Doors, cold store

Figure 15.8 Double sliding cold store doors, power operated (Courtesy of Clark Door Ltd)...

The ideal arrangement is to back the vehicle up to a door with a sealing collar, so that the contents may move directly into the store without exposure to ambient temperatures. If the height differs from that in the store, adjustable platforms are fitted at the door. Where fork-lift trucks have to pass in and out of a cold store, plastic strip curtains are used (see Figure 20.2). 

Figure 20.2 Strip curtain at cold store door...

Convection heat gains from infiltration, fresh air and the normal opening of cold store doors. 

Poor discipline of loaders and fork-lift truck drivers, leaving cold store doors and sealing gaskets open, with gain of heat and more icing in store and on coolers. 

Improved cold store door-operating mechanisms (see Figure 15.8). 

Containers of flammable liquids are sometimes stored in refrigerators or cold rooms. The assumption here is that since the temperature of the liquid is lowered, the vapor pressure of the liquid is correspondingly decreased. However, an inspection of the properties of some of the most highly flammable liquids in use in the laboratory (Table 16.4) reveals that their flash points are still well below storage temperatures in laboratory refiig-erators and freezers. Evaporation can still occur, albeit more slowly however, in the closed chamber an explosive mixture may be rapidly achieved. A spark from a door switch, light, mullion heater, defrost timer, compressor re-... 

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