 |
| Quarter 2 | 8 | 0 | 8 | 0 | 16 | |
| Quarter 3 | 8 | 0 | 9 | 0 | 17 | |
| Quarter 4 | 21 | 0 | 7 | 0 | 28 | |
| Year 2023 | Quarter 1 | 13 | 0 | 13 | 0 | 26 |
| Quarter 2 | 7 | 0 | 12 | 0 | 19 | |
| Quarter 3 | 5 | 0 | 6 | 0 | 11 | |
| Quarter 4 | 58 | 0 | 11 | 0 | 69 | |
| Year 2024 | Quarter 1 | 12 | 0 | 10 | 0 | 22 |
| Quarter 2 | 16 | 0 | 26 | 0 | 42 | |
| Quarter 3 | 12 | 0 | 25 | 0 | 37 | |
| Quarter 4 | 39 | 0 | 18 | 0 | 57 | |
| Year 2025 | Quarter 1 | 24 | 0 | 16 | 0 | 40 |
| Quarter 2 | 43 | 0 | 15 | 0 | 58 | |
| Quarter 3 | 11 | 0 | 6 | 0 | 17 | |
| Total | 464 | 1 | 365 | 0 | 830 | |