Fireplace Heat Exchanger

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We are looking into purchasing a home with a Tempstar NUGM125EKA1 furnace. The home inspector said that this model of furnace is known to have problems with the heat exchanger cracking. If this is true, has the replacement exchanger been re-engineered to prevent this problem? Is there any way to tell if the previous owner had the exchanger upgraded already? I can't ask the previous owner because he is unavailable. What would an estimated heat exchanger replacement cost? Is this something that may happen or something that will happen? If hasnt happened yet does that mean this heat exchanger is a quot;goodquot; one and it wont happen? Thanks in advance.
Tempstar Heat Exchanger
i want to know if heating a house with basebooard heat will be more or less expensive than forced hot air.---both ran by natural gas power. i dont care about allergies.
It basically takes the same amount of Btus to heat your house to a comfotable level. HVAC companies use whats called a heat loss calculation to decide what size equipment it will require to heat your house. The same calculation is used for forced-air as for a boiler. So, if you're burning natural gas to create those Btus in your house, whether with a furnace or a boiler it doesn't really matter to the gas company-especially now that both types of equpment offer high-efficiency options. One thing you might consider is the up-front cost. Sometimes boiler systems cost more for a new system than forced-air systems, and if you buy a boiler- you still have to plan on air condtioning the house, which is done with forced-air also. Comfort is another (and final) factor to consider- some people prefer the way a boiler system heats as opposed to a forced-air system.
What the difference if the water passed through the shell and the hot air (with same inlet temperature and mass flow rate) are passed through the tubes ?
There might be some difference in the performance of the exchanger but the long term problem could be difficulty with fouling on the side from the water. The overall heat transfer coefficient could be affected by the differences in the velocity of the two fluids. The pressure drop could also be affected with the reversal of two fluids. It would take a rigorous calculation to determine the actual change in exchanger performance. Water is typically put on the tube side for ease of cleaning the tubes that can be fouled by deposits from the water impurities.
Hot water is to be used in a room heater, entering the heater at 80°C and leaving at 50°C, to maintain the air in the room at 20°C. To achieve this, the required heat transfer rate is 1.0 kW. The predicted overall heat transfer coefficient based on the outside area of the heater surface is 20 W m-2 K-1. Calculate the log mean temperature difference for heat transfer. Key in your answer with two significant figures.
The method I used to answer the question is as follows: Modelling the process as a counter current heat exchanger: water enters at 80 deg C and leaves at 50 deg C, air enters at 20 deg C and leaves at 20 deg C (no change in air temperature throughout due to heat loss to surroundings). dT1 = 80-20 = 60 deg C dT2 = 50-20 = 30 deg C dT(logmean) = (dT1-dT2)/ln(dT1/dT2) = 43.28 deg C = 43 deg C (2 s.f.) Alternatively: model the process as heat transfer from one bulk fluid to another, i.e. water to air. The bulk mean temperature of the water is Tbm = (80+50)/2 = 65 deg C Then Q = U*A*dT(logmean) = U*A*(Tbm - Tair) therefore, dT(logmean) = Tbm - Tair = 65-20 = 45 deg C
Can i use plate heat exchanger to cool down fermented yogurt (from 43 degree to 10)? I just worry it might block the heat exchanger. Please help. Thank you!
I heat my milk,and I use a bit of cream for mine, get it to blood temperature, take it off the heat, let it sit for 5 minutes then stir in 1 250ml plain Balkan style yougart (Canadian brand), pour into cups, and I have a plastic container, I place the cups in, top with a loose piece of plastic wrap, set this on top of the frig, and allow it to ferment overnight, i the morning I put the cups with there covers in the frig, the yougart culture has to work at a constant temperature to firm.
what is the amount of energy (heat or electricity) that comes from the Cogeneration or CHP ?
Without more details it is impossible to give specific quantities, so maybe you are asking about the proportions of heat vs electricity from a typical cogeneration plant. Cogeneration or Combined Heat/Power (CHP) plants typically use a gas turbine or sometimes a Stirling heat engine to drive an electric generator. A heat exchanger on the engine's exhaust recovers heat for space heating or water heating (the engine may also be water cooled). Such CHP's typically produce about 70-80% of their energy as heat, and 20-30% as electricity. So in terms of power a 100kW CHP will produce around 75kW of heat and 25kW of electricity.
I have quotes for replacement of A/C and Furnace, prices include tax and installation. All motors have variable speedFurnace:Rheem-Prestige Series 90, model RGFD 92%. with lifetime heat exchanger unit replacement warranty, 10 years on labor and parts, 90,000 BTU: $4200Lennox-G61V 94.3%, 90,000 BTU, lifetime warranty of heat exchanger, 10 year parts, 2 year labor: $3850Carrier-Infinity 96.6%, 100,000 BTU, lifetime warranty of heat exchanger, 5 year parts and labor: $4000A/C (3 tons)Amana-ASX14, 14 seer, 10 year part labor warranty, lifetime unit replacement on compressor: $3450Lennox-Elite Series XC14, 14 seer. 5 year part, 2 year labor and 10 year compressor warranty: $3150Carrier-comfort series, 14 seer. 5 year part and labor warranty, 10 year compressor warranty: $3500Which ones are the best choices of A/Cs and furnaces with the price and warranty that they offer. Thank you for your advices!!
I would purchase a Carrier unit. If it is using Puron, this will be the new refrigerant all are aiming towards. Carrier (which is made by the same company who makes Bryant) , in my opinion, is a far better brand than Rheem. Also, if these are all offered by different companies, please make sure the company you chose has been in business for a while. It's easy to start a company in this business as you will see many pop up in the summertime. After the rush, many cannot remain open due to the slow season.
An ideal gas is in contact with a heat reservoir so that it remains at a constant temperature of 100 K. The gas is compressed from a volume of 34 L to a volume of 17 L. During the process the mechanical device pushing the piston to compress the gas is found to expend 3 kJ of energy. What is the magnitude of the heat flow between the heat reservoir and the gas and in what direction does the heat flow occur?I honestly have no idea how to solve it. Please help!
Apply the first law of thermodynamics equation for heat (Q), work (W), and internal energy (U). Q = deltaU + W In an ideal gas, U is exclusively a function of temperature. Because the process is isothermal, U is constant. Therefore deltaU = 0. Note: this is only true if the process is quasistatic and frictionless, which means slow enough that the pressure can fully distribute at every point along the way. And our first law equation becomes: Q = W We are given the mechanical work done on the gas. Recall the sign convention for positive energy: Positive heat is heat added to the system Positive work is work done by the system Therefore W = -3 kJ Since Q = W Q = -3 kJ Result: 3 kJ of heat are transferred. Interpreting the negative sign this means that 3 kJ escape the system of gas and transfer to the thermal reservoir.