Products

Rough Description

And actual customer feedback during a hot weather spell Oct 2021 of a Microsolar Cooler user in an intermediate terrace house in Bandar Utama Petaling Jaya, Selangor, Malaysia, to the question "How are the Microsolar Coolers doing so far? How much of a reduction in aircond bills compared to before Microsolar Cooler installation? How are the Microsolar Coolers holding up with the warm weather?"

For these happy customers, air cond use is greatly reduced to only on very hot afternoons only compared to before (when the air cond had to be switched on for the whole house upstairs and downstairs most of the days and nights). But now, the air cond has to be switched for much less hours and sometimes not switched on at all.. Even if the aircond is switched on, its compressor load is much less now compared to before. For instance assume on a hot afternoon the outside temperature is 33c whilst the required indoor target temperature is 23c, the air cond has to work hard to overcome a temperature difference of 10c. But with Microsolar Coolers installed, the indoor temperature might drop to 28c naturally. If the air cond then has to be switched on it only has to overcome a temperature difference of 5c (instead of 10c) to reach target temperature of 23c. Thus a 50% reduction in aircond bills is achieved.. And the air cond, even any old air cond, will seem doubly cool when switched on compared to before. And this leads to much more efficient air cond compressor running, less maintenance issues with the air cond system

MICROSOLARCOOLER ROI 2.5 YEARS

While the Microsolar Solar Cooler runs 24/7, consumes 1.08 Kwh per day, 32 Kwh per month or RM16.00 (USD 4.00) per month of electricity. A rough estimate of the Microsolar Cooler for comparision is the Microsolar Cooler is the equivalent of 0.75 hp air cond running 24/7, saves RM180.00 (USD42.00) per month. That is RM 2160.00 (USD502.00) per year annual savings. Cost installed is RM5300.00 (USD1230.00) per Cooler, so Return On Investment is RM5300 ÷ RM 180 = 29.4 months which is 2.5 years ROI. So it is always more efficient to use the Microsolar Solar Cooler to do the initial heavy lifting of bringing down the temperatures before using the precious solar PV electricity to run the air conditioning. Generally the Microsolar Cooler reduces the air conditioning load by 50%. Then the Solar PV Panels size can be reduced by half.. This combination with Passive Cooling will make solar PV air conditioning less expensive, (if the Client wishes to install solar PV for air conditioning, that is).

Technical Specifications

Tank material : 304 stainless steel
Frame and Casing : Stainless steel/ Aluminium
Water consumption : Approx 2 - 5 litre per day depending on weather
Electrical consumption : Approx 0.36 kwh/day, 10.8 kwh/mth, RM5.40/month (USD1.50/month)
Roof Slope angle : 3 to 25 degree to horizontal for metal decking roof, 15 to 32 deg to horizontal, roof tiles, or shingle.
Hail resistance : 25mm diameter. Hole to be opened on roof (or 6 roof tiles to be removed) : Approx 400mmx400mm to 600mmx600mm Ceiling vent grilles (if ceiling attic is present) to be opened in ceiling
: Approx 6 pcs vent 200mm x 200mm each or equivalent (size and numbers of vents required may vary from house to house, or building to building).
There will be a stainless steel drain tube 25mm max length 2m extending down from the Cooler on roof down into the attic or building as the case may be . This is to be connected to the drain piping provided by others. (In winter freezing conditions, or when it is too cold, the drain valve is to be opened and the water supply valve shut to drain the system.)
Work to be done by others (Client to provide or Client may separately engage Contractors proposed by Microsolar) : 0.5 inch (15mm) diameter HPDE piping cold water supply to within 1 m of Solar Cooler on rooftop.
0.5 inch HDPE drain pipe in ceiling attic from within 1 m of Solar Cooler sloping down with stop vavle to outside drain or balcony drain or bathroom drain.
: 13 amp weatherproof electricity supply to within 1 m of Solar Cooler on roof top or in attic/ceiling space.
Client’s Exhaust Fans. To help exhaust excess hot air from the building, it is recommended that Client provide a 16 inch (400mm) diameter stand fan facing out 24/7 at high level at window on upper floor .

Case Studies

Case I

Microsolar Passive Solar Cooler Case Study 1: Terrace House End Lot in Subang Jaya, Selangor, Malaysia.
Elevation 30m above sea level. 03.064422deg N, 101.589029 deg E .
Weather: Temperature in Subang Jaya is relatively constant throughout the year .
Data from 1975 to 1995 at Subang Airport (6km from Subang Jaya). During these years before 1995 Subang Airport was well surrounded by greenery and rubber estates. However since then it has become much more built up and the below temperatures are expected to rise due to urban heat island effect : Average dry bulb whole year day and night 26.9c.
Average peak dry bulb 32c at 1400hrs , max dry bulb 35.6c at 1500hrs
Average low dry bulb 23.7c at 0600hrs , lowest dry bulb 20.6c at 0700hrs.
Average peak of wet bulb 25.4c at 1400hrs, max wet bulb 28.4c at 1400hrs.
Average low wet bulb 23.1c at 0600hrs, lowest wet bulb 19.9c at 0700hrs.
Note that maximum temperature recorded in Subang Jaya has since greatly exceeded the 1975 to 1995 Subang Airport data, with max dry bulb reaching 38c in 2019.
The house is a double story end lot terrace house , about 1600 sft (160m2) built up area.
Masonry brick walls, concrete floor slabs, uninsulated cement roof tiles, roof slope 30 deg to horizontal. The east side of the house has some tree shading.
The picture shows installation of a prototype Microsolar Passive Solar Cooler on a house in Bandar Sri Damansara, Kuala Lumpur, Malaysia 20210130 next to a still functioning 20 years old Microsolar Water Heater on right foreground (this house is similar in area to the Case Study house).

Case II

Note on Case Studies: Please note that these Microsolar Solar Cooler Case Studies results may not necessarily be comparable or transferable to other buildings, they are just a snapshot of a particular building at that time. Other buildings may vary in temperature results due to different building and site conditions, insulation and natural ventilation levels etc.