Hi everyone,

What is desuperheater ? how it is useful in cooling system?

Anybody knows about this?

Thanks,

Payal Nene

+91 - 20 - 24 321 770

http://www.maniks.com/

Tags: desuperheater, heater, water

Views: 248

Reply to This

Replies to This Discussion

A desuperheater in the context you're referring to is an add-on (secondary) heat exchanger that transfers otherwise wasted heat from an air conditioner's hot gas line to a storage water heater. It requires expert installation skills and additional plumbing between outdoor unit and storage tank. It provides "free" hot water. Whether or not it may save more than it costs depends on climate, building cooling load and local energy prices.

In order to get full benefit of a desuperheater, a buffer tank is necessary. Otherwise, the primary water heater will maintain its temperature independently, which reduces or eliminates heat transfer from the desuperheater (capacity is proportional to the temperature difference between the water and the refrigerant, and the water flow rate). Also, a circulator pump is necessary. Otherwise, heat transfer would only happen when hot water draws coincide with A/C cycles. The cost of the desuperheater, pump and buffer tank, plus installation makes it difficult to justify.

Desuperheaters fell out of favor after the conversion to R410a refrigerant but are still offered as factory installed options by many ground source heat pump manufacturers.

Hi Sir,

Thanks for your response.

The students I taught in my HVAC classes always seemed to have a hard time understanding what Superheat is and a greater difficulty applying the processes involved. I always returned to the basics to explain this concept. The following may clear up any questions regarding Superheat.

Taking water, at atmospheric pressures, we need to raise the temperature of the water to 100 deg. C (212 deg. F) to achieve its boiling point. Heating liquid water to its boiling point uses “Sensible Heat” or that heat applied that can be measured with a normal thermometer. Notice that when we add Sensible Heat, the water stays in its (liquid) state or phase, but its actual temperature rises.
When this water’s boiling point is reached, the water goes through a change of state with the addition of heat energy…converting liquid water to steam. During this water phase change, liquid water is converted into water vapor - steam (water in a gaseous form). The added heat to accomplish this is called Latent Heat. The addition of Latent Heat involves a change in the state of matter. In this case liquid water is changing its state to a gas and does so keeping the temperature of the process constant.

Going back to our example, liquid water at its boiling point is at 100 deg. C (212 deg. F) at atmospheric pressures. While the state is changing from liquid to gas, the temperature remains the same. When the change of the state of the water is completed, the temperature of the water vapor (steam) is 100 deg. C. (212 deg. F). If processes require this steam temperature to increase to 110 deg. C (230 deg. F.) Sensible Heat needs to be added.

Increasing the temperatures of matter beyond their boiling point is called SuperHeat.

RSS

Forum Discussions

Mini split installation location

Started by Jan Green in HVAC. Last reply by David Butler 21 hours ago. 1 Reply

Mini split air conditioners and ceiling fans

Started by Beverly Lerch in General Forum. Last reply by David Butler yesterday. 11 Replies

Tankless water heating and existing gas lines

Started by Julie Saporito in HVAC. Last reply by Kent Browning on Friday. 5 Replies

Whole House Fans - Love 'Em or Not?

Started by Tom Conlon in General Forum. Last reply by John White Sep 10. 77 Replies

Latest Activity

David Byrnes's video was featured

Why One Room Is Hotter Than Others

Ever wonder if your air conditioner is working right because one room never gets a cool or warm as others? Do you need a bigger air conditioner to fix a room...
6 hours ago
Profile IconEric MacCallum, Adam Morgan and Caolan Hutchens joined Home Energy Pros Forum
20 hours ago
David Butler replied to Jan Green's discussion Mini split installation location
"Really hard to advise without knowing the layout. But you're asking good questions. Any chance…"
21 hours ago
Jan Green posted a discussion

Mini split installation location

Reaching out to the experts today to ask about location of installation of a mini split.  I'm a…See More
22 hours ago
David Butler replied to Beverly Lerch's discussion Mini split air conditioners and ceiling fans
"Among the various opinions expressed here, I offer a few 'truths'... Ceiling fans are…"
yesterday
Walter Ahlgrim replied to Beverly Lerch's discussion Mini split air conditioners and ceiling fans
"This is one of thouse topic where you ask 10 people and get 12 different opinions. I will give you…"
yesterday
Brett Little's event was featured
Thumbnail

Full Circle Urban Forestry: Introducing Urban Wood Opportunities - Free CE Webinar at Webinar Online

October 17, 2018 from 12pm to 1:15pm
Many common urban tree removal practices in the United States view felled urban trees as costly…See More
yesterday
Beverly Lerch replied to Beverly Lerch's discussion Mini split air conditioners and ceiling fans
"Now I am confused.  Everyone has a different opinion.  "
yesterday
Joseph Novella replied to Beverly Lerch's discussion Mini split air conditioners and ceiling fans
"Don't use the fans! They generate heat and mix the stratified high warm air with the low cool…"
yesterday
John White replied to Beverly Lerch's discussion Mini split air conditioners and ceiling fans
"If you are using air conditioning, a ceiling fan will allow you to raise the thermostat setting…"
yesterday
John White posted a blog post
yesterday
Profile IconDana Launius and Susan Dee Cummins joined Home Energy Pros Forum
yesterday
Linda Wigington liked Don Fugler's discussion Depressurization/make-up air issues
Sunday
Profile IconCourteney Hazard, Erin Kelly, Megan Bailey and 3 more joined Home Energy Pros Forum
Friday
Kent Browning replied to Julie Saporito's discussion Tankless water heating and existing gas lines
"First the problems - increased CO due to poor combustion, flue condensation delayed ignition, etc.…"
Friday
Brett Little posted an event
Thumbnail

Full Circle Urban Forestry: Introducing Urban Wood Opportunities - Free CE Webinar at Webinar Online

October 17, 2018 from 12pm to 1:15pm
Many common urban tree removal practices in the United States view felled urban trees as costly…See More
Friday
Hannah Finch's blog post was featured

Announcing National Energy Geek Day [October 6]

If you know anything about EnergyLogic, you are probably aware that we are fun loving and…See More
Friday
John White commented on Corbett Lunsford's video
Thumbnail

5 Types of Ventilation for Controlling Your HOMEChem

"Ventilation is one of the single most important element of an HVAC system. It is generally used to…"
Friday
Profile IconDevin Cecere, John Cooper, Beth Burrell and 1 more joined Home Energy Pros Forum
Thursday
Brett Little commented on Jim Gunshinan's blog post More "Buzz" from ACEEE Summer Study—Builder-Installed Electric Loads
"Ive got one of those stupid street lights! When I bought the house I was like how do you shut…"
Thursday

Photos

  • Add Photos
  • View All

© 2018   Created by Home Performance Coalition (HPC)   Powered by

Badges  |  Report an Issue  |  Terms of Service