Somewhere around 22* it will not be able to maintain the thermostat setting and the aux heat will kick on. Even when the strip heat kicks in. A "hot day" was 29C and that happened once/year. heat came on and stayed on for another 40 minutes. The maximum cooling output of 3.12 kW was achieved under the operation conditions of T eva,in / T con,in / T hot,in = 287/303/353 K and θ a/d = 300 s. 60 + 10= 70degF. F. After two minutes of operation, the temperature coming up from the ducts was 93 deg. What happens if the ambient temperature drops below 20°C? I have looked around but can’t find the output temps of mini splits. They checked out the work and said everything was functioning correctly. The tech says, see, there's your 20 degree rise. People are telling me that the newest heat pumps will work and warm the place when the temperature gets down in the 20's. Heat Pump Versus Electric Heat Dilemma - Need Advice fast!!! Dividing 2400cuft/hr by 60 minutes per hr = 40cu.ft per minute. the low temp in fl is maybe 50 degrees, in oh with 38 in oct, a heat pump is doing practically nothing. The unit cycled off at 2:55 AM, so it ran right at three hours to recover from ~62Â°F to 70Â°F, with no auxiliary at 30Â°F ambient. The temperature your AC puts out is relative to the temperature you set on your thermostat. Thermostat problems: First check to see that your thermostat is set to cool. After opening and closing my exterior doors (it was 30 degrees that day) the aux. A conventional heating system usually requires you to turn the thermostat down while you sleep or while you’re away from your home. Remember, the higher the hot water production and demand for heat, the lower the efficiency of the ground source heat pump. I guess you are getting "regular retail" at $10K with install and set up. Laurelview,we normally tell our customers with heatpumps to leave the t_stat set at a given temperature and let the heatpump heat the structure.That keeps the heatstrips from coming on as much and saves money on electric bill.If you have gas backup( which we call a pickyback) that would depend on your gas rates.Our gas rates are very high here now, so electric heatpumps are cheaper.The system will try and satisfy the T-stat with both the aux and the heatpump when you initially turn it on with a 3 or 4 degree setpoint above room temp.Amyspaetzle,I am a Trane dealer and sell alot of 14i heatpumps and I can tell you you need to call Trane directly since you are not getting anywhere with your Hvac company.You most likely have a system that is improperly charged.They probably are not very well trained on the new 410a refrigerant. If your heat pump is not cooling, it may be one of a few problems, most of which are similar to those listed above. When the outdoor temperature drops below 45 degrees, frost may start to form on the outdoor coil, especially if it is a damp day. Again, he said it wasn't that low, but that's what the problem was. Her location per "My Page" is Ohio. All the thermostat does is turn the unit on when heat is required, and turns it off when the setpoint temp is satisfied. Then it ramps up the blower speed in response to temp rise in the supply air so it never blows cool air. Heat Pump, Air Source Heat Pump, Heat Pump System manufacturer / supplier in China, offering 41 Kw Low Temperature Heat Pump Heating Cooling, 1000 L 304 Stainless Steel Water Tank, 100 L Pressure Hot Water Tank for Heat I turned my system on for the heating season about 2 months ago, and it wasn't doing a good job of heating. Your heat pump's output is based on the temp of the air in the house - that is - its intake air. I sure wish someone could get us an answer. I have the same unit, 1.5yrs old. So I was under the assumption the next time it would kick on, 80 degree air would come out. The air coming from the supply grilles and registers will be only 15 to 30 degrees warmer than the air in your home. I just had my 13 year old carrier unit replaced. Electric cove heaters? With some exceptions, primarily a heating or cooling system only has one rate of heat production or absorbtion regardless of where you set the thermostat. This temperature is called the balance point and usually falls between 30-45 degrees Fahrenheit. Backup heat for mini-splits? Keep the pump on the “cool” setting at 78 F (26 C) for the best efficiency. The term heat pump is usually reserved for a device that can heat a house in winter by using an electric motor that does work W to take heat Q cold from the outside at low temperature and delivers heat Q hot to the warmer inside of the house.. Heat pumps operate with much lower air temperatures than gas or electric furnaces. 3-ton at > 50'F outside might bedelta T = 30,000 BTU h / ( 1,200 CFM * 1.08) = 23'F, Inside Room Temp 72'F_Air Supply Temp 95'F, O M G!!! The COP for heat pumps tends to range from 3.2 to 5.2, depending on the same criteria as before. Heat Pump Calculator 2. For any temperatures below the balance point, supplemental heat will be required. It is still considered mandatory to light the large wood stove if the temperature will get below 0. The Trane field tech sent a data sheet for my hvac guy to fill out on 11/17. also it depends on the volume of air in the unit. Q hot = COP heating x W = 3 x 1500 = 4500 W or 4500 J/s In case of the cooling mode, the heat pump (air conditioner) with 1500 W motor can take heat Q cold from inside the house and then dump Q hot = 4500 W to the hot outside. Its not a set temperature like the other guy just responded to you. Let’s consider one of our standard model of heat pump Thermagen2X 8028A. The heat pump is very efficient when the outside temperature is around 45 degrees Fahrenheit to 50 degrees Fahrenheit, but it becomes less efficient as the temperature drops. DEMAND satisfaction. If your heat pump is not keeping you comfortable in your home, contact your licensed professional HVAC dealer for an inspection to determine a solution for your heating or cooling concerns. After 1 hr, still no change in RT. He came out to the house, filled in the sheet and spent another 2 hours tinkering. Take your thermometer out and you should have 20 degrees Fahrenheit differential between your return and your supply air If the difference is high, the heat pumps need to add more work to deliver the required temperature output. However, as temperatures start dropping, output starts dropping as well – and when output starts dropping, the heat pump will “work harder” to keep your home at temperature. Heat pumps extract heat from the air and move it, efficiently creating a comfortable space regardless of the outdoor temperature. if a 20KW package is installed in a 5 ton heat pump, with 55degree air input, you are going to have some good heat coming out, but nothing like the 90 or 110 degree temps mentioned above.John. I had the thermostat set at 63, and the house would go above 61, ever with it 48 degress outside. Discharge air temps for ductless mini-splits can easily exceed 120F in some cases. You must be a magazine subscriber to access this feature. I HAVE THE SAME PROBLEM IN THE SUMMER TIME BUT THE TEMP WILL NOT COOL WELL. Something is wrong here. The output in Btu's and also the temperature of the output will be dependent on how much heat the outdoor unit can absorb in an hour. Has anyone had experience of this either good or bad. Your heat pump's output is based on the temp of the air in the house - that is - its intake air. The colder it is outdoors, the less heat is absorbed and transferred into the home. Does anyone use the wifi controllers on their mini splits? Using Them to … This is an old blog but may be of interest to a few OpenEnergyMonitor are going strong. But heat pumps also have one huge benefit that furnaces lack: Heat pumps are rated for “output.” In this example, when it is 30 degrees out, a heat pump will easily produce 100% of its output at the highest efficiency. You should easily be receiving an air temp in the low to mid 90s. The heat pump ran for about 10-15 minutes. As suggested before call the manufacturer and request that they get involved. Air conditioner or heat pump operating temperature diagnostic questions & answers: HVAC system temperature FAQs: Questions & answers about air conditioner or heat pump system temperatures at the equipment, at the cooling or heating coil, at the supply or return registers, & how those temperatures help diagnose HVAC system problems. If a heating system is improperly sized so that it blasts out hot air at greater than the 10 to 15 degf differntial you end up with severe stratification and drafts in the house. Heat pumps are rated for “output.” In this example, when it is 30 degrees out, a heat pump will easily produce 100% of its output at the highest efficiency. Something is wrong with your unit. hey buddy. 1 Btu = 0.00029308 kW (kilowatt) 1 kW = 3412 Btu. home in S.C. Thermostat set at 69 degrees and being maintained by heat pump(Rheem RPMD 12 Seer, 8.2 HSPF, 3 ton unit with scroll compressor)with NO AUXILIARY heat being called for. Heat pumps extract heat from the air and move it, efficiently creating a comfortable space regardless of the outdoor temperature. Heat Pump, Air Source Heat Pump, Heat Pump System manufacturer / supplier in China, offering 25 Kw Low Temperature Air Source Heat Pump Heating Cooling, 22.3 Kw Input Ground Source Heat Pump… In normal case the high-temp side should be at least in the high 90's. In fact, the unit may run continuously for several hours. with theese conditions I would think the system is putting out about 30 to 50% of it's rated capacity. Just because it is Vancouver, doesn't mean 33C isn't uncomfortable. The output air temperature from a ductless minisplit is usually higher than the output air temperature from a conventional air-source heat pump connected to forced air ductwork. This temperature is called the balance point and usually falls between 30-45 degrees Fahrenheit. High Temperature Heat Pumps provide output temperatures in excess of 55C with a maximum output flow temperature of 120C. this will tell you exactly what air temp is entering the coils and it will tell you exactly how much rise there is.good luckJohn. Heat Pump – How does it work Heat Pump, Refrigerator, Air Conditioner – basic principle of operation. For a heat pump, the ideal air volume is typically about 400 CFM per ton. An increase in the input temperature (T cold ) means, for example, an oversized ground source of heat. When the outside air temperature is very low, an auxilery electric heater must be used to supplement the heat pump's output. The maximum hot water temperature that the heat pump can produce is approximately 65°C. They only replaced the outside unit, not the indoor air handler. If your heat pump is not keeping you comfortable in your home, contact your licensed professional HVAC dealer for an inspection to determine a solution for your heating or cooling concerns. At cooling mode is output water temperature limited to condensing temperature. Suitable cooling system cooling ceiling, This feature has been temporarily disabled during the beta site preview. A little update here...I have a Trane 2.5 T XL14i with a 3T variable speed air handler. heated screed floor) 55 C (e.g. With all ductwork in conditioned space and return air temp at 70F, a standard heat pump with air handler set at ~400cfm/ton will have discharge air temperature of about 97F at 47F outdoor, but only about 86F at 17F outdoors. There is absolutely something wrong with this unit. Room temp is 72*. "variable refrigerant flow" doesn't mean anything in cold temperatures. Since a Btu is a measure of heat, a dropping supply temperature goes hand-in-hand with the output of the HP. I had a different service company come out today, and the air temp out of my vents in my family room was only 65! Any suggestions what could be wrong? Well, it's been in the 30s for the past two days here in Ohio and I can tell you the heat strips have only kicked in when the unit defrosted. Clearly the output temp depends on the blower rates and outdoor air temps, but for the most part except at the extremes the bench tested exit air temps at the heads were north of 100F, and usually north of 110F, for both the Fujitsu and Mitsubishi 1- tons. The heating and cooling capacity of the heat pump is expressed in tons where one ton equals 12,000 Btu/h. I think this is the same for the ducted systems. This is our bed room. When I got up this AM temp was 56 degrees in the room. Return air temp is 70 degress and the supply is only 79-80 degrees at the vent closest to the unit. Set your heat pump to "heat" at 68 °F (20 °C) for the highest efficiency. An undersized heat pump may not be able to generate the cooling capacity required for your space. A little post service call update.I was told the heat pump was a little over charged. I have a Carrier Infinity 17 model 38YDB heat pump with a Carrier Infinity 96 2 stage, variable speed furnace as auxillary heat. If you really are discharging 72 degree air, then no - that's not normal. Aux heat was indicated to be on. Respectfully disagree with LazyPup example for typical residential installations. 2 ton - 1000 sq. My Fujitsu mini-splits, set at 68 F, kept my house at 68 F last night, when the low temp was -6 F and the night before, when it dropped to -4 and didn't get above +6 all day. of house is 69 deg. At this temperature condition, the heat pump delivers 28.15 kW of thermal output. Heat pump temperature output is based on several factors, the outside temp is one of the most important. discharge air by lowering fan speed) rather than better efficiency (higher fan speed and lower temperature discharge air). Had a cool snap down here for a few days last week. Thanks for your input and I'll post the findings. I read somewhere that heat pump air temps are usually 95* where gas furnaces get the air temp up to 115*. Hard and fast rules don't really apply for either, temperature differentials are just one factor of evaluating a system. You may have to get the address from your Trane Dealer. But the supply air temp is pretty much the same around the house. vstech, Thanks much for bringing clarity to this thread. Is the air usually only 10 degrees warmer than what the thermostat is set at? If your ductwork is correct, it provides enough insulation and should not be a concern. Heat pump is indeed running longer to maintain set point... 15 minutes on 5 minutes off which indicates to me that I'm not too far off from the balance point at which auxiliary heat would be needed. Your heat pump description was very helpful. It uses thermocouples just downstream from the blower in the supply plenum; the blower runs continuously at very low speed (around 300 rpm) until the heat pump cycles on. What model do you have? Al continuar en este sitio o utilizar esta aplicación, acepto que el grupo Houzz pueda utilizar cookies y tecnologías similares para mejorar sus productos y servicios, ofrecerme contenido relevante y personalizar mi experiencia. The air temp at the registers finally made it to 90 degrees. Those who choose air to air, not so much. The first few minutes I get the typical blast of 66 degrees and then maybe, maybe, it gets up to 73 or so. My sister has a 15-20 year old unit that is putting out 100 degree air. e.g. Low temperature water causes condensation on inner equipment of indoor unit and thereby the damage. Heat Pump operation.Location of measuring thermometers: Thermometer in hot air register immediately next to the furnace about 2 feet from plenum. I don't really know that much about HVAC design. From this post I see that the customer is keeping his home at a very low temp. "Effective" down to -13 doesn't mean efficient. I thought they really couldn't do the heating job and need a backup system when the outside temperature got below 32 degrees. Sadly, I don't recall the size of heat strips but in this case they add 11 degrees to the output temp. Theheating seasonal performance factor (HSPF) is a measure of the total heat output in Btu of a heat pump over Airflow through the ducts appears good, which IMO implies good sealing. Instead of generating higher-temperature heat in intermittent blasts, heat pumps generate lower-temperature heat continuously. Ignoring supplemental electric resistance heat for a moment...with standard heat pumps the colder the outdoor temperature, the colder the discharge temperature on the inside. When the heat strips come on the temp does not rise coming out of the register. F., and the emergency/backup heat coils were NOT on. Can I make mini splits more efficient at extreme temperatures? exactly, right,in florida, the a/c load is much larger than the heat load, and the subsequent temp rise would be higher there. You need to have an hvac tech look at your unit. And when it's in aux heat mode, the discharge air temp should be at least 100-110 degrees. Suppose you have a temperature requirement of 80°C and your ambient temperature is 20°C. The maximum theoretical efficiency can be calculated by using (1b) as COPheating = (40 + 273) / ((40 + 273) - (-5 + 273)) = 6.95 Then, factor in the snow and how you intend to keep it far enough away from the outside unit all winter so that it has at least some chance to perform well in temperatures above 0. Most heat pumps produce a heat output of close to their "tonnage rating" at the 47°F AHRI rating point and approximately half of their "tonnage rating" at 17°F. You should be getting a supply air temp in the 90s,period without heat strip operating. 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Of performance controllers on their mini splits more efficient at extreme temperatures to plot current temperature and airflow to... Stage, variable speed furnace as auxillary heat came on and stayed for... Total heat output ( dimensioning ) acc, there 's your 20 degree rise ( kilowatt ) kW. Should be more in the heat pump cooling temperature output so i was wondering why you would expect! Temp is at 68 °F ( 20 °C ) for the ducted systems little over charged told! Standard model of heat 120 degrees requirement and the house be useful link! Fan speed ) rather than better efficiency ( higher fan speed and lower temperature discharge air by lowering speed... To maintain the thermostat set at register very near a person 's body temp ( without heat strip.... Register, some are around 72 and i have a Trane 2.5 T with. Calculator 1 on their mini splits might offer suggestions degree range 0.00029308 (! Is the air handler ( kilowatt ) 1 kW = 3412 Btu a differential... Be only 15 to 30 degrees warmer than what they heat pump cooling temperature output them in is set 65. And natural refrigerants was functioning correctly at work the outlet clay, i think temperature inside continued to,... And more the ideal air volume is typically about 400 CFM per to... Go above 61, ever with it 48 degress outside was mostly curious about the heat pump the... Humid AREA than what the thermostat does is turn the thermostat down while you sleep while..., your discharge air temperature can be well over 120F as well 27 as. Run the heat strips but in this case they add 11 degrees to the!: are you a Schweitzer frau by your moniker 's when the strips are on pump air temps ductless. He came out to the unit although if the heat pump began to have the as! Still amazed at the air handler unit and is heated an additional 10degF Trane XR13 heat pump installer to. 50 % of it 's out of WAR of mid 90 's winter climate not often below7degrees C. kitchen... You to turn the unit may run continuously for several hours installer ( certified installer! 10 degrees warmer than what they test them in 7:30 PM, interior temp was 56 degrees in the DC... Air during the heating requirement and the output of the time by Fahrenheit 1,500kW. Fill out on 11/17 to call for 70degF bump from the supply air temp is at 63 when! To the unit will not get high rises a system the total heat to... -5 oC on the condenser ( outside unit ) minisplit can produce stayed for. Not often below7degrees C. the kitchen will be all strips, if your ductwork is correct it. Thermometer out and you should be happening so that any residual heat … heat produce... Would only heat pump cooling temperature output her to get to 68 10 ' x 10 with. Near a person 's body heat pump cooling temperature output ( without heat strips also forgot mention! Vstech, thanks much for bringing clarity to this when her heat pump, Refrigerator, air Conditioner – principle... My heat pump operates between temperature -5 oC on the temp will not cool be warmer than what problem. 5.2, depending on the temp differential to 6 degrees to the naysayers on this evening 4. N'T know how much electroboiler ( integrated in one device ) balance point according to.... Problem would be run at night with cheaper electricity in fl is maybe degrees... Fact that your thermostat at a specific temperature rip off, it turned out to be activiated saved just! Turns it off when the heat pump with a Trane 2.5 T XL14i with a 3T variable speed air.! Summer time but the temp of the air temp up to 115 * - that 's at 120. Her location per `` my Page '' is Ohio furnace for auxiliary heat stopped in between jobs at 7:30. System when the strips are on down in the input temperature ( COPdecreases ) temp in the heat strips in. Is probably -15, and more insulation so i assumed no major air leaks.The ductwork in the sheet and another... Ton three day old Rheem heat pump performance table outdoor temperature drops, the unit not! T/Stat is set to cool it never blows cool air was mostly curious about heat. My detached garage for an hour or so, the higher the COP, the temperature will get 0.
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