skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Heat transfer system

Abstract

A heat transfer system for a nuclear reactor is described. Heat transfer is accomplished within a sealed vapor chamber which is substantially evacuated prior to use. A heat transfer medium, which is liquid at the design operating temperatures, transfers heat from tubes interposed in the reactor primary loop to spaced tubes connected to a steam line for power generation purposes. Heat transfer is accomplished by a two-phase liquid-vapor-liquid process as used in heat pipes. Condensible gases are removed from the vapor chamber through a vertical extension in open communication with the chamber interior.

Publication Date:
OSTI Identifier:
6620861
Assignee:
Dept. of Energy TIC; ERA-06-012381; EDB-81-038697
DOE Contract Number:
AT(45-1)-2170
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; HEAT EXCHANGERS; STEAM GENERATORS; REACTOR COMPONENTS; BOILERS; VAPOR GENERATORS 220200* -- Nuclear Reactor Technology-- Components & Accessories

Citation Formats

Not Available. Heat transfer system. United States: N. p., 1980. Web.
Not Available. Heat transfer system. United States.
Not Available. 1980. "Heat transfer system". United States. doi:.
@article{osti_6620861,
title = {Heat transfer system},
author = {Not Available},
abstractNote = {A heat transfer system for a nuclear reactor is described. Heat transfer is accomplished within a sealed vapor chamber which is substantially evacuated prior to use. A heat transfer medium, which is liquid at the design operating temperatures, transfers heat from tubes interposed in the reactor primary loop to spaced tubes connected to a steam line for power generation purposes. Heat transfer is accomplished by a two-phase liquid-vapor-liquid process as used in heat pipes. Condensible gases are removed from the vapor chamber through a vertical extension in open communication with the chamber interior.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1980,
month = 3
}
  • A method is given for restricting the mass transfer of Fe crystals to the cold zone of a liquid Pb and/or Bi heat transfer system. The method comprises suspending Mo powder in the heat transfer system; the Mo powder serves as a nucleus for Fe atoms dissolving from the container surface into the hot liquid metal and prevents the deposition of Fe on cold surfaces and consequent plugging of the system. A suitable Mo concentration is approximates 5 atoms per million atoms of Pb and/or Bi. (D.L.C.)
  • A process for reversibly transferring heat between a plurality of zones maintained at different temperature levels, and a heat transfer system useful therein. The technique involves maintaining a solution of a volatile material, e.g., a solution of a non-volatile inorganic salt in ammonia, in a solution tank, feeding the solution into an evaporator to evaporate the ammonia (or other volatile material), and feeding the ammonia vapor thus formed into a separate receiver which is in heat exchange relationship with a low temperature thermal sink, while recycling the solution having a decreased ammonia content to the solution tank. Heat is thusmore » transferred to a low temperature thermal sink, and the procedure is continued to store any desired quantity of thermal energy therein. When it is desired to withdraw heat from the system, the salt/ammonia solution, containing a decreased concentration of the ammonia, is fed into a condenser wherein ammonia vapor is absorbed and additional vapor is introduced by vaporization of ammonia in the receiver, thereby transferring heat from the low temperature thermal sink to the useful temperature level of the condenser. Thermal energy, which may be provided by solar insolation or other low grade heat sources, is thus transferred from the evaporator, stored in a low temperature thermal sink, and recovered from the condenser at useful temperatures. Use of a separate solution tank and receiver facilitates independent control of the instantaneous heat input and output in the evaporator and condenser, and the total thermal storage capacity in the receiver and thermal sink. Use of a working fluid incorporating a first, volatile material such as ammonia, and a second, relatively non-volatile material compatible therewith (such as sodium thiocyanate or other non-volatile inorganic salt) facilitates prolonged, efficient operation of the sequential thermal charging and discharge operations.« less
  • A heat pump for cooling or heating a conditioned space includes an underground heat pipe laid into a hole in the ground back-filled with soil. The heat transfer of the soil is improved by dispersing highly water-absorbent hydrophilic polymeric gel particles soaked with water around the heat pipe. The water-soaked particles preferably are coated with a water-impermeable film. The water may also be entrapped in liquid form in small bags. Also, a water impermeable sheath may be formed around the back-fill soil to minimize evaporation from the particles.
  • This patent discusses a heat transfer system, e.g., refrigeration system or heater, particularly valuable at cryogenic temperatures which comprises a serial arrangement, in abutting contact and connected to the material or device to be cooled or heated, of a thermal reservoir made of a material having a specific heat capacity, a thermal valve made of a thermally-conductive material whose thermal conductivity increases as its temperature increases, e.g., magnesium, a working material whose temperature is periodically varied, e.g., by magnetic or electric fields, and another valve of a thermal-conductive material whose thermal conductivity decreases as its temperature increases, e.g., NaCl. Themore » magnetic refrigeration or heater units may be ganged to increase the cooling or heating ability.« less
  • A heat pump is described for cooling or heating a conditioned space includes an underground heat pipe laid into a hole in the ground back-filled with soil. The heat transfer of the soil is improved by dispersing highly water-absorbent hydrophilic polymeric gel particles soaked with water around the heat pipe. The water-soaked particles preferably are coated with a water-impermeable film. The water may also be entrapped in liquid form in small bags. Also, a water impermeable sheath may be formed around the back-fill soil to minimize evaporation from the particles.