Questions tagged [heating-systems]

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1answer
59 views

Is it better to heat a heat pump evaporator or the load directly?

I have a heat pump which moves heat from outside to inside. I also have a solar heating array that collects radiant heat from the sun. Given that my goal is to heat the inside (with minimal energy ...
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2answers
359 views

How to make water go into my house, from a lake without energy?

Basically, I'm thinking about a system, that filtrates, and makes a lake's water drinkable, drives water into my house's faucets without electricity, and all these should be able to work when it is -...
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2answers
122 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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2answers
84 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 ...
3
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2answers
118 views

Winding a wire heating element after a few uses

I bought recently 10 meters of Kanthal A1 AWG18 wire, which is a type of heating element (FeCrAl alloy). I intend to make a coil out of it, but it's no use doing that right now, I need more of it for ...
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2answers
39 views

Control power to a tungsten filament?

I'm afraid I'm completely out of my depth here. I would like to use a tungsten filament to radiatively heat something near to it (in vacuum). My issue is I cannot figure out the easiest and/or ...
0
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1answer
70 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'...
0
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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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0answers
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 ...
0
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1answer
43 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 ...
0
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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 ...
0
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1answer
125 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 ...
2
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0answers
84 views

Why does a radiator valve require more torque after a few turns?

I'm automating a non-thermostatic household radiator valve, by replacing the knob with a DC motor and adding some support structure. You can see the system at work here: https://www.instagram.com/p/...
0
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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 ...
4
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1answer
206 views

How to deal with thermal expansion in a city wide heating system?

How to deal with thermal expansion in a city wide heating system? Background: As part of the program to combat pollution in and around Beijing, my adopted city of Zhuozhou (population, over half ...
0
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1answer
128 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 ...
1
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1answer
71 views

Have there been successful attempts at using a computer's heat to warm something up? [duplicate]

Computers get hot. So usually we try to make them less hot. But what if instead of trying to cool down a computer we used that heat for something else? Not necessarily any thing big like a whole ...
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0answers
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 ...
1
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1answer
623 views

How does the Italian Percolator work?

This morning, as with every morning, I had my coffee. However, today it was burnt, because I slightly overfilled the water. I use an Italian Percolator on a gas top. Normally, you put it on to boil, ...
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2answers
156 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 ...
4
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3answers
151 views

Controlling the temperature with high precision

I need to control the temperature with high precision, and for this task would be good a temperature controller with pt-100 sensor, something like this one PID Temperature Controller ITC-100. As I see ...
4
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1answer
746 views

Heat pump driven by a Stirling engine that requires no external work

I was considering some theoretical limits on transferring heat from one system at to another to another. It is well known that if you have two systems at temperatures $T_1$ and $T_2$, respectively, ...
1
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1answer
195 views

Heating circuit - help me understand control scheme of return temperature

I'm looking at a P&ID of a heating circuit. The burner/boiler is non-modulating. Red is flow/hot, blue is return/cold. AFAIK the pump is fixed speed (no FI). As far as I understand the control ...
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3answers
351 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 ...
6
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2answers
181 views

Is it a problem to have two heat sources controlled for different temperatures on the same heating circuit?

This is the situation - I have three heat sources, called CHP, burner 1 and burner 2 on the same circuit. All three feed to the same heating manifold, with various heat demands. Preferably I want to ...
4
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2answers
81 views

What surface temperature (rise) is required to (dis)qualify a combustion appliance from obtaining a “zero clearance to combustibles” rating?

How far must the surface temperature of a UL-listed combustion appliance rise to prohibit the manufacturer from specifying it for a zero clearance to combustibles installation? (I looked in UL 127 ...
8
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2answers
209 views

Heating circuit: Galvanized steel with press fitting vs welded steel pipes

What are the downsides for galvanized steel pipes + press fittings vs. welded steel pipes in a heating application? Diameter would be DN25/1". Background: The customer specifies only steel, only ...
3
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2answers
60 views

At what (outside) temperatures is it efficient to run my windowbox heat pump?

I am an electrical engineer that took two semesters of Thermodynamics about 4 decades ago. I am aware of the theory behind the Carnot cycle and such. I live in a condo in the Boston area that is all-...
4
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2answers
101 views

Analog PID controller - settings wrt $V_{err}$ - setpoint always higher than room temp

I designed from scratch an analog PID controller to mantain a temperature selected in the range of 60 to 80ºC with a room temp say = 20ºC. The "plant" is a simple 4R7 5 W resistor heated by a PWM-...
2
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1answer
430 views

Hydraulic switch vs heat exchanger

In a heating circuit, there's two (known to me) ways to decouple primary flow (through heat source) and the secondary flows (to consumers): a hydraulic switch in the heating manifold complete ...

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