чем лечить стоматит у ребёнка в домашних условиях
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чем лечить стоматит у ребёнка в домашних условиях, Visualizing mini-split performance data - GreenBuildingAdvisor, Mount outdoor unit on the wall or on the ground? - GreenBuildingAdvisor, Mini split for a dusty workshop? - GreenBuildingAdvisor, Surge Protection for Heat Pumps - GreenBuildingAdvisor, Minisplit: Leave it on or turn it off? - GreenBuildingAdvisor, Air-source heat pump / Minisplits with humidification , Fresh air with heat pump or minisplit - GreenBuildingAdvisor.
I’ve been digging through Mitsubishi M-Series performance data for a project I’m working on. I made some graphs of the capacity and efficiency of these ductless mini-split heat pumps. I figured I’d share the graphs here, since many GBA community members are interested in mini-splits. Take-aways 1. Capacity and efficiency depend on the indoor and outdoor air temperatures. (See graphs #1 and #2.) 2. Efficiency also depends on how hard the heat pump is working. Efficiency degrades at very low load, when the heat pump starts cycling off and on rather than modulating continuously, and at very high load. (See graph #3.) 3. Maximum capacity is significantly higher than rated capacity. For heating, maximum capacity is typically 150% to 185% of rated capacity; for cooling, 110% to 150%. (See graph #4.) 4. Minimum capacity varies by model. For heating, minimum capacity is typically 15% to 30% of rated capacity; for cooling, 20% to 40%. (See graph #5.) Terminology By capacity, I mean output thermal power (in kBTU/h). By coefficient of performance (COP), I mean the ratio of output thermal power (converted from kBTU/h to kW) to input electrical power (in kW). COP is a dimensionless quantity. By nameplate capacity and COP, I mean the capacity and COP that the manufacturer reports at the specific test conditions of 60 F indoor/47 F outdoor (for heating) and 80 F indoor/95 F outdoor (for cooling). By rated capacity, I mean the capacity measured at given indoor/outdoor temperatures. Rated capacity is less than maximum capacity. By rated COP, I mean the COP measured at rated capacity at given temperatures. Rated COP is usually the highest COP the heat pump achieves at given temperatures. In other words, rated capacity is an efficiency ‘sweet spot’. Data sources The primary source is Mitsubishi’s reported performance data, pulled from their 2019 submittals, their longer technical specifications, and/or the NEEP “Cold-climate air-source heat pump specification product listing” spreadsheet. This data is for the 6, 9, 12 and 15 kBTU/h Hyper-Heating models. I focused on this manufacturer and product line mainly because the M-Series is popular, efficient, and known to heat well in cold climates. (Also to keep the project size manageable.) I sanity-checked against Jon Winkler’s 2011 report, “Laboratory test report for Fujitsu 12RLS and Mitsubishi FE12NA mini-split heat pumps”, and various real-world monitoring studies (Roth et al. 2013, Faesy et al. 2014, Ueno et al. 2015, Williamson et al. 2015, Korn et al. 2016, Sutherland et al. 2016). I can share data or link to these studies on request. Caveat There isn’t much empirical data on COP while cycling at very low load. The best information I could find was from Winkler 2011, who found in two heating experiments that the 12 kBTU/h model’s COP degraded by 10 to 37% when it started cycling. The lines below 20% capacity in graph #3 are not precise. I’d love to see more data on this. , Data sources The primary source is Mitsubishi’s reported performance data, pulled from their 2019 submittals, their longer technical specifications, and/or the NEEP “Cold-climate air-source heat pump specification product listing” spreadsheet. This data is for the 6, 9, 12 and 15 kBTU/h Hyper-Heating models., I am close to installing 3 fujitsu mini split units at our home under construction. Two outdoor units will be installed near each other, with the third installed in a different area of the house. The HVAC installer asked if I wanted to mount them on the wall or on the ground. I can't decide which I would prefer. Any thoughts on the pros and cons of each? I live in central KY, zone 4A. We don't .
A heat pump cooling system or electric heat can help to heat an area faster if that's an issue for you with hydronic. Cooling, as far as I know, requires air movement and so dust becomes a problem., Fortunately, it’s easy and inexpensive to add surge protection to a heat-pump system. This article reviews causes of power surges, explains how surge-protection devices work, and discusses installation, service, and sales of HVAC surge protectors. Causes of power surges Residential heat pumps typically operate at an incoming voltage of 230−240V. Power surges are transient spikes during , Very well insulated home. Nudura ICF Walls (2.5" EPS x 6" concrete x 2.5" EPS) with R-40 roof, 3" slab insulation, R7 windows, Zone 4 climate at 5,000 feet elevation. Under 800 sqft of conditioned space and I have a 1 ton ductless Mitsubishi mini-split heat pump (23 SEER). TURNED OFF: At 7am the interior temp is 68F and by 6PM the interior temp is 74F. Outside temps in the 92F-98F during the , Anyone know of any Air Source Heat Pumps with Mini Splits (ductless) that have integrated Humidification that can be controlled to set levels?, Since the existing ductwork is in the attic, I’m going to abandon it and either add new ductwork to the basement with a heat pump / air handler, or use a minisplit (or two). Both contractors recommended two minisplits due to needing 5-7 heads (3 bedrooms, kitchen / dining are open, living room; potentially basement and mud room). 4., I'm interested in feedback on what must be a common dilemma with mini splits - where to place the indoor head unit when the best location for aesthetics, function, proximity to the outdoor condenser unit, and gravity condensate draining are often in conflict with each other. I'm most interested in opinions about how much weight to put on a location that will not require a condensate pump .