How cold is too cold for my heat pump??
kjboggs
15 years ago
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tigerdunes
15 years agoRelated Discussions
How cold is too cold for broc and cauli seedlings?
Comments (29)adrock- I'm starting to think, with a low tunnel, I could protect down to 10F under optimal conditions (sun the day before), 2 layers of plastic (or tarp), frost blanket inside. Extended forecast now looks good. Outside temp is 33F and inside the hoop its 74F at seedling level (probably much warmer up higher). I left all my seedlings in the garage last night and they were fine. I'm sick of bringing them inside. Plan on planting in the ground tomorrow if the forecast looks good. I'm erecting another 20ft long tunnel too....See MoreHow cold is too cold?
Comments (7)My driveway and patio were poured in late December without incident and was "walk on" firm in two days. The tin layer of ice and snow that formed on the "blankets" that first evening did not affect the pour. Although many cement contractors are reluctant to assist DIYer, many of their laborers are not. I gained a lot of information from a worker with 10 years experience in concrete work. The adding of calcium chloride is a boon to concrete work and has been successfully used for years. I am not a chemist: I am a creative artist. As artist we strive to create better and varied art pieces. We experiment with both new and old ideas (some work some don't) or like many other "schools" we stagnate, people lose interest, and the art form dies. I think I will try some calcium chloride in a batch of peat moss tufa just to see the effect. The heat generated by the calcium chloride might reduce the curing time that is such an impairment to many successful tufa projects. There is also the possibility that the inclusion of calcium chloride would be an aid when making thin set garden spheres. As far as, "less chemicals the better" I am lost. We humans are nothing more than a living, breathing chemical factory. However, here are some of the uses for calcium chloride (CaCl2) that you might find interesting. As an ingredient, it is listed as a permitted food additive in the European Union for use as a sequestrant and firming agent with the E number E509. The anhydrous form has been approved by the FDA as a packaging aid to ensure dryness (CPG 7117.02). Calcium chloride is commonly used as an Electrolyte and has an extremely salty taste, as found in sports drinks and other beverages such as Smartwater and Nestle bottled water. It can also be used as a preservative to maintain firmness in canned vegetables or in higher concentrations in pickles to give a salty taste while not increasing the food's sodium content. It is even found in snack foods, including Cadbury Caramilk chocolate bars (purpose unknown). It can be used to make a caviar substitute from vegetable or fruit juices or added to processed milk to restore the natural balance between calcium and protein for the purposes of making cheese such as brie and stilton. Calcium chloride's exothermic properties are exploited in many 'self heating' food products where it is activated (mixed) with water to start the heating process, providing a non-explosive, dry fuel that is easily activated. In brewing beers (esp. ales and bitters), calcium chloride is sometimes used to correct mineral deficiencies in the brewing water (calcium is important for enzyme function during the mash, for kettle protein coagulation (the "hot break") and yeast metabolism) and adds permanent hardness to the water. The chloride ions enhance flavor and give a perception of sweetness and fuller flavour, whereas the sulfate ions in Gypsum, which is also used to add calcium ions to brewing water, tend to impart a drier, crisper flavor with more bitterness. Aided by the intense heat evolved during its dissolution, calcium chloride is also used as an ice-melting compound. Unlike the more-common sodium chloride (rock salt or halite), it is relatively harmless to plants and soil...See MoreOK...cold is bad...but how cold is too cold?
Comments (24)Michelle: my question is why don't we want to use plastic, and by doing so, why can't it touch the plants and leaves? You can use plastic if that's all you have, and lots of people use clear plastic wrapped around tomato cages, etc. for its greenhouse-like effects. It's just that there are better insulators than plastic. The not touching the leaves thing is probably for two reasons: 1) It's the air trapped under the plastic that insulates the plants, and where the plants touch the plastic, there is no insulation, and, since the plastic itself is a poor insulator, it will essentially conduct the cold directly onto plant parts in contact. With things like actual frost blankets, etc., there are also tiny air pockets in the cloth itself that provide insulation. Plastic doesn't have that. Think about how well you can feel hot and cold through plastic gloves vs through cloth gloves. 2) Moisture condenses easily on plastic and stays there, and parts of plants that get wet during a frost can be more damaged than parts of plants that stay dry. Frost cover, etc. tends to be breathable and wicks moisture so doesn't present this problem as badly. I don't think it's a big deal if a few bits and pieces here and there come in contact with plastic, such as would happen if you wrapped a tomato cage in plastic. But sometimes people misunderstand wrapping and do it too tightly....See MoreWill a heat pump make my basement cold?
Comments (11)Hi Neo - Yes, I like it very much. I had it for about 4-5 months now, and it is saving me about $20/month off my electric bill. As someone has mentioned, there is a noise from the fans when it is operating that sounds like a handheld vacuum cleaner - it bothered me for about 2 weeks intially when the house is quiet at night... but I have gotten used to it and now it is just pure background noise. The water heater is in my unfinished basement, and as I mentioned above, I have no problem in terms of cooling the room and "stealing" heat form the house. I would like to address some people's concern about this stealing heat from house during winter: I have posted my reasoning and argument of why I think you will still come out ahead in another forum. ****** 1. Since it is only heating the water and not the whole house, using air natural and forced convection to earth seems to be good enough. Recently, I put a digital thermostat in my basement about 10' from the GE water heater. While running, the temperature readings dropped about 2-3F. After finished heating, the basement temperature reverts back to "normal" (about 60F nowadays). 2. I am fully aware and and am considering the whole house energy balance system, and it is my contention that you will still save money during the heating months. Let's use a simple theoretical example to illustrate my point: let say you use 100,000BTU of water heating a month and it costs $100 with a typical 90% efficient electric water heater. The home is using a 300% efficient electric heat pump to heat the house during the winter. That means is will only cost $30 to get the same 100,000 BTU of heat energy ($100 * 90%/300%). Now, you have to add the heat pump water heater efficiency to move the heat from the house to the water - the GE water heater is rated at 235% efficiency, so that will take about $38 and makes the total cost to be $30 + $38 = $68... a lot better than $100 using the standard electric resistance heaters. Granted, it is not better than the cooling months in which the heat pump is additive to the whole house energy equation. However, it is still saving you money during the heating months due to the fact that it take less energy to move the heat (outside->home->water) versus generating the heat outright. Another thing to thing about is when people think that people is solving the problem by just ducting the evaporator cold air outside. The problem is the air that you ducted outside will have to be replaced with air from somewhere (you cannot get too negative air pressure)... well, if you are in Midwest winter, the air outside is usually colder than the air that is coming out of the back of the GE water heater. Here is the DOE Energy Star analysis of water heaters. On page 9, there is a comparison table for various Electric heating technology. The HPWH wins in almost every category. http://www.energystar.gov/ia/partners/prod_development/new_specs... ******* Hope it helps... Here is a link that might be useful: fatwallet heat pump water heater...See Moreiggie
15 years agokjboggs
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