1.0Sensors & Controls for Flow, Pressure, Level, & Temperaturehttps://kobold.vn/enadmin_kohttps://kobold.vn/en/author/admin_ko/rich600338<blockquote class="wp-embedded-content" data-secret="pV1N8ozb1f"><a href="https://kobold.vn/en/dkf-nitrogen-refrigeration-application/">DKF – Nitrogen Refrigeration Application</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://kobold.vn/en/dkf-nitrogen-refrigeration-application/embed/#?secret=pV1N8ozb1f" width="600" height="338" title="“DKF – Nitrogen Refrigeration Application” — Sensors & Controls for Flow, Pressure, Level, & Temperature" data-secret="pV1N8ozb1f" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript"> /* <![CDATA[ */ /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://kobold.vn/en/wp-includes/js/wp-embed.min.js /* ]]> */ </script> https://kobold.vn/en/wp-content/uploads/2015/10/supermarket-refrigeration.jpg220180The idea of preserving food goes back as far as the ancient Roman and Chinese Empires. Before the advent of chemical refrigeration, food was held and shipped in ice, leading to a great deal of food waste. Various prototypes of refrigerators were built between 1755 and 1880. Many well known inventors, including Benjamin Franklin attempted [...]