There are many thermal energy sources in our surroundings, including geotherm, air heat, waste water heat and sewage heat.
With the drive for making effective use of such heat sources going full steam ahead, researchers of the Natural Energy Institute under the State Academy of Sciences established a geothermal heating system of using underground water with a temperature of 4℃ and put it into practice.
Based on an analysis of the process of thermal balance between refrigerant and water in an evaporator, they guaranteed the safety of geothermal equipment by applying a method of controlling the amount of water.
They also developed an operation method of directly applying underground water of low temperature without using freeze-proof liquid.
This method makes it possible to use surface water of river, lake and sea with a temperature of 4 to 5℃ as thermal energy sources and ensure that a room is air-conditioned in summer.
Offices in those units which have introduced the method are fully provided with the heating.
More From Naenara (En)
Aleksandr Lukashenko, president of the Republic of Belarus, on an official visit to the Democratic People’s Republic of Korea,
March 26, 2026
Aleksandr Lukashenko, president of the Republic of Belarus, on an official visit to the Democratic People’s Republic of Korea,
Forests provide the people with raw materials and food and help increase agricultural productivity and protect river basin. They
March 26, 2026
Forests provide the people with raw materials and food and help increase agricultural productivity and protect river basin. They
A research team at Kim Il Sung University has developed a titanium carbide-based metal-ceramic cutting tool conducive to the
March 26, 2026
A research team at Kim Il Sung University has developed a titanium carbide-based metal-ceramic cutting tool conducive to the
The respected Comrade Kim Jong Un sent a wreath to the bier of Ri Pyong Sam, former advisor to the Political Bureau of the then
March 26, 2026
The respected Comrade Kim Jong Un sent a wreath to the bier of Ri Pyong Sam, former advisor to the Political Bureau of the then
The respected Comrade Kim Jong Un sent a reply message to Vladimir Vladimirovich Putin, president of the Russian Federation, on
March 26, 2026
The respected Comrade Kim Jong Un sent a reply message to Vladimir Vladimirovich Putin, president of the Russian Federation, on
The Korean people are now making great efforts to attain the ambitious goal set forth by the Ninth Congress of the Workers’
March 26, 2026
The Korean people are now making great efforts to attain the ambitious goal set forth by the Ninth Congress of the Workers’
The Workers’ Party of Korea intends to rebuild the country’s public health on an advanced basis and radically develop it so
March 26, 2026
The Workers’ Party of Korea intends to rebuild the country’s public health on an advanced basis and radically develop it so
The 34th April Spring Friendship Art Festival is to be held in Pyongyang on the occasion of the 114th birth anniversary of
March 26, 2026
The 34th April Spring Friendship Art Festival is to be held in Pyongyang on the occasion of the 114th birth anniversary of
To pay an official visit to the DPRK at the invitation of Comrade Kim Jong Un , president of the State Affairs of the Democratic
March 26, 2026
To pay an official visit to the DPRK at the invitation of Comrade Kim Jong Un , president of the State Affairs of the Democratic
At the invitation of Kim Jong Un , president of the State Affairs of the Democratic People’s Republic of Korea, Aleksandr
March 25, 2026
At the invitation of Kim Jong Un , president of the State Affairs of the Democratic People’s Republic of Korea, Aleksandr
The Sangwon Cement Complex, a DPRK’s giant cement producer, is boosting production as never before. The Sangwon Limestone Mine
March 25, 2026
The Sangwon Cement Complex, a DPRK’s giant cement producer, is boosting production as never before. The Sangwon Limestone Mine
Sea Chilbo is part of Mt Chilbo, a celebrated mountain in the DPRK famous for its beautiful and distinctive scenery.The area of Se
March 25, 2026
Sea Chilbo is part of Mt Chilbo, a celebrated mountain in the DPRK famous for its beautiful and distinctive scenery.The area of Se
Among the national intangible cultural heritage items of the DPRK are legends of Ulji Mun Dok, a patriotic general in the period
March 25, 2026
Among the national intangible cultural heritage items of the DPRK are legends of Ulji Mun Dok, a patriotic general in the period
The scallop-harvesting season has started in the Sinpho City Offshore Farm, which was built as a model of offshore farming on the
March 25, 2026
The scallop-harvesting season has started in the Sinpho City Offshore Farm, which was built as a model of offshore farming on the
Kim Jong Un , general secretary of the Workers’ Party of Korea and president of the State Affairs of the Democratic People’s
March 25, 2026
Kim Jong Un , general secretary of the Workers’ Party of Korea and president of the State Affairs of the Democratic People’s
Medical workers of the Breast Tumour Institute of the Pyongyang Maternity Hospital offer field service at the lowest curative and
March 25, 2026
Medical workers of the Breast Tumour Institute of the Pyongyang Maternity Hospital offer field service at the lowest curative and
The DPRK is proactively working to cope with disastrous abnormal weather in its effort to protect state and public wealth and
March 24, 2026
The DPRK is proactively working to cope with disastrous abnormal weather in its effort to protect state and public wealth and
One day in May 1998, Chairman Kim Jong Il was on his field guidance trip in Changdo County of Kangwon Province before he suddenly
March 24, 2026
One day in May 1998, Chairman Kim Jong Il was on his field guidance trip in Changdo County of Kangwon Province before he suddenly
A pagoda called Saja (lion) is located at the Kumjang Hermitage in the Naegumgang-ri, Kumgang County, Kangwon Province. The
March 24, 2026
A pagoda called Saja (lion) is located at the Kumjang Hermitage in the Naegumgang-ri, Kumgang County, Kangwon Province. The
Some foreigners who have been to the DPRK advise their fellows: “If you want to visit Pyongyang, I recommend you should apply for
March 24, 2026
Some foreigners who have been to the DPRK advise their fellows: “If you want to visit Pyongyang, I recommend you should apply for
More Articles