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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

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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 @ 68°F -- Use AC for humidity reduction

May ------- 86°F - 66°F - 20 - Balance @ 76°F -- Cools & Heats with PCM ( 84+80) +AC Dehumidify

June ------ 91°F - 72°F - 19 - Balance @ 81°F -- Cools & Heats with PCM ( 84+80) +AC Dehumidify

July ------ 94°F - 74°F - 20 - Balance @ 84°F -- Cools & Heats with PCM ( 84+80) +AC Dehumidify

August ---- 94°F - 73°F - 21 - Balance @ 84°F -- Cools & Heats with PCM ( 84+80) +AC Dehumidify

September - 89°F - 68°F - 21 - Balance @ 78°F -- Cools & Heats with PCM ( 84+80) +AC Dehumidify

October --- 82°F - 59°F - 23 - Balance @ 70°F -- 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

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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 - Air Conditioning with Phase Change Material Manufacturers

PCM Energy P. Ltd
Mazgaon, Mumbai 400 010, INDIA
TEL: 91-22-23770100, 23774610, 23726950, 23723564
Current Date Time in India is GMT+5:30

Email: anmol@pcmenergy.com

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Last updated: 11.09.2021

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