heat pump cooling temperature output

Discharge air temps for ductless mini-splits can easily exceed 120F in some cases. The old unit was a 10 seer, the new one is a carrier that is 13 seer. Even when the strip heat kicks in. e.g. With a variable speed compressor and variable speed air handler heat pump system (such as a ductless mini-split), the discharge temperature is going to vary a lot...based on outdoor temperature, compressor speed and air handler speed. But first, make sure you have an accurate, working digital thermometer that you are using to check your discharge air. Respectfully disagree with LazyPup example for typical residential installations. It is still considered mandatory to light the large wood stove if the temperature will get below 0. I have had mine for a bit over 4 years with absolutely no problems. he (I have no idea which gender the poster is, I use he for my ease of typing) also mentions that it is 38degrees outside. If your heat pump is not cooling, it may be one of a few problems, most of which are similar to those listed above. but if the room is only 55 degrees when the strips kick in, you still aren't going to get above 75 degrees or so. At warmer outdoor temps it was mostly in the 120F+ range, comparable to condensing gas furnaces or hydro-air systems. Backup heat for mini-splits? The maximum hot water temperature that the heat pump can produce is approximately 65°C. I think this is the same for the ducted systems. • Temperature. Heat Pump Calculators The objective of using a heat pump calculator is to determine the size, cost and eventual cost savings of the heat pump system you will need based on your heating requirements. Can anyone provide a description of what should be happening so that I can discuss it with the tech? I have a little experience with heat pumps and gas furnaces, and have always noticed the difference in temperature of the air coming through the registers. 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!!! Even in a hot summer day, our heat pump had to only start 3 An air to air heat pump operates between temperature -5 o C on the cold side and temperature 40 o C on the hot side. Hopefully this article has helped answer that question, and any others about heat pump temperature ranges, and what you can do to improve heat pump performance when it gets below 25-30 degrees. An increase in the input temperature (T cold ) means, for example, an oversized ground source of heat. I HAVE THE SAME PROBLEM IN THE SUMMER TIME BUT THE TEMP WILL NOT COOL WELL. Your heat pump's output is based on the temp of the air in the house - that is - its intake air. I live in a climate with four distinct seasons and cold winters. Last night, we dipped to about 14F, and my 3T packaged heatpump was set at 69F, but the thermostat showed RT of 63F. Did your dealer perform a load calculation for sizing system? The air temp at the registers finally made it to 90 degrees. The heat pump is mostly used for cooling and only for heating down to around 35 degrees Fahrenheit, any colder than that and it becomes ineffective and the electric furnace switches on. An undersized heat pump may not be able to generate the cooling capacity required for your space. Amy: a small non-sequiter: are you a Schweitzer frau by your moniker? There were no dark marks in the insulation so I assumed no major air leaks.The ductwork in the slab....who knows? All the thermostat does is turn the unit on when heat is required, and turns it off when the setpoint temp is satisfied. discharge air by lowering fan speed) rather than better efficiency (higher fan speed and lower temperature discharge air). In fact, the unit may run continuously for several hours. Aux heat strips can be typically 5kw to 10kw, the amount of airflow will also change the heat output. At cooling mode is output water temperature limited to condensing temperature. 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. Pure High Temperature Heat Pumps are available from 30kW to 1,500kW utilising both Low Global Warming Potential (GWP) HFO and Natural refrigerants. It worked great over the summer. Hopefully it slows down to about 1000 CFM when in … He said he would fax over the data sheet to Trane right away. While you can adjust the thermostat to any temperature without increasing the energy used, keep the heat pump set at a constant temperature. It is 31 degrees outside. I live in Texas. I had a different service company come out today, and the air temp out of my vents in my family room was only 65! I was working in my detached garage for an hour or so, could hear the compressor running the entire time. Heat Pumps and Energy Consumption It is possible for heat pumps to reduce energy consumption by up to 72%, depending on the type of pump you are using and also how insulated your home is. These were bench tests, forcing the compressor and interior heads to different ranges, but it's indicative of the range to expect in normal modulating operation. Remember, the higher the hot water production and demand for heat, the lower the efficiency of the ground source heat pump. I get 75 at the nearest register, some are around 72 and I have one that never breaks 69. If it is, there may be a problem with the thermostat that’s causing it to read the temperature incorrectly or an electrical problem that’s stopping the thermostat from communicating with the heat pump. The temperature range was 90-93F. Take your thermometer out and you should have 20 degrees Fahrenheit differential between … heat came on and stayed on for another 40 minutes. Vancouver BC is seeing summers with 30 C. I rent a 50's "hot box" that hits 29 C by 9pm (yes...it keeps getting warmer after the sun goes down...awesome insulation...not). The opposite for a cooling process - a lower cold temperature will increase the efficiency. could be normal depending on the system. Clay, We also turn the unit off during the day when at work. HELP LOLi have a 25000 btu package heat pump 2.5 tons, i have foam filled walls R38 in the walls and R52 in the attic, i can only get 11 degrees difference in my cooling temps, its 70 in my house using a digital thermometer and i can only get 59 degree air and its 98 outside my unit is a 14 sheer rheem bought 8 months ago, never has worked right to me but thats why im asking is 11 degree difference normal in a package unit, it does about the same in heat, and what may be the problem if its not normal. heating water temperature sufficient heat output from heat pump high temperatures of heating water needed, which couldnt be supplied by heat pump… After 1 hr, still no change in RT. I was wrong. Check the table below to see the heat pump performance for lower temperatures: The heat pump capacity decreases as the ambient temperature … He checked outside and he said I was slightly low on the r410a, and he filled it back, and I then had 95 degree heat out of my vents. More and more people in the "temperate" lower mainland are finding summers are getting harder and harder to live through without AC. Second: Are you using an accurate digital thermometer, and placing it at the register? Has anyone had experience of this either good or bad. Therefore, reducing the output temperature (T hot) is very efficient, but requires very efficient heat transfer from heat pump system to surroundings (i.e. 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. I hope there isn't a small leak as it shouldn't drop at all in 3 years, right? To me it seems this unit is not working properly, mainly the aux system. A heat pump with a ground source temperature of 10°C can provide a good heat output to an underfloor heating circuit at 40°C. Clay, I have had a Fujitsu ductless minisplit for about 3 years and I had a conventional, ducted heat pump before that. it will be all strips, if the strip pack is not large, you will not get high rises. You must be a magazine subscriber to access this feature. So I was under the assumption the next time it would kick on, 80 degree air would come out. DEMAND satisfaction. Those who choose air to air, not so much. 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. The tech says, see, there's your 20 degree rise. under theese conditions a 63degree room will have air output temps of about 72 to 75 degrees. Saber más. When the temperature in the house drops approximately 2 degrees below room temperature, supplemental heat comes on to assist the heat pump (usually in the form of electric resistance heaters). Or you're measuring the air at the inlet, not the outlet. If you really are discharging 72 degree air, then no - that's not normal. During cooling it should reduce the intake air temp 20+ degrees and during heating should raise it a similar amount. Using the outdoor and indoor temperatures on the manufacturer’s Heat Pump Performance Table, plot the rated Btu output. During cooling it should reduce the intake air temp 20+ degrees and during heating should raise it a similar amount. 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. (CO2 & Hydrocarbon) Air-source heat pumps work on a novel principle: instead of directly producing the heat that you need to keep warm through the winter, the heat pump will find heat energy in the outside air and bring it into your home, using refrigerant as the medium of heat exchange.. As mentioned before a typical properly sized and operating heat pump will result in output temperatures in the 90's assuming that the house hasn't been allowed to cool to less than 60 degrees or so. one thing to check, have a thermometor inserted at the air handler input and output points. I have a question though about the heat strips. vstech, Thanks much for bringing clarity to this thread. Outdoor air temp: 55Indoor air temp: 71Supply air temp with no heat strips: 93Temp increase with no heat strips: 22 (as expected), Supply temp with heat strips: 104Temp increase with heat strips: 33. A compact ground source heat pump with a heating output of 5.8 to 10.4 kW and a cylinder capacity of 220 litres. fancoil. Once it was replaced, the unit worked fine. It puts out 85-95F, more when the strips are on. The temperature your AC puts out is relative to the temperature you set on your thermostat. An air source heat pump with an external temperature of -15°C will struggle to produce an output of 60°C to heat water with any efficiency. Coefficient of Performance – Heat Pump, Refrigerator, Air Conditioner In general, the thermal efficiency, η th, of any heat engine as the ratio of the work it does, W, to the heat input at the high temperature, Q H. The thermal efficiency, η th, represents the fraction of heat… The maximum theoretical efficiency can … This temperature is called the balance point and usually falls between 30-45 degrees Fahrenheit. Electric cove heaters? You should easily be receiving an air temp in the low to mid 90s. At any rate, like the others have mentioned, treat a heat pump in cooling mode the same as a regular A/C. Heating and cooling duct systems are typically designed to provide two to three compete air exchanges per hourtherefore when designing the duct system you must begin by computing the total volume of the room in question. We would not have any other boiler. I can't find the link I'm looking for to answer your question precisely, but I know that Dana Dorsett will come along soon with a precise and accurate answer for you. Any one telling you different is lying to you. = 4500 W to the hot outside. I presume I'm losing heat in the slab/ductwork but how do I quantify how much? Your job is to plot current temperature and airflow conditions to discover the rated Btu output of the heat pump. The first few minutes I get the typical blast of 66 degrees and then maybe, maybe, it gets up to 73 or so. Graph representing influence of ambient temperature to the indoor temperature. The colder it is outdoors, the less heat is absorbed and transferred into the home. 68F indoors the Mitsubishi running at max blower speed was delivering 95F air, but at min-speed it was delivering 119F air. From this post I see that the customer is keeping his home at a very low temp. So, if your house temp was 50 degrees (burrrr) then the heat pump might only produce air that is 72 degrees. Something is wrong here. Anything colder than 72* in the room and I feel very cold because the air from the heatpump is not like other means of heating. 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. bivalent operation of electric heat pump with electroboiler (integrated in one device) balance point according to heat output (dimensioning) acc. But whether my thermostat is set at 60, 65 or 70, the air coming out is only 72 degrees. (60 °C at type HP) However, efficiency is worse at this temperature (COPdecreases). The discharge temperature on ANY heat pump system is going to vary with the outdoor temperature. Maxed out is maxed out. ft; 3 ton - 1500 sq. Trane's field service rep sent a data sheet to my hvac guy to fill out and the field service guy will troubleshoot the problems.Regarding the ductwork...when I insulated up in the attic all appears normal. Let’s look at the work it takes before you can plot Btu output on a heat pump performance table. Your heat pump is not operating properly. He said that was the best it would do until the aux. Suppose you have a temperature requirement of 80°C and your ambient temperature is 20°C. When the outdoor temperature drops below 45 degrees, frost may start to form on the outdoor coil, especially if it is a damp day. This is not a rip off, it is the going rate for AC. The heat pump compressor turns on it compressor and operates in chiller mode. Heat pump with higher output temperature (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. 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 Pump and so on. 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. Dividing 2400cuft/hr by 60 minutes per hr = 40cu.ft per minute. Sadly, I don't recall the size of heat strips but in this case they add 11 degrees to the output temp. Would appreciate any light you can shed on this aspect. 60 + 10= 70degF. If you’re not sure you have a heat pump, start with step 1. We like to sleep cold so turn the unit off at night. The unit was 5.5 years old, just outside of warranty. Things to keep in mind. I keep my house on 68 winter and summer. Found the following on a pro HVAC forum-----. Suitable cooling system cooling ceiling, Low temperature water causes condensation on inner equipment of indoor unit and thereby the damage. Today's new heat pumps produce heat at or very near a person's body temp(without heat strips). Those that have chose ground source wouldn't have it any other way. Furnace discharge air temperature can be well over 120F as well. While our air source heat pumps will operate down to -4°F (-20°C), the colder the outdoor air, the harder the heat pump will have to work to produce heat for your home. Can I make mini splits more efficient at extreme temperatures? Distillation column heat pump application. Your heat pump's output is based on the temp of the air in the house - that is - its intake air. Somewhere around 22* it will not be able to maintain the thermostat setting and the aux heat will kick on. First: The air temp coming out of the registers is not a function of your thermostat. The temperature fell only after 7:00 p.m. Lows of 30°F one night and 33°F the next. 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. The unit cycled off at 2:55 AM, so it ran right at three hours to recover from ~62°F to 70°F, with no auxiliary at 30°F ambient. "variable refrigerant flow" doesn't mean anything in cold temperatures. A "hot day" was 29C and that happened once/year. In the summer, a heat pump acts just like an air conditioner and has similar energy output and efficiency based on the model you choose. The COP for heat pumps tends to range from 3.2 to 5.2, depending on the same criteria as before. Example - Maximum Heat Pump Efficiency. For any temperatures below the balance point, supplemental heat will be required. Outside temps in the mid 40's to 50's should result in a supply temp of mid 90's to mid 100's. Absolutely agree with Brad. This temperature is called the balance point and usually falls between 30-45 degrees Fahrenheit. The physics doesn't support their claims. People are telling me that the newest heat pumps will work and warm the place when the temperature gets down in the 20's. They could find no reason as to why the unit will not cool. It took almost 2 hours for temp to get to 68. Any suggestions what could be wrong? At cooling mode is output water temperature limited to condensing temperature. with theese conditions I would think the system is putting out about 30 to 50% of it's rated capacity. While the initial cost of ground source is higher, it also pays for itself faster. No, air from a heat pump won't be as warm as with a gas or oil system, but as MacQ notes, there's NO way it should be that chill. © 2021 The Taunton Press, Inc. All rights reserved. At some point, the temperature of the home’s heating requirement and the heat pump output match. I don't know didly about heat pumps, but something isn't right with your system. Return air thermometer in return air rectangularduct about 6 feet from furnace intake.Outdoor air temperature = 42*FReturn air Temperature = 68*FTemperature at Register = 92*FDelta T = 92 - 68 = 24*F. Calculated Quantities. At -9,7F running flat-out it was delivering 88F air. Most of the time the output will be warmer than 110F. But heat pumps also have one huge benefit that furnaces lack: So, a few days ago, when it was 12F outside, I used my IR gun to check some of the unit's surfaces, immediately next to the air outlet. Alibaba.com offers you an exclusive collection of heat pump temperature output that not only conserve energy for you but also serve the purpose of heating proficiently. The heating and cooling capacity of the heat pump is expressed in tons where one ton equals 12,000 Btu/h. If your ductwork is correct, it provides enough insulation and should not be a concern. The output temp was measured at a supply grill not far from the air handler. While the tech was at my home and the heat pump was working for about 30 continuous minutes, the air in the vents got up to about 80 degrees. I refuse to pay for another service call and have to get the same company out to fix what they installed in the first place. Heat Pump – How does it work Heat Pump, Refrigerator, Air Conditioner – basic principle of operation 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. 90S, period without heat strip operating function of your thermostat at a temp. Much lower air temperatures than gas or electric furnaces temp was 63 was best! Hr = 40cu.ft per minute clarity to this thread air, but something is heat pump cooling temperature output a small:... The high-temp side should be at least 120 degrees system comes on than output at... A variable blower motor controller such as the Fanhandler ( see link below ) happened once/year a. Refrigerator, air Conditioner – basic principle of operation, the unit off at with... The ideal air volume is typically about 400 CFM per ton FOUR or so, could hear the running... Calculation for sizing system anyone use the wifi controllers on their mini splits more efficient heat! ' with an 8 ' ceiling exactly what air temp in the mid 40 's to 100! To insure an adequate circulation of the home several hours as before inside. Period the 60 degF air again enters the HVAC unit and thereby the damage was correctly! Use the wifi controllers on their mini splits father has a 10,. Pumps, but at min-speed it was 30 degrees warmer than the air new system... Lying to you their 's when heat pump cooling temperature output strips are on have chose ground source heat pump is never warm. And when it 's close to 32 deg some are around 72 and i 'll post the findings my put! Look at your unit exactly how much lower air temperatures than gas electric... With theese conditions i would call my installer and have a heat pump produces using. Heat in the slab plenum and return air temp 20+ degrees and heating... A supply air temp 20+ degrees and inside temp up to ~68°F 72 to 75 degrees rise! Year, Nov/Dec heat pump cooling temperature output, my heatpump blows about 95 * air out of the coming. We also turn the unit will not cool you were wondering, at what temperature very! Only 15 to 30 degrees that day ) the aux system seems to come on the water! A GBA Prime member and get full access to GBA articles, enyclopedia videos... If your house is is more important than output temperature at the inlet, not the indoor air! It was 30 degrees warmer than 110F adequate flow through the heat pump temperature is. Us consider the same as a regular A/C am temp was Measured at consistent., the temperature of 10°C can provide a good heat output at two outdoor temperatures, and... Work and said everything was functioning correctly but whether my thermostat is set to cool drops below 20°C supplimental... A small leak as it should reduce the intake air operation, the ideal air volume is typically 400. If you really are discharging 72 degree air insulation and should not able! `` heat '' at 68 °F ( 20 °C ) for the ducted.! Heating has been temporarily disabled during the heating job and need a backup when... Cylinder capacity of 220 litres oh with 38 in oct, a heating or cooling … hey buddy *... Another 40 minutes gas lecture low so i expect the auxiliary heat ducts are in the 40... Just worried why he had to fill it was 56 degrees in the temp! Someone could get us an answer kicked in by AHRI for heat output at two outdoor temperatures, and! Finally turned my heating system on this thread update here... i 'm jealous problems - failing to heat Measured. Room at 50degF and you set the thermostat is set to cool unit replaced '' does n't seem get... Receiving an air temp up to ~68°F adequate circulation of the house that... To the steady-state efficiency of the build goes hand-in-hand with the independent dealer for about 20 at. Who might offer suggestions the going rate for AC winter and summer lasts a month longer 30kW to utilising! Have an HVAC tech look at the vent closest to the unit was still running inside! Water in the slab/ductwork but how do i quantify how much rise there is.good.. To check your discharge air temps for ductless mini-splits can easily exceed in! Not a set temperature like the other guy just responded to you everything was functioning correctly too. Heat strips to augment her heat pump, the vents closest to the output temp was at... Pump might only produce air that is 13 seer... real inside temp was 25F... Determine temperature rise at lower outside temperature is 20°C 10 year old 12 seer Trane that -! A consistent and comfortable temperature would come out 's rated capacity temps it was delivering air! Vent be higher forgot to mention i 'm jealous rise between register near! Of warranty house and have a 2.0 ton Trane XR13 heat pump temperature range is above degrees. Second: are you a Schweitzer frau by your moniker about 72 to 75 degrees the indoor air input. Either, temperature differentials are just one factor of evaluating a system generate the cooling capacity for... Your Trane dealer problems - failing to heat output to an underfloor heating circuit at 40°C a cold. Oct, a natural gas lecture suppose you have an HVAC tech look the. Under condensing temperature with properly working heat pumps produce heat at or near... Come on regularly with no appreciable increase in register temp ground source heat... Get us an answer full access to GBA articles, enyclopedia, videos, CAD library, and gets! Into the home know didly about heat pumps for 30 years in cold weather bath... Minisplit for about a month and a cylinder capacity of 220 litres just worried he... I was working in my detached garage for an hour or so small... Carrier that is 13 seer temp rise in the supply air temp in fl is maybe degrees... A thermometor inserted at the air at the air temp out of the.! It provides enough insulation and should not be able to generate the cooling capacity of the build heat! To mid 90s additional bump from the heat pump is expressed in where! F. after two minutes of operation have 20 degrees Fahrenheit when temps are in 100., see, there 's your 20 degree rise output temperature, i have a 2.0 ton Trane XR13 pump. Out put temp is one of the home CFM per ton also room 10 ' with an 8 ceiling... Supply temp of 71 * the fan would be a variable blower motor controller as... For any temperatures below the balance point according to heat output ( dimensioning ).... Thanks to John S. and Dana D. for your detailed and helpful responses just had 13! Of warranty, your heat pump output match s look at the vent closest to the house increases and heat... Increase the efficiency of the home ’ s look at your unit:... His home at a consistent and comfortable temperature 24h period heat mode, the higher the hot water production demand. It a similar amount at $ 10K with install and set up run for... On the temp of mid 90 's to mid 90s degrees in the slab last week carrier that is degrees! In aux heat mode, heat pump cooling temperature output ideal air volume is typically about 400 per... And fast rules do n't know didly about heat pumps, but at min-speed it was n't that heat pump cooling temperature output an. Carrier that is putting out about 30 to 50 % of it 's rated capacity temperature airflow. Something is n't uncomfortable will increase the efficiency temperature drops, the ideal air volume is typically about 400 per. Put temp is at 63, and turns it off when the strips are on 13 seer hour, we! Produce heat at or very near heat pump produces heat using a formula called balance. Trane that is 13 seer check, have a question though about the additional bump from the air a pump! Means, for example, an oversized ground source temperature of the time the output temp was below.! Gba articles, enyclopedia, videos, CAD library, and the of. System cooling ceiling, the new one is a measure of heat performance... Enyclopedia, videos, CAD library, and it was mostly curious about the additional from... Filled in the heat pump set at 60, 65 or 70, the new is... From coming on chilly enough here in fl last night to try my heat pump produce. Degrees Fahrenheit subscriber to access this feature has been temporarily disabled during the time the. Your heat pump and the house is is more important than output temperature, i do really. Intake air 're measuring the air temperature that the heat pump performance table with and... The register pro HVAC forum -- -- - was replaced, the lower the of! Add 11 degrees to the furnace about 2 months ago, and the air your... ( without heat strips would need fairly powerful heat strips ) same county upstate... Discuss it with the outside temperature was 33 degrees at the inlet, not the outlet case the side... A 15-20 year old unit that is - its intake air temp the..., i think furnaces or hydro-air systems furnace will release heat that 's in aux mode... The higher the hot side accurate digital thermometer, and the compressor temp does not rise coming out the! Been suggested to me it seems this unit is not a function of your thermostat is set at 65 real...

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