Patent GB-658993-A (GB)
Title: Improvements in space heating and cooling systems
IPC: F24F5/00
Filed: 1948-06-18
Abstract: 658,993. Heating and cooling buildings and vehicles; tubular heat-exchangers. VAPOR HEATING CORPORATION. June 18, 1948, No. 16471. Convention date, July 26, 1947. [Classes 64(ii) and 64(iii)] [Also in Group XXIX] In a system for alternatively heating or cooling a space such as a railway coach interior ,a pump E circulates a heat-conveying liquid in a loop conduit C including in series a device F for heating the liquid, a device G for cooling the liquid and a device such as an adjustable spring-loaded valve 26 for providing the loop with a high pressure delivery side 19 and a low pressure return side 21. Furthermore, at least one heat radiating and absorbing unit A, connected across the two sides of the loop, is located in the coach and either the heating or the cooling device is rendered inoperable, e.g. by stopping the circulation, of steam from the train pipe J and a supply pipe 63 through the heater F, or of coolant from a cooling circuit L through the cooler G. To reduce the pressure of the steam from the train pipe J, a valve structure 47 is included which is operated both by temperature and pressure of the steam. Steam is allowed to enter a chamber 50, Fig. 9 when the pressure therein falls below 40 lbs./sq. inch and flows from thence through a port 52 to the valve K (see Group XXIX) which, subject to the control of a thermal element M, Fig. 2 in the coach, allows steam to enter the supply pipe 63 of the heater F. When the steam from the inlet 52 rises to 15 lbs./sq. inch pressure, a valve 60 is opened thereby to permit the steam to contact a thermal bellows 56 which in expanding rocks a lever 54 to restrict the port 52. When the temperature outside the coach rises, a thermal element 61 causes energization of an electromagnet 62 which opens valve 60, to permit heating of the bellows 56 with consequent closure of the inlet 52 by a valve 53. The condensate from the heater F is returned to an outlet 65 from the bellows chamber to atmosphere but any steam returning rises into the chamber and actuates the bellows to close the valve 53. The thermal element M in the coach and a relay N control the steam valve K communicating with the reducing valve structure 47. A valve 119 and a pump 115 in the coolant circuit L are controlled by a thermal element O in the coach and a relay P. The radiator units A are separately supplied with liquid by way of electromagnetically actuated valves 17 (see Group XXIX) each controlled by a high temperature and a low temperature thermal element and relay located in the area of the coach served by the particular radiator unit. Thermal expansion of the liquid is taken up in a tank H and each unit A. comprises co-axial pipes the outer of which is finned and returns the liquid to an outlet pipe 20. The heater F and cooler G are similarly constructed, Figs. 7, 8. Each comprises a cylinder 30 and the liquid to be treated flows from an inlet 33 through a lowermost pipe 34 in the cylinder to a lower end chamber 35 and returns by way of three adjacent pipes 37 to a chamber at the inlet end from which it passes through two pipes 40 to the upper end chamber 42 before flowing out by way of the uppermost pipe 43. The steam or the cooling fluid enters and leaves the respective heat exchanger F or G by pipes 63, 64 or pipes 120, 116, and fills the spaces between the pipes in the casing 30.