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PCM Energy P. Ltd

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PCM Phase Change Materials Manufacturers for Air Conditioner Conditioning & Heating HVAC for Houston USA

Natural Air conditioning with PCM in Ceiling	PCM Cooled AC Office building in Netherlands.

Houston 7200 sq. ft Warehouse, Cooling Heating HVAC PCM Phase Change Materials Air Conditioner

Calculations for a Repacking Warehose in Houston 7200 sq.ft.:

A warehouse of 7200sq.ft and 18ft height has a volume of 129600 cu. ft. Used mainly at day time. Target temperature 75C. Low humidity
Sp. Heat of air is 1KJ/Kg/K; And density is 1.2Kg/M3
For 20F (100F to 80F at peak hours) change of temperature 1M3 (35.29 cu.ft.) of air will need 1.2*1*20*5/9KJ = 13.33KJ
0.35 air change ASHRAE per hour = 129600*0.35= 45360.
So 45360cuft needs 13.33*45630/ 35.29=17236KJ/hr=17236/3600=4.78KWH
After adjusting for other losses it can go up to 5KWH.
This 100F heat remains for maximum 3 hour. Average load for overlapping 9 hours will be half this load. This makes total load as 3*5+9*5/2=37.5KWH or say 40KWH. The rest of the time is cooling & charging period for PCM.
This means we need approximately 800kg in the primary heat exchanger. We may provide 850 lbs of 84F-PCM, 850 lbs of 80F-PCM & the balance cooling & dehumidification will be by AC.
The blower capacity for PCM utilization is 756cfm=756*60 i.e.45360cuft/hr. We must buy a blower of 1000cfm (Higher cfm is proposed as the blower may not give the rated output) and provide an air baffle or an electric regulator.

Houston Average Temperature: Month High Low ΔT Mid-way Comments January 62°F 41°F 21 Can not balance Use heater for humidity reduction February 67°F 44°F 23 Can not balance Use heater for humidity reduction March 73°F 51°F 22 Can not balance Use heater for humidity reduction April 79°F 57°F 22 Balance @ 68F Use AC for humidity reduction May 86°F 66°F 20 Balance @ 76F Cools & Heats with PCM ( 84+80) +AC Dehumidify June 91°F 72°F 19 Balance @ 81F Cools & Heats with PCM ( 84+80) +AC Dehumidify July 94°F 74°F 20 Balance @ 84F Cools & Heats with PCM ( 84+80) +AC Dehumidify August 94°F 73°F 21 Balance @ 84F Cools & Heats with PCM ( 84+80) +AC Dehumidify September 89°F 68°F 21 Balance @ 78F Cools & Heats with PCM ( 84+80) +AC Dehumidify October 82°F 59°F 23 Balance @ 70F Cools & Heats with PCM ( 84+80) +AC Dehumidify November 72°F 50°F 22 Can not balance Use heater for humidity reduction December 65°F 43°F 22 Can not balance Use heater for humidity reduction

The suggested AC capacity here is 2 units of 8-10 tons, if with out PCM. We may use PCM & provide 2 units of 4 Tons or buy 1 unit of 5 tons Carrier Heat Pump (AC + Heater) & keep provision for 2nd. This is a must for dehumidification. For dehumidification, AC-fan must be on slow (unlike fast for temperature control). Carrier Air conditioner has Efficiency up to 20.5 SEER & up to 13 HSPF; Typical Heat Pump; (AC+Heater). Buying of Heat pump of any brand is user’s choice.

A 7200 sq. ft., 18ft high Repacking Warehouse in Houston. Target 75C Temperature & Low Humidity

This concept can be used in AHU for Malls Super stores and big offices for a big advantage. HVAC manufacturers can benefit from it.

Please click for a write up on Renewable Energy Related PCM Phase Change Materials Cooled House

PCM Manufacturers
Air Conditioning with Phase Change Material Manufacturers

PCM Energy P. Ltd
Mazgaon, Mumbai 400 010, INDIA
TEL: 91-22-23770100, 23774610, 23726950, 23723564. FAX: 91-22-23728264

USA & Canadian Customers may Call 773-829-5811

Email: anmol@pcmenergy.com

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Last updated: 15 February, 2013

Floating Balls of Rotterdam cooled (Air Conditioned) by Phase Change Material.