真空预冷指的是在正常大气压（101.325kPa）下，水在100℃蒸发，如果大气压为610Pa，水在0℃就蒸发，水的沸点随着环境大气压的降低而下降。沸腾是快速地蒸发，会急速地吸收热量。新鲜果蔬放在密闭的容器中，迅速抽出空气和水蒸汽，随着压力的持续降低，果蔬会因不断地、快速地蒸发水分而冷却。

人造冰雪机组：人造冰雪又称人工造雪，是指人为地，通过一定的设备或物理、化学手段，将水（水气）变成雪花或 [1]  类似雪花的过程。人造雪制造方式分为炮筒式与冰片粉碎式。自然雪花密度约为328公斤/立方，而人造雪密度约为856公斤/立方。从本质上看，人造雪和自然雪是相同的，但人造雪的密度更大。因此在相同条件下，同体积人造雪比自然雪融化慢。

Lěngdòng, zhǐ jiàngdīwēndù, shǐ wùtǐ nínggù, dòngjié. Yě jiào “zhìlěng”, shì yìngyòng rèlìxué yuánlǐ, yòng réngōng zhìzào dīwēn de fāngfǎ, bīngxiāng hé kòngtiáo dōu shì cǎiyòng zhìlěng de yuánlǐ. Cóng huàgōng de jiǎodù, yībān dōu shì cǎiyòng yī zhǒng línjiè diǎn gāo de qìtǐ, jiā yā yèhuà, ránhòu zài shǐ tā qìhuà xī rè, fǎnfù jìnxíng zhège guòchéng, yèhuà shí zài qítā dìfāng fàng rè, qìhuà shí duì xūyào de fànwéi xī rè. Zhōngyāng kòngtiáo, luógān lěngshuǐ jī, fēng lěng mókuài rèbèng kòngtiáo jī, yánshuǐ dī wēn jī, rèbèng rè shuǐ gōngchéng, héngwēn héng shī kòngtiáo, jīngmì kòngtiáo, sùdòng, lěngdòng, lěngcáng kù, jiéjìng jìshù yǔ jìnghuà xìtǒng gōngchéng shèjì hé ānzhuāng yèwù. Yǒngyǒu zhuānyè nuǎn tōng zhìlěng wéihù wéixiū: Xiùhuàlǐ jīzǔ, líxīn yāsuō jī, luógān yāsuō jī, wō xuán yāsuō jī, huósāi yāsuō jī, wéixiū wéihù gēnghuàn wéihù.

Freezing means lowering the temperature and allowing the object to solidify and freeze. Also called "refrigeration", it is the application of thermodynamics principle, the method of artificially manufacturing low temperature, refrigerator and air conditioner are all based on the principle of refrigeration. From the chemical point of view, it is generally used a gas with a high critical point, pressurized and liquefied, and then it is vaporized and absorbed, and this process is repeated. When liquefying, it is exothermic in other places, and when it is vaporized, it absorbs heat to the required range. . Central air conditioning, screw chiller, air-cooled module heat pump air conditioner, brine cryogenic machine, heat pump hot water project, constant temperature and humidity air conditioning, precision air conditioning, quick freezing, freezing, cold storage, clean technology and purification system engineering design and installation business. Have professional HVAC maintenance and repair: lithium bromide unit, centrifugal compressor, screw compressor, scroll compressor, piston compressor, maintenance and repair.