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Physics, 05.08.2021 06:50 perez120

2. Máy lạnh dùng NH 3 với hai cấp nén, một van tiết lưu có bình làm mát trung gian hoạt động với các thông số sau:
- nhiệt độ bay hơi t o = -30 o C ; nhiệt độ ngưng tụ t k = 30 o C
- nhiệt độ sau làm mát t 3 = t k = 30 o C ; năng suất lạnh Q o = 70 kW
- nhiệt độ nước làm mát vào và ra ở bình ngưng là 24 o C và 27 o C
Xác định:
- Tỷ số nén  (bar)?
- Áp suất trung gian p tg (bar)?
- Lưu lượng tác nhân lạnh (kg/s)?
- Công suất nén đoạn nhiệt N s (kW)?
- Hệ số làm lạnh lý thuyết ?
- Nhiệt tỏa ra ở bình ngưng và bình làm mát (kW)?
- Lưu lượng nước cần làm mát bình ngưng (m 3 /h)?

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