Phase Change Material PCM Electronic Chamber Cooling Temperature Control
If you are versed with Phase Change Material, then you may directly read the matter below the horizontal line. If you need to understand more then you may go in the following order:
Introduction to PCM Air Condition
Phase Change Material Non Hazardous Salts
Peak Load Shifting in AC Air Condition
After reading this much you may shift below the horizontal line. You may also check the following pages:
Energy Saving tips for Lighting, Insulation and Windows, Renewable Energy, Air Change Rate etc
Phase Change Material for Electronic Comfort
PCM for Green House.
Electronic Comfort is the temperature at which the electronic equipment will perform efficiently. We have come across uses that will want temperature below 95F or below 115C or 140C and so on. In one application the party specified it as 70C (158F) and 78C (172F). Phase Change Material melting at various temperature is used for controlling the temperature.
Temperature maintained below 95F (35C) in Basic Telecom Shelter BTS.
A BTS is at the bottom of a telecom tower. It has its electronic components and a battery. It generates its own heat and it is required o be maintained below 95F, irrespective of the ambient temperature. This is ordinarily done by air conditioning. We were asked to design a system with PCM based unit that will last for about 6 hours even after the Air condition is switched off. The live site trial of the system is shown below.
Live-Site Trial in a Telecom Shelter after Retro-fitting it with 210 Kg of PCM Latest™29T (10 KWH back-up
210 Kg of Latest29T PCM (10KWH) filled profiles were installed in an existing BTS Basic Telecom Shelters of 2m Length by 2.5m width by 2.7m Height. Five thermometers were installed to measure temperature at various points. The Air-condition was switched off when the temperature was 17.3oC. Ambient temperature was also measured. The battery voltage was observed as per the instruction of the site-officer. The permissible maximum temperature that can be reached was targeted to 36oC. This temperature was not reached in 6 Hours of the run. In a blank reading with-out Latest29T PCM the target maximum temperature crossed in less than 1 hour.
Better viewed on big Screen.
Minutes after Power Shutdown - 0min - 030m - 060m - 120m - 180m - 210m - 270m - 300m - 330m - 360m
Average Temp°C (of 5 Sensors)- 17.3 - 22.4 - 25.2 - 29.1 - 31.3 - 32.1 - 32.8 - 33.1 - 33.2 - 33.3
Other Relevant Record
Outside Temp°C --------------- 26.5 - 28.0 - 29.5 - 31.0 - 33.0 - 33.0 - 30.0 - 28.5 - 28.0 - 26.7
Battery Voltage -------------- 25.18- 24.99- 24.98- 24.65- 24.45- 24.21- 23.89- 23.61- 23.45- 22.94
Shelter Temp Centre Top °C --- 17.5 - 23.1 - 25.8 - 29.5 - 31.0 - 31.7 - 33.5 - 33.5 - 34.0 - 34.1
Permissible limit of Trial was up to Shelter Temperature of 35°C. The Trial was discontinued as the Battery Voltage went low.
The PCM could have lasted for 1-2 Hours more, if the Battery Voltage had not dropped.
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Phase Change Materials used for electronic comfort, heat sinks
Melting Point oC Latent Heat (L.H.) KJ/Kg & Specific Gravity Freezer Salt -58°F or -50°C 325 L.H in KJ/Kg & Sp.Gr. = 1.3 -09°F or -23°C 330 L.H in KJ/Kg & Sp.Gr .= 1.2 -03°F or -16°C 330 L.H in KJ/Kg & Sp.Gr. = 1.02 Ice 32°F or 00°C 335 L.H in KJ/Kg & Sp.Gr. = 1 Preservation 39°F or 04°C 105 L.H in KJ/Kg & Sp.Gr. = 1.4 45°F or 07°C 135 L.H in KJ/Kg & Sp.Gr. = 1.4 45°F or 07°C 300 L.H in KJ/Kg & Sp.Gr. = 1.4 Only know-how offered. 50°F or 10°C 170 L.H in KJ/Kg & Sp.Gr. = 1.4 59°F or 15°C 175 L.H in KJ/Kg & Sp.Gr. = 1.4 Air Condition - Electronics - Solar 65°F or 18°C 175 L.H in KJ/Kg & Sp.Gr. = 1.5 70°F or 21°C 175 L.H in KJ/Kg & Sp.Gr. = 1.5 75°F or 24°C 175 L.H in KJ/Kg & Sp.Gr. = 1.5 80°F or 27°C 175 L.H in KJ/Kg & Sp.Gr. = 1.5 84°F or 29°C 175 L.H in KJ/Kg & Sp.Gr. = 1.5 90°F or 32°C 210 L.H in KJ/Kg & Sp.Gr. = 1.4 97°F or 36°C 260 L.H in KJ/Kg & Sp.Gr. = 1.4 104°F or 40°C 220 L.H in KJ/Kg & Sp.Gr. = 1.4 113°F or 45°C 220 L.H in KJ/Kg & Sp.Gr. = 1.4 118°F or 48°C 220 L.H in KJ/Kg & Sp.Gr. = 1.4 136°F or 58°C 220 L.H in KJ/Kg & Sp.Gr. = 1.4 154°F or 68°C 220 L.H in KJ/Kg & Sp.Gr. = 1.8 158°F or 70°C 230 L.H in KJ/Kg & Sp.Gr. = 1.8 172°F or 78°C 240 L.H in KJ/Kg & Sp.Gr. = 1.8 192°F or 89°C 145 L.H in KJ/Kg & Sp.Gr. = 1.5-1.6 We have PCM & Heat-Treatment Salts upto 1100oC The Yellow Marked Products are running items and extensively used world wide.
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