Questions tagged [heating-systems]

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Safely evaporate electrolyte from fragile porous substrate

We have porous ceramic platelets of ~50x5x1 mm³ thickness infiltrated with ammonium nitrate solution (NH4NO3). We want to decompose and evaporate it w/o damaging the fragile substrate (decomposition ...
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2k views

What is the gray-body emissivity value of air

Wonder if anyone would know what is the average thermal emissivity value of air relative to blackbody at near room temperatures? I am looking for that magical number between 0 and 1. Looked everywhere ...
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140 views

equivalent full hours of heating equipment

I would like to know if there is a standard way of calculating the equivalent to a capacity factor but for heating equipment. That is the ratio between the amount of heat delivered during one year ...
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41 views

How to solve power surge caused by curing oven PWM cycle?

I have a Despatch LBB 1-69 lab oven in my shop. It is a single-phase, 110-volt, 30-amp unit. It is wired to a 220 volt, 2-phase, 40-amp panel (on a single 110 volt phase), which is fed by the 100-amp ...
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2answers
85 views

is it possible to achieve 1000C temperature in a cabin?

is it possible that if i have a cabin which is insulated from outside but is built with some sort of material like copper and there is a heating element of sort which is providing 100C constantly but ...
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1answer
26 views

Where to output the colder air from a “heat-pump boiler”?

In an average family house, where should we let the colder air from a "heat-pump boiler" out? 1) - to the inside of the family house (ex.: heated in winter, so letting cold air in it..) 2) - to the ...
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2answers
37 views

How do I correctly model a building to determine effectiveness of a heat source?

The problem domain You have a shelter that you use in a cold climate, and you want to provide it with some heat to take the edge off the chill. You already have a structure in a location which gets ...
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1answer
636 views

Process fluid flow in a fired heater

While I’m studying about a fired heater (furnace) in chemical engineering , I learnt that the process fluids enters from the convection section and leaves at the radiant section of the furnace. Why ...
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1answer
71 views

Natural gas boiler Vs. Electric Heater efficiency

If a facility buys natural gas at 8 dollars/Mcf to provide heating from an 85% efficient natural gas boiler, what is the equivalent cost of electricity ($/kWh) for a 95% efficient electric heater? I'...
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2answers
82 views

The air conditioner mechanism

Why does chilled water emerge from the water pipe of air conditioner? I feel that instead, lukewarm water should come out, the reason being the air conditioner air from the room and also, electricity ...
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1answer
31 views

When heating a house, does the water flow slowly decrease as the difference in temperatures approaches 0?

So let's say you set your thermostat to 20 degrees centigrade, and the current room temperature is 10. A flow of water will gush into the radiators. What I'm wondering, is this flow constant the whole ...
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2answers
84 views

What is the cost of heating of a 60k sqm building to 27 degrees celsius vs 20 degrees celsius? [closed]

How can I calculate the cost of heating a building such as http://group.canarywharf.com/estate-building/5_north_colonnade/ ? Its size: 59,142 sq m / 636,600 sq ft The temperature is in many places ...
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2answers
173 views

Calculate efficiency of water heating

I have a heating system with which I heat up 10 liters of water by 24.2°C in 610 seconds. My system consumed 0.5 KW of electric energy in this time. Now I used this formula: Specific heat ...
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3answers
358 views

Energy transfer in a hot wire cutter?

I am using a nichrome wire for my project. Q.1. I want to know which source should I use as my voltage AC or DC? I know that the average power dissipated in a resistor in one cycle(in AC source) is ...
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1answer
68 views

Drilling PCB 3d printer bed

I need a heated surface for a project and was thinking of using one of these PCB heater beds. But I'd need to drill a few holes in it - can I do this without stopping it working? Thanks
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1answer
36 views

Heating hot air within a 2 inch tube

Background So I am working on a project to where I am trying to heat up air within a 2 inch tube, with high air flow. I am using 2 inch tri clamp stainless steel tubes where I basically have a fan ...
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1answer
94 views

Model of a domestic boiler

I have to design a model of a domestic boiler. I represent the boiler as a heat exchanger (HEX1), as shown in the figure. In many articles I have found that it is schematized with this equation: $$ ...
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2answers
125 views

Heat balance in a pipe flow network

I have 2 pipe lines, both water . that combine to heat up water. Assuming at steady state , Heat gained by cold water = heat lost by hot water Let's say , according to formula , I calculated the ...
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1answer
126 views

Why does the Ultimaker 3D Printer has a Heater + Heater transfer plate (aluminium) + Glass?

Why does the Ultimaker 3D Printer has a Heater + Heater transfer plate (aluminium) + Glass? I wonder why a glass plate, and if is possible to remove the glass and print directly in the aluminium ...
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1answer
129 views

Lifting 250 watts of heat using some heat exchanger/heat sink [closed]

I am new to thermal management. I want to lift about 250 W of heat from hot end of thermoelectric cooler/peltier cooler (TEC). The temperature of hot side of TEC is 30°C. I want to use some ...
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28 views

Determine Heating costs in $/kWh for a specific location

Suppose I wanted to find the average heating price for a specific location in the US, where: heating_price: The price of equivalent unit energy intensity of heating energy source (e.g. natural gas), ...
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28 views

What should length of copper coil be to heat fluid from Temp A to Temp B?

I'm building a milk pasteuriser. The milk in the cooling tank has a starting temperature of 4°C. It should then be heated to 72°C for 30 sec, then cooled back down again to 4°C as ...
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10 views

How to connect to heating networks both with sources and consumers into one network?

We need to connect two distinct heating networks on a wastewater treatment plant into one. So far I've only seen heating networks with one central heat source or one central manifold that all heat ...
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3answers
85 views

Steam cycle for a boiler / radiator system vs Rankine cycle

Everything I've read on the Rankine cycle indicates that the feedwater pump is necessary for the cycle to work. However the steam cycle used in traditional household boiler / radiator systems seems to ...
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0answers
22 views

Are there any books which show how to design electrical coil heat exchangers?

I need to design an electrically powered gas heater, but i need to do so in detail. I'm looking for a guide similar to the shell and tube heat exchanger design guide in coulson and richardson's ...
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22 views

How to build multiple large scale fish tanks with water at different temperatures

I am wondering at a high level what are the material components that might be used in building several large scale fish tanks that are temperature regulated like on a fishing farm. For example, what ...
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39 views

Can radiant induction heat thermally decompose wood

Is it possible to thermally decompose an indicator like wood in a induction heating container made of stainless steel if the induction frequency is low enough to heat the container about 1000°c. ...
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2answers
64 views

Calculating geothermal heat pump

So I need to calculate how big geothermal heat pumps I need for a building. Heat pump is used for heating and to heat used water. If I know how many kW's are needed for heating the building and the ...
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2answers
127 views

Thermal oil in Boiler not reaching desired temperature

The thermal oil Feroline U in Boiler is not gaining the desired temp of 240 Degrees. We have physically measured the temp using digital thermometer at a distance of 20 cm where the boiler temp sensor ...
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1answer
57 views

Problem finding temperature gain of air through heated glass tube

I have a 20 cm long glass tube of outer diameter 6.4 mm and inner diameter 4.3 mm. Air at ...
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1answer
44 views

Makeup Air Gas Burner

I often select makeup air handling units for buildings using Greenheck's CAPS tool. When selecting a model, you first select the unit based on your airflow needs. Then it will provide some choices for ...
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2answers
52 views

Why isn't heat pump used for heating for most case

Heat pump cost 2-4 times lesser of energy to heat than non-heat pump heater, then why are non-heat pump heater still very common ? (1) At home, boiler and water radiator is used. (2) For district ...
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1answer
40 views

Heating tape that has leads like picture below

Does anyone know where I can find Heating tape that has these same leads or know what they are called? It is meant to be plugged into the second picture attatched.
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1answer
45 views

Why does a Gulf Coast campus need an active steam network?

The other day, some restauraunts in the union were closed "due to steam outage." I had seen the venting of course, but had thought little about why the school has a steam system. As best I can find, ...

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