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Type: Posts; User: pyropaul

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  1. Replies
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    Try retscreen - they have weather tables for many...

    Try retscreen - they have weather tables for many locations and countries: http://www.retscreen.net/ang/home.php - you'll have to search around a bit but the tables are available. hot2000 (also from...
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    Only if the COP is higher at the lower rate -...

    Only if the COP is higher at the lower rate - otherwise there are no savings. Now the effective COP may be higher because the blower may be running more slowly in stage 1 and so the waste heat from...
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    You're getting confused between rate and volume....

    You're getting confused between rate and volume. Sure the "amp draw" is less, but the volume is lower too (i.e. output) so the system has to run longer. If you have to drive 100 miles you can do it...
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    How many residential compressors in the US use DC...

    How many residential compressors in the US use DC motors? I don't think there are any - even the inverter driven compressors are variable-frequency AC.

    Paul in Montreal.
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    Actually, it makes no difference to power...

    Actually, it makes no difference to power consumption since it is the thermostat (which is really dictated by the actual heat load required) which determines when to run the system or otherwise -...
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    The flaw in your reasoning here is that you're...

    The flaw in your reasoning here is that you're only considering the heat content of the air and have ignored the heat stored in the fabric of the building. To reduce the interior temperature by 1F...
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    Depending on the brand of heatpump, there should...

    Depending on the brand of heatpump, there should be a jumper which [ a qualified technician] can set whether the pump should allow exiting water temperature below freezing. If you have antifreeze in...
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    Lots of posts in this thread. It may be worth...

    Lots of posts in this thread. It may be worth mentioning that the ARI ratings for geothermal closed loop heating are at an entering water temperature of 32F. Looking in the performance data from...
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    I managed to sell several on craigslist for a...

    I managed to sell several on craigslist for a total of half a G - and the guy came and hauled them away too! I was surprised how many bites I got. There is a local company that refurbishes them but...
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    Really? I live in Montreal and we do need A/C in...

    Really? I live in Montreal and we do need A/C in the summer when the hot humid air from the Gulf of Mexico heads our way. There are many days in the summer where the humidex is in the high 30s and...
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    I live in Montreal where the daytime temperatures...

    I live in Montreal where the daytime temperatures often go below 0F. I have a GSHP and it works fine at those temperatures. Like any HVAC system, a load calculation and proper sizing are required by...
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    Depends where you are in Canada. Here in Quebec...

    Depends where you are in Canada. Here in Quebec we used methanol/water mix on the two vertical loop systems we have - one is 420' and the other is 500'.

    Paul in Montreal.
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    You're right, we're not getting the full...

    You're right, we're not getting the full potential but at the time it was installed there wasn't space for the buffer tank (long story). Anyway, in winter, our gas consumption goes down to about...
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    We don't have a waterfurnace unit, it's...

    We don't have a waterfurnace unit, it's ClimateMaster. I didn't see anything in the manual about not using such a setup with gas hot water tanks. Anyway, it seems to work fine - the gas consumption...
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    I'm not sure what you mean here - what difference...

    I'm not sure what you mean here - what difference does the brand make to the required maintenance? For a closed loop system, the maintenance is minimal - nothing much more than changing the air...
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    Ground-level ozone is a bad thing and is a major...

    Ground-level ozone is a bad thing and is a major cause of smog and respiratory ailments. It does nothing to filter UV and is not a useful gas to have around. There's a well tested mechanism to...
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    Chlorine is a very reactive gas and quickly...

    Chlorine is a very reactive gas and quickly reacts after it has evaporated from the pool and hence never reaches the upper atmosphere where the ozone layer is.

    CFCs and HCFCs are very stable...
  19. It's a geothermal heatpump - there is no separate...

    It's a geothermal heatpump - there is no separate air handler - everything is in one unit.

    Before you power down, you could try shorting the two testpoints together - the LEDs on the board with...
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    You mention that your house is mainly old...

    You mention that your house is mainly old construction. I also live in a 110 year old house and it is made of solid stone, bricks, plaster and lath etc. and so has high thermal mass. This effectively...
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    We paid $14 a foot on one project and $17 a foot...

    We paid $14 a foot on one project and $17 a foot on another. Hitting the water table is probably a good thing as the heat transfer capacity of wet ground is better than dry.

    Paul.
  22. Replies
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    we only have a 25' wide lot ... and were able to...

    we only have a 25' wide lot ... and were able to put in the vertical borehole for a GSHP without any problems
    http://www.mazspec.com/drilling.jpg

    So long as the drilling rig can get up your...
  23. I'm not sure what style it is considered. The...

    I'm not sure what style it is considered. The house was built in 1898


    We were lucky I guess in that no permit was required for the drilling - all I had to do was get an overnight parking pass...
  24. I live in Montreal and had a GSHP put in a house...

    I live in Montreal and had a GSHP put in a house on a very small lot - less than 25 feet from the house to the street. So instead of several holes, we did one deep one. This picture shows it can be...
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    Sounds like you're trying to do something similar...

    Sounds like you're trying to do something similar to a "passive" house. This concept is very popular in Europe, particularly Germany. You should consider shading techniques to reduce solar gain, use...
  26. Thread: Hrv/erv??

    by pyropaul
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    Teddy Bear, perhaps I was a little harsh in ...

    Teddy Bear,

    perhaps I was a little harsh in my "you're dead wrong" statement. What you're saying does make sense. Attention to detailing is important if building for air tightness. You're right...
  27. Thread: Hrv/erv??

    by pyropaul
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    1,114

    Humidity in summer is reduced by the air...

    Humidity in summer is reduced by the air conditioning so it's not a problem. We don't get super humid weather often so an HRV is good enough as opposed to an ERV. We keep the windows closed in summer...
  28. Thread: Hrv/erv??

    by pyropaul
    Replies
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    1,114

    No, you're dead wrong there. The house is 0.08ACH...

    No, you're dead wrong there. The house is 0.08ACH during all weather conditions where the windows are closed. It absolutely requires mechanical ventilation (by code and by common sense) to achieve...
  29. Thread: Hrv/erv??

    by pyropaul
    Replies
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    1,114

    Where I live (Quebec), it is a code requirement...

    Where I live (Quebec), it is a code requirement that any new residence within connection range of an electricity supply must have mechanical ventilation (HRV or ERV) that runs during the heating...
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    Copper oxide (Cu2O - brown) slowly absorbs carbon...

    Copper oxide (Cu2O - brown) slowly absorbs carbon dioxide from the air to form copper carbonate which is green ... this takes many years. Copper chloride is either white (CuCl) or blue-green (CuCl2)....
  31. We have two systems: renovation house (109...

    We have two systems:

    renovation house (109 years old) in Montreal, Quebec 3.5 ton ClimateMaster vertical loop
    New house, Eastern Townships, Quebec, 4.0 ton ClimateMaster vertical loop

    The new...
  32. Replies
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    In an airtight well insulated house, the areas of...

    In an airtight well insulated house, the areas of greatest heat loss are the windows and doors. As an earlier poster noted, this will lead to convection currents and a feeling of discomfort. As far...
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    Which is why, at least up here in my part of the...

    Which is why, at least up here in my part of the Great White North, the building regulations require mechanical ventilation. If you build tight (which you should) you must ventilate right. It's not...
  34. A water-to-water GSHP can easily do radiant floor...

    A water-to-water GSHP can easily do radiant floor heating and, via fan-coil units, air conditioning too. Or you could look at a triple function GSHP such as:...
  35. Replies
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    If your house is really dry in winter, it's...

    If your house is really dry in winter, it's probably because of air infiltration. Have you had a blower door test done? In my old house (109 years old) we did a lot of renovations to address air...
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    I think the clue is that he is an a "highly...

    I think the clue is that he is an a "highly insulated" house. Probably has low air leakage. Up here in Canada, the building codes now require mechanical ventilation since new homes are built...
  37. Replies
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    The HRV exhausts are in the bathrooms, the supply...

    The HRV exhausts are in the bathrooms, the supply side of the HRV (post heat exchanger) is connected to the return air of the main HVAC system so the regular HVAC ducts provide the source for the...
  38. Replies
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    We built a new airtight house and, of course,...

    We built a new airtight house and, of course, included a HRV system. We were recommended not to put fans in the bathrooms but to put in switches that switch the HRV into max for 20 minutes. The...
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    It's been an average of -20C (-4F) here in...

    It's been an average of -20C (-4F) here in Montreal for the past week with daytime "highs" of -18C (0F) and nighttime lows of -25C (-11F). Today it was warmed up to a balmy 12C (10F) ... the GSHP is...
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    We have a system which doesn't have an extra...

    We have a system which doesn't have an extra buffer tank and it works well. The tank is gas heated and the gas consumption goes down to near zero in winter. However, we're only two and don't use huge...
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    I stand corrected. The flow module we have uses...

    I stand corrected. The flow module we have uses two Grundfoss circulators rated at 377W - I don't know what their under-load consumption is though. I guess once the liquid in the loop gets moving,...
  42. Replies
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    Not true. We have a closed-loop system and it...

    Not true. We have a closed-loop system and it uses two Grundfoss circulators that are rated at 377W each - 0.6A would only be 60W. With the two circulators in series, I'm not sure what their actual...
  43. Replies
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    We have a ~4000 square foot home (3100 main...

    We have a ~4000 square foot home (3100 main levels plus about 1000 heated basement) that in only has a 4 ton GSHP. It was below 0F outside the past few days and the GSHP was not running continuously....
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    Here in Quebec it is over 98% and is closer to...

    Here in Quebec it is over 98% and is closer to Can$0.07 per kwh ... so heatpumps are very economical to run, especially GSHPs with their pretty much constant COP.

    Paul.
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    I guess you didn't read all the equations then. I...

    I guess you didn't read all the equations then. I also suspect that you don't appreciate the difference between a hypothesis and a theory.

    (I) ClO + ClO + M -> Cl2O2 + M
    Cl2O2 + hv...
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    Try this one: ...

    Try this one:

    http://www.atm.ch.cam.ac.uk/tour/part3.html

    Might not be refrigerant as a lot of CFCs were released from aerosol sprays in the 60s and 70s but the article does show the chemical...
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    Did your science teacher actually have a degree...

    Did your science teacher actually have a degree in any kind of science discipline? Because if he or she did, they would know that the ultraviolet light filtered by the ozone layer does not contain...
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    Ozone filters out ultra violet radiation. UV has...

    Ozone filters out ultra violet radiation. UV has no "heat" potential in it whatsoever. As I said earlier, there is no relationship between the thickness of the ozone layer and global warming. The...
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    CFCs cause ozone depletion. This has nothing...

    CFCs cause ozone depletion. This has nothing whatsoever to do with global warming. It amazes me how often these two issues are conflated. That said, CFCs, HCFCs and HFCs (as well as methane) are also...
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    How will it screw up the water? All he would be...

    How will it screw up the water? All he would be doing is taking water out of one well, passing it over a heat exchanger and then putting it back in the ground. The actual water consumption would be...
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