一、制冷系统正压气密性试验中的计算制冷系统比其它压力容器的气密性试验要更严格,规范要求制冷系统气密性试验需保持24小时,考虑到前6小时因刚充压不稳定,允许有不超过0.03兆帕的压力降,后18小时除温度变化而引起的误差外,压力无变化为合格。对于试验初、终压力降了多少,通过压力表可以明显看出,但是,由 I. Calculations in the air-tightness test of positive pressure in refrigeration systems The refrigeration system is more rigorous than the airtightness tests in other pressure vessels. The specification requires that the airtightness test of the refrigeration system be maintained for 24 hours, taking into account that the previous 6 hours are not due to just-pressing pressure. Stable, allowing a pressure drop of no more than 0.03 MPa, except for the error caused by the temperature change after 18 hours, no change in pressure is acceptable. For the initial and final pressure drop of the test, it can be clearly seen through the pressure gauge, but