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Funding in the millions for cutting-edge research in the field of heating and cooling technology: DFG establishes new research unit under the leadership of Chemnitz University of Technology

Heat pumps can, among other things, heat as well as cool living spaces and are also more climate-friendly when operated with renewable energies such as…

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Heat pumps can, among other things, heat as well as cool living spaces and are also more climate-friendly when operated with renewable energies such as photovoltaics, compared to, for example, gas heating systems. Against the background of climate change, heat pumps offer technological and ecological advantages. Currently, however, the energy efficiency of heat pumps cannot yet be fully optimized. This is mainly due to the fact that the behavior of the typical oil-refrigerant mixtures in the compressor of a heat pump is thus far not fully understood thermodynamically.

Credit: Chemnitz University of Technology

Heat pumps can, among other things, heat as well as cool living spaces and are also more climate-friendly when operated with renewable energies such as photovoltaics, compared to, for example, gas heating systems. Against the background of climate change, heat pumps offer technological and ecological advantages. Currently, however, the energy efficiency of heat pumps cannot yet be fully optimized. This is mainly due to the fact that the behavior of the typical oil-refrigerant mixtures in the compressor of a heat pump is thus far not fully understood thermodynamically.

The scientists of the new research unit 5595 “Oil-refrigerant multiphase flows in gaps with moving boundaries – Novel microscopic and macroscopic approaches for experiment, modeling and simulation” (short: “Archimedes”), funded with around four million euros by the German Research Foundation (DFG), want to change that now. The result should, among other things, be a new calculation model for designing compressors, which in turn can significantly improve the energy efficiency of heat pumps and refrigeration machines. The spokesperson of the new DFG research group is Professor Markus Richter, head of the Professorship of Technical Thermodynamics at Chemnitz University of Technology, with around 1.1 million euros of the total funding allocated to it.

“I am very pleased about the establishment of the DFG research group ‘Archimedes’ under the leadership of Chemnitz University of Technology – and thus the second research group at the Faculty of Mechanical Engineering. I congratulate Professor Richter and all other participants on this great success for the Faculty of Mechanical Engineering and our entire university. I would also like to express my heartfelt thanks to all those involved for their outstanding commitment. Without a doubt, the research unit will significantly contribute to strengthening the profile of our university as well as its external appeal”, says the rector of Chemnitz University of Technology, Professor Gerd Strohmeier.

“The behavior of a mixture of lubricating oil and refrigerant – such as the natural refrigerants propane or CO2 – in the compressor of a heat pump or refrigeration machine is a particular challenge for thermo- and fluid dynamics. Factors such as pressure and temperature change the thermophysical behavior and thus the flow behavior, which ultimately has an influence on the heating or cooling performance. For oil-refrigerant mixtures, we will precisely determine the thermophysical properties for the first time in this fundamental research project and, based on this, develop simple applicable equations of state as well as models for viscosity and thermal conductivity. This is an important building block to optimize heat pumps”, explains Professor Markus Richter.

“To develop a comparatively simple calculation model for the flow behavior of oil-refrigerant mixtures in gaps of compressors, we need precise information about how these fluid mixtures behave thermodynamically. The actual gap flow is then examined in a generic experiment of a rotating contour in a cylindrical glass housing. Here, we characterize the flow behavior on a macroscopic level with laser-optical methods and on a microscopic level with high-resolution numerical simulations”, adds co-spokesperson Professor Andreas Brümmer, head of the Chair of Fluidics at TU Dortmund.

The research work is scheduled to begin in the first quarter of 2024. In addition to Chemnitz University of Technology and TU Dortmund, TU Dresden, Friedrich-Alexander-Universität Erlangen-Nürnberg, Karlsruhe Institute of Technology, Ruhr University Bochum, and RWTH Aachen University are involved in the research unit “Archimedes”.

For further information, please contact Prof. Markus Richter, Tel. +49 (0)371 531-39331, E-Mail m.richter@mb.tu-chemnitz.de.

Keyword: DFG research groups at Chemnitz University of Technology

In addition to the now newly approved research group “Archimedes”, since 2021 the DFG has established the following research groups under the leadership of Chemnitz University of Technology:

• RG “Printed & stable organic photovoltaics from non-fullerene acceptors – POPULAR”

Spokesperson: Prof. Dr. Carsten Deibel, head of the Professorship of Optics and Photonics of Condensed Matter

• RG “Functional surfaces through adiabatic high-speed processes: Microstructure, mechanisms and model development – FUNDAM³ENT”

Spokesperson: Prof. Dr. Thomas Lampke, head of the Professorship of Materials and Surface Engineering

• RG “Proximity-induced correlation effects in low-dimensional systems”

Spokesperson: Prof. Dr. Christoph Tegenkamp, head of the Professorship of Solid Surfaces Analysis

Keyword: DFG research groups

Research groups funded by the DFG enable scientists to dedicate themselves to current and pressing issues in their fields and to establish innovative working directions. Currently, the DFG is funding 238 research groups nationwide, 16 clinical research groups, and 21 collegiate research groups.


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Homes listed for sale in early June sell for $7,700 more

New Zillow research suggests the spring home shopping season may see a second wave this summer if mortgage rates fall
The post Homes listed for sale in…

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  • A Zillow analysis of 2023 home sales finds homes listed in the first two weeks of June sold for 2.3% more. 
  • The best time to list a home for sale is a month later than it was in 2019, likely driven by mortgage rates.
  • The best time to list can be as early as the second half of February in San Francisco, and as late as the first half of July in New York and Philadelphia. 

Spring home sellers looking to maximize their sale price may want to wait it out and list their home for sale in the first half of June. A new Zillow® analysis of 2023 sales found that homes listed in the first two weeks of June sold for 2.3% more, a $7,700 boost on a typical U.S. home.  

The best time to list consistently had been early May in the years leading up to the pandemic. The shift to June suggests mortgage rates are strongly influencing demand on top of the usual seasonality that brings buyers to the market in the spring. This home-shopping season is poised to follow a similar pattern as that in 2023, with the potential for a second wave if the Federal Reserve lowers interest rates midyear or later. 

The 2.3% sale price premium registered last June followed the first spring in more than 15 years with mortgage rates over 6% on a 30-year fixed-rate loan. The high rates put home buyers on the back foot, and as rates continued upward through May, they were still reassessing and less likely to bid boldly. In June, however, rates pulled back a little from 6.79% to 6.67%, which likely presented an opportunity for determined buyers heading into summer. More buyers understood their market position and could afford to transact, boosting competition and sale prices.

The old logic was that sellers could earn a premium by listing in late spring, when search activity hit its peak. Now, with persistently low inventory, mortgage rate fluctuations make their own seasonality. First-time home buyers who are on the edge of qualifying for a home loan may dip in and out of the market, depending on what’s happening with rates. It is almost certain the Federal Reserve will push back any interest-rate cuts to mid-2024 at the earliest. If mortgage rates follow, that could bring another surge of buyers later this year.

Mortgage rates have been impacting affordability and sale prices since they began rising rapidly two years ago. In 2022, sellers nationwide saw the highest sale premium when they listed their home in late March, right before rates barreled past 5% and continued climbing. 

Zillow’s research finds the best time to list can vary widely by metropolitan area. In 2023, it was as early as the second half of February in San Francisco, and as late as the first half of July in New York. Thirty of the top 35 largest metro areas saw for-sale listings command the highest sale prices between May and early July last year. 

Zillow also found a wide range in the sale price premiums associated with homes listed during those peak periods. At the hottest time of the year in San Jose, homes sold for 5.5% more, a $88,000 boost on a typical home. Meanwhile, homes in San Antonio sold for 1.9% more during that same time period.  

 

Metropolitan Area Best Time to List Price Premium Dollar Boost
United States First half of June 2.3% $7,700
New York, NY First half of July 2.4% $15,500
Los Angeles, CA First half of May 4.1% $39,300
Chicago, IL First half of June 2.8% $8,800
Dallas, TX First half of June 2.5% $9,200
Houston, TX Second half of April 2.0% $6,200
Washington, DC Second half of June 2.2% $12,700
Philadelphia, PA First half of July 2.4% $8,200
Miami, FL First half of June 2.3% $12,900
Atlanta, GA Second half of June 2.3% $8,700
Boston, MA Second half of May 3.5% $23,600
Phoenix, AZ First half of June 3.2% $14,700
San Francisco, CA Second half of February 4.2% $50,300
Riverside, CA First half of May 2.7% $15,600
Detroit, MI First half of July 3.3% $7,900
Seattle, WA First half of June 4.3% $31,500
Minneapolis, MN Second half of May 3.7% $13,400
San Diego, CA Second half of April 3.1% $29,600
Tampa, FL Second half of June 2.1% $8,000
Denver, CO Second half of May 2.9% $16,900
Baltimore, MD First half of July 2.2% $8,200
St. Louis, MO First half of June 2.9% $7,000
Orlando, FL First half of June 2.2% $8,700
Charlotte, NC Second half of May 3.0% $11,000
San Antonio, TX First half of June 1.9% $5,400
Portland, OR Second half of April 2.6% $14,300
Sacramento, CA First half of June 3.2% $17,900
Pittsburgh, PA Second half of June 2.3% $4,700
Cincinnati, OH Second half of April 2.7% $7,500
Austin, TX Second half of May 2.8% $12,600
Las Vegas, NV First half of June 3.4% $14,600
Kansas City, MO Second half of May 2.5% $7,300
Columbus, OH Second half of June 3.3% $10,400
Indianapolis, IN First half of July 3.0% $8,100
Cleveland, OH First half of July  3.4% $7,400
San Jose, CA First half of June 5.5% $88,400

 

The post Homes listed for sale in early June sell for $7,700 more appeared first on Zillow Research.

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February Employment Situation

By Paul Gomme and Peter Rupert The establishment data from the BLS showed a 275,000 increase in payroll employment for February, outpacing the 230,000…

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By Paul Gomme and Peter Rupert

The establishment data from the BLS showed a 275,000 increase in payroll employment for February, outpacing the 230,000 average over the previous 12 months. The payroll data for January and December were revised down by a total of 167,000. The private sector added 223,000 new jobs, the largest gain since May of last year.

Temporary help services employment continues a steep decline after a sharp post-pandemic rise.

Average hours of work increased from 34.2 to 34.3. The increase, along with the 223,000 private employment increase led to a hefty increase in total hours of 5.6% at an annualized rate, also the largest increase since May of last year.

The establishment report, once again, beat “expectations;” the WSJ survey of economists was 198,000. Other than the downward revisions, mentioned above, another bit of negative news was a smallish increase in wage growth, from $34.52 to $34.57.

The household survey shows that the labor force increased 150,000, a drop in employment of 184,000 and an increase in the number of unemployed persons of 334,000. The labor force participation rate held steady at 62.5, the employment to population ratio decreased from 60.2 to 60.1 and the unemployment rate increased from 3.66 to 3.86. Remember that the unemployment rate is the number of unemployed relative to the labor force (the number employed plus the number unemployed). Consequently, the unemployment rate can go up if the number of unemployed rises holding fixed the labor force, or if the labor force shrinks holding the number unemployed unchanged. An increase in the unemployment rate is not necessarily a bad thing: it may reflect a strong labor market drawing “marginally attached” individuals from outside the labor force. Indeed, there was a 96,000 decline in those workers.

Earlier in the week, the BLS announced JOLTS (Job Openings and Labor Turnover Survey) data for January. There isn’t much to report here as the job openings changed little at 8.9 million, the number of hires and total separations were little changed at 5.7 million and 5.3 million, respectively.

As has been the case for the last couple of years, the number of job openings remains higher than the number of unemployed persons.

Also earlier in the week the BLS announced that productivity increased 3.2% in the 4th quarter with output rising 3.5% and hours of work rising 0.3%.

The bottom line is that the labor market continues its surprisingly (to some) strong performance, once again proving stronger than many had expected. This strength makes it difficult to justify any interest rate cuts soon, particularly given the recent inflation spike.

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Mortgage rates fall as labor market normalizes

Jobless claims show an expanding economy. We will only be in a recession once jobless claims exceed 323,000 on a four-week moving average.

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Everyone was waiting to see if this week’s jobs report would send mortgage rates higher, which is what happened last month. Instead, the 10-year yield had a muted response after the headline number beat estimates, but we have negative job revisions from previous months. The Federal Reserve’s fear of wage growth spiraling out of control hasn’t materialized for over two years now and the unemployment rate ticked up to 3.9%. For now, we can say the labor market isn’t tight anymore, but it’s also not breaking.

The key labor data line in this expansion is the weekly jobless claims report. Jobless claims show an expanding economy that has not lost jobs yet. We will only be in a recession once jobless claims exceed 323,000 on a four-week moving average.

From the Fed: In the week ended March 2, initial claims for unemployment insurance benefits were flat, at 217,000. The four-week moving average declined slightly by 750, to 212,250


Below is an explanation of how we got here with the labor market, which all started during COVID-19.

1. I wrote the COVID-19 recovery model on April 7, 2020, and retired it on Dec. 9, 2020. By that time, the upfront recovery phase was done, and I needed to model out when we would get the jobs lost back.

2. Early in the labor market recovery, when we saw weaker job reports, I doubled and tripled down on my assertion that job openings would get to 10 million in this recovery. Job openings rose as high as to 12 million and are currently over 9 million. Even with the massive miss on a job report in May 2021, I didn’t waver.

Currently, the jobs openings, quit percentage and hires data are below pre-COVID-19 levels, which means the labor market isn’t as tight as it once was, and this is why the employment cost index has been slowing data to move along the quits percentage.  

2-US_Job_Quits_Rate-1-2

3. I wrote that we should get back all the jobs lost to COVID-19 by September of 2022. At the time this would be a speedy labor market recovery, and it happened on schedule, too

Total employment data

4. This is the key one for right now: If COVID-19 hadn’t happened, we would have between 157 million and 159 million jobs today, which would have been in line with the job growth rate in February 2020. Today, we are at 157,808,000. This is important because job growth should be cooling down now. We are more in line with where the labor market should be when averaging 140K-165K monthly. So for now, the fact that we aren’t trending between 140K-165K means we still have a bit more recovery kick left before we get down to those levels. 




From BLS: Total nonfarm payroll employment rose by 275,000 in February, and the unemployment rate increased to 3.9 percent, the U.S. Bureau of Labor Statistics reported today. Job gains occurred in health care, in government, in food services and drinking places, in social assistance, and in transportation and warehousing.

Here are the jobs that were created and lost in the previous month:

IMG_5092

In this jobs report, the unemployment rate for education levels looks like this:

  • Less than a high school diploma: 6.1%
  • High school graduate and no college: 4.2%
  • Some college or associate degree: 3.1%
  • Bachelor’s degree or higher: 2.2%
IMG_5093_320f22

Today’s report has continued the trend of the labor data beating my expectations, only because I am looking for the jobs data to slow down to a level of 140K-165K, which hasn’t happened yet. I wouldn’t categorize the labor market as being tight anymore because of the quits ratio and the hires data in the job openings report. This also shows itself in the employment cost index as well. These are key data lines for the Fed and the reason we are going to see three rate cuts this year.

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